WO2026006997A1 - 步进电机 - Google Patents

步进电机

Info

Publication number
WO2026006997A1
WO2026006997A1 PCT/CN2024/103167 CN2024103167W WO2026006997A1 WO 2026006997 A1 WO2026006997 A1 WO 2026006997A1 CN 2024103167 W CN2024103167 W CN 2024103167W WO 2026006997 A1 WO2026006997 A1 WO 2026006997A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
cover plate
rotor magnet
fixed
claw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/103167
Other languages
English (en)
French (fr)
Inventor
储著明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AAC Microtech Changzhou Co Ltd
Original Assignee
AAC Microtech Changzhou Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AAC Microtech Changzhou Co Ltd filed Critical AAC Microtech Changzhou Co Ltd
Priority to PCT/CN2024/103167 priority Critical patent/WO2026006997A1/zh
Priority to US18/988,933 priority patent/US20260012071A1/en
Publication of WO2026006997A1 publication Critical patent/WO2026006997A1/zh
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
    • H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
    • H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
    • H02K37/14—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-pole type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
    • H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
    • H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor

Definitions

  • This invention relates to a motor device, and more particularly to a stepper motor.
  • Stepper motors are widely used in electric motors and generators due to their compact structure, high power density, high efficiency, and significant energy-saving benefits.
  • the industrial sector has seen an increasingly urgent demand for equipment that directly drives loads using stepper motors.
  • the widespread application of these stepper motor direct-drive devices will generate immeasurable energy-saving benefits.
  • Stepper motors typically consist of a rotor and a stator.
  • Claw-pole stepper motors have interlocking claw poles on the rotor. By setting different claw pole polarities, the rotor torque can be increased. However, the magnetic flux density of the claw poles in claw-pole stepper motors is relatively saturated due to torque requirements, resulting in significant torque fluctuations and affecting the actual motor performance.
  • the technical problem to be solved by the present invention is to provide a stepper motor with smaller torque fluctuations.
  • the present invention provides a stepper motor, which includes: a first cover plate, a second cover plate, and a stator and a rotor sandwiched between the first cover plate and the second cover plate.
  • the stator surrounds the rotor and is spaced apart from the rotor.
  • the stator has a plurality of claw poles extending along the rotor axis.
  • the rotor is supported on the first cover plate and the second cover plate and is rotatably connected to the first cover plate and the second cover plate.
  • the rotor includes a rotating shaft and a rotor magnet assembly sleeved and fixed to the rotating shaft;
  • the rotor magnet assembly includes a first rotor magnet assembly and a second rotor magnet assembly spaced apart along the axial direction of the rotating shaft.
  • the first rotor magnet assembly includes a first annular rotor magnet ring sleeved and fixed to the rotating shaft, and a first rotor magnet sleeved and fixed to the outer periphery of the first rotor magnet ring.
  • the second rotor magnet assembly includes a second annular rotor magnet ring sleeved and fixed to the rotating shaft, and a second rotor magnet sleeved and fixed to the outer periphery of the second rotor magnet ring.
  • the stator includes a first drive unit and a second drive unit distributed along the axial direction of the rotor.
  • the first drive unit is fixed to the first cover plate and arranged around the first rotor magnet
  • the second drive unit is fixed to the second cover plate and arranged around the second rotor magnet.
  • the rotor magnet assembly further includes a spacer ring sleeved and fixed to the rotating shaft and located between the first rotor magnet assembly and the second rotor magnet assembly.
  • the outer diameter of the first rotor magnetic ring is the same as the outer diameter of the second rotor magnetic ring
  • the outer diameter of the spacer is smaller than the outer diameter of the first rotor magnetic ring
  • the inner diameters of the first rotor magnetic ring, the second rotor magnetic ring, and the spacer are the same.
  • the first rotor magnet and the second rotor magnet have the same inner diameter and the same outer diameter.
  • the radial lengths of the first rotor magnet and the second rotor magnet are the same as the radial lengths of the first rotor magnetic ring and the second rotor magnetic ring.
  • the two ends of the rotating shaft pass through the first cover plate and the second cover plate respectively, and are rotatably connected to the first cover plate and the second cover plate respectively.
