Design of PM excited transverse flux linear motor with inner mover type

A transverse flux, PM-exited linear motor (TFM- LM) with inner mover was designed and built. Its output power density is higher and the weight is lower than for the equivalent, conventional PM excited linear synchronous motors (PM LSM). To get the maximum thrust force under the given volume, the thrust force density with respect to the ratio of the slot width and the length of pole pitch is analyzed by 3-dimension finite element method (FEM). Finally, calculated static thrust force matched with the experimental obtained static thrust force. The calculated and measured performance of transverse flux, PM-exited linear motor with inner mover revealed a great potential of system improvements by reducing mass of the linear motor. For examples, when this motor is applied to a ropeless elevator, it is possible to increase the power density by more than 400% than the conventional PM-LSM. The results of this study recommend this type of motor for the ropeless elevator or gearless direct linear driving system.