JP6470581B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine applied to automobiles and industrial equipment.

Electric motors (including various PM motors / generators) applied to industrial equipment such as automobiles, agricultural machinery, construction equipment, utility vehicles, etc. are mounted on equipment as series hybrid type or parallel hybrid type driving sources. Small and high output permanent magnet synchronous motors are used.
In this type of synchronous motor, there is a problem of reducing torque ripple that causes noise and vibration problems and causes deterioration of controllability, and is disclosed in Patent Document 1 as a solution to some extent. There is technology.

  In the technique of Patent Document 1, in a permanent magnet synchronous motor having a centralized stator, a side edge on the rotor side of at least one end of the teeth of the stator is cut away, and a side edge on the opposite side to the rotor side To prevent the demagnetizing magnetic flux from flowing to the rotor side by securing the thickness of the tooth end portion (claim 4).

Japanese Patent No. 3076006

In the above prior art, the torque ripple can be reduced to some extent by suppressing the flow of the demagnetizing magnetic flux. However, the cutting of the side edge of the teeth on the rotor side is short in the circumferential direction. Since it is too far away, the torque ripple cannot be reduced sufficiently and effectively.
It is an object of the present invention to provide a rotating electrical machine that can solve such problems of the prior art.

  In the present invention, an inclined surface gradually separating in the radially outward direction from both ends in the circumferential direction of the arc surface is formed at the tip end portion of the tooth, and the torque ripple is reduced by extending the inclined surface in the circumferential direction and reducing the deviation from the arc surface. It is an object of the present invention to provide a rotating electrical machine that can be reduced sufficiently and effectively.

Specific means for solving the problems in the present invention are as follows.
First, a stator 2 having a winding 3 wound around a tooth 2B having both end protrusions 2Ba that protrude in the circumferential direction at the tip is provided on the rotor facing surface 6 at the tip of the tooth 2B. , And an inclined surface 6B that gradually deviates circumferentially and radially outward from both circumferential ends of the circular arc surface 6A,
In the case of 8 poles and 12 slots, the inclined surface 6B has the inclined surface start point 6s set at approximately 7.5 ° from the center of the tooth 2B, and the circumferential length from the inclined surface start point 6s to the inclined surface end 6e is W, 0.0496 ≦ t / W ≦ 0.117 is set, where t is the distance from the arc surface 6A of the inclined surface end 6e.

Second, the circumferential length W is set to 10 mm .
Thirdly, a stator 2 having a winding 3 wound around a tooth 2B having a circumferentially projecting both end protrusion 2Ba at the tip is provided, and the outer surface of the rotor 4 is disposed on the rotor facing surface 6 at the tip of the tooth 2B. , And an inclined surface 6B that gradually deviates circumferentially and radially outward from both circumferential ends of the circular arc surface 6A,
In the case of 8 poles and 12 slots, the inclined surface. 6B, the inclined surface starting point 6s set from the teeth 2B center 7 to 8 °, the circumferential length dimension W from the inclined surface starting point 6s to the inclined plane end 6e and 10mm In addition, tan 3 ° ≦ t / W ≦ tan 7 ° is set, where t is a deviation dimension of the inclined surface end 6e from the circular arc surface 6A.

According to the present invention, torque ripple can be reduced sufficiently and effectively.
That is, inclined slope 6B is set to be approximately 7.5 ° inclined plane start 6s from teeth 2B around the perimeter dimension of the inclined surface starting point 6s to the inclined plane end 6e and is W, arcuate surface of the inclined plane end 6e When t is a deviation dimension from 6A, 0.0496 ≦ t / W ≦ 0.117 is set, so that the inclined surface 6B is long in the circumferential direction and the deviation from the arc surface 6A is small, and torque ripple Can be reduced sufficiently and effectively.

