KR102561189B1 - Waterproof step motor using magnetic field repulsion between rotating magnets - Google Patents

Abstract

The present invention relates to a waterproof stepper motor using repulsive force of a magnetic field between rotating magnets, comprising: a case 100 having an upwardly opened interior; A cover 200 installed to be openable and open on the upper surface of the case 100; A gasket 300 interposed between the case 100 and the cover 200 to seal; A rotor unit 400 rotatably arranged in the case 100; It is installed inside the case 100 to cover the outer circumferential surface of the rotor unit 400 while forming a certain interval with the rotor unit 400 to drive the rotor unit 400 by electromagnetic force, and is radially arranged on the upper and lower surfaces. It is characterized in that it includes; fixed cores 500 to which the coils 510 are respectively exposed.
In the present invention, as the upper, middle, and lower magnets are installed so that the same polarities face each other, strong repulsive force acts, and as a result, the magnetic flux density (shortened to 'magnetic flux density') representing the size of the magnetic field increases, causing rotation. Since torque can be increased, there is an advantage in maximizing output efficiency compared to the prior art.

Description

Waterproof step motor using magnetic field repulsion between rotating magnets}

The present invention relates to a waterproof stepper motor using repulsive force between magnetic fields between rotating magnets, and more particularly, since it is possible to increase rotational torque by increasing magnetic flux density without changing the size of an existing motor, rotation that can maximize output efficiency It relates to a waterproof stepper motor using magnetic field repulsion between magnets.

In general, a stepping motor (stepping motor) rotates at a fixed angle without feedback for detecting the position of the shaft, can stop with significantly high accuracy, and has a very large stopping torque when stopped compared to other motors. It does not require a position-holding mechanism such as an electronic brake, and the rotational speed is proportional to the pulse, so it has driving characteristics that can be easily controlled.

Due to these characteristics, the stepping motor is mainly used for precisely controlling the amount of mechanical movement in order to transfer a device or article to a desired position by rotating as much as the number of input pulses. Since it is possible to control by , it is widely used as a driving source for small precision electronic devices.

In addition, it is applied to semiconductor manufacturing facilities and installed in facilities requiring precise position control, such as a wafer alignment device and a transfer arm position control device, to perform the process.

On the other hand, the rotor of a conventional stepping motor (stepper motor) consists of one assembly in which rotation cores are installed on the upper and lower surfaces of flat magnets, respectively. When simply increasing these assemblies to improve torque performance, the size of the motor itself There was a relatively large problem, so there was a big difficulty in improving performance.

Therefore, in recent years, research on stepping motors having various functions capable of maximizing output efficiency by greatly improving torque performance while maintaining the size of an existing motor has been actively conducted.

1. Republic of Korea Patent No. 10-0245483 (2000.05.15)

An object of the present invention is to provide a waterproof stepper motor using repulsive force between magnetic fields between rotating magnets, which can maximize output efficiency because rotational torque can be increased by increasing magnetic flux density without changing the size of an existing motor.

Another object of the present invention is to provide a waterproof stepper motor using repulsive force between magnetic fields between rotating magnets that can be used underwater by enhancing the waterproof function.

The present invention for achieving the above object,

a case whose interior is open upward;

a cover installed to be openable and openable on an upper surface of the case;

A gasket interposed between the case and the cover to seal;

A rotor unit that is rotatably chukseol to the case;

A fixed core installed inside the case to cover the outer circumferential surface of the rotor unit at regular intervals with the rotor unit to drive the rotor unit by electromagnetic force, and having coils arranged radially on the upper and lower surfaces exposed, respectively. to be characterized

Here, the rotor unit,

A rotating shaft rotatably installed in the case so that the upper end passes through the cover;

Upper, middle, and lower magnets that are inserted into the rotating shaft so that the same polarity faces each other and rotate together with the rotating shaft;

Upper and lower rotating cores made of magnetic material having a diaphragm partitioning the inner space up and down and being inserted into the rotating shaft intervened between the upper, middle and lower magnets to surround the upper, middle and lower magnets;

It is characterized by being composed of a snap ring that is detachably coupled to both ends of the rotating shaft to prevent the magnet and the core from leaving.

