CN110994832A - An improved magnetic steel embedded motor - Google Patents
An improved magnetic steel embedded motor Download PDFInfo
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- CN110994832A CN110994832A CN201910989545.2A CN201910989545A CN110994832A CN 110994832 A CN110994832 A CN 110994832A CN 201910989545 A CN201910989545 A CN 201910989545A CN 110994832 A CN110994832 A CN 110994832A
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- rotor
- stator
- magnetic steel
- steel embedded
- embedded motor
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 36
- 239000010959 steel Substances 0.000 title claims abstract description 36
- 238000004804 winding Methods 0.000 claims abstract description 18
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 210000005056 cell body Anatomy 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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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
- H02K1/22—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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses an improved magnetic steel embedded motor which comprises a stator and a rotor, wherein a plurality of winding slots are formed in the circumferential direction of the stator, the rotor is installed in the center of the stator, and auxiliary slots are formed in the circumferential direction of the outer edge of the rotor, so that an uneven air gap is formed between the outer edge of the rotor and the stator; the tooth shoes on the two sides of the wire outlet of the winding groove of the stator are chamfered, so that the gap between the stator and the rotor gradually shrinks from the wire outlet to the two sides. Through the technical scheme that the auxiliary groove and the tooth boot chamfer angle are formed in the rotor, the noise of the magnetic steel embedded motor is reduced, the problems that the noise decibel of the existing magnetic steel embedded motor is high, the no-load working condition has squeaking sound from starting to the highest rotating speed and the like can be effectively improved, and the service life of the motor is prolonged.
Description
Technical Field
The invention relates to the field of power transmission of electric vehicles, and particularly discloses an improved magnetic steel embedded motor.
Background
Under the pressure of energy and environmental protection, new energy vehicles will undoubtedly become the development direction of vehicles in the future. While new energy vehicles are becoming more and more popular, improving their performance has become a major goal of many manufacturers, where reducing noise is one of the major goals of performance improvement. The motors used by common new energy vehicles are original magnetic steel embedded motors (figure 1) and magnetic steel surface-mounted motors (figure 2), the no-load noise of the motors is measured by using a handheld decibel meter, and the noise decibel of the embedded motors is found to be high, and the no-load working condition of the embedded motors has squeaking sound all the time from starting to the highest rotating speed.
Disclosure of Invention
The invention aims to provide an improved magnetic steel embedded motor, which solves the problem of high noise of the magnetic steel embedded motor.
The technical scheme adopted by the invention is as follows: an improved magnetic steel embedded motor comprises a stator and a rotor, wherein a plurality of winding slots are formed in the circumferential direction of the stator, the rotor is installed in the center of the stator, and auxiliary slots are formed in the circumferential direction of the outer edge of the rotor, so that an uneven air gap is formed between the outer edge of the rotor and the stator; the tooth shoes on the two sides of the wire outlet of the winding groove of the stator are chamfered, so that the gap between the stator and the rotor gradually shrinks from the wire outlet to the two sides.
Rotor circumference equipartition magnet steel embedded groove, two liang of magnet steel embedded grooves are a set of, two cell bodies of every group are the setting of V style of calligraphy, the centre of a circle of rotor is close to the one end that two cell bodies are close to each other, the one end of the directional rotor outer fringe of two cell bodies is separately state, and the outer fringe of the rotor that just corresponds sets up more than one arc auxiliary tank.
The total number of the auxiliary grooves is 10-30.
The winding groove is of a trapezoidal structure, a distance is reserved between the short edge of the winding groove and the inner edge of the stator, the wire outlet is formed in the middle of the short edge, the winding groove is communicated with the inner cavity of the stator, two symmetrical tooth shoes are formed on two sides of the wire outlet, the middle of the opposite surfaces of the pair of tooth shoes is obliquely cut towards the inner edge of the stator to form two oblique cutting surfaces, and the gap between the wire outlet and the rotor is increased.
The included angle between the two oblique cutting planes is 120-160 degrees.
The invention has the beneficial effects that: through the technical scheme that the auxiliary groove and the tooth boot chamfer angle are formed in the rotor, the noise of the magnetic steel embedded motor is reduced, the problems that the noise decibel of the existing magnetic steel embedded motor is high, the no-load working condition has squeaking sound from starting to the highest rotating speed and the like can be effectively improved, and the service life of the motor is prolonged.
