WO2014012409A1 - 步进直线电机 - Google Patents

步进直线电机 Download PDF

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Publication number
WO2014012409A1
WO2014012409A1 PCT/CN2013/077579 CN2013077579W WO2014012409A1 WO 2014012409 A1 WO2014012409 A1 WO 2014012409A1 CN 2013077579 W CN2013077579 W CN 2013077579W WO 2014012409 A1 WO2014012409 A1 WO 2014012409A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
rotor shaft
concave
screw
convex structure
Prior art date
Application number
PCT/CN2013/077579
Other languages
English (en)
French (fr)
Inventor
吴永松
曾凯
Original Assignee
上海鸣志电器股份有限公司
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 上海鸣志电器股份有限公司 filed Critical 上海鸣志电器股份有限公司
Publication of WO2014012409A1 publication Critical patent/WO2014012409A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa

Definitions

  • the present invention relates to electrical machines, and more particularly to a stepping linear motor. Background technique
  • a stepping linear motor is a motor that converts rotational motion into a linear motion through a screw.
  • the prior art stepping linear motor is made into an internal thread structure by rotating the inside of the rotor shaft, and then inserted into the screw to realize the forward and backward movement of the screw when the motor rotates, as shown in FIG.
  • direct threading in the inner part of the rotor shaft results in a shortened life of the rotor.
  • the improved method is to embed a plastic screw with self-lubricating function in the rotor shaft. How to connect plastics and rotors has become a problem that various manufacturers need to solve.
  • One prior art approach is to make a plurality of through holes around the center of the rotor shaft, and then directly insert the plastic inner nuts into the rotor shaft through the through holes, as shown in FIG. In this way, since a plurality of through holes are formed in the periphery of the shaft, the strength of the rotor is insufficient, and the processing precision of the rotor in the latter stage is low.
  • 1 is the stator
  • 2 is the rotor
  • 3 is the screw
  • 4 is the rotor shaft
  • 5 is the left end cover
  • 6 is the right end cover
  • 7 is the bearing
  • 8 is the plastic inner nut.
  • a stepping linear motor including a stator, a rotor, a rotor shaft and a screw, a plastic inner nut for connecting with the screw drive is arranged in the rotor shaft; wherein the rotor shaft is a metal hollow shaft, and a ring groove for inserting a plastic inner nut is arranged on the inner wall of the metal hollow shaft, and the ring groove wall is provided There is a concave-convex structure for preventing radial rotation and axial movement of the plastic inner nut, and the plastic inner nut is fitted in the annular groove and engaged with the concave-convex structure.
  • the relief structure includes at least one groove that is not connected end to end and/or at least one boss that is not connected end to end.
  • the concave-convex structure is a cross-shaped mesh thread.
  • the service life of the rotor is high.
  • the anti-rotation and stop performance is good, and the strength of the injection nut is high.
  • FIG. 1 and 2 are schematic structural views of a prior art stepping linear motor
  • FIG. 3 and FIG. 4 are schematic structural views of a rotor shaft according to an embodiment of the present invention.
  • FIG. 5 and FIG. 6 are schematic structural views of a rotor shaft according to another embodiment of the present invention.
  • Figure 7 is a schematic view showing the assembly of the stepping linear motor of the present invention. detailed description
  • the stepping linear motor of the present invention comprises a stator 1, a rotor 2, a screw 3, a rotor shaft 4, a left end cover 5, a right end cover 6, a bearing 7 and a plastic inner nut 8.
  • the plastic inner nut 8 is embedded in the rotor shaft 4 and is drivingly connected to the screw 3.
  • the rotor shaft 4 of the present invention is a metal hollow shaft, and an annular groove 41 for inserting a plastic inner nut is arranged on the inner wall of the metal hollow shaft, and the ring groove wall is provided.
  • the relief structure of an embodiment of the present invention includes at least one groove 42 that is not connected end to end and/or at least one boss 43 that is not connected end to end.
  • a concave-convex structure according to a preferred embodiment of the present invention is a cross-arranged mesh thread 44.
  • the manufacturing method of the invention adopts a hollow shaft of metal and is processed on the inner wall of the metal shaft ( Grooves, ribs, engraved or threaded, etc., forming some grooves or bosses that are not flat with respect to the inner wall, and then injection molding from the side of the hollow shaft to form a plastic inner nut 8, a groove formed by the inner wall of the metal hollow shaft Or the boss has a function of stopping and anti-rotation of the inner nut of the injection molding, thereby ensuring the perfect molding of the inner nut of the injection molding and the good strength during use thereof.
  • an intersecting mesh thread is provided on the inner wall of the hollow shaft, and the structure has good stopping and anti-rotation effects, and is extremely advantageous for processing and mass production, and then enters the hollow shaft.
  • the inner nut 8 is formed by injection molding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transmission Devices (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

