JP4607631B2 - Brake control device for elevator - Google Patents

Description

  The present invention relates to an elevator brake control device that obtains a braking force by pressing a braking piece against a brake drum.

  2. Description of the Related Art Conventionally, elevator brake control devices that obtain braking force by pressing a braking piece against a brake drum are well known. In this type of brake control device, the electromagnetic coil (DC electromagnet) is energized or cut off according to the command when the brake is released or when the brake is applied or from when the brake is released to when the brake is applied. It has been proposed to drive a braking piece (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

Further, a rail vehicle braking method (for example, see Patent Document 4), a general electromagnetic brake braking method (for example, Patent Document 5), and a DC power supply adjustment method (for example, Patent Document 6) are proposed. ing.
JP 2004-115203 A JP 09-2267982 A Japanese Patent Application Laid-Open No. 06-200961 JP 09-58469 A JP 2002-13567 A Japanese Patent Laid-Open No. 06-169564

  The elevator brake control device proposed in Patent Document 1 is such that the elevator car and the counterweight are driven up and down by a linear motor, and the brake is released and added by the brake device provided on the counterweight to start and stop running. Is done. That is, this brake device presses the guide rail with a spring force to apply braking, supplies a current to the coil of the electromagnet and performs electromagnetic attraction against the spring force, releases the holding pressure of the guide rail, and releases the brake. The principle of operation is as follows.

  As shown in FIG. 11 of Japanese Patent Application Laid-Open No. 2004-228561, the braking release and the braking addition operation are normally performed by supplying and cutting off the power supply to the coil of the electromagnet. When current begins to flow through the electromagnetic coil due to energization (braking release operation), the gap between the electromagnet and the movable piece is gradually narrowed from the start of coil current supply. At this time, since the magnetic flux generated by the coil current increases in inverse proportion to the square of the gap, the gap suddenly narrows in the middle of the approach of the movable piece to the electromagnet, and the electromagnet and the movable piece come into contact instantaneously. Since the magnetic resistance of the magnetic circuit decreases after the moving piece is attracted to the electromagnet, an electromagnetic attractive force that overcomes the spring force is generated even if the exciting current flowing through the electromagnetic coil is small. To reduce suction and hold.

  After that, when the current value is reduced to zero by turning off the power supply (braking addition operation), the coil current decreases with a predetermined time constant, so the gap between the electromagnet and the movable piece begins to slowly open, but the same as when releasing the braking. Because of this, the gap suddenly opens from the middle, so that the braking piece is suddenly pressed against the brake drum by this rapid operation.

  As described above, when the braking piece suddenly operates at the time of releasing the brake and applying the braking, the collision noise of the movable piece to the electromagnet side and the collision noise of the braking piece to the brake drum increase, which is inconvenient for passengers in the car. It gives a pleasant feeling. Among them, the collision sound at the time of braking release can be reduced relatively easily by providing a shock absorbing material such as elastic rubber on the electromagnet side, for example. Since it is not possible to provide a buffer material or the like on the contact surface, it is difficult to eliminate it.

  In particular, because the machine room at the top of the hoistway has been omitted and the hoisting machine itself has been installed in the hoistway, the brake collision sound has become more prominent as car interior noise. .

  Therefore, in order to suppress such a collision noise at the time of brake release and addition, in the conventional coil current control (see FIG. 2 of Patent Document 1), when a brake release command is first received, the command value of the coil current is set. A ramp-like (gradual increase pattern) current command is output, and the suction force acting on the movable piece is gradually increased by gradually increasing the coil current. Thereby, the gap between the electromagnet and the movable piece is slowly narrowed, the speed at which the movable piece collides with the electromagnet is reduced, and the sound is reduced. Similarly, when a braking addition command is received, the coil current is gradually reduced in a ramp shape to slowly move the movable piece away from the electromagnet, and then the coil current is gradually increased to prevent the gap between the movable pieces from opening suddenly. . As a result, when the movable piece and the brake piece approach the brake drum, the electromagnetic attractive force increases, so that the collision speed when the brake piece comes into contact with the brake drum can be suppressed, and a method of reducing the collision noise is provided. Proposed.

  However, in the conventional method of Patent Document 1, a method of gradually decreasing the coil current to a specified value and then gradually increasing the coil current when braking is applied (see FIG. 2 of Patent Document 1) is employed. When there is an abnormality, there is a problem that the brakes continue to increase gradually, the braking cannot be applied, the braking is released, and the elevator cannot be stopped. Therefore, if a prevention means for preventing this is added, there is a problem that the coil current control circuit becomes complicated. Further, at the time of brake release (see FIG. 2 of Patent Document 1), the coil current is gradually increased to a specified value in a ramp shape, so that the brake release operation is delayed and the start of elevator travel is delayed.

