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The PWM converter includes a low-pass filter in order to remove the high-frequency current that flows to the power grid. The low-pass filter is composed of two reactors and a capacitor (LCL-filter). The LCL-filter is the gain characteristic that attenuates by the high frequency band, and can eliminate the career ripple of the current. However, LCL-filter has a strong resonance characteristic. When...
This paper proposes a new method of position sensorless control for synchronous reluctance machine (SynRM). The position sensorless scheme is based on the instantaneous power optimization the feature of which takes a specific control axes on reactive and real power and realizes both rotor speed estimation and tracking to the point of the maximum torque per current. Adopting the signal injection onto...
This paper introduces three years of industrial experience with sensorless interior permanent magnet synchronous motor (IPMSM) drive based on high frequency injection method (HFIM). In 2008 the first commercial general purpose inverter with sensorless control based on HFIM was launched. The HFIM enabled the sensorless IPMSM drive to control torque and speed under ultra-low speed region including zero...
This paper presents a new hybrid sensorless control of interior permanent magnet synchronous machines (IPMSM) for direct drive applications. The control combines both high frequency injection and back EMF based method, and realizes position, speed, and torque control in the entire speed range. Owing to the reliability and the space-saving feature, the sensorless control is applied to direct drive...
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