JP2018080830A - Control device to electromagnetic clutch of gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress sudden application of load to a power source for driving an electromagnetic clutch.SOLUTION: A control device 200 includes a power supply portion 230, a reception portion 210 and an energization control portion 220, and the energization control portion 220 controls the power supply portion 230 so that when a signal is input from the reception portion 210 (1), electric current of a first electric current value I1 to bring an armature 94 into contact with a rotor 92 flows to an electromagnetic coil 93, in at least a partial period from the contact of the armature 94 with the rotor 92 to reaching a connection state to integrally rotate the armature and the rotor (2), electric current of a second electric current value I2 lower than the electric current value flowing to the electromagnetic coil 93 in a case of keeping the voltage applied to the electromagnetic coil 93 in (1), and making a clutch frictional torque over a compressor torque, flows to the electromagnetic coil 93, and after the connection state (3), electric current of a third electric current value I3 over the second electric current value I2 in the partial period of (2), flows to the electromagnetic coil 93.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control device for an electromagnetic clutch of a gas compressor.

  A gas compressor of an air conditioning system (hereinafter referred to as an air conditioning system) mounted on a vehicle or the like operates by receiving power from a power source (such as an engine) of the vehicle or the like. In this case, an electromagnetic clutch is used to connect and disconnect the power supply from the power source. The electromagnetic clutch includes a rotor, an electromagnetic coil, and an armature. The rotor always rotates under the power of the power source, and the armature is connected to the rotating shaft of the gas compressor.

  The armature does not rotate because it is separated from the rotating rotor by a certain gap, but when the electromagnetic coil generates a magnetic force by energization, the armature is attracted to the rotor by the magnetic force and connected. As a result, the armature rotates integrally with the rotor, and the rotating shaft connected to the armature rotates. Note that an elastic force such as a spring member acts on the armature, and when the electromagnetic coil is de-energized, there is no magnetic force to attract the armature, and the armature is returned to a state separated from the rotor by this elastic force.

  As described above, the electromagnetic clutch is connected to and disconnected from the power source depending on whether or not voltage is applied to the electromagnetic coil. When the armature is connected in contact with the rotor, the power source includes a load of the gas compressor. Takes suddenly. Here, when the power source is an engine, for example, the engine is a drive source for driving the vehicle or the like, and therefore, when a sudden load from the gas compressor is applied, the driving force for driving the vehicle is rapidly reduced. The ride quality of vehicles and the like can be adversely affected. Therefore, on the engine side, it has been proposed to increase the rotational speed of the engine to prevent a decrease in driving force when the gas compressor is started (when coupled with an electromagnetic clutch) (see, for example, Patent Document 1). .

JP, 2006-107951, A

  The technique proposed in the above-mentioned prior art document is a countermeasure on the power source side, but when such a countermeasure is not taken on the power source side, it corresponds on the electromagnetic clutch side of the gas compressor. It is desirable.

  The present invention has been made in view of the above circumstances, and an electromagnetic clutch of a gas compressor capable of suppressing a sudden load on a power source driving the electromagnetic clutch in the gas compressor. An object of the present invention is to provide a control device for the above.

  The present invention relates to an electromagnetic coil in a gas compressor, comprising an electromagnetic coil, a rotor, and an armature that comes into contact with the rotor by energization of the electromagnetic coil and leaves the rotor by stopping energization of the electromagnetic coil. A power supply unit that supplies power to the electromagnetic coil, a reception unit that receives a signal of an instruction to supply the power to the electromagnetic coil, and an energization control unit that controls the power supplied to the electromagnetic coil, When the signal is input from the reception unit, the energization control unit (1) generates a voltage at which a current having a first current value required to bring the armature into contact with the rotor flows through the electromagnetic coil. (2) After the armature contacts the rotor, the armature and the rotor are integrated with each other. In at least a part of the period until reaching the rotating connection state, the voltage applied to the electromagnetic coil in (1) is lower than the current value flowing in the electromagnetic coil and the clutch friction torque is (1) controls the power supply unit so as to change the voltage application method so that a current having a second current value exceeding the compressor torque flows through the electromagnetic coil, and (3) the connection After the state, the power supply unit is controlled so that a current having a third current value exceeding the second current value in the partial period flows through the electromagnetic coil. It is a control device.

  According to the control apparatus for an electromagnetic clutch of a gas compressor according to the present invention, it is possible to suppress a load from being suddenly applied to a power source driving the electromagnetic clutch in the gas compressor.

