Starting power generation system for electric automobile

Abstract

The invention discloses a starting power generation system for an electric automobile, which comprises a double salient pole starting power generator, a starting power generation controller and controller working power; the starting power generation controller comprises a bidirectional power conversion circuit, an exciting current detection unit, an output current detection unit, an output voltage detection unit, a position rotation speed detection unit, an armature current detection unit, an exciting main circuit and a digital signal processor, wherein the exciting main circuit includes an exciting relay, a rectification filter unit and a chopper circuit which are connected in series in turn; and the digital signal processor is connected with the exciting current detection unit, the output current detection unit, the output voltage detection unit, the armature current detection unit, the position rotation speed detection unit, and the control ends of the bidirectional power conversion circuit, the exciting relay and the rectification filter unit by signals respectively. The invention also discloses an electric automobile and a control method thereof. Compared with the prior art, the starting power generation system is simple in structure, low in cost and flexible to control.

Description

technical field [0001] The invention relates to a starting and generating system, in particular to an electric vehicle starting and generating system. Background technique [0002] The starting and generating system is a core component of the automotive electrical system. In the traditional automotive electrical system, the starting and generating functions are completed by two independent subsystems of the DC starter and the alternator respectively. In order to reduce fuel consumption and improve efficiency, comfort and safety, modern automobiles increasingly use various electronically controlled auxiliary devices to replace mechanically driven auxiliary devices, which makes the electrical demand power continue to increase. The increase in the power requirements of the electrical system will cause the volume and weight of the generator, engine and starter to increase greatly, and new starting and power generation technologies must be adopted to improve the performance of t...

AI Technical Summary

Problems solved by technology

The permanent magnet motor is used as a starter generator, has no excitation winding loss, and has high efficiency and power density. However, the motor is excited by permanent magnets, so it is difficult to adjust the air gap magnetic field, and it is difficult to weaken the magnetic field during electric operation. control complexity

Moreover, as a national strategic resource, rare earth permanent magnet materials are strictly restricted in mining and sales. With the continuous rise in the price of rare earth permanent magnet materials, the manufacturing cost of permanent magnet motors continues to increase, which makes the cost of permanent magnet motor starter power generation systems rise.

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