In addition, between the upper and lower magnets of the rotor unit and the snap ring, a magnetic shield plate for blocking magnetic field emission to the outside of the case is further reinforced.

In addition, a separating plate made of rubber is further reinforced between the upper and lower magnets of the rotor unit and the magnetic shield plate.

Also, in the present invention,

In the center of the cover, a bushing housing protruding upward, an injection port spaced apart from the bushing housing and communicating with the inside of the case, and a stopper capable of opening and closing the injection port are further reinforced;

A bushing having an O-ring and supporting and sealing a rotating shaft that is detachably installed in the bushing housing and inserted into the bushing housing;

A lubricant injected into the case through the injection port to fill the space between the case and the cover; characterized in that it further comprises.

Also, in the present invention,

It is characterized in that the outer circumferential surface of the upper and lower rotating cores and the inner circumferential surface of the fixed core are further provided with concave-convex portions.

In the present invention, as the upper, middle, and lower magnets are installed so that the same polarities face each other, strong repulsive force acts, and as a result, the magnetic flux density (shortened to 'magnetic flux density') representing the size of the magnetic field increases, causing rotation. Since torque can be increased, there is an advantage in maximizing output efficiency compared to the prior art.

In addition, when the upper, middle and lower magnets are accommodated inside the upper and lower rotating cores in a state where the upper, middle and lower magnets are arranged so that the same polarity faces each other, while maintaining the same size as the conventional rotor unit, the conventional rotor unit It has the advantage of being able to manufacture a high-efficiency stepper motor.

In addition, by injecting the lubricant into the case, it is adsorbed on the surface of the rotor unit and the fixed core, thereby reducing the load so that the operation between the rotor unit and the fixed core can occur smoothly, and preventing rust from occurring. In addition, it fills up the surplus space between the case and the cover to prevent penetration of water from outside.

1 is a perspective view of a combined waterproof stepper motor using magnetic repulsive force between rotating magnets according to the present invention.
Figure 2 is an exploded perspective view of a waterproof step motor using magnetic field repulsion between rotating magnets according to the present invention.
Figure 3 is a combined cross-sectional view of a waterproof step motor using magnetic field repulsive force between rotating magnets according to the present invention.
Figure 4 is a plan view in a state in which the cover is removed from the waterproof step motor using the magnetic field repulsive force between the rotating magnets according to the present invention.
5 is an exploded perspective view showing a rotor unit separately extracted from a waterproof stepper motor using magnetic field repulsive force between rotor magnets according to the present invention.
Figure 6 is a cross-sectional view showing a coupled rotor unit separately extracted from the waterproof step motor using the magnetic field repulsive force between the rotor magnets according to the present invention.
7 is a view for explaining the operation of the waterproof step motor using the repulsive magnetic field between the rotating magnets according to the present invention.
8 is a view showing a conventional rotor unit and a rotor unit of the present invention.

Hereinafter, it will be described in more detail based on the accompanying drawings.

1 is a combined perspective view of a waterproof step motor using magnetic field repulsive force between rotating magnets according to the present invention, Figure 2 is an exploded perspective view of a waterproof step motor using magnetic field repulsive force between rotating magnets according to the present invention, and FIG. Figure 4 is a plan view of the waterproof step motor using the magnetic repulsive force between the rotating magnets according to the present invention in a state where the cover is removed, Figure 5 is a plan view according to the present invention An exploded perspective view of a rotor unit separately extracted from a waterproof stepper motor using repulsive force between magnetic fields between rotating magnets. 7 is a cross-sectional view, and FIG. 7 is a view for explaining the operation of a waterproof stepper motor using repulsive force between magnetic fields between rotating magnets according to the present invention.

1 to 3, a waterproof step motor according to an embodiment is composed of a case 100, a cover 200, a gasket 300, a rotor unit 400, and a fixed core 500, According to this, since it is possible to increase the rotational torque by increasing the magnetic flux density without changing the size of the existing motor, there is a technical feature that can maximize the output efficiency.

In addition, there is a technical feature that can be used underwater by reinforcing the bushing 600 and the lubricant O in the above configuration to enhance the waterproof function.

The case 100 is made of a (cylindrical) cylindrical shape with an upwardly opened interior using a synthetic resin or metal material.

