三相鼠笼异步电动机无传感器转速检测技术及其适应性OA

For the three-phase squirrel cage asynchronous motor sensorless fast Fourier transformation(FFT)speed measurement method,the number of rotor slots needs to be known in advance,and the test accuracy is easily affected by factors such as noise and acquisition time.Therefore,a sensorless high-precision speed detection method based on singular value decomposition(SVD)and the Prony algorithm is proposed.Based on the study of the mechanism of rotor slot harmonic speed measurement,the calculation method of integer multiple rotor slot number is given.The SVD method based on the singular value growth rate curve is used to filter the stator current and the Prony algorithm is used to identify the rotor slot harmonics to calculate the motor speed.By using finite element and numerical simulation methods,the adaptability of the proposed algorithm and analog-to-digital(A/D)acquisition is analyzed and studied under different operating conditions of the motor.The physical test platform is constructed and the YE90S-2 motor is measured.Simulation and experiment results show that under the same acquisition condition,the absolute error of the proposed method is only a fraction or even one tenth of the FFT speed measurement,and the test accuracy is greatly improved,which proves the correctness and accuracy of the proposed method.