It is a block diagram which shows one Embodiment of the control apparatus with respect to the electromagnetic clutch of the gas compressor which concerns on this invention. It is sectional drawing which shows the vane rotary type compressor which is one Example of the target gas compressor controlled by the control apparatus shown in FIG. FIG. 2 is a diagram showing a time passage of current flowing through an electromagnetic coil controlled by the control device shown in FIG. 1 and showing a clutch friction torque and a compressor torque in a corresponding time passage. It is a diagram which shows the time course of the current which flowed through the electromagnetic coil which is the conventional example which is a comparative example, and shows the clutch friction torque and compressor torque in the corresponding time course. It is a figure which shows an example of the change of the voltage which the electricity supply control part applied to the electromagnetic coil in order to flow the electric current of the change shown in FIG. It is a figure which shows another example (the 1) of the change of the voltage which an electricity supply control part applies to an electromagnetic coil. It is a figure which shows another example (the 2) of the change of the voltage which an electricity supply control part applies to an electromagnetic coil. It is a figure which shows another example (the 3) of the change of the voltage which an electricity supply control part applies to an electromagnetic coil.

  Embodiments of a control device for an electromagnetic clutch of a gas compressor according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a control device 200 which is an embodiment of a control device for an electromagnetic clutch of a gas compressor according to the present invention. FIG. 2 is a cross-sectional view showing a vane rotary type compressor 100 which is an embodiment of a target gas compressor controlled by the control device 200 shown in FIG.

<Compressor>
A compressor 100 shown in FIG. 2 is mounted on a vehicle and is configured as a part of an air conditioning system (hereinafter simply referred to as an air conditioning system) that performs cooling using the heat of vaporization of a cooling medium. A condenser, an expansion valve, an evaporator, and the like, which are constituent elements of the above, are provided on the cooling medium circulation path.

  The compressor 100 compresses the refrigerant gas G (gas) as a gaseous cooling medium taken from the evaporator of the air conditioning system, and supplies the compressed refrigerant gas to the condenser of the air conditioning system. The condenser heat-exchanges the compressed refrigerant gas with ambient air or the like to dissipate heat from the refrigerant gas and liquefy it, and sends it to the expansion valve as a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is reduced in pressure by the expansion valve and sent to the evaporator. The low-pressure liquid refrigerant absorbs heat from the surrounding air and vaporizes in the evaporator, and cools the air around the evaporator by heat exchange accompanying the vaporization of the refrigerant. The vaporized low-pressure refrigerant gas G returns to the compressor 100 and is compressed, and the above process is repeated thereafter.

  As shown in FIG. 2, the compressor 100 includes a compression mechanism 60 that sucks low-pressure refrigerant gas G into the interior, compresses and discharges the refrigerant gas G to high pressure, a housing 10 that houses the compression mechanism 60, and a compression mechanism. And an electromagnetic clutch 90 for connecting and disconnecting power supply from an external power source for driving the unit 60.

  The housing 10 includes a case 11 whose one end is closed and a front head 12 which covers the opened end of the case 11. A space for accommodating the compression mechanism 60 is formed inside the housing 10 with the front head 12 covering the end of the case 11. The compression mechanism section 60 has a rotating shaft 51 lubricated with the refrigerating machine oil R. When the rotating shaft 51 rotates, the low-pressure refrigerant gas G is sucked into the interior, compressed to a high pressure, and discharged to the outside. To do.

  Here, one end 51 a of the rotating shaft 51 is exposed to the outside of the housing 10. Specifically, in the state shown in FIG. 2, the left end 51 a of the rotating shaft is exposed to the outside of the front head 12.

<Electromagnetic clutch>
The electromagnetic clutch 90 includes a pulley 91, a rotor 92, an electromagnetic coil 93, and an armature 94. As shown in FIG. 2, the pulley 91 has a belt wound around an outer peripheral surface 91a in which a plurality of grooves each having a V-shaped cross section along the circumferential direction are formed. This belt is supplied with power from an engine (an example of a power source) of a vehicle on which the compressor 100 is mounted.

  The rotor 92 is fixed to the front head 12 via a radial bearing, and is rotatable about the rotation axis C. The rotor 92 is formed with a cylindrical coil housing space, and a cylindrical electromagnetic coil 93 is housed in the coil housing space. The rotor 92 is integrated with the pulley 91. Therefore, when the pulley 91 is supplied with power from the engine or the like, the pulley 91 and the rotor 92 rotate about the axis C as a unit.

