CN111555482A - Permanent magnet type rotating motor - Google Patents
Permanent magnet type rotating motor Download PDFInfo
- Publication number
- CN111555482A CN111555482A CN202010472432.8A CN202010472432A CN111555482A CN 111555482 A CN111555482 A CN 111555482A CN 202010472432 A CN202010472432 A CN 202010472432A CN 111555482 A CN111555482 A CN 111555482A
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- Prior art keywords
- pole
- permanent magnet
- arc
- rotor
- grooves
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
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
Technical Field
The invention relates to the technical field of new energy drive motors, in particular to a permanent magnet type rotating motor.
Background
Recently, under the influence of market investment of Hybrid Electric Vehicles (HEV) and Electric Vehicles (EV) brought by electrification, the demand and usage amount of a high-rotation-speed driving motor are increased sharply, the driving motor is used as a main driving power source of the Electric Vehicles (EV) or the Hybrid Electric Vehicles (HEV), and in order to prevent discomfort of a driver and passengers, a strict requirement is also imposed on noise design of the motor, and it is found through analysis that a driving motor noise source includes mechanical noise and electromagnetic noise, and the mechanical noise is mainly caused by vibration of mechanical parts such as a bearing and modal problems of the motor itself; electromagnetic noise is mainly caused by the combination of torque ripple and radial force wave inside the motor, and the torque ripple is related to the shape of the rotor, the length of the air gap and the natural frequency of the motor. Since torque ripple (torque ripple) during high-speed operation generates a large noise, it is necessary to reduce the torque waveform of the drive motor.
Disclosure of Invention
The invention aims to provide a permanent magnet type rotating motor which can reduce low-order components and high-order torque fluctuation in space in radial electromagnetic force components and reduce the difficulty and cost of a motor production and manufacturing process under the condition that a rotor does not have an oblique pole or a stator does not have an oblique slot.
In order to achieve the above object, the present invention provides a permanent magnet type rotating electrical machine, comprising a stator and a rotor, wherein the stator comprises a plurality of stator punching sheets; 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 used for reducing electromagnetic force 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; the relationship between L3 and L0 is: 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 arranged in the edge of the circular substrate along the circumferential direction, and a plurality of arc-shaped grooves used for reducing torque fluctuation 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, and the relation between R1 and L0 is as follows: r1 is more than or equal to 0.95L0 and less than or equal to 1.5L 0;
the rotor is of a non-oblique-pole structure and/or the stator is of a non-oblique-slot structure, the non-oblique-pole structure means that projections of arc-shaped grooves on each rotor punching sheet in the axial direction are aligned, and the non-oblique-slot structure means that projections of tooth crest grooves on the stator in the axial direction are aligned.
Further, the relation of the number of slots per phase per pole is as follows:
s is the number of slots per pole and phase;
n is the number of slots of the stator punching sheet;
p is the number of pole pairs of the rotor punching sheet;
m is the number of phases.
Furthermore, the magnetic steel hole comprises a V-shaped first sub magnetic steel hole and a V-shaped second sub magnetic steel hole.
Further, the first sub magnetic steel hole and the second sub magnetic steel hole are the same in size.
Further, the arrangement shape of the magnetic steel holes is in a shape of a straight line, a V + straight line or a double V.
Further, the tooth top groove is symmetrical based on the tooth center line.
Furthermore, each pole corresponds to a magnetic steel hole, and the arc-shaped groove is arranged on a central symmetry line between two adjacent magnetic steel holes.
Furthermore, lightening holes are uniformly distributed on the circular substrate between the magnetic steel holes and the shaft holes.
Further, the lightening holes are triangular.
Compared with the prior art, the invention has the following advantages:
the permanent magnet type rotating motor can reduce low-order components and high-order secondary torque fluctuation in space in radial electromagnetic force components under the condition that a rotor does not have an oblique pole and/or a stator does not have an oblique slot, and the difficulty and the cost of a motor production and manufacturing process are reduced; the sizes of the adjacent magnetic steel holes are completely kept consistent, so that the problems of process and cost increase caused by the adoption of large and small poles are solved; according to the difference of the number of grooves of each phase of each pole, the outer wall of the motor rotor is provided with arc-shaped grooves with different numbers, so that the high-frequency torque fluctuation of the motor is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a rotor sheet in a permanent magnet rotating electrical machine according to an embodiment of the present invention;
FIG. 2 is a partial view of FIG. 1;
fig. 3 is a schematic structural diagram of a stator punching sheet in a permanent magnet type rotating electrical machine according to an embodiment of the present invention;
FIG. 4 is a partial view of FIG. 3;
fig. 5 is a torque fluctuation tendency diagram of the permanent magnet type electric rotating machine of the present invention;
fig. 6 is a diagram showing a trend of the electromagnetic force of the permanent magnet type rotating electric machine according to the present invention.
