CN216531044U

CN216531044U - Linear motor

Info

Publication number: CN216531044U
Application number: CN202122508449.7U
Authority: CN
Inventors: 许俊坚; 罗荻洲; 许双甲
Original assignee: Shenzhen Dh Robotics Technology Co ltd
Current assignee: Shenzhen Dh Robotics Technology Co ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2022-05-13
Anticipated expiration: 2031-10-18

Abstract

The utility model relates to the technical field of motor equipment, in particular to a linear motor. The linear motor provided by the utility model comprises a base, a sliding block, a linear guide rail, a coil assembly, an iron core and a magnet yoke assembly; the sliding block, the coil assembly and the iron core are all fixed on the base; linear guide and magnet yoke subassembly fixed connection, slider and linear guide sliding fit, magnet yoke subassembly and the relative setting of coil pack. When the linear motor provided by the utility model works, the motion structure cannot be tilted, and the parallelism is better.

Description

Linear motor

Technical Field

The utility model relates to the technical field of motor equipment, in particular to a linear motor.

Background

The linear motor generally has base, linear rail, slider, coil pack and magnet, and in current linear motor, linear rail and magnet are fixed in the base, slider and linear rail sliding fit, and coil pack and slider fixed connection, during operation, the slider moves along linear rail along with the coil pack, realizes linear motion.

However, in the moving process of the conventional linear motor, a cable connected with the coil assembly is repeatedly pulled along with the movement of the coil assembly, and the cable is easily damaged, so that the durability and reliability of the linear motor are poor; in addition, the slider generally is two at least, and in linear electric motor motion process, because the arm of force is different, the power that leads to two sliders to receive is different, and the motion structure can perk easily, leads to linear electric motor's depth of parallelism relatively poor.

In summary, how to overcome the above-mentioned defects of the existing linear motor is a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a linear motor to solve the technical problems of poor durability, reliability and parallelism of the linear motor in the prior art.

The utility model provides a linear motor which comprises a base, a sliding block, a linear guide rail, a coil assembly, an iron core and a magnet yoke assembly.

The sliding block, the coil assembly and the iron core are all fixed on the base; the linear guide rail is fixedly connected with the magnet magnetic yoke assembly, the sliding block is in sliding fit with the linear guide rail, and the magnet magnetic yoke assembly and the coil assembly are arranged oppositely.

Preferably, as an embodiment, the linear motor further includes a mover frame, and the linear guide and the magnet yoke assembly are mounted to the mover frame.

Preferably, as an implementation manner, a stop piece is fixedly arranged on the mover frame, a clearance groove is arranged on the base, the stop piece is matched with the clearance groove, and a groove wall of the clearance groove is used for blocking the stop piece when the mover frame moves to the limit position.

Preferably, as an implementation manner, the base has a base body and an end cover, the end cover is fixedly connected with the base body, the end cover is in a groove-shaped structure, and the coil assembly and the iron core are both installed in a groove of the end cover.

Preferably, as an embodiment, the circuit board of the linear motor is mounted in a groove of the end cap.

Preferably, as an implementation mode, a groove wall of the end cover is provided with a notch, and the circuit board can extend out of the notch.

The bottom of the end cover protrudes out of the groove wall, a limiting convex block is arranged at the position, outside the groove, of the bottom of the end cover, and the two sides of the notch and the limiting convex block are used for limiting the circuit board.

Preferably, as an implementation manner, a portion of the base body located between the two sliders is provided with a groove for accommodating a magnetic encoder of the linear motor.

Preferably, as an implementation mode, one end of the base body is provided with a wiring groove, a partition board is arranged in the wiring groove, and the partition board is used for separating a wire connected with the magnetic encoder from a coil power supply wire.

Compared with the prior art, the utility model has the beneficial effects that:

when the linear motor provided by the utility model works, the magnet yoke assembly moves, and the coil assembly does not move, so that a cable connected with the coil assembly cannot be repeatedly pulled, the cable is not easy to damage, and the durability and reliability of the linear motor can be improved; but also can reduce the requirements on the cable, thereby reducing the cost.

In addition, when the linear motor works, the sliding block is fixed along with the coil assembly, the linear guide rail moves along with the magnet magnetic yoke assembly, attraction force generated between the coil assembly and the magnet magnetic yoke assembly acts between the linear guide rail and the sliding block, on the basis of the structure, the pressure applied to the sliding block from the linear guide rail is kept stable, and meanwhile, all parts of the linear guide rail in the whole moving process are stressed stably, so that the problem of tilting of the moving structure cannot occur, and the parallelism of the linear motor is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic perspective view of a linear motor according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a linear motor according to another embodiment of the present invention;

fig. 3 is a sectional view of a linear motor according to an embodiment of the present invention;

fig. 4 is an exploded view of a linear motor according to an embodiment of the present invention;

fig. 5 is a schematic view of an assembly structure of an end cover and a circuit board in a linear motor according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of an end cover in a linear motor according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of a base in a linear motor according to an embodiment of the present invention;

fig. 8 is a schematic view of an assembly structure of a base and a slider in a linear motor according to an embodiment of the present invention.

