KR100394070B1 - A magnet brake no contact device - Google Patents

Abstract

Disclosed is a direct current magnet contactless device using an isolated gate bipolar transistor (IGBT) instead of a magnetic contactor (CONTACTOR) contact for use in controlling DC magnet brakes of AC and DC motors used in all industries. The magnet brake solid-state device according to the present invention includes a brake switch for controlling operation of a motor, a first RC circuit for supplying a power voltage according to the operation of the brake switch, and a first output signal output from the first RC circuit. And a second RC circuit for changing the magnitude of the second output signal output from the inverter circuit at an exponential function, and outputting the inverter circuit by inverting and outputting the second output signal according to the operation of the brake switch during operation of the motor. A power supply applying time adjusting circuit for causing the second output signal to increase exponentially by the time constant of the second RC circuit; A weak excitation voltage regulating circuit for generating a pulse periodically; Receiving the first output signal, the second output signal, and the pulse, and outputting a booster signal corresponding to a logical product of an inverse phase of the first output signal and an inverse phase of the second output signal during operation of the motor; A gate array logic configured to output a weak excitation signal corresponding to the logical product of the second output signal and the pulse; And receiving the booster signal and the weakly excited signal, and controlling the magnet coil of the IGBT element to remain in the excited state while the exciting signal is activated, and the magnetic coil is weak while the bad signal is activated. And an IGBT drive circuit for controlling to remain in an excited state.

Description

Magnet brake no contact device {A magnet brake no contact device}

The present invention relates to a DC magnet contactless device using IGBT (Isolated Gate Bipolar Transistor) instead of a magnetic contactor (CONTACTOR) contact used for controlling DC magnet brakes of AC and DC motors used in all industries. It is about.

DC magnet brake operation is explained as follows. When the motor is stopped, the brake plate contacts the shaft of the motor on both sides to prevent rotation. To operate the motor, a current is applied to the magnet brake coil COIL to open the brake plate from the motor. When the current is applied, initially, a strong current must be applied to separate the plate, and once the plate is separated, a weak current enough to hold the state can be applied. These are called strong excitation driving and weak excitation driving respectively. The operation method of the conventional DC magnet brake will be described in detail with reference to FIG. 1 as follows.

When the forward and reverse operation switch (FWD or REV) of the motor is turned on, the contactor coils (CONTACTOR COIL: BR, BRF) are excited at the same time, and the BR and BRF contacts are turned on. Therefore, for example, DC 220 [V] is applied to the DC magnet coil. This time is called the energized state and the brake plate falls from the motor. After about 0.5 ~ 1.2 seconds, when the timer is off and the power of BRF coil is cut off, BRF contact is turned off and DC 24 ~ 50 [V] is applied to DC magnet coil through BR1 resistor. This time is called weak girl state. When the motor is stopped, the BR contact is turned off, and the voltage applied to the DC magnet coil becomes ZERO, and energy stored in the coil is consumed as heat through the resistor BR2.

As mentioned above, the operation of DC magnet brake is divided into strong and weak excitation. This operation uses general magnet contact, so it is necessary to replace the magnet by wear and fusion of magnet contact for a long time.

Therefore, an object of the present invention is to make contactless and weak excitation brake systems used in a brake device of a motor non-contact by using a logic circuit and a semiconductor switching element.

Another object of the present invention is to implement an electronic circuit and the control logic of the power and weak excitation applying device implemented by a conventional timer and contact switch.

According to the present invention, a semi-permanent contactless magnet brake device which does not require replacement due to wear and fusion of contacts, which is a problem of the conventional DC magnet brake, may be implemented.

1 is a circuit diagram of a motor brake device using a conventional general magnet contact.

2 is a detailed circuit diagram of a contactless brake device according to the present invention.

3 is a time chart for explaining FIG.

4 is a view showing a detailed configuration of the IGBT element of FIG.

Explanation of symbols for the main parts of the drawings

10: power supply time control circuit 20: gate array logic

30: weak excitation voltage control circuit 40: IGBT driving circuit

50: OP amplifier 60: IGBT element

The present invention implements the use of an open collector type inverter and an RC circuit that uses a conventional timer to make a time delay of 0.5 to 1.2 [sec] when switching from a strong to a weak. In addition, the voltage transition from the strong to the weak is not limited to the voltage distribution by the resistance, but using the pulse width modulation (PWM) method of the OP AMP oscillator to control the voltage level freely It was. Finally, the logic for controlling the on-off time of the switching device was developed by combining the digital information implemented in the above description, and was actually implemented by using a GAL (Gate Array Logic).

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

FIG. 2 is a detailed circuit diagram of a DC magnet contactless device according to the present invention, which provides the exciter application time regulating circuit 10, GAL 20, and a weakly excited device of a contactless brake device to replace an existing timer. And a voltage regulating circuit 30, an IGBT driving circuit 40, and an IGBT element 60. The energizer applying time adjusting circuit 10 is composed of an open collector (OPEN COLLECTOR) type logic inverter (I1, I2 and I3) and a time delay circuit by the RC circuit, the operation of the circuit is as follows. First, when the switch S / W is OFF (MOTOR is stopped), the inputs of the logic inverters I1, I2 and I3 are 5 [V] by the resistors R10 and R11 and the capacitor C10. 0 [V]. When the switch S / W is turned ON (MOTOR operation), the input of the logic inverter becomes 0 [V] and the output is 0 [V] by charging the resistor R12 and the capacitor C9 at the output terminal. Increases exponentially toward 5 [V]. Since the voltage that TTL logic recognizes as logic [1] is more than 2.8 [V], the time that output voltage increases from 0 [V] to 2.8 [V] is the delay time. This delay is proportional to the time constant RC. In this case, if the resistance is 100 [OHM] and the capacitor is 33 [uF], the time delay of 0.8 [sec] can be obtained. If the value is adjusted, other time delay can be obtained, so the timer can be replaced.

