Staged start control system and method of three-stage brushless synchronous motor

Abstract

The invention discloses a staged start control system and method of a three-stage brushless synchronous motor. The three-stage brushless synchronous motor is composed of a permanent-magnet auxiliary exciter, a main exciter, a rotary rectifier and a main generator, a starting controller, a starting power unit and a power generation controller. The main exciter, the rotary rectifier and the main generator are connected in sequence. The starting controller leads alternating currents to an armature winding of the main generator at the starting stage of a starting power generation system and a reluctance torque is generated; and starting of the system at a zero-rotating speed is realized by the reluctance torque. When the motor obtains a certain rotating speed, the power generation controller leads direct currents to an excitation coil of the main exciter to provide excitation currents for the main generator, so that the current amplitude value to the armature winding of the main generatorby the starting controller is reduced substantially during the follow-up acceleration process. On the basis of the start control method, multiplexing of the power generation controller is realized; and the starting controller only needs one set of three-phase inverters to realize the starting function, so that the complexity of the whole system is reduced.

Description

technical field [0001] The invention relates to an aviation starting and generating system, in particular to a starting method of a three-stage brushless synchronous starting and generating system, including system structure and starting principle, and belongs to the technical field of aviation motors. Background technique [0002] At present, most aircraft AC power systems use a three-stage brushless synchronous motor as a generator, and the engine is started by a DC starter, an air turbine starter or a gas turbine starter. However, such a starting system has a large volume and weight and low reliability. A simple and feasible way to realize the integration of starting and power generation is to directly omit the special starter on the basis of the existing power supply system, and run the three-stage brushless synchronous generator in the electric state according to the principle of reversibility of the motor. to start the engine. [0003] However, when the three-stage b...

AI Technical Summary

Problems solved by technology

However, starting excitation is a key technology of the starting generator system, because it is difficult to excite in a static state.

In order to obtain a larger excitation current of the main motor, a complex stator structure of the main exciter and a large excitation current of the exciter are generally required, and the system structure is complex and the efficiency is low

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