CN111555482A - Permanent magnet type rotating motor - Google Patents

Abstract

The invention discloses a permanent magnet type rotating motor which comprises a stator punching sheet and a rotor punching sheet, wherein the stator punching sheet comprises a magnetic yoke and a plurality of tooth parts arranged on the inner side of the magnetic yoke, tooth top grooves are arranged on the top surfaces of the tooth parts, the width of a notch of each tooth top groove is L3, and the width of a notch between every two adjacent tooth parts is L0, so that the relationship is as follows: l3 is more than or equal to 0.9L0 and less than or equal to 1.1L 0; the rotor comprises a plurality of rotor punching sheets, each rotor punching sheet comprises a circular substrate, a shaft hole is formed in the center of the circular substrate, a plurality of magnetic steel holes are uniformly formed in the edge of the circular substrate along the circumferential direction, and a plurality of arc-shaped grooves are formed in the outer wall of the circular substrate; when the number of the grooves of each phase of each pole is an integer, the arc-shaped grooves are arranged every other pair of poles; when the number of the grooves of each phase of each pole is a fraction, the arc-shaped grooves are correspondingly configured every other pole; the radius of the arc-shaped groove is R1, wherein R1 is more than or equal to 0.95L0 and less than or equal to 1.5L0, the rotor is in a non-skewed pole structure and/or the stator is in a non-skewed slot structure. The permanent magnet type rotating motor of the invention improves the electromagnetic force and the cogging torque order and reduces the torque ripple.

Description

A permanent magnet rotating electrical machine

technical field

The invention relates to the technical field of new energy drive motors, in particular to a permanent magnet rotating motor.

Background technique

In recent years, under the influence of the market input of hybrid electric vehicles (HEV) and electric vehicles (EV) brought about by electrification, the demand and usage of high-speed drive motors have increased sharply. The main driving power source of HEV), in order not to make the driver and passengers feel uncomfortable, there are also strict requirements for the noise design of the motor. According to the analysis, the noise sources of the driving motor include mechanical noise and electromagnetic noise. The mechanical noise is mainly It is caused by the vibration of mechanical components such as bearings and the modal problems of the motor itself; electromagnetic noise is mainly caused by the internal torque pulsation and radial force wave of the motor, and the torque pulsation is related to the shape of the rotor, the length of the air gap and the motor itself. related to the natural frequency. Since the torque ripple (torque ripple) during high-speed operation will generate large noise, it is necessary to reduce the torque waveform of the drive motor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a permanent magnet rotating electrical machine, which can reduce the spatial low-order components and high-order torque fluctuations in the radial electromagnetic force component without the rotor having no inclined poles or the stator having no inclined slots, Reduce the difficulty and cost of the motor manufacturing process.

In order to achieve the above purpose, the present invention provides a permanent magnet rotating electrical machine, including a stator and a rotor, the stator includes a plurality of stator punches; the stator punches include a magnetic yoke and a plurality of teeth arranged inside the yoke The top surface of the tooth portion is provided with a tooth top groove for reducing the electromagnetic force, the notch width of the tooth top groove is L3, and the notch width between the two adjacent tooth portions is L0 ; The relationship between L3 and L0 is: 0.9L0≤L3≤1.1L0;

The rotor includes a plurality of rotor punching pieces, the rotor punching pieces include a circular substrate, the center of the circular substrate is provided with a shaft hole, and the edge of the circular substrate is uniformly arranged with a plurality of Magnetic steel holes, the outer wall of the circular substrate is provided with a plurality of arc-shaped grooves for reducing torque fluctuation; when the number of grooves per pole and phase is an integer number, the arc-shaped grooves are every other pair One pole is arranged; when the number of slots in each pole and each phase is a fraction, one arc-shaped groove is correspondingly configured for every other pole; the radius of the arc-shaped groove is R1, and the relationship between R1 and L0 is: 0.95L0≤ R1≤1.5L0;

The rotor is of a non-sloped pole structure and/or the stator is of a non-slanted-slot structure, and the non-sloped-pole structure means that the projections of the arc grooves on The oblique groove structure is that the projection of the addendum groove on the specified sub in the axial direction is aligned.

Further, the relationship between the number of slots per pole and phase is:

s is the number of slots per pole per phase;

N is the number of stator punching slots;

P is the number of rotor punching pole pairs;

M is the number of phases.

Further, the magnet steel hole includes a V-shaped first sub-magnet steel hole and a second sub-magnet steel hole.

Further, the first sub-magnet steel hole and the second sub-magnet steel hole have the same size.

Further, the arrangement shape of the magnetic steel holes is a "one" shape or a "V+one" shape or a "double V" shape.

Further, the addendum grooves are symmetrical based on the tooth centerline.

Further, each pole corresponds to a magnetic steel hole, and the arc-shaped groove is arranged on a center symmetry line between two adjacent magnetic steel holes.

Further, the circular substrate also has weight-reducing holes evenly arranged between the magnetic steel hole and the shaft hole.

