WO2018016045A1

WO2018016045A1 - Dynamic brake circuit, and elevator device provided with dynamic brake circuit

Info

Publication number: WO2018016045A1
Application number: PCT/JP2016/071377
Authority: WO
Inventors: 潤橋本; 力前田
Original assignee: 三菱電機株式会社
Priority date: 2016-07-21
Filing date: 2016-07-21
Publication date: 2018-01-25

Abstract

This invention includes: a first processing circuit for determining the input state of a mode switching switch for switching between automatic mode and manual mode; a second processing circuit for determining the input state of a manual operation button during manual mode; a third processing circuit for producing a short-circuit between wires of a motor to generate dynamic braking when it is determined that manual mode is in effect and it is also determined that an operation input using the manual operation button is absent; and a fourth processing circuit for determining a state in which dynamic braking is being generated or a state in which an operation input using the manual operation button is being maintained to be an operation-input-enabled state. When it is determined that an operation-input-enabled state is present, the second processing circuit accepts the input state of the manual operation button, generates a manual operation command corresponding to the input state, and outputs the manual operation command to a controller for performing overall control of an elevator.

Description

DYNAMIC BRAKE CIRCUIT AND ELEVATOR DEVICE PROVIDED WITH DYNAMIC BRAKE CIRCUIT

The present invention relates to a dynamic brake circuit that generates a braking torque by short-circuiting a main circuit of a hoisting machine motor, and an elevator apparatus including the dynamic brake circuit.

There is a conventional elevator apparatus that employs, as a hoist motor, an electric motor that generates a braking torque by short-circuiting a main circuit (see, for example, Patent Document 1). The elevator apparatus according to Patent Document 1 includes a maintenance device that short-circuits the main circuit. Even when the brake torque decreases and the car starts to move, the speed of the car can be prevented from increasing by short-circuiting the main circuit and generating braking torque by dynamic braking.

JP 2000-233877 A

However, the prior art has the following problems.
Patent Document 1 does not have a function of detecting a failure of the maintenance device itself that short-circuits the main circuit. Therefore, when the maintenance device is out of order, when the brake torque is reduced, it is impossible to reliably perform the operation of generating the braking torque by the dynamic brake. Further, Patent Document 1 has a problem that the main circuit is not short-circuited even when the power supply is lost.

The present invention has been made to solve the above-described problems. A dynamic brake circuit and a dynamic brake circuit capable of reliably generating a braking torque by a dynamic brake when the brake torque is reduced. It aims at obtaining the equipped elevator apparatus.

A dynamic brake circuit according to the present invention is a dynamic brake circuit used in an elevator apparatus that drives a car by a motor, and switches between an automatic mode for normal operation of the elevator and a manual mode for maintenance work. A first processing circuit for determining an input state of the switch, a second processing circuit for determining an input state of a manual operation button for moving the car in the manual mode, a manual mode determined by the first processing circuit; and A third processing circuit that generates a dynamic brake by short-circuiting between motor lines and a third brake that generates a dynamic brake when it is determined by the second processing circuit that there is no operation input from the manual operation button. Or when there is an operation input by a manual operation button by the second processing circuit A state in which the determination is continued includes a processing circuit group including a fourth processing circuit that determines that an operation input is possible, and the second processing circuit is determined to be an operation input enabled state in the fourth processing circuit In this method, an input state of a manual operation button is received, a manual operation command corresponding to the input state is generated, and a manual operation command is output to a controller that performs overall control of the elevator.

Moreover, the elevator apparatus provided with the dynamic brake circuit according to the present invention converts power supplied from an externally supplied AC power source, and supplies power to a motor that drives the elevator, and controls switching of the power converter. Thus, the target power is supplied to the motor, and the controller that performs overall control of the elevator is provided on the power supply path between the AC power source and the power converter, and opens and closes the AC power source supplied to the power converter. A main circuit contactor and the dynamic brake circuit according to claim 2, wherein the controller controls the raising / lowering operation of the car in the manual mode based on the manual operation command received from the dynamic brake circuit, and the main circuit contactor When the power supply permission command is received from the dynamic brake circuit, the power supply path is closed. Supplying AC power to the power converter Te, if it does not receive power supply permission instruction from the dynamic braking circuit is to cut off the AC power supplied to the power converter power supply path is opened condition.

