A six-phase sine wave doubly salient pole motor and its control system

Abstract

The invention discloses a six-phase sine wave double salient pole motor and its control system. The unit motor has a 12 / 10 pole structure, each excitation element is wound across six stator poles, and the directions of the magnetic fields generated by adjacent excitation coils are opposite. The armature coil is wound on the stator pole, and the winding direction is consistent with the magnetic field of the excitation coil of the winding chain. The armature coils with a phase difference of 180° in electrical angle are combined with each other and connected in reverse phase to form a six-phase armature winding. The rotor is extremely fan-shaped or T-shaped tooth structure, and adopts eccentric air gap pole arc, and the motor rotor is oblique pole structure. When the excitation element is excited, during the rotation of the rotor, a sine wave back EMF is induced in the armature winding, and the vector control method can be used to effectively solve the problem of large torque ripple in the square wave control of the traditional doubly salient pole motor, and The six-phase armature winding of the motor can flexibly form a three-phase, double three-phase redundant and six-phase fault-tolerant motor drive control system, which provides a new choice for high reliability and low torque ripple drive motors.

Description

technical field [0001] The invention relates to the technical field of special motor body design and control, in particular to a six-phase sine wave double salient pole motor and its control system. Background technique [0002] The doubly salient pole motor is a new type of motor consisting of a power electronic power converter, a controller, a permanent magnet or electromagnetic excitation unit, and a motor body with a salient pole stator and rotor structure. Doubly salient motors are divided into electric excitation doubly salient motors, permanent magnet doubly salient motors and hybrid excitation doubly salient motors, which have good application prospects in wind power, aviation and automobile industries. [0003] As a kind of reluctance motor, doubly salient motor has an inherent defect—the problem of large torque ripple, which has become the biggest obstacle to its application in the field of high-performance drive and servo. The traditional electric excitation doub...

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Problems solved by technology

There are also Chinese invention patents: a trapezoidal rotor tooth structure sinusoidal double salient pole motor and its design method, application number: 201410852974.2; Chinese invention patent: a segmented rotor tooth structure sinusoidal double salient pole motor and its design method , application number: 201610319506.8, both of which are based on the traditional three-phase double-salient pole motor to design the rotor structure to achieve sinusoidalization, but it increases the difficulty of rotor design and the complexity of the structure, and does not solve the problem of traditional three-phase electric excitation. Due to the three-phase armature winding of the excitation winding and the three-phase armature winding of the doubly salient pole motor, the stator coil of the stator winding of each phase is different from the distribution position of the excitation element, resulting in the inherent asymmetry of each phase, and the back electromotive force caused by the reluctance edge effect. Symmetry issues, which affect the sinusoidality of sinusoidal motors

[0005] The traditional three-phase electric excitation doubly salient pole motor usually adopts 6N / 4N pole structure (N is a positive integer), but the windings of this motor are mostly connected in star form, and no effective isolation is achieved between the phases. When a phase winding appears After a failure, the entire system will not work

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