Further, the weight-reducing hole is triangular.

Compared with the prior art, the present invention has the following advantages:

The permanent magnet rotating electrical machine of the present invention can reduce the spatial low-order components and high-order torque fluctuations in the radial electromagnetic force component under the condition that the rotor has no inclined poles and/or the stator has no inclined slots, thereby reducing the production of the motor. Difficulty and cost of manufacturing process; the size of adjacent magnetic steel holes is completely consistent, avoiding the problem of process and cost increase caused by the use of large and small poles; according to the number of slots per pole and phase, the outer wall position of the motor rotor is set with different numbers The arc groove is used to reduce the high frequency torque fluctuation of the motor.

Description of drawings

1 is a schematic structural diagram of a rotor punch in a permanent magnet rotating electrical machine according to an embodiment of the present invention;

Fig. 2 is a partial view of Fig. 1;

3 is a schematic structural diagram of a stator punch in a permanent magnet rotating electrical machine according to an embodiment of the present invention;

Fig. 4 is a partial view of Fig. 3;

Fig. 5 is the torque fluctuation trend diagram of the permanent magnet type rotating electrical machine of the present invention;

FIG. 6 is a trend diagram of the electromagnetic force of the permanent magnet rotating electrical machine of the present invention.

In the picture:

1-stator punching piece, 11-magnetic yoke, 12-tooth part, 14-tooth top groove; 2-rotor punching piece, 21-circular substrate, 22-shaft hole, 23-magnetic steel hole, 231-th One sub-magnet hole, 232-second sub-magnet hole, 24-arc groove; 3-weight reduction hole.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

Referring to FIG. 1 to FIG. 6 , this embodiment discloses a permanent magnet rotating electrical machine, including a stator and a rotor, the stator includes a plurality of stator punches 1 ; the stator punches 1 include a yoke 11 and a magnetic A plurality of tooth parts 12 on the inner side of the yoke 11, the top surface of the tooth parts 12 is provided with a tooth top groove 14 for reducing the electromagnetic force, the notch width of the tooth top groove 14 is L3, and between two adjacent tooth parts 12 The width of the slot is L0; the relationship between L3 and L0 is: 0.9L0≤L3≤1.1L0. As one of the problems related to the permanent magnet type rotating electrical machine, the cause of the noise is due to the electromagnetic force. The setting of the tooth tip groove 14 can change the direction of the generated magnetic field and balance the distribution of the magnetic field lines in the teeth of the motor stator, that is, the distribution of the magnetic flux in the air gap becomes smooth, and the order of the electromagnetic force is increased. can be reduced. In order to smooth the magnetic flux distribution in the air gap, the magnetic flux entering from the top of each tooth 12 must be limited or reduced to some extent. In this case, in order to reduce the electromagnetic force, generally by increasing the reluctance at the top of each tooth 12, ie away from the air gap. The relationship between the notch width L3 of the tooth top groove and the notch width L0 between the two adjacent tooth portions 12 is set as 0.9L0≤L3≤1.1L0, which can significantly improve the magnetic field concentration, improve the electromagnetic force and the tooth Slot torque order, thereby reducing the full-load low-order and low-load high-order noise when the motor is running.

The rotor includes a plurality of rotor punching sheets 2, the rotor punching sheet 2 includes a circular substrate 21, the center of the circular substrate 21 is provided with a shaft hole 22, and the edge of the circular substrate 21 is uniformly arranged with a plurality of The magnetic steel hole 23 and the outer wall of the circular substrate 21 are provided with a plurality of arc-shaped grooves 24 for reducing torque fluctuation; when the number of grooves per pole and phase is an integer, the arc-shaped grooves 24 are every other pair. One pole is configured; when the number of slots per pole and each phase is a fraction, the arc groove 24 is correspondingly configured for every other pole; the radius of the arc groove 24 is R1, and the relationship between R1 and L0 is: 0.95 L0≤R1≤1.5L0. The arc-shaped groove 24 is arranged to make the magnetic flux distribution smoother and to limit or reduce the output magnetic flux to a certain extent. The relationship between the width L0 is set to 0.95L0≤R1≤1.5L0, which can significantly improve the magnetic field concentration and reduce the high-order torque fluctuation of the motor.

The rotor is of a non-sloped pole structure and/or the stator is of a non-slanted-slot structure. The projections of the addendum grooves 14 on the sub in the axial direction are aligned. When the rotor is of a non-sloping pole structure, it can reduce the high-order noise of the motor at full load when the motor is running without the motor being inclined. When the stator is of a non-inclined slot structure, the spatial low-order components of the radial electromagnetic force components are reduced. The oblique pole oblique slot means that the slot is not aligned in the axial projection, and there is an angle between them. The non-inclined pole structure and the non-inclined groove structure here refer to the structure in which the grooves are aligned in the axial projection and there is no angle therebetween.

In this embodiment, the relational expression of the number of slots per pole and phase is:

s is the number of slots per pole per phase;

N is the number of stator punching slots;

P is the number of rotor punching pole pairs;

M is the number of phases.

