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This paper presents a rotor position estimated method of a five-phase IPM motor based on high-frequency sinusoidal voltage injection to improve the sensorless control system performance at low speed for electric vehicles. The high-frequency sinusoidal voltage is injected into the estimated rotor reference frame. The estimated rotor position and speed are obtained by detecting and processing high-frequency...
Several position sensorless control methods of IPMSMs(Interior Permanent Magnet Synchronous Motors) using the observers have been proposed. In case of the full-order observers, these designs are difficult, because the order of the error equations of the observers becomes four. In this paper, for the position sensorless control of IPMSMs, a design method of the full-order observer based on the extended...
To enhance the reliability, sensorless vector control strategy based on sliding mode observer was adopted in flux-switching permanent magnet machine. The rotor position and speed estimation algorithm was obtained according to the voltage equation on αβ coordinate system of flux-switching permanent magnet machine, which contains the information of rotor positron. Further, a flux-switching permanent...
Synchronous reluctance motors (SynRMs) have attracted studies, because SynRMs have no magnets in the rotors. The position sensorless control at low speeds of SynRMs is now desired, and several methods have been proposed. In this paper, by using the high-frequency current control system, a new position sensorless control method of SynRMs at low speeds by superimposing high-frequency current whose amplitude...
The conventional stand-alone brushless doubly-fed generator (BDFG) control strategies need the feedback from the rotor position or speed sensors, which can reduce system reliability and increase the cost and axial volume of the machine. In this paper, a sensorless direct voltage control (DVC) strategy is presented for the stand-alone BDFG. The satisfactory dynamic performance is verified by experimental...
This paper presents a sensorless control method for IPMSMS drives over a wide speed range operation, including zero speed. The rotor position estimation of this method is based on relating the measured current derivative response which excited from fundamental PWM sequences to the incremental inductance. Compared to other saliency tracking sensorless control schemes, this method doesn't require additional...
Sensorless control can be utilized to reduce cost, size and total complexity of a motor drive or enhance reliability of the system. This paper first presents a sensorless control algorithm for a surface permanent-magnet synchronous motor (SPMSM) based on estimated flux linkages and stator currents. Within the algorithm, rotor position error can be predicted by comparing the estimated currents with...
Aiming at the application of fan, pump and compressor load, a cost-effective sensorless drive control system of permanent magnet synchronous motor (PMSM) based on V/f control is proposed and realized in this paper. Aiming at the problem that conventional V/f control cannot maintain the stable operation in middle and high frequency domain and the load fluctuation, a method of adding the speed stabilizing...
This paper presents the design and implementation of a high speed sensorless brushless DC motor (BLDCM) drive with commutation compensation. The back electromotive force (EMF) detection using three phase terminal voltage is implemented to detect the rotor position, in order to filter the high frequency switching signals, a low pass filter is applied in the back EMF detection circuits, the cut-off...
This paper proposes a sensorless field-oriented control(FOC) strategy for Surface-mount Permanent Magnet Synchronous Motor(SPMSM). Firstly, a rotor flux estimation method with a high pass filter is introduced. Secondly, the basic principle of PLL and PI parameters tuning method derivation are demonstrated. And then, the compensation method for the phase shift caused by the high pass filter has been...
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