A bearing accommodating portion 111 protruding downward is integrally formed at the center of the lower surface of the case 100, and a bearing B is fitted into the bearing accommodating portion 111, and a rotor unit ( 400) is rotatably inserted into one end of the rotational shaft 410.

Also, on the upper surface of the case 100, fastening holes H1 to which screw bolts B1 are fastened are radially arranged.

The cover 200 is detachably installed on the upper surface of the case 100 via a screw bolt B1 and serves to close the upper surface of the case 100 .

A bushing housing 210 protruding upward is integrally formed at the center of the cover 200, and the center of the bushing housing 210 is vertically penetrated, so that the rotation shaft 410 constituting the rotor unit 400 is formed. The other end is fitted through, and the bushing 600 having an O-ring 610 is inserted and detachably fitted into the bushing housing 210 to support and seal the rotary shaft 410.

On the other hand, unless the stepper motor according to the present invention is disposed underwater, a ball bearing having the same structure as the inserted bearing B of the case 100 is installed in the bushing housing 210 instead of the bushing 600 to rotate the shaft 410 It may be supported rotatably.

In addition, the cover 200 is integrally formed with an injection hole 220 penetrating vertically at a position spaced apart from the bushing housing 210 by a predetermined distance, and the injection hole 220 communicates with the inside of the case 100. And, the stopper 230 is detachably fitted into the inlet 220.

For example, the stopper 230 may be a member of rubber material or a screw bolt, but in this embodiment, a screw bolt capable of withstanding external shock and internal pressure while maintaining a fastened state is applied. gave.

In addition, the cover 200 is integrally formed with a screw coupling hole H2 through which the screw bolt B1 is inserted at a position corresponding to the fastening hole H1 of the case 100, and the screw coupling hole ( The screw bolt B1 inserted through H2 is fastened to the fastening hole H1 of the case 100 to couple the case 100 and the cover 200 to each other.

The gasket 300 is a sealing member manufactured in a donut shape using a silicon material. It serves to block the outflow or the inflow of infiltrate from the outside.

The rotor unit 400 is composed of a rotating shaft 410, upper, middle and lower magnets 420A, 420B and 420C, upper and lower rotating cores 430A and 430B, and a snap ring 460, in the case of this embodiment. It is rotatably installed in the case 100 and rotated by the electromagnetic force of the fixed core 500.

The rotary shaft 410 is a round bar, and is rotatably installed in the case 100 so that the upper end passes through the cover 200. The upper end of the rotary shaft 410 is a bushing installed in the bushing housing 210 of the cover 200. It is supported by 600, and the lower end is rotatably inserted into and supported by bearing (B) installed in case 100.

In addition, a snap ring mounting portion 411 recessed in a ring shape is integrally formed on the outer circumferential surface of both ends of the rotating shaft 410, and a snap ring 460 is detachably coupled to the snap ring mounting portion 411 to rotate the shaft 410 Blocks the separation of the components inserted into the

The upper, middle, and lower magnets 420A, 420B, and 420C are either neodymium magnets or samarium magnets, and in this embodiment, the same polarities are inserted into the rotation shaft 410 so that they face each other and rotate together with the rotation shaft 410. .

The upper and lower rotating cores 430A and 430B are members of a magnetic material in which the internal space is divided up and down via a diaphragm 431, and in the present embodiment, between the upper, middle and lower magnets 420A, 420B and 420C. It serves to wrap the upper, middle, and lower magnets 420A, 420B, and 420C that are inserted into the rotating shaft 410 to be intervened and accommodated inside.

As an example, the upper end of the middle magnet 420B is inserted inward through the lower end of the upper rotary core 430A, and the lower end is inserted inward through the upper end of the lower rotary core 430B.

And the upper magnet (420A) is inserted inward through the upper end of the upper rotary core (430A) so that the upper surface is exposed upward, and the lower magnet (420C) is inserted inward through the lower end of the lower rotary core (430B) exposed downward.

The snap ring 460 is detachably installed on the snap ring mounting portion 411 of the rotation shaft 410 to prevent the upper, middle, and lower magnets 420A, 420B, and 420C from being separated from the rotation shaft 410 by repulsive force. do

Referring to FIGS. 6 and 7, as the upper, middle, and lower magnets 420A, 420B, and 420C are installed so that the same polarities face each other as described above, a strong repulsive force acts, and as a result, a line of magnetic force indicating the magnitude of the magnetic field. Since the rotational torque can be increased as the flux density (shortened to 'magnetic flux density') increases, there is an advantage in maximizing output efficiency compared to the prior art.

