用多數(shù)函數(shù)反電動(dòng)勢(shì)濾波的無(wú)位置傳感器BLDC電機(jī)控制

　　本文討論了用數(shù)字信號(hào)控制器（DSC）上的多數(shù)濾波器來(lái)控制無(wú)刷直流電動(dòng)機(jī)的無(wú)傳感器技術(shù)。該算法利用多數(shù)功能數(shù)字濾波反電動(dòng)勢(shì)（BEMF）。電機(jī)的各相的過(guò)濾，以確定當(dāng)整流電機(jī)驅(qū)動(dòng)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(wú)傳感器梯形控制有五個(gè)主要部分：

　　采用模擬數(shù)字轉(zhuǎn)換器（ADC）梯形反電動(dòng)勢(shì)信號(hào)采集外周在DSC

　　電機(jī)虛擬中性點(diǎn)的重構(gòu)

　　比較梯形反電動(dòng)勢(shì)信號(hào)重構(gòu)電機(jī)虛擬中性點(diǎn)，以檢測(cè)零交叉點(diǎn)

　　使用多數(shù)函數(shù)濾波器過(guò)濾來(lái)自比較的信號(hào)

　　電機(jī)驅(qū)動(dòng)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.