JPH02107837A - Electromagnetic brake - Google Patents

Abstract

PURPOSE:To cost down by forming one member with 2 members of inside and outside of it, fixing them integrally in a shape inserted to the trim ring at the predetermined space in the radial direction and while injecting the non- magnetic molding material for forming the trim ring into the space to solidify it. CONSTITUTION:Since the flux generated by turning-on an excitation coil 5 is formed with a yoke 2 and an armature 11 as the flux circuit, the armature 11 is magnetically adsorbed to the yoke 2 against the spring force of a plate spring 10 so as to brake a motor shaft 8. On the other hand, when the electricity to the excitation coil 5 is cutoff, the flux is floated to be disappeared, and since the armature 11 is separated from the yoke 2 by the plate spring 10, the braking of the motor 8 is disengaged. And the flux circuit by the residual flux disappears early because the flux cutting layer of aluminium as the molding material of a racket 1 is formed in the space S on the way of it, and the disengagement of braking is performed well.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an electromagnetic device in which a magnetic breakage layer for eliminating the residual magnetic flux circuit is formed on either the yoke or the armature, which forms the magnetic flux circuit of the excitation coil. It's about brakes.

[Prior art] An electromagnetic brake magnetically attracts the armature to the yoke by energizing the excitation coil and generating magnetic flux.Therefore, there is no air gap in the magnetic flux circuit consisting of the armature and yoke, and the energization of the excitation coil is prevented. At the moment when the brake is turned off, the release of the brake is delayed due to the residual magnetic flux. Therefore,
This kind of delay can be solved by providing a magnetically insulating layer in the magnetic flux circuit.A concrete way to do this is to configure the yoke and armature with two members and place a non-magnetic material such as copper or aluminum between these members. It is known to form a magnetic insulation layer by providing a space without intervening or using such a nonmagnetic material (see Japanese Utility Model Publication No. 51-28530).

[Problems to be Solved by the Invention] In general, a manufacturing method for forming such a magnetic breakdown layer involves, for example, preparing an outer and inner member that is thicker than the dimensions of the finished product, and then forming a flange on the outer circumference of the inner member. By fitting the outer member to the outer member, a predetermined gap in the radial direction is obtained between the outer and inner members. Then, by injecting copper, which is a non-magnetic material, into this gap and solidifying it, these outer and inner members are fixed together.

Furthermore, among the side surfaces of the outer and inner members integrated in this way, the side surface having the flange formed on the inner member is finished cutting by machining until the copper is visible (Japanese Patent Application Laid-Open No. 1983-1989).
(Refer to Japanese Patent Application No. 194040, Prior Art) Therefore, in order to form a magnetically isolated layer having minute dimensions,
There is a problem in that the number of processes increases and the manufacturing cost increases.

An object of the present invention is to provide an inexpensive electromagnetic brake having a magnetic interruption layer.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a yoke in which an excitation coil is installed, and an armature arranged to be magnetically attracted to the yoke.

In an electromagnetic brake in which an electromagnetic m is formed on one of the yoke and the armature, which form the magnetic flux circuit, one member is composed of two members, an outer and an inner member, and is inserted into the outer frame with a predetermined gap in the radial direction. It is characterized in that the non-magnetic molding material forming the outer frame is injected and solidified into the gap while being fixed integrally, so that the magnetic insulation layer is formed of the molding material.

[Function] In an electromagnetic brake, the magnetic flux of the excitation coil passes through the magnetic insulation layer to form a magnetic flux circuit, so after the excitation coil is turned off, the residual magnetic flux disappears quickly and the brake is released smoothly. Ru.

[Example] Fig. 1 is a sectional view showing an example of an electromagnetic brake in which a magnetic insulation layer is formed on the yoke side, and Fig. 2 is a cross-sectional view showing an example of an electromagnetic brake in which a magnetic insulation layer is formed on the armature side. FIG. Explaining based on these drawings, the embodiment shown in Fig. 1 has a yoke 2 inserted and fixed integrally to a motor bracket 1 as an outer frame formed by aluminum die-casting or aluminum casting. This is electromagnetic brake A.

This electromagnetic brake A is constructed by inserting an outer member 3 made of an annular member having a substantially L-shaped cross section and an inner member 4 made of a cylindrical member into a bracket 1 with an annular gap S therebetween. The yoke 2 has a fixed yoke 2.
Inside, an excitation coil 5 is fixed to the inner thigh with insulating resin.
Further, a friction plate 6 is fitted and fixed to the open end of the yoke 2. The yoke 2 having such a structure supports the motor shaft 8 inserted into the center hole of the bracket 1 via the bearing 7.

A hub 9 is connected to the motor shaft 8 by key fitting or the like.
The armature 11 supported via the leaf spring 10 is
It is arranged to face the friction plate 6 of the yoke 2 and to be freely magnetically attracted to the yoke 2.