  The electromagnetic coil 93 is fixed to the front head 12 via a yoke, does not rotate around the axis C, generates a magnetic force when energized, and disappears when the energization is stopped. The armature 94 includes an inner ring 94b, an outer ring 94a, and a leaf spring 94c. The inner ring 94 b is fastened by a screw 70 to the end 51 a of the rotating shaft 51 exposed from the front head 12.

  The outer ring 94a is arranged to project outward in the radial direction from the inner ring 94b, and is formed of a material having a high friction coefficient. The leaf spring 94c connects the inner ring 94b and the outer ring 94a, and the outer ring 94a is displaced with respect to the inner ring 94b by elastic deformation of the leaf spring 94c along the direction in which the axis C extends. It can be done.

  The outer ring 94a is disposed through a slight gap from the side wall surface of the rotor 92 that is orthogonal to the axis C, but when a magnetic force is generated by energizing the electromagnetic coil 93, the magnetic force of the leaf spring 94c is increased. The electromagnetic coil 93 is attracted against the elastic force. When the outer ring 94a is displaced by this suction until the gap disappears (suction completion state), the outer ring 94a contacts the side wall surface of the rotor 92. After contact between the outer ring 94a and the side wall surface of the rotor 92, the armature 94 starts to rotate with the rotating rotor 92 due to an increase in frictional force (dynamic friction torque).

  As the dynamic friction torque between the outer ring 94a and the side wall surface of the rotor 92 increases, the speed difference (torque difference) between the outer ring 94a and the rotor 92 decreases, and eventually the speed difference becomes zero and the two rotate synchronously. (Concatenation completed). Thereby, the compression mechanism 60 of the compressor 100 in which the rotary shaft 51 is connected to the armature 94 is driven.

  On the other hand, when the energization to the electromagnetic coil 93 is stopped, the magnetic force generated by the electromagnetic coil 93 disappears. As a result, the outer ring 94a that has been in contact with the side wall surface of the rotor 92 is caused by the elastic force of the leaf spring 94c. The rotor 92 is returned to the original position away from the side wall surface. Thereby, the armature 94 stops and the compression mechanism part 60 of the compressor 100 also stops.

<Control device>
Next, the control device 200 that controls the power supplied to the electromagnetic coil 93 will be described. The control device 200 is configured separately from the compressor 100, but may be configured as a part of the compressor 100. As shown in FIG. 1, the control device 200 supplies a power supply unit 230 that supplies power to the electromagnetic coil 93, a reception unit 210 that receives an instruction signal S for supplying power to the electromagnetic coil 93, and supplies the electromagnetic coil 93. And an energization control unit 220 that controls the power to be generated.

  Here, the power supply unit 230 relays power supplied from a power source (such as an in-vehicle battery) of a vehicle in which the control device 200 is mounted together with the compressor 100. The accepting unit 210 accepts an operation start instruction signal input to a switch or the like provided on the vehicle for operating the air conditioner as an instruction signal S for supplying electric power to the electromagnetic coil 93.

  FIG. 3 shows the time lapse of the current I flowing through the electromagnetic coil 93 controlled by the control device 200, and the clutch friction torque (rotor 92 torque) and compressor torque (armature 94 torque) in the corresponding time lapse. FIG. 4 is a diagram showing the time passage of the current flowing through the electromagnetic coil, which is a comparative example, and a diagram showing the clutch friction torque and the compressor torque in the corresponding time passage, FIG. FIG. 5 is a diagram illustrating an example of a change in voltage applied to the electromagnetic coil 93 by the energization control unit 220 in order to flow the change current shown in FIG. 4.

  The energization control unit 220 controls the power supplied to the electromagnetic coil 93 as follows. (1) The power supply unit 230 is controlled so as to apply a voltage such that a current having a first current value I1 required to bring the armature 94 into contact with the rotor 92 flows through the electromagnetic coil 93, and (2) the armature 94 When the voltage applied to the electromagnetic coil 93 in the above (1) is maintained for at least a part of the period after contacting the rotor 92 until reaching the connected state where the armature 94 and the rotor 92 rotate integrally. The second current value is lower than the current value flowing through the electromagnetic coil 93 and the clutch friction torque exceeds the compressor torque, that is, necessary to reach a connected state in which the armature 94 and the rotor 92 rotate together. The power supply unit changes the voltage application method from (1) so that the current of the second current value I2 flows through the electromagnetic coil 93. 30 and (3) after the armature 94 and the rotor 92 are connected to rotate integrally, the third current value I3 exceeding the second current value I2 in a partial period of (2) The power supply unit 230 is controlled so that a current flows through the electromagnetic coil 93.

