EP2436635A1 - Elevator device - Google Patents
Elevator device Download PDFInfo
- Publication number
- EP2436635A1 EP2436635A1 EP09845201A EP09845201A EP2436635A1 EP 2436635 A1 EP2436635 A1 EP 2436635A1 EP 09845201 A EP09845201 A EP 09845201A EP 09845201 A EP09845201 A EP 09845201A EP 2436635 A1 EP2436635 A1 EP 2436635A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- brake
- controller
- car
- failure
- command signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
- B66B1/28—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical
- B66B1/32—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on braking devices, e.g. acting on electrically controlled brakes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/027—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions to permit passengers to leave an elevator car in case of failure, e.g. moving the car to a reference floor or unlocking the door
Definitions
- the present invention relates to an elevator apparatus including a brake controller capable of controlling a braking force of a brake device.
- the car is brought to the emergency stop when the failure of the brake controller is detected. Therefore, there is a fear in that a passenger(s) gets(get) stuck in the car. Therefore, there is a problem that a maintenance personnel is required to perform a rescue operation each time the passenger(s) gets (get) stuck.
- the present invention has been made to solve the problem described above, and therefore has an object to provide an elevator apparatus which enables a brake device to perform a braking operation and a brake-release operation even in case of a failure of a brake controller so that a passenger is prevented from getting stuck in a car.
- An elevator apparatus includes: a car; a brake device for braking running of the car; a travel controller for generating an operation command signal for operating the brake device to control a travel of the car; and a brake controller for controlling a braking force of the brake device in response to the operation command signal, in which when a failure of the brake controller is detected, the control performed by the brake controller is invalidated so that the brake device is directly operated in response to the operation command signal.
- the elevator apparatus uses the operation command signal from the travel controller to operate the brake deice when the failure of the brake controller is detected. Therefore, even when the failure occurs in the brake controller, the brake device can perform a braking operation and a brake-release operation so that a passenger is prevented from getting stuck in the car.
- FIG. 1 is a configuration diagram illustrating an elevator apparatus according to Embodiment 1 of the present invention.
- a car and a counterweight 2 are suspended in a hoistway by a main rope 3 corresponding to suspension means, and are raised and lowered in the hoistway by a driving force of a hoisting machine 4.
- the hoisting machine 4 includes a drive sheave 5 around which the main rope 3 is looped, a hoisting-machine motor 6 for rotating the drive sheave 5, and a brake device 7 for braking the rotation of the drive sheave 5.
- the brake device 7 includes a brake drum (brake wheel) 8 connected coaxially to the drive sheave 5, a brake shoe 9 to be brought into contact with and separated away from the brake drum, a brake spring for pressing the brake shoe 9 against the brake drum 8 to apply a braking force thereto, and an electromagnetic magnet for separating the brake shoe 9 away from the brake drum 8 against the brake spring to release the braking force.
- an electromagnetic brake is used as the brake device 7.
- the hoisting-machine motor 6 is provided with a hoisting-machine encoder 10 corresponding to a first speed detection section for generating a signal according to a rotation speed of a rotary shaft thereof, specifically, a rotation speed of the drive sheave 5.
- the hoisting-machine encoder 10 generates two-system detection signals independent of each other.
- an upper hoistway switch 11 is provided in a part of the hoistway in the vicinity of a top terminal landing. In a part of the hoistway in the vicinity of a bottom terminal landing, a lower hoistway switch 12 is provided in a part of the hoistway in the vicinity of a bottom terminal landing.
- the hoistway switches 11 and 12 are used as position correction switches for detecting an absolute position of the car 1 to modify car position information.
- An operating cam 13 for operating the hoistway switches 11 and 12 are mounted to the car 1.
- a car buffer 14 and a counterweight buffer 15 are provided on a bottom (in a pit) of the hoistway.
- the car buffer 14 is placed immediately below the car 1.
- the counterweight buffer 15 is placed immediately below the counterweight 2.
- a governor sheave 16 In an upper part of the hoistway, a governor sheave 16 is provided. In a lower part of the hoistway, a tension sheave 17 is provided. A governor rope (overspeed detection rope) 18 is looped around the governor sheave 16 and the tension sheave 17. Both ends of the governor rope 18 are connected to the car 1. The governor rope 18 is circulated with the raising and lowering of the car 1. As a result, the governor sheave 16 and the tension sheave 17 are rotated at a speed according to a running speed of the car 1.
- a governor encoder 19 corresponding to a second speed detection section for generating a signal according to a rotation speed of the governor sheave 16, specifically, a speed of the car 1 is provided to the governor sheave 16.