Description of reference numerals:

100-a base body; 110-avoiding groove; 120-grooves; 130-a wiring trough; 140-a separator;

200-end cap; 210-a gap; 220-a limit bump;

300-a slide block;

400-linear guide rail;

500-a coil assembly;

600-an iron core;

700-a magnet yoke assembly;

800-a mover frame; 810-a stop;

900-a circuit board;

1000-magnetic encoder.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Referring to fig. 1 to 3, the present embodiment provides a linear motor including a base, a slider 300, a linear guide 400, a coil assembly 500, a core 600, and a magnet yoke assembly 700; the slider 300, the coil assembly 500 and the core 600 are fixed to the base; the linear guide 400 is fixedly connected with the magnet yoke assembly 700, the slider 300 is in sliding fit with the linear guide 400, and the magnet yoke assembly 700 is arranged opposite to the coil assembly 500.

When the linear motor provided by the embodiment works, the magnet yoke assembly 700 moves, and the coil assembly 500 does not move, so that a cable connected with the coil assembly 500 cannot be repeatedly pulled, the cable is not easy to damage, and the durability and reliability of the linear motor can be improved; but also can reduce the requirements on the cable, thereby reducing the cost.

In addition, when the linear motor works, the slider 300 is fixed with the coil assembly 500, the linear guide 400 moves with the magnet yoke assembly 700, and the attractive force generated between the coil assembly 500 and the magnet yoke assembly 700 acts between the linear guide 400 and the slider 300, so that on the basis of the above structure, the pressure applied to the slider 300 from the linear guide 400 is kept stable, and meanwhile, the stress of each part of the whole moving process of the linear guide 400 is stable, therefore, the tilting problem of the moving structure cannot occur, and therefore, the parallelism of the linear motor provided by the embodiment is better.

The linear motor provided in the present embodiment is preferably a short stroke linear motor in which the weight of the moving structure is similar to that of the moving coil type linear motor, and thus, the same performance as that of the moving coil type linear motor can be obtained.

Referring to fig. 2 to 4, in the specific structure of the linear motor provided in this embodiment, a mover frame 800 is further provided, and the linear guide 400 and the magnet yoke assembly 700 are both mounted on the mover frame 800, so that the linear guide 400 and the magnet yoke assembly 700 are supported by the mover frame 800, and the linear guide 400 and the magnet yoke assembly 700 are indirectly fixed, so that the motion structure assembled by the mover frame 800, the linear guide 400 and the magnet yoke assembly 700 is convenient to obtain higher structural strength and is convenient to assemble.

Further, referring to fig. 4, a stopper 810 may be fixedly disposed on the mover frame 800, correspondingly, a clearance groove 110 is disposed on the base, the stopper 810 on the mover frame 800 is matched with the clearance groove 110 on the base, the stopper 810 can move along the clearance groove 110 during the movement of the mover frame 800, when the mover frame 800 moves to a limit position, a groove wall of the clearance groove 110 blocks the stopper 810, so that the stopper 810 cannot move forward any more, and further, the mover frame 800 cannot move forward any more, thereby limiting the movement structure and preventing the movement structure from separating from the base.

Referring to fig. 3 to 6, in the specific structure of the base, the base body 100 and the end cap 200 may be provided, the end cap 200 is fixedly connected to the base body 100, the end cap 200 is provided in a groove-shaped structure, and the coil assembly 500 and the core 600 are both mounted in the groove of the end cap 200, so that the groove wall of the end cap 200 can surround the coil assembly 500 and the core 600, and thus the groove wall of the end cap 200 can limit the coil assembly 500 and the core 600 and protect the coil assembly 500 and the core 600, and the structural reliability is stronger.

Further, the circuit board 900 of the linear motor may be installed in the groove of the end cap 200, thereby facilitating the integration of the coil assembly 500, the iron core 600, the circuit board 900 and the end cap 200, and improving the mass-producibility; in addition, the groove wall of the end cover 200 can limit the circuit board 900 and protect the circuit board 900, so that the reliable work of the linear motor is ensured.

Specifically, referring to fig. 5 and 6, a notch 210 may be formed in a wall of the end cap 200, so that the circuit board 900 can extend from the notch 210; the bottom of the end cap 200 is arranged to protrude from the wall of the groove, and the position of the bottom of the end cap 200, which is located outside the groove, is provided with the limiting protrusion 220, so that the two sides of the notch 210 and the limiting protrusion 220 can serve as three limiting points to limit the circuit board 900.

Preferably, two sides of the notch 210 are arranged in a staggered manner to improve the limiting effect on the circuit board 900.

Referring to fig. 4 and 8, the slider 300 of the present embodiment is fixed on the base, a region exists between the two sliders 300, and a groove 120 for accommodating a magnetic encoder 1000 of the linear motor is formed at a position between the two sliders 300 of the base, so that the thickness occupied by the base can be fully utilized to reduce the overall thickness of the linear motor.

