CN111293799A - Permanent magnet motor with optimized back electromotive force sine waveform and stator thereof - Google Patents
Permanent magnet motor with optimized back electromotive force sine waveform and stator thereof Download PDFInfo
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- CN111293799A CN111293799A CN202010124160.2A CN202010124160A CN111293799A CN 111293799 A CN111293799 A CN 111293799A CN 202010124160 A CN202010124160 A CN 202010124160A CN 111293799 A CN111293799 A CN 111293799A
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- stator
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- arc surfaces
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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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
-
- 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
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a permanent magnet motor with optimized back electromotive force sine waveform and a stator thereof, wherein the permanent magnet motor with optimized back electromotive force sine waveform comprises a stator and a rotor, stator teeth are uniformly distributed in the stator, the inner surface of each stator tooth is provided with two symmetrically arranged concave arc surfaces, the axis of each concave arc surface deviates from the axis of the stator, the symmetrical surfaces of the two concave arc surfaces of each stator tooth are central vertical tangent surfaces in the radial direction of the stator tooth, and the intersection line of the two concave arc surfaces of each stator tooth is positioned on the symmetrical surfaces of the two concave arc surfaces. The stator is matched with the rotor to generate a non-uniform air gap, improve the sine degree of the air gap, enable the waveform of counter electromotive force to tend to be sinusoidal, simultaneously reduce the torque pulsation and the cogging torque of the motor, reasonably utilize the tooth crest height, reduce the current and the reluctance torque of the motor and improve the performance of the motor.
Description
Technical Field
The invention relates to a permanent magnet motor with optimized back electromotive force sine waveform and a stator thereof, belonging to the technical field of motors.
Background
With the development and progress of science and technology, the demand for high-speed transmission in production activities becomes increasingly urgent. The high-speed permanent magnet synchronous motor achieves the effects of energy conservation and environmental protection by utilizing the advantages of high height efficiency and high power density, and is widely applied to the fields of new energy automobiles, textiles, high-speed grinding machines, aerospace and the like.
When the new energy compressor is used for a motor, the stator winding of the permanent magnet synchronous motor is mainly distributed, the stator winding has good electrical performance, but more materials are consumed due to the fact that the end part of the distributed structure is relatively longer, copper consumption is increased, the axial length of the motor is longer, and the exposed end part has certain insulation risk under severe working conditions. However, the fractional-slot centralized winding structure with many advantages is produced, because the back electromotive force of the permanent magnet synchronous motor contains a large amount of harmonic waves, the waveform is not an ideal sine wave, the centralized winding is more obvious in performance, the control precision is reduced, the loss and the torque ripple are increased, the performance of the NVH (noise, vibration and sound vibration roughness) is far inferior to that of the distributed winding, and the performance is greatly reduced. The structure of the stator of the permanent magnet motor commonly used at present is shown in fig. 1, in the stator 1, the inner surface of the stator tooth 11 is an arc surface 12, the axis of the arc surface 12 is coincident with the axis of the stator 1, the waveform of the line back electromotive force of the motor adopting the stator is shown in fig. 4, the waveform of the back electromotive force of the stator is poor, the sine degree is poor, the harmonic wave is large, and compared with the noise and the vibration of the motor, the performance of the motor is influenced.
In the prior art, the sine degree of an air gap magnetic field is improved, and the waveform of back electromotive force is improved by a stator chute, a rotor oblique pole, a stator tooth part and an auxiliary groove, the width of a stator notch is adjusted, the magnet is unequal in thickness, and fractional grooves are adopted for the number of groove poles. The stator skewed slot or the rotor skewed pole is helpful for reducing the cogging torque and improving the sine degree of an air gap magnetic field, but the production process has difficulty. And adopt the mode of stator tooth portion with the auxiliary tank, though can improve back electromotive force wave form, can lose certain fundamental wave moment of torsion, reduce the performance of motor, because of the reason of mechanical strength, not only increase the preparation degree of difficulty of mould, influenced the life of mould moreover.
Disclosure of Invention
The invention aims to provide a permanent magnet motor with optimized back electromotive force sine waveform and a stator thereof, which improve the sine degree of an air gap magnetic field by changing the shape of the inner surface of the teeth of the stator, thereby effectively reducing the harmonic content.
