KR102617452B1 - Motor rotor with cooling - Google Patents

Abstract

The present invention relates to a motor rotor having a cooling unit that can increase the efficiency of the rotor by cooling the rotating shaft. The cooling unit includes a cooling unit body forming the body, and the cooling unit body is spaced at equal intervals along the outer peripheral surface. It is arranged, and the inside and outside communicate with each other to form a motor cooling hole through which the fluid flowing into the rotating shaft is discharged.

Description

Motor rotor with cooling unit {MOTOR ROTOR WITH COOLING}

The present invention relates to a motor rotor, and more specifically, to a motor rotor provided with a cooling unit that can increase the efficiency of the rotor by cooling the rotating shaft.

In general, PM motors (PERMANENT MAGNET MOTORs) are divided into SURFACE MOUNTED PERMANENT MAGNET (SPM) motors and embedded permanent magnets (INTERIOR PERMANENT MAGNET) depending on the structure of the rotor, that is, where the permanent magnets are placed in the rotor. : Classified as IPM) motor.

That is, in SPM type motors, permanent magnets are placed on the surface of the rotor, and in IPM type motors, permanent magnets are placed inside the rotor.

On the other hand, IPM type motors have features such as easier fixation of permanent magnets during high-speed rotation compared to surface-attached permanent magnets, possible use of magnetic torque and reluctance torque in combination, and reduction of eddy current loss on the rotor surface. Torque and high efficiency are possible.

Additionally, the IPM type motor can reduce the number of parts by reducing the amount of magnets used, simplifying the magnet shape, and eliminating the anti-separation bind.

This IPM motor has a structure in which a magnet is embedded inside the rotor, and can utilize both reluctance torque due to magnetization of the rotor and magnet torque due to the magnet, so it is compact and can obtain high power.

As shown in FIG. 1, this IPM type motor is wound with a coil (not shown) that generates magnetism by electricity and has a plurality of slots 11 for embedding bar-shaped conductors along the circumference. It consists of a stator (10: STATOR) formed and a rotor (30) that is rotatably installed inside the stator (10) and rotates by mutual electromagnetic force with the stator (10).

At this time, the rotor 30 has a through hole 31 formed at the center through which the rotation shaft 40 passes.

In addition, a plurality of magnet installation parts (33: BARRIER) are formed at regular intervals between the through hole 31 and the slots 11, and a permanent magnet 50 is embedded in each magnet installation part 33.

The permanent magnet 50 is embedded in each magnet installation portion 33 and generates torque by interaction with the magnetic field generated from the coil wound around the stator 10.

That is, when current is applied to the coil, the rotor 30 is rotated by the interaction between the rotating magnetic field generated by the structure of the stator 10 and the induced current generated in the conductor.

When current is applied to the coil wound around the stator 10, the permanent magnet 50 generates a rotating magnetic field as the polarity of the coil changes sequentially, forming electromagnetic force in the rotor 30.

In addition, a rotational force is generated on the rotor 30 by a repulsive force generated when the polarity of the rotating magnetic field generated in the stator 10 and the polarity of the permanent magnet 50 are the same, and an attractive force generated when the polarity is different. This occurs.

Because of this, the rotor 30 rotates around the rotation axis 40.

At this time, when the rotor 30 rotates, heat is generated in the motor.

In the conventional case, the stator was cooled by cooling the housing in which the stator is accommodated, but it was difficult to cool the rotor.

Therefore, as the rotor was not cooled efficiently, the temperature of the rotor increased and the efficiency of the magnetic flux motor decreased.

Additionally, high heat was transmitted to the bearings that rotatably connect the stator and rotor, reducing the durability of the motor.

Therefore, when the temperature of the motor rises during continuous load operation and heat accumulates in the rotor, the efficiency of the motor is reduced due to eddy current loss on the surface of the rotor, and the life of the bearing, which has the greatest impact on the life of the motor, is reduced. There was a problem that the lifespan of the motor was reduced by causing thermal expansion of the rotating shaft.

