A five-phase permanent magnet motor direct torque control maximum torque current ratio control method

Abstract

The invention discloses a maximum torque current ratio control method under the direct torque control of a five-phase permanent magnet motor. First, the motor speed is detected, and the given speed ω ref and feedback speed ω m For comparison, use the PI controller to get the reference torque T e_ref ; Pass the sampled phase current through the transformation matrix to obtain the primary space α‑β and the cubic space α of the two-phase static coordinate system 3 ‑β 3 current i α , i β , i α3 , i β3 ;Use the switching signal to calculate the calculated voltage u α , u β , u α3 , u β3 ; will i α , i β , u α , u β Input to the flux torque calculation module to obtain the motor stator flux ψ s and torque T e ; put ψ α , ψ β , i α , i β , input to the virtual signal module, and calculate the compensation flux linkage Δψ that makes the motor run at the MTPA point s ;Comparing the reference torque and flux linkage with the calculated motor torque and flux linkage, input them into the switch table to obtain the switching signals of each phase through the hysteresis controller, and control the motor through the inverter to realize the five-phase permanent MTPA control under magneto direct torque.

Description

technical field [0001] The invention relates to the field of multi-phase motor DTC control, in particular to a method for controlling the maximum torque-current ratio of a five-phase permanent magnet motor under DTC based on virtual signal injection. It is suitable for occasions with high energy demand and high efficiency requirements such as mining and iron smelting. Background technique [0002] The built-in permanent magnet synchronous motor (IPMSM) has the characteristics of high power density, high efficiency, high reliability, and wide constant power operating range, and is widely used in various industrial occasions. With the development of modern power electronic conversion technology and computer control theory, multi-phase motor drive system has been developed rapidly. Compared with three-phase internal magnet permanent magnet motors, multi-phase motors have higher power density and reliability, and are more suitable for aerospace, ship electric propulsion, electr...

AI Technical Summary

Problems solved by technology

Among them, the parameter method has higher requirements on the accuracy of motor parameters, the table method requires a lot of offline work and a large storage space, and the signal injection method will cause additional torque and current ripple.

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