US-20260128655-A1 - STEPPER MOTOR AND WINDING DEVICE

US20260128655A1US 20260128655 A1US20260128655 A1US 20260128655A1US-20260128655-A1

Abstract

The present disclosure provides a stepper motor and a winding device. The stepper motor includes: two plates arranged opposite to each other; a rotary shaft having two ends supported on the two plates, respectively; a magnet sleeved and fixed on an outer periphery of the rotary shaft; and a stator unit sleeved on the rotary shaft. The the stator unit includes windings arranged to space from the magnet. Each winding includes a respective casing that is hollow and arranged between the two plates, a respective claw pole fixed at an end of the respective casing and coaxial with the respective casing, and a respective coil wound on an outer periphery of the respective claw pole, and two ends of the respective coil extend outside the respective casing, respectively. The respective casing and portions of the respective claw pole in contact with the respective coil are coated with insulating coatings.

Inventors

Feng Yan
Junxiang Han
Junsheng Wang

Assignees

AAC MICROTECH (CHANGZHOU) CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20250124

Claims (9)

1 . A stepper motor, comprising: two plates arranged opposite to each other; a rotary shaft having two ends supported on and in rotational connection with the two plates, respectively; a magnet sleeved and fixed on an outer periphery of the rotary shaft; and a stator unit sleeved on the rotary shaft; wherein the two plates are arranged on both sides of the magnet in an axial direction of the rotary shaft and arranged to space from the magnet, and the stator unit comprises windings arranged to space from the magnet and fixed between the two plates; wherein each winding of the windings comprises a respective casing that is hollow and arranged between the two plates, a respective claw pole fixed at an end of the respective casing and coaxial with the respective casing, and a respective coil wound on an outer periphery of the respective claw pole, and two ends of the respective coil extend outside the respective casing, respectively; and wherein the respective casing and portions of the respective claw pole in contact with the respective coil are coated with insulating coatings.
2 . The stepper motor according to claim 1 , wherein the respective claw pole comprises a fixing portion fixed at the end of the respective casing and having an annular shape and a plurality of extension portions extending from an inner periphery of the fixing portion and along an axial direction of the respective claw pole, the plurality of extension portions are arranged at intervals, and the respective coil is wound and fixed on outer peripheries of the plurality of extension portions.
3 . The stepper motor according to claim 2 , wherein the respective casing comprises a hollow cylinder, a first fixing portion having an annular shape and extending inward from an end of the cylinder away from the respective claw pole, and a plurality of first extension portions extending from an inner periphery of the first fixing portion and along an axial direction of the respective casing, and the plurality of first extension portions are arranged at intervals; and wherein each first extension portion of the plurality of first extension portions extends between two respective adjacent extension portions of the plurality of extension portions of the respective claw pole, and the respective claw pole is fixed at an end of the cylinder.
4 . The stepper motor according to claim 2 , wherein the respective claw pole further comprises an engagement portion extending outward from an outer periphery of the fixing portion and to outside of the respective casing; wherein each winding of the windings further comprises a respective sheet-form frame, the respective sheet-form frame comprises a platform portion stacked and fixed on a side of the fixing portion facing the plurality of extension portions, a protruding portion extending from an outer periphery of the platform portion and stacked and fixed on the engagement portion, and two winding columns extending from a side of the protruding portion away from the platform portion, the two winding columns space from each other, and the two ends of the respective coil are wound on the two winding columns, respectively.
5 . The stepper motor according to claim 4 , wherein a recessed wiring groove is defined on a surface of the protruding portion away from the fixing portion, and the wiring groove extends from the inner periphery of the fixing portion to one winding column of the two winding columns.
6 . The stepper motor according to claim 4 , wherein the respective sheet-form frame further comprises a limit portion formed by extending a portion of the protruding portion facing the engagement portion, and the engagement portion is receivable in the limit portion, allowing the limiting portion is located in a same plane as the fixing portion.
7 . The stepper motor according to claim 2 , wherein an insulating coating coated on the respective claw pole covers the plurality of extension portions.
8 . The stepper motor according to claim 2 , comprising a plurality of windings arranged in sequence along the axial direction of the rotary shaft, wherein two respective fixing portions of every two adjacent windings of the plurality of windings abut against each other and are fixed to each other by welding.
9 . A winding device, applicable to the stepper motor according to claim 2 , wherein the winding device comprises a hollow sleeve and a mandrel inserted in the sleeve; wherein the mandrel comprises a first section, a second section, and a third section, the third section has an outer diameter larger than an outer diameter of the second section, and the first section has an outer diameter smaller than the outer diameter of the second section; wherein the first section is configured for the respective claw pole to sleeve on the first section, the second section has extension grooves that are formed by depressions defined on an outer surface of the second section and fit with the plurality of extension portions of the respective claw pole, and the third section is configured for the sleeve to sleeve on the third section; and wherein the respective claw pole is configured to sleeve on the first section by engaging each extension portion of the plurality of extension portions into a respective extension groove of the extension grooves.