The present invention is intended to solve the above-described problems, and its purpose is to provide a motor rotor equipped with a cooling unit that can efficiently cool the rotor to increase motor efficiency and improve the durability of the motor.

The motor rotor equipped with a cooling unit according to an embodiment of the present invention is rotatably accommodated in the inner space of the stator of the motor, has a longitudinal through hole in the center, and has a plurality of magnet installation parts along the circumference of the through hole. A rotor core penetrated in the longitudinal direction, a hollow rotating shaft that penetrates the through hole and is coupled to the rotor core, one side and the other of which communicate with each other so that fluid flows, is mounted on the magnet installation unit, and interacts with the stator. It includes a magnet that generates a rotational force in the rotor core through its action, wherein the rotation shaft is equipped with a core mounting portion in contact with the inner circumferential surface of the rotor core on the outer peripheral surface, and bearings formed on both sides of the core mounting portion and installed on the stator. a bearing mounting portion, a cooling portion formed between the core mounting portion and the bearing mounting portion; and a cooling portion formed between the core mounting portion and the bearing mounting portion, wherein the cooling portion includes a cooling portion body forming a body, wherein the cooling portion body is disposed at equal intervals along the outer peripheral surface, The inside and the outside communicate with each other to form a motor cooling hole through which fluid flowing into the rotating shaft is discharged.

The cooling unit further includes a core blocking unit formed between the cooling unit body and the rotor core in one direction of the rotor core to restrict excessive movement of the rotor core in one direction.

The outer diameter of the cooling part body is larger than the outer diameter of the bearing mounting part, and the inner diameter of the cooling part body is the same as the inner diameter of the bearing mounting part.

The motor cooling hole penetrates the cooling unit body in a tangential direction to communicate with the inside and outside of the cooling unit body.

The outer diameter of the core blocking portion is larger than the outer diameter of the core mounting portion.

An inlet through which fluid flows is formed on one side of the rotating shaft, and an outlet through which fluid flowing in from the inlet is discharged is formed on the other side, and the inner diameter of the inlet is larger than the inner diameter of the outlet.

The inner diameter of the motor cooling hole is smaller than the inner diameter of the outlet.

In the core mounting portion, core cooling holes are formed that are disposed at equal intervals along the outer peripheral surface, the inside and outside of which communicate with each other, and through which the fluid flowing into the rotation shaft is discharged.

The core cooling hole penetrates the core mounting portion in the radial direction, and the inside and outside communicate with each other.

In the bearing mounting portion, bearing cooling holes are formed, which are disposed at equal intervals along the outer circumferential surface and communicate with each other inside and outside, through which fluid flowing into the rotating shaft is discharged.

The bearing cooling hole penetrates the bearing mounting portion in the radial direction to communicate with the inside and outside of the bearing mounting portion.

The cross-sectional shape of the magnet is the same as the cross-sectional shape of the magnet installation part.

The motor rotor equipped with coolant according to the present invention has an inlet through which fluid flows in on one side of the rotating shaft, and an outlet through which fluid flowing in from the inlet is discharged on the other side, so that fluid flows from the outside of the rotating shaft to the inside of the rotating shaft. It flows in smoothly, which has the effect of easily cooling the rotating shaft.

And, when the rotor core is mounted on the rotating shaft, the outer peripheral surface of the core mounting portion and the inner peripheral surface of the rotor core come into contact with each other, so that the fluid flowing into the rotating shaft is discharged to the outside of the core mounting portion through the core cooling hole of the core mounting portion. This has the effect of easily cooling the heat generated from the rotor core by contacting the inner peripheral surface of the rotor core.

