| 摘要 |
PROBLEM TO BE SOLVED: To improve efficiency of a motor by reducing an eddy current loss.SOLUTION: A motor armature is used for a motor and includes: a core 120 in which two or more electromagnetic steel sheets 122 are laminated and which includes teeth 12T extending in a radial direction of the motor; and a lead wire 121 which is wound around the teeth 12T in a circumferential direction. On a surface of the teeth 12T of the electromagnetic steel sheet 122, two or more first recesses extending in the radial direction are positioned. By using a picosecond pulse laser or a femtosecond pulse laser, the electromagnetic steel sheet 122 can be prevented from being distorted in processing the recess.SELECTED DRAWING: Figure 4 |
