抄録
The authors have proposed the surface induction motor with a toroidal core as a primary core for twodimensional drive including rotating motion. In this paper, the characteristics of the surface motor (planar motor) with double layer armature winding at standstill are described. As the shape of primary member is circular, the rotating magnetic field can be generated in the same manner as a conventional rotating motor. For linear drive, the effective method for current supply is examined by studying current density distribution of primary winding, distribution of air gap flux density, thrust and normal force. As a result, to obtain larger thrust, it is effective that all coils are used and the flux has the magnetic pole common to both right and left windings at linear drive axis. In case of the change of drive direction, the current supply with adequate phase among right and left windings enables the variation of force for change of direction to be little. The transformation rate of thrust is shown which is the ratio of thrust to tangential force along circular core. To estimate the performance of the surface motor, it is compared with a singled-sided linear induction motor. The surface motor has larger thrust than the two linear motors with length of semicircle of the toroidal core in relatively small number of slots of primary core.
