无刷直流电机的新型转子位置检测方法

A new method of detecting for rotor flux position of a sensorless DC motor

介绍了无刷直流电机无位置传感器转子位置检测的一种新方法.该方法利用非导通相反电势逻辑电平经逻辑处理后得到一脉冲列,采用PLL锁相技术将脉冲列倍频,通过倍频电路计数器的计数值可以精确检测转子位置.利用数字比较技术将计数值与锁存器中的预置数值比较,可以精确控制绕组电流的最佳换向时刻.通过调节锁存器中的预置值可以方便地调节换向角,非常适用于无刷直流电机的各种控制算法.同时该方法克服了外同步起动过程中易产生的振荡和失步现象.通过实验证明该方法是正确的、有效的.

Describes a novel method of detecting for rotor flux position of the brushless DC motor (BLDCM). A pulse line is acquired from electromagnetic force signals in the motor windings that carry no current. Using PLL technology multiples the pulse. The numerical value of counter in multiplefrequency circuit correlates to the position of rotor flux. Comparing the figure of counter with that which is prestored in fliplatch, the best commutation time can be accurately determined. The commutation angle can be flexibly adjusted by varying the prestored figure in fliplatch. This is very fit for multifarious arithmetic of BLDCM. The hunting and outofstep are conquered in the process of start. Experimental results confirm the correctness and effectiveness of this method.