Soft magnetic composite in design of motor with oscillatory starting

The aim of proposed paper is to increase magnetostatic torque of single-phase two-pole motor with oscillatory starting. Reference values of torque are based on two basic types of motor. First is composed of laminated stator core with sintered ferrite magnet rotor and second one is made from SMC stator core with sintered ferrite magnet rotor. To reduce rotor and stator production costs the composite materials were introduced. Preparation, production, physical properties and magnetic characteristics of plastic bonded NdFeB magnet and plastic bonded ferrite magnet are examined. Also, brief description of soft magnetic composite is done. The analyze involves two new geometries. First is double layer rotor with two different plastic bonded magnets. The outer layer is made from plastic bonded NdFeB magnet and inner one is made from plastic bonded ferrite magnet. The second type of rotor is composed of these two plastic bonded magnets mixed together in proper volumetric proportions. Calculated results show the improvements in torque production for both types of rotor and stator.