CN112152411A - Three-phase brushless permanent magnet direct current motor - Google Patents
Three-phase brushless permanent magnet direct current motor Download PDFInfo
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- CN112152411A CN112152411A CN201910982653.7A CN201910982653A CN112152411A CN 112152411 A CN112152411 A CN 112152411A CN 201910982653 A CN201910982653 A CN 201910982653A CN 112152411 A CN112152411 A CN 112152411A
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- air gap
- tooth
- center
- phase brushless
- brushless permanent
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Brushless Motors (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a three-phase brushless permanent magnet direct current motor which is characterized by comprising a shell, wherein a stator assembly, a rotor assembly and a control circuit board are arranged in the shell; the stator assembly comprises a stator core, a plastic framework wrapping the stator core and a coil wound on the plastic framework; the rotor assembly comprises a multi-pole magnet, a rotor framework and a rotating shaft; the front and the rear of the rotor component are provided with shaft sleeves on the rotating shaft; the stator core is provided with a yoke part and a plurality of same tooth parts extending from the yoke part to the center direction, the tooth parts are in an arc shape, and a notch air gap and a tooth center air gap are arranged between the tooth parts and the multi-stage magnets; the eccentric distance A exists between the circle center of the circle corresponding to the arc of the tooth part and the center of the rotor assembly, so that the size of the notch air gap is different from that of the tooth center air gap, the cogging torque can be effectively weakened, the motor can generate a magnetic concentration effect when working, and the waveform of a magnetic field is the magnetic field density of a sine wave.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of motors, in particular to a three-phase brushless permanent magnet direct current motor.
[ background of the invention ]
With the development of science and technology, three-phase brushless permanent magnet direct current motors are increasingly applied to household appliances. In the specification of household appliances, noise is an important index. The existing three-phase brushless direct current motor adopts a structure that an air gap between a stator assembly and a rotor assembly is uniform. Such structures exist: the motor has the defects of large cogging torque, large torque fluctuation, poor matching degree of magnetic field density waveform and driving current waveform and the like, so that the motor is large in vibration and noise, and the use experience of consumers is greatly influenced. In order to solve the problems, a motor with small cogging torque, small torque fluctuation, good matching degree of magnetic field density waveform and driving current waveform, small vibration and small noise is developed.
[ summary of the invention ]
The invention aims to overcome the defects of large cogging torque, large torque fluctuation, poor matching degree of magnetic field density waveform and driving current waveform, large vibration, large noise and the like of a motor, and provides a motor with small cogging torque, small torque fluctuation, good matching degree of magnetic field density waveform and driving current waveform, small vibration and small noise.
In order to solve the above problems, the present invention provides the following technical solutions:
the invention provides a three-phase brushless permanent magnet direct current motor which is characterized by comprising a shell, wherein a stator assembly, a rotor assembly and a control circuit board are arranged in the shell; the stator assembly comprises a stator core, a plastic framework wrapping the stator core and a coil wound on the plastic framework; the rotor assembly comprises a multi-pole magnet, a rotor framework and a rotating shaft; the front and the rear of the rotor component are provided with shaft sleeves on the rotating shaft; the stator core is provided with a yoke part and a plurality of same tooth parts extending from the yoke part to the center direction, the tooth parts are in an arc shape, and a notch air gap and a tooth center air gap are arranged between the tooth parts and the multi-stage magnets; the center of the circle corresponding to the arc of the tooth part and the center of the rotor assembly have an eccentric distance A, so that the size of the notch air gap is not consistent with that of the tooth center air gap, and the motor generates a magnetic field density with a sine wave shape when working.
The three-phase brushless permanent magnet direct current motor is characterized in that the range of the eccentricity A is as follows: a > 0.
The three-phase brushless permanent magnet direct current motor is characterized in that the notch air gap is the distance from the center of the connecting line of the arc end points of the adjacent tooth parts to the multi-stage magnets, and the tooth center air gap is the distance from the center of the arc of the tooth parts to the multi-stage magnets.
The three-phase brushless permanent magnet direct current motor is characterized in that the ratio range of the notch air gap to the tooth center air gap is as follows: 1.1-10.
The three-phase brushless permanent magnet direct current motor is characterized in that the winding form of the coil of the stator assembly is fractional slot concentrated winding, the connection method of the three-phase winding of the stator assembly is Y-shaped or triangular, and the winding form of each phase winding is series connection or parallel connection or multi-strand parallel winding.
The three-phase brushless permanent magnet direct current motor is characterized in that the control circuit board is driven by inputting sine wave current, and the input sine wave current is matched with the waveform of the magnetic field density.