  • the stepper motor further includes a first bearing and a second bearing.
  • Grooves are provided at the rotatable connection points of the first cover plate and the second cover plate with the rotating shaft.
  • the outer peripheral side of the first bearing is fixed to the groove of the first cover plate, and the outer peripheral side of the second bearing is fixed to the groove of the second cover plate.
  • the two ends of the rotating shaft are respectively inserted and fixed to the inner peripheral side of the first bearing and the inner peripheral side of the second bearing.
  • the stator includes a plurality of claw-shaped halves, each claw-shaped halves having a plurality of claw poles.
  • the first drive unit includes a first cylindrical frame, a first coil, and a first stator magnetic ring.
  • the first stator magnetic ring is sleeved on the rotor and fixedly connected to the first cover plate.
  • the first stator magnetic ring includes a first claw-shaped half and a second claw-shaped half. The first claw-shaped half and the second claw-shaped half face each other and together form a cylindrical first receiving space.
  • the first cylindrical frame is fixed in the first receiving space, and the first coil is wound around the outer periphery of the first cylindrical frame.
  • the second drive unit includes a second cylindrical frame, a second coil, and a second stator magnetic ring.
  • the second stator magnetic ring is sleeved on the rotor and fixedly connected to the second cover plate.
  • the second stator magnetic ring includes a third claw-shaped half and a fourth claw-shaped half.
  • the third claw-shaped half and the fourth claw-shaped half face each other and together form a cylindrical second receiving space.
  • the second cylindrical frame is fixed in the second receiving space, and the second coil is wound around the outer periphery of the second cylindrical frame.
  • the stepper motor of the present invention includes: a first cover plate, a second cover plate, and a stator and a rotor sandwiched between the first cover plate and the second cover plate.
  • the stator surrounds the rotor and is spaced apart from the rotor.
  • the stator has a plurality of claw poles extending along the rotor axial direction.
  • the rotor is supported on the first cover plate and the second cover plate and is rotatably connected to the first cover plate and the second cover plate.
  • the stator is spaced apart around the rotor.
  • the rotor includes a rotating shaft supported on the first cover plate and the second cover plate and rotatably connected to the first cover plate and the second cover plate, and a rotor magnet assembly sleeved and fixed to the rotating shaft.
  • the rotor magnet assembly includes a shaft along the rotating shaft.
  • the stepper motor comprises a first rotor magnet assembly and a second rotor magnet assembly spaced apart.
  • the first rotor magnet assembly includes a first annular rotor magnet ring fixed to the rotating shaft and a first rotor magnet fixed to the outer periphery of the first rotor magnet ring.
  • the second rotor magnet assembly includes a second annular rotor magnet ring fixed to the rotating shaft and a second rotor magnet fixed to the outer periphery of the second rotor magnet ring.
  • the stator includes a first drive unit and a second drive unit distributed along the axial direction of the rotor.
  • the first drive unit is fixed to the first cover plate and surrounds the first rotor magnet ring
  • the second drive unit is fixed to the second cover plate and surrounds the second rotor magnet ring.
  • the rotor magnets adopt a segmented structure, with different rotor magnets corresponding to different drive units. Compared with a single rotor magnet, this reduces the volume, thus reducing the torque fluctuation of the rotor in the stepper motor.
  • this segmented rotor magnet structure can also reduce the rotor's moment of inertia and cogging torque, improving the motor's response speed, pull-in torque, and output torque, while reducing motor operating noise.
  • Figure 1 is a three-dimensional structural diagram of the stepper motor provided in an embodiment of the present invention.
  • Figure 2 is a cross-sectional view along line A-A in Figure 1;
  • Figure 3 is a three-dimensional exploded view of the stepper motor provided in an embodiment of the present invention.
  • An embodiment of the present invention provides a stepper motor 100, which includes: a first cover plate 1, a second cover plate 2, and a stator 4 and a rotor 3 sandwiched between the first cover plate 1 and the second cover plate 2.
  • the stator 4 surrounds the rotor 3 and is spaced apart from the rotor 3.