According to the present invention, by combining a simple processing circuit, a dynamic brake circuit having a self-diagnosis function that can be easily added to an existing elevator is realized. As a result, it is possible to obtain a dynamic brake circuit that can reliably generate a braking torque by a dynamic brake when the brake torque is reduced, and an elevator apparatus including the dynamic brake circuit.

It is the figure which showed the whole elevator apparatus structure in Embodiment 1 of this invention.

Hereinafter, preferred embodiments of a dynamic brake circuit and an elevator apparatus including the dynamic brake circuit according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an overall configuration of an elevator apparatus according to Embodiment 1 of the present invention. In the elevator apparatus according to the first embodiment, the main rope 3 that connects the car 1 and the counterweight 2 is suspended from the hoisting machine sheave 4 and driven by the driving force generated by the hoisting machine motor 5. 1 is moved up and down.

In order to control the hoisting machine motor 5, a power converter 11, a main circuit contactor 12, a breaker 13, and a controller 14 that comprehensively controls the elevator are housed in the control panel 10. The power converter 11 converts the electric power supplied from the building-side power supply 30 into a desired value, and controls the hoisting machine motor 5.

Between the building-side power supply 30 and the power converter 11, the contacts of the breaker 13 and the main circuit contactor 12 are inserted in series. Accordingly, the power supply path from the building-side power source 30 that is an external AC power source to the power converter 11 can be shut off by shutting off the breaker 13 or the main circuit contactor 12. .

Further, the car 1 is provided with a mode switch 6 for switching the elevator operation mode to the automatic mode or the manual mode, and

manual operation buttons

7a and 7b for moving the car 1 in the manual mode. The manual operation button 7a is a button for manually raising the car 1 during maintenance inspection, and the manual operation button 7b is a button for manually lowering the car 1 during maintenance inspection.

When performing maintenance and inspection of the elevator, the maintenance staff can generate a manual operation command by operating the mode changeover switch 6 to switch to the manual mode and operating the manual operation button 7a or the manual operation button 7b. On the other hand, the controller 14 can move the car 1 to a desired position based on the generated manual operation command.

The elevator apparatus shown in FIG. 1 in the first embodiment has a technical feature in that it has a dynamic brake circuit 20 composed of a relay and a contactor in order to realize the following three functions. .

(Manual operation command generation function) An appropriate manual operation command is transmitted to a controller (not shown) in the control panel 10 based on the operation of the maintenance staff. However, the manual operation command is output to the controller 14 only when the dynamic brake circuit 20 can be normally operated by a second self-diagnosis function described later.

(Self-diagnosis function) A relay or contactor constituting the dynamic brake circuit 20 has a configuration capable of self-diagnosis that an off failure or an on failure has occurred. In an off-failure state or an on-failure state, a manual operation command is not output even when there is an operation input by a maintenance staff.

Here, “off failure” means a failure that remains in the off state when the relay or contactor contact should be switched on for some reason. Similarly, “on failure” means a failure that remains on when a relay or contactor contact should be switched off for some reason.

(Dynamic brake function)
When the conditions for holding the elevator are satisfied, a dynamic brake is generated by short-circuiting the lines of the hoist motor 5. This condition corresponds to a condition in which the motor line short-circuit contactor 23 described later is not driven.

The dynamic brake circuit 20 according to the first embodiment includes an automatic mode detection relay 21, a manual operation command detection relay 22, a motor line short-circuit contactor 23, and a failure detection relay 24 in order to realize the above-described three functions. It is prepared for.

