JP2016032340A - Rotor of dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce stress at a bridge between magnets, when fitting a rotor shaft and during rotation of the rotor.SOLUTION: First and second ribs 41, 42 having the same number as the magnetic poles 22, for connecting the inner and outer peripheries of lightening holes 43, 44, are provided corresponding to respective magnetic poles 22, and the peripheral positions of the outer peripheral ends 41b, 42b of respective ribs 41, 42 correspond to the peripheral positions of a bridge 24 between respective permanent magnets 22a, 22b. Each first rib 41 extends linearly while inclining in the circumferential direction for the radial direction, in such a state that the circumferential position of the inner peripheral end 41a is shifted to one circumferential side from the circumferential position of the outer peripheral end 42b. Each second rib 42 extends linearly while inclining in the circumferential direction for the radial direction, in such a state that the circumferential position of the inner peripheral side end 42a is shifted to the other circumferential side from the circumferential position of the outer peripheral end 42b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotor of a rotating electrical machine, and more particularly to a rotor in which a rotor shaft is fitted on the inner peripheral side.

  A rotor of a rotating electrical machine disclosed in Patent Document 1 is provided with a first annular portion in which a rotor shaft is fitted on the inner peripheral side, and an outer peripheral side of the first annular portion, and a plurality of magnetic poles are arranged along the circumferential direction. And a plurality of ribs connecting the first annular portion and the second annular portion, and each magnetic pole has a pair of circumferentially adjacent via a bridge portion (magnetic bridging portion) Has a magnet. In Patent Document 1, the stress generated when the rotor shaft is press-fitted is absorbed by the deformation of the rib so as not to be transmitted to the bridge portion of the second annular portion.

JP 2013-208014 A JP 2009-303446 A JP 2004-194419 A

  In Patent Document 1, the outer peripheral side end of the rib is connected to the second annular portion at a position shifted in the circumferential direction with respect to the bridge portion between the magnets, and a hollow hole is formed on the inner peripheral side of the bridge portion. For this reason, the rigidity of the second annular portion at the circumferential position of the bridge portion is low, and the stress of the bridge portion is increased with respect to the centrifugal force when the rotor rotates.

  The rotor of the rotary electric machine which concerns on this invention aims at reducing the stress of the bridge part between magnets at the time of fitting a rotor shaft and a rotor rotation.

  The rotor of the rotating electrical machine according to the present invention employs the following means in order to achieve the above-described object.

  The rotor of the rotating electrical machine according to the present invention includes a first annular portion in which the rotor shaft is fitted on the inner peripheral side, an outer peripheral side of the first annular portion, and a plurality of magnetic poles arranged along the circumferential direction. The second annular part and the inner peripheral side end are connected to the first annular part, and the outer peripheral side end is connected to the second annular part, so that the first and Each magnetic pole has a pair of magnets adjacent to each other in the circumferential direction via the bridge portion, and the first and second ribs are provided corresponding to each magnetic pole, And the circumferential position of the outer peripheral side end of the second rib corresponds to the circumferential position of the bridge portion, and each first rib has a circumferential position of the inner peripheral side end portion than the circumferential position of the outer peripheral end portion. The second ribs are provided so as to be inclined in the circumferential direction with respect to the radial direction in a state shifted to one side in the circumferential direction. And summarized in that is provided obliquely with respect to the radial direction in the circumferential direction with a shift toward the other side.

  According to the present invention, the stress at the time of fitting the rotor shaft can be absorbed by the deformation of the first and second ribs, and the stress of the bridge portion between the magnets in the second annular portion can be reduced. Furthermore, since the circumferential position of the outer peripheral side end of each first and second rib corresponds to the circumferential position of the bridge portion, the second position at the circumferential position of the bridge portion with respect to the centrifugal force at the time of rotor rotation. The rigidity of the annular portion can be improved, and the stress of the bridge portion when the rotor rotates can be reduced.

It is a figure which shows schematic structure seen from the direction along the rotating shaft of the rotor of the rotary electric machine which concerns on embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of a rotor of a rotating electrical machine according to an embodiment of the present invention, and shows a configuration example viewed from a direction along a rotor rotating shaft 10a. In FIG. 1, a part of the configuration of the rotor is illustrated with respect to the circumferential direction, but the configuration of the remaining portion that is not illustrated is the same configuration as the illustrated portion.