In this embodiment, M=3.

In this embodiment, the magnet steel hole 23 includes a V-shaped first sub-magnet steel hole 231 and a second sub-magnet steel hole 232 .

In this embodiment, the first sub-magnetic steel hole 231 and the second sub-magnetic steel hole 232 have the same size. The process and cost increase problems caused by the use of large and small poles are avoided.

In this embodiment, the arrangement shape of the magnetic steel holes 23 is a "one" shape or a "V+one" shape or a "double V" shape.

In this embodiment, the addendum grooves 14 are symmetrical based on the tooth centerline.

In this embodiment, each pole corresponds to one magnet steel hole 23 , and the arc-shaped groove 24 is arranged on the center symmetry line between two adjacent magnet steel holes 23 . The distance between two adjacent magnet steel holes 23 is q.

In this embodiment, the circular substrate 21 is also uniformly arranged with weight-reducing holes 3 between the magnetic steel hole 23 and the shaft hole 22 .

In this embodiment, the weight-reducing hole 3 is triangular.

The permanent magnet rotating electrical machine of the present invention can reduce the spatial low-order components and high-order torque fluctuations in the radial electromagnetic force component under the condition that the rotor has no inclined poles or the stator has no inclined slots, and the production and manufacturing process of the electric machine is reduced. Difficulty and cost; the size of adjacent magnetic steel holes is completely consistent, avoiding the problem of process and cost increase caused by the use of large and small poles; The arc groove is used to reduce the high frequency torque fluctuation of the motor.

The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the prior art according to the concept of the present invention shall fall within the protection scope determined by the claims.

Claims (9)

1. A permanent magnet type rotating electrical machine, comprising a stator and a rotor, wherein the stator comprises a plurality of stator punches (1); the stator punches (1) comprise a yoke (11) and a magnetic A plurality of tooth parts (12) on the inner side of the yoke (11), the top surface of the tooth parts (12) is provided with a tooth top groove (14) for reducing electromagnetic force, and the groove of the tooth top groove (14) The width of the mouth is L3, and the width of the notch between the two adjacent teeth (12) is L0; the relationship between L3 and L0 is: 0.9L0≤L3≤1.1L0; The rotor includes a plurality of rotor punches (2), the rotor punches (2) include a circular substrate (21), and a shaft hole (22) is arranged in the center of the circular substrate (21), so The edge of the circular substrate (21) is uniformly arranged with a plurality of magnetic steel holes (23) along the circumferential direction, and the outer wall of the circular substrate (21) is provided with a plurality of arc-shaped recesses for reducing torque fluctuations Slots (24); when the number of slots per pole and phase is an integer, the arc-shaped grooves (24) are configured for every other pair of poles; when the number of slots per pole and phase is a fraction, the arc-shaped grooves (24) 24) One is arranged for every other pole; the radius of the arc groove (24) is R1, and the relationship between R1 and L0 is: 0.95L0≤R1≤1.5L0; The rotor is a non-sloping pole structure and/or the stator is a non-sloping-slot structure, and the non-sloping-pole structure refers to the axial projection of the arc-shaped grooves (24) on each rotor punch (2) is aligned, the non-inclined groove structure means that the projection of the addendum groove (14) on the specified sub in the axial direction is aligned. 2. The permanent magnet type rotating electrical machine according to claim 1, characterized in that, The relationship between the number of slots per pole and phase is:

s is the number of slots per pole per phase; N is the number of stator punching slots; P is the number of rotor punching pole pairs; M is the number of phases. 3 . The permanent magnet rotating electrical machine according to claim 1 , wherein the magnet steel hole ( 23 ) comprises a V-shaped first sub-magnet steel hole ( 231 ) and a second sub-magnet steel hole ( 232 ). 4 . ) . 4 . The permanent magnet rotating electrical machine according to claim 3 , wherein the first sub-magnet steel hole ( 231 ) and the second sub-magnet steel hole ( 232 ) have the same size. 5 . 5. The permanent magnet type rotating electrical machine according to claim 1, characterized in that, the arrangement shape of the magnetic steel holes (23) is a "one" shape or a "V+one" shape or a "double V" shape . 6 . The permanent magnet type rotating electrical machine according to claim 1 , wherein the tooth tip grooves ( 14 ) are symmetrical based on the tooth center line. 7 . 7. The permanent magnet rotating electrical machine according to claim 1 or 6, characterized in that, when the number of slots per pole and phase is an integer, each pole corresponds to a magnetic steel hole (23), and the arc groove (24) is arranged on the center symmetry line between two adjacent magnetic steel holes (23). 8 . The permanent magnet rotating electrical machine according to claim 1 , wherein the circular substrate ( 21 ) is also evenly arranged with weight-reducing holes ( 23 ) and the shaft hole ( 22 ). 3). 9 . The permanent magnet rotating electrical machine according to claim 8 , wherein the weight reduction hole ( 3 ) is triangular. 10 .

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