CN109245471B - alternating pole type permanent magnet vernier motor - Google Patents
alternating pole type permanent magnet vernier motor Download PDFInfo
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- CN109245471B CN109245471B CN201811315055.6A CN201811315055A CN109245471B CN 109245471 B CN109245471 B CN 109245471B CN 201811315055 A CN201811315055 A CN 201811315055A CN 109245471 B CN109245471 B CN 109245471B
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- stator
- outer stator
- rotor
- permanent magnet
- pole
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
-
- 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
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/022—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator
- H02K21/025—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator by varying the thickness of the air gap between field and armature
Abstract
The invention discloses an alternating-pole permanent magnet vernier motor which comprises an outer stator part, a rotor part and an inner stator part, wherein the outer stator part comprises an outer stator iron core, outer stator slots and outer stator teeth are uniformly distributed in the outer stator iron core at intervals in the circumferential direction, armature windings are embedded in the outer stator slots, the outer stator teeth comprise stator teeth A and stator teeth B which are alternately arranged, the end part of each stator tooth A is modulation poles, the end part of each stator tooth B is divided into two modulation poles, and an outer stator permanent magnet array is arranged between the modulation poles.
Description
Technical Field
The invention relates to the technical field of motor equipment, in particular to an alternating-pole permanent magnet vernier motor.
Background
The permanent magnet vernier motor introduces a modulation pole structure on the stator teeth of the traditional permanent magnet motor, and modulates the stator armature winding magnetic field with low pole pair number and high rotating speed by using a special vernier effect so as to obtain a harmonic magnetic field component which can be matched and acted with the permanent magnet magnetic field with high pole pair number and low rotating speed. The mode can realize the aim of low speed and high torque without increasing the volume and the number of slots of the motor.
In recent years, researchers have proposed permanent magnet motors designed by utilizing a bidirectional field modulation effect, which is similar to the vernier effect principle, and improves the air gap airtightness of the motor by introducing a Halbach permanent magnet array on a stator so as to increase the output torque of the motor, but the problems of magnetic leakage, cogging torque and the like of the motor are still obvious, the structure of the stator is complex, and the difficulty and the cost of manufacturing and installation are increased.
In recent years, researchers use the alternating pole structure to be matched with a Halbach array to improve the air gap flux density of a radial motor and provide new ideas for the design of the radial motor, however, the Halbach array can increase the torque pulsation of the motor to a certain extent in degrees and the magnetic field of the motor is not easy to modulate.
Disclosure of Invention
The invention aims to provide alternative pole type permanent magnet vernier motors with large torque and small cogging torque at low speed aiming at the defects of the prior art.
The technical scheme includes that the alternating-pole permanent magnet vernier motor comprises an outer stator part, a rotor part and an inner stator part, wherein the outer stator part comprises an outer stator iron core, outer stator slots and outer stator teeth are uniformly distributed in the outer stator iron core at intervals in the circumferential direction, armature windings are embedded in the outer stator slots, the outer stator teeth comprise stator teeth A and stator teeth B which are alternately arranged, the end portion of each stator tooth A is modulation poles, the end portion of each stator tooth B is divided into two modulation poles, and an outer stator permanent magnet array is arranged between the modulation poles.
According to the scheme, each outer stator permanent magnet array comprises outer stator radial permanent magnets and two outer stator circumferential permanent magnets which are respectively positioned at two sides of the outer stator radial permanent magnets, wherein the outer stator radial permanent magnets are magnetized along the radial outward direction or the radial inward direction, and the two outer stator circumferential permanent magnets are magnetized along the tangential direction in the opposite direction.
According to the scheme, the rotor part comprises a rotor core, rotor slots are formed in the rotor core at intervals in the circumferential direction, rotor permanent magnets are embedded between rotor teeth formed by two adjacent rotor slots, the rotor teeth and the rotor permanent magnets form an array alternating pole structure, and the alternating pole structure can be regarded as a magnet with opposite polarities and can be magnetized into the rotor teeth by the permanent magnets in the same direction.
According to the scheme, the inner stator part comprises an inner stator iron core, the center of the inner stator iron core is perforated, inner stator slots are formed in the peripheral surface of the inner stator iron core at intervals along the circumferential direction, and armature windings are embedded in the inner stator slots.
