JP4537043B2 - Elevator brake control device - Google Patents

Description

  The present invention relates to an apparatus for controlling an electromagnetic brake applied to an elevator using a permanent magnet type synchronous motor.

  In the conventional elevator control device, the control means is provided with a slip detection means for detecting the slipping movement of the car based on the travel speed and the travel distance when the power command is cut and the braking command is output. (For example, Patent Document 1).

Japanese Patent No. 2635257 (paragraph 0017, FIGS. 1 and 6)

  In the conventional elevator control apparatus as described above, the abnormality of the braking system is detected by detecting the speed of the car after the power command is cut off and the braking command is output. It is necessary to avoid the influence of speed changes such as car shaking due to the car, and the speed or amount of movement must be checked for a long time. There is a problem of causing a decrease.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator brake control device that can determine whether there is a brake abnormality in a short time.

The brake control device for an elevator according to the present invention cuts off the electric power supplied from the power conversion device to the electric motor when it is determined that the electric motor is braked after outputting a braking command to the electromagnetic brake when the car is stopped. , Count the pulses within a predetermined time generated from the pulse generator coupled to the motor, and if the value is more than the predetermined value of slip detection , detect the slip of the electromagnetic brake and drive the car in the slip direction Stop at the terminal floor, and if this terminal floor is the lowest floor, the door is prevented from opening, and if it is the top floor, the pulses within the predetermined time of the pulse generator are counted again, and the value is below the stationary detection predetermined value If so, the car door is opened .

  In this invention, the braking command is output when the car is stopped, the braking of the motor is detected by the brake switch, the power supply is shut off, and the pulses within the predetermined time of the pulse generator are counted, thereby Since slip is detected, it is possible to judge the electromagnetic brake abnormality in a short time without being affected by the car shaking by the passengers in the car or the car shaking at the time of stopping, and the service deterioration during normal times An abnormality of the electromagnetic brake can be detected without inviting.

Embodiment 1 FIG.
1 to 4 are diagrams showing an embodiment of the first to fifth inventions of the present invention. FIG. 1 is an overall configuration diagram, FIG. 2 is a block diagram, and FIGS. 3 and 4 are operation flowcharts. In the figure, the same reference numerals indicate the same parts.

  In FIG.1 and FIG.2, the cage | basket | car 1 is arrange | positioned at the hoistway of an elevator, and the cage | basket | car 1 stops at each floor 2. FIG. The car 1 is provided with a door control device 3 that controls opening and closing of a car door (not shown). Further, the car 1 is provided with a door opening zone detector 4 for detecting a door opening zone for detecting an openable / closable range of the car door, and a detection plate 5 is provided on the hoistway so as to face the door opening zone detector 4. Has been placed.

  A gearless hoisting machine using a permanent magnet type synchronous motor 6 is installed in the machine room above the hoistway. A main rope 8 is wound around a driving sheave 7 provided on the shaft of the electric motor 6, and a car 1 and a counterweight 9 are coupled to both ends thereof. A pulse generator 10 is attached to the shaft of the electric motor 6. The electric motor 6 is provided with an electromagnetic brake 11, and a brake shoe 11 a that brakes the electric motor 6 with the force of a spring (not shown) and a brake coil that releases the brake by attracting the brake shoe 11 a when energized. 11b. A brake switch 12 is provided for detecting the operation of the brake shoe 11a.

  The brake coil 11b is connected to the DC power supply 14 via normally open contacts 13a and 13b (open when the braking command Bs is output and closed when the braking command Bs is not output) of an electromagnetic contactor (not shown). The control device 20 for controlling the entire electromagnetic brake 11 is composed of a microcomputer and has functions of an operation control means 20A and a slip detection means 20B as shown in FIG. 2, and includes a CPU 21, ROM 22, RAM 23, input port 24 and output port. 25 and connected to each other by a bus 26.

  The input port 24 is connected to the pulse generator 10, the brake switch 12 and the door opening zone detector 4, and the output port 25 is connected to the contacts 13 a and 13 b, the door control device 3 and the power conversion device 27. The power conversion device 27 is connected to the electric motor 6.

Next, the operation of this embodiment will be described. First, the overall operation will be described.
The operation control means 20A of the control device 20 generates a torque command Ts, supplies the three-phase AC power Pm from the power converter 27 to the electric motor 6, and drives it. And although detailed description is abbreviate | omitted, it controls so that the rotational speed of the electric motor 6 corresponds to a speed command signal, and raises / lowers the car 1. At this time, since the operation control means 20A does not output the braking command Bs, the contacts 13a and 13b are closed. Therefore, the brake coils 11b and 11b are energized, and the brake shoes 11a and 11a are opened to release the electric motor 6.

