CN108736630B - Motor with heat radiation structure - Google Patents
Motor with heat radiation structure Download PDFInfo
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- CN108736630B CN108736630B CN201810699704.0A CN201810699704A CN108736630B CN 108736630 B CN108736630 B CN 108736630B CN 201810699704 A CN201810699704 A CN 201810699704A CN 108736630 B CN108736630 B CN 108736630B
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- motor
- stator core
- heat dissipation
- heat
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses a motor with a heat dissipation structure, which comprises a rotor and a stator core, wherein the rotor penetrates through the stator core, the rotor rotates in the stator core, a plurality of windings are arranged in the stator core, and heat dissipation fins are arranged between adjacent windings. According to the motor with the heat dissipation structure, the heat dissipation efficiency of the motor is improved by additionally arranging the heat dissipation fins, the current of the motor in normal operation is increased, and the power of the motor is further improved; through holes are additionally formed in the radiating fins, so that air or coolant flows from the through holes, the contact area between the radiating fins and the air or the coolant is increased, and the radiating effect of the radiating fins is improved; the limiting piece is additionally arranged, so that the radiating fin is clamped on the inner side wall of the stator core, and the radiating fin is prevented from shifting when the motor runs, and the uneven heat radiation is avoided; in addition, the insulating layer is additionally arranged, so that the heat of the radiating fin caused by the circulation of current on the radiating fin is prevented, and the short circuit is effectively prevented.
Description
Technical Field
The invention relates to the field of motors, in particular to a motor with a heat dissipation structure.
Background
The prior art generally adopts the aluminum shell that has the circulation water course in adopting outside the iron core external diameter of motor, like this, the heat that produces on the wire winding is conducted on the stator core iron core by the wire winding, is conducted on the aluminum shell by the iron core, and the circulating water in the aluminum shell is again brought out the heat, and the external radiator of circulating water to adopt the water pump to let water at motor housing and radiator mesocycle, give off the heat in the motor wire winding in the outside air via the radiator.
In the above heat dissipation manner, heat on the winding is transferred to the housing through the iron core and is finally dissipated into the circulating water, wherein the heat conductivity coefficient of the silicon steel made of the iron core material is 20W/(m × K), and the heat conductivity coefficient of the aluminum shell is 237W/(m × K), so that the heat dissipation efficiency of the motor is low, and therefore, in the operation process of the motor, the current of the motor must be limited, and further, the power of the motor is limited.
Disclosure of Invention
The invention mainly aims to provide a motor with a heat dissipation structure, and the technical problem of improving the heat dissipation efficiency of the motor is solved.
The invention provides a motor with a heat dissipation structure, which comprises a rotor and a stator core, wherein the rotor penetrates through the stator core and rotates in the stator core, a plurality of windings are arranged in the stator core, and heat dissipation fins are arranged between the adjacent windings.
Further, in the motor having the heat dissipation structure, the heat sink is provided with through holes penetrating through both ends thereof for forming air convection or guiding a coolant.
Furthermore, in the motor with the heat dissipation structure, the inner side wall of the through hole is fixedly provided with a plurality of shunt pieces.
Further, in the motor with the heat dissipation structure, the heat dissipation plate includes a limiting member and a flow guiding member, the flow guiding member is fixedly connected to the stator core through the limiting member, and the width of the flow guiding member is smaller than the width corresponding to the limiting member, and the flow guiding member is provided with the through hole.
Further, in the motor with the heat dissipation structure, the position limiting member is a cylinder, a heat dissipation sheet installation groove is formed between adjacent windings, the position limiting member is fixedly connected with the installation groove, and the shape and the size of the installation groove are matched with those of the position limiting member.
Further, in the motor with the heat dissipation structure, the position limiting member is provided with a notch, the side wall of the flow guide member is fixedly connected with the notch, and the shape and the size of the connection part of the flow guide member and the notch are matched with those of the notch.
Further, in the motor with the heat dissipation structure, the flow guide member is a rectangular parallelepiped.
Further, above-mentioned motor with heat radiation structure still includes the insulating layer, and above-mentioned insulating layer cladding has above-mentioned winding.
Further, the motor with the heat dissipation structure further comprises a heat conduction layer, and the heat conduction layer is filled between the adjacent windings.
Further, the motor with the heat dissipation structure further comprises a motor housing, wherein the inner side wall of the motor housing is fixedly connected with the outer side wall of the stator core, and the rotating shaft of the rotor is fixedly connected with the motor housing through a bearing.
