Control method for permanent magnetic synchronous generator of automobile

Abstract

The invention discloses a control method for a permanent magnetic synchronous generator of an automobile. The permanent magnetic synchronous generator is driven to generate power by use of an automobile prime motor and stably outputs 42V DC voltages after passing through a PWM rectifier, and after an automobile storage battery is charged, power is supplied to an automobile load. The method has the following advantages: 1, the problem in the prior art is solved that rectifier control of a permanent magnetic synchronous generator needs a high-precision absolute position encoder and other devices for detecting the position of a rotor magnetic pole, the interference immunity of a system is improved, and the system cost is decreased; 2, the design is reasonable, the practicality is high, and the operation is simple; 3, weak-magnetic control of the generator at a high speed is realized through closed-loop control, and stability of DC-side voltages in case of the high speed is realized; and 4, DC drift caused by a pure integrator is effectively inhibited by replacing the pure integrator with a variable-frequency filter.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a control method for a permanent magnet synchronous generator used in automobiles. Background technique [0002] Some existing automobile generators generally use the claw-pole synchronous generator system, and the diode full-bridge rectifier can be used to obtain 14v DC power supply to charge the 12v lead-acid battery and supply power to the electric load. The efficiency of the 14v claw-pole synchronous generator system On the low side (about 50%), its power is generally less than 2kW. In recent years, with modern automobile ventilation and air conditioning, brake anti-lock braking system, electronic ignition device, heating, automobile safety and fault diagnosis system, automobile information system, With the widespread use of automobile comfort and entertainment products, the electricity consumption of automobiles has increased rapidly. If a 14v claw pole synchronous gene...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a control method for permanent magnet synchronous generators used in automobiles, which solves the problem in the prior art that the rectification system control of permanent magnet synchronous generators requires high-precision absolute encoders to detect permanent magnets. Position, and involves complex coordinate rotation transformation, which reduces the execution efficiency of the program

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