一种永磁同步电机I/f控制的改进方法

Improved Method Based on I/f Control Strategy of PMSM

为了提高无位置传感器永磁同步电机(PMSM)锯板电机的控制精度和动态响应灵敏度,课题组在I/f控制的基础上提出一种改进方案以提高负载冲击时的运行稳定性。该方案通过检测功率因数角感知负载的变化,补偿给定电流幅值跟随负载转矩,通过实时补偿给定参考位置解决瞬时负载冲击时转子角度变化过快的问题,持续大负载造成电流较大时通过减速释放动能来平衡负载直至堵转,解决了I/f控制方法下的失步问题。实验结果表明:电机样机能够承受瞬时转矩冲击,且在持续大负载转矩下保持电磁转矩输出;在负载降低后,系统可以自动恢复转速运行,全程无失步。

In order to improve the control accuracy and dynamic response sensitivity of sensorless permanent magnet synchronous motor( PMSM) saw motor,an improved method based on I/f control strategy was proposed to improve operation stability under impact torque. The propose method detected power factor angle to judge the variation of load.Current amplitude compensation was applied to follow load torque,the reference position compensation was applied to solve the fast variation of rotor angle under transient torque impact,and motor speed was reduced to release kinetic energy to balance the load until zero speed when large current occurs due to continuous heavy load,which solved the synchronization losing problem of I/f control strategy. Experimental results verified that the prototype motor can withstand instantaneous torque impact,and maintain electromagnetic torque output under continuous high load torque.When load torque decreased,the motor could automatically accelerated to initial speed,without synchronization losing in whole operation process.