According to the scheme, the outer wall of the inner stator iron core is fixed with the magnetic conduction ring, and the outer peripheral surface of the magnetic conduction ring is provided with the salient pole structure.
According to the scheme, the rotor permanent magnets are homopolar.
According to the scheme, the number of pole pairs of the outer stator permanent magnet array and the number P of the pole structures on the magnetic conduction ringssEqual number P of pole structures on the magnetic conductive ringsNumber of pole pairs P of armature windingwNumber of pole pairs P of rotor permanent magnetsrSatisfies the relationship: ps－Pw＝Pr。
According to the scheme, the outer stator iron core, the inner stator iron core, the magnetic conduction ring and the rotor iron core are all made of silicon steel materials with high magnetic conductivity.
According to the scheme, the outer stator radial permanent magnet, the outer stator circumferential permanent magnet and the rotor permanent magnet are all made of neodymium iron boron materials.
The invention has the beneficial effects that:
1. the double-stator structure is provided with the inner stator and the outer stator, and can effectively utilize the alternating pole permanent magnet magnetic field, reduce magnetic leakage and improve torque;
2. the Halbach permanent magnet array arranged between the modulation poles is beneficial to increasing the air gap flux density at the outer side and improving the output torque;
3. the outer stator permanent magnets are arranged according to a Halbach array, the radial permanent magnets of the outer stator are magnetized along the radial direction outwards or inwards, and the other two circumferential permanent magnets of the outer stator are magnetized along the tangential direction in the opposite direction, so that the magnetic field intensity of the single side of an outer air gap is enhanced, the torque density of the motor is improved, and larger output torque can be obtained;
4. the rotor adopts an alternating pole structure, so that the using amount of permanent magnets is reduced;
5. the number of pole pairs of the permanent magnet of the stator/rotor and the number of pole pairs of the armature winding meet the relationship of a bidirectional field modulation effect, and the capacity of low speed and large torque can be obtained; the method of bidirectional field modulation effect is used for modulating higher harmonics contained in the motor, and torque pulsation is reduced;
6. the invention designs a magnetic conduction ring structure with fixed number salient poles, modulates the magnetic field of the armature winding of the inner stator, and enables the high-low speed rotating magnetic field of the inner stator and the rotor to interact;
7. the invention has reasonable design, good feasibility and high reliability.
Drawings
FIG. 1 is a schematic diagram of a two-dimensional structure of embodiments of the present invention.
Fig. 2 is a schematic perspective view of the present embodiment.
Fig. 3 is a diagram of the single-phase back-emf of the present embodiment.
Fig. 4 shows a cogging torque chart of the present embodiment.
Fig. 5 is a graph of output torque when the present embodiment is operated with a current of 15A.
Fig. 6 is a magnetic force diagram in the present example under load.
Wherein: 1. a winding; 2. an outer stator core; 3. an outer stator radial permanent magnet; 4. outer stator circumferential permanent magnets; 5. a rotor core; 6. a rotor permanent magnet; 7. a magnetic conductive ring; 8. an inner stator core; 9. outer stator teeth A; 10. outer stator teeth B; 11. and a salient pole structure.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and the specific embodiments.
