JP2010112442A - Electromagnetic clutch for compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic clutch for a compressor, capable of considerably reducing electric power required for the electromagnetic clutch. <P>SOLUTION: The electromagnetic clutch for the compressor includes a rotor connected to a power source, an armature connected to the driving shaft of the compressor for abutting on the rotor to transmit power from the power source to the driving shaft of the compressor, and an electromagnetic coil for excitation-controlling the operation of the rotor and the armature to be relatively positioned in the direction of abutting on or separating each other. The electromagnetic clutch further includes an energizing means is provided for energizing an abutting portion of the rotor on the armature toward the armature with consistent predetermined energizing force. The operating direction of the electromagnetic coil during excitation is set to be a direction of separating the abutting portion of the rotor on the armature from the armature, and the operating force of the electromagnetic coil with excitation in the separating direction is set to be greater than predetermined energizing force of the energizing means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic clutch for a compressor, and more particularly, to an electromagnetic clutch for a compressor that can achieve power saving in accordance with the conditions used.

  The compressor electromagnetic clutch is usually incorporated on the power input side of the compressor in order to control transmission of power from the power source side to the compressor drive shaft side. As such an electromagnetic clutch for a compressor, conventionally, a rotor connected to the power source side, an armature connected to the compressor drive shaft side, and an electromagnetic coil are provided, and the electromagnetic clutch is generated by the electromagnetic coil. The armature and the rotor are pressure-bonded by magnetic force, especially the armature-side friction plate and the rotor-side friction plate are pressure-bonded, and the power transmitted from the power source side to the rotor is transmitted to the compressor drive shaft via the armature. The electromagnetic clutch is well known. Further, when the compressor is a variable capacity compressor, the electric power applied to the electromagnetic coil of the electromagnetic clutch is not a constant value, but the required clutch electric power value is calculated and controlled according to the change in the compressor torque. Thus, there is also known a control device that saves power (for example, Patent Document 1).

All of these electromagnetic clutches for compressors in the prior art generate magnetic force by applying electric power to the electromagnetic coil, and the armature and the rotor are pressure-bonded by using the magnetic force, thereby transmitting power. The excitation of the electromagnetic coil is stopped. Therefore, in order to save power in this type of electromagnetic clutch, it is premised that the electric power applied to the coil when the electromagnetic coil is excited is reduced.
JP 2003-240025 A

  For example, in Japan, the refrigerant compression compressor used in the refrigeration circuit, for example, the refrigerant compression compressor incorporated in the refrigeration circuit of the vehicle air conditioner is operated throughout the year. It is about three times the period, which is a much longer period than the non-operation period. Therefore, to reduce the power consumption of the compressor electromagnetic clutch as described above is effective for power saving (energy saving) for the compressor operated for such a long period of time.

  However, on the other hand, it is not necessary to energize the electromagnetic clutch for the compressor during the non-operation period of the compressor. Therefore, the technology for power saving of the electromagnetic clutch during the operation of the compressor as described above makes sense. do not have.

  Therefore, in view of the fact that the operation period of the compressor as described above is much longer than the non-operation period of the compressor, an object of the present invention relates to a conventional general technique for a power transmission system via an electromagnetic clutch. The idea is reversed, so that when the compressor is in operation, the electromagnetic clutch is de-energized so that the desired power can be transmitted mechanically and automatically, and when the compressor is stopped, the electromagnetic clutch is energized so that the power cutoff state can be maintained. Another object of the present invention is to provide an electromagnetic clutch for a compressor that can greatly reduce the electric power required for the electromagnetic clutch.

  In order to solve the above-mentioned problems, an electromagnetic clutch for a compressor according to the present invention is connected to a rotor connected to the power source side and a compressor drive shaft side, and comes into contact with the rotor side. The armature that can transmit power from the compressor side to the compressor drive shaft side, and the operation control in the direction in which the relative positions of the rotor side and the armature side are brought into contact with each other and the directions in which they are separated from each other through excitation control An electromagnetic clutch for a compressor comprising an electromagnetic coil, wherein the electromagnetic coil is provided with a biasing means for constantly biasing a contact portion of the rotor side to the armature side toward the armature side with a predetermined biasing force. Is set to a direction in which the abutting portion of the rotor side to the armature side is separated from the armature side, and the electromagnetic coil of the direction to be separated is set. Consisting of those wherein the actuating force by magnetic set larger than the predetermined force of the force of the biasing means.

