Abstract
Permanent-magnet synchronous motors (PMSMs) with sinusoidal back EMF are widely used in domestic appliances for the reduction of acoustic noise and energy consumption. PMSMs are generally controlled with a sinusoidal waveform current. Typically, PMSMs are controlled by vector-controlled sinusoidal drives, which require substantial computational resources. Hence, simpler sinusoidal wave drives such as V/f drives, which control the phase difference between the voltage and the current (the power factor of the PM motor), have been proposed for controlling PMSMs, This paper presents a new method that does not require current sensors but can be used to estimate the phase difference by sampling the voltage of the shunt resistor, which is used to detect the overcurrent supplied to the inverter. This method allows for detection of the current and accurate estimation and appropriate control of the phase difference. Using this method, we were able to control the phase difference and achieve high efficiency, cost reduction, and high reliability. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 180(4): 57–65, 2012; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.21201
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