JPS61124257A - Linear motor - Google Patents

Abstract

PURPOSE:To obtain a lateral vibration preventing mechanism of a mover having a simple structure and high reliability by providing two or more rigid material wheels pressed one side of a stator and on or more elastic material wheels pressed on the other side in the mover. CONSTITUTION:A mover 22 is so disposed as to move by wheels 23 longitudinally with respect to a stator 21 formed with pole teeth at the prescribed pitch longitudinally. Axles 28,30 are extended laterally with respect to the moving direction from the mover 22, and wheels 27, 29 are so mounted as to press to the sides of the stator 21. The wheel 27 of one side is formed of a rigid material, two or more are provided at the front and rear, the wheel 29 of the other side is formed at least partly by an elastic material, and one or more are provided. Thus, the mover 22 is prevented from laterally vibrating without using a retaining spring.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lateral vibration prevention mechanism for a mover of a linear motor used as a direct drive source for linear motion of various types of equipment.

Conventional technology analysis Sho - 11 Near motor d - Old 1 ← Masu IJ hair - Ta b τ eye The mechanism is simplified because there is no need for a mechanism to convert the rotational motion of pulleys, wires, etc. into linear motion.

Due to its improved reliability, it has come to be widely used as a linear actuator in office machines, measuring instruments, etc. However, since lateral vibration of the mover relative to the stator causes fluctuations in the thrust of the linear motor and deterioration of stopping accuracy, measures are required to prevent the mover from lateral vibration.

Hereinafter, an example of the above-mentioned conventional linear motor will be described with reference to the drawings.

FIG. 6 is a diagram showing a lateral vibration prevention mechanism of a conventional mover of a linear motor, and FIG. 6 is a view seen from the direction E shown in FIG. In FIGS. 5 and 6, 1 is a stator, and 2 is a mover, which runs on the stator 1. Reference numeral 3 denotes wheels, which allow the mover 2 to run smoothly on the stator 1. 4 is an adapter, Mova 2
It has been running for a long time. 5 and 6 are the first and second side surfaces of the stator, respectively. Reference numeral 7 denotes a rigid wheel, which runs while being pressed by the first side surface 6 of the stator 1.

8 is an axle, which is fixed to the mover 2 and supports the wheel. 9 is a rigid wheel, and the second side 6 of the stator 1
Run while being pushed by. 1o is an axle, and wheel 9
to take medical care. 11 is a sprung plate, and the axle 9 is the stator 1
The axle 1o is pressed so as to press the second side surface 6 of the vehicle. A pedestal 12 is provided on the adapter 4 and is used to fix the plate spring 11. 13 is a screw,
This is for fixing the spring 11 to the base 12 so that the leaf spring 11 is elastically deformed and a pressing force is obtained.

The operation of the near motor configured as described above will be explained below.

First, since the plate spring 11 is attached to the base 12 with the screw 13 so as to cause elastic deformation, the restoring force is applied to the axle 1.
0 acts as a force to press the wheel 9 against the second side 6 of the stator 1. As a reaction force, a force that pulls the mover 2 in the downward direction shown in FIG. 6 acts. However, the rigid axle 7 is in contact with the first side 5 of the stator 1;
Since it is fixed to the mover 2 through the axle 8, the mover 2 does not move downward. That is, the mover 2 can run on the stator 1 without causing lateral vibration. At this time, the wheels 7 and 9 roll while being pressed against the first and second side surfaces of the stator 1.

Problems to be Solved by the Invention However, the above configuration requires parts such as the leaf spring 11, screws 132 and pedestal 12, and when the man-hours for assembling these parts are included, the cost increases considerably. . In addition, these horizontal digging prevention mechanisms occupy a large space and have a disadvantage of having a complicated structure.

In view of the above-mentioned drawbacks, the present invention provides a 7K IJ near motor with a simple, highly reliable, and inexpensive lateral shake prevention mechanism for a mover.

Means for Solving the Problems In order to solve the above problems, the linear motor of the present invention has the following features:
a stator, a mover capable of longitudinally moving along the stator, and at least two wheels fixed to the mover so as to be pressed against a first side surface of the stator and formed of a rigid body. and at least one wheel fixed to the mover so as to be pressed against the second side surface of the stator, and at least one wheel made of an elastic body or entirely made of an elastic body. There is.

Function: With the above-described configuration, the elastic wheel is deformed by pressure, and its restoring force acts as a force that presses the rigid wheel against the side surface of the stator. Since the rigid wheels are fixed to the mover, the mover moves along the first side surface of the stator, thereby preventing lateral vibration.