- the governor encoder 19 generates two-system detection signals independent of each other.
- the brake device 7 is controlled by a brake controller 20. Signals from the hoisting-machine encoder 10, the hoistway switches 11 and 12, and the governor encoder 19 are input to the brake controller 20. A signal according to a current flowing through the electromagnetic magnet of the brake device 7 is also input to the brake controller 20.
- the brake controller 20 controls the braking force of the brake device 7 in response to the signal from the hoisting-machine encoder 10 and the current signal of the electromagnetic magnet (brake current value).
- the brake controller 20 also controls the braking force of the brake device 7 so as to prevent a deceleration of the car 1 from being excessively large when the car 1 is to be brought to an emergency stop.
- a travel of the car 1 is controlled by a travel controller 21.
- the travel controller 21 controls the hoisting-machine motor 6 and the brake controller 20.
- the travel controller 21 includes a microcomputer for travel control.
- the brake controller 20 includes a microcomputer for brake control.
- the brake controller 20 includes a duplexed computation section, specifically, a first computation section and a second computation section, and is capable of detecting its own failure by comparing the results of computations.
- FIG 2 is a block diagram illustrating a principal part of the elevator apparatus illustrated in Figure 1 .
- a brake coil (electromagnetic coil) 22 is provided to the electromagnetic magnet of the brake device 7. By allowing a current to flow through the brake coil 22, the electromagnetic magnet is excited to generate an electromagnetic force for releasing the braking force of the brake device 7. As a result, the brake shoe 9 is separated away from the brake drum 8. The de-energization of the brake coil 22 de-excites the electromagnetic magnet to press the brake shoe 9 against the brake drum 8 by the spring force of the brake spring. Further, the control of a value of the current flowing through the brake coil 22 enables the control of the braking force of the brake device 7.
- the brake coil 22 is connected to a power-supply device 24 through an intermediation of a brake coil contactor 23.
- the brake coil contactor 23 is connected to the power-supply device 24 through an intermediation of a safety circuit switch group 25.
- the safety circuit switch group 25 includes a plurality of safety switches connected in series. When at least one of the safety switches is opened, the brake coil contactor 23 is de-energized to de-energize the brake coil 22.
- the travel controller 21 includes a brake operation command generating section 21a for generating an operation command signal for operating the brake device 7.
- the operation command signals include a contactor command signal Sc1 for commanding the energization/de-energization of the brake coil contactor 23 and a brake command signal Sb1 for commanding the energization/de-energization of the brake coil 22 (pull-in/release of the brake shoe 9).
- a signal switching section 26 is provided between the travel controller 21 and the brake controller 20, and the brake device 7.
- the signal switching section 26 is connected to the travel controller 21 and the brake controller 20.
- a failure detection signal Sabn is output from the brake controller 20 to the signal switching section 26.
- the brake controller 20 generates a contactor command signal Sc2 for commanding the energization/de-energization of the brake coil contactor 23 based on the contactor command signal Sc1 to output the contactor command signal Sc2 to the signal switching section 26.
- the brake controller 20 also generates a brake control signal Sb2 for controlling the voltage to be applied to the brake coil 22 based on the brake command signal Sb1 to output the brake control signal Sb2 to the signal switching section 26.
- the signal switching section 26 generates a contactor command signal Sc3 for commanding the energization/de-energization of the brake coil contactor 23 and a brake control signal Sb3 for controlling the voltage to be applied to the brake coil 22.
- the contactor command signal Sc3 remains as the contactor command signal Sc2 and the brake control signal Sb3 remains as the brake control signal Sb2.
- the signal switching section 26 invalidates the contactor command signal Sc2 and the brake control signal Sb2 from the brake controller 20 and controls the energization of the brake coil contactor 23 and the voltage of the brake coil 22 based on the contactor command signal Sc1 and the brake command signal Sb1 from the travel controller 21.
- the signal switching section 26 performs switching between the validation and invalidation of the control performed by the brake controller 20. Then, when the failure of the brake controller 20 is detected, the signal switching section 26 invalidates the control performed by the brake controller 20 so as to directly operate the brake device 7 in response to the operation command signal generated by the travel controller 21.
- FIG 3 is a flowchart illustrating a deceleration control operation of the brake controller 20 illustrated in Figure 1 .
- the first computation section and the second computation section of the brake controller 20 simultaneously perform processing illustrated in Figure 3 in parallel.
