基于三相电流连续的无刷直流电动机驱动技术  

Research on a Novel Driving Strategy of BLDCM Based on Continuous Three-Phase Current Mode

作　　者：赵君[1] 蔡晓乐 ZHAO Jun, CAI Xiao-le(AVIC Computing Technique Research Institute, Xi＇ an 710065, Chin)

机构地区：[1]中航工业西安航空计算技术研究所,西安710065

出　　处：《微特电机》2018年第3期9-13,17,共6页Small & Special Electrical Machines

基　　金：航空科学基金-青年基金项目(2014ZD31006)

摘　　要：针对无刷直流电动机在传统"两两导通"驱动方式下存在非换相电流脉动,导致转矩脉动较大和引起电枢绕组铜耗较高的问题,提出一种"三相电流连续"的驱动方法。该方法以电机转矩方程、反电势方程作为约束条件,求解使绕组铜耗最小的电流极值,并将电机转子位置划分为12个扇区,根据扇区将该极值分配到三相给定电流。依据星形绕组三相电流之和为零的原理,可以通过两相电流闭环控制,实现三相电流的连续输出。为验证该驱动方法的可行性与有效性,进行了基于Simulink的建模仿真并搭建实验平台,仿真与实验结果表明该方法可以有效地抑制转矩脉动,同时可以降低电机的绕组铜耗。Aiming at the problem of inactive phase and non-commutation current ripple of brushless DC motor （BLDCM） working with the conventional two-conduction mode, which decreased power density and increased torque ripple of BLDCM, a novel continuous three-phase current driving mode for BLDCM was proposed. The novel driving mode was con- ducted by taking the torque equation and back EMF equation as the constraints to obtain the current extremum for minimum copper loss. Then the position of rotor was divided into twelve sectors. According to sector sequence, the extremum was de- signed to be the command of three-phase current in the inner current loop. As the sum of three phase current of Y-con- nected winding BLDCM is zero, the continuous current output of three phases was implemented by the current closed-loop control of two phases. In order to verify the feasibility and effectiveness of the novel driving mode, both the Simulink simulation model and experiment condition were established. The simulation and experiment results validated that the novel driving mode could restrain the torque ripple, minimize copper loss of BLDCM.

关 键 词：无刷直流电动机 三相电流连续 电流极限解 转矩脉动抑制 

分 类 号：TM33[电气工程—电机]