KR20080089587A - Brake system of elevator - Google Patents

Abstract

A brake system of an elevator comprising a brake system body having a brake coil, and a discharge circuit connected in parallel with the brake coil. The brake system body applies a brake force to a cage by stopping power supply to the brake coil, and releases brake force applied to the cage by supplying power to the brake coil. The discharge circuit attenuates the current of the brake coil when power supply to the brake coil is stopped. The discharge circuit has a discharge parallel portion including a resistor, and an overvoltage absorption element connected in parallel with the resistor and sustaining a voltage applied to the resistor within a predetermined range.

Description

Brake System for Elevators {BRAKE SYSTEM OF ELEVATOR}

The present invention relates to an elevator brake device for imparting braking force to a car.

In order to prevent the operation delay of a brake conventionally, the brake control apparatus of the elevator which connected the discharge circuit for attenuating the electric current of a brake coil in parallel with the brake coil is proposed. A discharge circuit is comprised by the parallel circuit of a resistor and a capacitor. When the feeding to the brake coil is stopped, resonance occurs in a circuit including the brake coil, the capacitor and the resistor. As a result, the current of the brake coil is attenuated in a shorter time than when the capacitor is not included in the discharge circuit (see Patent Document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 2003-81543

However, since the damping rate of the current of the brake coil is determined by the inductance and resistance of the brake coil, the damping rate of the current becomes slower as the current of the brake coil decreases. Therefore, it becomes difficult to further prevent the operation delay of the brake.

This invention is made | formed in order to solve the above subjects, and an object of this invention is to obtain the elevator brake apparatus which can shorten the time until the braking force is given to a cage | basket | car after power supply to a brake coil is stopped.

The brake device of an elevator according to the present invention has a brake coil, applies braking force to a car by stopping power supply to the brake coil, and releases the braking force applied to the car by supplying power to the brake coil. Brake device body; And a discharge circuit connected in parallel to the brake coil and configured to attenuate the current of the brake coil when the feeding of the brake coil is stopped, the discharge circuit being connected in parallel to the resistor and applying a voltage applied to the resistor. It has a discharge parallel part containing an overvoltage absorbing element for maintaining in a predetermined range.

BRIEF DESCRIPTION OF THE DRAWINGS It is a typical block diagram which shows the elevator provided with the brake apparatus by Embodiment 1 of this invention.

FIG. 2 is a circuit diagram illustrating the brake control device and the brake coil of FIG. 1.

3 is a graph illustrating electrical characteristics of the constant voltage diode of FIG. 2.

4 is a graph illustrating a temporal change in voltage generated in the resistance after power supply to the brake coil of FIG. 2 is stopped.

FIG. 5 is a graph illustrating a temporal change in current of a brake coil after power supply to the brake coil of FIG. 2 is stopped.

FIG. 6 is a graph showing a temporal change in the speed of the car after power supply to the brake coil of FIG. 2 is stopped.

It is a typical block diagram which shows the elevator provided with the brake apparatus by Embodiment 2 of this invention.

FIG. 8 is a circuit diagram illustrating each brake coil and first and second brake control devices of FIG. 7.

FIG. 9 is a graph illustrating a temporal change of voltages generated in each of the first and second resistors after power supply to each brake coil of FIG. 8 is stopped.

FIG. 10 is a graph illustrating a temporal change of current of each brake coil after power supply to each brake coil of FIG. 8 is stopped.

FIG. 11 is a graph showing a temporal change in the speed of the car after power supply to each brake coil of FIG. 8 is stopped.

12 is a graph showing the temporal change of voltages generated in each of the first and second resistors after the power supply to each brake coil is stopped in the brake device of the elevator according to the third embodiment of the present invention.

Fig. 13 is a graph showing the temporal change of the current of each brake coil after the power supply to each brake coil is stopped in the brake device of the elevator according to the third embodiment of the present invention.