  In such a compressor electromagnetic clutch, when power is transmitted to the compressor drive shaft side for compressor operation, the electromagnetic coil is de-energized and no operating force is generated by the excitation of the coil. The abutting portion of the rotor side on the armature side is urged toward the armature side by the mechanical urging means, and is abutted on the armature side so that predetermined power transmission is performed without exciting the electromagnetic coil. Therefore, at this time, no electric power for the electromagnetic coil is required. On the other hand, when power transmission to the compressor drive shaft side is interrupted in order to keep the compressor stopped, the electromagnetic coil is energized to excite the coil, and an operating force larger than the urging force by the urging means is applied. As a result, the contact portion of the rotor side to the armature side is separated from the armature side and maintained in the separated state. Therefore, at this time, electric power for the electromagnetic coil is required. As described above, generally, the operation period of the compressor is much longer than the non-operation period of the compressor throughout the year, in other words, the non-operation period of the compressor. Is much shorter than the operation period of the compressor, so that it is not necessary to energize the electromagnetic coil during the operation period of the compressor as described above, and energization to the electromagnetic coil is necessary only during the stop period of the compressor. By switching the energization completely opposite to the conventional general technique, the energization power to the electromagnetic coil can be significantly reduced as a result throughout the year.

  In the above-described electromagnetic clutch for a compressor according to the present invention, the contact and separation structure between the rotor side and the armature side can take various forms more specifically. For example, it is possible to employ a structure in which a plurality of friction surface portions that can be brought into contact with and separated from each other are formed between the armature side on the rotor side. In the embodiment described later, power is transmitted and shut off at a total of four friction surface portions. By forming a plurality of friction surface portions in this way, power transmission performance can be amplified substantially corresponding to the number of friction surface portions, stable power transmission can be achieved, and a small friction surface area can be achieved. However, large power can be transmitted.

  Further, as a more specific structure, for example, as shown also in an embodiment described later, the rotor has a plurality of movable portions that are in contact with the armature side, and one of the plurality of movable portions is the above-described one. It can be set as the structure comprised so that the urging | biasing force by an urging | biasing means and the operating force by the excitation of the said electromagnetic coil may work directly. That is, the urging force by the urging means and the actuating force due to the excitation of the electromagnetic coil are configured to act on one rotor movable part, and the urging force and actuating force on the one rotor movable part are all necessary parts. Therefore, the desired power transmission state and power cutoff state can be controlled only by controlling the operating force by exciting the electromagnetic coil with respect to the one rotor movable portion. Therefore, the mechanism for controlling the power transmission state and the power cutoff state can be simplified.

  The biasing means that satisfies the above-described function can be easily configured from, for example, a spring means that can exhibit a predetermined biasing force. In particular, by configuring the spring means from a disc spring, the spring means installation portion can be configured compactly, and the structure of the portion can be simplified.

  In the compressor electromagnetic clutch according to the present invention, it is preferable that a torque limiter mechanism is provided between the armature and the compressor drive shaft. In the present invention, during operation of the compressor, the rotor side and the armature side are brought into contact with each other only by the urging force of the mechanical urging means, and the power is transmitted to the compressor drive shaft. By providing a torque limiter mechanism, even if the load on the compressor side becomes excessive, the torque limiter mechanism can be operated to properly cut off power transmission and protect the compressor. It becomes possible.

