用多數(shù)函數(shù)反電動勢濾波的無位置傳感器BLDC電機(jī)控制

　　本文討論了用數(shù)字信號控制器（DSC）上的多數(shù)濾波器來控制無刷直流電動機(jī)的無傳感器技術(shù)。該算法利用多數(shù)功能數(shù)字濾波反電動勢（BEMF）。電機(jī)的各相的過濾，以確定當(dāng)整流電機(jī)驅(qū)動電壓。

　　這種控制技術(shù)不需要離散、低通濾波硬件和片外比較器。無傳感器梯形控制有五個主要部分：

　　采用模擬數(shù)字轉(zhuǎn)換器（ADC）梯形反電動勢信號采集外周在DSC

　　電機(jī)虛擬中性點的重構(gòu)

　　比較梯形反電動勢信號重構(gòu)電機(jī)虛擬中性點，以檢測零交叉點

　　使用多數(shù)函數(shù)濾波器過濾來自比較的信號

　　電機(jī)驅(qū)動電壓的換向

　　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.