KR101509510B1 - Hollow type linear stepping motor - Google Patents

Abstract

A hollow linear stepping motor is disclosed. Since the hollow linear stepping motor is formed of hollow hollow bodies, the light emitted from the sensor passes through the interior of the motor. Therefore, it can be used without restriction on the place of use and installation place.

Description

[0001] HOLLOW TYPE LINEAR STEPPING MOTOR [0002]

1 is a perspective view of a hollow linear stepping motor according to an embodiment of the present invention;

2 is a cross-sectional view taken along the line "A-A"

3 is an exploded perspective view of the frame and the stator shown in Fig.

4 is an exploded perspective view of the frame and the rotor shown in Fig.

Description of the Related Art [0002]

110: frame 120, 130: first and second stator

140: Rotor 151,153,155: First, second and third bearings

161: guide member 165: support member

171,175: first and second elastic members 180:

The present invention relates to a hollow linear stepping motor.

Stepping motors are lightweight, compact, slim and high performance devices and are widely used in devices requiring precise control.

Since a general stepping motor is sealed inside, it can not transmit light to the inside of the motor. Further, in the case of a hollow hollow stepping motor having a central portion, a motion converting mechanism for converting a rotational motion of the motor into a linear motion is provided on the central axis of the motor, so that light can not also be transmitted to the inside of the motor.

As a result, the conventional stepping motor has a limited use place and a place to install it.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hollow linear stepping motor which is not limited to a place of use and an installation place.

According to an aspect of the present invention, there is provided a hollow linear stepping motor including: a ring-shaped frame; A stator arranged and fixed to surround the outer surface of the frame; A rotor installed inside the stator and rotating in response to the stator; And a tubular moving member which is rotatably mounted on an inner circumferential surface of the frame by being coupled to the outer circumferential surface thereof and rotates by the rotor and linearly moves in the direction of the central axis of the frame.

Hereinafter, a hollow linear stepping motor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a hollow linear stepping motor according to an embodiment of the present invention.

As shown in the figure, a substantially ring-shaped frame 110 having a first frame 111 located on the upper side and a second frame 115 located on the lower side is provided, .

Hereinafter, the term " upper side and upper side ", the direction toward the lower side and the side of the frame 110 are referred to as " Bottom and bottom ".

A ring-shaped stator is arranged and fixed between the first frame 111 and the second frame 115 so as to surround the outer surface of the first frame 111. The stator has first and second stators 120 and 130 coupled to each other, and a ring-shaped rotor 140 (see FIGS. 2 and 3) is rotatably installed inside the stator.

Inside the frame 110, there is provided a tubular moving member 180 which is rotated by the rotor 140 and linearly reciprocates in the direction of the central axis of the frame 110.

Since the hollow linear stepping motor according to this embodiment is hollow, light can be transmitted through the inside of the moving member 180. That is, the light emitted from the sensor (not shown) passes through the motion member 180, is reflected by a mirror (not shown) provided in the motion member 180 and is irradiated to a desired position, And is received by the sensor through the mirror again, so that desired data can be obtained.

Reference numeral 153 in Fig. 1 denotes a second bearing.

The frame 110 and the stator will be described with reference to Figs. 2 and 3. Fig. Fig. 2 is a sectional view taken along the line "A-A" in Fig. 1, and Fig. 3 is an exploded perspective view of the frame and the stator shown in Fig.

As shown in the figure, the first frame 111 is formed in a ring shape and includes a support tube 112 having a first screw thread 112a formed on an inner circumferential surface thereof and a support tube 112 extending radially And has a protruded support frame 113.

The second frame 115 is formed in a ring shape and is positioned on the lower side of the support frame 113 and faces the lower face of the support frame 113.

The first stator 120 and the second stator 130 which are coupled to each other are arranged to surround the outer surface of the support pipe 112 under the support frame 113 so as to surround the support frame 113 and the second frame 115, As shown in Fig.

The second frame 115 is coupled to the second stator 130.

The first and second stators 120 and 130 include first and second ring-shaped outer yokes 121 and 131, ring-shaped first and second inner yokes 123 and 133, ring-shaped first and second bobbins 125 and 135, And first and second coils 127 and 137, respectively.

The first stator 120 is inserted and fixed to the outer circumferential surface of the support tube 112 adjacent to the support table 113.

The first outer yoke 121 has a ring-shaped first outer frame 121a and a ring-shaped first outer frame 121a. The first outer frame 121a includes a first outer frame 121a and a second outer frame 121b. And a plurality of first outer toothed portions 121c extending from the inner peripheral surface of the first extended frame portion 121b to the lower second frame portion 115 side. At this time, the first outer teeth 121c are equally spaced from each other.