  The electromagnetic brake proposed in Patent Document 2 is used in an elevator hoisting machine, and is braked by pressing a braking piece with a spring force against a brake drum provided on a rotating shaft of the hoisting machine. By supplying a current to the coil, the movable piece integrated with the brake piece is attracted against the spring force, the brake drum is released and the brake is released.

  However, in the conventional method of Patent Document 2, a method is adopted in which the coil current is set to zero and then increased when braking is applied (see FIG. 3 of Patent Document 2). Although an upper limit position reference value for preventing the coil current from continuing to increase is set, there is a problem that the coil current control circuit becomes complicated as in the case of Patent Document 1.

  The electromagnetic brake proposed in Patent Document 3 is used in an elevator hoisting machine, and is braked by pressing a braking piece with a spring force against a brake drum provided on a rotating shaft of the hoisting machine. By supplying a current to the coil, the movable piece integrated with the brake piece is attracted against the spring force to release the brake drum restraint and release the brake. However, no consideration is given to the reduction of collision noise when braking is applied.

  In addition, the braking device for the rail transport vehicle proposed in Patent Document 4 shows a braking method when braking is applied (see FIGS. 2 and 3 of Patent Document 4), and prevents the impact of the rail transport vehicle when braking is applied. Therefore, the braking force is controlled to be gradually increased from small to large, which is different from the prevention of operation collision noise of the elevator brake device.

  In addition, the electromagnetic brake control method proposed in Patent Document 5 calculates a coil inductance by applying a high-frequency voltage to an electromagnetic coil in order to prevent mechanical noise generation during brake opening / closing operation and shorten the operation time. According to the change, the coil current is gradually controlled to increase and decrease gradually when braking is released and brake is applied (see FIG. 4 of Patent Document 5). Since the current is controlled to increase gradually, there is a problem that the braking release operation is delayed and the start of the elevator is delayed.

  A surge absorber circuit for an AC GTO voltage regulator circuit proposed in Patent Document 6 is a surge absorber circuit for a circuit using a GTO for voltage regulation of an AC power source in a gyrotron oscillator power source. Different from the excitation circuit.

  An object of the present invention is to provide an elevator brake control device capable of reducing brake collision noise without causing an operation delay when braking is released and without gradually increasing the coil current when braking is applied.

  Another object of the present invention is to provide an elevator brake control device having a simple coil current control circuit.

  Another object of the present invention is to provide an elevator brake control device capable of reducing the capacity of a switching element.

To achieve the above object, the present onset Ming, a hoisting motor which drives the raising or lowering of the car-ride the elevator, a brake drum provided on the hoist motor, the braking force by pressing against the brake drum The generated brake piece, the brake spring for pressing the brake piece toward the brake drum, the movable piece connected to the brake piece, and sucking the movable piece against the urging force of the spring for braking In an elevator brake control device comprising an electromagnetic coil that constitutes an electromagnet for releasing and a coil current exciting circuit for causing current to flow through the electromagnetic coil, the coil current exciting circuit has a coil current at the initial stage of braking release. A brake release acceleration circuit to be applied, current detection means for detecting the current of the electromagnetic coil, coil current instruction means for instructing the current to flow through the electromagnetic coil, A coil current control circuit comprising coil current control means for controlling the current of the electromagnetic coil by inputting a command value of the coil current command means and a detection value of the current detection means; The coil current control circuit is energized stepwise, and after a certain period of time, the brake release acceleration circuit is deactivated to maintain the brake release by the current of the coil current control circuit. Gives a command to hold the coil current so as to stop the operation of the movable piece at a midway position between the position where the movable piece or the braking piece comes into contact with the brake drum from the position near the start of displacement. It is characterized in that the current is gradually decreased .

With this configuration, the coil current command is given stepwise when the brake is released, so that the brake release operation is not delayed, and the coil current is temporarily held in the middle of the phenomenon of the coil current when the brake is applied, and then the coil current is gradually reduced. Therefore, the brake collision noise can be reduced without gradually increasing control of the coil current when braking is applied, and the coil current is not increased gradually when braking is applied. An elevator brake control device having a simple circuit can be obtained , and the coil current excitation circuit is excited by the brake release acceleration circuit and the coil current control circuit when the brake is released, so that the coil current for controlling the coil current is controlled. Brake control device for elevator that can reduce the capacity of the switching element of the control circuit Obtained.

