JPH0654567A - Motor operation circuit - Google Patents

Abstract

PURPOSE:To obtain a motor operation circuit which is free from the influence of the vibration of a load driven by the motor and improves the lifetime of circuit parts, such as relays, involved. CONSTITUTION:The title operation circuit consists of a rectifying circuit 2 which rectifies the alternating current from an a.c. power supply 1; motor 8 driven by the output from the rectifying circuit 2; motor operation switch 4 provided in the power path between the rectifying circuit 2 and motor 8; relay 7, including contacts 5 and 6, inserted in the power path between the motor operation switch 4 and motor 8; and delay circuit 9, placed on the output side of the rectifying circuit 2, which, a specified time after the motor operation switch 4 being turned on, energizes the relay 7 and thereby makes the contacts 5 and 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor operating circuit, and more particularly to operating a motor for electrically charging a closing spring for turning on / off a main circuit contact in a circuit breaker such as an air circuit breaker. The present invention relates to a motor operating circuit.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional motor operating circuit used in, for example, an air circuit breaker. In the figure, 1 is an AC power source, 2 is a rectifier circuit that rectifies the AC current from the AC power source 1, and 3 is an output of the rectifier circuit 2 via a motor operation switch 4 that is turned on when power is supplied, for example, using a microswitch. Side, the motor operation switch 4
The relay coils 5 and 6 energized by the DC current from the on-time rectification circuit 2 are relay contacts, and the relay coil 3 and the relay contacts 5 and 6 form a relay 7. Reference numeral 8 is connected to both ends of the relay coil 3 via relay contacts 5 and 6, and electrically charges a closing spring for turning on / off a main circuit contact in a circuit breaker such as an air circuit breaker (not shown). It is a motor for doing. Here, the AC power supply 1 is outside the circuit breaker, and the rectifier circuit 2, the relay 3, and the relay contacts 5 and 6 are substrates (not shown) in the circuit breaker.
Is loaded into.

Next, the operation of the conventional motor operating circuit shown in FIG. 2 will be described. Now, when the motor operation switch 4 is turned on at the time of supplying power, a direct current flows from the rectifier circuit 2 to the relay coil 3 and is energized, whereby the relay contacts 5 and 6 are closed and the motor 8 is driven. To be done. By driving the motor 8, a cam (not shown) connected to the motor 8 is rotated to charge the closing spring and drive the circuit breaker by its releasing force to close the main contact. At this time, the relay contacts 5 and 6 of the relay 7 are opened when charging of the closing spring is completed,
Then, when the charge of the closing spring is released, the motor operation switch 4 is turned on to close the motor again.

[0004]

The conventional motor operating circuit is constructed as described above, and the motor 8 operates immediately when the motor operating switch 4 is turned on, that is, the circuit breaker operation and the motor operation switch 4 ON operation are substantially performed. Therefore, the circuit breaker vibrates due to the charge release of the closing spring or the impact at the time of contact of the main contact of the circuit breaker, which causes the relay 7 closed again at the same time as the closing spring is released. There is a problem that the relay contacts 5 and 6 cause so-called chattering, the relay contacts 5 and 6 are quickly consumed, and the relay is affected by vibration of a load driven by a motor such as welding.

The present invention has been made in order to solve such a problem, and it is a motor operation capable of improving the life time of circuit components used without being affected by the vibration of a load driven by the motor. Aim to get the circuit.

[0006]

A motor operating circuit according to the present invention comprises a rectifying circuit for rectifying an alternating current from an alternating current power source, a motor driven by the output of the rectifying circuit, the rectifying circuit and the motor. Between the motor operating switch and the motor, a relay having a contact inserted in the power source path between the motor and the motor, and a motor operating switch provided on the output side of the rectifying circuit. And a delay means for closing the contact by energizing the relay a predetermined time after the switch is turned on.

[0007]

According to the present invention, the delay means is provided on the output side of the rectifier circuit, and the relay is energized a predetermined time after the motor operation switch is turned on to close the contact inserted in the power supply path of the motor. Drive the motor. This prevents the relay contacts from chattering due to vibration of the load driven by the motor.

[0008]

EXAMPLES Example 1. The following is a description of the drawings, taking as an example the case where one embodiment of the present invention is applied to an air circuit breaker as in the conventional example described above. FIG. 1 is a block diagram showing an embodiment of the present invention, in which parts corresponding to those in FIG.
Detailed description thereof will be omitted. Reference numeral 9 is a delay circuit as delay means connected to the output side of the rectifier circuit 2 via the motor operation switch 4, and as an example, resistors 91 to 93, capacitors 94 and 95, a constant voltage element such as a Zener diode 96, It is composed of a switching element such as a thyristor 97.

One end of the voltage dividing resistor 91 is connected to the positive output side of the rectifier circuit 2 via the motor operating switch 4, and the other end is connected via a voltage dividing resistor 92 and a time-limiting capacitor 94 connected in parallel. It is connected to the negative output side of the rectifier circuit 2. The other end of the resistor 91 is connected to the cathode of a constant voltage element such as a Zener diode 96. The anode of the Zener diode 96 is connected to the negative output side of the rectifier circuit 2 via the resistor 93 and the noise preventing capacitor 85 which are connected in parallel, and is also connected to the switching element, for example, the gate of the thyristor 87. The anode of the thyristor 87 is connected to the relay coil 3, and the cathode thereof is connected to the negative output side of the rectifier circuit 2. Other configurations are the same as those in FIG. The delay time of the delay circuit 9 is substantially determined by the resistance value of the resistor 91, the capacitance value of the capacitor 94 and the Zener voltage of the Zener diode 96, and is, for example, 0.1.
Set to seconds.