In addition, when a bearing is mounted on a rotating shaft, the outer peripheral surface of the bearing mounting portion and the inner peripheral surface of the bearing come into contact with each other, so that the fluid flowing into the rotating shaft is discharged to the outside of the bearing mounting portion through the bearing cooling hole of the bearing mounting portion, thereby forming the rotor core and the rotor core. When the rotating shaft rotates, the bearing mounted on the stator also rotates, which has the effect of easily cooling the heat generated in the bearing.

This has the effect of improving the durability of the motor by cooling the high heat of the bearing that rotatably connects the stator and the rotor to each other.

In addition, when the motor cooling hole penetrates in the tangential direction of the cooling unit body and the fluid flowing into the inside of the rotating shaft is discharged through the motor cooling hole, the fluid comes into contact with the inside of the motor evenly in the circumferential direction, thereby dissipating the fluid from the cooling unit. It is discharged in the distal direction, which has the effect of cooling the motor more efficiently.

In addition, the motor cooling hole penetrates the cooling unit body in the tangential direction, so when the fluid flowing into the cooling unit body is discharged to the outside of the cooling unit body through the motor cooling hole, the rotational force of the motor is generated by the discharge pressure of the fluid. There is an effect that can further increase.

In addition, the outer diameter of the cooling unit body is smaller than the outer diameter of the bearing mounting portion, and the inner diameter of the cooling portion body is the same as the inner diameter of the bearing mounting portion, so that the cross-sectional thickness from the inner peripheral surface of the cooling portion body to the outer peripheral surface is the cross-sectional thickness from the inner peripheral surface to the outer peripheral surface of the bearing mounting portion. By being formed thicker, the fluid discharged through the motor cooling hole is discharged in a clearer direction, and in the process of passing the fluid through the motor cooling hole, a stronger driving force is generated compared to the bearing cooling hole, increasing the discharge pressure of the fluid. It has a growing effect.

As a result, the rotational force of the motor can be further accelerated by the discharged pressure of the fluid, and the load on the motor can be reduced more efficiently during continuous load operation, which has the effect of lowering the temperature of the motor more efficiently.

In addition, as the inner diameter of the motor cooling hole is made smaller than the inner diameter of the outlet of the rotating shaft, the discharge pressure of the fluid discharged from the rotating shaft becomes higher than the pressure of the fluid flowing into the inlet of the rotating shaft, and the direction of the fluid discharged through the motor cooling hole becomes more intense. It is discharged in a clear direction, and as the fluid passes through the motor cooling hole, it generates a stronger driving force, which has the effect of further accelerating the rotational force of the motor.

In addition, since the outer diameter of the core blocking portion is larger than the outer diameter of the core mounting portion, when the rotor core is mounted on the core mounting portion, one side of the rotor core is in contact with the other side of the core blocking portion, causing the rotor core to be tilted excessively in one direction. It has the effect of effectively limiting movement.

1 is a schematic diagram showing a rotor for a motor according to the prior art.
Figure 2 is a perspective view showing a motor rotor equipped with coolant according to an embodiment of the present invention.
Figure 3 is a cross-sectional view taken along line A-A' shown in Figure 2.
Figure 4 is an exploded perspective view of the motor rotor provided with coolant shown in Figure 2.
Figure 5 is a cross-sectional view of the motor rotor showing the cross-sectional structure of the core mounting portion.
Figure 6 is a cross-sectional view of the motor rotor showing the cross-sectional structure of the bearing mounting portion.
Figure 7 is a cross-sectional view of the motor rotor showing the cross-sectional structure of the cooling unit.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the invention is defined by the claims. Meanwhile, the terms used in this specification are for describing embodiments and are not intended to limit the present invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprises” or “comprising” means the presence or presence of one or more other components, steps, operations and/or elements other than the mentioned elements, steps, operations and/or elements. Addition is not ruled out.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 2 is a perspective view showing a motor rotor equipped with coolant according to an embodiment of the present invention, Figure 3 is a cross-sectional view taken along A-A' shown in Figure 2, and Figure 4 shows the coolant shown in Figure 2. It is an exploded perspective view of the motor rotor provided, Figure 5 is a cross-sectional view of the motor rotor showing the cross-sectional structure of the core mounting part, Figure 6 is a cross-sectional view of the motor rotor showing the cross-sectional structure of the bearing mounting part, Figure 7 is a cross-sectional view of the motor rotor to show the cross-sectional structure of the cooling unit.

