KR20010026032A - Electromagnatic Break Control Circuit for Elevator - Google Patents

Abstract

PURPOSE: A brake control circuit is provided to remove resistance portions for the electric power of an electromagnet typed brake, to reduce elevator failure, and to quicken the respond time of the brake. CONSTITUTION: A control circuit of an electromagnet typed brake comprises a DC(Direct Current) power supply supplying DC power to a circuit loop; an electronic contactor driving a brake coil; switching transistors(Q1,Q4) transferring the power passing through the electronic contactor to the brake coil from a positive pole to a negative pole; switching transistors(Q2,Q3) delivering the reversed power flow passing through the electronic contactor to the brake coil from the negative pole to the positive pole; and a controller enabling one circuit loop among the switching elements to be turned on by delaying time on the basis of the detected electric current signal. Thus, the electric current flowing on the electromagnet is quickly blocked without noise.

Description

Electromagnetic brake control circuit for elevators {Electromagnatic Break Control Circuit for Elevator}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric and electronic brake circuit for an elevator, and more particularly, to an electric and electronic brake circuit for an elevator, wherein the electric current flowing through the electromagnet at the time of electric interruption is cut off as quickly as possible without noise.

The conventional driving method of the elevator is to move the balance weight at the opposite end of the main car connected to the car and the car by the friction force between the friction sheave of the rope and the hoist.

This is the oldest way of modern elevators and has been the most used so far despite many problems.

The elevator brake is attached to the hoisting machine, and the structure of the hoisting machine is composed of an electric motor, a reducer, a brake device, and a shib. A recently used brake device is divided into various types,

The electromagnet consists of an electromagnet using the principle of electromagnet and a yoke which is a moving part composed of iron,

The hydraulic type is similar to a general hydraulic device, and is a system that rotates a hydraulic pump with an electric motor, generates oil pressure, and moves a brake device.

In the case of electromagnets, electric energy is used, so there are direct current and alternating current, and they are expressed as inductance energy converters.

Hereinafter, an example of a brake device developed as an electromagnet will be described with reference to the accompanying drawings.

1 is a three-phase power source, 3 is a motor drive device, 4 is a motor, 15 is an encoder attached to the motor, 11 is a control device, 53 is a brake drum device, 57 is a brake coil, 51 is a brake actuation spring, 56 Silver brake electromagnet yoke, 10 DC power, 9a brake drive contactor, 58 brake contact protection diode, 14 brake coil current sensor, 60 sheave device, 61 rope, 62 car, 63 counterweight, 54 Is a connecting shaft and 2a is a command device of the drive unit.

Looking at the characteristics of the brake made as described above, in the control of the elevator, the brake device is characterized in that the brake coil is generated when the energy of the brake coil is lost, the car of the elevator is stopped, the above brake is operated by a drive command In addition, by attaching a sensor for detecting a current to the brake coil to adjust the current to a predetermined value, the force acting to release the brake controls the car of the elevator similar to the rotational force driven by the motor.

The problem of the prior art as described above,

First, since the brake coil has a very high inductance value, there is a limit in completely eliminating the energy stored therein and reducing the yoke travel time.

Second, if the circuit is opened in the state where the internal current is applied to the inductance, the energy of 1 / 2LI ² accumulated in the electrical contact of the opened part is consumed and the contact burns, causing the electrical contact to be severely damaged, and the coil If the parallel resistance of is lowered, the heat generation in the steady state becomes larger and the volume of the resistance increases.

Third, if the contact with the resistor or additional signal, the circuit becomes complicated, and the resistance of the power is required continuously, which reduces the volume of the brake control circuit,

Fourth, as shown in FIG. 1, the attenuation circuit having a diode 58 or a resistor connected in series has a problem in that it takes time to move the yoke 56 by completely removing the current from the coil.

The present invention is made by removing the power resistance portion of the electromagnetic brake circuit for the elevator occupies a lot of space, which is a problem of the prior art, to minimize the consumption of the brake drive contact to eliminate the failure of the elevator, the brake response time as fast as possible It aims to do it.

As a means for achieving the above object,

The present invention provides a DC power supply for supplying DC power to the circuit loop,

An electronic contactor for driving the brake coil,

A switching transistor which transfers power through the electronic contactor to the brake coil, but transfers the flow of power from the positive side to the negative side;

A switching transistor which transfers power through the electronic contactor to the brake coil and transfers a reverse power flow from the negative side to the positive side;

And a controller for controlling to turn on only one circuit loop among the switching elements by delaying time based on the measured current signal.

