关键词: 低电压转矩, 冲裁成型, 软磁性能, 退火处理

Abstract: The torque of the batch production motor at low voltage is much lower than the design value and the maximum deviation is as high as 30%. The R&D production motors work normally at the starting voltage of about 0.7 V, but the batch production motors cannot start. The torque of the batch production motors is lower than that of the R&D production ones at the same low voltage. By comparing the difference between the R&D production and the batch production process, it was found that the difference between the R&D production and the batch production process is only at stator manufacturing. During the R&D production, the stator core was made by linear cutting after the square sheets were stacked and formed. In batch production, the traditional blanking process was used, and then the sheets produced by blanking were stacked into the stator cores of the motor. It can be determined that the lower torque of this type of motors at low voltage was caused blanking process. The relevant process test verification was carried out, and it was confirmed that the huge stress during the blanking process would reduce the soft magnetic properties of the material. Annealing treatment was performed, and the problem of low torque at low voltage was effectively solved.

Key words: low voltage torque, punching forming, soft magnetic performance, annealing treatment