Further, since the circumferential length W is set to 10 mm , the torque ripple can be further sufficiently and effectively reduced.
Further, the inclined surface. 6B, the inclined surface starting point 6s set from the teeth 2B center 7 to 8 °, the circumferential length dimension W from the inclined surface starting point 6s to the inclined plane end 6e and 10 mm, the arc of the inclined surface terminating 6e Since the tan 3 ° ≦ t / W ≦ tan 7 ° is set when the deviation dimension from the surface 6A is t, the inclined surface 6B is long in the circumferential direction and the deviation from the arc surface 6A is reduced, and the torque ripple is reduced. It can be reduced sufficiently and effectively.

It is a front view which shows embodiment of this invention. It is a torque ripple rate and a torque table. It is a comparison table of magnetic flux density by the presence or absence of a deviation slope.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, the enlarged front view which looked at a part of rotary electric machine 1 (synchronous motor) from the axial center direction is shown, and the rotary electric machine 1 is attached to many teeth 2B of the annular stator 2 and the stator 2. The winding 3 has concentrated winding or distributed winding, and the rotor 4 has a permanent magnet embedded in the outer peripheral portion and is rotatably disposed inside the stator 2. The rotor 4 has no cuts or irregularities in the outer periphery, and no wind noise is generated.

The stator 2 is formed by laminating a large number of silicon steel plates, and is a yoke-integrated type in which teeth 2B protrude from the inner peripheral side of an annular yoke 2A and are arranged in a plurality in the circumferential direction. The terminal 3 has a widened shape, and a winding 3 is wound around the trunk portion with an insulating member interposed therebetween.
The teeth 2B have a tip-end-spreading shape, so that both end projections 2Ba projecting from the body portion in the circumferential direction are formed at the tip, and the tip 2 of the teeth 2B to the both ends projection 2Ba are opposed to the rotor 4. Yes.

On the rotor facing surface 6 at the tip of the tooth 2B, there are an arc surface 6A that is substantially along the outer periphery of the rotor 4, and an inclined surface 6B that gradually diverges in the circumferential direction and radially outward from both circumferential ends of the arc surface 6A. The divergence inclined surface 6B is mainly formed at a position corresponding to each end protrusion 2Ba.
The rotating electrical machine 1 is configured to have 8 poles and 12 slots. In this case, the inclined surface (divergence inclined surface) 6B has the inclined surface starting point 6s set to approximately 7.5 ° from the center of the tooth 2B, and the inclined surface starting point 6s. 0.03 ≦ t / W ≦ 0, where W is the circumferential dimension from the end of the inclined surface 6e to the inclined surface end 6e, and t is the distance from the arc surface 6A of the inclined surface end 6e (an extension of the arc surface 6A). .13.

  FIG. 2 shows an experimental measurement of the torque ripple rate and the torque when the circumference dimension W of the deviation slope 6B is 10 mm and the deviation dimension t is 0 to 1.4 mm. Although the torque drop is very small even at 1.4 mm, the torque ripple rate drops sharply from 0 to 0.5 mm in the deviation dimension t and low to 0.5 to 1.0 mm in the deviation dimension t. The rate is maintained, and the separation dimension t is gradually increased to 1.0 to 1.3 mm.

From this experimental result, in the case of 8 poles and 12 slots, the circumferential length W and the deviation dimension t of the deviation inclined surface 6B are 0.05 ≦ t / W ≦ 0.1 (more precisely, 0.0496 ≦ t / It is best to set it in the range of W ≦ 0.1170), and the torque ripple rate can be reduced to nearly 12%. It was also found that if the target is a torque ripple rate of 13% or less, the range of 0.04 ≦ t / W ≦ 0.12 is also possible.

  Then, comparing the magnetic flux density between the one having no divergence inclined surface 6B (the divergence dimension t is 0 mm) and the one having the divergence inclination surface 6B having a deviation dimension t of 1 mm, as shown in FIG. The magnetic flux density B [T] generated along with the rotation of the permanent magnet of the rotor 4 is such that the permanent magnet is more positive with the circular arc surface 6A than the one with a deviation dimension t of 1 mm of the deviation inclined surface 6B without the deviation inclined surface 6B. Although slightly less when facing each other, it is larger before and after the arc surface 6A is facing the front, and the rotation angle range is also widened.