- the brake controller 20 first performs initial setting of a plurality of parameters required for the processing (Step S1).
- set as the parameters are a car speed (drive-sheave speed) V0 [m/s] used for the determination of car stop, a car speed V1 [m/s] at which the deceleration control is interrupted, a threshold value 10 [A] of the current value of the brake coil 22, and a first threshold value ⁇ 1 [m/s 2 ] and a second threshold value ⁇ 2 [m/s 2 ] of the car deceleration ( ⁇ 1 ⁇ 2).
- the processing after the initial setting is periodically repeated in a preset sampling cycle.
- the brake controller 20 loads the signals from a sensor group including the hoisting-machine encoder 10 in a predetermined cycle (Step S2).
- the car speed V [m/s] and the car deceleration ⁇ [m/s 2 ] are computed based on the signal from the hoisting-machine encoder 10 (Step S3).
- Step S4 it is determined whether or not the car 1 is currently performing an emergency stop operation. More specifically, the brake controller 20 determines that the car 1 is performing the emergency stop operation when the car speed (motor rotation speed) is larger than the speed V0 for the determination of stop and the brake current value is smaller than the current value 10 for the determination of stop.
- the deceleration control is not performed (Step S10).
- Step S5 it is then determined whether or not the car deceleration ⁇ is larger than the first threshold value ⁇ 1 (Step S5).
- Step S10 the deceleration control is not performed (Step S10).
- Step S6 the deceleration control is started (Step S6).
- the hoisting-machine motor 6 When the car 1 is brought to the emergency stop, the hoisting-machine motor 6 is de-energized. Therefore, from the generation of an emergency stop command to the actual exertion of the braking force, the car 1 is accelerated in some cases and decelerated in other cases depending on the imbalance between a load on the car 1 side and a load of the counterweight 2.
- the brake controller 20 determines that the car 1 is accelerated immediately after the generation of the emergency stop command and immediately applies a maximum braking force without performing the deceleration control so that the braking force is exerted as quickly as possible.
- the brake controller 20 determines that the car 1 is decelerated and performs the deceleration control so as to prevent the deceleration from being excessively large.
- the brake controller 20 determines whether or not the car deceleration ⁇ is larger than the second threshold value ⁇ 2 (Step S7).
- a deceleration control switch (not shown) is turned ON/OFF at a preset switching duty (for example, 50%) so as to keep the car deceleration ⁇ down (Step S8).
- a predetermined voltage is applied to the brake coil 22 to control the braking force of the brake device 7.
- Step S9 the deceleration control switch is left in the open state. Thereafter, the brake controller 20 determines whether or not to stop the control (Step S9). For the determination of whether or not to stop the control, whether or not the car speed V is less than the threshold value V1 is determined.
- the processing directly returns to the input processing (Step S2).
- the deceleration control is terminated (Step S10). Then, the processing returns to the input processing (Step S2).
- Figure 4 is a flowchart illustrating an abnormality diagnosis operation of the brake controller 20 illustrated in Figure 1 .
- the first computation section and the second computation section of the brake controller 20 invoke diagnosis processing illustrated in Figure 4 when each processing after the input processing (Step S2) illustrated in Figure 3 is completed.
- the matching between the input values from the sensors or between the computation values obtained by the first computation section and the second computation section is determined (Step S11) More specifically, when a difference between the input values or between the computation values is within a predetermined range, it is determined that no abnormality occurs. Then, the processing returns to the subsequent processing illustrated in Figure 3 . When the difference between the input values or between the computation values exceeds the predetermined range, it is determined that an abnormality occurs. Therefore, the failure detection signal Sabn is output to the signal switching section 26 (Step S12).
- Figure 5 is a graph illustrating the relation between the first threshold value and the second threshold value of the car deceleration, which are set for the brake controller 20 illustrated in Figure 1 , and the car position.
- the first threshold value ⁇ 1 and the second threshold value ⁇ 2 are set for each of the first computation section and the second computation section so as to change according to the car position, as illustrated in Figure 5 . More specifically, each of the first threshold value ⁇ 1 and the second threshold value ⁇ 2 in the vicinity of the terminal landings is set so as to gradually increase toward the terminal landings.
- FIG. 6 is a block diagram illustrating the signal switching section 26 illustrated in Figure 2 .
- a change-over switch section 27 is switched according to the failure detection signal Sabn.
- the change-over switching section 27 illustrated in Figure 6 is in a state in which the failure of the brake controller 20 is not detected. Therefore, the brake control signal Sb2 from the brake controller 20 is directly output as the brake control signal Sb3.
