Analysis of conductor induction voltage on computational-based synchronous electric motor performance

The often problem that is caused by the permanent magnet synchronous motor construction is an induced voltage on the rotor armature (conductor) that usually appears when the motor is working. The voltage on the rotor armature can directly cause shaft voltage and bearing current because they are mechanically connected. Shaft voltage is the highest cause of ball bearing damage in electric machines. This study focuses on analyzing the voltage on the rotor armature of an electric motor to be tested at rated speed. The research purpose is reached if the value of the armature voltage is still below the minimum value of the breakdown voltage on the shaft and the bearing lubricant. In this paper, the computational method used is the finite element analysis (FEA) method which will be executed using the software. The results of this study obtained a permanent magnet synchronous motor that has good performance with a current input of 1.5 kA in each phase that can run at 13300 rpm and produces a torque of 250 kNm. Flux is in a stable condition with a value of 0.02 Wb and forms an excellent magnetic field distribution on each stator coil so that the motor can operate without problems. The average maximum induced voltage on the rotor armature is 7.8 V, which appears at an angle of 91° - 93° in motor rotation.