JPS58128537A - Electromagnetic coupling apparatus - Google Patents

Abstract

PURPOSE:To reduce the size of an exciting coil and the area of an iron portion, by forming magnetic flux shielding slits tapered such that the sectional area is greater at the opposite side of the friction surface, and thereby increasing the magnetic reluctance of the hollow spaces and reducing the leaked magnetic flux. CONSTITUTION:Tapered slits 16a, 17a are formed in the manner of removing the unnecessary area of the surfaces on the opposite side of friction surfaces. By forming such slits, the area of hollow spaces on the opposite side of the friction surfaces is increased and resistance to the magnetic flux is increased correspondingly. Thus, since the leakage of magnetic flux is reduced, the entire structure of the apparatus can be made compact and the weight is also reduced. At the same time, the manufacturing costs can be lowered. Here, if it is provided that the exciting power of an exciting coil 4 is the same, the width of the slits can be reduced, and the outer diameter of a pulley 6c can be also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slit for magnetic isolation in an electromagnetic coupling table a, and is intended to make magnetic flux work effectively.

First, a conventional device will be explained with reference to FIG. In Figure 1, (1) is a machine frame such as a compressor, and (2) is a plate fixed to this machine frame (1) with bolts, etc.)
, (!1) is a stator fixed to this plate (2) by welding etc., (4) is a resin (5) inside this stator (8).
(6) is a U-shaped rotor provided so as to surround the stator (3);
6&) are magnetic shielding slits provided at several locations around the entire circumference of the rotor (6) in the circumferential direction, (6b) are pulley grooves for inserting the belt of the driving source (not shown), and (7)
The rotor (6) is supported by a bearing inserted into a cylindrical portion (la) K protruding from the machine frame (1). (6o
) Shows the friction surface of the Fi rotor (6). (8) is an armature that is disposed opposite to the friction surface (6C) of the rotor through an axial gap (8) and is movable in the axial direction, and (8&) is provided in the circumferential direction for magnetic isolation. Slit, (8
b) is the friction surface of the armature (8), (9) is the rotating shaft protruding from the compressor frame (1), α0 is the boss, (
b) is a key for fixing the rotating shaft (9) and boss αQ;
(2) has 0 rivets on both ends, (b) is a plate spring fixed to the amateur (8) and the boss, and (to) is a bush fixed to the boss, and the position t of the amateur (8) is It is for regulating purposes. Note that (t8) is p-ta (6
), the magnetic path area of the friction surface, (t) is also an amateur (
8) shows the magnetic path area.

Next, the operation of the above structure will be explained.

First, when the excitation coil (4) is de-energized, the armature (8) is pushed to its final position by the elastic force of the leaf spring (2).
and is opposed to the rotor (6) via the air 1li (2), so the rotational force of the rotor (6) is not transmitted. Next, when the excitation filter (4) is energized, a magnetic flux is generated in the magnetic path shown by the dotted line in the figure, and the armature (8) resists the elastic force of the leaf spring (b) and moves toward the rotor (6). The friction surfaces (6C) and (8b) come into contact and the rotational force is transferred to the rotor (6
), armature (8), leaf spring (6), and boss αG'.

However, the structure described above has the following problems. In other words, the magnetic flux is applied to the friction surfaces (60) (8b
) In addition to the magnetic flux (4)) that passes through and works effectively, there is also a leakage magnetic flux (insect) (Φ2) that passes through Surin) (eaX8a)
was there. Note that this leakage magnetic flux (Φ1) (Φb)Fi generated silk hardly contributes. However, due to these factors, it is necessary to increase the magnetomotive force of the excitation coil (4) or increase the area of the iron part of the magnetic circuit section of the p-tor (6) and stator (8). Leakage magnetic flux (Φ
1) (Φ1), the weight was heavy and the cost was high.

Furthermore, this leakage magnetic flux (Φ, 04%)? In order to reduce or eliminate the problem, the problem can be solved by increasing the width of the pulley (61L) (8&), but doing so increases the outer diameter of the pulley (6b) and causes another problem. Ta.

This invention was made to solve the above-mentioned problems, and one embodiment of this invention will be described below with reference to FIG. 2. In Figure 2, Qe is the rotor, (16m)
) is the friction surface, (16a) Fi is a tapered magnetic shielding slit with a large side formed on the anti-friction surface side, (16G) Fi
This is a pulley for transmitting i-force. Also, a't) Fi amateur chair, (17b) is its friction surface, and (171L) is a tapered magnetic shielding slit with a large anti-friction surface side.0 In the above structure, its operation is the same as the conventional one. Yes, but
This invention is characterized in that the slits (16&) (17&) are tapered to cut unnecessary areas of the anti-friction surface.
The gap on the anti-friction surface side becomes larger, making it more difficult for magnetic flux to pass through. That is, the leakage magnetic flux is reduced, the overall size is compact and the weight is light, and the cost is also reduced.

If this is reversed and the magnetomotive force of the excitation coil (4) is maintained as before, the slit width can be reduced and the outer diameter of the pulley (166) can be reduced.

In the above embodiment, both the rotor acid slit and the amateur aη slit are tapered, but it is also effective to make either one tapered. In addition, although the above description has been made using a tapered slit, the slit may be formed into a shape that is gradually enlarged toward the anti-friction surface side. It goes without saying that the present invention can also be applied to electromagnetic braking devices.

As described above, according to the present invention, since the tapered magnetic shielding slit that increases the anti-friction [ijIm is provided, the magnetic flux resistance of the air gap increases, the leakage magnetic flux decreases, and therefore the excitation coil This has the effect of making the structure more compact as a whole, such as making it smaller and also making the area of the iron part smaller.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing a conventional electromagnetic coupling device.
The figure is a partial sectional view showing an embodiment of the present invention. In the figure, (8) is the stator, (4) is the excitation coil, (to) is the rotor, assistant is the armature, (16&) (17&) are tapered slits, and (16b) and (17b) are the friction surfaces. . Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - 1111th 21st Be1

Claims (3)

[Claims] (1) A rotor having a friction surface, an armature disposed opposite to the friction surface of the rotor via an axial inner space of 11 ft, and an excitation device 1 for bringing the friction surfaces of the rotor and armature into pressure contact, and An electromagnetic coupling device that has opposing slits for magnetic isolation, and is patented in that the slits are tapered so that the side opposite to the friction surface becomes larger. (2) The electromagnetic coupling device according to claim 1, wherein the tapered slit is formed in either the rotor or the armature. (3) The electromagnetic coupling device according to claim 1, wherein the tapered slit is formed in both the rotor and the armature.