KR930007183Y1 - Break coil control circuit for motor - Google Patents

Abstract

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Description

Brake Coil Control Circuit of Motor

1 is a schematic view of the operation of the present invention.

2 is a circuit diagram of the present invention.

3 is a block diagram of a control unit of the present invention.

4 is a detailed circuit diagram of a control unit of the present invention.

5 is a waveform diagram of a synchronization signal applied to a phase control unit of the present invention.

6 is a phase control output pulse waveform diagram of the present invention.

7 is a firing angle adjustment range and output voltage waveform diagram of the three-phase full-wave rectification circuit of the present invention.

* Explanation of symbols for main parts of the drawings

1: control unit 2: strong excitation adjusting volume

3: weak excitation volume adjustment 4: timer adjustment volume

5: three-phase full-wave rectifier circuit 6: brake coil

7 interface unit 8 timer circuit

9: current adjusting unit 10: phase control unit

10a to 10f: 1st to 6th phase control unit 11: Power supply unit

12 gate block 13 overload protection circuit

14: operation button PC: photo coupler

OP ₁ , OP ₂ : 1st and 2nd comparators Q ₁ -Q ₂ : resistance

C _{1 to} C ₄ : Condenser SCR _{1 to} SCR ₇ : Dyistor

ZD: Zener Diode LED ₁ : Power Lamp

LED ₂ : driving lamp IC ₁ , IC ₂ : constant voltage circuit

TS ₁ , TS ₂ : pulse transformer

The present invention relates to a circuit for controlling a brake coil to stop the rotation of the motor, and more particularly to a brake coil control circuit of the motor that can be braked by a mechanical friction torque using an electromagnet.

In general, in the case of coal mines using various motor facilities, lifts and lifters for lifting heavy objects, and cranes, the brakes of the motor are operated when the motor is converted from forward rotation to reverse rotation or suddenly stopped during operation.

Therefore, the brake coil having the function of the conventional braking device exerts the braking force by the sequence circuit, thereby controlling the strong and weak voltage by turning on and off the magnet contact, and periodically changing the tip according to contact wear and welding. Since the timer for adjustment of strong / voltage time is air suction type, the holding time of strong / weak voltage is set according to the amount of air, so it is difficult to set the correct time, and if the air inlet is blocked by foreign matter, etc. Due to the conversion of the set time, a strong voltage is continuously applied and breakage of the brake coil takes not only a lot of recovery time but also a lot of power loss, so that the reliability of the motor drawing device could not be obtained.

Therefore, in order to solve the above problems, the present invention allows the brake coil and the power and weak excitation currents to be controlled in a non-contacted state by the timer circuit and the current adjustment unit, and by allowing the adjustment of the power and weak excitation durations. Even if it is used for a long time, there is no change in the setting time of strong and weak excitation due to foreign substances, and it has a semi-permanent life according to the configuration of the semiconductor circuit. It is an object of the present invention to provide a brake coil control circuit of an electric motor.

The brake coil control circuit of the motor according to the present invention is a pulse transformer for generating a plurality of synchronous signals by separating three-phase sine waves of different phases, and a strong / weak excitation control for specifying a strong and weak excitation current applied to the brake coil. It is connected to the volume and the output terminal of the pulse transformer and the strong and weak excitation control volume to generate a predetermined current every predetermined time by the synchronization signal of the pulse transformer, and combines the predetermined current and the synchronization signal to generate a pulse of a certain period. A control unit which protects the brake coil generated by the over current, an operation button connected to the control unit to operate the system, and an output pulse and a synchronization signal of the control unit connected to the output terminal of the control unit to excite the brake coil. It is connected to the three-phase full-wave rectifier circuit for supplying current and the control unit to display the power supply and operation status The hour is made up of lamps.

Hereinafter, described in detail by the accompanying drawings as follows.

2 is a brake coil control circuit diagram according to the present invention, the three-phase power supply voltage (u, v, w) of different phases is composed of the primary coil and the thyristor (SCR ₁ ~ SCR ₆ ) of the pulse transformer (TS ₁ ) Supplied to the three-phase full-wave rectifier circuit 5, a plurality of synchronization signals a to f generated by the secondary coil of the pulse transformer TS ₁ are applied to the control unit 1, and the control unit 1 ), The power excitation control volume (2), the weak excitation control volume (3), the timer control volume (4), and the power and driving lamps (LED ₁ ) (LED ₂ ) are connected to each other, and at the output of the control unit (1) The thyristors SCR _{1 to} SCR ₂ of the rectifier circuit 5 are connected, while the brake coil 6 is connected to the controller 1 and the three-phase full-wave rectifier circuit 5, respectively.

