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High frequency (HF) signal injection scheme is widely used to estimate the initial rotor position of Interior Permanent Magnet Synchronous Motors (IPMSM). The accuracy of the estimated rotor position, however, may be degraded by the phase delay caused by pulse width modulation (PWM), digital filters in signal demodulation process, non- ideality of inverter, and so on. To solve this problem, the main...
In this paper, the rotor speed of induction motor (IM) is estimated with a combined observation structure consisting of a sliding-mode observer (SMO) and a model reference adaptive system (MRAS) in series. In this algorithm extended magnetizing currents, referring to Γ-type representation of IM, are defined, and their actual values are feasible to be calculated from the voltage equations. Based on...
The speed sensorless control method, which is based on the extended electromotive force (EEMF) model of interior permanent magnet synchronous motor, is difficult to make into use and its parameter dependence is strong. So a method to simplify the EEMF model was proposed and a simplified full order state and sliding mode observer (FOSSMO) was designed in order to achieve sensorless control. In addition,...
Permanent magnet synchronous Generator (PMSG) based direct-drive WECS has been attracting wide attentions. For the special application, sensorless control for PMSG is desired. By widely studying the previous contributes, a novel estimator based on back-EMF is proposed. The estimator is composed of back-EMF observer and a phase-lock-loop (PLL) control to get the rotor-flux speed and position. The estimator...
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