As one of the most important methods of motor speed estimation, the method using rotor slot harmonics (RSH) has good application prospect on sensorless induction motor system, since it is hardly affected by motor parameter variation and has strong robustness to parameter variation. However, most of the traditional methods are based on RSH analysis in line current, where the rotor slot harmonics are limited by the motor structure and have small amplitude and poor signal to noise ratio (SNR), resulting in poor generality and accuracy. Aiming at the above problems, a method for inducing RSH with internal search coils is presented in this paper. By studying the contributory factor of SNR of RSH, the approaches of optimal design of search coils are proposed. Simulation and experiments were carried out on a 15-phase motor, and the results show that the SNR of RSH can be improved significantly and the proposed method has good precision.
张逸超, 王东, 易新强, 胡靖华, 孟繁庆. 用于感应电机转速估计的感应线圈设计方法[J]. 电工技术学报, 2018, 33(24): 5760-5767.
Zhang Yichao, Wang Dong, Yi Xinqiang, Hu Jinghua, Meng Fanqing. Design Method of Search Coils for Induction Motor Speed Estimation. Transactions of China Electrotechnical Society, 2018, 33(24): 5760-5767.
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2018, Vol. 33 
