CN101488678A - Method for reducing positioning torque of stator permanent magnetic type electric machine based on rotor auxiliary slot - Google Patents
Method for reducing positioning torque of stator permanent magnetic type electric machine based on rotor auxiliary slot Download PDFInfo
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- CN101488678A CN101488678A CNA2009101199399A CN200910119939A CN101488678A CN 101488678 A CN101488678 A CN 101488678A CN A2009101199399 A CNA2009101199399 A CN A2009101199399A CN 200910119939 A CN200910119939 A CN 200910119939A CN 101488678 A CN101488678 A CN 101488678A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a method for reducing the locating moment of a permanent-magnet type motor of a stator based on an auxiliary groove of a rotor. The auxiliary groove is arranged on the rotor to increase upper harmonic component generated by magnetic conductance of an air gap tooth space, so that the fundamental frequency of the generated locating moment is increased, while the amplitude is correspondingly reduced. As the dimension of the auxiliary groove of the rotor is optimally designed, the idle load electric potential of the motor can be guaranteed when the locating moment is reduced, and the performance index such as torque output capability and the like can not be influenced. In the structure, the invention maintains the advantages of being compact and simple, good in robustness and suitable for high speed running of the permanent-magnet type motor of the stator; the volume of the motor is not needed to be additionally increased, and on the contrary, the magnet core quantity of the rotor can be reduced. Compared with other ways used for reducing the locating moment, the technical method is simple, convenient and effective, has low cost and is especially suitable for the permanent-magnet type motor of the stator, thus the type of motor has better application prospect in the fields such as a direct drive type aerogenerator, hybrid vehicle, etc.
Description
Technical field:
The present invention relates to a kind of mechanism of power generation technology for making, particularly relate to a kind of technology that reduces torque of stator permanent magnetic type electric machine.
Background technology:
China's conduct is the country of rare earth material reserves maximum in the world, and the research and extension application is the various novel permanent magnetic motors of representative with the rare-earth permanent-magnet electric machine energetically, has important significance for theories and using value.No matter work generates electricity or electric operation, and the novel permanent magnetic motor with characteristics such as high efficiency, big torque (power) density and low-losses is just presenting the trend of accelerated development.For a long time the domestic and international research focus concentrate on always with surface-adhered type, plug-in type and embedded be the rotor permanent magnet-type motor of representative.Yet, the type motor the design with actual moving process in all can produce into a series of problems, concentrated reflection is following 3 points: 1. pair permanent magnet sticks on the structure between rotor surface or the insertion rotor with salient pole, in order to overcome the centrifugal forces affect that high-speed cruising produces, need usually to make auxiliary permanent magnet fixture, and permanent magnet is between stator and the rotor, strengthened gas length, both increased motor volume, and can cause air gap flux density to weaken again, influence is exerted oneself; 2. to the embedded structure of permanent magnet submerged rotor core inside, can influence the mechanical strength of rotor, and need auxiliary magnetic bridge, can increase manufacture craft equally; 3. permanent magnet places rotor to be unfavorable for the cooling of the type motor.In addition,,, intercouple, have degaussing danger to a certain extent with permanent magnet because the armature reaction magnetic flux that stator winding produces all can enter rotor for the rotor permanent magnet-type motor; On the other hand, no matter be as generator or motor, in order to obtain the higher unloaded back electromotive force of sinusoidal degree, distributed winding is installed on stator usually, can directly causes winding overhang longer, increased conductor length and resistance, copper loss is bigger, reduce electric efficiency, more can make motor volume increase, limited rotor permanent-magnet type structure has the strict demand field to motor volume at space flight, aviation, navigation, electric automobile etc. application.Therefore, nearly ten or twenty is over year, research to novel stator permanent-magnet motor has both at home and abroad become a focus, the stator permanent magnetic type electric that has occurred at present three kinds of structures altogether, be respectively that the permanent magnetism magnetic linkage is that unipolar doubly salient permanent magnet motor and permanent magnetism magnetic linkage are ambipolar flux switch permanent magnet motor and flux-reversal magneto.
