Doubly salient motor fault-tolerant converter drive system and its control method

Abstract

The invention discloses a driving system for a fault-tolerant converter of a doubly salient motor and a control method of the driving system. The driving system is applicable to a single-tube open-short fault of a full-bridge converter or a double-tube open-short fault of the same bridge arm and an outgoing end open-short fault of a single-phase armature winding of the motor, and belongs to the technical field of motor control. The main body of the fault-tolerant converter comprises a four-phase full-bridge inverter, a four-phase armature winding of a doubly salient electro-magnetic motor (DSEM) and a bidirectional switch. When the doubly salient motor driving system normally runs, the bidirectional switch is switched off, the fault-tolerant converter outputs four phase symmetric rectangular wave currents with a different electrical angle of 90 degrees, the four phase symmetric rectangular wave currents are sequentially flown through the four-phase armature winding of the motor, and the motor is driven to run; and after an open-circuit fault is detected, fault-tolerant control is carried out, the fault-tolerant converter is switched to a fault-tolerant state from a fault state, and the motor is driven to stably run with the fault.

Description

technical field [0001] The invention relates to the technical field of special motor control, in particular to a topology and control method of a fault-tolerant converter in a four-phase electric excitation double salient motor drive system, which is suitable for full-bridge converters with single-tube open-circuit power tubes and double-salient power tubes in the same bridge arm. Fault conditions such as open circuit of the tube or open circuit of the outlet end of the single-phase winding. Background technique [0002] Electrically excited double salient pole motor (DSEM) is developed on the basis of switched reluctance motor and permanent magnet double salient pole motor. It has the advantages of simple structure, adjustable excitation, flexible control and good fault tolerance. Applications in fields requiring high reliability, such as starter power generation systems, electric vehicle drive systems, and ship drive systems, are becoming more and more widespread. In the ...

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Problems solved by technology

For example, the Chinese invention patent with the application number of 201310079451.4: four-phase double-salient pole brushless DC motor with symmetrical inductance of each phase discloses a motor topology using one field winding and three armature windings, which realizes the inductance symmetry of each phase The goal of this doubly salient pole motor is that the four-phase armature windings output force to the outside at any time, and the fault tolerance performance is good, but there is no fault-tolerant control method that involves how to deal with open-circuit faults such as single-tube, double-tube on the same bridge arm, and single-phase winding outlets.

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