KR102310927B1 - Waterproof step motor by utilizing the pushing force of the magnetic field between rotating magnetic - Google Patents

Abstract

The present invention relates to a hybrid step motor among brushless synchronous step motors that convert digital pulses into mechanical shaft rotation. In an existing hybrid step motor, one rotating magnet is inserted into a rotating shaft in a rotation axis direction and a core having toothed magnetic pole pieces on an outer peripheral surface is installed at upper and lower portions, so magnetic force lines are less emitted toward the outer peripheral surface, thus lowering efficiency and causing stepping-out. In a waterproof step motor using magnetic field repulsion between rotating magnets according to the present invention, three rotating magnets are installed in the rotating shaft with the same poles thereof facing each other, such that the magnetic force lines are emitted more toward the outer peripheral surface of the rotating core to increase a magnetic flux density, thereby increasing efficiency and preventing stepping-out. In addition, the waterproof step motor can be used in water because an O-ring is inserted into an inside diameter side of a plastic polymer bushing and pressed against the rotating shaft to be tightly in contact with the rotating shaft. Moreover, after inserting parts into the motor, empty spaces are filled with magnetic lubricant grease to prevent water from entering due to water pressure even in deep water.

Description

A waterproof step motor using a magnetic field repulsion between rotating magnets {Waterproof step motor by utilizing the pushing force of the magnetic field between rotating magnetic}

The present invention forms a plurality of toothed pole pieces on the excitation pole of a stator, a permanent magnet is mounted on a rotating shaft in the axial direction as a rotor, and a toothed pole piece is formed on the outer circumferential surface of the core to convert a fixed coil through which current flows This is a technical field related to a hybrid waterproof stepper motor in which the rotor rotates at a certain angle whenever it is rotated.

The system maintenance and management cost is low, the feedback control is unnecessary, the digital generator has high torque even when it is rotated at high speed, so there is no step-out phenomenon. The unipolar stepper, which is driven by always flowing in one direction, is relatively simple, but the motor efficiency is low and the torque is weak when driven at low speed. During rotation, the torque is rapidly lowered, causing a step-out phenomenon, and the circuit is complicated.

The present invention relates to a hybrid unipolar stepper motor and a hybrid bipolar stepper motor according to the above winding method as a background art.

(KR) Patent Registration No. 1499165

The waterproof step motor using the magnetic field repulsion between rotating magnets according to the present invention increases the rotational torque by increasing the magnetic flux density of the rotating magnet, so that the unipolar stepper motor has low efficiency and the torque is weak when rotating at low speed. It is intended to solve the disadvantage of stepping out due to weak torque during rotation, and to solve the problem of making it waterproof so that it can be used underwater.

The present invention uses three rotating magnets and is configured in the direction of the axis of rotation, with the same poles as the magnetic poles of the magnets formed in the middle face each other so that the repulsive force is applied with the upper and lower two ferrite powder core cores or Alnico cores interposed therebetween. It is a means to solve the shortcomings of unipolar and bipolar stepper motors by increasing the magnetic flux density of the rotating magnet and increasing the rotational torque. The solution to the problem is to drain the electric wire to the outside and fill the empty space inside with lubricating grease after assembly to prevent moisture from entering the motor due to water pressure even when used in deep water.

When the step motor according to the present invention is mounted on a precision electronic device, the magnetic flux density of the rotor is increased compared to a general hybrid-type step motor, thereby reducing efficiency and torque when driving at low speed or high speed, and preventing a step-out phenomenon caused by a decrease in magnetic flux density. There is no malfunction caused by this, and there is an effect that water does not enter even in water.

1 is an exemplary side cross-sectional view of a waterproof stepper motor according to the present invention;
2 is a flat cross-sectional view of a waterproof step motor according to the present invention;
3 is a side cross-sectional view showing the magnet configuration of the waterproof step motor according to the present invention and the rotating magnet of the conventional hybrid type step motor;
4 is a schematic diagram showing magnetic force lines due to repulsive force between rotating magnets used in a waterproof step motor according to the present invention;
5 is a plan view and a side cross-sectional view illustrating the configuration of a waterproof plastic polymer bushing and an O-ring of a waterproof step motor according to the present invention;
6 is a side view of a rotor of a waterproof step motor according to the present invention and a conventional step motor rotor and a comparison test result table.