The alternating pole permanent magnet vernier motor shown in fig. 1 and 2 comprises an outer stator part, a rotor part and an inner stator part, wherein,
the outer stator part comprises an outer stator iron core 2, outer stator slots and outer stator teeth are uniformly distributed in the outer stator iron core 2 at intervals in the circumferential direction, armature windings 1 are embedded in the outer stator slots, the outer stator teeth comprise stator teeth A9 and stator teeth B10 which are alternately arranged, the stator teeth A9 are of a conventional structure, the end parts of the stator teeth B10 are provided with modulation poles, the end parts of the stator teeth B10 are divided into two modulation poles, outer stator permanent magnet arrays, namely Halbach permanent magnet arrays, are arranged between the modulation poles, each outer stator permanent magnet array comprises outer stator radial permanent magnets 3 and two outer stator circumferential permanent magnets 4 which are respectively positioned on two sides of the outer stator radial permanent magnets 3, the outer stator radial permanent magnets 3 are magnetized in the radial outward direction or the radial inward direction, and the two outer stator circumferential permanent magnets 4 are tangentially magnetized in the opposite directions based on the Halbach principle;
the rotor part comprises a rotor core 5, rotor slots are formed in the rotor core 5 at intervals in the circumferential direction, rotor permanent magnets 6 are embedded between rotor teeth formed by two adjacent rotor slots, the rotor teeth and the rotor permanent magnets 6 form an array alternating pole structure, and the alternating pole structure can be regarded as that the permanent magnets 6 in the same direction magnetize the rotor teeth into magnets with opposite polarities;
the inner stator part comprises an inner stator iron core 8, the inner stator iron core 8 is of a common straight tooth structure, the center of the inner stator iron core is provided with a through hole, inner stator slots are formed in the peripheral surface of the inner stator iron core 8 at intervals along the circumferential direction, and 4-pole single-layer chain type armature windings 1 are embedded in the inner stator slots; the inner stator iron core 8 is fixed with a magnetic conductive ring 7 through a bolt, and the outer peripheral surface of the magnetic conductive ring 7 is provided with a salient pole structure 11; the salient pole structures 11 also function as modulation poles to modulate the high-speed magnetic field on the three-phase winding 1 of the inner stator core.
In the invention, the rotor permanent magnets 6 are homopolar, and the pole arc coefficient is 1; the number of pole pairs of the outer stator permanent magnet array, the number of pole pairs of the rotor permanent magnet 6 and the number of pole pairs of the armature winding 1 meet the requirement of a bidirectional field modulation effect, and the number of pole pairs of the outer stator permanent magnet array and the number P of the pole structures 11 on the magnetic conductive ring 7sEqual, the number P of the pole structures 11 on the magnetic conductive ring 7sNumber of pole pairs P of armature winding 1wNumber of pole pairs P of rotor permanent magnets 6rSatisfies the relationship: ps－Pw＝Pr. In this example, PsIs 18, PwIs 2, PrIs 16.
In the invention, the outer stator core 2, the inner stator core 8, the magnetic conduction ring 7 and the rotor core 5 are all made of silicon steel materials with high magnetic conductivity; the outer stator radial permanent magnet 3, the outer stator circumferential permanent magnet 4 and the rotor permanent magnet 6 are all made of neodymium iron boron materials; the armature winding 1 is a three-phase winding of a 4-pole single-layer chain type.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (8)
- The alternating-pole permanent magnet vernier motor is characterized by comprising an outer stator part, a rotor part and an inner stator part, wherein the outer stator part comprises an outer stator iron core, outer stator slots and outer stator teeth are uniformly distributed in the outer stator iron core at intervals in the circumferential direction, armature windings are embedded in the outer stator slots, the outer stator teeth comprise stator teeth A and stator teeth B which are alternately arranged, the end part of each stator tooth A is modulation poles, the end part of each stator tooth B is divided into two modulation poles, an outer stator permanent magnet array is arranged between the modulation poles, each outer stator permanent magnet array comprises outer stator radial permanent magnets and two outer stator circumferential permanent magnets which are respectively positioned on two sides of the outer stator radial permanent magnets, the outer stator radial permanent magnets are magnetized in the radial outward direction or the radial inward direction, and the two outer stator circumferential permanent magnets are magnetized in the tangential direction in the opposite direction.
- 2. The alternating pole permanent magnet vernier motor as claimed in claim 1, wherein the rotor portion includes a rotor core having rotor slots spaced circumferentially, and rotor permanent magnets embedded between rotor teeth formed by two adjacent rotor slots, the rotor teeth and the rotor permanent magnets forming an array of alternating pole structures, the alternating pole structures being viewed as magnets with opposite polarities magnetized by the same direction of permanent magnets.
- 3. The alternating pole permanent magnet vernier motor as claimed in claim 2, wherein the inner stator part comprises an inner stator core having a central through hole, inner stator slots having circumferentially spaced inner stator slots in an outer circumferential surface thereof, and armature windings embedded in the inner stator slots.