  The rotor is disposed on the inner peripheral side of a stator (not shown), is opposed to the stator with a gap in the radial direction, and is rotatable relative to the stator. The rotor includes a rotor core 21 and a plurality of magnetic poles 22 disposed on the rotor core 21. The rotor core 21 is provided on the outer peripheral side of the first annular portion 31 having the shaft fitting hole 30 formed on the inner peripheral side, and the plurality of magnetic poles 22 are spaced apart from each other along the circumferential direction. And the first and second ribs 41 and 42 connecting the first annular portion 31 and the second annular portion 32. The first and second ribs 41 and 42 connect the inner and outer peripheries of the lightening holes 43 and 44 to reduce the weight of the rotor. The shaft fitting hole 30 is formed along the rotor rotation axis direction, and the central axis of the shaft fitting hole 30 coincides with the rotor rotation axis 10a. By fitting the rotor shaft 16 into the shaft fitting hole 30 by press fitting, the rotor shaft 16 is fixed to the rotor and rotates integrally.

  In each of the plurality of magnetic poles 22, a pair of magnet insertion holes 23a and 23b are formed in a V shape in the second annular portion 32, and the permanent magnets 22a and 22b are inserted into the magnet insertion holes 23a and 23b, respectively. This is embedded in the second annular portion 32. One magnetic pole 22 is constituted by a pair of V-shaped permanent magnets 22a and 22b. However, the shape of the magnet insertion holes 23a, 23b (permanent magnets 22a, 22b) may be other than the V shape. In each magnetic pole 22, the permanent magnets 22 a and 22 b (magnet insertion holes 23 a and 23 b) are adjacent to each other in the circumferential direction via a bridge portion (magnetic bridging portion) 24. As shown in FIG. 1, in the rotor, the direction of the magnetic flux passing through the circumferential center position (V-shaped valley position, position of the bridge portion 24) of each magnetic pole 22 is d-axis (flux axis) and adjacent to the circumferential direction. The position between the magnetic poles 22 to be moved (position shifted by 90 ° in electrical angle from the d axis) is defined as the q axis (torque axis).

  The first and second ribs 41 and 42 are provided in the same number as the magnetic poles 22 corresponding to the magnetic poles 22. An inner peripheral side end portion 41 a of each first rib 41 is connected to the first annular portion 31, and an outer peripheral side end portion 41 b of each first rib 41 is connected to the second annular portion 32. Similarly, the inner peripheral end 42 a of each second rib 42 is connected to the first annular portion 31, and the outer peripheral end 42 b of each second rib 42 is connected to the second annular portion 32. The circumferential position of the outer peripheral side end portion 41b of each first rib 41 corresponds to the circumferential position of the bridge portion 24 (d-axis) between the permanent magnets 22a and 22b, and the outer peripheral side end portion of each second rib 42. The circumferential position of 42b also corresponds to the circumferential position of the bridge portion 24 (d-axis) between the permanent magnets 22a and 22b. That is, the outer peripheral side end portions 41 b and 42 b of the ribs 41 and 42 are opposed to the bridge portions 24 in the radial direction.

  Each first rib 41 is inclined in the circumferential direction with respect to the radial direction in a state where the circumferential position of the inner circumferential end 41a is shifted to the circumferential one side from the circumferential position (d axis) of the outer circumferential end 41b. It extends in a straight line. On the other hand, each second rib 42 has a circumferential position relative to the radial direction in a state where the circumferential position of the inner circumferential end 42a is shifted from the circumferential position (d-axis) of the outer circumferential end 42b to the other circumferential side. It inclines and extends linearly. The magnitude of the inclination angle with respect to the radial direction of each first rib 41 and the magnitude of the inclination angle with respect to the radial direction of each second rib 42 are equal to each other. In the example of FIG. 1, the circumferential position of the inner circumferential side end portion 41 a of each first rib 41 corresponds to the circumferential position between adjacent magnetic poles 22 (q axis), and the inner circumferential side of each second rib 42. The circumferential position of the end 42a also corresponds to the circumferential position between adjacent magnetic poles 22 (q axis).