The detailed description for solving the problem according to the present invention with the accompanying drawings in detail as follows. However, the accompanying drawings may be exaggerated, omitted, or schematically shown for the convenience of explanation regarding the main parts, and terms and names used in the description are impliedly defined by the shape, action, role, etc. of the configuration rather than the dictionary meaning. It can be done, and the description of the direction is determined based on the first presented direction from the first presented drawing, and the description of the position is determined based on the center of each component or the center of the circle. In addition, detailed descriptions of pre-registered known technologies and conventional technologies may obscure the gist and are omitted or replaced with simple symbols or names.

In addition, the specific structure, shape, shape, arrangement, size, etc. of the configuration that can be identified through the drawings, the operation of the configuration that can be inferred through the drawings, and the effect thereof may also obscure the subject, so detailed description will be omitted. Also, bolts, welding parts, holes, etc. applied for coupling between components may obscure the gist and may be omitted from the drawings.

The configuration and operation of the waterproof stepper motor using the magnetic field repulsion between rotating magnets according to the present invention will be described with reference to the accompanying drawings.

First, the configuration of the waterproof step motor of the present invention will be described with reference to FIG. 1 as follows.

In the case 10 made of plastic or metal, the lower bearing housing 11 is configured to mount the bearing 12, and the waterproof connector 14 is mounted in the connector hole 13 to drain the electric wire 15 to the outside. to be able to do it,

A fixing screw hole 21 is formed in the cover 20 made of plastic or metal so that it can be fastened with a fixing screw 22, and a polymer bushing housing 23 is formed to make a plastic polymer, and the inner diameter is The O-ring groove 25 is formed to partially protrude the O-ring 26 to the outside, and the waterproof polymer bushing 24 mounted so that the O-ring protrusion 27 is visible is mounted, assembled to cover the cover 20, and a set screw After fastening with (22), the grease inlet 28 is formed so that the empty space between the components configured and mounted inside the motor can be filled with the lubricant grease 60, and the inlet screw 29 is manufactured,

An intermediate magnet 31A selected from one of neodium or samarium magnets is mounted on the rotating shaft 30 made of metal in the middle of the longitudinal direction, and then a ferrite powder core or aluminum, nickel and cobalt alloys are used on the upper surface. The upper rotating core 32A manufactured by selecting one of the Alnico alloys and forming the toothed magnetic pole piece 33 on the outer circumferential surface is made of the same material on the lower surface to form the toothed magnetic pole piece 33. The core 32B is mounted, and the upper magnet 31B is mounted on the upper rotating core 32A with the same pole of the part facing the intermediate magnet 31A to generate a repulsive force, and then the rubber material is separated. After inserting the plate 34, a magnetic shielding iron plate 35 is inserted thereon to prevent magnetic poles from being released to the outside of the motor, and a snap ring 36 that serves to prevent the magnetic separation from being removed from the rotating shaft 30 by repulsive force. then plug it in.

The fixed core 40 manufactured by selecting one of a ferrite powder core having a high degree of freedom in shape or an alnico alloy alloyed with aluminum, nickel and cobalt has 50 teeth formed on the outer peripheral surface of the rotating cores 32A and 32B. The inner diameter side facing the pole piece 33 is cut into 8 equal parts to form six fixed core serrated pole pieces 41 on the inner circumferential surface, respectively, and then the coil 42 is wound to form an electromagnetic field by electric current. do.

When the case 10 and the cover 20 are combined, the gasket 50 used as a waterproof sealant is made of silicon.

The lubricant grease 60 uses a magnetic lubricant to facilitate the transfer of magnetic force between the toothed magnetic pole plates, and the lubricating component does not go down even when the operation of the motor is stopped. It is adsorbed to make it possible to operate the motor at a temperature of -50°C to +300°C, as well as lubricating and waterproofing functions.

In the method of assembling the partial parts of the waterproof step motor according to the present invention as described above, first, the fixed core 40 is inserted into the case 10 , and the rotating shaft 30 to which the parts are combined in accordance with the bearing 12 . After inserting the electric wire 15 with the waterproof connector 14, put the gasket 50 on the fixing core 40, cover the cover 20, and fasten it with the fixing screw 22, After the lubricant grease (60) is injected into the grease inlet (28), it is closed with the inlet screw (29) to complete it.