In the figure:
1-stator punching sheet, 11-magnet yoke, 12-tooth part and 14-tooth top groove; 2-rotor punching sheet, 21-circular substrate, 22-shaft hole, 23-magnetic steel hole, 231-first sub-magnetic steel hole, 232-second sub-magnetic steel hole and 24-arc groove; and 3-lightening holes.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Referring to fig. 1 to 6, the present embodiment discloses a permanent magnet type rotating electrical machine, which includes a stator and a rotor, wherein the stator includes a plurality of stator laminations 1; the stator punching sheet 1 comprises a magnetic yoke 11 and a plurality of tooth parts 12 arranged on the inner side of the magnetic yoke 11, tooth top grooves 14 for reducing electromagnetic force are arranged on the top surfaces of the tooth parts 12, the width of a notch of each tooth top groove 14 is L3, and the width of a notch between every two adjacent tooth parts 12 is L0; the relationship between L3 and L0 is: l3 is more than or equal to 0.9L0 and less than or equal to 1.1L 0. One of the problems associated with permanent magnet type rotating electric machines is that noise is generated due to electromagnetic force. The arrangement of the tooth tip groove 14 can change the direction of the generated magnetic field, balance the distribution of magnetic lines of force of the tooth part of the stator punching sheet of the motor, namely smooth the distribution of magnetic flux in an air gap, and improve the order of electromagnetic force, so that the amplitude of the electromagnetic force can be reduced. In order to smooth the flux distribution in the air gap, the flux entering from the top of each tooth 12 must be limited or reduced to some extent. For this application, to reduce the electromagnetic forces, it is common to increase the reluctance of the top of each tooth 12, i.e. away from the air gap. The relation between the notch width L3 of the tooth top groove and the notch width L0 between two adjacent tooth parts 12 is set to be 0.9L 0-1.1L 0, so that the magnetic field concentration can be obviously improved, the electromagnetic force and the cogging torque order are improved, and the full-load low-order and low-load high-order noise during the operation of the motor is further reduced.
The rotor comprises a plurality of rotor laminations 2, each rotor lamination 2 comprises a circular substrate 21, a shaft hole 22 is formed in the center of each circular substrate 21, a plurality of magnetic steel holes 23 are uniformly formed in the edge of each circular substrate 21 along the circumferential direction, and a plurality of arc-shaped grooves 24 for reducing torque fluctuation are formed in the outer wall of each circular substrate 21; when the number of slots of each phase of each pole is an integer, the arc-shaped grooves 24 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 24 are correspondingly configured for every other pole; the radius of the arc-shaped groove 24 is R1, and the relation between R1 and L0 is as follows: r1 is more than or equal to 0.95L0 and less than or equal to 1.5L 0. The arc-shaped groove 24 is arranged, so that the magnetic flux distribution is smoother, the output magnetic flux is limited or reduced to a certain degree, the relation between the radius of the arc-shaped groove 24, namely R1, and the width of a notch between every two adjacent tooth parts 12, namely L0, is set to be 0.95L0 or more and R1 or more and 1.5L0 or less, the magnetic field concentration can be obviously improved, and the high-order torque fluctuation of the motor is reduced.
The rotor is in a non-skewed pole structure and/or the stator is in a non-skewed slot structure, the non-skewed pole structure means that projections of the arc-shaped grooves 24 on the rotor punching sheets 2 in the axial direction are aligned, and the non-skewed slot structure means that projections of the tooth crest grooves 14 on the stator in the axial direction are aligned. When the rotor is in a non-oblique pole structure, the full-load high-order noise generated when the motor runs can be reduced under the condition that the motor is not in an oblique pole. When the stator is in a non-skewed slot structure, the low-order components in space in the radial electromagnetic force components are reduced. The oblique inclined slots mean that the slots are not aligned in axial projection, and an angle exists between the slots. The non-skewed polar structure and the non-skewed slot structure refer to a structure in which slots are aligned in an axial projection and no angle exists between the slots.