EXAMPLE Hereinafter, a linear motor according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a linear motor in an embodiment of the present invention, and FIGS. 2 and 3 are respectively shown in FIG.
It is a view seen from directions A and B. In Fig. 1.2.3, 21 is a stator, 22 is a mover, 23 is a wheel for the mover 22 to run on the stator 21, 24 is an adapter fixed to the mover 22, and 25 and 26 are the wheels of the stator 21, respectively. The first and second side surfaces 27 are rigid wheels fixed to the mover 22 and run while being pressed by the first side surface 25 of the stator 21. , 28 are fixed to the mover 22, 7 is an axle, and the axles 23 and 27 are fixed. Reference numeral 29 denotes an elastic wheel fixed to the mover 22, which runs while being pressed by the second side surface 26 of the stator 21. This is the axle of the 30id wheel 29 and is fixed to the adapter 24.

The operation of the near motor constructed as described above will be explained with reference to FIG.

First, the axle 30 is processed so as to be located at the center of the wheel 29, and the axle 30 is fixed to the stator 21 so that the elastic wheel 29 is pressed against the second side surface 26 of the stator 21. This causes two wheels to undergo elastic deformation. wheel 29
The restoring force of C is generated through the axle 30 and adapter 24 in the figure.
This becomes a force that pulls the Mova 22 in the direction. However, since the rigid wheels 27 are in contact with the first side surface 25 of the stator 21 and are fixed to the mover 22 through the axle 28, the mover 22 does not move in the C direction. That is,
Mova 22 does not cause sideways vibration. However, since the mover 22 generates a thrust in the longitudinal direction of the stator 21 and moves, the wheels 27 and 29 move toward the stator 21, respectively.
1st. It will roll while being pressed against the second side surface 25,26.

As described above, according to this embodiment, the two rigid wheels 27 fixed to the mover 22 and the two elastic wheels 27 are fixed to the mover 22.
9 and 1.9 of the stator 21, respectively. By providing pressure on both sides of the second side, there is no need for a conventional presser spring, presser spring attachment mechanism, etc., which saves space.
It is possible to obtain a mover lateral vibration prevention mechanism with a simple structure.

In addition, FIG. 4 shows D in FIG. 2 of the elastic wheel 29.
-D' cross section is shown, but the same effect can be obtained even if an elastic body is used for a part of the wheel as shown in FIGS. 4a to 4d. In FIG. 4, 31 is an elastic body, 32 is an axle closure made of metal or resin, and 33 is a resin or metal that is much harder than the elastic body! The outer ring is 7, 34i" 1. It is a spiral-shaped leaf spring.

Effects of the Invention As described above, the present invention includes at least two wheels fixed to the mover so as to be pressed against the first side surface of the stator and formed of a rigid body, and a second wheel of the stator. fixed to the mover so as to be pressed against the side;
In addition, by providing at least one or more wheels made of an elastic body or a portion of which is made of an elastic body, the lateral shake prevention mechanism of the mover can be realized in a space-saving manner, with a simple structure, and at a low cost, thereby improving industrial performance. The effect is a dog.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a linear motor according to an embodiment of the present invention, FIGS. 2 and 3 are views viewed from direction B shown in FIG. 1, and FIG. 4 is a view of D in FIG. -D/
A cross-sectional view, FIG. 6 is a diagram showing a lateral vibration prevention mechanism of a mover of a conventional linear motor, and FIG. 6 is a view taken from the direction shown in FIG. 5. 21...Suteheta, 22...Mova,
23...Wheel, 24...Adapter, 26...
. . . First side surface of the stator, 26 . . . Second side surface of the stator, 27- . . . Rigid wheel, 28
...Axle, 29 ...Elastic wheel, 30
-・・・Axle. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd floor
-----Stator? 2----Mook dego 3-111 car rate opening ゛2/2ε. 3o---One axle Q Fig. 3 Fig. 4 31- Elastic body (α) 34-1--in J 1 large □*□
1, 31 (d-n)

Claims (1)

[Claims] a stator having magnetic pole teeth formed at a constant pitch in the longitudinal direction; a mover that moves in the longitudinal direction along the stator; and a rigid body fixed to the mover so as to be pressed against a first side of the stator. At least two or more wheels formed of an elastic body or at least one wheel fixed to the mover so as to be pressed against a second side surface of the stator and formed of an elastic body or a part of an elastic body. A linear motor with