3 is a detailed block diagram of the control unit 1 according to the present invention, which insulates the signal power from the outside and is provided to the output terminal of the interface unit 7 having a function of converting to a level required by the internal control circuit. And a safety circuit which transmits to the three-phase full-wave rectifier circuit 5 after confirming that there is no abnormality by receiving a signal from the timer circuit 8 controlling the weak excitation switching time and the brake open command from the input unit and the overload protection circuit 13. The gate block 12, which is a device, is connected to each other, and the output terminal of the timer circuit 8 is connected to a current adjusting unit 9 for adjusting the strong and weak excitation currents, and meets the required values of the current adjusting unit 9. It is connected to the phase control part 10 which adjusts a firing angle so that a corresponding electric current may flow, and produces | generates a high quality pulse so that the three-phase full-wave rectification circuit 5 may be correctly burned.

In addition, the input terminal of the overload protection circuit 13 is connected to the brake coil 6 to control the gate block 12 when an overcurrent flows from the brake coil 6 due to loss of weak excitation switching function or other causes. It is applied to prevent damage to the device and to supply the power required for each circuit from the power supply section (11).

When explaining the operation and effect of the present invention made of the above configuration by the detailed circuit diagram shown in Figures 1 to 7 as follows.

1 is a schematic view of the operation of the present invention, when the brake is holding the rotor of the motor when the power is cut off as shown in (a), and the operation of the motor is required. The motor can be operated by releasing the rotating body.

In more detail, first, when the three voltages u (v) (w) of 220V having different phases as shown in FIG. 7a are applied to an input terminal which is the primary coil of the pulse transistor TS ₁ shown in FIG. Through the fuses F ₁ (F ₂ ) and F ₃ , the three-phase full-wave rectifier circuit 6, the thyristors SCR _{1 to} SCR ₆ , the anode and the cathode are energized, and the three phases of u, v, and w are applied. The waveform is induced in the secondary coil of the pulse transformer TS ₁ to generate synchronous voltages a to f of 18V having different phases, and are supplied to the controller 1 so that the controller 1 receives its synchronous voltages a to f) is detected and the power lamp (LED ₁ ) is turned on.

That is, the synchronization signals a to f are applied to the power supply unit 11, which is the control unit 1 of FIG. 4, to be rectified by the bridge diode BD, and also via the constant voltage circuit IC ₁ and IC ₂ . As a result, the bias voltage DC + 15 (V) turns on the power lamp (LED ₁ ) and supplies driving power to make all circuits operable.

Then adjust the excitation control volume (2), weak excitation adjustment volume (3), and timer adjustment volume (4) to adjust the drive voltage and drive sustain voltage of the initial brake coil (6) and the excitation voltage to the weak excitation voltage. Set each time to be converted.

In this state, when the driver connects the operation button 14 to the on state in order to operate the brake coil 6, the photocoupler PC of the interface unit 7 is operated to turn on the transistor Q ₁ . The gate block 12 is released due to the output of the transistor Q ₁ .

That is, the transistor Q ₁ output of the interface 7 is applied as a bias voltage to the base of the transistor Q ₂ through the zener diode ZD, which is the gate block 12, and is turned on as the driving lamp LED _2. ) And the next transistor Q ₃ (Q ₄ ) are sequentially conducted so that the pulse transformer TS ₂ of the plurality of first to sixth phase controllers 10a to 10f in the phase controller 10 is turned on. The primary coil is " high " to enter a state in which the synchronization signals a to f can be transmitted to the first to sixth phase controllers 10a to 105.

At the same time, the output of the transistor Q ₁ , which is the interface unit 7, generates a trigger pulse by the differential circuit of the capacitor C ₁ and the resistor R ₁ , and transmits the trigger pulse to the timer circuit 8. ) Outputs a 15V voltage for a time set by the timer adjusting volume 4 when the trigger pulse is applied, and is transmitted to the current adjusting unit 9.

At this time, the output voltage of the current adjusting unit 9 is adjusted by the strong and weak excitation control volume (2) (3), the first comparator (OP ₁ ) by the weak excitation control volume (3) The reference voltage Ref ₁ is set, and the second comparator OP ₂ is set with the reference voltage R ef ₂ by the booster adjusting volume 2.