- the change-over switch section 27 When the failure of the brake controller 20 is detected, the change-over switch section 27 performs switching. As a result, a brake current command signal Sb4 generated in an output control logic circuit section 28 is output as the brake control signal Sb3.
- the output control logic circuit section 28 generates the brake current command signal Sb4 based on the brake command signal Sb1. from the travel controller 21, a brake switch signal from a brake switch (not shown) for detecting the position of the brake shoe 9, and a signal from a PWM generation circuit section 29.
- Figure 7 is a graph showing an example of the brake current command signal Sb4 generated in the output control logic circuit section 28 illustrated in Figure 6 .
- the output control logic circuit section 28 When receiving the brake command signal Sb1 for commanding the release of the braking force, the output control logic circuit section 28 outputs a predetermined current command value I1. Thereafter, when the separation of the brake shoe 9 from the brake drum 8 is detected at time t1, the output control logic circuit section 28 reduces the current command value to 12 (I1>I2).
- the current command value is reduced because a pull-in voltage, which is required to maintain the brake shoe 9 in a brake-release position, is smaller than a pull-in voltage, which is required to displace the brake shoe 9 from a braking position (release position) to the brake-release position (pull-in position).
- the PWM generation circuit section 29 generates a signal for changing a duty ratio of PWM control.
- the duty radio of the PWM generation circuit section 29 can be changed by an operation of a rotary switch or the like. Specifically, a control voltage suitable for the brake device 7 corresponding to a target to be controlled is selected by operating the rotary switch or the like to preset the duty ratio. As a result, various types of the brake device 7 can be dealt with by using the common circuit configuration.
- the operation command signal from the travel controller 21 is used to operate the brake device 7 when the failure of the brake controller 20 is detected. Therefore, the brake device 7 can perform the braking operation and the brake-release operation even in case of the failure of the brake controller 20. As a result, a passenger(s) can be prevented from getting stuck in the car 1.
- the preset pull-in voltage is applied to the brake coil 22 according to a state of the brake shoe 9 (by feeding back the state of the brake shoe 9).
- the voltage to be applied to the brake coil 22 can be minimized to prevent the burnout of the brake coil 22.
- power can be saved.
- the deceleration control in case of the emergency stop is performed by the brake controller 20.
- the control on the brake device 7 by the brake controller 20 is not limited thereto.
- control for reducing the operation noise of the brake device 7 may be performed.
- the failure of the brake controller 20 is detected by the brake controller 20 itself in the example described above.
- the failure of the brake controller 20 may be detected by the travel controller 21 or another monitoring device.
- the output control logic circuit section 28 is provided to the signal switching section 26 in the example described above. The position at which the output control logic circuit section 28 is provided is not limited thereto.
- the output control logic circuit section 28 can be provided, for example, in the travel controller 21. Further, the destination of output of the signal may be changed over by the travel controller 21 without using the signal switching section 26 independent of the travel controller 21.
- the travel of the car 1 may be continued in a state in which the brake controller 20 is disconnected until a maintenance center is informed of the failure and a maintenance personnel performs inspection and repair.
- the operation of the elevator apparatus may be stopped until the maintenance personnel performs inspection and repair after the car 1 is moved and stopped at a preset floor or the nearest floor in a state in which the brake controller 20 is disconnected.
- the number of the brake device 7 may be two or more.
- the brake device 7 described in the above-mentioned example brakes the rotation of the drive sheave 5
- the brake device may be a brake (rope brake or the like) which grips the suspension means to brake the car 1 or a brake (car brake) which is mounted to the car 1 to be engaged with a guide rail to brake the car 1.
- the suspension means may also be a belt.
- the 1:1 roping system elevator apparatus is illustrated in Figure 1 , the roping system is not limited thereto. For example, 2:1 roping may be used.
- the car 1 is raised and lowered by the single hoisting machine 4 in the above-mentioned example, the elevator apparatus may use a plurality of hoisting machines.
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Regulating Braking Force (AREA)
- Elevator Control (AREA)
Abstract
Description
- The present invention relates to an elevator apparatus including a brake controller capable of controlling a braking force of a brake device.
- In a conventional elevator apparatus, when a failure is detected by a self-diagnosis of a brake controller, a contactor of a brake coil is immediately de-energized to bring a car to an emergency stop (for example, see Patent Literature 1).