  Specifically, the energization control unit 220 (1) has a constant voltage applied to the electromagnetic coil 93 so that a current having a first current value I1 necessary for bringing the armature 94 into contact with the rotor 92 flows through the electromagnetic coil 93. The power supply unit 230 is controlled so as to continuously apply the voltage V having the value V1. Thus, when the voltage V of the constant voltage value V1 is continuously applied to the electromagnetic coil 93, the upper diagram of FIG. 3 (range of (1) ((electromagnetic clutch) start-up (armature) suction completion)) As shown in FIG. 4, even if the current value I1 of the current flowing through the electromagnetic coil 93 increases with time, and the applied voltage V is a constant voltage value V1, the inductance change of the electromagnetic coil 93 changes. As a result, the current value I1 of the flowing current decreases. The state of completion of suction of the armature 94 is a state in which the armature 94 starts to contact the rotor 92 and a state in which contact has begun. Note that the control in the range of (1) is the same as the conventional one (see the comparative example in FIG. 4).

  Here, when the state in which the constant voltage value V1 is continuously applied as in the comparative example is maintained and the method of applying the voltage is not changed, the current value of the current flowing through the electromagnetic coil 93 when the armature 94 is completely attracted. As shown in FIG. 4, the value of the current flowing through the electromagnetic coil 93 starts to increase after the suction is completed.

  On the other hand, in this embodiment, after the armature 94 is completely sucked, the energization control unit 220 (2) after the armature 94 contacts the rotor 92, the armature 94 and the rotor 92 rotate integrally. In at least a part of the period until the connected state is reached (in this example, the entire period), when the constant voltage (voltage value V1) applied to the electromagnetic coil 93 in (1) is maintained, the electromagnetic coil 93 flows. The current value is lower than the current value (the current value in the range after completion of suction in FIG. 4) (comparison with the current value corresponding to the elapsed time from the start at the same timing. The same applies hereinafter), and the clutch friction torque is the compressor torque. A second current value I2 that exceeds the first current value I2, that is, the second current value I required to reach a connected state in which the armature 94 and the rotor 92 rotate together. Current to flow in the electromagnetic coil 93 of, how multiplying the voltage applied to the electromagnetic coil 93 to change the above (1), controls the power supply unit 230.

  Specifically, as shown in FIG. 5, for example, the power supply unit 230 applies a voltage V having a constant second voltage value V2 lower than the constant first voltage value V1 multiplied in (1) above. To control. In this way, when a certain voltage V is applied to the electromagnetic coil 93, the upper diagram of FIG. 3 (the range from (2) ((armature) suction completion) to (completion of the armature and rotor) connection) As shown in (All period), the difference between the number of revolutions of the armature 94 and the number of revolutions of the rotor 92 is reduced by gradually increasing the current flowing through the electromagnetic coil 93 from a low state as time passes. Eventually, the armature 94 and the rotor 92 rotate (synchronize) together.

  The control in the range of (2) is different from the conventional control (see the comparative example in FIG. 4). In the comparative example shown in FIG. 4, even in the range (2), the state where the voltage V of the constant voltage value V1 applied in the range (1) is applied is continuously maintained until after the armature is connected. Therefore, the method of applying the voltage V is not changed in the range of (2).

  Further, the method of applying the voltage V in the range of (2) is not limited to the form of applying a constant voltage V having a voltage value V2 lower than the voltage value V1, as shown in FIG. That is, as a result, the current value I2 of the current flowing through the electromagnetic coil 93 in the range (2) is continuously applied in the range (2) by the voltage applied to the electromagnetic coil 93 in the range (1). In this case (comparative example), it is only necessary to control the supply of electric power so as to be lower than the current value of the current flowing through the electromagnetic coil 93 (current value in the range after completion of sucking in FIG. 4).