Fig. 14 is a circuit diagram of a main part showing a brake device for an elevator according to Embodiment 4 of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described with reference to drawings.

Embodiment 1.

BRIEF DESCRIPTION OF THE DRAWINGS It is a typical block diagram which shows the elevator provided with the brake apparatus by Embodiment 1 of this invention. In the figure, the cage | basket | car 2 and the counterweight 3 are provided in the hoistway 1 so that the hoistway can be hoisted. In the upper part of the hoistway 1, the hoisting machine 4 for elevating the cage | basket | car 2 and the counterweight 3 is provided. The hoist 4 has a hoist main body 5 including a motor, and a drive sheave 6 rotated by the hoist main body 5. The drive sheave 6 is wound with a plurality of main ropes 7 which hang the car 2 and the counterweight 3. The car 2 and the counterweight 3 move up and down the hoistway 1 by the rotation of the drive sheave 6.

The rotation of the drive sheave 6 is braked by the brake device 8. The brake device 8 includes a rotating body 9 that rotates together with the drive sheave 6, a brake device main body 10 mounted on the hoisting body 5, for applying a braking force to the rotating body 9, A brake control device 11 for controlling the operation of the brake device main body 10 is provided. The brake control apparatus 11 is mounted in the control panel 12 of the elevator provided in the hoistway 1.

The brake device main body 10 includes a braking body 13 which is foldable with respect to the rotating body 9, and a pressurizing spring 14 which presses the braking body 13 in a direction contacting the rotating body 9. And an electromagnetic magnet 15 for displacing the brake body 13 in a direction away from the rotor 9 in response to the pressing force of the pressure spring 14.

The electromagnetic magnet 15 has a magnet main body (iron core) 16 and a brake coil 17 formed in the magnet main body 16. The electromagnetic magnet 15 generates an electromagnetic attraction force by feeding power to the brake coil 17.

When the power supply to the brake coil 17 is stopped, the braking body 13 is displaced in the direction contacting the rotating body 9 by the pressing force of the pressure spring 13. The braking force is given to the cage | basket | car 2 and the counterweight 3 by the braking body 13 contacting the rotating body 9. In addition, when the braking body 13 is fed to the brake coil 17, the braking body 13 is displaced in a direction away from the rotating body 9 by the generation of the electromagnetic attraction force of the electromagnetic magnet 15. The braking force applied to the car 2 and the counterweight 3 is released by the brake body 13 falling from the rotor 9.

FIG. 2 is a circuit diagram illustrating the brake control device 11 and the brake coil 17 of FIG. 1. In the figure, the brake control device 11 controls the power feeding from the power supply 18 to the brake coil 17. In addition, the brake control device 11 is connected in parallel with the brake coil 17, the discharge circuit 19 for attenuating the current of the brake coil 17 when the power supply to the brake coil 17 is stopped, and the brake coil The first contact 20 for opening and closing the electrical connection between each of the 17 and the discharge circuit 19 and the anode of the power supply 18, and each of the brake coil 17 and the discharge circuit 19 and the power supply 18. It has the 2nd contact 21 which opens and closes the electrical connection between cathodes.

The discharge circuit 19 is connected in series with the discharge parallel part 22 and the discharge parallel part 22, and has the diode 23 for flowing an electric current in a predetermined direction. The discharge parallel part 22 is connected to the resistor 24 and the resistor 24 in parallel, and has a constant voltage diode (overvoltage absorbing element) 25 for maintaining the voltage applied to the resistor 24 within a predetermined range. .

3 is a graph showing electrical characteristics of the constant voltage diode 25 of FIG. 2. As shown in the figure, when the reverse voltage is applied to the constant voltage diode 25, the amount of current flowing through the constant voltage diode 25 is extremely small when the reverse voltage is smaller than the predetermined drop voltage, whereas the reverse voltage If it exceeds this predetermined drop voltage, it will increase rapidly. That is, the constant voltage diode 25 has a characteristic in that it is difficult to flow a current when the reverse voltage is smaller than the predetermined drop voltage, and the current easily flows rapidly when the reverse voltage becomes more than the predetermined drop voltage. The constant voltage diode 25 is set to be the maximum allowable current when the voltage in the reverse direction becomes a predetermined clamp voltage value higher than the drop voltage. The clamp voltage value of the constant voltage diode 25 is an upper limit value that is permitted in terms of circuit protection of the brake device 8.