  • the stator 4 has a plurality of claw poles extending along the axial direction of the rotor 3.
  • the rotor 3 is supported on the first cover plate 1 and the second cover plate 2 and is rotatably connected to the first cover plate 1 and the second cover plate 2.
  • the rotor 3 includes a rotating shaft 31 and a rotor magnet assembly 32 sleeved and fixed to the rotating shaft 31;
  • the rotor magnet assembly 32 includes a first rotor magnet assembly 321 and a second rotor magnet assembly 322 spaced apart along the axial direction of the rotating shaft 31.
  • the first rotor magnet assembly 321 includes a first annular rotor magnet ring 3211 sleeved and fixed to the rotating shaft 31, and a first rotor magnet 3212 sleeved and fixed to the outer periphery of the first rotor magnet ring 3211.
  • the second rotor magnet assembly 322 includes a second annular rotor magnet ring 3221 sleeved and fixed to the rotating shaft 31, and a second rotor magnet 3222 sleeved and fixed to the outer periphery of the second rotor magnet ring 3221.
  • the stator 4 includes a first drive unit 41 and a second drive unit 42 distributed along the axial direction of the rotor 3.
  • the first drive unit 41 is fixed to the first cover plate 1 and arranged around the first rotor magnet 3212.
  • the second drive unit 42 is fixed to the second cover plate 2 and arranged around the second rotor magnet 3222.
  • the entire structure of the rotor magnet assembly 32 corresponds to the drive unit of the stator, eliminating the connection points between different drive units that cannot correspond when a single rotor magnet assembly is configured, thus reducing rotor rotation torque.
  • the rotor magnet assembly 32 further includes a spacer 323 sleeved and fixed to the rotating shaft 31 and located between the first rotor magnet assembly 321 and the second rotor magnet assembly 322.
  • the outer diameter of the first rotor magnetic ring 3211 is the same as the outer diameter of the second rotor magnetic ring 3221, and the outer diameter of the spacer is smaller than the outer diameter of the first rotor magnetic ring 3211.
  • the inner diameters of the first rotor magnetic ring 3211, the second rotor magnetic ring 3221, and the spacer are the same. This same inner diameter setting allows the rotating shaft 31 to fit snugly against the magnetic ring and the spacer, ensuring a good connection.
  • the first rotor magnet 3212 and the second rotor magnet 3222 have the same inner diameter and the same outer diameter.
  • the radial lengths of the first rotor magnet 3212 and the second rotor magnet 3222 are the same as the radial lengths of the first rotor magnetic ring 3211 and the second rotor magnetic ring 3221. Rotor magnets with the same radial length and outer diameter can ensure the stability of the rotor during rotation and guarantee the performance of the motor.
  • the first rotor magnetic ring 3211 and the second rotor magnetic ring 3221 are made of magnetically conductive material.
  • the first rotor magnet 3212 and the first rotor magnetic ring 3211, as well as the second rotor magnet 3222 and the second rotor magnetic ring 3221, are connected and fixed by glue or snap-fit.
  • the two ends of the rotating shaft 31 pass through the first cover plate 1 and the second cover plate 2 respectively, and are rotatably connected to the first cover plate 1 and the second cover plate 2 respectively.
  • the stepper motor 100 also includes a first bearing 5 and a second bearing 6.
  • the first cover plate 1 and the second cover plate 2 are provided with grooves at the rotatable connection points with the rotating shaft 31.
  • the outer peripheral side of the first bearing 5 is fixed to the groove of the first cover plate 1
  • the outer peripheral side of the second bearing 6 is fixed to the groove of the second cover plate 2.
  • the two ends of the rotating shaft 31 are respectively inserted and fixed to the inner peripheral side of the first bearing 5 and the inner peripheral side of the second bearing 6.
  • the stator 4 includes a plurality of claw-shaped halves, each claw-shaped halves having a plurality of claw poles.
  • the first driving unit 41 includes a first cylindrical frame 411, a first coil 412, and a first stator magnetic ring 413.
  • the first stator magnetic ring 413 is sleeved on the rotor 3 and fixedly connected to the first cover plate 1.