  Therefore, for example, the voltage V having a constant voltage value V1 continuously applied to the electromagnetic coil 93 in the range (1) is applied in a pulsed manner by PWM control in the range (2), and the duty ratio of application is 100. By making the value smaller than [%], the current value I2 of the current flowing through the electromagnetic coil 93 in the range (2) is obtained, and the voltage applied to the electromagnetic coil 93 in the range (1) is (2). Even if it is continuously applied in the range, the current value of the current flowing through the electromagnetic coil 93 may be lowered.

  In the present embodiment, the second current value I2, which is the current flowing through the electromagnetic coil 93 in the range (2) (at least in part), is the voltage applied to the electromagnetic coil 93 in the range (1). Although it is smaller than the minimum value of the current flowing through the electromagnetic coil 93 when continuously applied even within the range of (2) (current value at the time of completion of suction shown in FIG. 4), in the present invention, The second current value I2, which is a current flowing through the electromagnetic coil 93 in the range (at least in a part period), does not necessarily need to be less than the minimum value, and is applied to the electromagnetic coil 93 in at least the range of (1). When the voltage is continuously applied even in the range (2), it may be lower than the current value of the current flowing through the electromagnetic coil 93 (the current value in the range after the completion of drinking in FIG. 4). However, it is necessary that the armature 94 in a state where the suction has been completed be equal to or more than a current value that generates a magnetic force that does not leave the rotor 92.

  The timing at which the armature 94 is completely sucked can be detected by monitoring the current flowing through the electromagnetic coil 93 with a sensor or the like. That is, at the timing when the armature 94 is completely sucked, the value of the current flowing through the electromagnetic coil 93 is minimized as described above. Therefore, the timing at which the armature 94 is completely sucked can be strictly detected by detecting the timing at which the current value is minimized by a sensor such as a current sensor. It should be noted that the current value flowing through the electromagnetic coil 93 may be regarded as the timing at which the armature 94 has been suctioned after a certain time has passed without being monitored.

  That is, in a specific type of compressor, the dimension of the gap between the armature and the rotor and the first voltage value of the applied voltage are always constant. Can be obtained in advance through experiments or the like. Therefore, the timing at which the value of the current flowing through the electromagnetic coil becomes minimum can be associated with the elapsed time from the start of the electromagnetic clutch. The energization control unit 220 stores the elapsed time from the start of the electromagnetic clutch so determined, and the energization control unit 220 indicates the time when the stored elapsed time has elapsed since the start of the electromagnetic clutch. By making the determination by measuring the time with the provided timer, the time when the stored elapsed time has passed can be set as the timing when the armature 94 has been sucked without using the sensor.

  The timing obtained in this manner may be used as the timing for switching the method of applying the voltage applied to the electromagnetic coil 93 (timing for switching between the range (1) and the range (2)).

  After the armature 94 is completely connected to the rotor 92, the energization control unit 220 (3) after the armature 94 and the rotor 92 are integrally connected to rotate, the second current value in (2). The power supply unit 230 is configured to continuously apply the same constant voltage V as the first voltage value V1 to the electromagnetic coil 93 so that the current having the third current value I3 exceeding I2 flows through the electromagnetic coil 93. Control. In this way, when the voltage V of the constant voltage value V1 is applied to the electromagnetic coil 93, as shown in the upper diagram of FIG. 3 (the range of (3) (after completion of the connection of (armature and rotor)), The current flowing through the electromagnetic coil 93 increases rapidly, and a current value I3 higher than the current value I2 flowing in the range of (2) flows through the electromagnetic coil 93. The current value I3 flowing in the electromagnetic coil 93 in the range (3) is equal to or greater than the current value I1 flowing in the range (1).

  Note that the timing at which the connection between the armature 94 and the rotor 92 is completed may be associated with the elapsed time by an experiment or the like in advance, similarly to the timing at which the armature 94 is sucked into the rotor 92.

<Action>
According to the compressor 100 configured as described above, the reception unit 210 supplies electric power to the electromagnetic coil 93 with an operation start instruction signal input to a switch or the like that operates an air conditioner provided in the vehicle. It is accepted as an instruction signal S. When receiving the signal S, the receiving unit 210 controls the power supply unit 230 to control power supply to the power supply control unit 220 to start the electromagnetic clutch 90 (supply power to the electromagnetic coil 93). Output a signal.

