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A novel sensorless rotor position detection method based on field current pulsation for high power synchronous motors is proposed in this paper. Because of the reduced component count, this method can reduce hardware cost and improve system reliability. Position information is extracted from three-phase back electromotive force. An appropriate pulsation frequency is selected and a suitable control...
A new method about sensorless real-time rotor position detecting based on electrically excited synchronous motors is proposed. The key idea is when high frequency signal is injected in the motor, the information about real-time rotor position can be detected in back electromotive forces. The theoretical derivation about how to detect the rotor position information and a key problem of signal processing...
This paper describes a soft starting control strategy for synchronous motors fed by load-commutated inverters (LCI). At low speed, high frequency (HF) current injection method is employed to obtain rotor position. When the motor speed reaches 5% of the rated motor speed, zero-crossing detection of back electromotive force (EMF) is adopted to monitor rotor position. According to the rotor position,...
Simulation is always the first step in the design of power converters. To maximally make the simulation results close to the experimental results, accurate models of all passive and active elements are necessary, which are the precondition for validating the expected behavior of the complete system including its converter topology and control algorithm without any prototype. For this reason, due to...
A new rotor position sensor less detecting method based on high power electrically excited synchronous motors is proposed. The central idea is the back electromotive forces contain the information of rotor position, when a high frequency signal is injected in the rotor by excitation part. So the rotor position can be obtained by detection and calculation of motor back electromotive forces. By experimental...
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