  • the first stator magnetic ring 413 includes a first claw-shaped half 4131 and a second claw-shaped half 4132.
  • the first claw-shaped half 4131 and the second claw-shaped half 4132 face each other and together form a cylindrical first receiving space.
  • the first cylindrical frame 411 is fixed in the first receiving space, and the first coil 412 is wound around the outer periphery of the first cylindrical frame 411.
  • the plurality of first claw poles 41311 on the first claw-shaped half 4131 and the plurality of second claw poles 41321 on the second claw-shaped half 4132 are arranged alternately to stabilize the magnetic field.
  • the stepper motor of the present invention includes: a first cover plate, a second cover plate, and a stator and a rotor sandwiched between the first cover plate and the second cover plate.
  • the stator surrounds the rotor and is spaced apart from the rotor.
  • the stator has a plurality of claw poles extending along the rotor axial direction.
  • the rotor is supported on the first cover plate and the second cover plate and is rotatably connected to the first cover plate and the second cover plate.
  • the stator is spaced apart around the rotor.
  • the rotor includes a rotating shaft supported on the first cover plate and the second cover plate and rotatably connected to the first cover plate and the second cover plate, and a rotor magnet assembly sleeved and fixed to the rotating shaft.
  • the rotor magnet assembly includes a shaft along the rotating shaft.
  • the stepper motor comprises a first rotor magnet assembly and a second rotor magnet assembly spaced apart.
  • the first rotor magnet assembly includes a first annular rotor magnet ring fixed to the rotating shaft and a first rotor magnet fixed to the outer periphery of the first rotor magnet ring.
  • the second rotor magnet assembly includes a second annular rotor magnet ring fixed to the rotating shaft and a second rotor magnet fixed to the outer periphery of the second rotor magnet ring.
