JPS60192133A - Control circuit for solenoid-operated coupling device - Google Patents

Abstract

PURPOSE:To make buffer coupling ever so better and prevent a friction noise from occurring as well as to keep off any coupling delay, by increasing exciting power in stages according to operation on a switch. CONSTITUTION:A timer TIM, which starts in response to operation on a switch SW and generates consecutive plural numbers of time-up output, is installed. Simultaneously with this, an oscillator OSC starting delivery of its oscillating output and a pulse generator PG being driven by the output of this oscillator OSC and generating its pulse output both are installed. Upon varying a duty ratio of the pulse output by time-up output of the timer TIM, delivery of the oscillating output is stopped, by the final time-up output. While the pulse generator PG is delivering the pulse output, according to this, an electric current is made flow intermittently to exciting winding L of a solenoid-operated coupling device, and exciting power is gradually increased whereby smooth buffer coupling is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a circuit for controlling an electromagnetic coupling device such as an electromagnetic clutch or an electromagnetic brake.

[Prior art]

“Electromagnetic clutch” (Jikko Sho 4) filed separately by the applicant
7-22293, U.S. Pat. However, if there are large fluctuations in the load through the electromagnetic coupling device, friction noise may be generated when the armature that is first attracted is attracted, or sufficient bonding force may not be obtained in the initial state. This results in disadvantages such as a delay in the connection and insufficient buffer connection.

Conventionally, a simple switch was used to control the electromagnetic coupling device, and only the power to the excitation winding was turned on and off.
The above-mentioned drawbacks cannot be overcome by such control means, and there has been a demand for mechanical improvements as well as the emergence of a control circuit suitable for shock-absorbing connections.

[Summary of the invention]

The present invention has the purpose of completely satisfying the conventional demands, and provides a timer that starts in response to the operation of a switch and sequentially generates a plurality of time-up outputs, and simultaneously starts sending out oscillation outputs. An oscillator and a pulse generator that is driven by the output of this oscillator to generate a pulse output are provided, and the duty ratio of the pulse output is changed by the time-up output of the timer, and the duty ratio of the pulse output is changed by the final time-up output. When transmission is stopped and the pulse generator is transmitting pulse output, current is passed intermittently to the excitation winding of the electromagnetic coupling device, and when transmission of oscillation output is stopped, current is continuously supplied to the excitation winding. The present invention provides an extremely effective control circuit for an electromagnetic coupling device that realizes a smooth buffer coupling by passing a current through the coil and gradually increasing the excitation power.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to figures showing embodiments. First, an electromagnetic coupling device to which the present invention is applied will be described.

Figure 1 is a cross-sectional view of the electromagnetic coupling device.
A triangular plate-shaped center housing 4 is fixed using a nut member 3 that is screwed into the housing, and an input shaft 6 of the load equipment 1 is inserted into a cylindrical part 5 formed protruding from the center of the housing.
is housed therein, and a hexagonal columnar hub T is fixed to the tip of an input shaft 6 that protrudes from the end of the cylindrical portion 5 using a penetrating pin or the like.

Further, a dish-shaped coupling 8 having a boss portion 8a having an inner hole with a shape corresponding to the outer periphery of the hub T is fitted into the hub 7, and is connected to the input pulley 9, bolt 10, and nut 11! The input pulley 9 is engaged at 13 points, and the rotation of the input pulley 9 is transmitted to the input shaft 6.

Note that the input pulley 9 has a collar of 12 m to the outer circumference of the cylindrical portion 5.
, shim 12b1 is rotatably supported by a bearing 15m attached to a washer 13 and a nut 14, and has a circular shape on the surface 9a facing the output pulley 16, which is also supported by the bearing 15b. First and second annular armatures 18, 19 supported at three points by the arc-shaped spring 17 are provided, and a gap g1. g
2 is regulated by a stopper 20 whose head fits into a through hole bored in the opposing surface 9a of the input pulley 9, with the relationship 91<J2.

On the other hand, the output pulley 16 has a facing surface 16& and a shaft attachment portion 1.
6b and an annular peripheral portion 16a, which are integrated with a non-magnetic material 21 such as copper or resin filled in a portion facing the first armature 18, and are Second armature 1 in plane 16&
In addition to forming an annular groove in the part facing 9,
The opposite surface 1 is filled with the same non-magnetic material 22 as described above.
An annular housing part 16d is formed on the opposite side of the output pulley 16, and a magnet 25 made of an excitation winding, a core 24, and a filler material 24m such as resin is housed in this with a gap between it and the inner surface of the output pulley 16. It is.

The upper magnet 25 is fixed to the center housing 4 at three locations with screws 27 via a support plate 26, and is energized via two lead wires 28.

In addition, the shim 12b has an input pulley 9 and an output pulley 1.
This is to adjust the facing distance with 6, and by this,
A general setting of the gap gs, (j2 is made.

In addition, the center housing 4 has long holes 29 drilled in each of the triangular protrusions, and is attached to a bracket for the υ load device 1 with a bolt or the like passing through the hole 29.
The tension of the belt stretched over each pulley 9, 16 is determined by the long hole 2.
The mounting position can be adjusted through the mounting position 9.