Further, in the present invention , when braking is applied, a command for maintaining the coil current that is an intermediate position between the position where the movable piece or the braking piece comes into contact with the brake drum from the position near the start of displacement is installed near the braking piece. A brake-added holding current setting means for detecting and adjusting the coil current before the braking piece collides with the brake drum, and the sensor means is provided near the braking piece so that the braking piece is braked. The present invention is characterized in that a sound pressure sensor for detecting a sound colliding with a drum or a vibration sensor for detecting vibration of a braking piece is provided.

As a result, an elevator brake control device can be obtained in which the holding current can be easily set when braking is applied.

  According to the present invention, it is possible to reduce a brake collision noise without causing an operation delay at the time of braking release and without gradually increasing the coil current at the time of applying a brake, or having a simple coil current control circuit or a switching element. An elevator brake control device capable of reducing the capacity can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 4 show an embodiment of an elevator brake control device according to the present invention.
1 is an overall configuration diagram of an elevator brake control device, FIG. 2 is a coil current excitation circuit of FIG. 1, FIG. 3 is a timing diagram showing the operation of a brake, and FIG. 4 is a relationship between a coil current and an electromagnetic gap. FIG. 6 is a diagram illustrating a position where a coil current is held when braking 3 is applied.

  In FIG. 1, 1 is a sheave of a hoisting machine, a car 3 is suspended on one side of a main rope 2 wound around the sheave 1, and a counterweight 4 is suspended on the other side in a suspending manner. The sheave 1 is driven by the hoist motor 5 so that the car 3 and the counterweight 4 are moved up and down. Reference numeral 6 denotes a brake drum as a braked body, which is installed on a shaft that connects the hoisting machine motor 5 and the sheave 1. A pair of braking pieces 7 abut on the braking surface 6 a of the brake drum 6. Reference numeral 8 denotes a pair of braking arms. The braking piece 7 is provided in the intermediate portion 8c, and the one end portion 8a is rotatably supported. A braking spring 9 is disposed on the other end 8b of the braking arm 8 so that the braking piece 7 applies a pressing force to the braking surface 6a.

  An electromagnet 10 is provided in the vicinity of the other end 8b of the braking arm 8 so as to release the pressing force of the braking spring 9. The electromagnet 10 includes two electromagnetic coils 11a and 11b and a yoke 12 commonly used for the electromagnetic coils 11a and 11b. The yoke 12 has magnetic pole faces 13a and 13b at two locations. The electromagnetic coils 11a and 11b are arranged for the magnetic pole surfaces 13a and 13b, respectively, and have substantially two functions as electromagnets. Further, two movable pieces 14a and 14b are arranged opposite to the magnetic pole surfaces 11a and 11b, and the movable pieces 14a and 14b are connected to the other end portion 8b of the braking arm 8 to be connected to the other end of the braking arm 8. The part 8b is driven, and the brake piece 7 is integrally driven. Reference numeral 15 denotes a coil current excitation circuit for energizing the electromagnetic coils 11a and 11b, and controls the current flowing through the electromagnetic coils 11a and 11b. Reference numeral 16 denotes an AC power supply to be supplied to the coil current excitation circuit 15, and reference numeral 17 denotes a contact of an electromagnetic contactor that connects and disconnects the AC power supply, and is connected to the coil current excitation circuit 15 through this contact. Reference numeral 18 denotes a normally closed contact of an electromagnetic contactor for energizing and interrupting the electromagnetic coils 11a and 11b.

  FIG. 2 shows details of the coil current excitation circuit 15.

  21 is a DC conversion element for converting AC to DC, 22 is a switching element composed of a semiconductor element such as a transistor, and 23 is a discharge resistor connected in parallel with the electromagnetic coils 11a and 11b. The energy stored in the electromagnetic coils 11a and 11b is released and consumed when is opened, and is set to about 10 times the resistance of the electromagnetic coils 11a and 11b itself. The DC output of the DC conversion element 21 is connected to the parallel connection of the electromagnetic coils 11 a and 11 b and the discharge resistor 23 via the normally closed contact 18 and the switching element 22. The normally closed contact 18 is opened when the elevator is quickly stopped, such as in an emergency.

