Research on parameter Identification method of permanent magnet synchronous motor

Abstract

Rotary steerable system in directional drilling is considered the development trend of modern technology. A permanent magnet synchronous motor is used as an activation module in the rotary steerable system. However, the downhole environment is complex, and there are unknown disturbances, which puts higher requirements accurate motor control in directional drilling. Thus, it is essential to acquire precise measurements of motor parameters. This paper proposes a parameter identification method for a permanent magnet synchronous motor. Firstly, the resistance, DQ axis inductance, and flux linkage identification of permanent magnet synchronous motor are theoretically analyzed, and formulas are derived. Then the resistance, inductance, and flux linkage of the motor are simulated and analyzed by Simulink. The simulation results show that the maximum error of the parameter identification method is 2.25%; Finally, the parameter identification experiment is carried out on the actual motor with known parameters. The test data show that the maximum error of motor parameter identification is 2.5%. The experimental results show that the preliminary simulation and experimental results verify the feasibility and accuracy of the proposed identification method. This indicates that this paper's permanent magnet synchronous motor parameter identification method has a certain practical value.