FIG. 2 is a plan view of the spring 17, in which arc-shaped branch plates 32 and 33 are formed branching from a common base 31, and armatures 18 and 19 are attached to the tips of these plates by caulking or the like. Through-holes 34 and 35 for fixing are formed, and through-holes 36 and 37 are formed in the base 31 for fixing the spring 1γ to the opposing surface 9m of the input pulley 9. The base portion 31 is fixed with screws, rivets, etc. depending on the direction of rotation shown in the figure.

Therefore, in FIG. 1, when the output pulley 16 is driven by the tension belt and current is passed to the excitation winding, the armature 18 is first attracted to the opposing surface 16a, and then the armature 19 is similarly attracted. As the objects are attracted, the coupling force between the two pulleys 16 and 9 increases as they are successively attracted, so the input pulley 9 sequentially receives a large driving force, and accordingly the input shaft of the load device 1 6 starts rotating and a buffer connection is made.

The armature 18.19 is made of non-magnetic material 21.2.
Due to the intervention of 2, the magnetic flux passes through the armatures 18 and 19 well during adsorption, increasing the adsorption force, and the armature 18 is larger, and
Since the amount of non-magnetic material 21 is large and the attraction force of the armature 18 is stronger than that of the armature 19, a large starting torque can be obtained.

Furthermore, when the excitation winding is de-energized, the elasticity of the spring 17 causes the shear mature 18.
19 returns to its original position and the connected state is released.

When used as an electromagnetic brake, if the load device 1 is the device to be braked and the output gear 6 is fixed, buffer braking will be performed in accordance with the excitation of the excitation winding.

FIG. 3 is a circuit diagram showing an embodiment of the present invention applied to the above-mentioned electromagnetic coupling device, and FIG. 4 is a timing chart showing waveforms of each part in FIG. Comparators CPI and CP2, resistors R1-R5, capacitors CI and C2, and diodes DI and D2 constitute a timer TIM, and the switch S shown in FIG.
When W is turned on, the power supply B is supplied and the reference voltage V divided by the two resistors Ra and R4 is supplied.
s is applied to one input of the comparators CPI and CP2, and the capacitors Cs and C2 are charged through the resistors R2 and Rs, respectively, and the gradually increasing terminal voltage of the capacitors C1 and C2 is applied to one input of the comparators CPI and CP2. The comparison voltages (bl) and (b2) are respectively applied to the other input.

However, the time constant of capacitor C1 and resistor R2 is the time constant of capacitor C2 and resistor R5, and since the voltages (b2) are the same, the time from the start by operating switch SW is Comparator CP1 after t1
The output (c) of the comparator CP2 becomes qi L // (changes to the low level, and after the same time t2 has elapsed, the output (d) of the comparator CP2 A=
'L', and these are generated sequentially as time-up outputs.

Note that the charges of capacitors C1 and C2 are connected to switch S.
If W is turned off, the diode D1. Since the discharge occurs via D2, the above-described operation is always performed accurately in response to turning on of the switch SW.

On the other hand, an oscillator O8C is constituted by resistors R7 and R8, a capacitor C3, and a free-running multivibrator integrated circuit IC1, and outputs a switch SW.

That is, when the output terminal OUT is -H// (high level), the discharge terminal DC is in the off state, and the resistors Ry and R
The capacitor C3 is charged through e, and the terminal voltage of the capacitor C3 gradually rises according to these time constants. When this reaches the discharge threshold level set in the integrated circuit IC1, the capacitor C3 is charged. Since the terminal voltage is applied to the trigger terminal TG and the strain hold terminal TH, the discharge terminal DC is turned on, and the voltage is transferred to the output terminal OUT75E "A L tt, and the charge of the capacitor C3 is transferred to the resistor R8 and discharged. Terminal D
C discharges through the capacitor according to these time constants.

The terminal voltage of C3 gradually decreases.

When the terminal voltage of capacitor C3 decreases to the charge threshold level set in the same way as the discharge threshold, the discharge terminal DC is turned off and the output terminal OUT becomes % H// again. Charging is performed in the same manner as above, and the above operation is repeated. Therefore, from the output terminal OUT, the resistor R7°R8
A square wave signal with a frequency and a duty ratio determined by the value of the capacitor c3 and the value of the capacitor c3 is sent out as an oscillation output, and is passed through a differentiator circuit consisting of the capacitor c4, the resistor R9, and the diode D3 for noise bypass.
The change from / to 1L L // is extracted as a differential pulse.

The reset terminal R of the integrated circuit C1 is connected to the output of the comparator CPI via the diode D4, and when this turns to NL'' as the final time-up output, it is reset and stops oscillation. ing.

In addition, the pulse generator PC is composed of a monostable multivibrator integrated circuit C2, resistors RIO and R11, a capacitor C5, and a transistor Ql. Since the connection point between the resistor RIO and the capacitor c5 is connected to the same terminal DC and the threshold terminal TH, the output terminal OUT is NI L l/, but the differential pulse based on the output of the oscillator OSC is When applied to the trigger terminal TG and driven by it, it turns off the discharge terminal DC and connects the resistor R.
The capacitor C5 is charged via the capacitor C5, and its terminal voltage is gradually increased according to the time constants of both, and the output terminal OUT is transferred to tt Htr.

