Study On Hybrid Power System With The Permanent Magnet Brushless Double Rotor Motor

With the stress on the global oil resource and the increasingly serious air pollution, the global auto industry is being on a techincal revolution on new energy. HEV with advantages of both internal-combustion engine and electric motor, will be more and more important in the global auto industry for a long time. Electromechanical coupling drive is the core technology of HEV. Nowadays, HEVs are either with too complex structure, high price and maintenance cost, or fixed in mild hybrid and not obvious in fuel economy. To this end we have invented a permanent magnet brushless double-rotor motor.This brushless double-rotor motor consists of one stator and two rotors. The inside rotor is made of permanent-magnetic material. The windings on the inner and outer of the cup-shaped rotor are joined in negative-phase. The two rotors are non-coaxial connected in structure. The double-rotor motor can be regarded as a compound motor, which is made up of an induction motor(the outside of the cup-shaped rotor windings and the stator) and a permanent magnet synchronous motor(the inside of the cup-shaped rotor and the permanent-magnetic rotor). The thesis establishes a unified coordinate system on the cup rotor winding, and obtains a mathematical dynamic model for the motor. According to the dual synchronous coordinate system model of the brushless doubly-fed machine and the motor field oriented control strategy, the control strategy of the permanent magnet rotor can be derived.Based on the theoretical analysis and the control block diagram drawn, the double-rotor motor dedicated a converter and a software program are designed. Primary circuit, detection circuitry, communication circuit, selection of related devices, software flow patter, SVPWM, and PI controller are introduced in this paper. We imitate vehicle operational states by the greatest extent through the test bed of this project we built, including starting the engine, energizing a battery when quiescence, driven only by battery-powered, speeding up, deceleration energy feedback, and so on.Basic functions which can be realized can be derived through the simulation of the motor and the test bed. Therefore, it has some advantages such as simple configuration, high efficiency, reasonable Power allotment ratio and so on. The system can also operate as a device with continuously variable function.