Specifically, referring to fig. 4 and 7, a wiring groove 130 may be provided at one end of the base, and a wire connected to the magnetic encoder 1000 and a coil supply wire may be inserted into the groove of the end cap 200 through the wiring groove 130 to be connected to a corresponding structure (the magnetic encoder 1000 or the circuit board 900 connected to the coil assembly 500).

Preferably, a spacer 140 may be disposed within the cabling channel 130, with the spacer 140 separating the wire connecting the magnetic encoder 1000 from the coil supply wire.

It should be noted that the voltage in the line connecting the magnetic encoder 1000 is a low voltage, generally 5V; the voltage in the coil supply line is high, typically 24V or 48V, and thus, a spacer is provided between the two to separate the line connecting the magnetic encoder 1000 from the coil supply line, preventing interference caused by twisting the low voltage line and the high voltage line, and providing high reliability.

Specifically, the partition plate 140 may be disposed parallel to the thickness direction of the linear motor, and thus, it is advantageous to improve structural strength.

In particular, the fixing of the slider 300 to the base can be realized by means of a threaded connection or gluing, preferably a threaded connection, with greater reliability.

Specifically, a plurality of first threaded holes are formed in the slider 300, a plurality of first through holes are formed in the base, and a first screw is screwed into the first threaded hole in the slider 300 through the first through hole in the base, so that the slider 300 is fixed to the base. Of course, the solution of changing the orientation of the first screw is also within the scope of the present invention.

Accordingly, the linear guide 400 and the mover frame 800 may be fixed by a threaded connection or an adhesive, preferably, the threaded connection is achieved, and the reliability is high.

Specifically, a plurality of second through holes are formed in the linear guide 400, a plurality of second threaded holes are formed in the mover frame 800, and second screws are used to penetrate through the second through holes in the linear guide 400 and be screwed into the second threaded holes in the mover frame 800, so that the linear guide 400 and the mover frame 800 are fixed. Of course, the solution of changing the orientation of the second screw is also within the scope of the present invention.

In addition, a plurality of third through holes may be formed in the stopper 810, a plurality of third threaded holes may be formed in the mover frame 800, and a third screw may be screwed into the third threaded hole of the mover frame 800 through the third through hole of the stopper 810, so as to fix the stopper 810 and the mover frame 800.

In summary, the embodiments of the present invention disclose a linear motor, which overcomes many technical defects of the conventional linear motor. When the linear motor provided by the embodiment of the utility model works, the magnet yoke assembly 700 moves, the coil assembly 500 does not move, the cable is not easy to damage, and the durability and the reliability are higher; in addition, each part of the linear guide rail 400 in the whole moving process is stressed stably, the tilting problem cannot occur, and the parallelism is better.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A linear motor is characterized by comprising a base, a sliding block (300), a linear guide rail (400), a coil assembly (500), an iron core (600) and a magnet yoke assembly (700);

the slider (300), the coil assembly (500) and the iron core (600) are all fixed to the base; the linear guide rail (400) is fixedly connected with the magnet magnetic yoke assembly (700), the sliding block (300) is in sliding fit with the linear guide rail (400), and the magnet magnetic yoke assembly (700) is opposite to the coil assembly (500).

2. The linear motor according to claim 1, further comprising a mover frame (800), wherein the linear guide (400) and the magnet yoke assembly (700) are mounted to the mover frame (800).

3. The linear motor according to claim 2, wherein a stop member (810) is fixedly disposed on the mover frame (800), a clearance groove (110) is disposed on the base, the stop member (810) is engaged with the clearance groove (110), and a groove wall of the clearance groove (110) is used for blocking the stop member (810) when the mover frame (800) moves to an extreme position.

4. A linear motor according to any one of claims 1 to 3, the base having a base body (100) and an end cap (200), the end cap (200) being fixedly connected to the base body (100), the end cap (200) having a channel-like configuration, the coil block (500) and the core (600) being mounted in the channel of the end cap (200).

5. A linear motor according to claim 4, characterized in that the circuit board (900) of the linear motor is mounted in a slot of the end cap (200).

6. The linear motor according to claim 5, wherein a notch (210) is formed in a groove wall of the end cover (200), and the circuit board (900) can extend out of the notch (210);

the bottom of the end cover (200) protrudes out of the groove wall, a limiting bump (220) is arranged at the position, located outside the groove, of the bottom of the end cover (200), and the two sides of the notch (210) and the limiting bump (220) are used for limiting the circuit board (900).

7. A linear motor according to any one of claims 1 to 3, wherein a recess (120) for receiving a magnetic encoder (1000) of the linear motor is formed in a portion of the base located between the two sliders (300).

8. A linear motor according to claim 7, characterized in that one end of the base is provided with a cabling channel (130), a spacer (140) being provided in the cabling channel (130), the spacer (140) being used to separate the wire connecting the magnetic encoder (1000) from the coil supply wire.