  • the stator includes a first drive unit and a second drive unit distributed along the axial direction of the rotor.
  • the first drive unit is fixed to the first cover plate and surrounds the first rotor magnet ring
  • the second drive unit is fixed to the second cover plate and surrounds the second rotor magnet ring.
  • the rotor magnets adopt a segmented structure, with different rotor magnets corresponding to different drive units. Compared with a single rotor magnet, this reduces the volume, thus reducing the torque fluctuation of the rotor in the stepper motor.
  • this segmented rotor magnet structure can also reduce the rotor's moment of inertia and cogging torque, improving the motor's response speed, pull-in torque, and output torque, while reducing motor operating noise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

本发明提供了一种步进电机，其包括第一盖板、第二盖板以及夹设在第一盖板和第二盖板之间定子和转子，定子环绕转子并与转子间隔设置，定子具有沿转子轴向延伸的多个爪极，转子支撑于第一盖板、第二盖板并形成转动连接；转子包括转轴、以及套设固定于转轴的转子磁钢组件；转子磁钢组件包括间隔设置的第一转子磁钢组件和第二转子磁钢组件，其分别包括套设固定于转轴的呈环状的转子磁环、以及套设固定于转子磁环的外周的转子磁钢；定子包括分别固定于第一盖板、第二盖板的第一、第二驱动单元，第一驱动单元环绕第一转子磁钢设置，第二驱动单元环绕第二转子磁钢设置。与相关技术相比，本发明降低了步进电机的转矩波动。

Description

步进电机 技术领域
本发明涉及一种电机装置，尤其涉及一种步进电机。
 背景技术
步进电机由于结构紧凑，功率密度高、工作效率高、节能降耗效益显著，在电动机和发电机等领域得到了广泛的应用。近年来，工业领域对利用步进电机直接驱动负载工作的设备的需求越来越迫切，这些步进电机直驱设备的广泛应用，将产生不可估量的节能效益。
 技术问题
步进电机通常包括转子和定子，而爪极式的步进电机在转子上设置有相互配合的爪极，通过设置不同爪极的极性，可以提高转子的力矩。而相关技术中的爪极式步进电机的爪极的磁密因为力矩的要求会比较饱和，使得步进电机的转矩波动较大，影响了实际电机性能。
因此，有必要提供一种新的步进电机来改善上述问题。
 技术解决方案
本发明要解决的技术问题是提供一种转矩波动较小的步进电机。
为解决上述技术问题，本发明提供了一种步进电机，其包括：第一盖板、第二盖板以及夹设在所述第一盖板和所述第二盖板之间的定子和转子，所述定子环绕所述转子并与所述转子间隔设置，所述定子具有沿所述转子轴向延伸的多个爪极，所述转子支撑于所述第一盖板和所述第二盖板并与所述第一盖板和所述第二盖板形成转动连接；
所述转子包括转轴、以及套设固定于所述转轴的转子磁钢组件；
所述转子磁钢组件包括沿所述转轴的轴向间隔设置的第一转子磁钢组件和第二转子磁钢组件，所述第一转子磁钢组件包括套设固定于所述转轴的呈环状的第一转子磁环、以及套设固定于所述第一转子磁环的外周的第一转子磁钢；所述第二转子磁钢组件包括套设固定于所述转轴的呈环状的第二转子磁环、以及套设固定于所述第二转子磁环的外周的第二转子磁钢；
所述定子包括沿所述转子的轴向分布的第一驱动单元和第二驱动单元，所述第一驱动单元固定于所述第一盖板并环绕所述第一转子磁钢设置，所述第二驱动单元固定于所述第二盖板并环绕所述第二转子磁钢设置。