  Further, in the electromagnetic clutch for a compressor according to the present invention, a large current for obtaining a relatively large magnetomotive force and a small magnetomotive force are obtained as an energization current to the electromagnetic coil for exciting the electromagnetic coil. Therefore, a structure having current switching means for switching to a small current can be employed. By providing such a current switching means, the power consumption can be further greatly reduced. That is, as described above, in the present invention, when power is transmitted for compressor operation, the rotor side and the armature side are in contact with each other, and the rotor movable portion and the rotor movable portion are separated from the armature side. An air gap exists between the electromagnetic coil attracting portion for separating the air coil. This air gap becomes a magnetic resistance when the rotor movable part is attracted to the attracting part of the electromagnetic coil. Therefore, if a relatively large air gap still exists at the start of the suction, the rotor movable part is attracted. Therefore, a large magnetomotive force is required for the electromagnetic coil. On the other hand, in the state where the power is cut off because the compressor is stopped, the suction of the rotor movable portion to the electromagnetic coil suction portion has already been completed, so the air gap in the suction surface portion becomes very small or substantially It becomes non-existent and the magnetic resistance is also reduced. Therefore, in maintaining the power shut-off state, a large magnetomotive force is not necessary, and a relatively small magnetomotive force may be maintained. In consideration of such conditions, the current switching means is used to obtain a relatively large magnetomotive force on the electromagnetic coil only at the start of adsorption to the electromagnetic coil adsorption part of the rotor movable part at the start of power transmission interruption. When a large current is applied and the power shut-off state is maintained after the end of the operation, the time for supplying a large current is extremely shortened by switching control so that a small current is always applied to obtain a relatively small magnetomotive force. As a result, the power consumption of the electromagnetic coil can be further greatly reduced.

  As the current switching means, for example, means for controlling the supply voltage to the electromagnetic coil (for example, PMW control means) can be adopted, or the electromagnetic coil is composed of a plurality of coils connected in parallel. The current switching means may comprise means for switching the number of energized coils, and the combined resistance of the coils may be changed by switching the number of energized coils, thereby changing the current flowing through the circuit. it can.

  In the present invention, when the power is cut off to stop the compressor, it is only necessary to maintain the adsorption state of the rotor movable portion to the electromagnetic coil adsorption portion, and to maintain the adsorption state. In addition, since the current value required for the electromagnetic coil does not fluctuate, the current control in this state does not require complicated control like the current control of the excitation clutch during the operation of the conventional compressor.

  The electromagnetic clutch for a compressor according to the present invention can be applied to any compressor that controls transmission and interruption of power using the electromagnetic clutch, and can also be incorporated into a variable capacity compressor. Among these, it is optimum to be incorporated in a compressor for refrigerant compression used in a refrigeration circuit. With variable displacement compressors that can variably control their own capacity with a capacity control valve, etc., the refrigeration capacity can be controlled by the compressor itself, so there is almost no need for clutch cycling during compressor operation, and electromagnetic clutches are always active except in winter. Since the power transmission state is sufficient, the application of the electromagnetic clutch for a compressor according to the present invention is suitable.

  Furthermore, the electromagnetic clutch for a compressor according to the present invention is particularly optimal when incorporated in a compressor used in a vehicle air conditioner. As described above, in the refrigeration circuit of the vehicle air conditioner, since the compressor operation period is about three times the non-operation period throughout the year, it is unnecessary to energize the electromagnetic clutch during the compressor operation period. Significant power saving is achieved.

  Thus, according to the electromagnetic clutch for a compressor according to the present invention, it is unnecessary to energize the electromagnetic clutch when transmitting power to the compressor having a long period, and the electromagnetic clutch is used only when the power to the compressor having a short period is cut off. Since power is supplied, the electric power required for the electromagnetic clutch for controlling transmission and disconnection of power can be greatly reduced throughout the year, resulting in a significant power saving effect.

  Further, if the current flowing through the electromagnetic clutch is switched between a magnitude when the power is cut off to the compressor and a time when the cutoff is maintained, a greater power saving effect can be obtained.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an electromagnetic clutch for a compressor according to an embodiment of the present invention. In FIG. 1, an electromagnetic clutch 1 for a compressor is connected to a rotor 2 connected to a power source (for example, an engine of a vehicle, not shown) and a compressor drive shaft 3 side. The armature 4 that can transmit power from the power source side to the compressor drive shaft 3 side by contact, and the direction in which the relative positions of the rotor 2 side and armature 4 side abut against each other via excitation control And an electromagnetic coil 5 that can be controlled in operation. In this embodiment, the electromagnetic coil 5 is composed of two coils 5a and 5b connected in parallel to each other. As described later, when the separation between the rotor 2 side and the armature 4 side starts and when the separation state is maintained. Correspondingly, the number of energized coils can be switched by the current switching means. Further, in this embodiment, a torque limiter mechanism 6 is provided between the armature 4 and the compressor drive shaft 3, and the power transmission is cut off when the load on the compressor side becomes excessive, so that the compressor It can be protected.