2 to 7, the motor rotor with a cooling unit according to this embodiment includes a rotor core 100, a rotating shaft 200, and a magnet 300.

The rotor core 100 is rotatably accommodated in the space inside the IPM (INTERIOR PERMANENT MAGNET) type motor stator.

The rotor core 100 is described as being applied to an IPM type motor as an example, but it can be applied to all electric drive devices, motors, starter generators, etc. that are used for eco-friendly automobiles and require large torque.

This rotor core 100 consists of a core body 110, a through hole 120, and a magnet installation portion 130.

The core body 110 is formed in a cylindrical shape, is placed inside a stator on which a coil is mounted, and rotates with respect to the stator.

Since the core body 110 is formed in a cylindrical shape, the core body 110 rotates stably inside the stator due to the nature of the shape.

The through hole 120 is penetrated in the longitudinal direction from the center of the core body 110, and the rotation axis 200 fixed to the stator passes through it.

A through hole 120 is formed in the center of the core body 110, and the rotation axis 200 passes through it, so that the core body 110 rotates smoothly with respect to the stator around the rotation axis 200.

A plurality of magnet installation parts 130 are spaced apart from each other along the circumference of the through hole 120 and penetrated in the longitudinal direction. One end and the other end of the core body 110 communicate with each other to form a magnet 300. This is installed.

The magnet installation part 130 is filled with air to reduce leakage of magnetic flux generated from the magnet 300.

By forming the magnet installation portion 130 in the core body 110, the magnet 300 can be easily embedded in the core body 110.

The rotating shaft 200 passes through the through hole 120 of the rotor core 100 and is coupled to the rotor core 100, and the rotating shaft 200 rotates together with the rotor core 100.

In addition, one end and the other end of the rotation shaft 200 are respectively fixed to the inside of the stator. As a result, the rotor core 100 can be easily fixed to the inside of the stator via the rotor shaft.

The rotating shaft 200 is formed as a hollow shaft through which fluid flows with one side and the other side communicating with each other. An inlet 240 through which fluid flows is formed on one side of the rotating shaft 200, and an inlet 240 through which fluid flows is formed on the other side of the rotating shaft 200. An outlet 250 is formed through which the introduced fluid is discharged.

Due to this, fluid flows smoothly from the outside of the rotating shaft 200 into the inside of the rotating shaft 200, making it possible to easily cool the rotating shaft 200.

This rotating shaft 200 consists of a core mounting portion 210, a bearing mounting portion 220, and a cooling portion 230.

The core mounting portion 210 forms the body of the rotating shaft 200, and a core cooling hole 211 is formed on the outer peripheral surface.

A plurality of core cooling holes 211 are arranged at equal intervals along the outer peripheral surface of the core mounting portion 210, and penetrate the core mounting portion 210 in the radial direction to communicate with the inside and outside of the core mounting portion 210.

Because of this, the core cooling hole 211 can discharge the fluid that flows into the inlet 240 of the rotating shaft 200 before it is discharged through the outlet 250 of the rotating shaft 200.

Meanwhile, when the rotor core 100 is mounted on the rotating shaft 200, the outer peripheral surface of the core mounting portion 210 and the inner peripheral surface of the rotor core 100 contact each other.

As a result, the fluid flowing into the rotating shaft 200 is discharged to the outside of the core mounting portion 210 through the core cooling hole 211 of the core mounting portion 210 and comes into contact with the inner peripheral surface of the rotor core 100, thereby rotating the rotor. Heat generated from the core 100 can be easily cooled.

