Abstract
A new type of brushless double rotor machine (BDRM) is proposed in this paper. The BDRM is an important component in compound-structure permanent-magnet synchronous machine (CS-PMSM) systems, which are promising for power-split hybrid electric vehicle (HEV) applications. The BDRM can realize the speed adjustment between claw-pole rotor and permanent-magnet rotor without brushes and slip rings. The structural characteristics of the BDRM are described and its magnetic circuit model is built. Reactance parameters of the BDRM are deduced by an analytical method. It is found that the size characteristics of the BDRM are different from those of conventional machines. The new sizing and torque equations are analyzed and the theoretical results are used in the optimization process. Studies of the analytical magnetic circuit and finite element method (FEM) model show that the BDRM tends to have high leakage flux and low power factor, and then the method to obtain high power factor is discussed. Furthermore, a practical methodology of the BDRM design is developed, which includes an analytical tool, 2D field calculation and performance evaluation by 3D field calculation. Finally, different topologies of the BDRM are compared and an optimum prototype is designed.
Highlights
The power-split hybrid drive system which employs the planetary gear and two electric machines is the most advanced and successful electric drive system among hybrid systems at present
Compared with planetary gear unit, the compound-structure permanent-magnet synchronous machine (CS-PMSM) is a competitive concept for hybrid electric vehicle (HEV) drivetrain due to its compact structure and high efficiency [5,6,7]
Results from analytical and finite element method (FEM) calculation show that the power factor of brushless double rotor machine (BDRM), about 0.5~0.75, is low
Summary
The power-split hybrid drive system which employs the planetary gear and two electric machines is the most advanced and successful electric drive system among hybrid systems at present. Another power-split hybrid system which is called compound-structure permanent-magnet synchronous machine (CS-PMSM) system in this paper represents a new development direction in the field of hybrid systems [1,2,3,4] It employs a generator and a motor to adjust the torque and speed difference between the engine and the load, providing the function of the continuously variable transmission (CVT). Compared with planetary gear unit, the CS-PMSM is a competitive concept for hybrid electric vehicle (HEV) drivetrain due to its compact structure and high efficiency [5,6,7] It has a significant disadvantage: the rotating windings need brushes and slip rings. All the above advantages make the BDRM promising for power-split HEV applications
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