JPH0721294B2 - 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 field of application] The present invention relates to an electromagnetic wave in which a demagnetization layer for extinguishing a residual magnetic flux circuit is formed on either one of a yoke and an armature which are magnetic flux circuits of an exciting coil. It is about brakes.

[Prior Art] An electromagnetic brake energizes an exciting coil to generate a magnetic flux, so that the armature is magnetically attracted to the yoke. Therefore, an air gap disappears in a magnetic flux circuit including the armature and the yoke, and the exciting coil is energized. At the moment when is turned off, the release of the braking is delayed due to the residual magnetic flux. Therefore, such a delay can be solved by providing a demagnetization layer in the magnetic flux circuit. As a concrete means thereof, the yoke and the armature are composed of two members and a non-magnetic material such as copper or aluminum is provided between these members. It is known to form a demagnetization layer by providing a space without interposing a material or interposing such a non-magnetic material (see Japanese Utility Model Publication No. 51-28530).

[Problems to be Solved by the Invention] Generally, a manufacturing method for forming such a demagnetization layer is, for example, to prepare an outer-inner member thicker than the size of a finished product and to form an outer peripheral surface of a flange formed on the outer periphery of the inner member. By fitting the outer member to the outer member, a predetermined radial gap is obtained between the outer and inner members. Then, copper, which is a non-magnetic material, is injected into the gap and solidified to integrally fix these outer and inner members. Further, among the side surfaces of the outer-inner member thus integrated, the side surface having the flange formed on the inner member is completely machined until copper can be seen (Japanese Patent Laid-Open No. 62-194040). See the technology).

Therefore, in order to form a demagnetization layer having a minute dimension,
There is a problem that the number of machining increases and the manufacturing cost increases.

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

[Means for Solving the Problems] In order to achieve such an object, the present invention includes a yoke having an exciting coil provided therein and an armature arranged so as to be magnetically attracted to the yoke. In the electromagnetic brake in which the demagnetization layer is formed on either one of the yoke and the armature,
The member is integrally fixed to the outer frame with a predetermined gap in the radial direction inserted into the outer frame, and the non-magnetic molding material forming the outer frame is injected and solidified into the gap, The demagnetization layer is formed of a molding material.

[Operation] In the electromagnetic brake, since the magnetic flux of the exciting coil forms a magnetic flux circuit through the demagnetizing layer, the residual magnetic flux disappears quickly after the energization of the exciting coil is cut off, and the braking is released well. It

[Embodiment] FIG. 1 is a sectional view showing an embodiment of an electromagnetic brake in which a demagnetization layer is formed on a yoke side, and FIG. 2 is an embodiment of an electromagnetic brake in which a demagnetization layer is formed on an armature side. It is sectional drawing shown. Explaining with reference to these drawings, first, the embodiment shown in FIG. 1 is a motor bracket 1 as an outer frame formed by aluminum die casting, aluminum casting, or the like.
In the electromagnetic brake A, the yoke 2 is inserted and fixed integrally.

The electromagnetic brake A is integrally formed 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 the bracket 1 with an annular gap S therebetween. The yoke 2 is fixed, and the yoke 2
Inside, the exciting coil 5 is internally fixed by insulating resin,
A friction plate 6 is fitted and fixed to the opening-side end of the yoke 2. The yoke 2 having such a structure supports the motor shaft 8 inserted through the bearing 7 in the center hole of the bracket 1.

A hub 9 connected to the motor shaft 8 by key fitting or the like.
An armature 11 supported by a leaf spring 10 is arranged opposite to the friction plate 6 of the yoke 2 so as to be magnetically attracted to the yoke 2.

In the electromagnetic brake A having such a structure, the magnetic flux Φ generated when the exciting coil 5 is energized generates the magnetic flux Φ as shown in FIG.
Since the armature 11 and the armature 11 are formed 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, when the excitation coil 5 is de-energized, the magnetic flux Φ disappears and the armature 11 is separated from the yoke 2 by the leaf spring 10, so that the braking of the motor shaft 8 is released.

Further, the magnetic flux circuit based on the residual magnetic flux is quickly eliminated because the demagnetization layer made of aluminum, which is the molding material of the bracket 1, is formed in the gap S in the middle thereof, and the braking is released well.

In this embodiment, the outer frame is the bracket of the motor, but it may be a mounting plate for simply mounting on the braked machine, and the gap S may be an intermittent gap instead of an annular gap. , These designs can be changed appropriately.

Next, in the embodiment shown in FIG. 2, an armature 15 is inserted into a cover 14 having a heat radiating fin 12 as an outer frame and an inner step 13 formed by aluminum die casting or aluminum casting. It is an electromagnetic brake B integrally fixed in shape.

The electromagnetic brake B is provided with an armature 15 integrally fixed by inserting a disc-shaped outer member 16 and a disc-shaped inner member 17 into a cover 14 with an annular gap S ′. Armature guide bolted to 14 18
The armature 15 is supported on the motor shaft 19 so as to be movable only in the axial direction by spline-fitting to the hub 20 keyed to the motor shaft 19. Further, in this electromagnetic brake B, an auto gap ring 21 is press-fitted into a hub 20, so that the armature guide 18 is retracted by a compression coil spring 22 and the inner step 13 of the cover 14 is moved to the auto gap ring 21. It is regulated by abutting against.
And the auto gap ring 21 and armature guide
A gap g is formed between this and 18.

On the other hand, the armature 15 having such a structure is arranged to face the friction plate 25 of the yoke 24 fixed to the motor bracket 23 with a gap having the same size as the gap g.
Then, the magnetic flux Φ generated by energizing the exciting coil 26 provided inside the yoke 24 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 exemplifies the leaf spring system but the spline system and the automatic gap adjusting type having the auto gap ring 21. Since the operation is the same as that of the electromagnetic brake A, its description is omitted.

In this embodiment, the spline method is exemplified, but a leaf spring method may be used, and the gap S ′ may be an intermittent gap instead of an annular gap, and these designs can be appropriately changed.

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

[Effect] As described above, in the electromagnetic brake of the present invention, the yoke having the exciting coil therein and the armature arranged so as to be magnetically attracted to the yoke are provided. In an electromagnetic brake having a demagnetization layer formed on one side thereof, the one side member is constituted by two members inside and outside, and is fixed integrally with the outer frame while being inserted into the outer frame with a predetermined gap in the radial direction. Since the non-magnetic molding material forming the is filled into the gap and solidified to form the demagnetization layer with the molding material, the demagnetization 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.

Further, in the present invention, by the molding material forming the demagnetization layer,
It is possible to integrally form a bracket such as a motor, a mounting plate, a cover, and the like, and it is possible to obtain an effect that the number of parts is small and the assembling work is simple.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic brake which is an embodiment of the present invention, and FIG. 2 is a sectional view of an electromagnetic brake which is another embodiment of the present invention. In the drawing, 1 ... bracket as outer frame, 2/24 ... yoke, 3
・ 16 …… 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] 1. A yoke having an exciting coil therein, and an armature arranged so as to be magnetically attractable to the yoke,
In an electromagnetic brake in which a demagnetization layer is formed on either one of the yoke and the armature, which form the magnetic flux circuit, the one member is composed of two outer and inner members and is inserted into an outer frame with a predetermined radial gap. The electromagnetic brake is characterized in that the demagnetizing layer is formed of the non-magnetic molding material that forms the outer frame by injecting and solidifying the non-magnetic molding material into the gap.