  Reference numeral 24 denotes a coil current command means for instructing a current to flow through the electromagnetic coils 11a and 11b, reference numeral 25 denotes a current detection means for detecting the current of the electromagnetic coil, reference numeral 26 denotes a coil current control means, and the coil current command The command value of the means 24 and the detection value of the current detection means 25 are input, and a drive signal is sent to the switching element 22 so that the command value of the coil current command means 24 and the detection value of the current detection means 25 match. Output and control the current of the electromagnetic coils 11a and 11b. The coil current excitation circuit 15 includes the DC conversion element 21, the switching element 22, the coil current command means 24, the current detection means 25, and a coil current control means 26.

  Next, based on FIG. 3, the operation from the release of braking to the addition of braking according to the first embodiment, that is, the operation from time T1 to time T6 will be described.

  At the time T1, the contact 17 of the electromagnetic contactor supplied with power is connected, and at the time T6, the contact 17 is cut off. The coil current command (a) outputs a pulsed current command during the period from T1 to T3 of the braking release operation. That is, when a braking release command is received at time T1, the contact operation (d) is connected to the contact 17 of the electromagnetic contactor, current starts to flow through the electromagnetic coils 11a and 11b, and the coil current (b) is It increases according to a constant and becomes a constant value. Accordingly, the gap between the electromagnet 10 and the movable pieces 14a and 14b is gradually narrowed from the time T1 as shown in the electromagnet gap (c), but the gap is suddenly narrowed from the middle and completely electromagnetized at the time T2. At the time T3, the suction and suction holding state is obtained. In the initial operation at the time of braking release from the time T1 to the time T3, the brake releasing operation is speeded up by giving a pulse-like command that increases the coil current at the initial energization so as not to delay the start of elevator travel. .

  And, after the movable pieces 14a, 14b are completely attracted, the magnetic resistance of the magnetic circuit is reduced, and even if the exciting current flowing through the electromagnetic coils 11a, 11b is small, an attractive force that overcomes the spring force is generated. At time T3, the current command is lowered, that is, the coil current is lowered, and the holding current is kept constant during the period from T3 to T4. Then, as shown in the coil current (b) by the braking addition command at the time T4, the coil current is temporarily held until the time T5 with the constant current is reduced to the commanded constant value. Thereafter, the coil current is gradually decreased until the brake pieces 14a and 14b come into contact with the brake drum 6 by the coil current command. After the time point T6 after the brake piece 7 contacts the brake drum 6, the coil current command is set to zero and the contact 17 of the electromagnetic contactor is cut off. The coil current decreases to zero according to the circuit time constant. After T6, the braking applied state is maintained.

  Next, the timing position for once holding the coil current when the braking is applied will be described.

  In FIG. 4, the relationship between the coil current and the electromagnet gap until the movable pieces 14a and 14b are completely attracted has hysteresis when braking is released (when current increases) and when braking is applied (when current decreases), and braking is applied. Sometimes the coil current at which the movable pieces 14a and 14b operate is smaller than that when the brake is released. That is, in correspondence with the characteristics of the electromagnet gap (c) in FIG. 3, at the time of brake release, the brake release start point a → the change start point at which the electromagnet gap becomes narrower (attraction displacement start point of the movable pieces 14a, 14b) b → When the complete suction, suction point c → braking release holding point d elapses and braking is applied, the braking release holding point d → electromagnet gap widening start point (movable piece is the return displacement starting point) e → to the brake drum Elapses to a point f where the braking piece 7 contacts. Since the movable pieces 14a and 14b and the braking piece 7 move integrally through the braking arm 8, the movement of the movable pieces 14a and 14b can be the movement of the braking piece 7 in this description.

  Therefore, the timing position at which the coil current is temporarily held is set between the point f immediately before the movable piece comes into contact with the brake drum 6 from the vicinity immediately before the macroscopic return displacement start point e when the brake is applied. At this time, it is preferable that the setting is made immediately before the braking piece 7 contacts the brake drum 6 as much as possible. That is, the smaller the coil current drop from the timing position at which the coil current is temporarily held until it contacts the brake drum 6, that is, the smaller the drop in braking spring force, the smaller the collision noise.

  Next, a method for setting the timing position for holding the coil current when braking is applied will be described.

