Electric power steering apparatus

摘要

The power steering apparatus comprises a torque sensor (10) for detecting a steering torque applied to a steering wheel and a steering assist motor (24) which is driven to rotate based on the detected steering torque. The motor (24) is driven under field weakening control in a high-speed rotation area. The motor (24) is a brushless motor comprising a rotor having a plurality of permanent magnets which are respectively fixed in a plurality of recesses provided in a rotor core. With the electric power steering apparatus, a steer-assisting force can be obtained in high-speed steering. <IMAGE>