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Sensorless control of switched reluctance motor at low and medium speeds based on PWM control
Received date: 2014-08-22
Revised date: 2015-01-12
Online published: 2015-01-30
Supported by
National Natural Science Foundation of China ( 51277094)
Sensorless control at low and medium speeds is still a challenging problem for switched reluctance motors. In order to estimate the rotor position continuously, a sensorless method based on PWM control is proposed. High-frequency triangle carrier waves intersect with low-frequency reference signals, which correspond to the rotor position. And the resultant PWM signals are used to drive the switching transistors of asymmetric half bridge converter. Spectral analysis shows that it is equivalent to inject sinusoidal signals with the same frequency as carrier waves. Then, after filtering and coordinate transformation, continuous rotor position information can be obtained. For the bad quality of sinusoidal inductance curve, phase shift and subtraction are applied to remove second harmonics, thus simplifying the process of estimation. Without injecting extra high-frequency signals, the method possesses the same accuracy and is easy for implementation. Finally, simulations and experiments are conducted on a 12/8 prototype to verify the validity of this method.
HU Rongguang , DENG Zhiquan , CAI Jun , WANG Cheng . Sensorless control of switched reluctance motor at low and medium speeds based on PWM control[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(7) : 2340 -2349 . DOI: 10.7527/S1000-6893.2015.0015
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