According to the motor with the heat dissipation structure, the heat dissipation efficiency of the motor is improved by additionally arranging the heat dissipation fins, the current of the motor in normal operation is increased, and the power of the motor is further improved; through holes are additionally formed in the radiating fins, so that air or coolant flows from the through holes, the contact area between the radiating fins and the air or the coolant is increased, and the radiating effect of the radiating fins is improved; the limiting piece is additionally arranged, so that the radiating fins are clamped on the inner side wall of the stator core, the radiating fins are prevented from shifting when the motor runs, uneven heat radiation is prevented, and meanwhile, the radiating fins are prevented from sliding to the rotor along the radial direction and touching the rotor, so that the radiating fins or the rotor are prevented from being damaged; in addition, the insulating layer is additionally arranged, so that the heat of the radiating fin caused by the circulation of current on the radiating fin is prevented, and the short circuit is effectively prevented; moreover, the heat conducting layer is additionally arranged, so that the heat of the winding is uniformly transferred to the radiating fin, and the radiating effect of the radiating fin is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a motor with a heat dissipation structure according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a heat sink in accordance with an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a flow guiding device according to an embodiment of the present invention;
fig. 4 is a schematic structural view of the heat sink, the stator core, and the winding wire according to an embodiment of the present invention.
1. A rotor; 2. a stator core; 3. a winding; 4. a heat sink; 5. a flow guide device; 6. a through hole; 7. an end-circulation upper shell; 8. an end-circulation lower shell; 9. connecting holes; 10. a liquid guide port; 11. a liquid guide groove; 12. a base; 13. a first raised circular ring; 14. a second raised circular ring; 15. a third raised circular ring; 16. an inner annular liquid guide groove; 17. an outer annular liquid guide groove; 18. a limiting member; 19. a flow guide member; 20. and a motor housing.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly, and the connection may be a direct connection or an indirect connection.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a motor with a heat dissipation structure, including a rotor 1 and a stator core 2, wherein the rotor 1 is inserted into the stator core 2, and the rotor 1 rotates in the stator core 2, the stator core 2 is provided with a plurality of windings 3, the plurality of windings 3 are supplied with three-phase ac power to generate a rotating magnetic field, permanent magnetic steel on the rotor 1 rotates due to the rotating magnetic field generated by the stator core 2, the motor includes a heat sink 4 and a flow guiding device 5, the heat sink 4 is provided between adjacent windings 3, the heat sink 4 is provided with through holes 6 penetrating through two ends for guiding a coolant, the cooling efficiency of the heat sink 4 is improved by the coolant, the flow guiding device 5 is sleeved on the rotor 1 and fixedly connected to the stator core 2, the flow guiding device 5 includes two, and are respectively sleeved on the top end and the bottom end of the radiating fin 4 and communicated with the through hole 6, so that the coolant flows into the through holes 6 of a plurality of radiating fins 4 from the flow guide device 5 connected with one end of the radiating fin 4 uniformly, then flows into the flow guide device 5 connected with the other end of the radiating fin 4 from the through hole 6, the coolant flows into the flow guide device 5 after being cooled, the coolant flows into the through hole 6 of the radiating fin 4 uniformly under the condition of reducing a liquid inlet pipeline, the heat dissipation effect of each radiating fin 4 on each group of windings 3 is the same, in the running process of the motor, the windings 3 generate certain heat due to self resistance, the radiating fins 4 and the coolant absorb and dissipate the heat, the temperature of the windings 3 is reduced, and the resistance generated by the windings 3 due to heating is reduced, thereby increasing the current of the winding 3 and thus increasing the power density of the motor, wherein the coolant may be a mixed coolant, water or a condensing agent such as tetrafluoroethane.
In an embodiment of the present invention, the flow guiding device 5 includes an end circulation upper housing 7 and an end circulation lower housing 8, the end circulation lower housing 8 is hermetically connected to the end circulation upper housing 7 to prevent the coolant from overflowing from between the end circulation upper housing 7 and the end circulation lower housing 8, the end circulation lower housing 8 is provided with connection holes 9, the number of the connection holes 9 is equal to the number of the heat dissipation fins 4, each of the connection holes 9 is connected to one of the heat dissipation fins 4, the end circulation upper housing 7 is provided with a liquid guiding port 10, a liquid guiding groove 11 communicating the connection hole 9 and the liquid guiding port 10 is provided in the end circulation upper housing 7, the connection hole 9 is hermetically connected to the heat dissipation fin 4, and the through hole 6 is communicated with the liquid guiding groove 11 to allow the coolant to pass through the liquid guiding groove 11 from the liquid guiding port 10, The connection holes 9 flow into the through holes 6 of the heat radiating fins 4, and the coolant flows uniformly into the through holes 6 of the heat radiating fins 4 with a reduced number of liquid inlet passages, so that the heat radiating effect of each of the heat radiating fins 4 on each of the sets of the windings 3 is the same.
