一种新型无刷直流电动机调速电路设计

An Improved Speed Governing Circuit for Brushless DC Motor

为了提高电机的可靠性,基于对无刷直流电动机(BLDCM)调速原理的分析,通过对传统有刷直流电机调速系统通常采用的脉宽调制(PWM)电路的改进,设计了一种新的PWM调速电路,该电路利用单电源供电,克服了双电源不对称时对调速脉宽的影响,通过对该电路的系统试验,结果表明,所设计的电路应用器件少,可控性好,精度高,电源电压稳定性要求低且输出稳定,可广泛应用于测量、通信、功率控制与变换等多种领域。

To enhance the reliability of motor,a new pulse width modulation（PWM） circuit for speed governing is de-signed via analyzing the speed governing principle of brushless DC motor（BLDCM） and improving the PWM circuit for traditional speed governing system of brush DC motor.This new circuit makes use of single supply to overcome the influence of asymmetric dual supply on speed governing pulse width.The experimental results show that the new circuit is of less parts,better controllability,higher precision,and stable output with loose supply voltage requirement.The improved speed governing circuit can be extensively applied to measurement,communication,power control and con-version,etc.