Real time recognition method for wide speed range rotor position of dual three-phase motor based on symmetrical voltage injection

The rotor position information is an important variable in the dual three-phase motor control system, and ensuring its real-time and accurate information is a prerequisite for the reliable operation of the dual three-phase motor system. The paper analyzes the structural characteristics of a dual three-phase permanent magnet synchronous motor (DTP-PMSM) with dual Y windings staggered by 30 °, and proposes a new high-frequency symmetrical voltage injection method that can effectively identify rotor position information in a wide speed range. It forms heterogeneous information verification with the hardware signal of the dual three-phase motor rotor position sensor, and improves the operational redundancy, fault identification ability, and functional safety level of the control system in applications that require high reliability. This method utilizes the structural features of DTP-PMSM and injects high-frequency pulse voltages with symmetric sequences into a synchronous rotating coordinate system to extract real-time rotor position information from the current response, improving adaptability to speed changes without generating torque disturbances; We constructed a DTP-PMSM mathematical model under high-frequency voltage injection, derived the mapping relationship between injection voltage and response current, and revealed the characteristic relationship between rotor position information and response current; Finally, the effectiveness and performance advantages of the proposed high-frequency rotating voltage injection method were verified through offline simulation and bench testing. The results indicate that this method can effectively extract high-precision rotor position information over a wide speed range, meeting the needs of monitoring rotor position sensor information and position control. The rotor position recognition accuracy of this method is high, and it also has good rotor position estimation performance during the steady-state and dynamic operation of the motor. The torque ripple generated by the injected signal of this method is small and has low disturbance characteristics.