In an embodiment of the present invention, the upper end circulation housing 7 includes a base 12, a first raised ring 13, a second raised ring 14, and a third raised ring 15, the first raised ring 13, the second raised ring 14, and the third raised ring 15 are sequentially concentrically sleeved and fixedly connected to the bottom wall of the base 12 to form the liquid guiding groove 11, the third raised ring 15 is provided with the liquid guiding port 10, the liquid guiding groove 11 includes an inner annular liquid guiding groove 16 and an outer annular liquid guiding groove 17, the first raised ring 13 and the second raised ring 14 form the inner annular liquid guiding groove 16, the size of each part of the inner annular liquid guiding groove 16 is the same, the pressure of the coolant at each part in the inner annular liquid guiding groove 16 is the same, the coolant uniformly flows into the through holes 6 of the heat dissipating fins 4 or the coolant flowing out from the through holes 6 uniformly enters the inner annular liquid guiding groove 16, the second raised ring 14 and the third raised ring 15 form the outer annular liquid guiding groove 17, the size of each position of the outer annular liquid guiding groove 17 is made the same, the pressure of the coolant entering the outer annular liquid guiding groove 17 from the liquid guiding opening 10 is made equal, or the pressure of the coolant entering the outer annular liquid guiding groove 17 from the inner annular liquid guiding groove 16 is made equal, and a plurality of the connecting holes 9 are provided at the positions of the end circulation upper housing 7 corresponding to the inner annular liquid guiding groove 16, the through hole 6 is communicated with the liquid guiding opening 10 through the inner annular liquid guiding groove 16 and the outer annular liquid guiding groove 17, thereby the coolant is circulated between each through hole 6 and the liquid guiding opening 10, each cooling fin 4 is filled with the coolant uniformly, and the cooling fin 4 and the coolant absorb and dissipate heat, the temperature of the winding 3 is lowered, the resistance of the winding 3 due to heat generation is lowered, the current of the winding 3 is increased, the power density of the motor is improved, and the heat dissipation effect of each heat dissipation fin 4 on each group of the winding 3 is the same.
In an embodiment of the present invention, the bottom walls of the first raised circular ring 13, the second raised circular ring 14 and the third raised circular ring 15 are respectively and hermetically connected to the top wall of the end circulation lower housing 8, and the second raised circular ring 14 is provided with a notch, the second raised circular ring 14 and the third raised circular ring 15 are connected by a barrier, so as to prevent the coolant from overflowing from the first raised circular ring 13 and the third raised circular ring 15 into the interior of the motor, damage the internal components of the motor, and limit the coolant from the inner annular liquid guiding groove 16 to enter the outer annular liquid guiding groove 17 only through the notch, or limit the coolant from the outer annular liquid guiding groove 17 to enter the inner annular liquid guiding groove 16 only through the notch, so that the coolant forms a certain flowing direction when flowing in the outer annular liquid guiding groove 17, thereby uniformly filling the through holes 6 of each of the cooling fins 4 with the coolant, the heat dissipation fins 4 and the coolant absorb and dissipate heat, thereby reducing the temperature of the winding 3, reducing the resistance of the winding 3 due to heat generation, increasing the current of the winding 3, further improving the power density of the motor, and enabling the heat dissipation effect of each heat dissipation fin 4 to be the same for each group of the winding 3.
In an embodiment of the present invention, the material of the end-cycle upper case 7 is aluminum, the material of the end-cycle lower case 8 is aluminum or copper, and the end-cycle lower case 8 is tightly attached to the winding end and needs to perform the function of dissipating heat of the winding 3, so that the cost of aluminum is lower when copper or aluminum with a better thermal conductivity is used, but the thermal conductivity is lower than that of copper, and aluminum can be used as the material of the end-cycle lower case 8 under the condition that the heat dissipation performance is satisfied.
In an embodiment of the present invention, the end portion circulation upper housing 7 and the end portion circulation lower housing 8 are respectively provided with a rotation shaft through hole, the rotation shaft through hole is disposed at a corresponding position in the first protrusion circular ring 13, and a rotation shaft of the rotor 1 is inserted into the rotation shaft through hole, so that the rotor 1 passes through the end portion circulation upper housing 7 and the end portion circulation lower housing 8 to be connected to other mechanical equipment.