In addition, as in the conventional structure (see FIG. 1 of Korean Patent Registration Publication No. 10-0245483), simply increasing the number of flat magnets and rotor yokes fundamentally increases the size of the motor, but the same as in the present invention In a state where the upper, middle, and lower magnets 420A, 420B, and 420C are arranged so that their polarities face each other, the upper, middle, and lower magnets 420A, 420B, and 420C are placed inside the upper and lower rotating cores 430A and 430B. If accommodated, it is possible to manufacture a high-efficiency stepper motor without increasing the size of the motor.

Meanwhile, the rotor unit 400 may further include a magnetic shield plate 440 and a separator plate 450.

The magnetic shield plate 440 is inserted into the rotating shaft 410 so as to be installed between the upper and lower magnets 420A and 420C and the snap ring 460 to block the magnetic field from being emitted to the outside of the case 100.

The separation plate 450 is inserted into the rotating shaft 410 so as to be installed between the upper and lower magnets 420A and 420C and the magnetic shield plate 440, and is made of silicone or rubber.

The fixed core 500 is installed inside the case 100 so as to cover the outer circumferential surface of the rotor unit 400 while forming a certain distance from the rotor unit 400, and the rotor unit 400 is moved through the electromagnetic force caused by the current. serves as a driving force.

A radially wound coil 510 is arranged on the upper and lower surfaces of the fixed core 500 .

On the other hand, on the outer circumferential surface of the upper and lower rotating cores 430A and 430B and the inner circumferential surface of the fixed core 500, saw-toothed uneven portions 432 and 520 are provided, respectively.

As an example, when a driving pulse from a driving circuit is supplied to the coil 510 of the fixed core 500, the rotor unit 400 gradually rotates.

Since the above driving method is a widely known technique in the related field, a detailed description thereof will be omitted.

On the other hand, by further reinforcing the bushing 600 and the lubricant O in the previous embodiment, it is possible to manufacture a waterproof motor that can be used underwater.

The bushing 600 is a member manufactured in a tubular shape with an inside penetrating vertically using a plastic polymer. In the present embodiment, it is detachably accommodated in the bushing housing 210 of the cover 200 to support the rotating shaft 410 It plays a sealing role while doing it.

As shown in FIG. 3, an O-ring 610 is accommodated inside the bushing 600, and the O-ring 610 is compressed and deformed by the rotating shaft 410 penetrating the bushing 600, and the rotating shaft 410 ) serves to block the outflow of the lubricant O stored inside the case 100 or the inflow of permeating water from the outside.

The lubricant (O) is injected into the case 100 through the inlet 220 of the cover 200 and adsorbed to the surfaces of the rotor unit 400 and the fixed core 500, thereby increasing the rotor unit 400. It reduces the load so that the operation between the and the fixed core 500 can occur smoothly, prevents rust from occurring, and fills the surplus space between the case 100 and the cover 200 to inflow water from the outside It serves as a waterproof barrier.

(experimental example)

8 is a view showing a conventional rotor unit and a rotor unit of the present invention, which will be described with reference to this.

The magnets applied to the conventional rotor unit and the rotor unit of the present invention were the same.

The strength of the magnetic field formed on the outer circumferential surface of the conventional rotor unit (A) and the rotor unit (B) of the present invention using a JL magnet magnetometer (Gauss meter) capable of measuring from 1 to 10000 (Gauss) The strength of the magnetic field formed on the outer circumferential surface was measured, respectively.

magnet surface magnetic field number of magnets outer magnetic field conventional rotor unit 170G One 130-140G Rotor unit of the present invention 170G 3 220-230G

As shown in the table above, the strength of the magnetic field formed on the outer circumferential surface of the conventional rotor unit (A) was measured at 130 to 140 G, whereas the strength of the magnetic field formed on the outer circumferential surface of the rotor unit (B) of the present invention was 220 ~230 G was found to be measured.

