JP2005067763A - Electromagnetic brake device for elevator winch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic brake device for an elevator winch capable of precluding occurrence of failed braking based upon a failure in an electromagnet mechanism and precluding generation of out of order such as inter-floor stopping etc. of an elevator car due to failure. <P>SOLUTION: The electromagnetic brake device for the elevator includes an electromagnetic brake machine 13 to press a brake shoe 4 using a brake spring 6 to the braking surface 5 of a rotor 2 of this elevator winch and attracts the brake shoe 4, when required, by an electromagnet 7 against the action of the brake spring 6. The device is furnished with a plurality of coils forming the electromagnet 7 where n pieces are connected in series, and a power supply device having a current capacity n/(n-1) times as large as the coils is connected with the electromagnetic brake machine 13, and an at-failure control device is installed to connect the other coils to the power supply device when one coil is severed. Thereby the normal brake disengaging motion can be continued by connecting the other coils to the power supply device by the at-failure control device when one coil is severed while the car is operating. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electromagnetic brake device for an elevator hoisting machine in which a braking piece is pressed by a braking spring to perform a braking operation, and the braking piece is attracted and released by an urged electromagnet.

  In a conventional electromagnetic brake device for an elevator hoisting machine, a braking piece is pressed against a braking surface formed on a rotating body of the hoisting machine by a braking spring to perform a braking operation, and the braking electromagnet is biased by an urging electromagnet. The brake is released by being sucked against the pressing force. When the hoisting machine provided with such an electromagnetic braking device is de-energized, that is, when the elevator car is stopped, the electromagnet is de-energized and the hoisting machine is braked by the electromagnetic braking device. When the elevator operation is commanded, the hoisting machine is energized and the electromagnet is energized to release the braking by the electromagnetic braking device. And it is comprised so that a cage | basket | car raises / lowers by operation | movement of a hoisting machine, and it stops at the landing of the hoistway commanded. (For example, refer to Patent Document 1).

JP 2002-348072 (second page, FIG. 1)

  In the conventional electromagnetic brake device for an elevator hoist, when the electromagnet coil is disconnected during operation of the elevator, that is, when the hoist is energized, the brake piece is immediately pressed against the braking surface by the brake spring. As a result, the hoisting machine is abnormally braked, and the elevator car may stop at a position that does not face the landing, such as between the landings provided in the hoistway. At this time, the braking operation of the electromagnetic brake device of the hoisting machine is released by human operation, and the rescue operation is performed in which the car that has been stopped temporarily is moved to the nearest landing and the passengers in the car are rescued to the landing.

  Rescue work that involves releasing the braking operation of the electromagnetic braking device of the hoisting machine by manual operation of the hoisting machine during an emergency stop of the car due to such abnormal braking of the hoisting machine is troublesome. Also, there was a problem that it took a long time to rescue passengers in the car.

  The present invention has been made to solve such a problem, and an object thereof is to obtain an electromagnetic braking device for an elevator hoisting machine that prevents the occurrence of abnormal braking due to abnormality of an electromagnet mechanism.

  In the electromagnetic brake device for an elevator hoisting machine according to the present invention, the braking piece pressed against the braking surface formed on the rotating body of the hoisting machine by the braking spring and, if necessary, the braking piece against the pressing force of the braking spring. An electromagnetic brake composed of an electromagnet that attracts the magnet, a plurality of coils that are connected in series to form an electromagnet, and a current capacity that is n / (n-1) times that of the coil that is connected to the electromagnetic brake. A power supply device and an abnormal time control device for connecting another coil to the power supply device when one of the plurality of coils in the electromagnetic brake is disconnected are provided.

  As described above, the present invention comprises a braking piece pressed against a braking surface formed on a rotating body of a hoisting machine by a braking spring and an electromagnet that attracts the braking piece against the pressing force of the braking spring when necessary. An electromagnetic brake, a plurality of coils in which n pieces are connected in series to form an electromagnet, a power supply device connected to the electromagnetic brake and having a current capacity n / (n-1) times that of the coil, and an electromagnetic control An abnormality control device is provided that connects another coil to a power supply device when one of a plurality of coils in the motive is disconnected.