In an embodiment of the present invention, the heat sink 4 includes a limiting member 18 and a flow guiding member 19, the flow guiding member 19 is fixedly connected to the stator core 2 through the limiting member 18, the width of the flow guiding element 19 is smaller than the width corresponding to the limiting element 18, the flow guiding element 19 is provided with the through hole 6 and is fixedly connected with the stator core 2 only through the limiting element 18, and the wall thickness of the flow guide 19 is reduced to improve the cooling effect of the cooling liquid in the through hole 6 when the strength of the fixing part of the heat sink 4 and the stator core 2 is improved by providing only the through hole 6 in the flow guide 19, the heat generated by the winding 3 is absorbed and radiated, the temperature of the winding 3 is reduced, and the resistance generated by the heating of the winding 3 is reduced, so that the current of the winding 3 is increased, and the power density of the motor is improved.
In an embodiment of the present invention, the position-limiting members 18 are cylinders, a heat sink 4 mounting groove is disposed between adjacent windings 3, the mounting groove is disposed on an inner sidewall of the stator core 2, the position-limiting members 18 are fixedly connected to the mounting groove, and the shape and size of the mounting groove are matched with the position-limiting members 18, so that the position-limiting members 18 are fixedly connected to the mounting groove of the stator core 2, and the position-limiting members 18 are tightly fitted to the mounting groove, thereby preventing the position-limiting members 18 from falling off due to vibration generated by rotation of the rotor 1.
In an embodiment of the present invention, the position-limiting member 18 has a notch, the sidewall of the flow-guiding member 19 is fixedly connected to the notch, and the shape and size of the connection portion of the flow-guiding member 19 and the notch are matched with each other, so that the flow-guiding member 19 is fixedly connected to the notch, thereby strengthening the connection portion of the position-limiting member 18 and the flow-guiding member 19.
In an embodiment of the present invention, the current guiding element 19 is a rectangular parallelepiped, so that the cooling effect of the current guiding element 19 on the corresponding portion of the winding 3 is the same, and the uneven cooling of the winding 3 by the current guiding element 19 is avoided.
In an embodiment of the present invention, the heat sink 4 is made of copper, and the copper has good thermal conductivity, so as to improve a cooling effect of the cooling liquid in the through hole 6, absorb and dissipate heat generated by the winding 3, reduce the temperature of the winding 3, reduce resistance generated by the winding 3 due to heat generation, increase current of the winding 3, and further improve power density of the motor.
In the embodiment of the present invention, the inner side wall of the through hole 6 is fixedly provided with a plurality of flow dividing members, so that the cooling liquid is uniformly distributed in the through hole 6, and the through hole 6 is filled with the cooling liquid, thereby improving the heat dissipation effect.
In an embodiment of the present invention, the winding structure further includes an insulating layer, wherein the insulating layer covers the winding 3 and separates the winding 3 from the heat sink 4 to prevent a short circuit between the winding 3 and the heat sink 4.
In an embodiment of the present invention, the heat conducting layer is further included, the heat conducting layer is filled between adjacent windings 3, the heat dissipating fins 4 are disposed in the heat conducting layer, so that heat of the windings 3 is uniformly transferred to the heat dissipating fins 4, a heat transfer path is reduced, and a heat dissipating effect of the heat dissipating fins 4 is improved, the heat conducting layer is generally made of air and epoxy resin, in this embodiment, the heat conducting layer is preferably made of epoxy resin, heat generated by the windings 3 is transferred to the epoxy resin, and then the heat generated by the windings 3 is transferred to the heat dissipating fins 4 and the coolant for heat absorption and dissipation, so that a temperature of the windings 3 is reduced, and a resistance generated by the windings 3 due to heat generation is reduced, thereby increasing a current of the windings 3, and further improving a power density of the motor, and the epoxy resin also plays a role of fixing the heat dissipating fins and the windings, the shock resistance of the motor is improved.
In an embodiment of the present invention, the present invention further includes a motor housing 20, an inner sidewall of the motor housing 20 is fixedly connected to an outer sidewall of the stator core 2, and an inner sidewall of the motor housing 20 is also fixedly connected to an outer sidewall of the end portion circulation upper housing 7, the flow guiding device 5 is fixed to the motor housing 20, so as to prevent the flow guiding device 5 from sliding in an axial direction and leakage of the coolant, a rotating shaft of the rotor 1 is fixedly connected to the motor housing 20 through a bearing, so as to prevent the stator core 2 and the rotor 1 from directly contacting with the outside, the stator core 2 and the rotor 1 are displaced from each other due to an external force, and dust and water in air are prevented from damaging the stator core 2 and the rotor 1, so as to prolong the service life of the stator core 2 and the rotor 1.