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- Patent Literature 1:
WO 2007/060733 A1 - In the conventional elevator apparatus described above, the car is brought to the emergency stop when the failure of the brake controller is detected. Therefore, there is a fear in that a passenger(s) gets(get) stuck in the car. Therefore, there is a problem that a maintenance personnel is required to perform a rescue operation each time the passenger(s) gets (get) stuck.
- The present invention has been made to solve the problem described above, and therefore has an object to provide an elevator apparatus which enables a brake device to perform a braking operation and a brake-release operation even in case of a failure of a brake controller so that a passenger is prevented from getting stuck in a car.
- An elevator apparatus according to the present invention includes: a car; a brake device for braking running of the car; a travel controller for generating an operation command signal for operating the brake device to control a travel of the car; and a brake controller for controlling a braking force of the brake device in response to the operation command signal, in which when a failure of the brake controller is detected, the control performed by the brake controller is invalidated so that the brake device is directly operated in response to the operation command signal.
- The elevator apparatus according to the present invention uses the operation command signal from the travel controller to operate the brake deice when the failure of the brake controller is detected. Therefore, even when the failure occurs in the brake controller, the brake device can perform a braking operation and a brake-release operation so that a passenger is prevented from getting stuck in the car.
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Figure 1 is a configuration diagram illustrating an elevator apparatus according toEmbodiment 1 of the present invention. -
Figure 2 is a block diagram illustrating a principal part of the elevator apparatus illustrated inFigure 1 . -
Figure 3 is a flowchart illustrating a deceleration control operation of a brake controller illustrated inFigure 1 . -
Figure 4 is a flowchart illustrating an abnormality diagnosis operation of the brake controller illustrated inFigure 1 . -
Figure 5 is a graph showing a relation between a first threshold value and a second threshold value of a car deceleration, which are set for the brake controller illustrated inFigure 1 , and a car position. -
Figure 6 is a block diagram illustrating a signal switching section illustrated inFigure 2 . -
Figure 7 is a graph illustrating an example of a brake current command signal generated by an output control logic circuit section illustrated inFigure 6 . - Hereinafter, an embodiment of the present invention is described referring to the drawings.
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Figure 1 is a configuration diagram illustrating an elevator apparatus according toEmbodiment 1 of the present invention. In the figure, a car and acounterweight 2 are suspended in a hoistway by a main rope 3 corresponding to suspension means, and are raised and lowered in the hoistway by a driving force of a hoistingmachine 4. - The hoisting
machine 4 includes adrive sheave 5 around which the main rope 3 is looped, a hoisting-machine motor 6 for rotating thedrive sheave 5, and a brake device 7 for braking the rotation of thedrive sheave 5. The brake device 7 includes a brake drum (brake wheel) 8 connected coaxially to thedrive sheave 5, abrake shoe 9 to be brought into contact with and separated away from the brake drum, a brake spring for pressing thebrake shoe 9 against thebrake drum 8 to apply a braking force thereto, and an electromagnetic magnet for separating thebrake shoe 9 away from thebrake drum 8 against the brake spring to release the braking force. Specifically, an electromagnetic brake is used as the brake device 7. - The hoisting-
machine motor 6 is provided with a hoisting-machine encoder 10 corresponding to a first speed detection section for generating a signal according to a rotation speed of a rotary shaft thereof, specifically, a rotation speed of thedrive sheave 5. The hoisting-machine encoder 10 generates two-system detection signals independent of each other. - In a part of the hoistway in the vicinity of a top terminal landing, an
upper hoistway switch 11 is provided. In a part of the hoistway in the vicinity of a bottom terminal landing, alower hoistway switch 12 is provided. Thehoistway switches car 1 to modify car position information. Anoperating cam 13 for operating thehoistway switches car 1. - On a bottom (in a pit) of the hoistway, a
car buffer 14 and acounterweight buffer 15 are provided. Thecar buffer 14 is placed immediately below thecar 1. Thecounterweight buffer 15 is placed immediately below thecounterweight 2. - In an upper part of the hoistway, a
governor sheave 16 is provided. In a lower part of the hoistway, atension sheave 17 is provided. A governor rope (overspeed detection rope) 18 is looped around the governor sheave 16 and thetension sheave 17. Both ends of thegovernor rope 18 are connected to thecar 1. Thegovernor rope 18 is circulated with the raising and lowering of thecar 1. As a result, the governor sheave 16 and thetension sheave 17 are rotated at a speed according to a running speed of thecar 1. - A