  As a result, when the elevator car is stopped, the braking piece is pressed against the braking surface of the rotating body of the hoisting machine by the braking spring to perform the braking operation, and the hoisting machine is braked by the electromagnetic braking device constituted by the electromagnetic brake. . In addition, the motor of the hoisting machine is energized during normal operation of the car, and the coil of the electromagnet is energized by the power supply device so that the armature is attracted against the pressing force of the braking spring and rotated by the braking piece. The body brake is released and the hoisting machine operates. This causes the car to move up and down and stop at the designated hoistway landing. And when disconnection generate | occur | produces in one coil at the time of driving | running | working of a cage | basket | car, another coil is connected in series by the function of the control device at the time of abnormality, and is connected to a power supply device. Further, at this time, the setting of the power supply device is switched to the n / (n-1) times mode by the function of the control device at the time of abnormality. Thereby, one coil disconnection in the electromagnetic brake, that is, the occurrence of abnormal braking due to the occurrence of abnormality in the electromagnetic brake is prevented, and the rotating body braking release action is continued. Furthermore, the car moves to the nearest landing by the function of the control device at the time of abnormality and stops. For this reason, when one coil is disconnected, the braking release action of the electromagnetic brake is incomplete and the hoisting machine rotating body rotates in a half-brake state, causing damage to the braking piece and braking surface. This has the effect of preventing the occurrence. Moreover, the car does not stop at any time between the landings when one coil breaks, and the car automatically stops at the nearest landing. For this reason, there is no need to perform a special rescue operation for passengers in the car. Therefore, in a short time after the occurrence of disconnection of one coil, passengers in the car can get off to the landing from the car stopped at the nearest landing. For this reason, there exists an effect which eliminates the anxiety of the passenger confined in a cage | basket | car by abnormality generation of an electromagnetic brake.

Embodiment 1 FIG.
1 to 4 are diagrams showing an example of an embodiment of the present invention. FIG. 1 is a front view of an elevator hoisting machine, and FIG. 2 is an electrical diagram of an electromagnetic braking device provided in the hoisting machine of FIG. FIG. 3 is a diagram showing the arrangement of the devices, FIG. 3 is an electric circuit diagram showing the connection state of the devices in FIG. 2 at normal times, and FIG. 4 is an electric circuit diagram showing the connection state of the devices in FIG. In the figure, a rotating body 2 made of a sheave is provided on a frame 1 of a hoisting machine and is driven by an electric motor (not shown).

  A braking arm 4 having one end pivotally attached to the frame 1 is provided with a braking piece 4 so as to face the braking surface 5 formed on the rotating body 2, and the other end of the braking arm 3 is secured by a braking spring 6. It is biased in the direction of the braking surface 5. An electromagnet 7 is provided on the frame 1, and is disposed so as to face the armature 8 provided in the longitudinal middle of the braking arm 3. The electromagnet 7 includes a magnet core 9 and a plurality of coils 10 provided in the magnet core 9 and connected in series. Note that n is three in the embodiment shown in FIGS.

  The coil 10 is connected to a power supply device 11 having a current capacity n / (n-1) times the number n, and the circuit of the coil 10 is connected to another coil 10 when one of the plurality of coils 10 is disconnected. It is connected to the abnormality control device 12 connected to the power supply device 11. Each coil 10 is manufactured by winding N wires having the same number of wires of the same size, and the coils 10 of R (Ω) having the same resistance value are formed.

  The power supply device 11 is configured to be set to 100% current during normal operation and to be switched to n / (n-1) times current when necessary. The braking arm 3, the braking piece 4, the braking spring 6, the electromagnet 7, the armature 8, the power supply device 11 and the abnormality control device 12 constitute an electromagnetic brake 13. The two sets of electromagnetic brakes 13 are separated from each other and are provided at symmetrical positions with respect to the rotation center of the rotating body 2.