Drawings
Fig. 1 is a schematic structural view of an original magnetic steel embedded motor.
Fig. 2 is a schematic structural diagram of a magnetic steel surface-mounted motor.
Fig. 3 is a schematic structural view of an improved magnetic steel embedded motor.
Fig. 4 is a partially enlarged view of fig. 3.
In the figure, 1, a stator, 2, a rotor, 3, a winding groove, 4, an outlet, 5, a tooth shoe, 5-1, an opposite surface, 6, a magnetic steel embedding groove and 7, an auxiliary groove.
Detailed Description
As shown in fig. 3 and 4, an improved magnetic steel embedded motor comprises a stator 1 and a rotor 2, wherein the stator 1 is circumferentially provided with a plurality of winding slots 3, the rotor 2 is installed at the center of the stator 1, and the outer edge of the rotor 2 is circumferentially provided with an auxiliary slot 7, so that an uneven air gap is formed between the outer edge of the rotor 2 and the stator 1; the tooth shoes 5 on both sides of the wire outlet 4 of the winding slot 3 of the stator 1 are chamfered, so that the gap between the stator 1 and the rotor 2 is gradually contracted from the wire outlet 4 to both sides.
2 circumference equipartition magnet steel embedded groove 6 of rotor, two liang a set of magnet steel embedded groove 6, two cell bodies of every group are the setting of V style of calligraphy, the centre of a circle of rotor 2 is close to the one end that two cell bodies are close to each other, the one end of the directional rotor 2 outer fringe of two cell bodies is separately-state, and the outer fringe of the rotor 2 that just corresponds sets up two arc auxiliary tank 7.
The winding groove 3 is of a trapezoidal structure, a distance is reserved between a short edge of the winding groove and the inner edge of the stator 1, the wire outlet 4 is formed in the middle of the short edge, the winding groove 3 is communicated with the inner cavity of the stator 1, two symmetrical tooth shoes 5 are formed on two sides of the wire outlet 4, the inner edge of the stator 1 is obliquely cut from the middle of the opposite surfaces 5-1 of the pair of tooth shoes 5 to form two oblique cutting surfaces, and the included angle a between the two oblique cutting surfaces is 120-160 degrees, so that the gap between the wire outlet and the rotor is increased. -
The scheme that the auxiliary groove 7 and the tooth shoe 5 chamfer angle are formed in the rotor 2 can be achieved through wire cutting punching. The improved magnetic steel embedded motor is compared with an original magnetic steel embedded motor (shown in figure 1) and a magnetic steel surface-mounted motor (shown in figure 2), and the three motors are subjected to comparative analysis such as torque fluctuation, cogging torque, no-load counter electromotive force harmonic wave, exciting force, electromagnetic force wave and the like, and the analysis working conditions are all carried out under the no-load working condition of rated rotating speed, so that the following conclusion is obtained:
the torque pulsation of the improved magnetic steel embedded motor under the rated working condition is reduced by 56.3 percent, and the average torque is reduced by 1.7 percent; under the no-load working condition: the cogging torque is reduced by 54.4%; the amplitude of the back electromotive force is reduced by 3.3%; the proportion of counter electromotive force 5 subharmonic is reduced by 13.7%, and the proportion of 7 subharmonic is increased by 388.2%; the peak value of the exciting force is reduced by 13.2 percent, and the effective value is reduced by 0.73 percent; the comparison shows that the technical scheme of the invention has obvious optimization effect on the parameters of torque ripple and cogging torque, and has the optimization effect reduced by 50% compared with the original magnetic steel embedded motor and magnetic steel surface-mounted motor;
according to the electromagnetic simulation result of the radial force wave, the peak value and the effective value of the force wave are reduced, and the vibration noise under the no-load working condition of the whole machine is reduced to a certain extent;
from the harmonic analysis result of the radial force wave, the amplitude of the force wave harmonic of the order of 416.7Hz 10 is reduced to some extent, and the vibration noise of the whole machine under the no-load working condition can be reduced to a certain extent, but the amplitude of the force wave harmonic of the order of 1262Hz 30 is increased, the frequency of the force wave harmonic is higher, and the vibration noise of the whole machine is not easily caused.
