Synchrous dynamo exciter of rotatable power electronic converter

Abstract

The excitation unit includes rotating transformer, electronic power and control circuit, and rotation diode rectification circuit. The electronic power and control circuit connected to primary winding and primary magnetic core of the rotating transformer is fixed on end plate of stator on synchro motor together. Secondary winding and secondary magnetic core of the rotating transformer are connected to the rotation diode rectification circuit. The rotation diode rectification circuit outputs exciting current to excitation coil of rotor in synchro motor. Secondary winding and secondary magnetic core and rotation diode rectification circuit are fixed on the rotor. There is air gap between primary magnetic core and secondary magnetic core, which are rotated relatively. The disclosed excitation unit of rotatable electronic converter supplies stable adjustable dc excitation for synchro motor, promoting competitive power of speed control system of synchro motor.

Description

1. Technical field [0001] The invention relates to an excitation device of a synchronous motor, in particular to a device for exciting a synchronous motor by using a power electronic converter. 2. Background technology [0002] Synchronous motor power generation operation (that is, synchronous generator) is the first choice for most power generation occasions. It is widely used from large generators with 100 megawatts to rectifier generators with more than 100 watts. In aviation, almost all modern aircraft power generators use synchronous generators. The excitation method of ordinary synchronous generators is: the winding is installed on the rotating rotor, the collector ring is installed on the rotating shaft, and the excitation DC is introduced through the brush. Because there is no back electromotive force in the excitation winding, the excitation capacity is small; compared with , AC excited motors (such as induction motors) require a larger excitation capacity. Howeve...

AI Technical Summary

Problems solved by technology

[0004] In summary, these brushless and exciterless synchronous motor solutions have the following defects: (1) Additional windings or additional devices are added, which increases the complexity of the motor structure, resulting in an increase in the volume and weight of the motor and a decrease in power density ; (2) The excitation current is not constant; (3) No excitation at zero speed and low speed; (4) The output voltage waveform deviates from sinusoidal; (5) The excitation adjustment is inconvenient; (6) Torque ripple; (7) The efficiency is low

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