  In the electromagnetic braking device for an elevator hoisting machine configured as described above, the braking piece 4 is pressed against the braking surface 5 of the rotating body 2 of the hoisting machine by the braking spring 6 at a normal time and when the elevator car is stopped. Then, the braking operation is performed, and the hoisting machine is braked by the electromagnetic braking device constituted by the two sets of electromagnetic brakes 13. Further, the motor of the hoisting machine is energized during normal operation of the car, and the coil 10 of the electromagnet 7 is energized by the power supply device 11 to attract the armature 8 against the pressing force of the braking spring 6. The

  As a result, the braking of the rotating body 2 by the braking piece 4 is released, the hoisting machine operates, and the car moves up and down and stops at the designated hoistway landing. In addition, when the coil 10 is energized, a current I flows through each coil 10, and a magnetomotive force (number of turns × current = 3NI) necessary to obtain a predetermined magnetic flux is generated. As a result, the electromagnet 7 attracts and holds the armature 8 so that the rotating body 2 is kept in a non-braking state. Since the voltage drop of the coil 10 at this time is V = 3IR, the power supply device 11 is manufactured to have a voltage capacity of V = 3IR corresponding to this.

  Then, for example, when a break occurs in one coil 10 as shown in FIG. 4 during the operation of the car, the other coil 10 is connected in series and connected to the power supply device 11 by the function of the abnormality control device 12. The At this time, the setting of the power supply device 11 is switched to the n / (n-1) times mode by the function of the control device 12 at the time of abnormality. Thereby, the occurrence of abnormal braking due to the occurrence of abnormality due to disconnection of one coil 10 in the electromagnetic brake 13 in which one coil 10 is disconnected is prevented, and the rotating body 2 braking release action is continued.

  In addition, the brake releasing action of the electromagnetic brake 13 in which one coil 10 is disconnected is continued, and the car is moved to the nearest landing by the function of the abnormality control device 12 and stopped. For this reason, when the disconnection of one coil 10 occurs, the braking release action of the electromagnetic brake 13 is incomplete, and the rotary body 2 of the hoisting machine rotates in a half-brake state, and the braking piece 4 and the braking surface 5 are rotated. Occurrence of damage that damages the device can be prevented.

  Further, the car does not stop at any time between the landings when one coil 10 is disconnected, and the car automatically stops at the nearest landing. For this reason, there is no need to perform a special rescue operation for passengers in the car. As a result, the passengers in the car can get off to the landing from the car that has stopped at the nearest landing in a short time after the disconnection of one coil 10 occurs. Therefore, the anxiety of passengers trapped in the car due to the occurrence of an abnormality in the electromagnetic brake 13 can be eliminated.

The relationship between the voltage and current of the electromagnetic brake 13 in which one coil 10 is disconnected is as follows:
Current capability Ia = 3 / 2I
Voltage capability V = 3IR
Energization current by connecting two coils 10 I ′ = V / 2R = 3 / 2I
Magnetomotive force I '· 2N = 3NI
Thus, a predetermined magnetomotive force is generated within the capacity of the power supply device 11, and the braking of the rotating body 1 can be released against the pressing force of the braking spring 6 by the electromagnetic brake 13.

  When the disconnection of one coil 10 occurs, the car is driven to the nearest landing by the function of the abnormality control device 12, and the passenger in the car can get off to the landing by the automatic abnormality control. In addition, the current of n / (n-1) times of normal time flows through the other coil 10 of the electromagnetic brake 13 in which one coil 10 is disconnected.

  However, although the car is driven to the nearest landing by the function of the controller 12 when an abnormality occurs due to the disconnection of one coil 10, the time required for this operation is short, and the temperature of the other coil 10 does not rise unnecessarily. There is no problem. Also, when one coil 10 other than the coil 10 shown in FIG. 4 is disconnected, the other coil 10 is connected to the power supply device 11 and operates in the same manner as described above. Can be obtained.

