Direct torque control method for high load capability of dual-three phase permanent magnet synchronous motor

Abstract

The invention provides a direct torque control method for the high load capability of a dual-three phase permanent magnet synchronous motor. Center points of two sets of windings of the dual-three phase permanent magnet synchronous motor are connected together, third and fifth harmonics in a high ratio are contained in the back electromotive force of the winding, a six-phase inverter is used to output a voltage vector, a direct control method on a dual-electromagnetic torque and a stator flux linkage is built in a fundamental wave plane and a fifth harmonic plane, and the electromagnetic torque in the fifth harmonic plane is used for enhancing the load capability of the motor. Peak current of a stator winding can be reduced, the center points of two sets of windings are connected together, and current flowing through a remaining healthy phase winding is used for enhancing the load capability in the case of motor winding fault.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a direct torque control method with high load capacity of a double-three-phase permanent magnet synchronous motor. Background technique [0002] The multi-phase permanent magnet synchronous motor drive system has the advantages of multi-degree-of-freedom control, so its drive system has high operational reliability. Even if the motor winding is out of phase or the inverter bridge arm is faulty, the fault-tolerant operation of the motor can still be realized with the help of the remaining control degrees of freedom. . Due to the use of permanent magnets for excitation, all the current flowing into the stator winding can be active components, thereby realizing high power factor operation on the stator side of the motor. Therefore, the multi-phase permanent magnet synchronous motor has unique application advantages in occasions requiring high reliability and high ...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this driving method that the center points of the two sets of windings are not connected is that one or two phases of the faulty three-phase system may still work, and if the current flows, the electromagnetic torque can still be output to drive the load; but if not work, obviously, the output torque capability of the entire drive system is reduced

[0004] Moreover, the traditional dual-three-phase permanent magnet synchronous motor has no magnetic circuit saliency phenomenon, and the electromagnetic torque of the motor is only generated by the interaction between the stator current and the magnetic field of the permanent magnet, and the load capacity of the motor is reduced

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