The waterproof stepper motor of the present invention manufactured by the above method emits the rotor magnetic force line 37 as shown in the attached figure 4 to smoothly transfer the magnetic field to the outer peripheral saw-tooth-shaped magnetic pole plate to obtain an accurate value. As a result of the comparative experiment as shown in Fig. 6, the existing Nema 17 stepper motor used one rotating magnet and the magnetic field strength emitted from the outer peripheral surface of the rotating core was 130~140 Gauss from each of the upper and lower cores, The strength of the magnetic field emitted from the outer peripheral surface of the rotating core of the same size as the existing Nema 17 rotating core manufactured for the experiment by the method of the present invention in which the magnetic field is strongly emitted in the radial direction by the repulsive force between the rotating magnets is the upper core and the lower core, respectively. Since it emits 220 to 230 Gauss, the waterproof step motor of the present invention generates a large torque due to an increase in magnetic flux density with the fixed core, so it can be used as an efficient motor, and as shown in FIG. When the protruding portion 27 of the O-ring 26 mounted on the inner diameter portion of the polymer bushing 24 inserts the rotating shaft 30, the O-ring 26 is pressed into close contact with the rotating shaft 30 to increase the waterproofing power, To use as a general step motor, a waterproof step motor using a magnetic field repulsion between rotating magnets is provided, characterized in that a waterproof polymer bushing can be replaced with a ball bearing.

10: case 11: bearing housing
12: bearing 13: connector hole
14: waterproof connector 15: electric wire
16: fixing screw groove 20: cover
21: fixing screw hole 22: fixing screw
23: polymer bushing housing 24: polymer bushing
25: O-ring groove 26: O-ring
27: O-ring protrusion 28: grease inlet
29: injection screw 30: rotation shaft
31A: middle magnet 31B: upper magnet
31C: lower magnet 32A: upper rotating core
32B: lower rotating core 33: toothed pole piece
34: separation plate 35: iron plate for magnetic shielding
36: snap ring 37: rotor magnetic force line
40: fixed core 41: fixed core serrated pole piece
42: coil 50: gasket
60: lubricant grease

Claims (7)

motor case (10);
a cover 20 for covering the motor case;
The rotating shaft 30 is inserted into the motor case;
a fixed core 40 inserted into the motor case;
A gasket (50) inserted into the motor case and
Including the lubricant grease 60 injected into the motor case,
The rotation shaft 30 is an intermediate magnet (31A), an upper magnet (31B), and a lower magnet (31C) used by selecting one of a neodium magnet or a samarium magnet. Next, an upper rotating core (32A) manufactured by protruding 50 toothed pole pieces (33) on the outer peripheral surface by selecting one of a ferrite powder core and an Alnico alloy, which is an aluminum, nickel, cobalt alloy, on the upper and lower surfaces. and the lower rotating core 32B, the upper magnet 31B is mounted on the upper rotating core 32A so that the magnetic poles of the surface facing the intermediate magnet 31A are repulsive between the same poles, and the separation plate After inserting (34), insert the magnetic shielding iron plate (35) to prevent the magnetic field from being emitted to the outside of the motor, and insert the snap ring (36) to prevent the upper magnet (31B) from being separated from the rotating shaft (30) by the repulsive force between the magnets. After fixing it so that the same poles face each other on the lower rotating core 32B, the lower magnet 31C is mounted, and the separation plate 34, the magnetic shielding iron plate 35, and the snap ring 36 are inserted. A waterproof stepper motor using magnetic field repulsion between rotating magnets. According to claim 1,
The motor case 10 is manufactured by selecting one of plastic or metal, and the lower bearing housing 11 is formed to mount the bearing 12, and the connector hole 13 is formed to mount the waterproof connector 14. A waterproof step motor using a magnetic field repulsion between rotating magnets, characterized in that the electric wire (15) can flow out and a fixing screw groove (16) is formed.
According to claim 1,
The cover 20 is manufactured by selecting one of plastic or metal, a fixing screw hole 21 is formed so that it can be fastened with a fixing screw 22 when fastening, and an O-ring groove is formed on the inner diameter side of the polymer bushing 24 (25) is formed so that a part of the O-ring 26 is protruded, and the protruding part 27 is inserted so that the protruding part 27 is visible. ) waterproof step motor using magnetic field repulsion between rotating magnets, characterized in that it can be blocked.
delete According to claim 1,
The fixed core 40 is formed by selecting one of a ferrite powder core or an alnico alloy, which is an aluminum, nickel, and cobalt alloy, and dividing the inner diameter side into 8 equal parts, and protruding six fixed core toothed pole pieces 41 in each. A waterproof step motor using a magnetic field repulsion between rotating magnets, characterized in that the manufactured and wound coil (42).
According to claim 1,
The gasket 50 is a waterproof step motor using a magnetic field repulsion between rotating magnets, characterized in that it is made of silicon.
According to claim 1,
Lubricating grease 60 is a waterproof step motor using magnetic field repulsion between rotating magnets, characterized in that using a lubricant with magnetic properties.

Images