The bearing mounting portion 220 is formed on both sides of the core mounting portion 210 and is equipped with a bearing 400 installed on the stator.

This bearing mounting portion 220 has a bearing cooling hole 221 formed on its outer peripheral surface.

A plurality of bearing cooling holes 221 are arranged at equal intervals along the outer peripheral surface of the bearing mounting portion 220, and penetrate in the radial direction of the bearing mounting portion 220 to communicate with the inside and outside of the bearing mounting portion 220. .

Due to this, the bearing cooling hole 221 can discharge the fluid flowing into the inlet 240 of the rotating shaft 200 before the fluid is discharged through the outlet 250 of the rotating shaft 200.

Meanwhile, when the bearing 400 is mounted on the rotating shaft 200, the outer peripheral surface of the bearing mounting portion 220 and the inner peripheral surface of the bearing 400 contact each other.

Accordingly, the fluid flowing into the rotary shaft 200 is discharged to the outside of the bearing mounting portion 220 through the bearing cooling hole 221 of the bearing mounting portion 220, thereby causing the rotor core 100 and the rotating shaft 200 to When rotating, the bearing 400 mounted on the stator also rotates, allowing the heat generated in the bearing 400 to be easily cooled.

As a result, the temperature of the bearing cooling hole 221 increases during continuous load operation, causing heat to accumulate in the rotor, which reduces the efficiency of the motor due to eddy current loss on the surface of the rotor and has the greatest impact on the life of the motor. It is possible to prevent the lifespan of the bearing 400 from being reduced.

In addition, the durability of the motor can be improved by cooling the high heat of the bearing 400 that rotatably connects the stator and the rotor to each other.

The cooling part 230 is formed between the core mounting part 210 and the bearing mounting part 220, and this cooling part 230 consists of a cooling part body 231 and a core blocking part 233.

The cooling unit body 231 forms the body of the cooling unit 230, and a motor cooling hole 232 is formed on its outer peripheral surface.

A plurality of motor cooling holes 232 are arranged at equal intervals along the outer peripheral surface of the cooling unit body 231. As shown in FIG. 7, the motor cooling holes 232 penetrate in the tangential direction of the cooling unit body 231 and form the cooling unit body 231. ) communicates with each other the inside and outside.

Accordingly, the motor cooling hole 232 can discharge the fluid flowing into the inlet 240 of the rotating shaft 200 before the fluid is discharged through the outlet 250 of the rotating shaft 200.

That is, unlike the conventional method in which the stator was cooled by cooling the housing in which the stator is accommodated, but it was difficult to cool the rotor, in one embodiment of the present invention, the cooling unit 231 of the rotor is cooled to the inside of the rotating shaft 200. By forming the motor cooling hole 232 through which the introduced fluid is discharged, the fluid can be discharged through the motor cooling hole 232 of the cooling unit body 231 to efficiently cool the rotor.

As a result, the rotor is efficiently cooled, effectively lowering the temperature of the rotor, and increasing the efficiency of the magnetic flux motor.

Meanwhile, a core cooling hole 211 is formed in the radial direction of the core mounting portion 210 to allow fluid to contact the inner surface of the rotor core 100, and is formed in the radial direction of the bearing mounting portion 220 to allow fluid to flow into the bearing. Unlike the bearing mounting portion 220 that is in contact with the inner surface of (400), the motor cooling hole 232 penetrates in the tangential direction of the cooling unit body 231, so that the fluid flowing into the inside of the rotating shaft 200 flows into the motor. When discharged through the cooling hole 232, the fluid evenly contacts the inside of the motor in the circumferential direction.

Therefore, the motor cooling hole 232 can cool the motor more efficiently by discharging fluid from the cooling unit 230 in the distal direction.