The first inner yoke 123 is formed in a ring shape and has a first support frame 123a coupled to a lower side of the first outer frame 121a, a support frame 113 And a plurality of first inner teeth 123b extending from the first inner teeth 123b. At this time, the first inner teeth 123b are mutually equally spaced, and the respective first inner teeth 123b are inserted and coupled between the mutually adjacent first outer teeth 121c.

The first bobbin 125 is disposed between the first outer yoke 121 and the first inner yoke 123 and more specifically between the first outer bobbin 121a and the first extended bobbin 121b, And the first coil 127 is wound around the first bobbin 125. The first bobbin 125 is wound around the first bobbin 125,

The second stator 130 is inserted and fixed to the outer circumferential surface of the support tube 112 adjacent to the second frame 115.

The second outer yoke 131 is formed by extending from the lower surface of the second outer frame 131a opposite to the second outer frame 131a to the center of the second outer frame 131a And a plurality of second outer teeth 131c extending from the inner peripheral surface of the second extended frame 131b to the upper supporting frame 113 side. At this time, the second outer teeth 131c are equally spaced from each other.

The second inner yoke 133 includes a second support frame 133a formed in a ring shape and coupled to the upper surface side of the second outer frame 131a and a second support frame 133b formed on the lower side of the inner peripheral surface of the second support frame 133a And a plurality of second inner teeth 133b extending from the first inner teeth 133a. At this time, the second inner teeth 133b are mutually equally spaced, and the respective second inner teeth 133b are inserted and coupled between the mutually adjacent second outer teeth 131c.

The lower surface of the first outer frame 121a and the upper surface of the second outer frame 131a are coupled to each other and the first support frame 123a and the second support frame 133a are brought into contact with each other.

The second bobbin 135 is disposed between the second outer yoke 131 and the second inner yoke 133 and more specifically between the second outer frame 131a and the second extended frame 131b, And the second coil 137 is wound around the second bobbin 135. The second bobbin 135 is inserted into the space formed by the first and second support frames 131c and 133b and the second support frame 133a.

The first and second terminal boards 125a and 135a are formed to correspond to the first and second bobbins 125 and 135 and are exposed to the outside of the first and second stators 120 and 130. To this end, first and second depression grooves 121aa and 131aa are formed on the lower and upper surfaces of the first and second outer frames 121a and 131a, respectively. The first and second recessed grooves 121aa and 131aa form through holes when the first outer yoke 121 and the second outer yoke 131 are coupled and pass through the through holes to form first and second The terminal plates 125a and 135a are exposed to the outside of the first and second stators 120 and 130. [

The first and second terminal plates 125a and 135a transmit external power to the first and second coils 127 and 137, respectively.

The rotor 140 and the motion member 180 will be described with reference to Figs. 2 to 4. Fig. 4 is an exploded perspective view of the frame and the rotor shown in Fig.

The rotor 140 will be described.

As shown in the figure, the rotor 140 is provided in a ring shape and is provided between the outer surface of the frame 110 and the stator, more specifically between the support tube 112 and the support frame 113 and the first and second stators 120 and 130 And the second frame 115, as shown in Fig. At this time, the rotor 140 is a magnet.

Thus, as the first coil 127 and the second coil 137 are selectively supplied with electric current, the rotor 140 rotates in the forward and reverse directions by the action of the stator and the rotor 140.

A first bearing 151 is interposed between the outer peripheral surface of the support tube 112 on the lower side of the support frame 113 and the inner peripheral surface of the upper side of the rotor 140. The first bearing 151 is coupled to the inner circumferential surface of the rotor 140 or the outer circumferential surface of the support tube 112 to help the rotor 140 rotate smoothly.

In order for the rotor 140 to rotate in the stationary state, or for the rotating rotor 140 to rotate smoothly, the rotor 140 must have a clearance in the direction of the central axis. Ring-shaped first and second elastic members 171 and 175 (see FIG. 1) are provided between the lower surface of the support frame 113 and the upper surface of the rotor 140, and between the upper surface of the second frame 115 and the lower surface of the rotor 140. [ Respectively. The first and second elastic members 171 and 175 apply a preload so that the rotor 140 can flow in the direction of the central axis.

Each of the first and second elastic members 171 and 175 is formed so as to be inclined with respect to a virtual horizontal plane so that the heights of the outer peripheral side and the inner peripheral side are different from each other (see FIG. 2). This is because the first and second elastic members 171 and 175 have greater elasticity.

The first and second elastic members 171 and 175 may be installed such that the inclined directions of the outer and inner circumferential surfaces of the first and second elastic members 171 and 175 are directed to the same direction or may be directed to the opposite direction.