一种步进直线电机，包括定子（1）、转子（2）、转子轴（4）和螺杆（3），在转子轴（4）内设有用于与螺杆（3）传动相连的塑料内螺母（8）；转子轴（4）为金属空心轴，在金属空心轴的内壁设有用于嵌装塑料内螺母（8）的环槽（41），环槽壁上设有用于防止塑料内螺母（8）径向转动和轴向移动的凹凸结构（42、43），塑料内螺母（8）嵌装在该环槽（41）内并与凹凸结构（42、43）啮合。直线电机的转子及注塑螺母强度高，使用寿命长，传动效率高，发热较小。

Description

歩进直线电
技术领域
本发明涉及电机， 尤其涉及一种步进直线电机。 背景技术
步进直线电机是将旋转运动通过螺杆转换为直线运动的电机。 现有技术的 步进直线电机是通过将作旋转运动的转子轴内部做成内螺紋结构， 然后再套入 螺杆， 以实现当电机旋转时带动螺杆前后运动， 如图 1所示。 但是在转子轴内 部直接做螺紋， 会导致转子的寿命缩短。 改进的做法是在转子轴内嵌入一个带 自润滑功能的塑料螺紋件。 而塑料和转子怎么连接， 就成了各个厂家需要解决 的问题。
现有技术的一种做法是在转子轴中心周边打多个通孔， 然后通过这些通孔 在转子轴内直接注塑成型塑料内螺母， 如图 2所示。 这种做法由于在轴的周边 打了多个通孔， 导致转子的强度不够， 后期的转子加工精度低。
图 1、 图 2中所示， 1为定子， 2为转子， 3为螺杆， 4为转子轴， 5为左端 盖， 6为右端盖， 7为轴承， 8为塑料内螺母。 发明内容
本发明的目的， 就是为了解决上述现有技术存在的问题， 提供一种步进直 为了达到上述目的， 本发明采用了以下技术方案： 一种步进直线电机， 包 括定子、 转子、 转子轴和螺杆， 在转子轴内设有用于与螺杆传动相连的塑料内 螺母； 其中的转子轴为金属空心轴， 在金属空心轴的内壁设有用于嵌装塑料内 螺母的环槽， 环槽壁上设有用于防止塑料内螺母径向转动和轴向移动的凹凸结 构， 所述的塑料内螺母嵌装在该环槽内并与凹凸结构啮合。
所述的凹凸结构包括至少一条首尾不连通的凹槽和 /或至少一条首尾不连 接的凸台。 所述的凹凸结构为交叉设置的网状螺紋。
本发明步进直线电机由于采用了了以上技术方案，具有以下的优点和特点：
1.转子的使用寿命较高。
2.防转止动性能好， 注塑螺母强度高。
3.传动效率较高， 发热较小。
4.注塑成型度好，传动精度较高。
5.利于对转子轴及转子进行批量生产和大量库存， 可以通过注塑不同的塑 料内螺母来应对不同导程要求的客户， 具有通用性。 附图说明
图 1、 图 2为现有技术步进直线电机的结构示意图；
图 3、 图 4为本发明中一实施例的转子轴的结构示意图；
图 5、 图 6为本发明中另一实施例的转子轴的结构示意图;
图 7为本发明步进直线电机的装配示意图。 具体实施方式
下面结合附图和具体实施例对本发明进行详细说明。
参见图 7、 本发明的步进直线电机， 包括定子 1、 转子 2、 螺杆 3、 转子轴 4、左端盖 5、 右端盖 6、 轴承 7和塑料内螺母 8。 塑料内螺母 8嵌装在转子轴 4 内并与螺杆 3传动相连。
配合参见图 3、 图 4、 图 5、 图 6， 本发明中的转子轴 4为金属空心轴， 在 金属空心轴的内壁设有用于嵌装塑料内螺母的环槽 41，环槽壁上设有用于防止 塑料内螺母径向转动和轴向移动的凹凸结构， 塑料内螺母 8 嵌装在该环槽 41 内并与凹凸结构啮合。
配合参见图 3、图 4，本发明一实施例的凹凸结构包括至少一条首尾不连通 的凹槽 42和 /或至少一条首尾不连接的凸台 43。
配合参见图 5、 图 6， 本发明一较佳实施例的凹凸结构为交叉设置的网状 螺紋 44。
本发明的制造方法是，采用金属的空心转轴，并在金属转轴内壁做处理（打 槽、 筋、 刻花或做螺紋等）， 形成相对于内壁不平整的一些凹槽或者凸台， 然后 从空心轴的旁边进行注塑并形成塑料内螺母 8， 金属空心轴内壁加工出的凹槽 或者凸台对注塑内螺母具有止动和防转的作用， 从而保证注塑内螺母的完好成 型以及其在使用过程中的良好强度。 本发明的一个较佳实施例是， 在空心轴内 壁设置交叉的网状螺紋， 此种结构具有良好的止动和防转作用， 且极为利于加 工和大批量生产， 然后再在空心轴旁边进料并进行注塑形成内螺母 8。

