WO2016065966A1 - 一种步进直线电机 - Google Patents

一种步进直线电机 Download PDF

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Publication number
WO2016065966A1
WO2016065966A1 PCT/CN2015/085968 CN2015085968W WO2016065966A1 WO 2016065966 A1 WO2016065966 A1 WO 2016065966A1 CN 2015085968 W CN2015085968 W CN 2015085968W WO 2016065966 A1 WO2016065966 A1 WO 2016065966A1
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WO
WIPO (PCT)
Prior art keywords
rotor shaft
screw
rotor
linear motor
plastic
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Application number
PCT/CN2015/085968
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English (en)
French (fr)
Inventor
曾凯
张小东
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上海鸣志电器股份有限公司
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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 WO2016065966A1 publication Critical patent/WO2016065966A1/zh

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    • 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 an electric machine, and more particularly to a stepping linear motor.
  • 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.
  • It is a stator
  • 2 is a rotor
  • 3 is a screw
  • 4 is a rotor shaft
  • 5 is a left end cover
  • 6 is a right end cover
  • 7 is a bearing.
  • direct threading inside 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.
  • the object of the present invention is to provide a stepping linear motor with high precision, good concentricity and good versatility in order to overcome the defects of the prior art described above.
  • a stepping linear motor comprising a stator, a rotor, a screw, a rotor shaft, a left end cover, a right end cover and a bearing, wherein the screw is drivingly connected to the rotor shaft, and the rotor shaft is connected to the rotor drive, and the bearing arrangement is At the two ends of the rotor shaft, the left end cover and the right end cover are respectively disposed at two ends of the stator to surround the rotor, wherein the motor further includes a plastic nut, and the rotor shaft is a hollow structure, and the The plastic nut is provided with a thread that matches the screw, and the screw is connected to the plastic nut and extends into the interior of the rotor shaft.
  • the rotor shaft side is provided with a through hole for fixing the plastic nut.
  • the plastic nut manufacturing process is as follows: a plastic piece is injection-molded through a through hole on the side of the rotor shaft, and a thread matching the screw is machined on the plastic part.
  • the plastic part is a plastic piece with or without holes.
  • the threads are machined by a shaped tool or wire tapping.
  • the plastic nut is made of PEEK material.
  • the present invention has the following advantages:
  • the mold structure is simple and reliable, avoiding complicated injection molding structure and greatly improving production efficiency.
  • FIG. 1 is a schematic structural view of a conventional stepping linear motor
  • FIG. 2 is a schematic structural view of a stepping linear motor according to the present invention.
  • FIG. 3 is a schematic structural view of a motor shaft and a plastic nut according to the present invention.
  • Figure 4 is a schematic view showing the structure of the plastic nut after the thread processing of the present invention.
  • a stepping linear motor includes 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 nut 8, and the screw 3 and Rotor shaft 4 drive
  • the rotor shaft 4 is drivingly connected to the rotor 2
  • the bearing 7 is disposed at two ends of the rotor shaft 4
  • the left end cover 5 and the right end cover 6 are respectively disposed at two ends of the stator 1 to surround the rotor 2
  • the plastic nut 8 is provided with a thread that matches the screw 3
  • the screw 3 is connected to the plastic nut 8 and extends into the interior of the rotor shaft 4.
  • the rotor shaft 4 is a hollow structure, which is used as an injection blank and is injection molded in a hollow shaft.
  • the side of the rotor shaft 4 is provided with a through hole for fixing the plastic nut 8.
  • the plastic nut 8 is manufactured as follows: a plastic piece is injection molded through a through hole on the side of the rotor shaft 4, and a thread matching the screw 3 is machined on the plastic part.
  • the plastic part is a plastic piece with or without holes.
  • the threads are machined by a shaped tool or wire tapping.
  • the plastic nut 8 is made of PEEK material and contains Tefflon, GF, CF and other components to help lubricate and improve the performance during temperature change.

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  • 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）、螺杆（3）、转子轴（4）、左端盖（5）、右端盖（6）和轴承（7），所述的螺杆（3）与转子轴（4）传动连接，所述的转子轴（4）与转子（2）传动连接，所述的轴承（7）设在转子轴（4）两端，所述的左端盖（5）和右端盖（6）分别设在定子（1）两端后包围转子（2），所述的电机还包括塑料螺母（8），所述的转子轴（4）为空心结构，所述的塑料螺母（8）设有与螺杆（3）匹配的螺纹，所述的螺杆（3）与塑料螺母（8）连接后伸入转子轴（4）内部。与现有技术相比，该步进直线电机具有精度高、同心度好、通用性好等优点。

