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1、H M h l z H ? E null null , H M h l z H ? E 刘null 婷, 罗德荣, 黄守道( 2 v , null 410082)K null 1 : 起动阻力矩是永磁风力发电机的一个重要指标, 它直接影响发电机的起动和低速运行性能b本文提出了一种永磁电机磁极偏移从而减小齿槽转矩的方法, 基于能量法和傅里叶分解对齿槽转矩解析分析方法, 推导了在磁极偏移时的齿槽转矩的表达式b最后给出了在均匀磁极与磁极偏移情况下齿槽转矩的对比, 验证了这种磁极偏移方法的可行性b实现减小直驱永磁风力发电机起动阻力矩的目的b1 o M : 永磁电机; 齿槽转矩; 磁极偏移; 直驱 m
2、s | : TM 315; T351null null null null null null D S : Anull null null null null null c I | : 1001null6848( 2010) 05null0041null04M ethod ofReducing StartingResistantMomentbyMagnetShifting inDirectnulldriven PermanentMagnetW ind PowerGeneratorsLIU Ting, LUO Denullrong, HUANG Shounulldao(HunanUniversi
3、ty, Changsha 410082, China)Abstract: Starting resistantmoment (SRM ) is an important index fordesigning of the permanentmagnullnetwind powergenerator. Iteffects the starting and lownullspeed performances of thegeneratordirectly. Inthis paper, the analyticalmethod for the cogging torque based on the
4、energymethod and Fourier transnullform wasused to give the expression of the cogging torque and themethod tominimize the cogging torquew ith thisM ethod. At las,t Itwas shown that the contrast of the cogging torquewhenmagnet equality andmagnet shifting. The new method to obtain thePM shifting angles
5、was achieved. Realized the aim to renullduce the starting resistantmoment of thedirectnulldriven permanentmagnetw ind powergenerator.KeyWords: Permanentmagnetmachine; Cogging torque; PM shifting; Directnulldrivennull null l : 2009null02null200null null E H ? B 1 S b E l H , ? H L ? ? , 4 ? b , A r h
6、 F E b? E 1 s : B 7 E , V ? z h E ; = ? b H ? # H 9 i , ? 0 7 , B M v H E , 4 d , v v Y ? , H ? ! 9 H hl B E E s A 1 b 1 I n ? Y , Y V H M Z E d H ? , K r h l E r T b D 1- 7 9 Z E h l n b D 2Y V | B 4 B 1/4 h l , Y 9 Z E b D 3| 4 B M 1/2 h l os b D 4- 75 4 | H M , i E H 8 M b D 4- 6 I n H M 7 o , 7
7、D 75 B I n o b D 1- 7 s b D 7 Z E H M ,d r T z , z ? H , z ? a + , 9 N a4 v b 4 B W B H M M Z E , ? E = s s Z E w H M Z T / V r T bK ( H H M f null41null2010M 43 5/ 1 , H M Z E V b1null ? 9 E? Z E 9 K ZE b Y H H ? W 0 null , T cog = nullWnullnull (1)T , null B L B H 8 L W C b Z L s , L ! w M H q k v
8、 , I n H , b H ? M M 1 , M H ? M V 9 ,y N = % i H ? V V U W W airgap+ PM = 12 0 !VB2dV (2) i M null, # H w V s VV U B (!, null) =Br(!) hmhm + ( !, null)(3)T , Br( !) (!, null)s Y H 8 : H r # Z _ s , hm ( !) H 8 HZ _ Z _ bT ( 2)V V U W = 12 0 !VB2r (!) hmhm + ( !, null)2dV (4)s Y B2r ( !) hm /( hm + ( !, null) ) 2 = Z 7 , V = H ? V r T , 7 V r T bY f / , H H M O ( s , m 1( a) U , H M ZE i d H H M , 7 B H M B M , m 1( b) U b( a)H ( s null null null null null null null ( b)H M null nullm 1null H
