Electric excitation part double stator brushless mixed excitation synchronous generator

Abstract

The invention relates to an electric excitation part double stator brushless mixed excitation synchronous generator. The generator is composed of a permanent magnet synchronous motor (17) and an electric excitation part (18), magnetic circuits of the two parts are mutually independently, and an armature winding (5) is arranged in a stator core (9) of the permanent magnet part and an outer stator core (12) of the electric excitation part. The electric excitation part is provided with the outer stator core (12) and an inner stator core (11), and a three phase or multiphase exciting winding (10) is placed in the inner stator core (11). Magnitude and phase of current in the exciting winding (10) are changed by virtue of a frequency converter, so as to regulate magnitude and phase of electric excitation electromotive force in the armature winding (5), thus achieving the aim of adjusting total electromotive force and output voltage. The electric excitation part has no air gap, and magnetomotive force required by electric excitation is small, thus field adjustment efficiency is high. The electric excitation magnetomotive force can not cause irreversible demagnetization on permanent magnet, and brushless alternating current excitation is adopted, thus reliability of motor is high.

Description

technical field [0001] The invention relates to a hybrid excitation synchronous motor, in particular to a brushless hybrid excitation synchronous generator with double stators in the electric excitation part. Background technique [0002] Compared with the traditional electric excitation synchronous motor, the permanent magnet synchronous motor has the advantages of high reliability, high efficiency and small size. However, since the rotor of the permanent magnet motor is excited by permanent magnet steel, the air gap magnetic field is not easy to adjust. When operating as a generator, when the temperature rises, the permanent magnet steel will produce reversible demagnetization, which will reduce the output voltage of the generator. In addition, when When the generator load changes, especially when the inductive load increases, the output voltage decreases further. Generally, the voltage change rate of the permanent magnet generator is about ±10%, which has an adverse effe...

AI Technical Summary

Problems solved by technology

However, the electric excitation part adopts the claw pole motor structure. In addition to the working air gap, there are two additional air gaps on the electric excitation magnetic circuit, which consumes more electric excitation magnetomotive force and reduces the electric excitation efficiency.

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