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用多数函数反电动势滤波的无位置传感器BLDC电机控制
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用多数函数反电动势滤波的无位置传感器BLDC电机控制
本文讨论了用数字信号控制器（DSC）上的多数滤波器来控制无刷直流电动机的无传感器技术。该算法利用多数功能数字滤波反电动势（BEMF）。电机的各相的过滤，以确定当整流电机驱动电压。
这种控制技术不需要离散、低通滤波硬件和片外比较器。无传感器梯形控制有五个主要部分：
采用模拟数字转换器（ADC）梯形反电动势信号采集外周在DSC
电机虚拟中性点的重构
比较梯形反电动势信号重构电机虚拟中性点，以检测零交叉点
使用多数函数滤波器过滤来自比较的信号
电机驱动电压的换向
Sensored control vs. sensorless control
The BLDC motor is used for both consumer and industrial applications， owing to its compact size， controllability， and high efficiency. Increasingly， it is also used in automotive applications as part of a strategy to eliminate belts and hydraulic systems， to provide additional functionality， and to improve fuel economy. The continuing reduction in the cost of magnets and the electronics required for the control of the BLDC motor has contributed to its use in an increasing number of applications， and at higher power levels.
The BLDC motor is usually operated with one or more rotor-position sensors， since the electrical excitation must be synchronous to the rotor position. For reasons of cost， reliability， mechanical packaging and especially if the rotor runs immersed in fluid， it is desirable to run the motor without position sensors， which is known as sensorless operation.
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