1 is a configuration diagram of a conventional elevator control device.

2 is an open circuit model diagram of a conventional brake circuit.

3 is an open circuit model diagram of an improved brake circuit of the present invention.

4 is a configuration diagram of a brake circuit of the present invention.

Explanation of symbols on the main parts of the drawings

101: DC power supply 102: electronic contactor

103: brake coil 104: controller

105: resistance element

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

2 is a view illustrating an existing open circuit of a brake arc to facilitate understanding of the present invention. The brake coil 103 includes a current in a current I state at the moment of opening of a magnetic contactor, which corresponds to an equivalent resistance inside the coil and an external circuit. The resistance 105 attenuates the current in the form of a differential equation. The time constant at this time is in the form of R / L.

In FIG. 3, the damping time constant of the current is in the form of R / L as a model of the improved brake open circuit, and the damping time is shorter than that of FIG. 2. That is, the external resistance 5 shown in the conventional configuration is eliminated, and the amount forming R in the time constant is limited to only the internal resistance of the coil.

That is, since a general brake driving circuit uses an electronic contactor, there is an operation delay time of several 10 ms to several 100 ms. If there is a device for changing the polarity of the brake terminal voltage within such an operation delay time, the parallel resistance of the coil It shortens the time for dropping the current without it, and the dropping time of the current is the same as the time that the brake coil's current rises by operating the brake, and can be made sufficiently zero within a few 10ms to a few 100ms.

4 is a block diagram of the present invention, and is characterized by including a single-phase voltage type power converter composed of switching elements Q1, Q2, Q3, and Q4.

That is, the DC power supply 101 for supplying DC power to the circuit loop,

An electronic contactor 102 for driving the brake coil 103,

Switching transistors (Q1, Q4) for transmitting the power through the electronic contactor 102 to the brake coil 103, but the flow of power from the positive side to the negative side;

Switching transistors (Q2, Q3) for transmitting the power through the electronic contactor 102 to the brake coil 103, but transfers the flow of reverse power from the negative side to the positive side;

And a controller 104 which controls to turn on only one circuit loop among the switching elements by delaying time based on the measured current signal.

In FIG. 4, when a signal for opening the brake is output, a signal is applied to the switching transistors Q1 and Q2 constituting the power converter connected to the electronic contactor 102. At this moment, the voltage is 0 V on the DC side of the power converter. Therefore, when the magnetic contactor 102 is operated after a delay time without being operated, the DC contactor plus (+) side, the magnetic contactor plus (+) side, the switching transistor Q1, and the plus side of the brake coil are The circuit is formed on the negative side, the switching transistor Q4, the current detection resistor R and the magnetic contactor negative side, and the negative voltage side of the DC voltage source, and the switching transistor for a predetermined delay time by the current control circuit. The operation of Q3 is interrupted to suppress the current flowing.

In this case, the current of the brake coil is freewheeled through the path of the diode connected in parallel with the switching transistor Q1 and the brake coil and the transistor Q4.

After the delay time of the current control circuit, the switching transistor Q3 is turned on again to increase the current of the brake coil and to control it constantly.

When the brake drive command is interrupted, the operation of the switching transistors Q1 and Q4 is immediately interrupted, and the brake contactor has a delay time of several tens of ms or more, and the switching transistors Q2 and Q3 are turned on at the same time after several us time delays. In the brake coil, a circuit loop is formed of a DC voltage source, an electromagnetic contactor, a switching transistor (Q2), a negative side of the brake coil, a positive side, a switching transistor (Q3), a current detecting resistor and an electromagnetic contactor, and a DC voltage source. Voltage is applied.

The circuit operates only during this magnetic contactor delay time.

In this case, if the magnetic contactor moves too fast to operate with a non-zero coil current, or if the magnetic contactor moves too slowly to make the coil current slightly smaller, current flows through the diode path connected in parallel to Q2 and Q3.

Therefore, using the present invention provides an effect of blocking the current flowing in the electromagnet at the time of the electric cutoff without noise as quickly as possible.

Claims (1)

DC power supply 101 for supplying DC power to the circuit loop, An electronic contactor 102 for driving the brake coil 103, Switching transistors (Q1, Q4) for transmitting the power through the electronic contactor 102 to the brake coil 103, but the flow of power from the positive side to the negative side; Switching transistors (Q2, Q3) for transmitting the power through the electronic contactor 102 to the brake coil 103, but transfers the flow of reverse power from the negative side to the positive side; And a controller (104) for controlling to turn on only one circuit loop of the switching elements by delaying time based on the measured current signal.