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present application is a continuation of PCT Patent Application No. PCT/CN2024/130485, filed Nov. 7, 2024, which is incorporated by reference herein in its entirety. TECHNICAL FIELD The present disclosure relates to the field of motor technology, and in particular to a stepper motor and a winding device. BACKGROUND The stepper motors have been widely used in fields such as electric motors and generators due to their high working efficiency and energy-saving advantages. A stepper motor mainly includes a rotary shaft, magnets fixed to the outer periphery of the rotary shaft, and windings sleeved on the rotary shaft. A winding mainly includes a casing sleeved on the rotary shaft and being in rotational connection with the rotary shaft, a claw pole fixed to and coaxial with the casing, an insulation frame fixed to the outer periphery of the claw pole, and a coil fixed to the outer periphery of the frame. In the related technologies, due to the insulation frame arranged between the claw pole and the coil of the stepper motor, the effective arrangement space of the stepper motor is reduced, and the torque of the stepper motor will be reduced on condition of unchanged volume. Therefore, it is necessary to provide a new stepper motor and a winding device to address the above-mentioned technical problem. SUMMARY The present disclosure aims to provide a new stepper motor and a winding device, in order to address the problem in related technologies that the effective arrangement space of the stepper motor is reduced, and the torque of the stepper motor is reduced on condition of unchanged volume. To this end, in a first aspect, the present disclosure provides a stepper motor including: two plates arranged opposite to each other; a rotary shaft having two ends supported on and in rotational connection with the two plates, respectively; a magnet sleeved and fixed on an outer periphery of the rotary shaft; and a stator unit sleeved on the rotary shaft. The two plates are arranged on both sides of the magnet in an axial direction of the rotary shaft and arranged to space from the magnet, and the stator unit includes windings arranged to space from the magnet and fixed between the two plates. Each winding of the windings includes a respective casing that is hollow and arranged between the two plates, a respective claw pole fixed at an end of the respective casing and coaxial with the respective casing, and a respective coil wound on an outer periphery of the respective claw pole, and two ends of the respective coil extend outside the respective casing, respectively. The respective casing and portions of the respective claw pole in contact with the respective coil are coated with insulating coatings. As an improvement, the respective claw pole includes a fixing portion fixed at the end of the respective casing and having an annular shape and a plurality of extension portions extending from an inner periphery of the fixing portion and along an axial direction of the respective claw pole, the plurality of extension portions are arranged at intervals, and the respective coil is wound and fixed on outer peripheries of the plurality of extension portions. As an improvement, the respective casing includes a hollow cylinder, a first fixing portion having an annular shape and extending inward from an end of the cylinder away from the respective claw pole, and a plurality of first extension portions extending from an inner periphery of the first fixing portion and along an axial direction of the respective casing, and the plurality of first extension portions are arranged at intervals. Each first extension portion of the plurality of first extension portions extends between two respective adjacent extension portions of the plurality of extension portions of the respective claw pole, and the respective claw pole is fixed at an end of the cylinder. As an improvement, the respective claw pole further includes an engagement portion extending outward from an outer periphery of the fixing portion and to outside of the respective casing. Each winding of the windings further includes a respective sheet-form frame, the respective sheet-form frame includes a platform portion stacked and fixed on a side of the fixing portion facing the plurality of extension portions, a protruding portion extending from an outer periphery of the platform portion and stacked and fixed on the engagement portion, and two winding columns extending from a side of the protruding portion away from the platform portion, the two winding columns space from each other, and the two ends of the respective coil are wound on the two winding columns, respectively. As an improvement, a recessed wiring groove is defined on a surface of the protruding portion away from the fixing portion, and the wiring groove extends from the inner periphery of the fixing portion to one winding column of the two winding columns. As an improvement, the