トルクリプルの小さいEPS用スロットレスモータの開発

抄録

　As the quality characteristics of electric power steering (EPS) motors, the high average torque, small torque ripple, and small cogging torque are required. This paper develops a slot-less permanent magnet (PM) synchronous motor for EPS motor, which has theoretically 0 cogging torque. Basic dimensions are determined by two-dimensional finite element (2-D FE) analysis. The characteristic of the designed motor is analyzed by the 3-D FE analysis. The use of soft magnetic composite is proposed. The proposed slot-less motor is fabricated. The characteristic of the motor driven by a sensor-less control is clarified. The torque ripple is smaller than that of the commercialized EPS motor.