【作者】 李江勇； 刘国海； 贾洪平；

【Author】 LI Jiang-yong,LIU Guo-hai,JIA Hong-ping (College of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212013,China)

【机构】 江苏大学电气信息工程学院；

【摘要】 针对永磁无刷直流电机(PMBLDCM)励磁不可调节给弱磁控制带来难度的问题,分析了定子绕组电枢反应对永磁体转子磁场的影响,利用电枢反应的去磁作用削弱永磁体转子磁场,从而获得等效弱磁控制。基于调节电流超前反电动势角度方法(电流超前角法)的原理,提出一种基速以上采取两管、三管混合导通的新型弱磁控制策略,并对该方法进行详细分析。以Cypress公司的CY8C24533芯片为核心设计全数字控制方案,对电动车用面贴式永磁无刷直流电机进行弱磁试验,实现了两模工作方式,即基速以下通过PWM调压调速的恒转矩运行,基速以上采用新型弱磁控制策略进行弱磁控制的恒功率运行。试验系统运行良好、性能稳定。更多还原

【Abstract】 Concerning that the flux-weakening control of permanent magnet brushless DC motor is difficult to achieve due to the difficulty of magnet adjustment,the effect caused by the armature reaction of the stator winding on the magnetic field of the permanent magnet rotor is analyzed in detail. Using the demagnetization of armature reaction,a reversed magnetic field is added to obtain a weakened field,thus an equivalent flux-weakening control can be achieved.A new flux-weakening control strategy over base-speed is presented and analyzed based on the current phase advance(CPA) adjustment theory.Using the CY8C24533 chip from Cypress company,a two-mode control system is designed,where PWM method is employed to achieve constant torque operation below the base-speed and the new flux-weakening strategy is adopted to achieve constant power operation above the base-speed.Test results show that the system runs well with stable performance.更多还原