Advanced Angle Control Schemes for Stator Hybrid Excited Doubly Salient Motor Drive

A novel stator hybrid excited doubly salient (HEDS) brushless motor is presented in this paper. The topology and operation principle of the proposed motor are introduced. As supply to the HEDS motor drive system, a power converter with split capacitors is used and a basic current control method for this converter is explained. To achieve the maximum torque, an advanced angle control scheme is developed. Moreover, due to the asymmetry of the motor's electromagnetic parameters such as inductances, an unequal voltage distribution across the capacitors with the basic current control may occur. And the offset voltage of the centre-point may results in a poorer dynamic performance and low efficiency. To minimize the problems, a charge control strategy is developed. The two different strategies are implemented in an adjustable-speed drive and the steady-state and dynamic performances are analyzed. The results show that both control strategies improve the performance of the drive.