JPS6130952A - Yoke structure of linear motor - Google Patents

Abstract

PURPOSE:To readily position both yokes at assembling time by feeding compressed air to the bonding surfaces of the both yokes so that the both yokes are not contacted by the compressed by to overcome the magnetic attraction force. CONSTITUTION:After an upper yoke 14 is bonded on a lower yoke 12, a guide hole 15 is communicated with an external compressed air source to feed the compressed air into the hole 15 to gradually flow out the compressed air from an orifice 17 through a slot pocket 16 toward the outer edge of the yoke. At this time, the pressure of the air film overcome the magnetic attraction force of the yoke 12 by the surface pressure of the air film formed between the yokes 12 and 14, and the yoke 14 is supported to the yoke 12 in noncontacting state. After the yokes 14, 12 are regulated at the positions in this state, the compressed air is shut off to attract fixedly the yoke 14 to the yoke 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention This invention relates to a yoke structure for a large, high-thrust linear motor used to obtain a linear motion output.

(b) Background of the Invention Conventionally, the yoke structure of large, high-thrust linear motors was
The main types were as shown in Figure 4.5.

This yoke structure consists of a lower yoke 2 to which a permanent magnet 1 is fixed.
and the upper yoke 4 with the coil 3 wound therethrough, and the bolt 5
It was concluded and constructed.

To assemble this yoke structure, first the permanent magnet 1 is glued to the lower yoke 2, and then the upper yoke 4 around which the coil 3 is wound is attached.
It is common practice to insert them into the lower yoke 2, combine them, and position and fix them.

However, in this type of high-thrust linear motor, the magnetic attraction force between the yokes is strong, so once the yokes are combined, it is easy to use manual power to align the upper yoke 4 and the lower yoke 2. It was difficult.

For this reason, I hit the yoke with a hammer to align it.
It required assembly using special jigs such as screws and guides, which all resulted in poor work efficiency.

(c) Purpose of the Invention This invention provides compressed air to be fed into both yoke joint surfaces,
To provide a yoke structure for a linear motor that can make both yokes non-contact using compressed air that overcomes magnetic attraction, facilitates positioning when the yokes are combined, and improves workability.

B) Summary of the Invention This invention provides a yoke to which a permanent magnet is fixed, and a yoke to which a coil is wound and inserted, a conduit hole for compressed air is provided on one side, and a pocket portion is provided at the joint surface of the conduit hole and the yoke. It is characterized by an orifice formed between the motor and the yoke structure of a near motor.

(E) Effects of the Invention According to the present invention, compressed air is sent to the joining surfaces of both yokes, and the compressed air overcomes the magnetic attraction force to cause the two yokes to come out of contact, making it possible to easily position the yokes when they are combined. can.

L, 7'j It is easier to assemble the linear motor yoke, there is no need for the previously used assembly jig, and it is also easier to remove the yoke when disassembling it.

(f) Examples of the invention An embodiment of the invention will be described in detail below with reference to the drawings.

The drawing shows the yoke structure of a near motor. In FIG. 1, a lower yoke 12 to which a permanent magnet 11 is fixed and an upper yoke 14 to which a coil 13 is wound and inserted are disposed opposite each other.

A guide hole 15 is provided at both ends of the upper yoke 14 for communicating KEE compressed air, and an orifice 17 is formed between the guide hole 15 and a shallow circular groove 16 provided on the back surface of the upper yoke 14.

With this configuration, after the upper yoke 14 is bonded onto the lower yoke 12 as shown in FIG.
The compressed air is communicated with an external compressed air source (not shown) through a pipe 18 to send compressed air into the guide hole 15. Therefore, the compressed air gradually increases pressure from the orifice 17 to the outer edge of the yoke through the groove pocket 16. It descends and flows out.

At this time, due to the surface pressure of the air film formed between the yokes, the pressure of the air film overcomes the magnetic attraction force of the lower yoke 12, and the upper yoke 14 is moved to the lower yoke 1.
2. Support in a non-contact state.

In this state, the positions of the upper yoke 14 and the lower yoke 12 can be easily adjusted, and they can be moved easily, making it easy to assemble and align the yokes.

After adjusting the upper yoke 14 to the normal position in this way,
When the compressed air is cut off, the upper yoke 14 becomes the lower yoke'
l 2 Adsorb and fix with magnetic attraction. This magnetic attraction is so strong that there is no need for a fixing screw. Of course, fixing screws may also be used.

In addition, the above-mentioned permanent magnet 11, coil 13, yoke 12.
The shape of the orifice 14 is not limited to the illustrated shape, but may be other shapes, and the groove shape of the pocket 16 may also be of various shapes, and the number and location of the orifices 17 may be freely selected. be able to.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway front view of the yoke structure of a beam near motor; FIG. 2 is a side view thereof; FIG. 3 is a sectional view taken along line A-A in FIG. 1; FIG. 4 is a partially cutaway front view showing a conventional example, and FIG. 5 is a side view thereof. 11... Permanent magnet 12... Lower yoke 13
...Coil 14...Upper yoke 15...
・Guiding hole 16... Pocket part 17... Orifice Figure 1 Figure 2 Factor 3 Figure 4 Factor 5

Claims (1)

[Scope of Claims] 1. A conduit hole for communicating compressed air is provided in at least one of a yoke to which a permanent magnet is fixed and a yoke to which a coil is wound and inserted, and a pocket is provided at the joint surface of the conduit hole and the yoke. A yoke structure for a linear motor characterized by an orifice formed between the parts.