In addition, the motor cooling hole 232 is penetrated in the tangential direction of the cooling unit body 231, so that the fluid flowing into the cooling unit body 231 flows to the outside of the cooling unit body 231 through the motor cooling hole 232. When discharged, the rotational power of the motor can be further increased by the discharged pressure of the fluid.

Meanwhile, the outer diameter of the cooling part body 231 is smaller than the outer diameter of the bearing mounting part 220, and the inner diameter of the cooling part body 231 is the same as the inner diameter of the bearing mounting part 220.

That is, the cross-sectional thickness (D2) from the inner peripheral surface to the outer peripheral surface of the cooling unit body 231 is formed thicker than the cross-sectional thickness (D1) from the inner peripheral surface to the outer peripheral surface of the bearing mounting portion 220, thereby increasing the length of the motor cooling hole 232. It is longer than the length of the bearing cooling hole (221).

Therefore, the fluid discharged through the motor cooling hole 232 is discharged in a clearer direction, and a stronger driving force is generated in the process of the fluid passing through the motor cooling hole 232 compared to the bearing cooling hole 221. The discharge pressure of the fluid increases further.

As a result, the rotational force of the motor can be further accelerated by the discharged pressure of the fluid, and the load on the motor can be reduced more efficiently during continuous load operation, thereby lowering the temperature of the motor more efficiently.

Meanwhile, the inner diameter of the inlet 240 of the rotating shaft 200 is larger than the inner diameter of the outlet 250 of the rotating shaft 200.

Accordingly, when the fluid flowing into the rotating shaft 200 is discharged to the outside of the rotating shaft 200 through the motor cooling hole 232, it is discharged with greater pressure.

In addition, it is preferable that the inner diameter of the motor cooling hole 232 is smaller than the inner diameter of the outlet 250 of the rotating shaft 200.

Accordingly, the discharge pressure of the fluid discharged from the rotating shaft 200 becomes higher than the pressure of the fluid flowing into the inlet 240 of the rotating shaft 200.

As a result, the direction of the fluid discharged through the motor cooling hole 232 is discharged in a clearer direction, and a stronger driving force is generated in the process of the fluid passing through the motor cooling hole 232, further accelerating the rotational force of the motor. You can.

The size of the motor cooling hole 232 and the size of the inlet 240 and outlet 250 of the rotating shaft 200 are such that the pressure of the fluid discharged from the motor cooling hole 232 is lowered from the inlet 240 of the rotating shaft 200. If it is greater than the incoming pressure, it can be formed in various sizes depending on the product specifications and usage environment.

The core blocking portion 233 is formed between the cooling unit body 231 and the rotor core 100 in one direction of the rotor core 100, and connects the rotor core 100 to the other side of the core mounting portion 210. When mounted in one direction from the rotor core 100, excessive movement in one direction of the core mounting portion 210 is restricted.

The outer diameter of the core blocking portion 233 is larger than the outer diameter of the core mounting portion 210.

Therefore, when the rotor core 100 is mounted on the core mounting portion 210, one side of the rotor core 100 is in contact with the other side of the core blocking portion 233, so that the rotor core 100 moves in one direction. Excessive movement can be effectively limited.

The magnet 300 may also be made of a permanent magnet 300 depending on the product specifications and usage environment.

The magnet 300 can generate a stable magnetic field without receiving electrical energy from the outside, thereby stably rotating the rotor.

The magnets 300 are installed in each of the magnet installation units 130, and for this purpose, the cross-sectional shape of the magnets 300 is the same as the cross-sectional shape of the magnet installation unit 130.

And, the magnet 300 generates a rotational force in the rotor core 100 by interaction with the magnetic field generated from the coil mounted on the stator.

When current is applied to the coil, the rotor rotates due to the interaction between the rotating magnetic field generated by the structure of the stator and the induced current generated in the conductor, and when the rotor reaches synchronous speed, the torque and rotation by the magnet 300 RELUCTANCE TORQUE is generated due to the structure of electrons, causing the rotor to rotate and generate torque.