  A lightening hole 43 is formed between the ribs 41 and 42 corresponding to the same magnetic pole 22. The lightening hole 43 has a substantially triangular shape in which the circumferential length gradually increases from the radially outer side toward the radially inner side. In addition, between the first rib 41 (or second rib 42) corresponding to one magnetic pole 22 adjacent in the circumferential direction and the second rib 42 (or first rib 41) corresponding to the other magnetic pole 22, A lightening hole 44 is formed. The lightening hole 44 has a substantially inverted triangular shape in which the circumferential length gradually decreases from the radially outer side toward the radially inner side. By forming the lightening holes 43 and 44 in the rotor core 21, it is possible to reduce the weight of the rotor and to increase the response by reducing the inertia.

  When the rotor shaft 16 is press-fitted into the shaft fitting hole 30 of the rotor core 21, stress acts on the rotor core 21 and the rotor core 21 tends to be deformed. On the other hand, in this embodiment, the stress at the time of press-fitting the rotor shaft 16 into the shaft fitting hole 30 can be absorbed by the deformation of the first and second ribs 41 and 42, and between the permanent magnets 22a and 22b. The stress acting on the second annular portion 32 such as the bridge portion 24 can be reduced. As a result, the distortion of the outer peripheral portion of the second annular portion 32 and the bridge portion 24 due to the press-fitting of the rotor shaft 16 can be reduced. By reducing the distortion of the outer peripheral portion of the second annular portion 32, the gap between the stator and the rotor can be reduced. As a result, the torque between the stator and the rotor can be increased, and the rotating electrical machine can be downsized.

  Furthermore, since the outer peripheral side end portions 41b and 42b of both ribs 41 and 42 are connected to the second annular portion 32 at the circumferential position of the bridge portion 24 (d-axis), the centrifugal force during the rotation of the rotor is prevented. Thus, the rigidity and strength of the second annular portion 32 at the circumferential position of the bridge portion 24 can be improved, and the stress of the bridge portion 24 when the rotor rotates can be reduced. By reducing the stress of the bridge portion 24, the width of the bridge portion 24 can be reduced, and the magnetic flux flowing through the bridge portion 24 (magnetic flux that does not contribute to the torque between the stator and the rotor) can be reduced. As a result, the torque between the stator and the rotor can be increased.

  Further, since the magnitude of the inclination angle with respect to the radial direction of each first rib 41 and the magnitude of the inclination angle with respect to the radial direction of each second rib 42 are equal to each other, the rigidity and strength of the rotor regardless of the direction of rotation and torque of the rotor. Can be secured. As a result, a large regenerative torque (or power running torque) can be obtained.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

  16 Rotor shaft, 21 Rotor core, 22 Magnetic pole, 22a, 22b Permanent magnet, 23a, 23b Magnet insertion hole, 24 Bridge part, 30 Shaft fitting hole, 31 1st ring part, 32 2nd ring part, 41 1st Rib, 42 2nd rib, 41a, 42a Inner peripheral side end, 41b, 42b Outer peripheral end, 43, 44 Venting hole.

Claims (1)

A rotor of a rotating electric machine,
A first annular portion in which the rotor shaft is fitted on the inner peripheral side;
A second annular portion provided on the outer peripheral side of the first annular portion, and a plurality of magnetic poles disposed along the circumferential direction;
First and second ribs connecting the inner and outer peripheries of the lightening hole by connecting the inner peripheral end to the first annular part and connecting the outer peripheral end to the second annular part,
With
Each magnetic pole has a pair of magnets adjacent in the circumferential direction via the bridge portion,
The first and second ribs are provided corresponding to each magnetic pole,
The circumferential position of the outer peripheral side end of each first and second rib corresponds to the circumferential position of the bridge portion,
Each first rib is provided to be inclined in the circumferential direction with respect to the radial direction in a state in which the circumferential position of the inner circumferential end is shifted to the circumferential one side from the circumferential position of the outer circumferential end,
Each of the second ribs is provided so as to be inclined in the circumferential direction with respect to the radial direction in a state where the circumferential position of the inner circumferential end is shifted from the circumferential position of the outer circumferential end to the other circumferential side. Electric rotor.

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