That is, when the reverse voltage applied to each of the resistor 24 and the constant voltage diode 25 exceeds the clamp voltage value, current flows through the constant voltage diode 25. As a result, the voltage applied to the resistor 24 is maintained within a predetermined range below the clamp voltage value. That is, the constant voltage diode 25 prevents the reverse voltage applied to the resistor 24 and the constant voltage diode 25 from exceeding the clamp voltage value.

When the cage | basket | car 2 and the counterweight 3 are moved, the 1st and 2nd contact points 20 and 21 are closed and power feeding to the brake coil 17 is performed. In addition, when stop holding or emergency stop of the cage | basket | car 2 and the counterweight 3 is performed, the 1st and 2nd contact points 20 and 21 will open, and the electric power supply to the brake coil 17 will be stopped.

Next, the operation will be described. When the cage | basket | car 2 and the counterweight 3 are moving, the electric power feeding from the power supply 18 to the brake coil 17 is performed by the brake control apparatus 11. At this time, the braking body 13 is separated from the rotating body 9, and the braking force applied to the cage | basket | car 2 and the balance weight 3 is released.

For example, when the car 2 is urgently stopped, power supply from the power supply 18 to the brake coil 17 is stopped by the brake control device 11. At this time, a surge voltage is generated in the resistor 24 so that a current of the brake coil 17 flows through the discharge circuit 19.

4 is a graph showing a temporal change in voltage generated in the resistor 24 after the power supply to the brake coil 17 of FIG. 2 is stopped. 5 is a graph showing the temporal change of the current of the brake coil 17 after the power supply to the brake coil 17 of FIG. 2 is stopped.

As shown in the figure, the surge voltage 31 generated in the resistor 24 until the time X passes from when the power supply to the brake coil 17 is stopped (feed stop time A) is passed to the constant voltage diode 25. By the predetermined clamp voltage value. That is, when the surge voltage 31 exceeds the clamp voltage value, the current flowing through the constant voltage diode 25 is automatically adjusted to maintain the predetermined clamp voltage value (Fig. 4). This prevents damage to the first and second contacts 20 and 21, the power source 18 and the like. At this time, a large amount of current flows through the resistor 24, and the current of the brake coil 17 (hereinafter, simply referred to as "brake current" 32) is rapidly attenuated (FIG. 5).

Thereafter, the surge voltage 31 continuously decreases from the clamp voltage value, and the brake current 32 also attenuates continuously by flowing the resistor 24. Thereby, the electron attraction force of the electron magnet 15 falls. Thereafter, when the electromagnetic attraction force of the electromagnetic magnet 15 is smaller than the pressing force of the pressure spring 14, the brake body 13 is displaced from the electromagnetic magnet 15 and is displaced toward the rotor 9 side. After that, when the braking body contacting time B (FIG. 5) is reached, the braking body 13 abuts on the rotating body 9.

Thereafter, the brake current 32 is further attenuated to increase the pushing force against the rotating body 9 of the brake body 13. Thereby, a braking force is given to the rotating body 9, and a braking force is given to the cage | basket | car 2 and the counterweight 3.

4 also shows the temporal change of the surge voltage (hereinafter referred to as "comparison surge voltage") 33 generated in the resistance when the discharge parallel part 22 of FIG. 5 also shows the temporal change of the current of the brake coil 17 (hereinafter referred to as "comparison brake current" 34) when the discharge parallel part 22 of FIG.

