| Switched reluctance motor(SRM)is a kind of doubly-salient-structure motors.The centralized windings are adopted in the stator poles,and no windings or permanent magnets are required in the rotor poles.It has attracted widespread concerns from scholars and entrepreneurs both here and abroad due to a series of advantages,such as low cost,high reliability,high starting torque,excellent fault-tolerance ability and broad governor deflection.The two-phase 4/2-pole high-speed SRM are more cost-effectively applied in high-speed unidirectional applications,such as electric tools,juicers,vacuum cleaners,fans and pumps.However,the torque dead zone and torque ripple issues are more prominent.In order to solve the torque dead zone and torque ripple issues in the traditional two-phase 4/2-pole high-speed SRM,the influencing factors are analyzed and a multi-stepped air gap scheme is put forward.To obtain the optimal length of stepped-air gap for different orders,the relation curve is built between the length of stepped-air gap and the winding inductance.In addition,the static torque ripple coefficient and static average torque are proposed to evaluate the starting capacity and output capacity for the two-phase SRM.The dynamic torque characteristics are simulated for the stepped-air gap SRM with different orders.The simulation results verify the effectiveness of the optimized multi-stepped air gap design.Based on the optimized two-phase 4/2-pole high-speed SRM,the finite element field-circuit coupling simulation model is built to simulate the basic performance.Based on the current characteristic table and the torque characteristic table,the simulation system is built in Matlab/Simulink to simulate the basic control strategy of two-phase 4/2-pole high-speed SRM.Finally,the experimental platform is built based on the DSP control chip.The no-load and load tests are carried out to verify the validity and feasibility of the design and simulation. |
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