As described above, when the car 1 travels under the control of the operation control means 20A, reaches the floor 2 with a call, and the door opening zone detector 4 faces the detection plate 5, the door opening zone detector 4 is reached. The floor detection signal Zs is generated from the input to the control device 20. Now, the operation control unit 20A determines that the car 1 is stopped, the electric magnetic brake 11 outputs a braking command Bs. As a result, the contacts 13a and 13b are opened, and the brake shoes 11a and 11a brake the electric motor 6.

Next, the slip detection operation of the electromagnetic brake 11 will be described with reference to FIGS.
When the car 1 reaches the floor in step S1, the operation control means 20A interrupts the braking command Bs in step S2. Thus, as described above, the electric motor 6 is in a braking state. In step S3, it is determined whether the brake switches 12, 12 are operated and the brake operation signal Bd is output, that is, whether the electromagnetic brakes 11, 11 are in a braking state.

  When it is determined that the brake switches 11 and 11 are operated, the torque command Ts is turned off in step S4, and the supply of the three-phase AC power Pm from the power converter 27 is shut off. If it is determined in step S3 that the brake switches 12 and 12 are not operating, the process proceeds to step S4 after waiting for a predetermined time (about 0.4 seconds) in step S5. In step S4, since the electric power is cut off in step S4, the motor 6 loses the torque that maintains the unbalanced torque generated by the mass difference between the car 1 and the counterweight 9, and the car 1 slides upward or downward.

  In this state, in step S6, measurement of the output pulse P of the pulse generator 10 generated by the sliding operation is started, and it is determined whether the measured value is equal to or greater than a predetermined value A. If the output pulse P is equal to or greater than the predetermined value A (slip detection predetermined value), it is determined that an abnormality has occurred in the electromagnetic brakes 11 and 11, and the slip detection means 20B outputs a slip detection signal S to the operation control means 20A. If it is less than the predetermined value A, it is determined in step S7 whether the output pulse P is equal to or less than the predetermined value B (first stationary detection predetermined value). If it is less than or equal to the predetermined value B, it is determined that the electromagnetic brakes 11 and 11 are normal, that is, in a stationary holding state. If the door opening zone detector 4 outputs the floor detection signal Zs, the door opening command Dos is output in step S8 to open the door.

  If the output pulse P is not less than or equal to the predetermined value B in step S7, the process proceeds to step S10 after waiting for a predetermined time (about 1 second) in step S9. In step S10, it is determined whether the integrated value of the output pulse P is equal to or less than a specified value C (for example, 1 mm). If the output pulse P is less than or equal to the specified value C, it is determined that the electromagnetic brakes 11 and 11 are in a stationary holding state, and the door is opened in step S8. Conversely, if the integrated value exceeds the specified value C, it is determined that there is an abnormality in the electromagnetic brakes 11, 11, and the process proceeds to step S11.

  In step S11, the sliding direction of the car 1 at this time is determined. In the permanent magnet type synchronous motor, even if the motor 6 is rotating at this time, if the magnetic pole position of the motor 6 can be detected, it is easy to conduct power again and control as usual. At this time, if the sliding direction is the downward direction, the elevator is restarted in step S12 and the vehicle is driven to the lowest floor. When traveling to the lowest floor, the load in the car 1 is heavier than the equilibrium state, and the car 1 moves in the upward direction when the passenger opens at the bottom floor and the load gets lighter. Therefore, the process proceeds to step S22, where the door is not opened until the confirmation by the maintenance negative is completed, and the activation is disabled.

  In addition, when the vehicle is restarted in step S13 and driven to the top floor, the load in the car 1 is lighter than the equilibrium state, and there is no influence even if the passenger is lowered. After landing on the floor, the same processing as steps S2 to S5 is performed in steps S15 to S18. If the output pulse P of the encoder 10 is greater than or equal to the predetermined value A in step S19, the activation is disabled in step S22. If the output pulse P is less than the predetermined value A, it is determined in step S20 whether it is equal to or smaller than the predetermined value D (B <D). If it is equal to or smaller than the predetermined value D, the door is opened in step S21.

  Here, steps S1 and S2 are braking command means, steps S3, S4, S6 and S3 to S6 are slip detection means, and steps S3, S4, S6 to S8, S3, S4 and S6 to S10 are door opening means. Steps S11 to S22 constitute terminal floor operation means.

  In this way, the braking command is output when the car 1 is stopped, the braking of the electric motor 6 is detected by the brake switch 12, the power supply is shut off, and the pulses within the predetermined time of the pulse generator 10 are counted. Thus, the slip of the electromagnetic brake 11 is detected, so that it is possible to determine the abnormality of the electromagnetic brake 11 in a short time without being affected by the car shaking by the passengers in the car 1 or the car 1 at the time of stopping. It is possible to detect an abnormality of the electromagnetic brake 11 without causing a service degradation during normal operation.