The operation of the weak excitation voltage regulating circuit 30 is as follows.

First, when the output voltage of the OP amplifier AMP 50 is HIGH, the diode D6 is turned off and the voltage of the non-inverting input terminal (+) of the OP amplifier 50 is 3.3 due to the voltage distribution of the resistors R15 and R17. [V]. The voltage at the inverting input terminal (-) increases in the form of an exponential function that is charged to the capacitor C11 through the resistors R16 and R18. The time constant at this time is (R16 + R18) x C11. As soon as this voltage exceeds 3.3V, the output voltage goes LOW.

Next, when the output voltage of the OP amplifier 50 is LOW, the diode D6 is turned on and at this time, the voltage of the non-inverting input terminal (+) of the OP amplifier 50 is equal to the diode conduction voltage and the output terminal of the OP amplifier 50. 9.0 [V] plus Vce (on) voltage. At this time, the voltage of the inverting input terminal (-) becomes a waveform which decreases exponentially through the resistor R16 at an initial value of 3.3 [V]. At this time, the time constant is R16 × C11. As soon as this voltage is lower than 0.9 [V], the output voltage becomes HIGH.

As described above, the circuit generates a pulse at a constant cycle, and the pulse width can be converted by adjusting the values of the resistor R16 and the capacitor C11.

A GAL 20 implementing logic for controlling the on-off time of another contactless brake device according to the present invention will be described with reference to FIG. 3. First, if the input to implement logic is arranged, the E terminal is an input terminal that indicates whether the operation state is in the stop state and goes from HIGH to LOW when the switch (S / W) is turned on. The F terminal is an input terminal representing the inverse phase of the E terminal, and goes from LOW to HIGH after a time delay of 0.8 [sec]. The G terminal is a periodic pulse input terminal. The logic is briefly described as follows.

First, no action occurs when the switch S / W is turned off. That is, if the E terminal is logic '1', the output of Y2 is LOW as shown in Fig. 3, and the IGBT element (described later) is off. Immediately after the switch S / W is turned on, the IGBT element 60 should be turned on for 0.8 seconds to apply the inductor for 0.8 seconds. The switch (S / W) is in the ON state is the E terminal logic '0'. Therefore, the grantor logic is as follows.

Strong = E'F '

After the grantor approval time (0.8 seconds) has elapsed, enter the weak grantor logic. At this time, the IGBT element 60 repeats the on-off in the form of a pulse. In this state, since the F terminal is a logic '1', the G terminal may be used as a driving input of the IGBT element 60 as it is, and thus the weak excitation logic is as follows.

Weak girl (PWM) = FG

Therefore, the overall accreditation logic to sequentially approve the strong and weak is as follows.

Y2 = strong + weak (PWM) = E'F '+ FG

4 shows the detailed configuration of the IGBT element 60 and its operation is as follows.

The transistor Q4 is kept on by the control circuit 70 during the brake operation. In this state, if Y2 is HIGH, the transistor Q1 is turned on by the output of the IGBT driving circuit 40, and the magnet coil M becomes the energized state for 0.8 [sec], and after 0.8 [sec], the PWM is applied. Is converted into a weak girl. On the other hand, to turn off the brake, transistor Q4 is turned off, while Q4 is turned off, Y2 is kept on and consumed as heat through the accumulated energy resistance R of the magnet coil m. By repeating this operation, the magnet coil m is operated.

In a conventional brake device using a normal magnet contact, replacement is necessary due to wear and fusion of the contact when used for a long time. However, the use of a contactless brake device using the IGBT element according to the present invention can facilitate maintenance and management.

Claims (3)

A brake switch for controlling the operation of the motor, a first RC circuit for supplying a power voltage according to the operation of the brake switch, an inverter circuit for inverting and outputting a first output signal output from the first RC circuit, and And a second RC circuit for exponentially changing the magnitude of the second output signal output from the inverter circuit, wherein the second output signal is connected to the second RC circuit in accordance with the operation of the brake switch during operation of the motor. A donor application time control circuit for increasing exponentially by a time constant; A weak excitation voltage regulating circuit for generating a pulse periodically; Receiving the first output signal, the second output signal, and the pulse, and outputting a booster signal corresponding to a logical product of an inverse phase of the first output signal and an inverse phase of the second output signal during operation of the motor; A gate array logic configured to output a weak excitation signal corresponding to the logical product of the second output signal and the pulse; And The magnetic coil of the IGBT element is controlled to remain in the energized state while receiving the strong and weak excitation signals, and the magnetic coil is weakly excited while the weak excitation signal is activated. A magnet brake contactless device comprising an IGBT driving circuit for controlling to remain in a state. The method of claim 1, The inverter circuit is a magnet brake contactless device, characterized in that the open collector structure. The method of claim 1, The weak excitation voltage control circuit, An OP amplifier comprising first and second input terminals and comparing the signals input to the first and second input terminals and outputting the pulse periodically according to the signals; A pulse width modulation circuit comprising a first resistor fed back from the output terminal of the OP amplifier to the first input terminal and a capacitor connected between the first resistor and a ground terminal, the pulse width modulation circuit controlling a pulse width of the pulse; And A diode connected between an output terminal of the OP amplifier and the second input terminal, and a second and third resistors connected in parallel with an anode side of the diode, the amplitude control unit configured to determine the magnitude of the amplitude of the pulse; Magnet brake contactless device, characterized in that.