  On the rotor 2 side, a disc spring 7 is provided as a biasing means for constantly biasing a contact portion of the rotor 2 side to the armature 4 side toward the armature 4 side with a predetermined biasing force. The operation direction at the time of exciting the coil 5 is set to a direction in which the contact portion of the rotor 2 side to the armature 4 side is separated from the armature 4 side (the contact direction is the direction of the arrow 8 in FIG. The actuating force due to the excitation of the electromagnetic coil 5 in the separating direction is set to be larger than the predetermined energizing force by the disc spring 7 as the energizing means.

  More specifically, in the present embodiment, the rotor 2 includes the friction plates 10 and 11 as a rotor movable portion provided so as to be movable and movable in the axial direction of the fixing bolt 9, and a child pair substantially with the fixing bolt 9. The friction plate 12 is provided. The armature 4 has two armature plates 13 and 14 made of an annular plate. And, there are a total of four locations between the friction plate 10 and the armature plate 13, between the friction plate 11 and the armature plate 13, between the friction plate 11 and the armature plate 14, and between the friction plate 12 and the armature plate 14. The friction surface 15 is formed so that the friction surfaces can be brought into contact with and separated from each other. Further, in these friction surface portions 15, friction liners 16 are provided on both sides of the armature plate 13 and both sides of the armature plate 14, respectively, to prevent sticking (burn-in), improve power transmission performance, and armature during power shutoff Prevents interference of the plate. In FIG. 2, the electromagnetic coil 5 is not energized, and the biasing force in the direction of arrow 8 by the disc spring 7 directly acts on the friction plate 10 as a rotor movable portion, and the four friction surface portions 15 are applied by the biasing force. In this state, all the friction surfaces are in contact with each other. In this state, the surface on the friction plate 10 side of the rotor main body 17 housing the disc spring 7 and the friction plate 10 facing it. An air gap 18 exists between the surfaces.

The operation of the electromagnetic clutch 1 for a compressor constructed as described above is schematically illustrated in FIG. 3 (only the friction plates 10 and 12 are illustrated as friction plates on the rotor 2 side for easy understanding). This will be explained with reference to In addition, the meaning of the code | symbol used in the following description is as follows.
Fe: Mechanical pressing force by urging means (at air gap Max)
Ff: Mechanical pressing force by urging means (when air gap is zero)
Fg: Electromagnetic adsorption force (at air gap Max)
Fh: Electromagnetic adsorption force (when air gap is zero)
μc: Friction coefficient between friction surfaces in the friction surface portion Rb: Radius of friction surfaces (average radius)
Tb: Compressor load torque

First, as shown in FIG. 3A, at the time of power transmission, the friction plate 10 is urged by the spring 7 and the friction plates of the rotor 2 and the armature 4 are brought into contact with each other to press the friction surface necessary for power transmission. The force is mechanically secured by the spring compression force. At this time, as shown in the following equation, it is necessary that the transmittable torque (Fe · μc · Rb) by the friction surface portion is larger than the compressor load torque (Tb).
Fe · μc · Rb> Tb
At this time, it is not necessary to energize the electromagnetic coil 5, and as described above, when the rotor 2 and the armature 4 are in contact with each other and the compressor is driven for a long period of time, the electromagnetic coil 5 is not energized. A large power saving effect can be obtained.

  When driving of the compressor becomes unnecessary and power transmission is interrupted, as shown in FIG. 3B, the electromagnetic coil 5 is energized, and the adsorption force (Fg) equal to or higher than the mechanical pressing force in the air gap Max state. ) Is ensured electromagnetically. That is, the electromagnetic coil 5 is energized so as to satisfy Fe <Fg. With this attracting force (Fg), the friction plate 10 of the rotor 2 overcomes the compressive force of the spring 7 and is attracted to the electromagnetic coil 5 side, power transmission is interrupted, and eventually the air gap is zero as shown in FIG. It becomes the state of. In this state where the air gap is zero, the friction plate 10 only needs to be held at the suction position, and a large suction force that moves the friction plate 10 is unnecessary. Should be maintained. That is, the electromagnetic coil 5 may be energized so as to satisfy Ff <Fh. In other words, the electromagnetic attraction force Fh at the time of adsorption maintenance is smaller than the electromagnetic attraction force Fg at the start of adsorption, and the energization current is compared with the energization current to the electromagnetic coil 5 for generating Fg. The energization current to the electromagnetic coil 5 for generating Fh can be small.

