Multi-phase Flexible Brushless DC Motor And Its Control Syste

Multi-phase brushless DC motor(BLDCM)have high reliability and strong fault tolerance and have outstanding advantages in applications such as ship propulsion,rail transit,and aerospace.However,with the increase in the number of motor phases,the complexity of the ontology design and control algorithm increases exponentially,so the research on the design and control methods of multi-phase motor has become an academic frontier in recent years.Aiming at the above problems,this paper proposes a multi-phase flexible BLDCM design and control method,which can solve the multi-phase motor control problem on the polynomial time scale and improve the operational performance of the motor.First,the design method of a multi-phase flexible BLDCM is proposed,and the distribution and arrangement of the armature windings is defined.Taking a nine-phase motor as an example,the winding arrangement and back-EMF characteristics of the flexible BLDCM are studied.The position sensor of the flexible BLDCM is designed,and the typical conduction mode and working principle of the flexible BLDCM is analyzed.Secondly,various conduction modes,control methods,and modulation strategies of multi-phase flexible BLDCM are studied.The operating characteristics of the motor under different conduction modes are analyzed,and the control method of the adaptive variable conduction mode is proposed.The advantages of the proposed ninephase flexible BLDCM in terms of power density and torque output stability are compared based on three sets of three-phase winding BLDCM.Finally,a nine-phase flexible BLDCM prototype was fabricated,and an experimental platform for the control system was built.And through steady-state and dynamic experiments,the feasibility and effectiveness of the proposed multi-phase flexible BLDCM design and control method are verified.