The automatic mode detection relay 21 is a relay that is driven in an excited state when the mode switch 6 is in the automatic mode. In FIG. 1, the relay body and contacts of the automatic mode detection relay 21 are described as “AT”. Further, the circuit constituted by the relay main body of the automatic mode detection relay 21 and its contacts corresponds to the first processing circuit.

The manual operation command detection relay 22 has a failure detection relay 24, which will be described later, in an ON state (that is, corresponds to a state in which the self-diagnosis result is normal and no failure is detected), and the manual operation button 7a or manual The relay is driven to be excited when the operation button 7b is pressed. In FIG. 1, the relay body and contacts of the manual operation command detection relay 22 are described as “HR”. Moreover, the circuit comprised by the relay main body of the manual operation command detection relay 22 and its contact corresponds to a 2nd processing circuit.

The motor line short-circuit contactor 23 is a contactor that is driven in an excited state when either the automatic mode detection relay 21 or the manual operation command detection relay 22 is driven. In FIG. 1, the contactor main body and the contacts of the motor-wire short-circuit contactor 23 are described as “MS”. Moreover, the circuit comprised by the contactor main body of the short circuit contactor 23 between motor wires, and its contact corresponds to a 3rd processing circuit.

In addition, the dynamic brake circuit 20 shown in FIG. 1 has a configuration in which the dynamic brake works by short-circuiting the lines of the hoist motor 5 in a state where the motor-line short-circuit contactor 23 is not driven.

The failure detection relay 24 is driven when the motor-line short-circuit contactor 23 is not driven, and maintains the drive state while the manual operation command detection relay 22 is driven in a state where it is driven. Relay. In FIG. 1, the relay body and contacts of the failure detection relay 24 are described as “FD”. Further, the circuit constituted by the relay main body of the failure detection relay 24 and its contacts corresponds to a fourth processing circuit.

The main circuit contactor 12 in the control panel 10 can be driven when the motor line short circuit contactor 23 is driven and at least one of the automatic mode detection relay 21 and the failure detection relay 24 is not driven. It becomes.

In other words, a power supply permission command is output from the dynamic brake circuit 20 to the main circuit contactor 12 when the motor line is not in a short circuit state but in an automatic operation state and the failure detection relay 24 is in an on state. It means that. On the other hand, when it is a short circuit state between motor lines, a power supply permission command is not output. Even when the motor line is not short-circuited, the power supply permission command is not output even in the automatic mode or when the failure detection relay 24 is off and the operation input is not possible.

The dynamic brake circuit 20 having such a circuit configuration is connected to each circuit in the control panel 10 as shown in FIG. As a result, when the contact of the motor line short-circuit contactor 23 is in the OFF state, the main circuit contactor 12 can be de-energized, the power feeding circuit to the hoisting motor 5 can be short-circuited, and the hoisting motor 5 A dynamic brake can be generated by short-circuiting the wires.

Further, even when the contact of the motor line short-circuit contactor 23 is in the ON state, when the automatic mode detection relay 21 is in the automatic mode and the failure detection relay 24 is driven, The main circuit contactor 12 can be brought into a non-excited state, and the power supply circuit to the hoisting machine motor 5 can be short-circuited.

By adopting the dynamic brake circuit 20 having such a circuit configuration, the following effects can be obtained.
(Effect 1) The elevator apparatus provided with the dynamic brake function with respect to the external force from the system of the passenger car 1 and the counterweight 2 can be realized. The dynamic brake circuit 20 according to the first embodiment can be easily added to an existing elevator.

(Effect 2) The self-diagnosis of the dynamic brake is enabled by the combination circuit composed of three relays and one contactor. As a result, when a state in which the dynamic brake functions normally cannot be secured, a configuration that does not output a manual operation command can be realized by a simple circuit.

Regarding the dynamic brake circuit 20 according to the first embodiment, the functions during normal operation and failure detection are summarized as follows.