The three-phase brushless permanent magnet direct current motor is characterized in that the shell is made of engineering plastics or integrally plastic-coated stators or other materials.
The three-phase brushless permanent magnet direct current motor is characterized in that the multi-pole magnet is a ring magnet or a block magnet attached to a rotor framework or other magnet structures.
The three-phase brushless permanent magnet direct current motor is characterized in that the multi-pole magnet is made of ferrite or neodymium iron boron; the forming mode is sintering or injection molding or bonding or hot extrusion.
The three-phase brushless permanent magnet direct current motor is characterized in that a damping ring is arranged between the shell and the shaft sleeve.
The invention has the following advantages:
1. according to the three-phase brushless permanent magnet direct current motor, the eccentricity A exists between the circle center of the circle corresponding to the arc of the tooth part of the stator core and the center of the rotor assembly, and the notch air gap is larger than the tooth center air gap, so that the cogging torque and the torque fluctuation are reduced, the vibration of the motor is reduced, the noise is reduced, and the motor is more silent.
2. According to the three-phase brushless permanent magnet direct current motor, when sine wave current is adopted for driving, the waveform of the generated magnetic field density is matched with the waveform of the driving current, and when square wave current is adopted for driving, the cogging torque can be effectively weakened, so that the torque fluctuation can be reduced, the motor vibration can be reduced, and the motor is more silent.
3. The three-phase brushless permanent magnet direct current motor is characterized in that the damping ring is arranged between the shell and the shaft sleeve, and the damping ring 8 can effectively reduce the vibration of the motor and is beneficial to reducing the noise of the motor
4. The three-phase brushless permanent magnet direct current motor is convenient to process and manufacture and beneficial to saving production cost.
[ description of the drawings ]
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of a stator core and rotor assembly in accordance with an embodiment of the present invention;
fig. 3 is a schematic view of a stator core and rotor assembly according to an embodiment of the present invention.
[ detailed description ] embodiments
With reference to fig. 1 to 3, the present invention provides a three-phase brushless permanent magnet dc motor, which is characterized in that the three-phase brushless permanent magnet dc motor comprises a housing 1, wherein a stator assembly 2, a rotor assembly 3 and a control circuit board 4 are arranged inside the housing 1; the stator assembly comprises a stator core 21, a plastic framework 22 wrapping the stator core, and a coil 23 wound on the plastic framework 22; the rotor assembly 3 comprises a multi-pole magnet 31, a rotor framework 32 and a rotating shaft 33; the rotating shaft 33 is provided with shaft sleeves 5 at the front and the rear of the rotor assembly; the stator core 21 is provided with a yoke part 211 and a plurality of same tooth parts 212 extending from the yoke part 211 to the center direction, the tooth parts 212 are arc-shaped, and a notch air gap 6 and a tooth center air gap 7 are arranged between the tooth parts 212 and the multi-stage magnet 31; the eccentric distance A exists between the circle center of the circle corresponding to the arc of the tooth part 212 and the center of the rotor assembly 3, so that the size of the notch air gap 6 is different from that of the tooth center air gap 7, the magnetic field density with a sine wave shape is generated when the motor works, the cogging torque can be better weakened, and the magnetic convergence effect is generated; due to the existence of the eccentricity A, an air gap between the stator assembly 2 and the rotor assembly 3 is not uniform, the value of the notch air gap 6 is larger than the value of the tooth center air gap 7, the cogging torque is favorably reduced, the torque fluctuation is favorably reduced, the vibration and the noise of the motor are favorably reduced, the generation of the magnetic field density of sine wave waveforms is favorably realized, the waveform of the magnetic field density is matched with the waveform of the current of the driving motor, and the motor is more silent.
The invention relates to a three-phase brushless permanent magnet direct current motor, the range of the eccentricity A is as follows: a is greater than 0, in the first embodiment, the center of a circle corresponding to the arc of the tooth portion of the stator core 21 is located below the center of the rotor assembly 3; in the second embodiment, the center of the circle corresponding to the arc of the tooth portion of the stator core 21 is located above the center of the rotor assembly 3.
One of the preferable modes of the present invention is that the notch air gap 6 is the distance from the center of the connecting line of the arc end points of the adjacent tooth portions 212 to the multistage magnet 31, the tooth center air gap 7 is the distance from the center of the arc of the tooth portions 212 to the multistage magnet 31, and the notch air gap is larger than the tooth center air gap, which is beneficial to reducing the cogging torque and the torque fluctuation, reducing the vibration and noise of the motor, and generating the magnetic field density of sine wave shape, so that the waveform of the magnetic field density is matched with the waveform of the current of the driving motor, and the motor is more silent.