Yet,, and have poly-magnetic function because stator permanent magnetic type electric adopts the biconvex electrode structure, make its air gap flux density relatively large, cause location torque comparatively outstanding, cause that thus the torque pulsation in the motor operation course is bigger, limited its application in wind power generation and servo-drive field.On the other hand, the method that reduces location torque at the conventional rotors permanent magnet-type motor is all relatively complicated, implements the comparison difficulty, has improved the manufacturing cost and the processing technology difficulty of motor, simultaneously motor performance is had in various degree influence.
Summary of the invention:
Purpose of the present invention is exactly to propose the location torque that a kind of simple effective method can reduce magneto, and is especially easy to implement at the design feature of stator permanent magnetic type electric.This method is applicable to that permanent magnet places stator, the electric machine structure that rotor only is made up of conducting magnet core, promptly all feasible to three kinds of stator permanent magnetic type electrics that occurred at present, and also effectively simple, need not to increase design of electrical motor and manufacturing cost, can reduce core material on the contrary.
The present invention is achieved in that the torque of stator permanent magnetic type electric machine based on the rotor auxiliary tank of the present invention reduces method, comprise two parts of stator and rotor, described stator and rotor all are the biconvex electrode structure, described stator is provided with winding and permanent magnet in the three-phase set, it is characterized in that: on described rotor, open auxiliary tank to increase the higher harmonic components of air gap teeth groove magnetic conductance, make the location torque fundamental frequency that produces increase, reduce and amplitude is corresponding.
The present invention compared with prior art has following advantage:
Because technology implementation object of the present invention is a stator permanent magnetic type electric, and the concentrated armature winding of the type motor and permanent magnet all are arranged on the stator, rotor only is a conducting magnet core, so electric machine structure of the present invention is very simple and firm, and helps improving the cooling condition of this motor; In addition, owing to adopted concentrated winding mode, can reduce tip lengths, reduce resistance and copper loss as much as possible, also guarantee the compact conformation of motor, power density is bigger, and efficient is higher.Specific to technical scheme of the present invention, have following advantage:
1. adopt novel stator permanent magnetic type structure, being about to permanent magnet places stator and replaces traditional rotor permanent-magnet type, rotor portion is that silicon steel sheet is pressed the folded solid core that forms, and makes motor rotor construction very firm, and is no longer necessary for the fixed rotor magnet steel and adds complicated processing technology;
2. traditional location torque at the rotor permanent magnet-type motor reduces method, comprise that skewed stator slot, skewed-rotor, stator rabbet width inequality, permanent magnet surfaces optimization etc. all can produce to a certain degree influence to motor performance, and can increase the manufacturing cost of motor.Auxiliary tank is very easy to be implemented and the rotor that the present invention proposes is opened, on using, engineering is convenient to realize, and be optimized by size, can guarantee when reducing location torque not and can exert an influence performances such as the no-load emf of motor, torque (power) fan-out capabilities to opening auxiliary tank;
3. both reduce location torque by implementing the improved stator permanent magnetic type electric of the technology of the present invention, kept the characteristics that power density is big, cool off, be fit to high-speed cruising easily again.With the wind generator system of its composition, can reduce starting wind velocity, widen the wind speed range of power output; And also can be effectively controlled with the servo drive system of its composition torque pulsation problem when the low cruise.