Accordingly, when a voltage of 15 V is applied from the timer circuit 8 to the operational amplifier OP ₃ , the associative amplifier OP ₃ amplifies the 15 V voltage by R ₂ C ₂ dt and transmits the same to the phase controller 10. At this time, the output of the operational amplifier (OP ₃ ) is applied to the other terminal of the second comparator (OP ₃ ) when compared with the reference voltage (Ref ₂ ) set to the exciter control volume (2) when the same as the reference voltage second comparator the output of the (OP ₂₎ is fixed a constant output voltage of the voltage stops the amplification by the operational amplifier (OP ₃₎ of the operational amplifier (OP ₃₎ by being at a high level output output and of such an operational amplifier (OP ₃₎ The voltage output time is determined by the 15V output pulse width of the timer circuit 8, at which time it is a strong exciting time, and after that, it is a weak exciting time.

Therefore, the operational amplifier OP ₃ is applied to the base of the transistor Q ₅ through the resistor R ₃ of the first phase controller 10a, and at this time, the operation of the synchronous voltage a and the current regulator 9 as shown in FIG. The transistor Q ₅ is turned on and off by the 15V voltage output from the amplifier OP ₃ , and the voltage of the current adjusting unit 9 is synchronized by the synchronous voltage a to turn on and off the transistor Q ₅ . The time is changed, and a plurality of circuits such as the first phase controller 10a are formed (10b to 10f), and the remaining synchronization signals b to f are supplied to the second to sixth phase controllers 10a to 10f. . I.e., the transistor (Q ₅₎ is a die-liquid (DIAC) is turned off when the conduction is a condition that is an electric charge to the capacitor (C ₃₎ charged by the synchronizing voltage (a) the transistor (Q ₅₎ is cut off die solution ( When DIAC conducts and drives transistor Q ₆ , the charge charged in capacitor C ₃ is discharged to generate a pulse as shown in FIG. 5 (L _{1 to} L ₂ ).

That is, the phase control unit 10 generates the instantaneous pulse exceeding " 0 " V by remaining the synchronization signals a to f and the output signal of the current adjusting unit 9, and the output signal of the current adjusting unit 9 If it is close to "0" V, the firing phase is advanced, and as the polarity is increased to "-" polarity, the firing phase is modified to perform the phase control function.

On the other hand, when a pulse as shown in FIG. 5B is applied to the primary side of the pulse transformer TS ₂ , pulses K1 to K6 as shown in FIG. 6 and as shown in FIG. 6 are output, and each of the first to sixth phase controllers 10a to FIG. the thyristors (SC R ₁ ~SCR there is applied to the gate of ₆₎ signal (u) having a different phase of the first 220V (v) a pulse signal (K1~K6) is a three-phase full-wave rectification circuit (5) of 10f) ( The phase voltage of w) is represented by the waveform as shown in Fig. 7a, but the line voltages uv, uw, and wv are shown in Fig. 2b, and K ₁ to 6 phase controllers 10a to 10f are provided. When the waveform of the K ₆ is applied to the gate thyristors (SCR ₁ ~SCR ₆₎ of the three-phase full-wave rectification circuit 5 by a trigger signal, the thyristor (SCR ₁ ~SCR ₆₎ is in a conductive state propagation as the help 7d The rectified DC voltage is output and supplied to the brake coil 6 to excite, thereby enabling the motor to be braked and rotated.

On the other hand, is the time set in the braking coil 6 is excited state completes the output of the timer circuit (8) when the "low" due to -15V it took the resistance (R ₂₎ of the current adjustment section 9, the operational amplifier ( OP ₃ ) is inverted to a positive voltage, which is applied to the input of the first comparator OP ₁ to generate a "high" signal at the same potential as the voltage set by the weak excitation regulating volume 3. The output voltage of the operational amplifier OP ₃ is fixed.

Therefore, after a predetermined time set in the timer circuit 8 in the first to sixth phase controllers 10a to 10f, the weak excitation output voltage set by the adjustment of the weak excitation regulating volume 3 is reduced to less than the strong excitation voltage and thus the brake coil 6 By maintaining the excitation of the power consumption can be significantly reduced.

On the other hand, the overload protection circuit 13 detects the voltage applied to the brake coil 6 when the initial voltage continues to the brake coil 6, the gate block 12 is turned off to detect the voltage applied to the brake coil 6 It has a function to block the supplied control signal.