One of the preferred modes of the invention is that the ratio range of the notch air gap 6 to the tooth center air gap 7 is as follows: 1.1-10, which is convenient for generating sine wave magnetic field density, effectively weakens the cogging torque, enables the waveform of the magnetic field density to be matched with the waveform of the current of the driving motor, and enables the motor to be more silent.
The winding form of the coil 23 of the stator assembly 2 in one of the preferred modes of the invention is fractional slot concentrated winding, the three-phase winding of the stator assembly 2 is connected in a Y shape or a triangle shape, the winding form of each phase winding is in series connection or in parallel connection or in multi-strand parallel winding, and the winding forms are various and are convenient to produce and process.
One of the preferable modes of the invention is that the control circuit board 4 inputs sine wave current drive or square wave current drive, the input sine wave current is matched with the waveform of the magnetic field density, the wave crest and the wave trough of the sine wave current waveform are synchronous with the positions of the wave crest and the wave trough of the magnetic field density waveform, when the input is square wave current, the cogging torque fluctuation can be effectively weakened, the torque fluctuation can be reduced, the motor vibration can be reduced, and the motor can be more silent.
One of the preferable modes of the invention is that the shell 1 is made of engineering plastics or stator integral plastic coating or other materials, so that the manufacturing cost is saved on the premise of meeting the use strength of the motor, and the industrial production is facilitated.
In a preferred embodiment of the present invention, the multipole magnet 31 is a ring magnet, a block magnet attached to the rotor frame 32, or another type of magnet structure, and the multipole magnet 31 is easily manufactured by various types of selection.
In a preferred embodiment of the present invention, the material of the multipolar magnet 31 is ferrite or neodymium iron boron; the molding mode is sintering or injection molding or bonding or hot extrusion, and the material selection and the molding mode of the multi-pole magnet are various, thereby being convenient for processing and manufacturing.
One of the preferable modes of the invention is that a damping ring 8 is arranged between the shell 1 and the shaft sleeve 5, and the shaft sleeve can be a rolling bearing or an oil-containing bearing, which is beneficial to reducing friction; the damping ring 8 can effectively reduce the vibration of the motor, and is favorable for reducing the noise of the motor.
Claims (10)
1. A three-phase brushless permanent magnet direct current motor is characterized by comprising a shell (1), wherein a stator assembly (2), a rotor assembly (3) and a control circuit board (4) are arranged in the shell (1); the stator assembly comprises a stator core (21), a plastic framework (22) wrapping the stator core and a coil (23) wound on the plastic framework (22); the rotor assembly (3) comprises a multi-pole magnet (31), a rotor framework (32) and a rotating shaft (33); the rotating shaft (33) is provided with shaft sleeves (5) at the front and the rear of the rotor assembly; the stator core (21) is provided with a yoke part (211) and a plurality of identical tooth parts (212) extending from the yoke part (211) to the center direction, the tooth parts (212) are arc-shaped, and a notch air gap (6) and a tooth center air gap (7) are arranged between the tooth parts (212) and the multi-stage magnets (31); the eccentricity A exists between the circle center of the circle corresponding to the arc of the tooth part (212) and the center of the rotor assembly (3), so that the size of the notch air gap (6) is different from that of the tooth center air gap (7), and the magnetic field density with a sine wave shape is generated when the motor works.
2. A three-phase brushless permanent magnet dc motor according to claim 1, wherein the eccentricity a is in the range: a > 0.
3. A three-phase brushless permanent magnet dc motor according to claim 1, wherein the slot air gap (6) is a distance from a center of a line connecting end points of arcs of adjacent tooth portions (212) to the multi-stage magnets (31), and the tooth center air gap (7) is a distance from a center of an arc of a tooth portion (212) to the multi-stage magnets (31).
4. A three-phase brushless permanent magnet dc motor according to claim 1, characterized in that the ratio of slot air gap (6) to tooth center air gap (7) ranges: 1.1-10.
5. A three-phase brushless permanent magnet dc motor according to claim 1, wherein the winding of the coils (23) of the stator assembly (2) is fractional slot concentrated winding, the three-phase winding of the stator assembly (2) is Y-shaped or triangular, and each phase winding is wound in series or in parallel or in multi-phase parallel.
6. A three-phase brushless permanent magnet dc motor according to claim 1, wherein the control circuit board (4) is driven by a sine wave current or a square wave current, and the sine wave current is matched with the waveform of the magnetic field density; when the input of the device is square wave current, the cogging torque fluctuation can be effectively weakened.