Description of drawings:
Fig. 1 is the structural representation of flux switch permanent magnet motor of the present invention
Fig. 2 is a doubly salient permanent magnet motor structural representation of the present invention
Fig. 3 is a flux-reversal permanent magnet motor structure schematic diagram of the present invention
1. stator 2. rotors 3. are concentrated armature winding 4. permanent magnets 5. auxiliary tanks
Embodiment:
With Fig. 1 example, magnetic flux of the present invention switches doubly salient permanent magnet motor and comprises stator 1 and rotor 2, rotor 2 is positioned at the inside or the outside of stator 1, stator 1 and rotor 2 all are the biconvex electrode structure, wherein stator 1 is made up of 12 U-shaped magnetic conductive iron, stator 1 is provided with winding 3 and 12 permanent magnets 4 in the three-phase set, and rotor 2 has 10 rotor tooths, has 2 auxiliary tanks 5 on each rotor tooth.
Because stator slot is 12, rotor tooth is 10, and therefore the location torque fundametal compoment frequency that is produced is 60, and corresponding Machine cycle is 6 degree.And after this motor location torque carried out harmonic analysis, find in each higher harmonic components of its location torque that second harmonic is bigger.Therefore, be chosen at and open 2 auxiliary tanks on its rotor tooth to weaken the second harmonic component of location torque.In addition, the groove depth and the width of rebate of opening auxiliary tank all carried out optimal design, optimization aim guarantees as far as possible that for when reducing location torque as far as possible the amplitude of empty load of motor electromotive force and sinusoidal degree remain unchanged.
In specific implementation process, for simplicity, keep the groove depth of auxiliary tank consistent, and be allowed to condition at variation in the certain limit with width of rebate, calculate optimum dimensional parameters by analytic method and Finite Element Method.
The method that location torque reduces in Fig. 2 doubly salient permanent magnet motor and Fig. 3 flux-reversal magneto and the principle of Fig. 1 flux switch permanent magnet motor are the same.
Claims (3)
1. the torque of stator permanent magnetic type electric machine based on the rotor auxiliary tank reduces method, comprise (2) two parts of stator (1) and rotor, described stator (1) and rotor (2) all are the biconvex electrode structure, described stator (1) is provided with winding in the three-phase set (3) and permanent magnet (4), it is characterized in that: on described rotor (2), have auxiliary tank (5) to increase the higher harmonic components of air gap teeth groove magnetic conductance, make the location torque fundamental frequency that produces increase, reduce and amplitude is corresponding.
2. the torque of stator permanent magnetic type electric machine based on the rotor auxiliary tank according to claim 1 reduces method, it is characterized in that: described auxiliary tank (5) is two.
3. the torque of stator permanent magnetic type electric machine based on the rotor auxiliary tank according to claim 1 and 2 reduces method, it is characterized in that: the groove depth of described auxiliary tank (5) is consistent with width of rebate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101199399A CN101488678A (en) | 2009-02-27 | 2009-02-27 | Method for reducing positioning torque of stator permanent magnetic type electric machine based on rotor auxiliary slot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101199399A CN101488678A (en) | 2009-02-27 | 2009-02-27 | Method for reducing positioning torque of stator permanent magnetic type electric machine based on rotor auxiliary slot |
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| CN101488678A true CN101488678A (en) | 2009-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2009101199399A Pending CN101488678A (en) | 2009-02-27 | 2009-02-27 | Method for reducing positioning torque of stator permanent magnetic type electric machine based on rotor auxiliary slot |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158458B (en) * | 2014-07-24 | 2017-01-18 | 天津大学 | Magnetic field analytic calculating method for surface-mounted permanent magnet motor with tilted trough structure |
| WO2018105754A3 (en) * | 2016-10-18 | 2018-08-23 | RI, Yongjin | Method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator |
-
2009
- 2009-02-27 CN CNA2009101199399A patent/CN101488678A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158458B (en) * | 2014-07-24 | 2017-01-18 | 天津大学 | Magnetic field analytic calculating method for surface-mounted permanent magnet motor with tilted trough structure |
| WO2018105754A3 (en) * | 2016-10-18 | 2018-08-23 | RI, Yongjin | Method for increasing the electric power output by weakening the electromagnetic braking force to be exerted on the rotor of electric generator |
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Open date: 20090722 |