This paper proposes a compensation algorithm to reduce position errors due to nonideal resolver signals in vector control drive system of permanent magnet synchronous motor (PMSM). Resolvers are commonly used to obtain an absolute rotor position information in severe environments. However, resolver generates periodic position errors because of amplitude imbalance and imperfect quadrature between resolver output signals. As a result, the d-and q-axis currents of the synchronous reference frame have ripples of twice the stator fundamental frequency in PMSM drives. In this paper, the compensation algorithm is proposed to reduce the position errors caused by the amplitude imbalance and imperfect quadrature, respectively. Moreover, this is implemented in the vector control drive system of PMSM. The proposed algorithm does not require any additional hardware and needs a few computation times to implement it. Experimental results verify the effectiveness of the proposed algorithm.Index Terms-Resolver, amplitude imbalance, imperfect quadrature, position errors, ripple of twice the stator fundamental frequency, integral operation
This paper proposes a compensation algorithm of analog rotor position errors due to nonideal sinusoidal encoder signals. The position sensors such as resolvers or incremental encoders are being replaced by sinusoidal encoders that offer much higher resolution. However, the periodic position errors are generated by the gain and offset errors between sine and cosine signals. In this paper, the effects of the gain and offset errors are analyzed by using dq-axis component. The analog position errors can be easily corrected by integral operation of the d-axis component. Therefore, the proposed algorithm does not need additional hardware and much computation time. The validity of the proposed algorithm is verified through experimental results. Index Terms-Sinusoidal encoder, analog rotor position errors, gain error, offset error, dq-axis component, integral operation
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