7. A three-phase brushless permanent-magnet direct current motor according to claim 1, characterized in that the material of the housing (1) is engineering plastic or stator plastic-coated or other material.
8. A three-phase brushless permanent magnet dc motor according to claim 1, characterized in that the multipole magnet (31) is a ring magnet or a block magnet or other form of magnet structure attached to the rotor frame (32).
9. A three-phase brushless permanent magnet direct current motor according to claim 8, characterized in that the material of said multi-pole magnets (31) is ferrite or neodymium iron boron; the forming mode is sintering or injection molding or bonding or hot extrusion.
10. A three-phase brushless permanent-magnet direct current motor according to claim 1, characterized in that a damping ring (8) is provided between the housing (1) and the shaft sleeve (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910982653.7A CN112152411A (en) | 2019-10-16 | 2019-10-16 | Three-phase brushless permanent magnet direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910982653.7A CN112152411A (en) | 2019-10-16 | 2019-10-16 | Three-phase brushless permanent magnet direct current motor |
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| Publication Number | Publication Date |
|---|---|
| CN112152411A true CN112152411A (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910982653.7A Pending CN112152411A (en) | 2019-10-16 | 2019-10-16 | Three-phase brushless permanent magnet direct current motor |
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| Country | Link |
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| CN (1) | CN112152411A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10314763A1 (en) * | 2003-03-31 | 2004-10-14 | Robert Bosch Gmbh | Electrical machine excited by permanent magnet |
| JP2005033941A (en) * | 2003-07-08 | 2005-02-03 | Toshiba Corp | Stator core for permanent magnet motor, and permanent magnet motor |
| CN103259351A (en) * | 2013-05-13 | 2013-08-21 | 广东威灵电机制造有限公司 | Permanent magnet motor |
| CN203574521U (en) * | 2013-11-08 | 2014-04-30 | 佛山市顺德区进乐磁材有限公司 | Three-phase brushless direct current motor |
| CN104734446A (en) * | 2015-04-09 | 2015-06-24 | 莱克电气股份有限公司 | Built-in type permanent magnet synchronous motor |
| CN204559357U (en) * | 2015-04-23 | 2015-08-12 | 杭州微光电子股份有限公司 | DC102 external rotor electric machine golden section cuts arc magnetic shoe structure |
| CN106849406A (en) * | 2017-03-15 | 2017-06-13 | 浙江永昌电气股份有限公司 | A kind of highly effective low noise stator punching |
| CN209217862U (en) * | 2019-01-14 | 2019-08-06 | 南阳微特防爆电机有限公司 | A kind of low vibration noise abatement motor |
| CN209358302U (en) * | 2018-12-27 | 2019-09-06 | 江苏雷利电机股份有限公司 | A kind of permanent-magnet brushless DC electric machine rotor lamination structure being segmented air gap |
-
2019
- 2019-10-16 CN CN201910982653.7A patent/CN112152411A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10314763A1 (en) * | 2003-03-31 | 2004-10-14 | Robert Bosch Gmbh | Electrical machine excited by permanent magnet |
| JP2005033941A (en) * | 2003-07-08 | 2005-02-03 | Toshiba Corp | Stator core for permanent magnet motor, and permanent magnet motor |
| CN103259351A (en) * | 2013-05-13 | 2013-08-21 | 广东威灵电机制造有限公司 | Permanent magnet motor |
| CN203574521U (en) * | 2013-11-08 | 2014-04-30 | 佛山市顺德区进乐磁材有限公司 | Three-phase brushless direct current motor |
| CN104734446A (en) * | 2015-04-09 | 2015-06-24 | 莱克电气股份有限公司 | Built-in type permanent magnet synchronous motor |
| CN204559357U (en) * | 2015-04-23 | 2015-08-12 | 杭州微光电子股份有限公司 | DC102 external rotor electric machine golden section cuts arc magnetic shoe structure |
| CN106849406A (en) * | 2017-03-15 | 2017-06-13 | 浙江永昌电气股份有限公司 | A kind of highly effective low noise stator punching |
| CN209358302U (en) * | 2018-12-27 | 2019-09-06 | 江苏雷利电机股份有限公司 | A kind of permanent-magnet brushless DC electric machine rotor lamination structure being segmented air gap |
| CN209217862U (en) * | 2019-01-14 | 2019-08-06 | 南阳微特防爆电机有限公司 | A kind of low vibration noise abatement motor |
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Application publication date: 20201229 |
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