In this embodiment, the relationship of the number of slots per phase per pole is:
s is the number of slots per pole and phase;
n is the number of slots of the stator punching sheet;
p is the number of pole pairs of the rotor punching sheet;
m is the number of phases.
In the present embodiment, M is 3.
In this embodiment, the magnetic steel hole 23 includes a first sub magnetic steel hole 231 and a second sub magnetic steel hole 232 in a V shape.
In this embodiment, the first sub magnetic steel hole 231 and the second sub magnetic steel hole 232 have the same size. The problems of process and cost increase caused by adopting large and small electrodes are avoided.
In the present embodiment, the arrangement shape of the magnetic steel holes 23 is a line shape, a V + line shape, or a double V shape.
In the present embodiment, the tooth top groove 14 is symmetrical based on the tooth center line.
In the present embodiment, each pole corresponds to one magnet steel hole 23, and the arc-shaped groove 24 is disposed on the central symmetry line between two adjacent magnet steel holes 23. The distance between two adjacent magnetic steel holes 23 is q.
In the present embodiment, the circular substrate 21 is further uniformly provided with lightening holes 3 between the magnetic steel holes 23 and the shaft hole 22.
In the present embodiment, the lightening holes 3 are triangular.
The permanent magnet type rotating motor can reduce low-order components and high-order secondary torque fluctuation in space in radial electromagnetic force components under the condition that a rotor does not have an oblique pole or a stator does not have an oblique slot, and the difficulty and the cost of a motor production and manufacturing process are reduced; the sizes of the adjacent magnetic steel holes are completely kept consistent, so that the problems of process and cost increase caused by the adoption of large and small poles are solved; according to the difference of the number of grooves of each phase of each pole, the outer circle of the motor rotor punching sheet is provided with arc-shaped grooves with different numbers, so that the high-frequency torque fluctuation of the motor is reduced.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. A permanent magnet type rotating motor comprises a stator and a rotor, and is characterized in that the stator comprises a plurality of stator punching sheets (1); the stator punching sheet (1) comprises a magnetic yoke (11) and a plurality of tooth parts (12) arranged on the inner side of the magnetic yoke (11), tooth top grooves (14) used for reducing electromagnetic force are formed in the top surfaces of the tooth parts (12), the width of a notch of each tooth top groove (14) is L3, and the width of a notch between every two adjacent tooth parts (12) is L0; the relationship between L3 and L0 is: 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 (2), each rotor punching sheet (2) comprises a circular substrate (21), a shaft hole (22) is formed in the center of each circular substrate (21), a plurality of magnetic steel holes (23) are uniformly formed in the edge of each circular substrate (21) along the circumferential direction, and a plurality of arc-shaped grooves (24) used for reducing torque fluctuation are formed in the outer wall of each circular substrate (21); when the number of the grooves of each phase of each pole is an integer, the arc-shaped grooves (24) 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 (24) are correspondingly configured for every other pole; the radius of the arc-shaped groove (24) is R1, and the relation between R1 and L0 is as follows: r1 is more than or equal to 0.95L0 and less than or equal to 1.5L 0;
the rotor is of a non-oblique-pole structure and/or the stator is of a non-oblique-slot structure, the non-oblique-pole structure means that projections of arc-shaped grooves (24) on each rotor punching sheet (2) in the axial direction are aligned, and the non-oblique-slot structure means that projections of tooth crest grooves (14) on the stator in the axial direction are aligned.
2. A permanent magnet type electric rotating machine according to claim 1,
the relation of the number of slots per pole and phase is as follows:
s is the number of slots per pole and phase;
n is the number of slots of the stator punching sheet;
p is the number of pole pairs of the rotor punching sheet;
m is the number of phases.
3. A permanent magnet type rotating electric machine according to claim 1, wherein said magnet steel hole (23) comprises a first sub magnet steel hole (231) and a second sub magnet steel hole (232) in a V-shape.
4. A permanent magnet rotating electric machine according to claim 3, wherein the first sub-magnet steel hole (231) and the second sub-magnet steel hole (232) are the same size.
5. A permanent magnet type electric rotating machine according to claim 1, wherein the arrangement shape of the magnetic steel holes (23) is a line shape or a V + line shape or a double V shape.
6. A permanent magnet rotating electric machine according to claim 1, characterized in that the tooth top groove (14) is symmetrical based on a tooth center line.
