考虑定子电阻的无刷电机换相转矩脉动抑制-电机与控制学报.PDF

14 10 Vol14 No10 2010 10 ELECTRIC MACH INES AND CONTROL Oct. 2010 1 1 2 高峰 , 张雪锋 , 季学武 ( 1. , 100191; 2. , 100084) : 针对汽车电动助力转向系统用无刷直流电机的换相转矩脉动问题进行了理论分 鉴于 系统供电电压低,工作电流大的特点,研究了相电阻对换相转矩脉动的影响,得到较传统方法更为 精确的判断公式,用于确定换相时的补偿相弥补了在临界点附近,传统控制策略误补偿的缺点 为提高转矩脉动抑制的精确度, 考虑相电阻的同时采用分段线性化方法来估算换相电流的斜率,得 到补偿相的占空比对其进行 P M控制,使开通和关断相电流的变化速率相等,从而抑制换相转矩 脉动,仿真和实验结果都验证了该方法的有效性 : 无刷直流电机; 换相转矩脉动; 分段线性化; 电动助力转向 : TM 921 : A : 1007- 449X(2010) 10- 0026- 06 Suppression of torque ripple due to phase commutation in brushless DCmotor drives considering the stator resistance 1 1 2 GAO Feng , ZHANG Xuefeng , JIXuewu ( 1. SchoolofTransportation Science and Engineering, BeijingUniversity ofAeronautics andAstronautics, Beijing 100191, China; 2. Department ofAutomobile Engineering, TsinghuaUniversity, Beijing 100084, China) Abstract: This paper presents a theoretical analysis on the torque ripple due to phase commutation in BLDCM (brushlessDC motor) drives forEPS (electric power steering) applications. Given the charac teristicsof the system s low supplyvoltage andhigh operating curren,t the influencesofphase resistances on commutation torque ripplewas investigated. Then amore precise rule than conventionalmethod isde rived to determinewhich commutatedphase needs the compensation indeedwithin the commutation inter vals, whichmakesup for the lakeoferror compensation of conventionalschemenear the critic