  That is, with respect to the magnetic flux density between the stator 2 and the rotor 4, the magnetic flux density without the deviation inclined surface 6B changes abruptly as the rotor 4 rotates, but the deviation dimension t of the deviation inclined surface 6B is 1 mm. Although the maximum magnetic flux density is slightly reduced, the angle range is widened, and the magnetic flux density changes moderately, so that the waveform shape of the magnetic flux density B [T] approaches a sine wave. When the waveform shape of the magnetic flux density B [T] is brought close to a sine wave, the torque ripple is sufficiently and effectively reduced.

In the 8-pole 12-slot rotating electrical machine 1, since the angle from the center of the tooth 2B to the center of the slot is 15 °, setting the inclined surface starting point 6s to 7.5 ° from the center of the tooth 2B means that the inclined surface starting point is 6s is a point of 7.5 ° from the slot center.
Since the protrusion amount of the end protrusion 2Ba is large and small, when the end protrusion 2Ba has a large protrusion, the inclined surface starting point 6s may be an angle larger than 7.5 ° from the center of the tooth 2B. An angle smaller than 5 ° may be used.

The circumferential length W and the deviation dimension t from the inclined surface starting point 6s to the inclined surface end 6e are a right triangle with the deviation inclined surface 6B as the base or a right triangle with the deviation inclined surface 6B as the inclined long side, and tan 3 ° It is also possible to set an angle range of ≦ t / W ≦ tan 7 °.
In the present invention, the shape and positional relationship of each member in the embodiment are best configured as shown in FIG. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.

For example, in the stator 2, a stator piece is formed by a divided yoke and one tooth 2B (pole tooth portion) integrated therewith, and a plurality of the stator pieces are arranged in the circumferential direction to form one annular piece. It may be a stator piece annular coupling type constituting the stator.
The rotor 4 may be a permanent magnet pasted synchronous motor in which a permanent magnet is pasted on the outer peripheral surface.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 2 Stator 2A Yoke 2B Teeth 2Ba End protrusion 3 Winding 4 Rotor 6 Rotor facing surface 6A Arc surface 6B Deviation inclined surface 6e Inclined surface termination 6s Inclined surface start point W Perimeter length t Deviation size

Claims (3)

A stator (2) in which a winding (3) is wound around a tooth (2B) having both end protrusions (2Ba) projecting in the circumferential direction at the tip is provided, and a rotor facing surface at the tip of the tooth (2B) ( 6), a circular arc surface (6A) along the outer periphery of the rotor (4) and an inclined surface (6B) gradually deviating in the circumferential direction and radially outward from both circumferential ends of the circular arc surface (6A) are formed. A rotating electric machine,
In the case of 8 poles and 12 slots, the inclined surface (6B) has the inclined surface start point (6s) set to approximately 7.5 ° from the center of the tooth (2B), and the inclined surface start point (6s) to the inclined surface end (6e). ) Is set to 0.0496 ≦ t / W ≦ 0.117, where W is the circumferential length up to), and t is the distance from the arc surface (6A) of the inclined surface end (6e). Rotating electric machine. The rotating electrical machine according to claim 1, wherein the circumferential length W is set to 10 mm . A stator (2) in which a winding (3) is wound around a tooth (2B) having both end protrusions (2Ba) projecting in the circumferential direction at the tip is provided, and a rotor facing surface at the tip of the tooth (2B) ( 6), a circular arc surface (6A) along the outer periphery of the rotor (4) and an inclined surface (6B) gradually deviating in the circumferential direction and radially outward from both circumferential ends of the circular arc surface (6A) are formed. A rotating electric machine,
In the case of 8 poles and 12 slots, the inclined surface (6B) has the inclined surface start point (6s) set to 7 to 8 ° from the center of the tooth (2B), and the inclined surface start point (6s) to the inclined surface end (6e). the perimeter dimensions W to and 10 mm, the deviation size of the arcuate surface of the inclined surface terminating (6e) (6A) when the t, it is set to tan3 ° ≦ t / W ≦ tan7 ° A rotating electric machine that is characterized.

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