Description

一种步进直线电机 技术领域
本发明涉及一种电机，尤其是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纹结构，然后再套入螺杆，以实现当电机旋转时带动螺杆前后运动，如附图1所示，其中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。但是在转子轴内部直接做螺纹，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纹件。而塑料和转子怎么连接，就成了各个厂家需要解决的问题。
现有产品的连接方式有两种：一种方法是将螺母和外面的转轴两个零件分别完成，再进行连接，存在连接可靠性问题。还有一种方法是将转子内部的螺纹直接注塑处理，但该种方法存在注塑螺纹尾牙齿形的完整性问题以及注塑变形造成的螺纹精度不足、同心度较差。
目前已有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螺纹件。目前的这种做法由于直接注塑出螺纹，会明显引起螺纹精度不足，同心度较差。
发明内容
本发明的目的就是为了克服上述现有技术存在的缺陷而提供一种精度高、同心度好、通用性好的步进直线电机。
本发明的目的可以通过以下技术方案来实现：
一种步进直线电机，包括定子、转子、螺杆、转子轴、左端盖、右端盖和轴承，所述的螺杆与转子轴传动连接，所述的转子轴与转子传动连接，所述的轴承设在转子轴两端，所述的左端盖和右端盖分别设在定子两端后包围转子，其特征在于，所述的电机还包括塑料螺母，所述的转子轴为空心结构，所述的 塑料螺母设有与螺杆匹配的螺纹，所述的螺杆与塑料螺母连接后伸入转子轴内部。
所述的转子轴侧面设有用于塑料螺母固定的通孔。
所述的塑料螺母制造过程如下：通过转子轴侧面的通孔进行注塑一段的塑料件，在塑料件上加工与螺杆匹配的螺纹。
所述的塑料件为带孔或不带孔的塑料件。
所述的螺纹通过成型的的刀具或者丝攻机械加工而成。
所述的塑料螺母采用PEEK材料制作而成。
与现有技术相比，本发明具有以下优点：
1)采用温度变形系数小易机加工的材料，例如PEEK，电机随温度产生的性能变化较小。
2)采用先注塑，然后车机械加工螺母的工艺方法，可以使螺母的精度高，同心度好。
3)本产品的螺母连接较为可靠，防转止动性能好。
4)模具结构简单可靠，避免了复杂的注塑结构，大大提高了生产效率。
5)通用性好，可以按照需要加工任意需要的螺母，利于对转轴及转子进行批量生产和大量库存。
附图说明
图1为现有步进直线电机的结构示意图；
图2为本发明步进直线电机的结构示意图；
图3为本发明电机轴与塑料螺母的结构示意图；
图4为本发明塑料螺母螺纹加工后的结构示意图。
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。
实施例
如图2-4所示，一种步进直线电机，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和塑料螺母8，所述的螺杆3与转子轴4传动 连接，所述的转子轴4与转子2传动连接，所述的轴承7设在转子轴4两端，所述的左端盖5和右端盖6分别设在定子1两端后包围转子2，所述的塑料螺母8设有与螺杆3匹配的螺纹，所述的螺杆3与塑料螺母8连接后伸入转子轴4内部。所述的转子轴4为空心结构，作注塑坯料，空心转轴内注塑。
所述的转子轴4侧面设有用于塑料螺母8固定的通孔。所述的塑料螺母8制造过程如下：通过转子轴4侧面的通孔进行注塑一段的塑料件，在塑料件上加工与螺杆3匹配的螺纹。
所述的塑料件为带孔或不带孔的塑料件。所述的螺纹通过成型的的刀具或者丝攻机械加工而成。所述的塑料螺母8采用PEEK材料制作而成含有Tefflon，GF，CF等成分用以帮助润滑，提高温变时的表现。

Claims (6)

  1. 一种步进直线电机，包括定子(1)、转子(2)、螺杆(3)、转子轴(4)、左端盖(5)、右端盖(6)和轴承(7)，所述的螺杆(3)与转子轴(4)传动连接，所述的转子轴(4)与转子(2)传动连接，所述的轴承(7)设在转子轴(4)两端，所述的左端盖(5)和右端盖(6)分别设在定子(1)两端后包围转子(2)，其特征在于，所述的电机还包括塑料螺母(8)，所述的转子轴(4)为空心结构，所述的塑料螺母(8)设有与螺杆(3)匹配的螺纹，所述的螺杆(3)与塑料螺母(8)连接后伸入转子轴(4)内部。
  2. 根据权利要求1所述的一种步进直线电机，其特征在于，所述的转子轴(4)侧面设有用于塑料螺母(8)固定的通孔。
  3. 根据权利要求2所述的一种步进直线电机，其特征在于，所述的塑料螺母(8)制造过程如下：通过转子轴(4)侧面的通孔进行注塑一段的塑料件，在塑料件上加工与螺杆(3)匹配的螺纹。
  4. 根据权利要求3所述的一种步进直线电机，其特征在于，所述的塑料件为带孔或不带孔的塑料件。
  5. 根据权利要求3所述的一种步进直线电机，其特征在于，所述的螺纹通过成型的的刀具或者丝攻机械加工而成。
  6. 根据权利要求1所述的一种步进直线电机，其特征在于，所述的塑料螺母(8)采用PEEK材料制作而成。
PCT/CN2015/085968 2014-10-31 2015-08-03 一种步进直线电机 WO2016065966A1 (zh)

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Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
CN104333194A (zh) * 2014-10-31 2015-02-04 上海鸣志电器股份有限公司 一种步进直线电机
CN108343686A (zh) * 2017-01-22 2018-07-31 上海鸣志电器股份有限公司 一种线性离合器
CN107839262A (zh) * 2017-12-04 2018-03-27 徐洪 一种peek/tpi合金螺杆及其注塑成型制备方法
CN108163704B (zh) * 2018-03-21 2023-11-17 成都金士力科技有限公司 一种用于高低温环境的三轴门架系统
CN110380591A (zh) * 2018-04-12 2019-10-25 上海鸣志电器股份有限公司 一种具有空心轴的步进直线电机
CN108973016B (zh) * 2018-09-14 2020-08-04 上海理工大学 直线电机驱动的高精密立式注塑机
CN113497519B (zh) * 2021-09-09 2021-11-09 中国空气动力研究与发展中心高速空气动力研究所 一种基于外部驱动式直线步进电机的驱动装置

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JP2007120659A (ja) * 2005-10-28 2007-05-17 Hitachi Ltd 回転直動変換機構の噛合い要素の製作方法
CN101815885A (zh) * 2007-08-01 2010-08-25 Skf公司 线性致动器
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