优选的，所述转子磁钢组件还包括套设固定于所述转轴并位于所述第一转子磁钢组件与所述第二转子磁钢组件之间的隔圈。
优选的，所述第一转子磁环的外径与所述第二转子磁环的外径相同，所述隔圈的外径小于所述第一转子磁环的外径，所述第一转子磁环、所述第二转子磁环、所述隔圈的内径相同。
优选的，所述第一转子磁钢和所述第二转子磁钢的内径相同，所述第一转子磁钢和所述第二转子磁钢的外径相同。
优选的，所述第一转子磁钢、所述第二转子磁钢的径向长度与所述第一转子磁环、所述第二转子磁环的径向长度均相同。
优选的，所述转轴的两端分别贯穿所述第一盖板和所述第二盖板，并分别与所述第一盖板和所述第二盖板形成转动连接。
优选的，所述步进电机还包括第一轴承和第二轴承，所述第一盖板和所述第二盖板与所述转轴的转动连接处均设置有凹槽，所述第一轴承的外周侧固定于所述第一盖板的凹槽处，所述第二轴承的外周侧固定于所述第二盖板的凹槽处；所述转轴的两端分别插设固定于所述第一轴承的内周侧和所述第二轴承的内周侧。
优选的，所述定子包括多个爪状半体，所述爪状半体具有多个所述爪极。
优选的，所述第一驱动单元包括第一筒状骨架、第一线圈以及第一定子磁环，所述第一定子磁环套设于所述转子并与所述第一盖板固定连接，所述第一定子磁环包括第一爪状半体和第二爪状半体，所述第一爪状半体和所述第二爪状半体相互正对并共同形成筒状的第一收容空间，所述第一筒状骨架固定于所述第一收容空间内，所述第一线圈绕设于所述第一筒状骨架的外周。
优选的，所述第二驱动单元包括第二筒状骨架、第二线圈以及第二定子磁环，所述第二定子磁环套设于所述转子并与所述第二盖板固定连接，所述第二定子磁环包括第三爪状半体和第四爪状半体，所述第三爪状半体和所述第四爪状半体相互正对并共同形成筒状的第二收容空间，所述第二筒状骨架固定于所述第二收容空间内，所述第二线圈绕设于所述第二筒状骨架的外周。
 有益效果
与相关技术相比，本发明步进电机中，其包括：第一盖板、第二盖板以及夹设在所述第一盖板和所述第二盖板之间的定子和转子，所述定子环绕所述转子并与所述转子间隔设置，所述定子具有沿所述转子轴向延伸的多个爪极，所述转子支撑于所述第一盖板和所述第二盖板并与所述第一盖板和所述第二盖板形成转动连接，所述定子间隔环绕所述转子设置；所述转子包括支撑于所述第一盖板和所述第二盖板并与所述第一盖板和所述第二盖板形成转动连接的转轴、以及套设固定于所述转轴的转子磁钢组件；所述转子磁钢组件包括沿所述转轴的轴向间隔设置的第一转子磁钢组件和第二转子磁钢组件，所述第一转子磁钢组件包括套设固定于所述转轴的呈环状的第一转子磁环、以及套设固定于所述第一转子磁环的外周的第一转子磁钢；所述第二转子磁钢组件包括套设固定于所述转轴的呈环状的第二转子磁环、以及套设固定于所述第二转子磁环的外周的第二转子磁钢；所述定子包括沿所述转子的轴向分布的第一驱动单元和第二驱动单元，所述第一驱动单元固定于所述第一盖板并环绕所述第一转子磁钢磁环设置，所述第二驱动单元固定于所述第二盖板并环绕所述第二转子磁钢磁环设置。上述结构中，转子磁钢采用分段式结构，不同转子磁钢分别对应不同驱动单元，相较于单个转子磁钢的方案减小了体积，因而降低了步进电机中转子的转矩波动，同时，该分段式转子磁钢结构还能够降低转子转动惯量以及齿槽转矩，提升了电机响应速度、牵入转矩输出转矩，减少了电机运行的噪音。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中：
图1为本发明实施例提供的步进电机的立体结构示意图；
图2为沿图1中A-A线的剖示图；
图3为本发明实施例提供的步进电机的立体结构分解示意图。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
请参阅图1-3所示，本发明实施例提供了一种步进电机100，其包括：第一盖板1、第二盖板2以及夹设在所述第一盖板1和所述第二盖板2之间的定子4和转子3，所述定子4环绕所述转子3并与所述转子3间隔设置，所述定子4具有沿所述转子3轴向延伸的多个爪极，所述转子3支撑于所述第一盖板1和所述第二盖板2并与所述第一盖板1和所述第二盖板2形成转动连接；
所述转子3包括转轴31、以及套设固定于所述转轴31的转子磁钢组件32；
所述转子磁钢组件32包括沿所述转轴31的轴向间隔设置的第一转子磁钢组件321和第二转子磁钢组件322，所述第一转子磁钢组件321包括套设固定于所述转轴31的呈环状的第一转子磁环3211、以及套设固定于所述第一转子磁环3211的外周的第一转子磁钢3212；所述第二转子磁钢组件322包括套设固定于所述转轴31的呈环状的第二转子磁环3221、以及套设固定于所述第二转子磁环3221的外周的第二转子磁钢3222；