  In FIG. 4, at the timing position f where the brake piece 7 contacts the brake drum 6, vibration and sound pressure are generated. Therefore, as shown in FIG. 1, the position information of the point f where the braking piece 7 contacts the brake drum 6 is detected by the sensor means 27, and the output of the sensor means 27 is sent to the holding current setting means 28 at the time of braking application. Based on the position information of the point f at which the brake piece 7 comes into contact with the brake drum 6, the coil current value before the point f in contact is set as the holding current. Then, the coil current value set by the holding current setting means 28 when braking is applied is input to the coil current command means 24. This holding current setting is performed manually or automatically. As the sensor means 27, a displacement sensor 29 for obtaining position information, a vibration sensor 30 for obtaining vibration information, a sound pressure sensor 31 for obtaining sound pressure information, and the like are used. That is, the vibration sensor 30 or the sound pressure sensor 31 sets the coil current at which vibration or sound pressure is minimized.

  The description of the embodiment is a case where the elevator stops on the floor during normal travel. That is, when the elevator stops on the floor during normal running, the hoisting motor 5 electrically holds the passenger car 3 and the counterweight 4 stationary so that the braking operation of the brake device can be moderated. This is because it is possible and a braking operation so fast is not required. However, for example, in the event of an emergency where the elevator control device has failed, the elevator needs to be stopped quickly, so a fast braking operation must be performed. For this purpose, a normally closed contact 18 is provided at the DC output of the DC conversion element 21 in the coil current excitation circuit 15 shown in FIG. That is, in an emergency, the command from the coil current command means 24 is set to zero, the normally closed contact 18 is opened, and a closed circuit of the electromagnetic coils 11a and 11b and the discharge resistor 23 is formed, and the electromagnetic coils 11a and 11b are connected. The accumulated energy is consumed by the discharge resistor 23. At this time, the coil current decreases with the time constant of the closed circuit of the electromagnetic coils 11a and 11b and the discharge resistor 23. As described above, the discharge resistor 23 is about 10 times the resistance value of the electromagnetic coils 11a and 11b. The coil current becomes zero almost instantaneously. That is, the braking addition operation is also performed almost instantaneously.

  Next, another embodiment will be described with reference to FIGS.

  FIG. 5 is a diagram corresponding to FIG. 2 of the coil current excitation circuit 15, and FIG. 6 is a timing diagram showing the operation of the brake and corresponding to FIG. The same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals, and description thereof will be omitted as necessary.

  The coil current excitation circuit 15 of this embodiment shown in FIG. 5 includes a brake release promotion circuit 32 and a coil current control circuit 33. The brake release promotion circuit 32 and the coil current control circuit 33 supply current to the electromagnetic coils 11a and 11b. It is supposed to flow. The coil current control circuit 33 has the same configuration as the coil current excitation circuit 15 described in the first embodiment.

  That is, the brake release promoting circuit 32 includes a direct current conversion element 34 that converts alternating current into direct current, and is input from the alternating current power supply 16 through the contact 35 of the electromagnetic contactor, and further through the normally closed contact 18, the electromagnetic coil 11a, 11b and the discharge resistor 23 are output in parallel. The coil current control circuit 33 is input from the AC power source 16 through the contact 36 of the electromagnetic contactor, and the electromagnetic coils 11a and 11b and the discharge resistor 23 are connected in parallel through the normally closed contact 18 as in FIG. Output to the connection.

  Next, the operation of the second embodiment will be described with reference to FIG. In particular, there is a feature in the operation at the time of releasing the brake and the brake release holding, and the operation at the time of applying the brake is the same as that described in FIG. 3 and FIG.

  During the brake release operation period from the time T1 to the time T3, the contact 35 of the electromagnetic contactor (d) is connected, and the output from the brake release acceleration circuit 32 is connected to the electromagnetic coils 11a and 11b as shown in (b). The coil current iA increases according to the time constant of the circuit and becomes a constant value, complete braking is released at time T2, and the contact 35 is cut off at time T3. Simultaneously with the connection of the contact point 35 of the electromagnetic contactor, the contact point 36 of the electromagnetic contactor is connected, and the AC power supply 16 is input to the coil current control circuit 33. In the coil current control circuit 33, the current command of the coil current command (a) of the coil current control circuit 33 is in the form of a wide pulse during the period of the brake release operation and the period from the time T1 to the time T4 of the brake release holding period. The coil current control circuit 33 outputs current to the electromagnetic coils 11a and 11b, and the coil current (b) increases in accordance with the time constant of the circuit. It becomes a constant value.

  Therefore, the total current (iA + iB) of the output current iA of the brake release acceleration circuit 32 and the output current iB of the coil current control circuit 33 flows through the electromagnetic coils 11a and 11b from the time T1 to the time T3 in the operation period at the time of brake release. In this case, the coil current excitation circuit 15 described in the first embodiment outputs a large pulsed current during the initial braking release operation, but in this embodiment, the coil current control circuit 33 does not output a large pulsed current. The capacity of the switching element 22 can be reduced.