As described above, the motor rotor equipped with the cooling unit 230 according to the present invention has an inlet 240 through which fluid flows in on one side of the rotating shaft 200, and an inlet 240 through which fluid flows in from the inlet 240 on the other side. By forming the outlet 250 through which fluid is discharged, fluid can smoothly flow from the outside of the rotating shaft 200 into the inside of the rotating shaft 200, thereby easily cooling the rotating shaft 200.

And, when the rotor core 100 is mounted on the rotating shaft 200, the outer peripheral surface of the core mounting portion 210 and the inner peripheral surface of the rotor core 100 come into contact with each other, so that the fluid flowing into the rotating shaft 200 The heat generated from the rotor core 100 can be easily cooled by being discharged to the outside of the core mounting portion 210 through the core cooling hole 211 of the core mounting portion 210 and in contact with the inner peripheral surface of the rotor core 100. there is.

In addition, when the bearing 400 is mounted on the rotating shaft 200, the outer peripheral surface of the bearing mounting portion 220 and the inner peripheral surface of the bearing 400 come into contact with each other, so that the fluid flowing into the rotating shaft 200 flows into the bearing mounting portion 220. ) is discharged to the outside of the bearing mounting portion 220 through the bearing cooling hole 221, and when the rotor core 100 and the rotating shaft 200 rotate, the bearing 400 mounted on the stator also rotates. The heat of (400) can be easily cooled.

As a result, the durability of the motor can be improved by cooling the high heat of the bearing 400 that rotatably connects the stator and the rotor to each other.

In addition, when the motor cooling hole 232 penetrates in the tangential direction of the cooling unit body 231 and the fluid flowing into the rotary shaft 200 is discharged through the motor cooling hole 232, the fluid flows through the inside of the motor. By being evenly contacted in the circumferential direction, the fluid can be discharged from the cooling unit 230 in the distal direction, thereby cooling the motor more efficiently.

In addition, as the motor cooling hole 232 penetrates the cooling unit body 231 in the tangential direction, the fluid flowing into the cooling unit body 231 flows to the outside of the cooling unit body 231 through the motor cooling hole 232. When discharged, the rotational power of the motor can be further increased by the discharged pressure of the fluid.

In addition, the outer diameter of the cooling unit body 231 is smaller than the outer diameter of the bearing mounting portion 220, and the inner diameter of the cooling portion body 231 is the same as the inner diameter of the bearing mounting portion 220, so that the outer circumferential surface is from the inner peripheral surface of the cooling portion body 231. As the cross-sectional thickness (D2) is thicker than the cross-sectional thickness (D1) from the inner peripheral surface to the outer peripheral surface of the bearing mounting portion 220, the fluid discharged through the motor cooling hole 232 is discharged in a more clear direction, As the fluid passes through the motor cooling hole 232, a stronger driving force is generated compared to the bearing cooling hole 221, thereby further increasing the discharge pressure of the fluid.

As a result, the rotational force of the motor can be further accelerated by the discharged pressure of the fluid, and the load on the motor can be reduced more efficiently during continuous load operation, thereby lowering the temperature of the motor more efficiently.

In addition, the inner diameter of the motor cooling hole 232 is formed to be smaller than the inner diameter of the outlet 250 of the rotating shaft 200, so that the pressure of the fluid flowing into the inlet 240 of the rotating shaft 200 is higher than that of the fluid discharged from the rotating shaft 200. As the discharge pressure increases, the fluid discharged through the motor cooling hole 232 is discharged in a clearer direction, and as the fluid passes through the motor cooling hole 232, a stronger driving force is generated, increasing the rotational power of the motor. It can be accelerated further.

In addition, since the outer diameter of the core blocking portion 233 is larger than the outer diameter of the core mounting portion 210, when the rotor core 100 is mounted on the core mounting portion 210, one side of the rotor core 100 is By contacting the other side of the blocking portion 233, excessive movement of the rotor core 100 in one direction can be effectively restricted.

