JP2007330061A - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve technology for adjusting balance of a rotor in a rotary electric machine compared to a conventional case. <P>SOLUTION: Fan rings are installed on both sides of a core in the rotor. Cooling blades for cooling are fitted to the fan rings, and holes for balance adjustment are formed in the fan rings. Balance weights working as the weights for balance adjustment are installed by using the holes. Weight balance of the rotor is adjusted. The cooling blades are supported by the fan rings through a stay member realizing adjustment by shifting fitting positions to the fan rings. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for providing a rotating electrical machine.

  In a rotating electrical machine, there is one disclosed in Patent Document 1 for adjusting the balance of a rotor.

Japanese Unexamined Patent Publication No. 6-13381

FIG. 1 is a cross-sectional view of a conventional rotating electrical machine. FIG. 2 shows a configuration diagram of the rotor portion.
A stator 1 is attached to the inner peripheral wall of the housing 4. The stator 1 includes a stator core 1 a formed by laminating a predetermined number of thin plates made of a magnetic material such as a silicon steel plate in the vertical direction, and an inner periphery. And a stator coil 1b wound around a slot provided in a large number.
The rotor 2 has a shaft 9, and the shaft 9 is rotatably held by the bearings 3 of the end brackets 6 a and 6 b, so that the rotor 2 rotates at a position located on the inner peripheral portion of the stator 1. Yes.

  The rotor 2 is provided with a secondary conductor bar and a short-circuit ring 2b (not shown), and an internal cooling fan (hereinafter referred to as an internal fan 7) is formed integrally with the short-circuit ring 2b. .

  The inner fan 7 is composed of a plurality of honey 7a protruding in the axial direction from both end faces of the short-circuit ring 2b, and circulates air inside the electric motor so as to obtain a cooling action. That is, the air flow generated by the inner fan 7 passes while cooling the rotor 2, the short-circuit ring 2 b and the stator 1, and then passes along the inner surfaces of the brackets 6 a and 6 b whose temperature rise is lower than that of the housing 4. Dissipate heat when you do.

  In the prior art, as shown in FIG. 2, in order to adjust the balance, it is common to provide a protrusion 2c integrated with a short-circuit ring 2b of a rotor 2 using aluminum as a conductor, and to attach the balance weight 2b by caulking. It is. When the conductor is a brittle material such as an aluminum alloy, the protrusion 2c may not be provided. In this case, although not shown in the figure, both ends of the rotor 2 are attached with a balance ring, or a hole is formed in the iron core of the rotor 2 for balancing, and the balance weight 5 is attached using this hole to adjust the balance. Sometimes.

  By the way, when the balance adjusting hole is made in the above-described rotor core 2a, for example, if the weight of the rotor 2 itself is increased, there may be a problem that the handling workability is deteriorated.

  In addition, a hole is made in the magnetic path of the core magnetic field lines, and it may be necessary to consider the influence of characteristics.

  Therefore, it is an object to improve the balance adjustment in the rotor 2 as compared with the conventional case.

  In order to solve the above problems, the following measures are taken.

  A fan ring 8 is provided on both sides of the core of the rotor 2, a cooling fan for cooling (inner fan fan 7 a) is attached to the fan ring 8, and a balance adjusting hole is provided in the fan ring 8. The weight balance of the rotor 2 is adjusted by using this hole to provide a balance weight 5 that is a weight for adjusting the balance.

  Or a stator having a stator core and a stator coil wound around the stator core, a housing for supporting the stator, end brackets provided at both ends in the longitudinal direction of the housing, and the end In a rotating electrical machine having a bearing provided on a bracket, a rotating shaft that is rotatably supported by the bearing, and a rotor that rotates about the rotating shaft, at both ends of the rotor in the direction of the rotating shaft A fan ring is provided, a cooling fan for cooling is attached to the fan ring, and a hole for balance adjustment is provided in the fan ring.

  Further, the balance adjusting hole is in the vicinity of the outer peripheral side of the fan ring.

  In addition, the cooling honey is supported by an adjustment member that can adjust the position in which the cooling honey is attached and supported in the radial direction, and the adjustment member is supported by the fan ring.