In order to prevent the occurrence of excessive surge voltage when the discharge parallel part 22 is only a resistor, the resistance value of the resistor is set lower than the resistance value of the resistor 24 when connected in parallel to the constant voltage diode 25. do.

The time from the power supply stop time A until the attenuation of the surge voltage 31 is completed is shorter than the time from the power supply stop time A until the attenuation of the comparison surge voltage 33 is completed. Moreover, the time from the power supply stop time A until the attenuation of the brake current 32 is completed is shorter than the time from the power supply stop time A until the attenuation of the comparative brake current 34 is completed. Therefore, the brake body 13 abuts against the rotor 9 earlier than the case where the discharge parallel portion 22 shown in FIG. The braking force given in 2) occurs early.

6 is a graph showing the temporal change of the speed of the car 2 (hereinafter simply referred to as "elevator car speed" 35) after the power supply to the brake coil 17 of FIG. 2 is stopped. As shown in the figure, at the power supply stop time A, the power supply to the motor of the hoisting machine main body 5 (FIG. 1) is also stopped, so that the cage speed 35 temporarily increases. Thereafter, the braking force is applied to the car 2 by the operation of the brake device main body 10. Thereby, the cage | basket | car speed 35 falls continuously and the cage | basket | car 2 stops.

In FIG. 6, in order to compare the time until the cage | basket | car 2 stops, the speed | rate of the cage | basket | car 2 when the discharge parallel part 22 of FIG. The temporal change of 36 is also shown. As shown in the figure, it is understood that the car speed 35 is changed to deceleration at a time faster than the comparison car speed 36. Therefore, the time from the power supply stop time A until the cage | basket | car 2 stops is shorter than the case where the discharge parallel part 22 shown in FIG. 2 is applied than the discharge parallel part only resistance. .

In such a brake device of an elevator, the discharge circuit 19 connected in parallel to the brake coil 17 has a discharge parallel portion 22, and the resistor 24 and the constant voltage diode ( Since 25 is provided, the surge voltage generated in the resistor 24 when the power supply to the brake coil 17 is stopped can be maintained within the predetermined range by the constant voltage diode 25. Therefore, the resistance value of the resistor 24 can be set large, and the current of the brake coil 17 can be attenuated in a shorter time. Thereby, the braking body 13 can be displaced early. Therefore, the time from when the power supply to the brake coil 17 is stopped and the braking force is given to the cage | basket | car 2 can be shortened.

Embodiment 2.

It is a typical block diagram which shows the elevator provided with the brake apparatus by Embodiment 2 of this invention. In the drawing, the brake device 8 is a rotating body 9 which is rotated together with the drive sheave 6, and is mounted on the hoisting machine main body 5, respectively, and is provided for applying braking force to the common rotating body 9, respectively. The first and second brake device bodies (that is, a plurality of brake device bodies; 41, 42), a first brake control device 43 for controlling the first brake device body 41, and a second brake device body ( A second brake control device 44 for controlling 42 is provided. The 1st and 2nd brake system main bodies 41 and 42 are the same as the structure of the brake system main body 10 (FIG. 1) of Embodiment 1. As shown in FIG. In addition, the first and second brake control devices 43 and 44 are mounted on the control panel 12.

FIG. 8 is a circuit diagram illustrating each brake coil 17 and first and second brake control devices 43 and 44 of FIG. 7. In the figure, the first and second brake control devices 43 and 44 are connected to a common power source 18. The first and second brake control devices 43 and 44 individually control power feeding from the power source 18 to each brake coil 17. The configurations of the first and second brake control devices 43 and 44 are the same as those of the brake control device 11 (FIG. 2) of the first embodiment except for the discharge parallel units 22.

The discharge circuit 19 of the first brake control device 43 is connected in parallel to one brake coil 17, and the discharge circuit 19 of the second brake control device 44 connects to the other brake coil ( 17) is connected in parallel. In other words, the discharge circuits 19 of the brake control devices 43 and 44 are individually connected in parallel to the respective brake coils 17.