According to the motor with the heat dissipation structure, the heat dissipation efficiency of the motor is improved by additionally arranging the heat dissipation fins 4, the current of the motor in normal operation is increased, and the power of the motor is further improved; the through holes 6 are additionally arranged on the radiating fin 4, so that air or coolant flows through the through holes 6, the contact area between the radiating fin 4 and the air or the coolant is increased, and the radiating effect of the radiating fin 4 is improved; the limiting piece 19 is additionally arranged, so that the radiating fin 4 is clamped on the inner side wall of the stator core 2, and the radiating fin 4 is prevented from shifting when a motor runs, so that uneven heat radiation is avoided; moreover, the insulating layer is additionally arranged, so that the heat radiating fin 4 is prevented from generating heat due to the fact that current flows on the heat radiating fin 4, and short circuit is effectively prevented from occurring; moreover, the heat conduction layer is additionally arranged, so that the heat of the winding is uniformly transferred to the radiating fins 4, and the radiating effect of the radiating fins 4 is further improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A motor with a heat dissipation structure comprises a rotor and a stator core, wherein the rotor penetrates through the stator core and rotates in the stator core, and a plurality of windings are arranged in the stator core;
the radiating fins are provided with through holes which penetrate through two ends and are used for forming air convection or cooling agent conduction; specifically, the heat sink includes a limiting member and a flow guiding member, the flow guiding member is fixedly connected to the stator core through the limiting member, and the width of the flow guiding member is smaller than the width corresponding to the limiting member, and the flow guiding member is provided with the through hole; specifically, the limiting part is provided with a notch, the side wall of the flow guide part is fixedly connected with the notch, and the shape and the size of the connection part of the flow guide part and the notch are matched with those of the notch, so that the flow guide part is fixedly connected with the notch, and the connection part of the limiting part and the flow guide part is reinforced; the locating part is a cylinder, a cooling fin mounting groove is arranged between adjacent windings, the locating part is fixedly connected with the mounting groove, the shape and the size of the mounting groove are matched with the locating part, the locating part is fixedly connected in the mounting groove of the stator core, and therefore the locating part is tightly matched with the mounting groove, and the locating part is prevented from falling due to vibration generated by rotation of the rotor.
2. The motor with the heat dissipation structure as claimed in claim 1, wherein a plurality of flow dividers are fixedly disposed on an inner sidewall of the through hole.
3. The motor having a heat dissipation structure as set forth in claim 1, wherein the flow guide member is a rectangular parallelepiped.
4. The motor having a heat dissipation structure according to claim 1, further comprising an insulating layer that covers the winding.
5. The electric motor having a heat dissipation structure as claimed in claim 4, further comprising a heat conductive layer, and the heat conductive layer is filled between adjacent windings.
6. The motor with the heat dissipation structure of claim 1, further comprising a motor housing, wherein an inner side wall of the motor housing is fixedly connected to an outer side wall of the stator core, and a rotation shaft of the rotor is fixedly connected to the motor housing through a bearing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810699704.0A CN108736630B (en) | 2018-06-29 | 2018-06-29 | Motor with heat radiation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810699704.0A CN108736630B (en) | 2018-06-29 | 2018-06-29 | Motor with heat radiation structure |
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| Publication Number | Publication Date |
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| CN108736630A CN108736630A (en) | 2018-11-02 |
| CN108736630B true CN108736630B (en) | 2020-12-22 |
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| CN201810699704.0A Active CN108736630B (en) | 2018-06-29 | 2018-06-29 | Motor with heat radiation structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109167464B (en) * | 2018-11-16 | 2021-04-06 | 浙江盘毂动力科技有限公司 | Stator module and axial magnetic field motor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2503672A2 (en) * | 2011-03-22 | 2012-09-26 | Hamilton Sundstrand Corporation | Motor stator having channels used for cooling and method of providing the channels |
| CN105048663A (en) * | 2010-07-30 | 2015-11-11 | 通用电气航空系统有限责任公司 | Apparatus for a high speed sleeveless rotor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012217711A1 (en) * | 2012-09-28 | 2014-04-03 | Magna Powertrain Ag & Co. Kg | Electric machine with cooling |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048663A (en) * | 2010-07-30 | 2015-11-11 | 通用电气航空系统有限责任公司 | Apparatus for a high speed sleeveless rotor |
| EP2503672A2 (en) * | 2011-03-22 | 2012-09-26 | Hamilton Sundstrand Corporation | Motor stator having channels used for cooling and method of providing the channels |
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