Embodiment 2. FIG.
5 and 6 are diagrams showing an example of another embodiment of the present invention. FIG. 5 is a diagram corresponding to FIG. 2, and FIG. 6 is an electric circuit diagram showing a connection state of the device of FIG. It is. In addition to FIG.5 and FIG.6, the electromagnetic brake device of an elevator hoisting machine is comprised similarly to the above-mentioned FIGS.

  In the figure, the same reference numerals as those in FIGS. 1 to 4 denote corresponding parts, and an abnormality control device 15 connected to the electric circuit of the power supply device 14 of the two sets of electromagnetic brakes 13 is provided. Each power supply device 14 is manufactured to have a current capacity twice that of the current capacity in the normal state, and when one power supply device 14 fails, the other power supply device 14 is doubled by the operation of the control device 15 at the time of abnormality. Switch to current capacity mode.

  In the electromagnetic brake device for an elevator hoisting machine configured as described above, the hoisting machine is braked by two sets of electromagnetic brakes 13 at normal times. Further, for example, when the power supply device 14 of one electromagnetic brake 13 breaks down during the operation of the car, the power supply device 14 of the other electromagnetic brake 13 is operated by the operation of the abnormal time control device 15 as shown in FIG. Is switched to the double current capacity mode.

  This prevents the occurrence of abnormal braking of the electromagnetic brake device of the elevator hoist resulting from the failure of one power supply device 14, that is, the occurrence of an abnormality in one electromagnetic brake 13, and the braking release action of the rotating body 2 is continued. The Further, when the abnormality control device 15 operates, the car moves to the nearest landing by the function of the abnormality control device 15 and stops. Therefore, although the detailed description is omitted, the same operation as the embodiment of FIGS. 1 to 4 can be obtained also in the embodiment of FIGS.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is a front view of an elevator hoisting machine. The figure which shows arrangement | positioning of the electric equipment of the electromagnetic braking device provided in the hoisting machine of FIG. The electric circuit diagram which shows the connection state of the apparatus of FIG. 2 in the normal time. The electric circuit diagram which shows the connection state of the apparatus of FIG. 2 at the time of abnormality. FIG. 3 is a diagram showing a second embodiment of the present invention and corresponding to FIG. 2 described above. FIG. 6 is an electric circuit diagram showing a connection state of the device of FIG. 5 at the time of abnormality.

Explanation of symbols

  2 Rotating body of hoist, 4 Braking piece, 5 Braking surface, 6 Braking spring, 7 Electromagnet, 10 Coil, 11 Power supply device, 12 Abnormal control device, 13 Electromagnetic brake, 14 Power supply device, 15 Abnormal control device .

Claims (2)

  An electromagnetic brake composed of a braking piece pressed by a braking spring against a braking surface formed on the rotating body of the hoist and an electromagnet that attracts the braking piece against the pressing force of the braking spring when necessary; and n pieces Are connected in series to form the electromagnet, a power supply device connected to the electromagnetic brake and having a current capacity n / (n-1) times that of the coil, and a plurality of coils in the electromagnetic brake. An electromagnetic brake device for an elevator hoisting machine, comprising: an abnormality control device that connects the other coil to the power supply device when one of the coils is disconnected.   Two sets of electromagnetic brakes comprising a braking piece pressed by a braking spring against a braking surface formed on a rotating body of a hoist and an electromagnet that attracts the braking piece against the pressing force of the braking spring when necessary A power supply device connected to each of the electromagnetic brakes and having a current capacity that is twice the current capacity of the electromagnet in a normal state; and one of the power supply devices connected to the two sets of electromagnetic brakes has failed. An electromagnetic brake device for an elevator hoisting machine comprising an abnormality control device that switches the other power supply device to a double current capacity mode.

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