The discharge parallel part 22 of the 1st brake control apparatus 43 has the 1st resistor 45 and the 1st constant voltage diode (overvoltage absorbing element) 46 connected in parallel with the 1st resistor 45. As shown in FIG. Moreover, the discharge parallel part 22 of the 2nd brake control apparatus 44 has the 2nd resistor 47 and the 2nd constant voltage diode (overvoltage absorbing element) 48 connected in parallel with the 2nd resistor 47. As shown in FIG. have.

The resistance values of the first and second resistors 45 and 47 are the same. Further, the clamp voltage values of the first and second constant voltage diodes 46 and 48 are different from each other. That is, the predetermined range in which the voltage is maintained by each of the first and second constant voltage diodes 46 and 48 is different from each other. In this example, the clamp voltage value V1 of the first constant voltage diode 46 is set lower than the clamp voltage value V2 of the second constant voltage diode 48. Another configuration is the first embodiment and Orient.

Next, the operation will be described. When the cage | basket | car 2 and the counterweight 3 are moving, electric power feeding from the power supply 18 to each brake coil 17 is performed separately by the 1st and 2nd brake control devices 43 and 44. FIG. Thereby, all the brake bodies 13 are separated from the rotating body 9, and the braking force given to the cage | basket | car 2 and the counterweight 3 is canceled | released.

For example, when the car 2 is urgently stopped, power is supplied from the power source 18 to each brake coil 17 by the operation of the first and second contacts 20 and 21 of each brake control device 11. This stops at the same time. At this time, a surge voltage is generated in each of the first and second resistors 45 and 47, and a current of each brake coil 17 flows to each of the discharge circuits 19, respectively.

FIG. 9 is a graph showing a temporal change of each voltage generated in each of the first and second resistors 45 and 47 after power supply to each brake coil 17 of FIG. 8 is stopped. 10 is a graph showing the temporal change of the current of each brake coil 17 after the power supply to each brake coil 17 in FIG. 8 is stopped.

As shown in the figure, when the power supply to each brake coil 17 is stopped at the power supply stop time A at the same time, the surge voltage generated in the first resistor 45 (hereinafter referred to as "first surge voltage") 49 The clamp voltage value V1 is maintained by the first constant voltage diode 46, and the surge voltage (hereinafter referred to as "second surge voltage" 50) generated in the second resistor 47 is controlled by the second constant voltage diode 48. The clamp voltage value V2 is maintained (Fig. 9). At this time, the current of one brake coil 17 (hereinafter referred to as "first brake current") 51 flows through the first resistor 45 and the current of the other brake coil 17 (hereinafter referred to as " 2 brake current ”; 52 flows through the second resistor 47. As a result, the first and second brake currents 51 and 52 are rapidly attenuated (Fig. 10). Thereafter, the first and second surge voltages 49 and 50 are continuously lowered, and the first and second brake currents 51 and 52 are also continuously attenuated.

The time X1 at which the first surge voltage 49 is held at the clamp voltage value V1 is the time at which the second surge voltage 50 is held at the clamp voltage value V2 because the clamp voltage value V1 is set lower than the clamp voltage value V2. Longer than X2 As a result, the second brake current 52 is attenuated in a shorter time than the first brake current 51.

Therefore, after the brake body 13 of the 2nd brake apparatus main body 42 is separated from the electromagnetic magnet 15, the brake body 13 of the 1st brake apparatus main body 41 will fall from the electromagnetic magnet 15. As shown in FIG. Thereafter, each of the brake bodies 13 abuts on the rotor 9 at different brake body contacting times B and B ', respectively. That is, each brake body 13 mutually shifts and contacts the common rotating body 9 in time. After this, the first and second brake currents 51 and 52 are attenuated and the braking force is applied to the car 2.