Claims (6)
1. An improved magnetic steel embedded motor is characterized by comprising a stator and a rotor, wherein a plurality of winding slots are formed in the circumferential direction of the stator, the rotor is installed in the center of the stator, and auxiliary slots are formed in the circumferential direction of the outer edge of the rotor, so that an uneven air gap is formed between the outer edge of the rotor and the stator; the tooth shoes on the two sides of the wire outlet of the winding groove of the stator are chamfered, so that the gap between the stator and the rotor gradually shrinks from the wire outlet to the two sides.
2. The improved magnetic steel embedded motor according to claim 1, wherein the magnetic steel embedded grooves are uniformly distributed in the circumferential direction of the rotor, the magnetic steel embedded grooves are grouped in pairs, two groove bodies of each group are arranged in a V shape, one ends of the two groove bodies, which are close to each other, are close to the center of the rotor, one ends of the two groove bodies, which point to the outer edge of the rotor, are in a separated state, and arc-shaped auxiliary grooves are formed in the corresponding outer edge of the rotor.
3. An improved magnetic steel embedded motor according to claim 1, wherein two auxiliary grooves are arranged on the outer edge of each set of rotors, and a distance is reserved between the two auxiliary grooves.
4. The improved magnetic steel embedded motor according to claim 1, wherein the total number of the auxiliary grooves is 10-30.
5. An improved magnetic steel embedded motor as claimed in claim 1, wherein said winding slot is trapezoidal in structure, a distance is left between the short side of the winding slot and the inner edge of the stator, the outlet is opened in the middle of the short side to connect the winding slot with the inner cavity of the stator, two symmetrical tooth shoes are formed on both sides of the outlet, and the two tooth shoes are obliquely cut from the middle of the opposite surfaces of the pair of tooth shoes to the inner edge of the stator to form two oblique cutting surfaces, so that the gap between the outlet and the rotor is increased.
6. An improved magnetic steel embedded motor as claimed in claim 4, wherein the included angle between the two oblique cutting planes is 120-160 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910989545.2A CN110994832A (en) | 2019-10-17 | 2019-10-17 | An improved magnetic steel embedded motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910989545.2A CN110994832A (en) | 2019-10-17 | 2019-10-17 | An improved magnetic steel embedded motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110994832A true CN110994832A (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910989545.2A Pending CN110994832A (en) | 2019-10-17 | 2019-10-17 | An improved magnetic steel embedded motor |
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| Country | Link |
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| CN (1) | CN110994832A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008099418A (en) * | 2006-10-11 | 2008-04-24 | Matsushita Electric Ind Co Ltd | Permanent magnet embedded motor |
| CN105553143A (en) * | 2016-02-25 | 2016-05-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor iron core and permanent magnet synchronous motor with same |
| CN205986394U (en) * | 2016-09-05 | 2017-02-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent -magnet machine and compressor |
| CN106451849A (en) * | 2016-10-13 | 2017-02-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor structure, motor and compressor |
| CN107222046A (en) * | 2017-08-09 | 2017-09-29 | 珠海格力节能环保制冷技术研究中心有限公司 | Tangential motor and tangential rotor |
| 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 |
| CN211183571U (en) * | 2019-10-17 | 2020-08-04 | 徐州南普机电科技有限公司 | Improved magnetic steel embedded motor |
-
2019
- 2019-10-17 CN CN201910989545.2A patent/CN110994832A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008099418A (en) * | 2006-10-11 | 2008-04-24 | Matsushita Electric Ind Co Ltd | Permanent magnet embedded motor |
| CN105553143A (en) * | 2016-02-25 | 2016-05-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor iron core and permanent magnet synchronous motor with same |
| CN205986394U (en) * | 2016-09-05 | 2017-02-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent -magnet machine and compressor |
| CN106451849A (en) * | 2016-10-13 | 2017-02-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor structure, motor and compressor |
| CN107222046A (en) * | 2017-08-09 | 2017-09-29 | 珠海格力节能环保制冷技术研究中心有限公司 | Tangential motor and tangential rotor |
| 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 |
| CN211183571U (en) * | 2019-10-17 | 2020-08-04 | 徐州南普机电科技有限公司 | Improved magnetic steel embedded motor |
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