  Further, when the slip of the electromagnetic brake 11 is detected, the car 1 is moved to the terminal floor in the sliding direction. When the terminal floor is the lowest floor, the door is prevented from opening, and when the terminal floor is the top floor, the door is opened. Since it did in this way, it becomes possible to eliminate the possibility that the car 1 will move as the load in the car 1 decreases due to the passenger getting off.

1 is an overall configuration diagram showing Embodiment 1 of the present invention. 1 is a block diagram showing a first embodiment of the present invention. The operation | movement flowchart which shows Embodiment 1 of this invention. The operation | movement flowchart which shows Embodiment 1 of this invention.

Explanation of symbols

1 car, 2 floor, 6 permanent magnet synchronous motor, 10 pulse generator, 11 electromagnetic brake, 12 brake switch, 13a, 13b contact, 14 DC power supply, 20 control device, 20A operation control means, 20B slip detection means, 27 Power converter, Dos door open command, Bd brake operation signal, Bs brake command, P pulse signal, Pm three-phase AC power, S slip detection signal, Ts torque command.
S1, S2 braking command means, S3, S4, S6, S3 to S6 slip detection means, S3, S4, S6 to S8, S3, S4, S6 to S10 door opening means, S11 to S22 terminal floor operation means.

Claims (4)

A permanent-magnet synchronous motor that is powered by a power converter to move up and down the car, a pulse generator that is coupled to the motor and generates a pulse corresponding to the rotation angle of the motor, and when a braking command is input, A brake command means for providing an electromagnetic brake for braking the electric motor, a brake switch for detecting an operation state of the electromagnetic brake, and outputting the brake command to the electromagnetic brake when the car is stopped, and an operation of the brake command means Later, a brake determining means for determining whether or not the operating state detected by the brake switch is braking, and when it is determined that the operating state is braking, the power supply from the power converter is cut off. At the same time, the number of pulses within a predetermined time from the pulse generator is counted. A slip detection unit that, when the slip of the electromagnetic brake is detected, driving a car to its sliding direction and is stopped at the terminal landing, if the terminal landings is the lowest floor to prevent door open, the terminal landing The elevator brake is provided with terminal floor operation means for counting the pulses within a predetermined time of the above-mentioned pulse generator at the time of stoppage when the top floor is below the predetermined value for stationary detection and opening the car door Control device. A permanent-magnet synchronous motor that is powered by a power converter to move up and down the car, a pulse generator that is coupled to the motor and generates a pulse corresponding to the rotation angle of the motor, and when a braking command is input, A brake command means for providing an electromagnetic brake for braking the electric motor, a brake switch for detecting an operation state of the electromagnetic brake, and outputting the brake command to the electromagnetic brake when the car is stopped, and an operation of the brake command means Later, a brake determining means for determining whether or not the operating state detected by the brake switch is braking, and when it is determined that the operating state is braking, the power supply from the power converter is cut off. At the same time, the pulses within a predetermined time from the pulse generator are counted, and the value does not become the first stationary detection predetermined value or less and the slip detection predetermined value or more. If the accumulated value of the pulse from the detection start time is less than or equal to the specified value, the door of the car is opened, and if it exceeds the specified value, the door opening means for detecting the slip of the electromagnetic brake, When brake slippage is detected, the car is driven in the sliding direction and stopped at the terminal floor. When this terminal floor is the lowest floor, door opening is prevented, and when the terminal floor is the top floor, An elevator brake control device comprising terminal floor operation means for counting pulses within a predetermined time of the stop-time pulse generator and opening the car door if the value is equal to or less than a second stationary detection predetermined value . A permanent-magnet synchronous motor that is powered by a power converter to move up and down the car, a pulse generator that is coupled to the motor and generates a pulse corresponding to the rotation angle of the motor, and when a braking command is input, A brake command means for providing an electromagnetic brake for braking the electric motor, a brake switch for detecting an operation state of the electromagnetic brake, and outputting the brake command to the electromagnetic brake when the car is stopped, and an operation of the brake command means Later, when it is determined that the operating state detected by the brake switch is braking, and when the operating state is determined not to be braking, the power conversion device is forcibly supplied with power. In addition to shutting off, the number of pulses within a predetermined time from the pulse generator is counted. Elevator brake control device comprising a slip detecting means for detecting. When slippage of the electromagnetic brake is detected, the car is driven in the sliding direction and stopped at the terminal floor. When this terminal floor is the lowest floor, door opening is prevented, and when the terminal floor is the top floor, counting the pulses within a predetermined time of the stop-period pulse generator, according to claim 3, characterized in that a terminal landing operation means for opening the car door when the value is still detection predetermined value or less Elevator brake control device.

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