<During normal operation>
In the automatic mode, the automatic mode detection relay 21 is driven, and the motor line short-circuit contactor 23 is driven. As a result, the line of the hoisting motor 5 is not short-circuited, so that the dynamic brake is disabled.

On the other hand, when switching from the automatic mode to the manual mode by the mode change switch 6 during maintenance work or the like, the automatic mode detection relay 21 is cut off, and the motor line short-circuit contactor 23 is also cut off. As a result, the lines of the hoisting machine motor 5 are short-circuited, and the dynamic brake becomes effective.

Furthermore, when the manual operation command detection relay 22 is driven in response to the manual operation in the manual mode during maintenance work, the motor line short-circuit contactor 23 is driven again. As a result, the dynamic brake is disabled and the car 1 can travel by manual operation.

Also, the input state by the manual operation buttons 7a and 7n can be received only when the operation input enabled state corresponding to the case where the failure detection relay 24 is in the ON state. As a result, the dynamic brake circuit 20 can accept an input operation using the manual operation buttons 7a and 7n and transmit a manual operation command to the controller 14 only when the self-diagnosis result is normal.

<When a failure is detected>
(1) At the time of failure of the automatic mode detection relay 21 When the automatic mode detection relay 21 is turned on, the failure detection relay 24 is not driven, so that the manual operation command is not transmitted to the control panel 10. As a result, the operator can determine that some failure has occurred in the dynamic brake circuit 20 because manual operation is disabled.

On the other hand, when the automatic mode detection relay 21 is in an off failure, the dynamic brake is effective, but the main circuit contactor 12 cannot be driven. As a result, the elevator becomes inoperable, and the operator can determine that some failure has occurred in the dynamic brake circuit 20.

(2) When the manual operation command detection relay 22 fails When the manual operation command detection relay 22 is turned on, the failure detection relay 24 is not driven, so that the manual operation command is not transmitted to the control panel 10. As a result, the operator can determine that some failure has occurred in the dynamic brake circuit 20 because manual operation is disabled.

On the other hand, when the manual operation command detection relay 22 has an off failure, the main circuit contactor 12 cannot be driven during manual operation. As a result, the elevator becomes inoperable, and the operator can determine that some failure has occurred in the dynamic brake circuit 20.

(3) When the motor-line short-circuit contactor 23 fails When the motor-line short-circuit contactor 23 is on-failed, the failure detection relay 24 is not driven, so that a manual operation command is not transmitted to the control panel 10. As a result, the operator can determine that some failure has occurred in the dynamic brake circuit 20 because manual operation is disabled.

On the other hand, when the motor-wire short-circuit contactor 23 is turned off, the dynamic brake is effective in the automatic mode, but the main circuit contactor 12 cannot be driven. As a result, the elevator becomes inoperable, and the operator can determine that some failure has occurred in the dynamic brake circuit 20.

(4) At the time of failure of the failure detection relay 24 When the failure detection relay 24 is turned on, the main circuit contactor 12 cannot be driven in the automatic mode. As a result, the elevator becomes inoperable, and the operator can determine that some failure has occurred in the dynamic brake circuit 20.

On the other hand, when the failure detection relay 24 is turned off, the manual operation command is not transmitted to the control panel 10. As a result, the operator can determine that some failure has occurred in the dynamic brake circuit 20 because manual operation is disabled.

As described above, according to the first embodiment, a dynamic brake circuit having a self-diagnosis function is realized by a circuit constituted by three relays and one contactor. Therefore, when the elevator maintenance worker gets on the car and performs the maintenance work, the work can be reliably performed by operating the dynamic brake.

Furthermore, it is possible to confirm in advance that the dynamic brake circuit is normal by the self-diagnosis function. As a result, it is possible to prevent the elevator car from being lifted due to loss of brake torque or the like during maintenance work, and the elevator maintenance staff being caught between the ceiling and the car.

Furthermore, the dynamic brake circuit according to the first embodiment can be easily added to an existing elevator.