  The position at which the adjustment member is supported by the fan ring is on the inner peripheral side with respect to the position of the balance adjustment hole.

  ADVANTAGE OF THE INVENTION According to this invention, provision of the rotary electric machine which improved reliability rather than before is attained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. In each figure, the common code | symbol shows the same thing.

  FIG. 3 shows a sectional view of a rotating electrical machine as an embodiment according to the present invention. FIG. 4 shows a configuration diagram of the rotor portion.

A fan ring 8 shown in FIG. 5 for attaching the inner fan 7 is provided on the shaft 9 in the vicinity of both ends of the rotor 2, and the inner fan 7 is fixed to the shaft by screwing or the like.
The fan ring 8 is provided with a screw hole for fixing the inner fan 7 and a screw hole for attaching the balance weight 5 and fastened with a bolt.

  Further, a screw hole is provided so that the balance weight 5 for balance adjustment can be attached to the fan ring 8. By setting the screw hole position in the vicinity of the outer periphery of the fan ring 8, the amount of the balance weight 5 to be attached can be reduced, and balance adjustment becomes easy.

  The inner fan 7 is desirably located in the vicinity of both ends of the rotor 2, and is set to a position where the generated air flow directly hits the stator coil 1b.

  For more effective cooling, it is effective to increase the air flow rate of the inner fan 7, and it is necessary to increase the outer diameter of the inner fan 7 as much as possible. It is also desirable that the balance weight 5 for adjusting the balance be positioned as close to the outer periphery as possible. In order to achieve both the radial position of the inner fan 7 and the radial position of the balance weight 5, the inner fan 7 is provided with a stay 7b so that the inner fan 7 can be shifted and adjusted in the axial direction. To do.

The fixing position of the fan ring 8 and the stay 7b is provided on the inner peripheral side of the fan ring 8 so as to ensure an air flow rate necessary for cooling while ensuring a space for attaching the balance weight 5.
As described above, according to the embodiment of the present invention, when the rotor conductor material is a brittle material or the like and the shorting ring 2a of the rotor 2 cannot be provided with the balance adjustment protrusion, the cooling performance of the rotating electrical machine is not reduced. It is possible to provide good balance work.

Internal configuration diagram of a conventional electric motor Motor rotor block diagram according to the prior art Motor internal configuration diagram according to an embodiment of the present invention Motor rotor configuration diagram according to an embodiment of the present invention FIG. 3 is a configuration diagram of a fan ring unit according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Stator, 1a ... Stator iron core, 1b ... Stator coil,
2 ... Rotor, 2a ... Rotor core, 2b ... Short-circuit ring, 2c ... Protrusion for attaching balance weight,
3 ... bearing, 4 ... housing, 5 ... balance weight,
6a: Anti-external fan side end bracket, 6b: Outer fan side end bracket,
7 ... inner fan, 7a ... inner fan honey, 7b ... inner fan stay,
8 ... Fan ring, 8a ... Balance weight mounting screw hole, 8b ... Internal fan mounting screw hole,
9 ... shaft, 10 ... outer fan, 11 ... end cover,
12 ... End bracket, housing fastening bolt

Claims (4)

A stator having a stator core and a stator coil wound around the stator core;
A housing that supports the stator;
End brackets provided at both ends of the housing in the longitudinal direction;
A bearing provided on the end bracket;
A rotating shaft rotatably supported by the bearing;
A rotor that rotates about the rotation axis;
In a rotating electrical machine having
Fan rings are provided at both ends of the rotor in the rotation axis direction,
Attach a cooling fan for cooling to the fan ring,
Further, a rotating electric machine characterized in that a balance adjusting hole is provided in the fan ring. The rotating electrical machine according to claim 1, wherein
The rotating electrical machine characterized in that the balance adjusting hole is located near the outer peripheral side of the fan ring. The rotating electrical machine according to claim 1, wherein
A rotating electrical machine characterized in that a cooling spring is supported by an adjustment member capable of adjusting a radial support position of the cooling spring, and the adjustment member is supported by the fan ring. In the rotating electrical machine according to claim 3,
The rotating electrical machine is characterized in that the position at which the adjustment member is supported by the fan ring is located on the inner peripheral side of the position of the balance adjusting hole.

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