Claims

权 利 要 求
1、 一种步进直线电机， 包括定子、 转子、 转子轴和螺杆， 在转子轴内设有 用于与螺杆传动相连的塑料内螺母；其特征在于：所述的转子轴为金属空心轴， 在金属空心轴的内壁设有用于嵌装塑料内螺母的环槽， 环槽壁上设有用于防止 塑料内螺母径向转动和轴向移动的凹凸结构， 所述的塑料内螺母嵌装在该环槽 内并与凹凸结构啮合。
2、根据权利要求 1所述的步进直线电机， 其特征在于： 所述的凹凸结构包 括至少一条首尾不连通的凹槽和 /或至少一条首尾不连接的凸台。
3、根据权利要求 1所述的步进直线电机， 其特征在于： 所述的凹凸结构为 交叉设置的网状螺紋。
PCT/CN2013/077579 2012-07-18 2013-06-20 步进直线电机 WO2014012409A1 (zh)

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CN201210249560.1A CN103580370B (zh) 2012-07-18 2012-07-18 步进直线电机

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CN104009580A (zh) * 2014-06-16 2014-08-27 高如军 空心轴电动机
CN106655607A (zh) * 2015-10-30 2017-05-10 北京精密机电控制设备研究所 一种集成丝杠的转子组件
CN109050354B (zh) * 2018-08-28 2021-01-05 延锋安道拓座椅机械部件有限公司 一种电动滑轨
CN109861448B (zh) * 2019-01-24 2021-04-13 沈阳新松机器人自动化股份有限公司 一种小型高扭矩水平旋转提升电机
WO2023061497A1 (zh) * 2021-10-17 2023-04-20 常州姆驰机电有限公司 采用塑料螺母的对开槽式推杆装置

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JPH03293947A (ja) * 1990-04-11 1991-12-25 Yaskawa Electric Corp 電動直線駆動装置
CN2240632Y (zh) * 1995-09-11 1996-11-20 唐宗才 复合式自锁螺杆
WO2005050062A1 (en) * 2003-10-31 2005-06-02 Aktiebolaget Skf A linear ballscrew actuator with a safety unlocking device
CN101873051A (zh) * 2009-04-27 2010-10-27 上海鸣志电器有限公司 步进直线电机
CN202798312U (zh) * 2012-07-18 2013-03-13 上海鸣志电器股份有限公司 步进直线电机

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03293947A (ja) * 1990-04-11 1991-12-25 Yaskawa Electric Corp 電動直線駆動装置
CN2240632Y (zh) * 1995-09-11 1996-11-20 唐宗才 复合式自锁螺杆
WO2005050062A1 (en) * 2003-10-31 2005-06-02 Aktiebolaget Skf A linear ballscrew actuator with a safety unlocking device
CN101873051A (zh) * 2009-04-27 2010-10-27 上海鸣志电器有限公司 步进直线电机
CN202798312U (zh) * 2012-07-18 2013-03-13 上海鸣志电器股份有限公司 步进直线电机

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CN103580370B (zh) 2016-08-03

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