In the electromagnetic brake A having such a structure, the magnetic flux Φ generated by energizing the excitation coil 5 flows through the yoke 2 as shown in the figure.
and armature 11 as a magnetic flux circuit,
The armature 11 is magnetically attracted to the yoke 2 against the spring force of the leaf spring 10.

Then, the motor shaft 8 is braked. On the other hand, exciting coil 5
When the power to armature 1 is cut off, the magnetic flux Φ disappears, and armature 1
1 is separated from the yoke 2 by the plate spring 10, so that the braking of the motor shaft 8 is released.

Further, since the magnetic flux circuit caused by the residual magnetic flux is quickly dissipated because the magnetic flux circuit made of aluminum, which is the molding material of the bracket 1, is formed in the gap S, the brake is released smoothly.

In this embodiment, the outer frame is a bracket for the motor, but it may be simply mounted on a braked machine using a plate, and the gap S may be an intermittent gap instead of an annular gap. Often, these designs can be modified accordingly.

Next, in the embodiment shown in FIG. 2, an armature 15 is inserted into a cover 14 formed by aluminum die-casting, aluminum casting, etc., in which heat dissipation fins 12 as an outer frame and an inner step 13 are formed. This is an electromagnetic brake B that is fixed in one piece.

This electromagnetic brake B connects a disc-shaped outer member 16 and a disc-shaped inner member 17 to a cover 1 with an annular gap S''.
A hub 20 is provided with an armature 15 that is integrally fixed by being inserted into a motor shaft 19, and an armature guide 18 that is bolted to a cover 14 and that is keyed to a motor shaft 19.
By spline fitting the armature 15 to the motor shaft 19, the armature 15 is supported movably only in the axial direction.

In addition, this electromagnetic brake B has an auto gap ring 21 press-fitted to the hub 20, and a compression coil spring 2.
The armature guide 18 pressed by the auto gap ring 2 is moved backward by the inner step 13 of the cover 14.
It is regulated by coming into contact with 1. A gap g is formed between the auto gap ring 21 and the armature guide 18.

On the other hand, the armature 15 having such a structure has the friction plate 2 of the yoke 24 fixed to the motor bracket 23.
5 and are arranged opposite to each other with a gap having the same size as the gap g. The excitation coil 2 installed inside the yoke 24
The magnetic flux Φ generated by energizing 6 forms a magnetic flux circuit as shown in the figure.

The electromagnetic brake B having such a structure is different in that the electromagnetic brake A uses a spline type and an automatic gap adjustment type having an auto gap ring 21, whereas the electromagnetic brake A uses a leaf spring type as an example. Since the operation is similar to that of the electromagnetic brake A, the explanation thereof will be omitted.

In this embodiment, a spline type is illustrated, but a leaf spring type may be used, and the gap S' may be an intermittent gap instead of an annular gap, and these designs can be changed as appropriate.

Further, in the above description, an electromagnetic brake using aluminum as the molding material was exemplified, but as long as the electromagnetic brake has a small braking torque, the molding material may be plastic, and the molding material may be any non-magnetic material.

[Effects] As described above, the electromagnetic brake of the present invention includes a yoke in which an excitation coil is installed, and an armature that is arranged to be magnetically attracted to the yoke. In an electromagnetic brake in which a magnetism-interrupting layer is formed on one side, the one member is composed of two members, an outer and an inner member, which are inserted into the outer frame with a predetermined gap in the radial direction and are fixed together, and the outer frame is fixed to the outer frame. The non-magnetic molding material forming the molding material is injected and solidified into the gap to form the magnetically-destructive layer with the molding material, and then the magnetically-destructive layer is formed by a manufacturing method such as aluminum die-casting or aluminum casting. Since many manufacturing processes such as machining can be omitted, an inexpensive electromagnetic brake can be provided.

In addition, in the present invention, the molding material forming the magnetic breakdown layer allows
For brackets and mounting of motors, plates, covers, etc. can be integrally formed, resulting in fewer parts and easier assembly work.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an electromagnetic brake that is an embodiment of the present invention, and FIG. 2 is a cross-sectional view of an electromagnetic brake that is another embodiment of the present invention. Bracket as outer frame, 2.24...Yoke, 3.1
6...Outer member, 4.17...Inner member, 5.26...Excitation coil, 11.15...
...Armature, 14...Cover as outer frame, S/S'...Gap, Φ...Magnetic flux.

Claims (1)

[Claims] An electromagnetic brake comprising a yoke having an excitation coil therein and an armature disposed on the yoke so as to be magnetically attracted to the yoke, and a magnetically disconnecting layer is formed on one of the yoke and the armature forming a magnetic flux circuit. The component is composed of two members, an outer and an inner part, which are inserted into an outer frame with a predetermined gap in the radial direction and fixed together, and the non-magnetic molding material forming the outer frame is injected and solidified into the gap. An electromagnetic brake characterized in that the magnetism-interrupting layer is formed of the molding material.