Research On A Doubly-salient Permanent-magnet Double-rotor Motor Applied For Hybrid Electric Vehicles

With the rapid development of hybrid electric vehicle (HEV), power hybrid system attracts more and more attention and becomes research hotspot of HEV field. Currently, there are two types of power hybrid system. The core component of the mechanical power hybrid system is the planet gear unit. The mechanical power hybrid system is the main type and has been successfully applied to the HEV. Another power hybrid system is the electromagnetic one based on the double-rotor motor (DRM). With the DRM, electromagnetic coupling mode is used to realize power transmitting, coupling and distributing. The planetary gear unit is replaced by the DRM which provide more efficient solutions for power hybrid system.In this paper, a new Double-Salient Permanent-Magnet Double-Rotor Motor (DSPM-DRM) is studied which is applied for electromagnetic power hybrid system. The main results of the research include the following aspects:1. A novel DSPM-DRM with unique configuration is presented which has two rotors and two air gaps. The permanent magnets are embedded in the stator and the inner rotor. By using a finite element method (FEM), the electromagnetic performance of the DSPM-DRM is investigated. Besides, the coupling degree of internal and external magnetic field is evaluated which lay the foundation for the DSPM-DRM model establishment and the motor drive control realization.2. The electromagnetic analysis method and the optimization design method of the DSPM-DRM are proposed. On the base of the DSPM-DRM operating principle, the sizing equation is derived and the initial design dimensions are determined with reference to the stator permanent magnet motor. To reduce the torque ripple and enhance the torque density, the parametric model of the DSPM-DRM is built up. Genetic algorithm (GA), as an optimization design tool is used on the design approach which performed on the DSPM-DRM. Then an experimental prototype motor is designed and manufactured which has a mixture of more than 50%.3. The model of the DSPM-DRM is set up in Matlab Simulink. The control strategies are studied and the multi operational modes of the DSPM-DRM in HEV application are analyzed and simulated.4. By performing the redevelopment in ADVISOR software, the DSPM-DRM HEV model is established and the performances of the DSPM-DRM HEV are simulated and compared with the current mainstream of the HEV. The simulated results illustrate the outstanding features of the power hybrid system based on the DSPM-DRM and verify the feasibility of the application of DSPM-DRM in HEV.5. A DSPM-DRM prototype machine is fabricated and the test bench of the power hybrid system is implemented. The experiments about some operational modes such as starting, pure electric driving and hybrid driving are accomplished. The experimental results verify the validity of the theoretical analysis, the prototype design and the rationality of driving control strategy, which are helpful on further studying the DSPM-DRM used for HEV.