  The gap between the electromagnet 10 and the movable pieces 13a and 13b is the same as that of the first embodiment as shown in the electromagnet gap (c). The same applies to the timing position for temporarily holding the coil current during the braking addition operation from time T4, and the same is true for the collision sound with the brake drum 6 being reduced.

  Further, another embodiment will be described with reference to FIGS.

  7 is a coil current excitation circuit corresponding to FIG. 2, and FIG. 8 is a coil current control circuit corresponding to FIG. The same parts as those in FIGS. 2 and 5 are denoted by the same reference numerals and description thereof is omitted.

  In the coil current excitation circuit 15 of FIG. 7 and the coil current control circuit 33 of FIG. 8, 37 is an AC voltage control element made up of a thyristor, a triac, etc., from the AC power supply 16 through the contacts 17, 35, 36 of the electromagnetic contactor. AC power is input. Then, the command value of the coil current command means 24 and the detection value of the current detection means 25 of the coil current are input to the coil current control means 26, and the command value of the coil current command means 24 and the detection value of the current detection means 25 are input. And a drive signal is output to the AC voltage control element 37 so as to coincide with each other, the AC voltage is controlled, and then converted into DC power through the DC conversion element 21, and the electromagnetic coil 11 a through the normally closed contact 18. 11b is energized to control the coil current.

1 is an overall configuration diagram of an elevator brake control device according to an embodiment of the present invention. It is a coil current excitation circuit of FIG. FIG. 2 is a timing chart showing the operation of the brake in FIG. 1. It is a figure which shows the position which hold | maintains the relationship between a coil current and an electromagnet gap, and the coil current at the time of braking addition. It is a coil current excitation circuit of the brake control apparatus for elevators which becomes other embodiment of this invention, and is a figure equivalent to FIG. FIG. 6 is a timing chart showing the operation of the brake of FIG. It is a coil current excitation circuit of the brake control apparatus for elevators which becomes other embodiment of this invention, and is a figure equivalent to FIG. FIG. 6 is a diagram corresponding to FIG. 5 in the coil current control circuit of FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hoisting motor 6 Brake drum 7 Brake piece 9 Brake spring 10 Electromagnet 11a, 11b Electromagnetic coil 14a, 14b Movable piece 15 Coil current excitation circuit 24 Coil current command means 25 Current detection means 26 Coil current control means 27 Sensor means 29 Displacement sensor 30 Vibration sensor 31 Sound pressure sensor 32 Braking release acceleration circuit 33 Coil current control circuit

Claims (2)

A hoisting motor that drives the elevator car up and down, a brake drum provided on the hoisting motor, a braking piece that generates a braking force by pressing against the brake drum, and the braking piece A braking spring for pressing the drum, a movable piece coupled to the braking piece, and an electromagnetic coil constituting an electromagnet for attracting the movable piece against the biasing force of the spring and releasing the braking; In the elevator brake control device configured with a coil current excitation circuit for causing current to flow through the electromagnetic coil,
The coil current excitation circuit includes a brake release acceleration circuit through which a coil current flows at the initial stage of brake release, a current detection unit for detecting a current of the electromagnetic coil, a coil current command unit for commanding a current to flow through the electromagnetic coil, A coil current control circuit comprising coil current control means for controlling the current of the electromagnetic coil by inputting the command value of the coil current command means and the detection value of the current detection means, and at the time of braking release, braking release promotion The circuit and the coil current control circuit are energized in steps, and after a certain time, the brake release acceleration circuit is deactivated and the brake release is maintained by the current of the coil current control circuit. By the circuit, the movable piece or the brake piece is operated at an intermediate position between the position near the start of displacement and the position where it comes into contact with the brake drum. Giving an instruction to hold the Mel coil current, and thereafter, the elevator brake controller being characterized in that so as to gradually decrease the coil current. When the brake is applied, a command for holding the coil current at a midway position between the position where the movable piece or the brake piece comes into contact with the brake drum is detected by sensor means installed near the brake piece. And a holding current setting means at the time of braking addition that adjusts and sets the coil current before the braking piece collides with the brake drum, and the sensor means is installed in the vicinity of the braking piece and the sound that causes the braking piece to collide with the brake drum. The elevator brake control device according to claim 1, wherein the elevator brake control device is a sound pressure sensor for detecting a vibration or a vibration sensor for detecting a vibration of a braking piece .

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