  In response to the signal output from the receiving unit 210, the energization control unit 220 performs the above-described controls (1), (2), and (3) for the power supply unit 230. The power supply unit 230 applies a constant voltage V to the electromagnetic coil 93 according to the control of the energization control unit 220. As a result, the electromagnetic clutch 90 is activated and the armature 94 starts to contact the rotor 92 in the range of (1) in the upper diagram of FIG. Next, the dynamic friction torque between the armature 94 and the rotor 92 increases in the range of (2) in the upper diagram of FIG. 3, but the current value I2 of the current flowing through the electromagnetic coil 93 is determined when the electromagnetic clutch 90 is started. That is, when the voltage applied to the electromagnetic coil 93 in the range of (1) is continuously applied in the range of (2), it is lower than the current value of the current flowing through the electromagnetic coil 93.

  Accordingly, the dynamic friction between the armature 94 and the rotor 92 is compared with the case where the first voltage value V1 applied when the electromagnetic clutch 90 is started is continuously applied as it is (the comparative example shown in FIG. 4). An increase in torque is suppressed. That is, the time required from when the armature 94 starts to contact the rotor 92 (suction completion) to when the armature 94 and the rotor 92 rotate together (completion of connection) is applied when the electromagnetic clutch 90 is activated. It becomes longer than the comparative example (see FIG. 4) in which the voltage value V1 of 1 is continuously applied. For example, the length is about 3 to 5 times.

  As a result, as shown in the lower diagram of FIG. 3, the clutch friction torque shown in the solid line (torque of the rotor 92) and the one-dot chain line in the range from the completion of suction to the completion of connection (range (2)). The difference from the compressor torque (the torque of the armature 94) can be kept small compared to the comparative example shown in FIG. That is, the control device 200 of the present embodiment can relieve the load at the start of the compressor 100 applied to the engine of the vehicle driving the electromagnetic clutch 90 of the compressor 100, and the load at the start of the compressor 100 is reduced. Suddenly, it is possible to suppress the engine.

  In the range of (3) in the upper diagram of FIG. 3, the electromagnetic current having a current value I3 higher than the current value I2 in the range of (2) and greater than or equal to the current value I1 in the range of (1) flows. Since the coil 93 strengthens the magnetic force acting on the armature 94, even if a torque fluctuation occurs due to a rotation fluctuation of the rotor 92 rotating by the engine, a slip is generated between the armature 94 and the rotor 92. It can be suppressed or prevented. In the present embodiment, the current value I3 flowing through the electromagnetic coil 93 in the range (3) is higher than the current value I1 flowing through the electromagnetic coil 93 in the range (1), but the control device according to the present invention is limited to this. The current value I3 flowing through the electromagnetic coil 93 in the range (3) may be lower or the same as the current value I1 flowing through the electromagnetic coil 93 in the range (1).

  FIG. 6 is a diagram showing another example (No. 1) of a change in voltage applied to the electromagnetic coil 93 by the energization control unit 220, and FIG. FIG. 8 is a diagram illustrating another example (part 3) of a change in voltage applied to the electromagnetic coil 93 by the energization control unit 220.

  In the above-described embodiment, the energization control unit 220 applies the electromagnetic coil 93 to the connected state after the armature 94 is completely attracted (see (2)), for example, as shown in FIG. By applying a voltage (V2 (<V1)) lower than the voltage (voltage value V1) before the completion of suction (range (1)) over the “total period” of (range), The second current value I2 flowing through the electromagnetic coil 93 over the entire period of the range is shown in FIG.

  However, according to the present invention, for example, as shown in FIG. 6, the “partial period” is not the “all period” during the period after the armature 94 is completely sucked until the connected state is reached (range (2)). ”By applying a voltage (V2 (<V1)) lower than the voltage (voltage value V1) before the completion of suction (range (1)), during a partial period of (2) ( In 1), when a constant voltage (voltage value V1) applied to the electromagnetic coil 93 is maintained, the current value flowing through the electromagnetic coil 93 (current value in the range after completion of suction in FIG. 4) is lower and the clutch friction torque The second current value I2 that exceeds the compressor torque, that is, the current of the second current value I2 that is necessary to reach a connected state in which the armature 94 and the rotor 92 rotate integrally flows to the electromagnetic coil 93. In Good.

  In this case, the period other than the partial period may not be lower than the current value flowing through the electromagnetic coil 93 when the constant voltage (voltage value V1) applied to the electromagnetic coil 93 in (1) is maintained. However, it is necessary that the second current value I2 is such that at least the clutch friction torque exceeds the compressor torque.

