KR950006655Y1 - Switching control apparatus of magnetic cluch - Google Patents

Abstract

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Description

Switching Control of Magnetic Clutch

1 is a schematic configuration diagram of a conventional magnetic clutch.

2 is a schematic control circuit diagram of a conventional magnetic clutch.

3 is a control circuit diagram of a switching control device of a magnetic clutch according to the present invention.

* Explanation of symbols for main parts of the drawings

3: transistor 4: comparator

5: capacitor 6: resistance

7: resistor 8: transistor

9: transistor 10: transistor

11: diode 12: diode

13: resistance 14: resistance

15 resistance 16 zener diode

17: Zener diode 30: magnetic clutch

31: driven clutch plate 32: driving clutch plate

33: micro switch 34: body

35: suction coil 36: holding coil

45: suction coil 46: holding coil

The present invention relates to a magnetic clutch, and more particularly to a switching control device of the magnetic clutch to control the operation of the clutch plate using the magnetic force of the coil.

In general, a clutch is installed between the driving device and the driven device to interrupt the power transmission. Such clutches are classified into friction clutches, fluid clutches, magnetic clutches, and the like according to a method of transmitting power. The friction clutch is a method of transmitting power by using friction between solids, and its structure is simple, and it has a lot of requirements as a clutch and is used in various vehicles. Fluid clutches use fluid (oil) as a medium for power transmission and are widely used with torque converters in recent automatic transmissions. Magnetic clutch is to operate the clutch by using the magnetic force of the electromagnet, magnetized magnetic particles (specially treated iron compound) by magnetizing the excitation coil to operate the clutch.

1 of the accompanying drawings is a view schematically showing a device of a conventional magnetic clutch as described above.

Referring to this, the magnetic clutch 30 has a body 34 of a predetermined form, the suction coil 35 for obtaining the first electromagnetic force when driving the clutch therein and the holding coil for maintaining the operation state once ( 33), and a micro switch 33 is provided to form an electrical circuit with these coils to control the current flowing through the coils. In addition, a driving clutch plate 32 magnetized by the coils 36 and 36 is coupled to one side of the body 34, and is sucked by the magnetic force of the driving clutch plate 32. The driven clutch plate 31 to be engaged is provided on the same axis.

2 is a schematic control circuit diagram showing a driving system of a conventional magnetic clutch. As shown, the suction coil 35 and the holding coil 36 are constituted by parallel circuits around the branch point 37, and a micro switch 33 is provided between the branch point 37 and the suction coil 35. It is installed.

In the control circuit configured as described above, when a power is applied to the terminal and the micro switch 33 is turned on, rich magnetic flux is formed in the suction coil 35 having a large number of turns. As a result, a large suction magnetic force is generated in the drive clutch plate 32, and the driven clutch plate 31 is sucked in the direction of the arrow A to engage with each other. Thereafter, the micro switch 33 is turned off and a minimum current capable of maintaining magnetic force flows into the holding coil 36 to maintain the operating state of the drive clutch plate 32.

As described above, in a conventional magnetic clutch having a control circuit driven by a micro switch, after driving the drive clutch plate, it is necessary to switch quickly so that a current capable of maintaining a minimum operating state flows only toward the holding coil. However, if foreign matter such as dust is caught in the micro switch which performs this function and its operation is not performed smoothly, it continues to flow even after the operation that flowed toward the suction coil during the initial operation, and then current flows to both the suction coil and the holding coil at the same time. This causes the coil to burn out due to the overload and shortens the life.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a switching control device of a magnetic clutch that can greatly extend the life by improving the switching control circuit unit for driving the clutch plate.

In order to achieve the above object, the switching control value of the magnetic clutch according to the present invention includes a drive clutch plate, a driven clutch plate installed to face the clutch operation by being engaged with the drive clutch plate, and supplied from a power source. A suction coil which generates a large electromagnetic force on the driving clutch plate by the supplied current, a holding coil which maintains the operation state of the clutch when the suction coil is interrupted, and the suction coil and the holding coil are installed therein. In the switching control device of the magnetic clutch having a body to which the drive clutch plate is attached to the side, a reference voltage set by dividing the voltage applied from the power supply to a predetermined resistance value and a zener voltage and a resistance smaller than the resistance. Comparator for comparing output voltage and voltage divided by capacitor charge / discharge value When the output voltage of the comparator is high, a bias voltage is applied to a rear transistor to turn on-on switching so that a power current flows through the suction coil to generate a magnetic force. When the output voltage is low, the switching transistor to turn on the off-off switching operation to cut off the current flow of the suction coil and maintain the generation of electromagnetic force by the holding coil and the input voltage from the power source Its features include stabilizing zener diodes, reverse voltage prevention diodes and reverse voltage prevention diodes.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in the first, the magnetic clutch 40 of the present invention has a body 44 of a predetermined shape, and the suction clutch 45 and the operating state to obtain the first large electromagnetic force when driving the clutch therein. A retaining coil 46 for holding the coil, and a micro switch 43 which forms an electrical circuit with these coils and regulates the current flowing through the coil are provided. In addition, a driving clutch plate 42 which is magnetized by the coils 45 and 46 is coupled to one side of the body 44, and a driven clutch engaged with the driving clutch plate 43. The plate 41 is provided on the same axis. In addition, a switching control device is built in the body 44 of the magnetic clutch to control the operation state of the clutch plate.

