Stator iron core used for stepping motor, stator comprising the same, and stepping motor

Abstract

The invention provides a stator iron core used for a stepping motor. The stator iron core comprises a yoke part and a plurality of tooth parts, wherein the plurality of tooth parts are connected to the yoke part and are arranged along the circumferential direction of the stator iron core; each tooth part is provided with concave parts and convex parts, wherein the concave parts and the convex parts are alternately arranged along the circumferential direction; each tooth part is provided with wide sub-tooth parts and narrow sub-tooth parts, wherein the wide sub-tooth parts and the narrow sub-tooth parts are arranged in an axial direction of the stator iron core; the tooth width of each wide sub-tooth part is greater than the tooth width ratio of each narrow sub-tooth part, and the tooth width ratio is restricted as a ratio of the center angle, which is relative to the axis of the stator iron core, of each convex part to the center angle, which is relative to the stator iron core, of each concave part. By use of the stator iron core, the stator iron cores of different specifications can permit to be conveniently manufactured by low cost. The invention also provides a stator comprising the stator iron core, and a stepping motor.

Description

technical field [0001] The invention relates to a stator iron core for a stepping motor, a stator including the same, and a stepping motor including the same. Background technique [0002] The stator core of a stepper motor is usually formed by stacking stator punches. The specifications of stator punching sheets in conventional hybrid stepping motors are consistent to form stator teeth with consistent tooth width along the axial direction of the stator core (such as figure 1 shown), the step angle is generally 1.8 degrees or 0.9 degrees. When the overall size of the motor, driving voltage and other parameters are the same, the pull-out torque of the hybrid stepping motor decreases with the increase of the driving frequency of the motor, and the larger the stator tooth width is, the more obvious the decrease is. [0003] To maximize the pull-out torque of the stepper motor, a stator core with a wider tooth width (the stator punches forming it have a wider tooth width) is s...

AI Technical Summary

Problems solved by technology

[0004] Due to the need to make multiple stator stamping dies with different tooth widths according to different driving frequency bands, it causes waste of dies and leads to higher cost of producing stepper motors

In addition, the size and shape of multiple stator stamping dies may have small differences, which will easily lead to inconvenient die management and use errors

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