| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor core which makes iron loss, cogging torque, distortion of induced voltage and torque ripple small and improves the motor efficiency. SOLUTION: The motor core is divided into laminated core pieces 12 by splitting sides 14 and each laminated core piece 12 is made of unidirectional rolled magnetic steel sheet or bidirectional rolled magnetic steel sheet. Each laminated core piece 12 is wound with a winding 15 through an insulation part 13, and laminated determining the easy magnetization direction 16 for every laminated core piece 12. Since the magnetic flux which passes in the laminated core piece 12 always flows in the easy magnetization direction 16 of the directional rolled magnetic steel sheet and the change of the magnetic flux direction which flows in the pole teeth and the air gaps when rotating becomes small, the iron loss, excitation current, cogging torque, distortion of the induced voltage and torque ripple can be made small and the efficiency of the motor can be improved.
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