In the present embodiment shown in FIG. 2, since there are a plurality of friction surface portions (four locations), the transmission torque T is amplified by the number n of the friction surface portions (four times in this embodiment). That is, the transmission torque T can be expressed by the following equation.
T = Fe · μc · Rb · n = Fe · μc · Rb × 4

  Further, when controlling the change of the electromagnetic adsorption force, as described above, the energization current to the electromagnetic coil 5 at the time of starting the adsorption of the friction plate 10 is controlled to a relatively large current, and the electromagnetic coil 5 when maintaining the adsorption is controlled. Control of the energization current to a relatively small current can be performed, for example, as follows.

  For example, as shown in the electric circuit diagram of FIG. 4, when the electromagnetic coil 5 is composed of one coil, there is a relationship of V = IR (I is a flowing current value) between the supply voltage V and the resistance R of the coil. If the supply voltage V is constant, a current I corresponding to the coil resistance R flows. Therefore, the current I can be controlled by changing the supply voltage V. The supply voltage V can be controlled by, for example, PWM control (Pulse Width Modulation).

  When the electromagnetic coil 5 is composed of two coils 5a and 5b as in this embodiment, the current I can be changed and controlled by switching the number of energized coils by the operation of the switch 21 as shown in FIG. At the start of suction of the friction plate 10, the switch 21 is closed as shown in FIG. 5A, and both the coils 5a and 5b are energized. At this time, the current Ia flowing through the coil 5a is Ia = V / Ra, and the current Ib flowing through the coil 5b is Ib = V / Rb. Since the coils 5a and 5b are connected in parallel, the current I flowing through the electromagnetic coil 5 is I = Ia + Ib, and a relatively large current can flow. When maintaining the suction state of the friction plate 10, the switch 21 is opened as shown in FIG. 5B, and only the coil 5a is energized. At this time, the current Ia flowing through the coil 5a is Ia = V / Ra, and the current I flowing through the electromagnetic coil 5 is also the same, and can be switched to a relatively small current. Therefore, switching control between a large current and a small current can be performed simply by switching, and the power consumption during the power transmission interruption period can be reduced by reducing the current when the friction plate 10 is maintained in the attracted state.

  Various modifications can be made to the above embodiment. For example, as shown in FIG. 6, the rotor body 17 is provided with an extending portion 31 extending in the direction of the friction plate 12, and the friction plate 12 is fixed to the rotor body 17 via a fixing bolt 32. The fixing strength of the friction plate 12 can be improved, and the anti-rotation strength of the friction plate 12 with respect to the rotor body 17 can be improved.

  Further, for example, as shown in FIG. 7, a plurality of coil springs 41 are provided instead of the disc spring 7 in the above embodiment, and a plurality of these coil springs 41 are arranged at an appropriate pitch in the circumferential direction of the rotor body 17. It can also be set as the structure made to do. By adopting such a plurality of coil springs 41, it is possible to improve the stability of the spring characteristics as the urging means.

  Furthermore, in the above embodiment, the magnetic flux path formed between the rotor body 17 and the rotor friction plate 10 is a so-called single flux specification (in this case, the magnetic flux path is a slit on the rotor body 17 side). 8), the rotor friction plate 51 is also slit as shown in FIG. 8, for example. 52, and by appropriately adjusting the arrangement positions of the slit 54 and the slit 55 (slit 55 also serving as the spring 56 arrangement portion) on the rotor main body 53 side on both sides of the slit 52, a so-called double flux specification (in this case, magnetic The path of the flux is slit from one side of one slit 54 on the rotor body 53 side via one side of the slit 52 of the rotor friction plate 51. Returning to 4,55 between sites, back to the other side of the slit 55 via the other side of the slit 52 of rotor friction plates 51 from which it can be configured to flux specification) as the two folded path. In the form shown in FIG. 8, the size of the electromagnetic coil 57 is expanded together with the double flux specification. Since the magnetic flux can be increased by adopting the double flux specification in this way, the number of friction surface portions can be reduced as shown in FIG. 8 even when the same power transmission performance is obtained. (In the example shown in the figure, the number is reduced from the above-mentioned four places to two places), and the number of parts in the friction surface portion can be reduced.

