Phase fracturing type two-phase exciter and starting control method

Abstract

The invention discloses a phase fracturing type two-phase exciter and a starting control method. The phase fracturing type two-phase exciter is a rotating armature type electro-magnetic synchronous motor and is of a non-salient pole structure. Two phases of symmetric windings are placed on a stator, and the phase difference of the axes of the two phases of symmetric windings in space is a 90-degree electrical angle. An AC capacitor is singly connected into one phase of winding in series, and is connected with two phase lines or a phase line and a neutral line of a three-phase AC starting powersource. Through the phase fracturing effect of the AC capacitor, the exciter generates an oval or even circular magnetic field under a single-phase AC excitation condition, the counter potential obtained by a three-phase armature winding of a rotor of the exciter is improved, the excitation efficiency is improved, and the excitation currents of a main motor during starting are increased. Comparedwith a traditional single-phase AC exercitation method, the problems that single-phase AC exercitation currents and power are insufficient in the whole starting process of a three-stage brushless synchronous motor are solved, particularly under a static and low-speed condition, the starting control method is simple and reliable, switching is easy, and the starting and power generating integratedfunction is achieved.

Description

technical field [0001] The invention relates to an exciter and an excitation control method for an aviation three-stage starter generator, belonging to the field of aviation three-stage starter generator systems. Background technique [0002] With the continuous development of aviation power supply technology, the power supply system of large civil aircraft is gradually transitioning from the existing constant speed and constant frequency, variable speed and constant speed to variable frequency AC and high voltage DC power supply systems. Regardless of whether the aviation power supply system adopts a frequency conversion AC system or a high-voltage DC system, most of the main power supplies of aviation aircraft currently use a three-stage brushless synchronous motor, which is mainly composed of a permanent magnet exciter PMG, an exciter, a rotating rectifier and a main motor. Among them, PMG is a rotating magnetic pole type permanent magnet synchronous motor, the main motor...

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Problems solved by technology

[0005] In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a split-phase two-phase exciter and a starting excitation control method based on the theory of two-phase symmetrical currents to generate a rotating magnetic field, which solves the problem of three-stage brushless In the starting process of synchronous motors, the single-phase excitation power is insufficient and the two-phase symmetrical excitation control is complex. Especially at static and low speeds, the integrated function of starting and generating can be realized. It is used in the starting and generating systems of aviation main power and auxiliary power units has important application value in

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