ELECTRIC MOTOR AND ELECTRIC POWER STEERING DEVICE

摘要

An electric motor (9) has a core (22) formed by a magnetic material having a hysteresis ratio not greater than 67% against the entire iron loss W expressed as a total of a hysteresis loss Wh and an eddy current loss We which has been measured under the condition of the frequency 50 Hz and a magnetic flux density 1.5 T. Thus, when the electric motor (9) is built in a power steering device (1), it is possible to reduce the loss torque of the electric motor (9), increase torque, and prevent increase of cogging torque.