Stator Phase Resistance Trade-off Between Output Torque and Braking Torque of PMSM

In this paper, the braking torque of the surface mounted permanent magnet (SPM) motor for the electric sliding plug door (ESPD) system of the rail transport is studied. When the three-phase armature coils are short- circuited, the braking torque should be small to ensure passengers can open the door by themselves. The relationship between the impedance of the three-phase armature coils and the braking torque is deduced. The variation law of motor stator phase resistance and braking torque is obtained. The output torque and braking torque of motor with different stator phase resistance is compared. The model of the motor is built. A prototype of 12-slot/10-pole surface mounted permanent magnet synchronous (SPM) motor is designed and manufactured. The results of the experiment agree well with the theoretical and FE-simulation results.