3 is a schematic control circuit diagram of controlling the current flowing in the coil in the magnetic clutch of the present invention having the configuration as described above. According to this, the control circuit compares the driving unit composed of the suction coil 45 and the holding coil 46 and the transistor 3 to convert the electrical signal into the magnetic signal, and the time comparison for determining the ON voltage and the reference voltage terminal. A comparator comprising an op amp 4, which is a circuit, a capacitor 5 for discharging the voltage when the power supply voltage is OFF, and resistors 6 and 7, and a signal detected by the comparator. , 10) amplification section for three-stage amplification and a reverse voltage prevention section for preventing circuit damage due to user error.

In addition, the comparison section is provided with a diode 11 for discharging the residual voltage, the reverse voltage prevention section is a diode 12, and the amplification section is provided with resistors 13, 14, and 15. Here, unexplained numerals 16 and 17 are zener diodes.

In the control circuit configured as described above, when power is applied to the input terminal IN, a voltage is applied to the input terminal of the IC 4, and the output terminal becomes a bias voltage of the transistor 8 by the resistor 13. Subsequently, when the transistor 8 operates, a base voltage is formed in the last transistor 3 through the transistors 9 and 10 at the rear end thereof, and a short state is applied to the suction coil 45. As a result, magnetic force lines are formed in proportion to the current flowing through the coil, and thus the driving clutch plate 42 is sucked and separated from the driven clutch plate 41.

At the same time, the voltage at the input of the comparator's IC 4 is gradually increased by the resistor 6 and the capacitor 5, so that when the voltage is greater than the voltage at the input of the IC 4, the comparator's output state is high (hihg). The transistor 8, 9, 10, 3 is turned off by inverting to a low state. Therefore, when the transistor 3 is turned off, the current supplied to the suction coil 45 is cut off, and the magnetic force generated by this coil is dissipated. However, at the same time, the driving clutch plate 42 continues to be driven by the magnetic force generated by the retaining coil 46, and the driven clutch plate 42 keeps being separated from the driven clutch plate 41. Therefore, the two clutches are coupled to each other. The operating state is maintained.

As described above, in the switching control device of the magnetic clutch of the present invention, unlike the related art, the switch mechanism which intercepts the current flowing in the coil adopts a contactless switching system using IC and transistor, so that the switch due to foreign matter intervention, etc. It is possible to prevent coil burnout caused by malfunction of the device, which can greatly prolong the life of the product.

Claims (3)

A drive clutch plate, a driven clutch plate which is engaged to be engaged with the drive clutch plate to be engaged with the clutch, and a suction coil which generates a large magnetic force on the drive clutch plate by a current supplied from a power source; Switching control of the magnetic clutch having a holding coil for maintaining the operating state of the clutch during the current interruption of the suction coil, and a body in which the suction coil and the holding coil are installed and the drive clutch plate is attached to the side thereof. An apparatus comprising: a comparison unit for comparing and outputting a reference voltage set by dividing a voltage applied from the power supply to a predetermined resistance value and a zener voltage, and a voltage divided by a resistance value smaller than the voltage and a capacitor charge / discharge value; When the output voltage of the comparator is high, the bias voltage The turn-on switching operation causes a power current to flow through the suction coil to generate an electromagnetic force, and when the output voltage of the comparator is low due to the capacitor discharge value of the comparator, the transistor of the next stage is turned on and off. It includes a switching passive unit for blocking the current flow of the coil and to maintain the generation of electromagnetic force by the holding coil, a zener diode 17 for stabilizing the input voltage from the power source and a diode 12 for preventing reverse voltage Switching control device of the magnetic clutch, characterized in that. 2. The amplifier of claim 1, further comprising an amplifier for amplifying and outputting three stages of the signal detected by the comparator between the comparator and a transistor of the switching driver, and a bias resistor for the amplification part. Switching control device of magnetic clutch. The method of claim 1, wherein the comparator divides the voltage applied from the power supply and sets the resistor 7 and the zener diode 16 to the reference voltage, and drops and charges and discharges the voltage applied from the power supply to the comparison voltage. A resistor (6) and a capacitor (16), a diode (11) for discharging the residual voltage of the capacitor (16), and an op amp (4) for comparing and detecting and outputting the reference voltage and the comparison voltage. Switching control device of the magnetic clutch, characterized in that.