The invention adopts the following technical scheme: the utility model provides a permanent-magnet machine that counter electromotive force sinusoidal waveform optimizes, its includes stator and rotor, and stator inside has evenly distributed's stator tooth, and the internal surface of every stator tooth is the indent arc surface that two symmetries set up, and the axis of indent arc surface deviates from the axis of stator, and the plane of symmetry of two indent arc surfaces of every stator tooth is the radial ascending central vertical tangent plane of stator tooth, and the boundary line of two indent arc surfaces of every stator tooth is located the plane of symmetry of two indent arc surfaces.
The circle centers of all the concave arc surfaces are on the same circle taking the circle center of the stator as the circle center.
The distance between the intersection line of the two concave arc surfaces of each stator tooth and the axis of the stator is 29mm, the circle where the centers of all the concave arc surfaces are located is defined as a base circle, the diameter of the base circle is 28.6 +/-0.05 mm, and the radius of each concave arc surface is 15.12 mm.
The stator of the permanent magnet motor with the optimized back electromotive force sinusoidal waveform is internally provided with stator teeth which are uniformly distributed, the inner surface of each stator tooth is provided with two symmetrically-arranged concave arc surfaces, the axis of each concave arc surface deviates from the axis of the stator, the symmetrical surfaces of the two concave arc surfaces of each stator tooth are radial central vertical tangent surfaces of the stator tooth, and the intersection line of the two concave arc surfaces of each stator tooth is positioned on the symmetrical surfaces of the two concave arc surfaces.
The circle centers of all the concave arc surfaces are on the same circle taking the circle center of the stator as the circle center.
The distance between the intersection line of the two concave arc surfaces of each stator tooth and the axis of the stator is 29mm, the circle where the centers of all the concave arc surfaces are located is defined as a base circle, the diameter of the base circle is 28.6 +/-0.05 mm, and the radius of each concave arc surface is 15.12 mm.
The invention has the beneficial effects that: the stator is matched with the rotor to generate an uneven air gap, so that the sine degree of the air gap can be improved, the waveform of counter electromotive force tends to be sinusoidal, the torque pulsation and the tooth socket torque of the motor are reduced, the tooth crest height is reasonably utilized, the current of the motor is reduced, the reluctance torque is reduced, and the performance of the motor is greatly improved. In addition, the inner surface of the stator tooth of the invention adopts two arc surfaces, and compared with the prior art that the stator tooth is grooved, the production process for processing the stator of the invention is simple, and the service life of the stator die is not influenced.
Drawings
FIG. 1 is a schematic view of a stator tooth of a prior art permanent magnet electric machine;
FIG. 2 is a schematic view of the stator teeth of the permanent magnet electric machine of the present invention;
FIG. 3 is an enlarged view of the stator teeth of FIG. 2;
FIG. 4 is a stator dimension chart for use with one embodiment of the present invention;
FIG. 5 is a waveform of line back EMF using the stator of FIG. 1;
fig. 6 is a waveform diagram of a line back electromotive force using the stator of fig. 2.
In the figure, 1-stator, 11-stator teeth, 12-arc surface and 13-concave arc surface.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The permanent magnet motor with the optimized back electromotive force sine waveform comprises a stator 1 and a rotor, wherein the stator 1 is structurally shown in fig. 2, stator teeth 11 are uniformly distributed in the stator 1, the inner surface of each stator tooth 11 is provided with two symmetrically-arranged concave arc surfaces 13, the axis of each concave arc surface 13 deviates from the axis of the stator, the symmetrical surfaces of the two concave arc surfaces 13 of each stator tooth 11 are central vertical tangent surfaces in the radial direction of the stator tooth, the intersection line of the two concave arc surfaces 13 of each stator tooth 11 is positioned on the symmetrical surfaces of the two concave arc surfaces, and the centers of all the concave arc surfaces are positioned on the same circle with the center of the stator as the center of the circle.
The size of the stator adopted in this embodiment is as shown in fig. 4, in this embodiment, the distance between the intersection line of the two concave arc surfaces of each stator tooth and the axis of the stator is 29mm, a circle in which the centers of all the concave arc surfaces are located is defined as a base circle, the diameter of the base circle is 28.6 ± 0.05mm, and the radius of the concave arc surface is 15.12 mm.
