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ACCURATE ROTOR POSITION SENSOR, METHOD USING MAGNET RING AND LINEAR OUTPUT HALL EFFECT SENSORS
ACCURATE ROTOR POSITION SENSOR, METHOD USING MAGNET RING AND LINEAR OUTPUT HALL EFFECT SENSORS
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机译:精确的转子位置传感器,使用磁环和线性输出霍尔效应传感器的方法
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摘要
An inexpensive and accurate device for sensing rotor position and detecting rotational speed over a broad range of speeds in an electric motor includes a sense ring magnet and two analog Hall effect sensors. The sense ring is magnetized in an alternating north-south fashion with a number of poles that correspond to a number of motor field poles. The Hall effect sensors are placed so that they measure magnetic flux tangential to the sense ring. The Hall effect sensors are preferably located at a distance from the sense ring where the Hall effect sensor output waveforms are substantially triangular, with a highly linear portion centered at zero flux between the minimum and maximum waveform peaks. The linear portions of the waveforms are decoded using an A/D converter and control software to provide an accurate measure of the rotor position.
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