Brushless parallel-structure hybrid excitation synchronous generator without additional air gap

Abstract

The invention relates to a brushless parallel-structure hybrid excitation synchronous generator without an additional air gap. The generator is composed of two parts, namely a permanent magnet motor (18) and an electrical excitation motor (19), wherein the permanent magnet motor (18) and the electrical excitation motor (19) are coaxially arranged in a shell (14) in parallel, the magnetic circuitsof the two parts are mutually independent, and an armature winding (5) is arranged in the stator core of the two parts. A triphase or multiphase exciting winding (10) is also arranged in an electrical excitation stator core (13), and an electrical excitation rotor (11) is a smooth cylinder formed by laminating round silicon steel sheets. The purpose of changing total electromotive force and output voltage is realized by changing current and phase in the exciting winding (10) by a frequency converter to regulate the magnitude and phase of the electrical excitation induction electromotive forcein the armature winding (5). Because the electrical excitation part is not provided with an additional air gap, magnetomotive force required by electrical excitation is small, and the regulation efficiency of the magnetic field is high. The electrical excitation magnetomotive force does not cause irreversible demagnetization to a permanent magnet, and brushless AC excitation is adopted to improvethe reliability of the motor.

Description

technical field [0001] The invention relates to a hybrid excitation synchronous motor, in particular to a parallel structure brushless and non-additional air gap hybrid excitation synchronous generator. Background technique [0002] The permanent magnet synchronous motor has the advantages of high reliability, high efficiency and small size, and has many advantages over the traditional electric excitation synchronous motor. 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 adv...

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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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