That is, the + 15V voltage of the overload protection circuit 13 is divided by a plurality of resistors, and the inverted -14.3V voltage is applied to the input terminal point of the differential amplifier OP ₄ as a reference voltage, and then applied to the brake coil 6. When the initial voltage is applied, the difference between the current at the point P and the reference current of the differential amplifier OP ₄ flows to the capacitor C ₄ , and as a result, the integrated voltage is output. After dt time, the output signal of the differential amplifier OP ₄ is 1.4V. If the voltage is higher than the reference low voltage of -14.3V and the voltage difference between the reference voltage and the P point (1.4V) is appropriate, the trigger signal is applied to the gate of the thyristor (SCR ₇ ). By turning off the output power of the interface unit 7 supplied to the gate block 12 by making the state, the transistor Q ₂ is turned off and the transistor Q _{3 of the} rear stage is simultaneously turned off. Connection to pulse transformer (TS ₂ ) A transistor (Q ₄₎ also turned off the pulse transformer (TS ₂₎ DP is connected transistor (Q ₄₎ also turned off the pulse transformer is also turned off, the transistor (Q ₄₎ connected to (TS ₂₎ of said pulse transformer ( By blocking TS ₂ ), the output of the phase control unit 10 of the gate block 12 is not transmitted to the three-phase full-wave rectifier circuit 5.

That is, when the voltage difference between both ends of the resistor R ₄ is compared with the differential amplifier OP ₄ , when the voltage difference between both ends reaches the worry level, the thyristor SCR ₇ after the time determined by the time constant of the capacitor C ₄ is reached. ) To prevent the overcurrent from being supplied to the brake coil 6.

On the other hand, when the operation button 14 is turned off, as the photocoupler PC of the interface unit 7 is turned off, the gate block 12 and the timer circuit 8 are not operated and the brake coil 6 is eventually operated. The brake is braked by the electric motor and the rotation is forcibly stopped by mechanical friction torque.

The present invention, which operates as described above, separates three-phase visual waves having different phases, generates a plurality of simultaneous signals, operates a pulse transformer, an operation button, and a strong / weak excitation current according to a gate block and an overload. A control unit which prevents breakage of the brake by the protection circuit and generates pulses for efficiently controlling the brake coil according to the operation state of the interface, the timer circuit and the phase control unit and the gate block, and the plurality of synchronization signals and the control unit. By providing a brake coil control circuit of an electric motor consisting of a three-phase full-wave rectifier circuit that supplies a stable current to the brake coil by combining pulses, the response speed is fast, and the strong and weak current variable delivered to the brake coil can be easily adjusted. Power consumption by reducing the losses in resistors To reduce, and not only a permanent current switch made up of solid state due to the accurate control to the device that can contribute significantly to improving the reliability of the motor.

Claims (2)

In the brake coil control circuit of an electric motor, a pulse transformer TS ₁ for generating synchronous signals a to f by separating sine waves of three phases (u, v, w) having different phases, and a brake coil 6 Is connected to the output of the pulse transformer (TS ₁ ) and the output of the pulse transformer (TS ₁ ) and the strong and weak excitation control volume (2) (3). Then, a predetermined current is generated every predetermined time by the synchronization signals a to f of the pulse transformer TS ₁ , and the predetermined current and the synchronization signals a to f are combined to generate pulses K1 to K6 of a predetermined period. ), A control unit (1) for protecting the brake coil (6) due to overcurrent, an operation button (14) connected to the control unit (1) for operating the system, and connected to the output terminal of the control unit (1) By combining the output pulses K1 to K6 and the synchronization signals a to 5 of the control unit 1 to supply an excitation current to the brake coil 6. The emergency supply brake coil control circuit of the electric motor consisting of a three-phase full-wave rectifier circuit (5) and a lamp (LED1) (LED2) connected to the control unit (1) to indicate the power supply and operation status. 2. The control unit (1) according to claim 1, wherein the control unit (1) includes an interface unit (7) for generating a predetermined voltage by operating the operation button (14), and a timer adjusting volume (4) by an output voltage of the interface (7). Timer circuit 8 for outputting a pulse for a set time and a current adjustment unit connected to the output terminal of the timer circuit 8 to generate a predetermined voltage set by the strong and weak adjustment volume (2) (3) for a predetermined time (9) and a phase control unit (10) connected to the output terminal of the current adjusting unit (9) to generate a pulse of a predetermined period by combining the synchronization signals (a to f) and the output signals of the current adjusting unit (9); The gate block 12 connected to the interface unit 7 to operate the phase control unit 1 when the operation button 14 is operated, and is connected between the interface unit 7 and the gate block 12 to brake coil 6. ) When the overload is applied to the brake coil 6 by controlling the gate block 12 The brake coil control circuit of an electric motor comprising an overload protection circuit 13 for interrupting a current and a power supply unit 11 for generating a predetermined power by the synchronization signals a to f to supply driving power to a peripheral circuit. .