所述定子4包括沿所述转子3的轴向分布的第一驱动单元41和第二驱动单元42，所述第一驱动单元41固定于所述第一盖板1并环绕所述第一转子磁钢3212设置，所述第二驱动单元42固定于所述第二盖板2并环绕所述第二转子磁钢3222设置。
通过这样的设置，所述转子磁钢组件32的结构整体均与定子部分的驱动单元对应，不存在单个转子磁钢组件结构设置时不同驱动单元之间无法对应的衔接部分，能够减少转子转动扭矩。
所述转子磁钢组件32还包括套设固定于所述转轴31并位于所述第一转子磁钢组件321与所述第二转子磁钢组件322之间的隔圈323。
所述第一转子磁环3211的外径与所述第二转子磁环3221的外径相同，所述隔圈的外径小于所述第一转子磁环3211的外径，所述第一转子磁环3211、所述第二转子磁环3221、所述隔圈的内径相同。相同内径的设置使得转轴31能够贴合磁环和隔圈，以保证连接效果。
所述第一转子磁钢3212和所述第二转子磁钢3222的内径相同，所述第一转子磁钢3212和所述第二转子磁钢3222的外径相同。
所述第一转子磁钢3212、所述第二转子磁钢3222的径向长度与所述第一转子磁环3211、所述第二转子磁环3221的径向长度均相同。相同径向长度和外径的转子磁钢能够保证转子旋转时的稳定性，保证电机性能。
所述第一转子磁环3211、所述第二转子磁环3221为导磁材料。
所述第一转子磁钢3212与所述第一转子磁环3211之间、以及所述第二转子磁钢3222磁环与所述第二转子磁环3221之间通过胶水连接固定或卡接固定。
所述转轴31的两端分别贯穿所述第一盖板1和所述第二盖板2，并分别与所述第一盖板1和所述第二盖板2形成转动连接。
所述步进电机100还包括第一轴承5和第二轴承6，所述第一盖板1和所述第二盖板2与所述转轴31的转动连接处均设置有凹槽，所述第一轴承5的外周侧固定于所述第一盖板1的凹槽处，所述第二轴承6的外周侧固定于所述第二盖板2的凹槽处；所述转轴31的两端分别插设固定于所述第一轴承5的内周侧和所述第二轴承6的内周侧。
所述定子4包括多个爪状半体，所述爪状半体具有多个所述爪极。
所述第一驱动单元41包括第一筒状骨架411、第一线圈412以及第一定子磁环413，所述第一定子磁环413套设于所述转子3并与所述第一盖板1固定连接，所述第一定子磁环413包括第一爪状半体4131和第二爪状半体4132，所述第一爪状半体4131和所述第二爪状半体4132相互正对并共同形成筒状的第一收容空间，所述第一筒状骨架411固定于所述第一收容空间内，所述第一线圈412绕设于所述第一筒状骨架411的外周。所述第一爪状半体4131上的多个第一爪极41311与所述第二爪状半体4132上的多个第二爪极41321在设置时交错排列，使得磁场稳定。
所述第二驱动单元42包括第二筒状骨架421、第二线圈422以及第二定子磁环423，所述第二定子磁环423套设于所述转子3并与所述第二盖板2固定连接，所述第二定子磁环423包括第三爪状半体4231和第四爪状半体4232，所述第三爪状半体4231和所述第四爪状半体4232相互正对并共同形成筒状的第二收容空间，所述第二筒状骨架421固定于所述第二收容空间内，所述第二线圈422绕设于所述第二筒状骨架421的外周。所述第三爪状半体4231上的多个第三爪极42311与所述第四爪状半体4232上的多个第四爪极42321在设置时交错排列，使得磁场稳定。
与相关技术相比，本发明步进电机中，其包括：第一盖板、第二盖板以及夹设在所述第一盖板和所述第二盖板之间的定子和转子，所述定子环绕所述转子并与所述转子间隔设置，所述定子具有沿所述转子轴向延伸的多个爪极，所述转子支撑于所述第一盖板和所述第二盖板并与所述第一盖板和所述第二盖板形成转动连接，所述定子间隔环绕所述转子设置；所述转子包括支撑于所述第一盖板和所述第二盖板并与所述第一盖板和所述第二盖板形成转动连接的转轴、以及套设固定于所述转轴的转子磁钢组件；所述转子磁钢组件包括沿所述转轴的轴向间隔设置的第一转子磁钢组件和第二转子磁钢组件，所述第一转子磁钢组件包括套设固定于所述转轴的呈环状的第一转子磁环、以及套设固定于所述第一转子磁环的外周的第一转子磁钢；所述第二转子磁钢组件包括套设固定于所述转轴的呈环状的第二转子磁环、以及套设固定于所述第二转子磁环的外周的第二转子磁钢；所述定子包括沿所述转子的轴向分布的第一驱动单元和第二驱动单元，所述第一驱动单元固定于所述第一盖板并环绕所述第一转子磁钢磁环设置，所述第二驱动单元固定于所述第二盖板并环绕所述第二转子磁钢磁环设置。上述结构中，转子磁钢采用分段式结构，不同转子磁钢分别对应不同驱动单元，相较于单个转子磁钢的方案减小了体积，因而降低了步进电机中转子的转矩波动，同时，该分段式转子磁钢结构还能够降低转子转动惯量以及齿槽转矩，提升了电机响应速度、牵入转矩输出转矩，减少了电机运行的噪音。
