Double-rotor disc self-excited retarder and control method thereof

Abstract

The invention discloses a double-rotor disc self-excited retarder and a control method thereof. The retarder, a generating set and two rotor discs are fixedly arranged on a transmission shaft of an automobile, wherein the two rotor discs are arranged on both sides of the retarder; the retarder comprises a retarder coil, a retarder coil iron core and a retarder bracket; the generating set comprises a permanent magnet, a generating set stator coil and a generating set shell; a control unit comprises an amplifying circuit, a voltage transformation rectifier and two relays; the transmission shaft of the automobile rotates to drive the permanent magnet to rotate; a three-phase alternating voltage generated by the generating set stator coil is input into the voltage transformation rectifier; a brake signal is input into the amplifying circuit, so that a normally open contact of a first relay is closed; the current of a storage battery is input into a second relay through the normally open contact of the first relay; the second relay switches on the retarder coil; and an electromagnetic braking torque generated by the rotor disc prevents the transmission shaft of the automobile from rotating. The retarder has the advantages of power generating and retarding functions, high system radiating performance and higher braking efficiency and chassis space utilization ratio.

Description

technical field [0001] The invention relates to an electric eddy current retarder for automobiles, in particular to a double-rotor disc self-excited retarder therein. Background technique [0002] The eddy current retarder occupies the largest proportion in my country's automobile retarder industry due to its simple structure, low manufacturing cost, short response time, easy intelligent control of braking torque, low failure rate, and convenient maintenance. The use of the eddy current retarder improves the braking stability, driving safety and ride comfort of the car. At present, the commonly used eddy current retarders are: 1. Squirrel cage self-excited retarder, whose power generation device is a squirrel cage generator; 2. Drum type self-excited retarder, based on the eddy current retarder 3. A retarder with an independent power supply, the main shaft of the power generation device and the transmission shaft of the vehicle are connected by belts or gears. However, the...

AI Technical Summary

Problems solved by technology

However, the negative impact of installing these eddy current retarders on the vehicle is also obvious. On the one hand, the eddy current retarder needs to consume a lot of electric energy when it works (the total excitation current is generally above 100A at the highest gear), which brings additional energy consumption

On the other hand, the huge current required for the operation of the eddy current retarder will have an impact on other on-board electrical equipment

After the passenger car is equipped with an eddy current retarder, the load on the generator and battery is increased, and the vehicle power supply circuit must be adjusted accordingly; in the case of improper power configuration or circuit design connection of the power supply equipment, the voltage of the electric system of the passenger car is slowed down by the eddy current retarder. When the device is working, there will be a sharp drop, causing the headlights to be significantly dimmed, and the video system will produce instantaneous black screens, messy interference stripes, and whistling noises in the speakers; the eddy current slowdown controlled by high-power semiconductor devices Speed ​​converter, its working current is PWM pulse current, which aggravates the influence of transient voltage in the bus electrical system, and the high-frequency harmonics with high amplitude contained in the working current make the on-board electronic equipment in a worse electromagnetic interference environment. Reduced electromagnetic compatibility of on-board electronic equipment

Furthermore, the heat dissipation effect of the existing retarder is not ideal, and the power generation device is greatly affected by the temperature of the retarder, which reduces the power generation performance of the power generation device and the braking performance of the retarder

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