  The electromagnetic clutch for a compressor according to the present invention can be applied to any compressor using a rotor / armature type electromagnetic clutch, and is particularly suitable for a compressor for refrigerant compression, particularly a compressor for a vehicle air conditioner.

It is a longitudinal cross-sectional view of the electromagnetic clutch for compressors which concerns on one embodiment of this invention. FIG. 2 is a partially enlarged cross-sectional view of the apparatus of FIG. FIG. 2 is a schematic operation explanatory diagram of the apparatus of FIG. 1. It is a circuit diagram in case an electromagnetic coil has one coil in this invention. In this invention, it is a circuit diagram in case an electromagnetic coil has two coils, and shows the case where it supplies with electricity to two coils (A), and the case where it supplies with electricity to only one coil (B). It is sectional drawing of the electromagnetic clutch for compressors which shows the modification of the form shown in FIG. It is sectional drawing of the electromagnetic clutch for compressors which shows another modification of the form shown in FIG. It is sectional drawing of the electromagnetic clutch for compressors which shows another modification of the form shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 2 compressor 3 Rotor 3 Compressor drive shaft 4 Armature 5 Electromagnetic coil 5a, 5b Coil 6 Torque limiter mechanism 7 Belleville spring 9 as urging means Fixing bolts 10, 11, 12 Friction plates 13, 14 Armature plate 15 Friction surface portion 16 Friction liner 17 Rotor body 18 Air gap 21 Switch 31 Extension portion 32 Fixing bolt 41 Coil spring 51 Rotor friction plate 52 Slit 53 Rotor body 54, 55 Slit 56 Spring 57 Electromagnetic coil

Claims (12)

  A rotor connected to the power source side, an armature connected to the compressor drive shaft side, and capable of transmitting power from the power source side to the compressor drive shaft side by abutting with the rotor side, and excitation An electromagnetic clutch for a compressor, comprising: an electromagnetic coil that can be controlled to operate in a direction in which the relative positions of the rotor side and the armature side are brought into contact with each other and away from each other through control. A biasing means for constantly biasing the abutting portion to the armature side toward the armature side with a predetermined biasing force, and setting the operating direction during excitation of the electromagnetic coil to the armature side abutting portion of the rotor side Is set in a direction in which the armature is separated from the armature side, and an operating force by the excitation of the electromagnetic coil in the direction in which the armature is separated is larger than the predetermined urging force by the urging means. An electromagnetic clutch for a compressor, characterized in that the set.   2. The electromagnetic clutch for a compressor according to claim 1, wherein a plurality of friction surface portions are formed between the rotor side and the armature side so that the friction surfaces can be brought into contact with and separated from each other.   The rotor has a plurality of movable parts abutted on the armature side, and one of the plurality of movable parts is directly operated by an urging force by the urging means and an operating force by excitation of the electromagnetic coil. The electromagnetic clutch for a compressor according to claim 1 or 2, wherein the electromagnetic clutch is configured.   The electromagnetic clutch for a compressor according to any one of claims 1 to 3, wherein the urging means comprises spring means.   The electromagnetic clutch for a compressor according to claim 4, wherein the spring means comprises a disc spring.   The electromagnetic clutch for a compressor according to any one of claims 1 to 5, wherein a torque limiter mechanism is provided between the armature and the compressor drive shaft.   A current switching means for switching an energization current to the electromagnetic coil between a large current for obtaining a relatively large magnetomotive force and a small current for obtaining a small magnetomotive force for exciting the electromagnetic coil; The electromagnetic clutch for a compressor according to any one of claims 1 to 6.   The electromagnetic clutch for a compressor according to claim 7, wherein the current switching unit includes a unit that controls a supply voltage to the electromagnetic coil.   The electromagnetic clutch for a compressor according to claim 7, wherein the electromagnetic coil includes a plurality of coils connected in parallel, and the current switching unit includes a unit that switches the number of energized coils.   The electromagnetic clutch for a compressor according to any one of claims 1 to 9, which is incorporated in a variable capacity compressor.   The electromagnetic clutch for compressors in any one of Claims 1-10 incorporated in the compressor for refrigerant | coolant compression used for a refrigerating circuit.   The electromagnetic clutch for compressors in any one of Claims 1-11 incorporated in the compressor used for a vehicle air conditioner.

Images