以上所述的仅是本发明的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出改进，但这些均属于本发明的保护范围。

Claims (10)

  1. 一种步进电机，其包括：第一盖板、第二盖板以及夹设在所述第一盖板和所述第二盖板之间的定子和转子，所述定子环绕所述转子并与所述转子间隔设置，所述定子具有沿所述转子轴向延伸的多个爪极，所述转子支撑于所述第一盖板和所述第二盖板并与所述第一盖板和所述第二盖板形成转动连接；
    所述转子包括转轴、以及套设固定于所述转轴的转子磁钢组件，其特征在于，
    所述转子磁钢组件包括沿所述转轴的轴向间隔设置的第一转子磁钢组件和第二转子磁钢组件，所述第一转子磁钢组件包括套设固定于所述转轴的呈环状的第一转子磁环、以及套设固定于所述第一转子磁环的外周的第一转子磁钢；所述第二转子磁钢组件包括套设固定于所述转轴的呈环状的第二转子磁环、以及套设固定于所述第二转子磁环的外周的第二转子磁钢；
    所述定子包括沿所述转子的轴向分布的第一驱动单元和第二驱动单元，所述第一驱动单元固定于所述第一盖板并环绕所述第一转子磁钢设置，所述第二驱动单元固定于所述第二盖板并环绕所述第二转子磁钢设置。
  2. 根据权利要求1所述的步进电机，其特征在于，所述转子磁钢组件还包括套设固定于所述转轴并位于所述第一转子磁钢组件与所述第二转子磁钢组件之间的隔圈。
  3. 根据权利要求2所述的步进电机，其特征在于，所述第一转子磁环的外径与所述第二转子磁环的外径相同，所述隔圈的外径小于所述第一转子磁环的外径，所述第一转子磁环、所述第二转子磁环、所述隔圈的内径相同。
  4. 根据权利要求3所述的步进电机，其特征在于，所述第一转子磁钢和所述第二转子磁钢的内径相同，所述第一转子磁钢和所述第二转子磁钢的外径相同。
  5. 根据权利要求3所述的步进电机，其特征在于，所述第一转子磁钢、所述第二转子磁钢的径向长度与所述第一转子磁环、所述第二转子磁环的径向长度均相同。
  6. 根据权利要求1所述的步进电机，其特征在于，所述转轴的两端分别贯穿所述第一盖板和所述第二盖板，并分别与所述第一盖板和所述第二盖板形成转动连接。
  7. 根据权利要求1所述的步进电机，其特征在于，所述步进电机还包括第一轴承和第二轴承，所述第一盖板和所述第二盖板与所述转轴的转动连接处均设置有凹槽，所述第一轴承的外周侧固定于所述第一盖板的凹槽处，所述第二轴承的外周侧固定于所述第二盖板的凹槽处；所述转轴的两端分别插设固定于所述第一轴承的内周侧和所述第二轴承的内周侧。
  8. 根据权利要求1所述的步进电机，其特征在于，所述定子包括多个爪状半体，所述爪状半体具有多个所述爪极。
  9. 根据权利要求8所述的步进电机，其特征在于，所述第一驱动单元包括第一筒状骨架、第一线圈以及第一定子磁环，所述第一定子磁环套设于所述转子并与所述第一盖板固定连接，所述第一定子磁环包括第一爪状半体和第二爪状半体，所述第一爪状半体和所述第二爪状半体相互正对并共同形成筒状的第一收容空间，所述第一筒状骨架固定于所述第一收容空间内，所述第一线圈绕设于所述第一筒状骨架的外周。
  10. 根据权利要求8所述的步进电机，其特征在于，所述第二驱动单元包括第二筒状骨架、第二线圈以及第二定子磁环，所述第二定子磁环套设于所述转子并与所述第二盖板固定连接，所述第二定子磁环包括第三爪状半体和第四爪状半体，所述第三爪状半体和所述第四爪状半体相互正对并共同形成筒状的第二收容空间，所述第二筒状骨架固定于所述第二收容空间内，所述第二线圈绕设于所述第二筒状骨架的外周。
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JP2003009499A (ja) * 2001-06-22 2003-01-10 Minebea Co Ltd クローポール型ステッピングモータのモータ構造
TW201110508A (en) * 2009-09-07 2011-03-16 Tricore Corp Micro stepping motor without pulsation
CN203151355U (zh) * 2013-02-06 2013-08-21 无锡钧弘自动化科技有限公司 一种永磁式爪极步进电机
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