7. A permanent magnet rotary electric machine according to claim 1 or 6, wherein when the number of slots per phase per pole is an integer, one magnet steel hole (23) is provided for each pole, and the arc-shaped groove (24) is provided on a central symmetry line between two adjacent magnet steel holes (23).
8. A permanent magnet rotating machine according to claim 1, characterized in that said circular base plate (21) is further provided with lightening holes (3) uniformly arranged between the magnet steel holes (23) and the shaft hole (22).
9. A permanent magnet rotating machine according to claim 8, characterized in that said lightening holes (3) are triangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010472432.8A CN111555482A (en) | 2020-05-29 | 2020-05-29 | Permanent magnet type rotating motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010472432.8A CN111555482A (en) | 2020-05-29 | 2020-05-29 | Permanent magnet type rotating motor |
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| Publication Number | Publication Date |
|---|---|
| CN111555482A true CN111555482A (en) | 2020-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010472432.8A Pending CN111555482A (en) | 2020-05-29 | 2020-05-29 | Permanent magnet type rotating motor |
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| CN (1) | CN111555482A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001145284A (en) * | 1997-09-29 | 2001-05-25 | Hitachi Ltd | Permanent magnet rotary electric machine and electric train using the same |
| CN102810965A (en) * | 2012-07-19 | 2012-12-05 | 春城控股集团有限公司 | Brushless permanent magnet direct current motor with windings on sunken skewed slots reserved on crowns of stator and rotor |
| CN103746473A (en) * | 2014-01-13 | 2014-04-23 | 广东美芝精密制造有限公司 | Motor for compressor and compressor with motor |
| CN204886463U (en) * | 2015-07-23 | 2015-12-16 | 珠海凌达压缩机有限公司 | Motor rotor structure, permanent magnet motor and compressor |
| CN105281459A (en) * | 2015-07-23 | 2016-01-27 | 珠海格力电器股份有限公司 | Motor rotor structure, permanent magnet motor and compressor |
| CN106712425A (en) * | 2017-03-09 | 2017-05-24 | 广东志高精密机械有限公司 | Permanent magnet synchronous motor for compressor |
| CN108110927A (en) * | 2017-12-29 | 2018-06-01 | 上海崇林汽车电子有限公司 | A kind of electric vehicle permanent magnet motor rotor punching |
| CN208272722U (en) * | 2018-05-16 | 2018-12-21 | 湖州越球电机有限公司 | A kind of refrigerator inner-rotor brushless DC motor stator lamination structure |
| CN109921571A (en) * | 2019-01-31 | 2019-06-21 | 广州小鹏汽车科技有限公司 | A kind of motor and automobile for inhibiting motor electromagnetic noise and improving NVH |
-
2020
- 2020-05-29 CN CN202010472432.8A patent/CN111555482A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001145284A (en) * | 1997-09-29 | 2001-05-25 | Hitachi Ltd | Permanent magnet rotary electric machine and electric train using the same |
| CN102810965A (en) * | 2012-07-19 | 2012-12-05 | 春城控股集团有限公司 | Brushless permanent magnet direct current motor with windings on sunken skewed slots reserved on crowns of stator and rotor |
| CN103746473A (en) * | 2014-01-13 | 2014-04-23 | 广东美芝精密制造有限公司 | Motor for compressor and compressor with motor |
| CN204886463U (en) * | 2015-07-23 | 2015-12-16 | 珠海凌达压缩机有限公司 | Motor rotor structure, permanent magnet motor and compressor |
| CN105281459A (en) * | 2015-07-23 | 2016-01-27 | 珠海格力电器股份有限公司 | Motor rotor structure, permanent magnet motor and compressor |
| CN106712425A (en) * | 2017-03-09 | 2017-05-24 | 广东志高精密机械有限公司 | Permanent magnet synchronous motor for compressor |
| CN108110927A (en) * | 2017-12-29 | 2018-06-01 | 上海崇林汽车电子有限公司 | A kind of electric vehicle permanent magnet motor rotor punching |
| CN208272722U (en) * | 2018-05-16 | 2018-12-21 | 湖州越球电机有限公司 | A kind of refrigerator inner-rotor brushless DC motor stator lamination structure |
| CN109921571A (en) * | 2019-01-31 | 2019-06-21 | 广州小鹏汽车科技有限公司 | A kind of motor and automobile for inhibiting motor electromagnetic noise and improving NVH |
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Application publication date: 20200818 |
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