摘要:作为航天器姿态控制的关键执行机构,控制力矩陀螺(CMG)转子的稳速精度是决定其输出力矩精度的重要因素之一,高速电机通常采用锁相环技术实现高精转速,但电机驱动电流的饱和非线性大幅度延长了锁相跟踪收敛时间和扰动恢复时间,严重影响稳速精度。本文建立了包含驱动饱和特性的高速无刷直流电机锁相控制系统模型,采用相平面法分析稳定性和跟踪时间,提出基于串联PD校正的快速锁相控制方法,针对该方法进行了仿真分析,锁相跟踪时间减少了90%,而且不会影响系统稳定性。仿真和实验结果验证了该方法的正确性和有效性。 关键词:无刷直流电机;锁相环控制;非线性
Abstract: As the key implement in spacecraft attitude control, CMGs speed stability is one of the crucial fators to its output moment precision. Phase Lock Loop(PLL) technology is usually used by the high speed BLDC motor to realize high precision rotary speed. The phase lock tracking convergence time and disturbance recovery time are largely extended by the saturated nonlinearity of motor drive current. To solve such problem, a phase lock control model which can drive the high speed BLDC motor with saturated nonlinearity was set up. There phase plane method was used to analyse the stability and tracking time. Based on cascade PD correction, put forward a fast phase lock control method. Simulation analysis shows that phase lock tracking time can be reduced by 90% while the system stability is still hold. Experimental results testify the correctness and effectiveness. Key words: brushless DC motor; PLL; nonlinear
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