9 also shows the temporal change of the surge voltage (hereinafter referred to as "comparative surge voltage" 53) generated in each resistor when the discharge parallel units 22 in FIG. 10 also shows the temporal change of the current of the brake coils 17 (hereinafter referred to as "comparison brake current" 54) when the discharge parallel part 22 of FIG. When the discharge parallel part 22 is made into only a resistance, the resistance value of a resistance becomes the same as the resistance value of the 1st and 2nd resistors 45 and 47. Therefore, when the discharge parallel part 22 is used as the resistance only, at the power supply stop time A, the voltage applied to the resistance becomes a voltage value V3 higher than the respective clamp voltage values V1 and V2.

As shown in the figure, the time from the power supply stop time A until the attenuation of the first and second brake currents 51 and 52 is completed, the attenuation of the comparative brake current 54 from the power supply stop time A is completed. It is shorter than the time until. Therefore, the brake body 13 abuts against the rotor 9 earlier than the case where the discharge parallel part 22 shown in FIG. 8 applies the discharge parallel part only resistance. The braking force given in 2) occurs early.

11 is a graph which shows the temporal change of the speed of the cage | basket | car 2 (henceforth simply "elevator cage | bowl speed" 55) after electric power supply to each brake coil 17 of FIG. 8 is stopped. As shown in the figure, the car speed 55 temporarily rises and then continuously decreases due to the braking force being applied to the car 2.

In FIG. 11, in order to compare the time until the cage | basket | car 2 stops, the clamp voltage value V1 of the 1st constant voltage diode 46 of FIG. 8 is equal to the clamp voltage value V2 of the 2nd constant voltage diode 48. In FIG. When the speed 56 of the cage | basket | car 2 and each discharge parallel part 22 of FIG. 8 are only resistances, the temporal change of each speed 57 of the cage | basket | car 2 is also shown.

As shown in the figure, the time from the power supply stop time A until the car 2 is stopped is a case where the clamp voltage values of the first and second constant voltage diodes 46 and 48 are both V2 (speed waveforms). (56), when the first constant voltage diode 46 becomes the clamp voltage value V1 and the second constant voltage diode 48 becomes the clamp voltage value V2 (speed waveform 55), and each discharge parallel part 22 ) Is long only in the order of resistance (speed waveform 57).

In the brake device of such an elevator, the discharge circuits 19 are individually connected in parallel to the respective brake coils 17 of the plurality of brake device main bodies 41, 42, and the discharge parallel portions of the respective discharge circuits 19 ( 22 has first and second constant voltage diodes 46 and 48 having different clamp voltages, respectively, so that the first and second brake device main bodies 41, 42) can be controlled. Thereby, the generation | occurrence | production time of the braking force applied to the rotating body 9 can be moved between the 1st and 2nd brake apparatus main bodies 41 and 42, and the impact to the cage | basket | car 2 can be suppressed.

Embodiment 3.

In the second embodiment, the resistance values of the first and second resistors 45 and 47 are the same, but the resistance values of the first and second resistors 45 and 47 may be different from each other.

In this example, the resistance value R1 of the first resistor 45 is set larger than the resistance value R2 of the second resistor 47. In addition, the first and second constant voltage diodes 46 and 48 are set to the same clamp voltage value V. FIG. The other configuration is the second embodiment and Orient.

FIG. 12 shows the temporal change of voltages generated in each of the first and second resistors 45 and 47 after power supply to each brake coil 17 is stopped in the brake device of the elevator according to Embodiment 3 of the present invention. It is a graph. 13 is a graph which shows the temporal change of the electric current of each brake coil 17 after power supply to each brake coil 17 is stopped in the brake apparatus of the elevator by Embodiment 3 of this invention.

