Based On Electronic Differential Of Brushless DC Machine And Its Relevant Issues

Differential is to ensure that the wheel and the normal operation of vehicles must be more than two parts, it has played an important role in the process of vehicle steering.At present, most of the cars still uses a mechanical differential, it exists the following problems:(1) to ensure the vehicle’s fast smooth steering;(2) the heavier car body;Emerged in recent years, in order to solve the above problems, a new type of electronic differential.The electronic differential change by double motor drive control to realize the double speed to complete the vehicle’s steering, so as to improve the vehicle steering flexibility, reduces the own weight of the vehicle.So far, most electronic differential using ontology of motor is a brushless dc motor.A brushless dc motor for reversing problems affect the overload capacity and speed of the motor, and increases the maintenance cost.Aiming at the above problems, present a kind of electronic differential based on brushless dc motor.This new type of electronic differential because by electronic converter commutation, thus overcome the brushless dc motor is composed of electronic differential all is insufficient, therefore has attracted great attention to science and technology workers.In this paper, on the basis of the reading of vast amount of literature, for the brushless dc motor to realize two wheel drive electronic differential were studied, the specific content is as follows:According to the above problem, this paper proposes a new type of differential, which is based on electronic differential of brushless dc motor, abandoned the traditional reducer, clutch, reduce the quality of the body, can make to more quickly and smoothly, on the basis of the reading of vast amount of literature, this paper research content is as follows:(1) Studied two-wheeled electric vehicle electronic differential scheme, the scheme can meet the requirements of input Angle changes in scope;(2)In view of the four-wheel electric double rear wheel drive, realize the vehicle steering ackermann model is studied, at the speed of the vehicle four wheel respectively with a given input Angle and the relationship between the velocity amplitude.(3) Considering the electronic differential is implemented by the permanent magnet brushless dc motor, the paper discussed in permanent magnet brushless dc motor reversing problems, on the basis of the of the speed regulation system, and achieve positive & negative four quadrant operation process are discussed in this paper.(4) The paper in the end, implements a set of electronic differential of double brushless dc motor control scheme.And its validity is verified through the simulation.