This is because the upper, middle, and lower magnets 420A, 420B, and 420C are installed so that the same polarities face each other as in the present invention, so that strong repulsive force acts, and as a result, the magnetic flux density representing the size of the magnetic field (abbreviated as 'magnetic flux density') It was confirmed through experiments that the output efficiency can be maximized compared to the prior art because the rotational torque can be increased as the rotational torque is increased.

In addition, there is a fundamental problem that the size of the motor increases when the number of magnets and rotating cores is simply increased, but the upper, middle, and lower magnets 420A, 420B, and 420C are arranged so that the same polarities face each other as in the present invention. When the upper, middle, and lower magnets 420A, 420B, and 420C are accommodated inside the upper and lower rotating cores 430A and 430B in one state, while maintaining the same size as the conventional rotor unit, high efficiency compared to the conventional You can make stepper motors.

Although the present invention has been described in detail only for the specific embodiments described, it is natural for those skilled in the art that various changes and modifications can be made within the scope of the technical idea of the present invention, and it is natural that such changes and modifications fall within the scope of the appended claims.

100: case 111: bearing receiving portion 200: cover
210: bushing housing 220: inlet 230: stopper
300: gasket 400: rotor unit 410: rotating shaft
411: snap ring mounting part 420A, 420B, 420C: upper, middle, lower magnet
430A, 430B: upper and lower rotating core 431: diaphragm
440: magnetic shielding plate 450: separator plate 460: snap ring
500: fixed core 510: coil 600: bushing
610: O-ring B: bearing B1: screw bolt

Claims (6)

Case 100 with an interior opening upward;
A cover 200 installed to be openable and open on the upper surface of the case 100;
A gasket 300 interposed between the case 100 and the cover 200 to seal;
The rotational shaft 410 rotatably installed in the case 100 so that the upper end penetrates the cover 200, and the upper, middle, and upper parts are inserted into the rotational shaft 410 so that the same polarities face each other and rotate together with the rotational shaft 410. It is equipped with lower magnets 420A, 420B, and 420C and a diaphragm 431 that partitions the inner space up and down, and is inserted into the rotating shaft 410 so as to be interposed between the upper, middle, and lower magnets 420A, 420B, and 420C, respectively. The upper and lower rotating cores (430A, 430B) made of magnetic material surrounding the middle and lower magnets (420A, 420B and 420C) are detachably coupled to both ends of the rotating shaft 410, and the upper, middle and lower magnets (420A, 420B) 420B, 420C) and a rotor unit 400 composed of a snap ring 460 preventing separation of the upper and lower rotating cores 430A and 430B;
It is installed inside the case 100 to cover the outer circumferential surface of the rotor unit 400 while forming a certain interval with the rotor unit 400 to drive the rotor unit 400 by electromagnetic force, and is radially arranged on the upper and lower surfaces. Fixed cores 500 to which coils 510 are respectively exposed;
In the center of the cover 200, a bushing housing 210 protrudes upward, an injection hole 220 spaced apart from the bushing housing 210 and communicating with the inside of the case 100, and an injection hole 220 that can be opened and closed. The stopper 230 is further reinforced;
A bushing 600 having an O-ring 610 and supporting and sealing the rotating shaft 410 inserted and detachably installed in the bushing housing 210;
Consisting of a lubricant (O) injected into the case 100 through the injection port 220 to fill the space between the case 100 and the cover 200; waterproofing step using magnetic field repulsive force between rotating magnets, characterized in that motor.
According to claim 1,
Between the upper and lower magnets 420A and 420C and the snap ring 460, a magnetic shield plate 440 is further reinforced to block the magnetic field from being emitted to the outside of the case 100. Magnetic field repulsive force between the rotating magnets, characterized in that Waterproof stepper motor using
According to claim 2,
A waterproof stepper motor using magnetic field repulsion between rotating magnets, characterized in that a rubber separating plate 450 is further reinforced between the upper and lower magnets 420A and 420C and the magnetic shield plate 440.
According to claim 1,
The outer circumferential surface of the upper and lower rotating cores 430A and 430B and the inner circumferential surface of the fixed core 500 are further provided with concave-convex portions 432 and 520; Waterproof step motor using magnetic field repulsion between rotating magnets, characterized in that. delete delete

Images