The experimental comparison of the parameters using the stator of fig. 1 and the stator of fig. 4 is shown in the following table:
| parameter stator | Stator in fig. 1 | Stator in fig. 2 |
| Reluctance torque | 0.44254Nm | 0.31233Nm |
| Cogging torque | 0.96679Nm | 0.23706Nm |
| Torque ripple | 12.766% | 11.242% |
| Line back emf harmonics | 15.06% | 8.92% |
Fig. 5 and 6 show graphs of Back electromotive force waveforms of lines using the stator of fig. 1 and the stator of fig. 2, respectively, in fig. 5 and 6, the ordinate represents a Back electromotive force voltage value, i.e., Back EMF (Volts), and the abscissa represents an angle, i.e., position (edeg). Through the comparison test results, the stator back electromotive force provided by the invention has the advantages that the waveform distortion rate is low, the sine degree is high, and the arc design of the tooth part can more effectively adjust the non-uniform air gap, improve the sine degree of an air gap magnetic field, reduce the harmonic content, reduce the loss, improve the NVH, reduce the influence of the tooth socket torque and improve the running performance of the motor. The permanent magnet motor in the embodiment is verified by the dynamometer that the temperature rise curve of the motor is gentle, the sine degree of the no-load counter electromotive force waveform is high, the control is facilitated, the motor efficiency is high, and the output of the motor NVH and the motor torque performance can be guaranteed. The motor has great advantages in NVH and control thereof, greatly improves the operation and use performance of the motor, and has good market prospect for meeting market demands.
The embodiment of the counter electromotive force sine waveform optimized permanent magnet motor stator of the embodiment of the invention is the same as the stator structure of the counter electromotive force sine waveform optimized permanent magnet motor embodiment, and the details are not repeated here.
Claims (6)
1. The utility model provides a permanent-magnet machine that counter electromotive force sine waveform is optimized, its includes stator and rotor, and there is evenly distributed's stator tooth stator inside the stator, its characterized in that: the inner surface of each stator tooth is provided with two symmetrically-arranged concave arc surfaces, the axis of each concave arc surface deviates from the axis of the stator, the symmetrical surfaces of the two concave arc surfaces of each stator tooth are radial central vertical tangent surfaces of the stator tooth, and the intersection line of the two concave arc surfaces of each stator tooth is positioned on the symmetrical surfaces of the two concave arc surfaces.
2. A back-emf sine waveform optimized permanent magnet machine as claimed in claim 1, wherein: the circle centers of all the concave arc surfaces are on the same circle taking the circle center of the stator as the circle center.
3. A back-emf sine waveform optimized permanent magnet machine as claimed in claim 2, wherein: the distance between the intersection line of the two concave arc surfaces of each stator tooth and the axis of the stator is 29mm, the circle where the centers of all the concave arc surfaces are located is defined as a base circle, the diameter of the base circle is 28.6 +/-0.05 mm, and the radius of each concave arc surface is 15.12 mm.
4. The utility model provides a permanent-magnet machine stator that counter electromotive force sine waveform is optimized, its inside has evenly distributed's stator tooth, its characterized in that: the inner surface of each stator tooth is provided with two symmetrically-arranged concave arc surfaces, the axis of each concave arc surface deviates from the axis of the stator, the symmetrical surfaces of the two concave arc surfaces of each stator tooth are radial central vertical tangent surfaces of the stator tooth, and the intersection line of the two concave arc surfaces of each stator tooth is positioned on the symmetrical surfaces of the two concave arc surfaces.
5. A back EMF sine waveform optimized permanent magnet motor stator as claimed in claim 4, wherein: the circle centers of all the concave arc surfaces are on the same circle taking the circle center of the stator as the circle center.
6. A back-emf sine waveform optimized permanent magnet motor stator as claimed in claim 5, wherein: the distance between the intersection line of the two concave arc surfaces of each stator tooth and the axis of the stator is 29mm, the circle where the centers of all the concave arc surfaces are located is defined as a base circle, the diameter of the base circle is 28.6 +/-0.05 mm, and the radius of each concave arc surface is 15.12 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010124160.2A CN111293799B (en) | 2020-02-27 | 2020-02-27 | Permanent magnet motor with optimized back electromotive force sine waveform and stator thereof |
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| CN202010124160.2A CN111293799B (en) | 2020-02-27 | 2020-02-27 | Permanent magnet motor with optimized back electromotive force sine waveform and stator thereof |
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| CN111293799A true CN111293799A (en) | 2020-06-16 |
| CN111293799B CN111293799B (en) | 2022-10-28 |
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| CN111293799B (en) | 2022-10-28 |
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