The present invention is not limited to the above-described embodiments, and can be implemented with various modifications within the scope permitted by the technical idea of the present invention.

100: rotor core 110: core body
120: Through hole 130: Magnet installation part
200: Rotating shaft 210: Core mounting portion
211: Core cooling hole 220: Bearing mounting part
221: Bearing cooling hole 230: Cooling unit
231: Cooling unit body 232: Motor cooling hole
233: core blocking part 240: inlet
250: outlet 300: magnet
400: Bearing

Claims (12)

A rotor core rotatably accommodated in the inner space of the stator of the motor, having a longitudinal through hole in the center, and having a plurality of magnet installation portions longitudinally penetrating along the circumference of the through hole.
a hollow rotating shaft that passes through the through hole and is coupled to the rotor core, with one side and the other side communicating with each other through which fluid flows;
A magnet is mounted on the magnet installation unit and generates a rotational force in the rotor core through interaction with the stator,
The rotation axis is,
A core mounting portion where the inner peripheral surface of the rotor core contacts the outer peripheral surface;
Bearing mounting portions formed on both sides of the core mounting portion to which bearings installed on the stator are mounted;
It includes a cooling portion formed between the core mounting portion and the bearing mounting portion,
The cooling unit,
Including a cooling body forming the body,
A motor cooling hole is formed in the cooling unit body at equal intervals along the outer circumferential surface, the inside and outside of which communicate with each other, and the fluid flowing into the rotation shaft is discharged,
The outer diameter of the cooling part body is larger than the outer diameter of the bearing mounting part, and the inner diameter of the cooling part body is the same as the inner diameter of the bearing mounting part,
The motor cooling hole is,
Penetrating the cooling unit body in a tangential direction to communicate with the inside and outside of the cooling unit body,
In the bearing mounting part,
A bearing cooling hole is formed that is disposed at equal intervals along the outer circumferential surface, the inside and the outside communicate with each other, and the fluid flowing into the rotating shaft is discharged,
The length of the motor cooling hole is longer than the length of the bearing cooling hole.
A motor rotor with a phosphor cooling unit.
The method of claim 1, wherein the cooling unit,
It further includes a core blocking portion formed between the cooling unit body and the rotor core, and contacting one surface of the rotor core to restrict excessive movement of the rotor core in the direction of one surface.
A motor rotor with a phosphor cooling unit.
delete delete According to paragraph 2,
The outer diameter of the core blocking portion is larger than the outer diameter of the core mounting portion.
A motor rotor with a phosphor cooling unit.
According to paragraph 1,
An inlet through which fluid flows in is formed on one side of the rotating shaft, and an outlet through which fluid flowing in from the inlet is discharged is formed on the other side,
The inner diameter of the inlet is larger than the inner diameter of the outlet.
A motor rotor with a phosphor cooling unit.
According to clause 6,
The inner diameter of the motor cooling hole is smaller than the inner diameter of the outlet.
A motor rotor with a phosphor cooling unit.
The method of claim 1, wherein the core mounting portion includes:
A core cooling hole is formed at equal intervals along the outer circumferential surface, and the inside and outside communicate with each other, and the fluid flowing into the rotating shaft is discharged.
A motor rotor with a phosphor cooling unit.
The method of claim 8, wherein the core cooling hole is,
Penetrating the core mounting part in the radial direction, the inside and outside communicate with each other
A motor rotor with a phosphor cooling unit.
delete The method of claim 1, wherein the bearing cooling hole is,
Penetrating the bearing mounting portion in the radial direction to communicate with the inside and outside of the bearing mounting portion.
A motor rotor with a phosphor cooling unit.
The method of claim 1, wherein the cross-sectional shape of the magnet is:
Same as the cross-sectional shape of the magnet installation part
A motor rotor with a phosphor cooling unit.

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