Note that the rectifying element in the power converter 11 that is linked to the dynamic brake function described above can be formed of a wide band gap semiconductor. Wide bandgap semiconductors have high voltage resistance and high allowable current density, so that switching elements and diode elements can be miniaturized.

Note that examples of wide band gap semiconductors having a large band gap include SiC, gallium nitride materials, and diamond.

The power converter 11 composed of a self-extinguishing type switching element and a diode formed of such a wide band gap semiconductor has high withstand voltage and high allowable current density. For this reason, size reduction of the power converter 11 is possible.

Also, since the heat resistance is high, the heat sink fins can be miniaturized and the water cooling part can be air cooled. Therefore, the power converter 11 can be further miniaturized.

Also, since the power loss is low, the self-extinguishing type switching element and the diode can be made highly efficient, and thus the power converter 11 can be made highly efficient.

It is desirable that both the self-extinguishing type switching element and the diode are formed of a wide bandgap semiconductor, but either the self-extinguishing type switching element or the diode is formed of a wide bandgap semiconductor. May be. Even in this case, the above-described effects can be obtained.

As a result, it is possible to reduce the size of the power converter 11 and the control panel 10 incorporating the power converter in an elevator apparatus equipped with a dynamic brake circuit by using a miniaturized switching element or diode element. It becomes possible.

Claims

A dynamic brake circuit used in an elevator apparatus that drives a car by a motor,
A first processing circuit for determining an input state of a mode changeover switch for switching between an automatic mode for performing normal operation of the elevator and a manual mode for performing maintenance work;
A second processing circuit for determining an input state of a manual operation button for moving the car in the manual mode;
A dynamic brake is generated by short-circuiting the motor lines in a state in which the first processing circuit determines that the manual mode is selected and the second processing circuit determines that there is no operation input from the manual operation button. A third processing circuit,
A state in which the dynamic brake is generated by the third processing circuit or a state in which it is determined that there is an operation input by the manual operation button by the second processing circuit is determined as an operation input enabled state. And a fourth processing circuit including a processing circuit group including:
The second processing circuit receives an input state of the manual operation button when it is determined that the operation input is possible in the fourth processing circuit, generates a manual operation command corresponding to the input state, A dynamic brake circuit that outputs the manual operation command to a controller that performs overall control of the elevator.
The processing circuit group is at least one of a state determined by the first processing circuit as not being in the automatic mode or a state determined by the fourth processing circuit as not being in the operation input enabled state. And a power supply permission command for energizing the main circuit contactor that supplies power to the motor when the third processing circuit does not generate the dynamic brake. The dynamic brake circuit according to claim 1, which outputs the dynamic brake circuit.
The dynamic brake circuit according to claim 1, wherein the processing circuit group includes a combination circuit of a relay and a contactor.
A power converter that converts AC power supplied from the outside into power and supplies it to a motor that drives the elevator;
By controlling the switching of the power converter, a target power is supplied to the motor, and a controller that performs overall control of the elevator;
A main circuit contactor that is provided on a power supply path between the AC power source and the power converter, and that opens and closes the AC power source supplied to the power converter;
A dynamic brake circuit according to claim 2,
The controller controls the raising / lowering operation of the car in the manual mode based on the manual operation command received from the dynamic brake circuit,
When the main circuit contactor receives the power supply permission command from the dynamic brake circuit, the main circuit contactor closes the power supply path to supply the AC power to the power converter, and from the dynamic brake circuit to the power An elevator apparatus comprising a dynamic brake circuit that shuts off the AC power supplied to the power converter by opening the power supply path when the supply permission command is not received.
The elevator apparatus provided with the dynamic brake circuit of Claim 4. The switching element in the said power converter is formed with the wide band gap semiconductor.
The elevator apparatus provided with the dynamic brake circuit according to claim 5, wherein the wide band gap semiconductor is silicon carbide, a gallium nitride-based material, or diamond.