JPS6026502Y2 - rotor of rotating electric machine - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to the structure of a cylindrical rotor for a rotating electric machine.

Rotating electric machines with a cylindrical rotor, such as wound induction machines and DC machines, have disk-shaped thin iron plates laminated around the shaft, and both ends of this laminated core are pressed with annular core holders, either directly or via a spider. It is fixed to the shaft and the coil is housed in a winding groove provided on the outer periphery of the core.

The core holder supports the coil end via an insulator and also serves to prevent the coil from deforming due to rotation.

Normally, the rotor core is provided with a ventilation hole that passes through the laminated core and the core holder in the axial direction and communicates with both ends for cooling. It is desirable that cooling is also carried out effectively.

FIG. 1 is a longitudinal sectional view showing the end of the core of a conventional wound induction machine, and FIG. 2 is a side view of the rotor core.

A rotor core 1 made of laminated thin iron plates is tightened at both ends with core holders 2, fixed to a shaft 5 by keys 3 and 4, and a rotor coil 7 is housed in a winding groove 6 provided on the outer periphery of the rotor core. ing.

A ventilation hole 8 parallel to the shaft 5 is provided around the shaft 5 of the rotor core 1 and the core holder 2 so as to pass through both ends thereof.

A stator core 9 concentrically surrounds the rotor core 1 with a narrow gap in between, and a stator coil 10 is wound around the stator core 9.

During operation, the cooling air flows through the stator coil 10 as shown by the arrow.
9 The air is blown onto the end of the rotor coil 7, and is divided into two directions, one passing through the outside of the stator core 9 and the other passing through the ventilation holes 8 of the rotor core, for cooling. There is.

With this structure, almost no air hits the coil ends, especially the inside of the stator coil end and the outside of the rotor coil end, so the coil is not cooled sufficiently, resulting in a high temperature rise in the coil. There are drawbacks.

The object of the present invention is to eliminate the above-mentioned drawbacks, add simple processing, and provide a rotor whose coil end portions are effectively cooled.

Next, embodiments of the present invention will be described based on the drawings.

Fig. 3 is a side view of a rotor core holder according to an embodiment of the present invention, Fig. 4 is a longitudinal sectional view thereof, and Fig. 5 is a longitudinal sectional view of the core end of a wound induction machine with this core holder attached. It is.

Reference numerals 1 to 10 are the same as in FIG.

That is, a rotor core 1 made of laminated thin iron plates is tightened at both ends with core holders 2, and is fixed to a shaft 5 with a key 4.
A rotor coil 7 is housed in a winding groove provided on the outer periphery of the rotor core.

A ventilation hole 8 parallel to the shaft 5 is provided around the shaft 5 of the rotor core 1 and the core holder 2 so as to pass through both ends thereof.

A stator core 9 concentrically surrounds the rotor core 1 with a narrow gap in between, and a stator coil 10 is wound around the stator core 9.

In contrast, in the present invention, ventilation holes 21 are provided in the end surface of the rotor core holder 2 on the side in contact with the laminated core, perpendicular to the ventilation holes 8, and radially extending in the outer circumferential direction.

By providing the radial ventilation holes 21, when the rotor rotates, the grooves 21 function as a fan, blowing out part of the air sent into the ventilation holes 8 through the grooves 21. As shown by the arrows in FIG. 5, the rotor coil end and the stator coil end are cooled and the flow flows to the outer periphery of the stator, so that the coil is effectively cooled.

Furthermore, in the present invention, an insulator 12 is inserted between the core holder 2 and the rotor coil end 7 in the portion of the ventilation groove 21 excluding the opening, and the outer periphery of the rotor coil end is covered with the core holder. 2 is fastened with a bind tape 11, and this bind tape 11 is also wound except for the portion in the radial direction of the opening of the ventilation groove 21.

Therefore, the air blown from the ventilation groove 21 effectively flows in the radial direction without leaking in the axial direction from the gap between the rotor coil end 7 and the core holder 2, so that Cooling of the coil end 10 becomes better.

As is clear from the above description and also shown in FIG. 4, the core holder 2 has a simple shape and can be easily cast, for example, although it has ventilation holes 8, ventilation grooves 21, and a flange portion for fastening the coil ends. It can be shaped into

Moreover, in medium-sized rotating electric machines that do not require air ducts in the stator core or rotor core, the outermost ends of coil ends 7 and 10 can be cooled, but the coil ends near the end face of the core can be cooled. is relatively bad, but
According to the present invention, this weakness in cooling is improved, and the overall level of the electric machine is improved.

According to the present invention, by adding a simple groove to the rotor core holder, ventilation cooling of the coil end is improved, the temperature rise of the rotor and stator coils is reduced, and the life of the rotating electric machine is increased, and the machine is compact and lightweight. This may have the effect of reducing prices due to the ability to

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the core end of a conventional wound induction machine, FIG. 2 is a side view of the rotor core, and FIG. 3 is a side view of a rotor core holder according to an embodiment of the present invention. FIG. 4 is a longitudinal sectional view of the same, and FIG. 5 is a longitudinal sectional view of the core end of the wound induction machine with this core holder attached. 1: Rotor core, 2: Rotor core holder, 3゜4: Key
5: shaft, 6: rotor winding groove, 7: rotor coil, 8: ventilation hole, 9: stator core, 10: stator coil.

Claims (1)

[Scope of utility model registration request] In a rotor in which an annular core holder is provided at both ends of a rotor core made of a laminated core, a plurality of ventilation holes passing through the core holder and the rotor core in the axial direction are provided, and the core is in contact with the rotor core. A plurality of ventilation grooves are provided on the end face of the presser foot, which communicate with the respective ventilation holes in a radial manner and open on the outer circumferential surface of the core presser, and between the core presser and the rotor coil end except for the openings of the ventilation grooves. An insulator is inserted into the rotor coil end, and the outer periphery of the rotor coil end is fastened to the core holder using a bind tape, and the bind tape is wound except for a portion in the radial direction of the opening. Rotor of rotating electric machine.