基于磁阻式步进电机的恒定制动转矩负载

A constant braking torque load based on reluctance step motors

空间齿轮传动系统寿命实验需要一种能够在不同转速下提供恒定制动转矩的负载,而传统的制动器往往不适用于真空环境,或者转矩不平稳.为此提出一种基于磁阻式步进电机的真空低速恒转矩负载,其基本原理是利用相电流细分技术,合成出一个大小恒定、而落后转子相位π/2的旋转磁场,使转子在旋转状态下保持最大静态锁定转矩.通过调节驱动电流幅值控制锁定转矩,并通过改变驱动电流的频率控制磁场转速,从而实现电机在不同转速下输出平稳、可调的制动转矩.实验表明,在转速1～160 r/min,该负载可提供0.65～8.43N.m的平稳可调制动转矩.

Life experiments on space gears need a brake which brings constant torque at any rotating speed, but the traditional brakes do not fit the vacuum condition or produce unstable torque. Therefore, a constant braking torque load based on reluctance step motors was proposed. A method of phase current subdivision was used to generate amagnetic field, This magnetic field was constant in amplitude and fell behind the rotator by π/2 in phase. It keptable braking torque at any rotating speed by adjusting the amplitude of the driving current to control the holding torque and changing the driving frequency to control the rotating speed of the magnetic field. The experimental resuits show that the developed load system can generate a braking torque which ranges from 0.65 - 8.43 N - m when the rotating speed is 1- 160 r/min.