When the terminal voltage of the capacitor C5 rises and reaches the internally set discharge threshold level, the discharge terminal DC is turned on to quickly discharge the charge of the capacitor C5, and the output terminal OUT is set to %L again. //, maintain this state until it is driven by a differential pulse, and repeat the above operation to reduce the resistor R.
A pulse output (,) with a duty ratio corresponding to the time constant of IO and capacitor C5 is sent out.

If the output of comparator CP2 becomes (c) d(' L tt, transistor Q1 is turned on and resistor Rto
A resistor R11 is connected in parallel to the capacitor C
5, the charging time constant decreases, and the duty ratio of the pulse output (e) changes.

The pulse output (,) is connected to resistors R12 to Rts and transistors Q2. Since the transistors Qz and Qs are turned on only when the pulse output (-) given to the drive circuit DR consisting of Qs is %L/l, the excitation winding of the electromagnetic coupling device shown in FIG. A current (f) is intermittently passed through the wire.

However, due to the inductance component of the excitation winding, the increase in current becomes sloped, and the decrease in current also slopes due to the action of the inductance component, parallel diode D5, and constant current diode ZD. However, the average power increases as the duty ratio changes.

Furthermore, when the output (d) of the comparator CPI reaches 2L, the oscillator OSC stops sending out the oscillation output, and in response, the pulse output (e) of the pulse generator PG maintains the level L. When the transistors Q2 and Q3 of the drive circuit DR remain on, current continuously flows to the excitation winding, and the excitation power becomes maximum.

Therefore, from the time when the switch SW is turned on until the elapse of the time tl, a small amount of power is required, and the time (t2-1I"117
)M)+Y%r+r? hIt41''14otr1KX theory buj (route JL) Excitation is performed by large electric power, and the sequential suction of armatures 1, 8, and 19 shown in Fig. 1 is suitably performed, and the suction force is low in the initial suction state. Since the armature 18 slips smoothly with respect to the output pulley 16, generation of frictional noise is prevented, and as the excitation power increases, complete adsorption is achieved and a good damping connection is achieved.

In addition, in FIG. 3, a constant voltage diode ZD and a diode D5 are used to absorb back electromotive force generated when the excitation winding is energized and disconnected, and also to absorb back electromotive force caused by the Zener voltage of the constant voltage diode ZD. The flow time of the surge current based on the electric power is limited, and the fall time is regulated on the waveform of the current (f).

Further, the capacitor C6 and the diode D6 serve as a bypass for noise components entering the power supply circuit, and prevent malfunctions of various parts due to dirt. However, a counter that counts clock pulses may be used as the timer TIM, and another oscillation circuit may be used as the oscillator OSC. Furthermore, it may be multi-stage, and the configuration of the drive circuit DR can be arbitrarily selected depending on the conditions.

Alternatively, the power source B may be constantly applied, a gate circuit etc. may be inserted, or a circuit provided with an enable terminal, a chip select terminal etc. may be used and these may be controlled by the switch SW. and diode D5
[Effects of the Invention] As is clear from the above explanation, according to the present invention, the excitation power can be changed depending on the operation of the switch. increases gradually, so
The shock-absorbing connection is performed satisfactorily, and no fricative noise or connection delay occurs, and a remarkable effect can be obtained in controlling the electromagnetic coupling device having the shock-absorbing connection function.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an electromagnetic coupling device to which the present invention is applied;
1 is a plan view of the spring in FIG. 1, FIG. 3 is a circuit diagram showing an embodiment of the present invention, and FIG. 4 is a timing chart showing waveforms of various parts in FIG. SW...Switch, TIM...Fist/Timer o
sc----oscillator, pQ*ee pulse generator, DR-・ψ・drive circuit, L・・轡・excitation winding. Patent Applicant Ogura Clutch Co., Ltd. Agent Masaki Yamakawa (2 persons) Figure 2 Procedure Amendment (Voluntary) Mr. Commissioner of the Japan Patent Office Date of 1989 September 18, 1989 1. Indication of the case 1988 Patent application No. 45697 2, Name of the invention: Electromagnetic coupling device side - circuit 3, Name of person making the amendment (name) Ogura Clutch Co., Ltd. 5, Subject of amendment

Claims (1)

[Claims] A timer that starts in response to the operation of a switch and sequentially generates a plurality of time-up outputs, and a timer that sends out an oscillation output in response to the operation of the switch and generates a time-up output during the time-up output. an oscillator that stops sending out the oscillation output in accordance with the time-up output; and an oscillator that is driven by the output of the oscillator to generate a pulse output and has a duty ratio of the pulse output in accordance with the outputs other than the last one of the time-up outputs. a pulse generator that changes the current, and intermittently passes current to the excitation winding of the electromagnetic coupling device in accordance with the output of the pulse generator, and continuously passes current to the winding in response to stopping the transmission of the oscillation output. A control circuit for an electromagnetic coupling device, characterized in that it is provided with a drive circuit that communicates with the drive circuit.