Ring-shaped first and second washers 173 and 177 are interposed between the first elastic member 171 and the upper surface of the rotor 140 and between the second elastic member 175 and the lower surface of the rotor 140 . The first and second washers 173 and 177 prevent the first and second elastic members 171 and 175 from directly contacting the rotor 140 to prevent the rotor 140 from being worn.

The motion member 180 will be described.

As shown in the figure, the tubular moving member 180 has an outer circumferential surface coupled to the inner circumferential surface of the frame 110 to be rotatable, rotates by the rotator 140, and is supported on the rotor 140 side And linearly moves in the direction of the central axis of the frame 110.

A second screw thread 183a is formed on the outer circumferential surface of the moving member 180 to engage with the first screw thread 112a of the first frame 111. [ At this time, the second threaded line 183a is formed on the protruding surface 183 protruding from the outer circumferential surface of the moving member 180.

A guide member 161 for transmitting the rotational force of the rotor 140 to the moving member 180 is interposed between the lower outer circumferential surface of the moving member 180 and the inner circumferential surface of the rotor 140. [

The guide member 161 is formed in a ring shape so that the outer circumferential surface thereof is coupled to the inner circumferential surface of the rotor 140 and the outer circumferential surface of the lower side of the movement member 180 is inserted and coupled to the inner circumferential surface thereof. Since the guide member 161 is coupled to the rotor 140, the guide member 161 rotates by the rotor 140. [ The inner circumferential surface of the guide member 161 and the outer circumferential surface of the lower side of the moving member 180 are formed into a noncircular shape corresponding to each other along the circumferential direction so that the guide member 161 can rotate the moving member 180 do. More specifically, the inner circumferential surface of the guide member 161 and the outer circumferential surface of the lower side of the motion member 180 are formed in such a manner that the planar surface and the curved surface alternate with each other along the circumferential direction. Then, the motion member 180 is rotated by the guide member 161.

A second bearing 153 is interposed between the upper inner peripheral surface of the support tube 112 and the upper outer peripheral surface of the motion member 180. The outer circumferential surface of the second bearing 153 is coupled to the inner circumferential surface of the support pipe 112 to facilitate smooth rotation of the motion member 180.

An outer circumferential surface of a ring-shaped support member 165 which is in contact with the inner circumferential surface of the second frame 115 and supports the rotational motion of the rotor 140 is coupled to the inner circumferential surface of the guide member 161. A stepped surface 161a (refer to FIG. 2) in which the upper side of the support member 165 is engaged is formed on the inner peripheral surface on the lower end side of the guide member 161 for rigid engagement of the support member 165.

A third bearing 155 is interposed between the outer circumferential surface of the support member 165 and the inner circumferential surface of the second frame 115. The outer circumferential surface of the third bearing 155 is coupled to the inner circumferential surface of the second frame 115 to facilitate the smooth rotation of the support member 165. A stepped surface 155a is formed at the lower surface of the third bearing 155 on the outer circumferential surface of the third bearing 155 so that the inner circumferential surface of the second frame 115 is engaged with the third bearing 155.

The operation of the hollow linear stepping motor according to this embodiment will be described with reference to FIG.

As shown in the figure, when current is selectively supplied to the first and second coils 127 and 137, the rotor 140 rotates by the action of the stator and the rotor 140.

When the rotor 140 rotates, the guide member 161 and the support member 165 also rotate, and the guide member 161 rotates the motion member 180 as well.

Since the second screw thread 183a formed on the outer circumferential surface of the motion member 180 is engaged with the first screw thread 112a formed on the support tube 112 of the frame 110, And linearly reciprocates while rising or falling along the forming direction of the first and second threaded lines 112a and 183a.

Since the motion member 180 has a hollow tube shape, the light emitted from the sensor passes through the interior of the motion member 180.

As described above, since the hollow linear stepping motor according to the present invention is formed with hollow hollow bodies, the light emitted from the sensor passes through the inside of the motor. Therefore, it can be used without restriction on the place of use and installation place.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Of course.

Claims (23)