- 4. The alternating-pole permanent-magnet vernier motor as claimed in claim 3, wherein a magnetic conductive ring is fixed to an outer wall of the inner stator core, and a salient pole structure is provided on an outer circumferential surface of the magnetic conductive ring.
- 5. The alternating pole permanent magnet vernier motor of claim 2 wherein said rotor permanent magnets are all homopolar.
- 6. The alternating pole permanent magnet vernier motor of claim 4 wherein the number of pole pairs of the outer stator permanent magnet array and the number of pole structures P on the flux ringsEqual number P of pole structures on the magnetic conductive ringsNumber of pole pairs P of armature windingwNumber of pole pairs P of rotor permanent magnetsrSatisfies the relationship: ps-Pw＝Pr。
- 7. The alternating pole permanent magnet vernier motor as claimed in claim 4, wherein the outer stator core, the inner stator core, the flux ring and the rotor core are made of silicon steel material having high permeability.
- 8. The alternating pole permanent magnet vernier motor of claim 4 wherein said outer stator radial permanent magnets, outer stator circumferential permanent magnets and rotor permanent magnets are made of neodymium iron boron material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811315055.6A CN109245471B (en) | 2018-11-06 | 2018-11-06 | alternating pole type permanent magnet vernier motor |
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| CN201811315055.6A CN109245471B (en) | 2018-11-06 | 2018-11-06 | alternating pole type permanent magnet vernier motor |
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| CN109245471A CN109245471A (en) | 2019-01-18 |
| CN109245471B true CN109245471B (en) | 2020-01-31 |
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| CN110112878A (en) * | 2019-04-24 | 2019-08-09 | 华中科技大学 | A kind of extremely tangential excitation vernier magneto of alternating |
| CN110460182B (en) * | 2019-05-28 | 2021-07-09 | 东南大学 | Modularized permanent magnet composite self-deceleration servo motor based on alternating poles |
| EP3754823A1 (en) * | 2019-06-19 | 2020-12-23 | BioCoRe S. Coop. | High-efficiency compact electric generator for wind turbine farms |
| CN110808673B (en) * | 2019-12-09 | 2021-11-23 | 武汉理工大学 | Novel double-stator Halbach alternating pole permanent magnet vernier motor |
| CN112467901B (en) * | 2020-11-12 | 2022-02-18 | 华中科技大学 | Magnetic gear composite direct drive motor and application thereof |
| CN112688454B (en) * | 2020-12-15 | 2023-01-31 | 大连海事大学 | Permanent magnet fault-tolerant vernier rim propulsion motor with optimized surface shape of alternating-pole rotor |
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| CN103178668B (en) * | 2013-03-06 | 2015-12-09 | 华中科技大学 | Radial magnetic field double-stator vernier motor |
| CN104201848B (en) * | 2014-07-04 | 2017-06-06 | 东南大学 | A kind of double-stator permanent magnet vernier wind-driven generator |
| CN104883016B (en) * | 2015-05-08 | 2018-02-27 | 江苏大学 | A kind of bimorph transducer magnetic field modulation type magneto |
| CN105743235B (en) * | 2016-04-08 | 2018-04-24 | 江苏大学 | High torque (HT) low consumption permanent magnetism fault-tolerant motor |
| CN106602823A (en) * | 2017-02-23 | 2017-04-26 | 武汉理工大学 | Double-claw-pole-stator magnetic gathering type vernier motor |
| CN106877607A (en) * | 2017-04-11 | 2017-06-20 | 东南大学 | Using the winding divergence type bearingless synchronous reluctance motor of Halbach permanent magnet arrays |
| CN207082991U (en) * | 2017-06-20 | 2018-03-09 | 哈尔滨理工大学 | Direct-drive type magnetic coupled type harmonic motor |
| CN108092480B (en) * | 2018-01-11 | 2024-04-23 | 南方科技大学 | Permanent magnet motor |
| CN108880164B (en) * | 2018-07-09 | 2020-06-19 | 武汉理工大学 | Bidirectional modulation hybrid excitation alternating-pole motor |
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| Title |
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| 双定子游标磁阻电机的转矩研究;罗丹，刘福贵，杨乾坤，李宁宁;《电工电气》;20180228(第2期);第6-10页 * |
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