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be described. Now, when the motor operation switch 4 is turned on at the time of supplying power, a DC current flows from the rectifier circuit 2 to the capacitor 94 via the resistor 91 of the delay circuit 9, and charges the capacitor 94. When the terminal voltage of the capacitor 94 exceeds the Zener voltage of the Zener diode 96, the Zener diode 96 breaks down and the Zener diode 96
A voltage across the resistor 93 is generated by the current passing through. Then, the terminal voltage of the resistor 93 is the thyristor 9
When the gate voltage of 7 is reached, the thyristor 97 is turned on, a DC current flows from the rectifier circuit 2 to the relay coil 3, and this is energized, whereby the relay contacts 5 and 6 are closed and the motor 8 is driven. .

By driving the motor 8, a cam (not shown) connected to the motor 8 is rotated to charge the closing spring and the releasing force drives the circuit breaker to close the main contact. At this time, the relay contacts 5 and 6 of the relay 7 are opened when the charging of the closing spring is completed, and do not close even if the operation switch 4 is turned on at the same time when the charging of the closing spring is released. After 0.1 seconds, the thyristor 97 is turned on, the relay coil 3 is energized, and then closed again. Therefore, when the relay contacts 5 and 6 of the relay 7 are closed again, the charge release of the closing spring or the contact of the main contact of the circuit breaker has already ended, and the shock breaks the circuit breaker as a load. , Relay contacts 5, 6 of relay 7
Does not cause chattering.

Example 2. In the above embodiment, the case where the present invention is applied to the air circuit breaker of the circuit breakers has been described, but the present invention is not limited to this, and the same applies to other electric devices that require such a function. Can be applied to the same effect. Further, the delay circuit as the delay means is not limited to the configuration of the above embodiment, and other configurations may be used.

[0013]

As described above, according to the present invention, a rectifier circuit for rectifying an AC current from an AC power source, a motor driven by the output of the rectifier circuit, and a rectifier circuit between the rectifier circuit and the motor. A motor operation switch provided on the power supply path, a relay having a contact inserted in the power supply path between the motor operation switch and the motor, and a switch provided on the output side of the rectifier circuit to turn on the motor operation switch. Circuit parts such as relays used without being affected by the vibration of the load driven by the motor, since the delay means for energizing the relay to close the contact after a predetermined time has been provided. There is an effect that the life time of the can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a motor operating circuit according to the present invention.

FIG. 2 is a configuration diagram showing a conventional motor operating circuit.

[Explanation of symbols]

 1 AC power supply 2 Rectifier circuit 3 Relay coil 5, 6 Relay contact 7 Relay 8 Motor 9 Delay circuit

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[Procedure amendment]

[Submission date] December 11, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a motor operating circuit, to operate the motor for electrically charging the closing spring to turning on the main circuit contacts in particular, for example the circuit breaker breaker like in the air The present invention relates to a motor operating circuit.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

According to the present invention, the delay means is provided on the output side of the rectifier circuit, and the relay is energized a predetermined time after the motor operation switch is turned on to close the contact inserted in the power supply path of the motor. Drive the motor. This prevents the relay contact from chattering due to the vibration of the closing spring when the charge is released.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

One end of the voltage dividing resistor 91 is connected to the positive output side of the rectifier circuit 2 via the motor operating switch 4, and the other end is connected via a voltage dividing resistor 92 and a time-limiting capacitor 94 connected in parallel. It is connected to the negative output side of the rectifier circuit 2. The other end of the resistor 91 is connected to the cathode of a constant voltage element such as a Zener diode 96. The anode of the Zener diode 96 is connected to the negative output side of the rectifier circuit 2 via the resistor 93 and the noise preventing capacitor 85 which are connected in parallel, and is also connected to the switching element, for example, the gate of the thyristor 97 . The anode of the thyristor 97 is connected to the relay coil 3, and the cathode thereof is connected to the negative output side of the rectifier circuit 2. Other configurations are the same as those in FIG. The delay time of the delay circuit 9 is substantially determined by the resistance value of the resistor 91, the capacitance value of the capacitor 94 and the Zener voltage of the Zener diode 96, and is, for example, 0.1.
Set to seconds.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be described. Now, when the motor operation switch 4 is turned on at the time of supplying power, a DC current flows from the rectifier circuit 2 to the capacitor 94 via the resistor 91 of the delay circuit 9, and charges the capacitor 94. When the terminal voltage of the capacitor 94 exceeds the Zener voltage of the Zener diode 96, the Zener diode 96 breaks down and the Zener diode 96
A voltage across the resistor 93 is generated by the current passing through. Then, the terminal voltage of the resistor 93 is the thyristor 9
When the gate trigger voltage of 7 is reached, the thyristor 97 is turned on, a DC current flows from the rectifier circuit 2 to the relay coil 3, and this is energized, whereby the relay contacts 5 and 6 are closed and the motor 8 is driven. It

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirohei Fujiwara 1-8 Midoricho, Fukuyama City Mitsubishi Electric Corporation Fukuyama Factory

Claims (1)

[Claims] 1. A rectifying circuit for rectifying an alternating current from an alternating current power source, a motor driven by the output of the rectifying circuit, and a motor operation switch provided in a power supply path between the rectifying circuit and the motor. A relay having a contact inserted in the power supply path between the motor operation switch and the motor; and a relay provided on the output side of the rectification circuit, which is provided a predetermined time after the motor operation switch is turned on. A motor operating circuit, comprising: a delay means for urging the contact to close the contact.