Motor internal stator and manufacturing method thereof

Abstract

An inner stator of a motor comprises a plurality of iron core stamped sheets which are mutually pressed and superimposed, and take on round shapes. The inner stator is characterized in that the iron core stamped sheets are formed by winding straight line type banded stamped sheets and turning excircle, and comprise a plurality of unit tooth blocks which are connected with each other; wherein, the adjacent two unit tooth blocks are connected with each other by a connecting part, and the inner edge of which is provided with a notch which can reduce the winding stress; each of the unit tooth blocks comprises a tooth crown, a tooth body and a tooth root, a winding groove which is provided with an opening at the position of the tooth root and is communicated with the notch is arranged between every two adjacent unit tooth blocks, the tooth roots of the adjacent unit tooth blocks are abut against each other after the banded stamped sheets are wound and molded, and the winding groove forms a closed slotted hole, through which a coil can pass. Compared with the prior art, the invention improves the utilization rate of the blanking material and winding efficiency, and reduces the difficulty for designing the winding groove; as the molded iron core winding groove is closed, the tooth space torque can be eliminated, and the vibration and noise caused by overlarge torque pulsation of the motor can be avoided. The invention discloses the inner stator of the motor and a manufacturing method thereof.

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