As shown in the figure, when the power supply to each brake coil 17 is stopped simultaneously at the power supply stop time A, a surge voltage generated in the first resistor 45 (hereinafter referred to as "first surge voltage") 61, The surge voltage (hereinafter referred to as "second surge voltage") 62 generated in the second resistor 47 is maintained at the clamp voltage value V. At this time, the current of one brake coil 17 (hereinafter referred to as “first brake current” 63) flows through the first resistor 45, and the current of the other brake coil 17 (hereinafter referred to as “the first brake current” 63). 2 brake currents ”; 64 flows through the second resistor 47. As a result, the first and second brake currents 63 and 64 abruptly attenuate.

Since the resistance value R1 of the first resistor 45 is set larger than the resistance value R2 of the second resistor 47, the time Y1 at which the first surge voltage 61 is held at the clamp voltage value V is the second surge voltage. It becomes longer than the time Y2 which 62 maintains the clamp voltage value V. FIG. As a result, the first brake current 63 is attenuated in a shorter time than the second brake current 64. Thus, after the brake 13 of the first brake device main body 41 is separated from the electromagnetic magnet 15, the brake 13 of the second brake device main body 42 is separated from the electromagnetic magnet 15. Each braking member 13 away from the electromagnetic magnet 15 abuts on the rotating body 9 at different braking body contacting times B and B ', respectively. The subsequent operation is the same as that of the second embodiment.

In the brake device of such an elevator, since the resistance values R1 and R2 of the first and second resistors 45 and 47 are different from each other, the first and second brake devices determine when the braking force applied to the rotor 9 is generated. It can move between the main bodies 41 and 42, and the impact to the cage | basket | car 2 can be suppressed.

In the above example, the clamp voltage values of the first and second constant voltage diodes 46 and 48 are the same, but as in the second embodiment, the clamps of the first and second constant voltage diodes 46 and 48 are the same. The voltage values may be different.

Embodiment 4.

It is a principal part circuit diagram which shows the brake device of the elevator by Embodiment 4 of this invention. In the figure, the discharge circuit 19 has a plurality of discharge parallel units 22 and diodes 23 connected in series with each other. Each of the discharge parallels 22 and the diodes 23 has the same configuration as that of the discharge parallels 22 and the diodes 23 of the first embodiment. Another configuration is the first embodiment and Orient.

In the brake device of such an elevator, since the plurality of discharge parallel units 22 are connected in series with each other, even if some of the discharge parallel units 22 are damaged, the brakes are operated by the remaining normal discharge parallel units 22. The current of the coil 17 can be attenuated, so that the attenuation of the current of the brake coil 17 can be extremely slowed down. That is, when there is only one discharge parallel part 22, for example, when the constant voltage diode 25 breaks open, a high voltage is applied to the circuit, and when the constant voltage diode 25 breaks short, the brake coil 17 Although a problem arises that the attenuation of the current is delayed, it is possible to prevent the occurrence of such inconvenience by using the plurality of discharge parallel parts 22.

According to the present invention, it is possible to provide an elevator brake device that can shorten the time from when the power supply to the brake coil is stopped until the braking force is applied to the car.

Claims (4)

A brake device main body having a brake coil, which applies a braking force to the car by stopping power supply to the brake coil, and releases the braking force applied to the car by supplying power to the brake coil; and A discharge circuit connected to the brake coils in parallel and configured to attenuate the current of the brake coils when power supply to the brake coils is stopped; And said discharge circuit has a discharge parallel portion comprising a resistor and an overvoltage absorbing element connected in parallel to said resistor and for maintaining a voltage applied to said resistor within a predetermined range. The method according to claim 1, A plurality of said brake device bodies, and And a plurality of said discharge circuits individually connected in parallel with each said brake coil of each said brake device main body, The predetermined range in which the voltage is maintained by each of the overvoltage absorbing elements is different from each other. The method according to claim 1, A plurality of said brake device bodies, and And a plurality of said discharge circuits individually connected in parallel with each said brake coil of each said brake device main body, Brake apparatus of the elevator, characterized in that the resistance value of each of the resistance is different. The method according to claim 1, And said discharge circuit has a plurality of said discharge parallel parts connected in series with each other.

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