A ring-shaped frame; A stator arranged and fixed to surround the outer surface of the frame; A rotor installed inside the stator and rotating in response to the stator; A tubular moving member provided on an inner peripheral surface of the frame so as to be coupled to the outer peripheral surface thereof so as to be rotatable and linearly moving in the direction of the central axis of the frame by rotation of the rotor, And a guide member interposed between the motion member and the rotor to transmit the rotational force of the rotor to the motion member, Wherein the guide member is formed in a ring shape, an outer peripheral surface thereof is coupled to an inner peripheral surface of the rotor, Wherein the one outer circumferential surface of the moving member and the inner circumferential surface of the guide member are non-circularly formed to correspond to each other along the circumferential direction, and are inserted and coupled with each other. The method according to claim 1, A first frame having a support tube formed in a ring shape and having a first screw thread on an inner circumferential surface thereof and a support frame protruding from an outer circumferential surface of the support tube; And a ring-shaped second frame disposed opposite to one surface of the support frame and coupled to the stator. 3. The method of claim 2, Wherein the stator has a first stator and a second stator which are coupled to each other to surround the support pipe and are fixed between the support frame and the second frame. The method of claim 3, The first and second stators may include ring-shaped first and second outer yokes, ring-shaped first and second ring-shaped first and second outer yokes, respectively, which are inserted into the first and second outer yokes from the inside of the first and second outer yokes, A first inner yoke, a second inner yoke, a ring-shaped first and second bobbins respectively inserted between the first outer yoke and the first inner yoke and between the second outer yoke and the second inner yoke, Each having first and second coils respectively wound on a bobbin, Wherein the first stator is provided on the support frame side, and the second stator is provided on the second frame side. 5. The method of claim 4, The first outer yoke includes a first outer frame, a first extended frame extending from one side of the first outer frame opposite to the support frame to the center side, a first extended frame extending from the inner peripheral surface of the first extended frame to the second frame side And a plurality of first outer teeth having an interval, Wherein the first inner yoke has a ring shape and is coupled to the other surface side of the first outer frame, and a second inner frame that extends from the inner peripheral surface of the first support frame toward the support frame side, A plurality of first medial teeth engaged with the lateral teeth, The second outer yoke includes a second outer frame, a second extended frame extending from one side of the second outer frame opposite to the second frame to the center side, and a second extended frame extending from the inner peripheral surface of the second extended frame toward the support frame side A plurality of second outer teeth having an interval, Wherein the second inner yoke has a ring shape and is coupled to the other surface side of the second outer frame and is in contact with the first support frame, And a plurality of second inner teeth extending and interdigitated and engaged with the second outer teeth. 6. The method of claim 5, The first and second bobbins may have first and second terminal plates, respectively, Wherein the first terminal plate and the second terminal plate are connected to the first outer yoke and the second outer yoke when the other surface of the first outer frame and the other surface of the second outer frame are coupled to each other, (2) A hollow linear stepping motor in which first and second depressed grooves are formed, each of the first and second depressed grooves allowing the outer yoke to be exposed to the outside. 3. The method of claim 2, And the rotor is a ring-shaped magnet rotatably provided in the space between the support tube, the support frame, the stator, and the second frame. 8. The method of claim 7, And a first bearing for facilitating smooth rotation of the magnet is interposed between the outer circumferential surface of the support tube and the inner circumferential surface of the magnet. 8. The method of claim 7, Shaped first and second elastic members are interposed between the support frame and one surface of the magnet and between the second frame and the other surface of the magnet. 10. The method of claim 9, Wherein an outer peripheral surface side and an inner peripheral surface side of the first elastic member and an outer peripheral surface side and an inner peripheral surface side of the second elastic member are inclined at different heights with respect to a virtual horizontal plane. 11. The method of claim 10, Wherein the first and second elastic members have the same direction of inclination. 11. The method of claim 10, Wherein the first and second elastic members are opposite in the oblique direction. 10. The method of claim 9, And a first and a second washer are interposed between one surface of the first elastic member and the magnet, and between the second elastic member and the other surface of the magnet, respectively. 3. The method of claim 2, Wherein the motion member is formed in a tubular shape, one outer peripheral surface is coupled to the ring-shaped rotor side, and a second threaded line engaging with the first screw thread is formed on the outer peripheral surface at the center side. 15. The method of claim 14, And the second thread is formed on a protruding surface protruding from an outer circumferential surface of the moving member. delete delete The method according to claim 1, Wherein the one outer circumferential surface of the motion member and the inner circumferential surface of the guide member are formed in such a manner that a plane and a curved surface alternate along the circumferential direction so as to correspond to each other. 3. The method of claim 2, And an outer circumferential surface of a ring-shaped support member, which is supported by the inner circumferential surface of the guide member in contact with the inner circumferential surface of the second frame and supports the rotational motion of the rotor, is coupled. 20. The method of claim 19, And a stepped surface on which the support member is engaged is formed on an inner circumferential surface on one end side of the guide member. 15. The method of claim 14, And a second bearing for facilitating smooth rotation of the motion member is interposed between the inner circumferential surface of the support tube and the outer circumferential surface of the motion member. 20. The method of claim 19, And a third bearing for facilitating smooth rotation of the support member is interposed between the outer circumferential surface of the support member and the inner circumferential surface of the second frame. 23. The method of claim 22, And a stepped surface on which an inner peripheral surface side of the second frame is placed is formed on an outer peripheral surface side of the third bearing.

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