  Further, according to the present invention, for example, as shown in FIG. 7, after the state where the armature 94 is completely sucked and until the connected state is reached (range (2)) (at least in a part period) May be lower than the voltage (voltage value V1) before the suction is completed (range (1)) to a voltage value V1 (or may exceed the voltage value V1). When the constant voltage (voltage value V1) applied to the electromagnetic coil 93 in (1) is maintained in at least a part of the range of (2), the electromagnetic coil 93 is continuously applied. The second current value I2 that is lower than the current value flowing through the motor (the current value in the range after completion of the suction in FIG. 4) and the clutch friction torque exceeds the compressor torque, that is, the armature 94 and the rotor 92 are integrated. Current of the second current value I2 required to reach the connection state of rolling may also be flowing to the solenoid 93.

  Further, according to the present invention, for example, as shown in FIG. 8, the entire period (range (2)) from the state after the armature 94 is completely sucked until the connected state is reached (range (2)). May be lower than the voltage (voltage value V1) before the suction is completed (range (1)) to a voltage value V1 (or may exceed the voltage value V1). When the constant voltage (voltage value V1) applied to the electromagnetic coil 93 in (1) is maintained in at least a part of the range of (2), the electromagnetic coil 93 is applied in a stepwise manner. The second current value I2 that is lower than the current value flowing through the motor (the current value in the range after completion of the suction in FIG. 4) and the clutch friction torque exceeds the compressor torque, that is, the armature 94 and the rotor 92 are integrated. Current of the second current value I2 required to reach the connection state of rolling may also be flowing to the solenoid 93.

  The compressor 100 of the present embodiment is a vane rotary type gas compressor, but the gas compressor to be controlled by the control device according to the present invention may be a gas compressor provided with an electromagnetic clutch. A gas compressor other than the rotary type may be controlled. Therefore, the control device according to the present invention is also applied to a control device that controls a swash plate type gas compressor, a scroll type gas compressor, or the like other than the vane rotary type.

51 Rotating shaft 90 Electromagnetic clutch 92 Rotor 93 Electromagnetic coil 94 Armature 94a Outer ring 94b Inner ring 94c Leaf spring 100 Compressor 200 Control device 210 Reception unit 220 Energization control unit 230 Power supply unit C Axis center I1 First current value I2 Second Current value I3 third current value S signal V1 first voltage value V2 second voltage value

Claims (4)

For the electromagnetic clutch in the gas compressor, which has an armature that contacts the rotor by energizing the electromagnetic coil, the rotor, and the electromagnetic coil, and has an armature that is separated from the rotor by stopping the energization of the electromagnetic coil.
A power supply unit for supplying power to the electromagnetic coil;
A reception unit that receives a signal of an instruction to supply the power to the electromagnetic coil;
An energization control unit that controls electric power supplied to the electromagnetic coil,
When the signal is input from the reception unit, the energization control unit (1) generates a voltage at which a current having a first current value required to bring the armature into contact with the rotor flows through the electromagnetic coil. And (2) at least a part of a period from when the armature contacts the rotor to when the armature and the rotor reach a connected state in which the armature and the rotor rotate together. When the voltage applied to the electromagnetic coil in (1) is maintained, a current having a second current value that is lower than the current value flowing through the electromagnetic coil and that causes the clutch friction torque to exceed the compressor torque is The power supply unit is controlled so as to change how to apply the voltage to (1) so as to flow through the coil, and (3) after the connection state, Current of the third current value to control the power supply unit to flow in the electromagnetic coil than the second current value in the section period, the control device for the electromagnetic clutch of the gas compressor.   The control device for the electromagnetic clutch of the gas compressor according to claim 1, wherein the third current value is equal to or greater than the first current value.   The timing of switching from the supply of power for flowing the current of the first current value to the supply of power for flowing the current of the second current value to the electromagnetic coil is the current of the first current value. 3. The control device for an electromagnetic clutch of a gas compressor according to claim 1, wherein the timing is after the current value becomes the lowest due to an inductance fluctuation of the electromagnetic coil in a state where the electric current flows through the electromagnetic coil.   The timing of switching from the supply of power for flowing the current of the first current value to the supply of power for flowing the current of the second current value to the electromagnetic coil is the current of the first current value. 3. The gas compression according to claim 1, wherein a time set in advance as a time from when the current value becomes the lowest due to the inductance fluctuation of the electromagnetic coil after starting to flow through the electromagnetic coil Control device for electromagnetic clutch of machine.