governor encoder 19 corresponding to a second speed detection section for generating a signal according to a rotation speed of thegovernor sheave 16, specifically, a speed of thecar 1 is provided to thegovernor sheave 16. Thegovernor encoder 19 generates two-system detection signals independent of each other. - The brake device 7 is controlled by a
brake controller 20. Signals from the hoisting-machine encoder 10, the hoistway switches 11 and 12, and thegovernor encoder 19 are input to thebrake controller 20. A signal according to a current flowing through the electromagnetic magnet of the brake device 7 is also input to thebrake controller 20. - The
brake controller 20 controls the braking force of the brake device 7 in response to the signal from the hoisting-machine encoder 10 and the current signal of the electromagnetic magnet (brake current value). Thebrake controller 20 also controls the braking force of the brake device 7 so as to prevent a deceleration of thecar 1 from being excessively large when thecar 1 is to be brought to an emergency stop. - A travel of the
car 1 is controlled by atravel controller 21. Specifically, thetravel controller 21 controls the hoisting-machine motor 6 and thebrake controller 20. Thetravel controller 21 includes a microcomputer for travel control. Thebrake controller 20 includes a microcomputer for brake control. - The
brake controller 20 includes a duplexed computation section, specifically, a first computation section and a second computation section, and is capable of detecting its own failure by comparing the results of computations. -
Figure 2 is a block diagram illustrating a principal part of the elevator apparatus illustrated inFigure 1 . A brake coil (electromagnetic coil) 22 is provided to the electromagnetic magnet of the brake device 7. By allowing a current to flow through thebrake coil 22, the electromagnetic magnet is excited to generate an electromagnetic force for releasing the braking force of the brake device 7. As a result, thebrake shoe 9 is separated away from thebrake drum 8. The de-energization of thebrake coil 22 de-excites the electromagnetic magnet to press thebrake shoe 9 against thebrake drum 8 by the spring force of the brake spring. Further, the control of a value of the current flowing through thebrake coil 22 enables the control of the braking force of the brake device 7. - The
brake coil 22 is connected to a power-supply device 24 through an intermediation of abrake coil contactor 23. Thebrake coil contactor 23 is connected to the power-supply device 24 through an intermediation of a safetycircuit switch group 25. The safetycircuit switch group 25 includes a plurality of safety switches connected in series. When at least one of the safety switches is opened, thebrake coil contactor 23 is de-energized to de-energize thebrake coil 22. - The
travel controller 21 includes a brake operationcommand generating section 21a for generating an operation command signal for operating the brake device 7. The operation command signals include a contactor command signal Sc1 for commanding the energization/de-energization of thebrake coil contactor 23 and a brake command signal Sb1 for commanding the energization/de-energization of the brake coil 22 (pull-in/release of the brake shoe 9). - A
signal switching section 26 is provided between thetravel controller 21 and thebrake controller 20, and the brake device 7. Thesignal switching section 26 is connected to thetravel controller 21 and thebrake controller 20. When a failure of thebrake controller 20 is detected by thebrake controller 20 itself, a failure detection signal Sabn is output from thebrake controller 20 to thesignal switching section 26. - The
brake controller 20 generates a contactor command signal Sc2 for commanding the energization/de-energization of thebrake coil contactor 23 based on the contactor command signal Sc1 to output the contactor command signal Sc2 to thesignal switching section 26. Thebrake controller 20 also generates a brake control signal Sb2 for controlling the voltage to be applied to thebrake coil 22 based on the brake command signal Sb1 to output the brake control signal Sb2 to thesignal switching section 26. - The
signal switching section 26 generates a contactor command signal Sc3 for commanding the energization/de-energization of thebrake coil contactor 23 and a brake control signal Sb3 for controlling the voltage to be applied to thebrake coil 22. - When the
brake controller 20 is normal, specifically, the failure detection signal Sabn is not input, the contactor command signal Sc3 remains as the contactor command signal Sc2 and the brake control signal Sb3 remains as the brake control signal Sb2. - On the other hand, when a failure of the
brake controller 20 is detected, specifically, the failure detection signal Sabn is input, thesignal switching section 26 invalidates the contactor command signal Sc2 and the brake control signal Sb2 from thebrake controller 20 and controls the energization of thebrake coil contactor 23 and the voltage of thebrake coil 22 based on the contactor command signal Sc1 and the brake command signal Sb1 from thetravel controller 21. - As described above, based on whether or not the failure has been detected in the
brake controller 20, thesignal switching section 26 performs switching between the validation and invalidation of the control performed by thebrake controller 20. Then, when the failure of thebrake controller 20 is detected, thesignal switching section 26 invalidates the control performed by thebrake controller 20 so as to directly operate the brake device 7 in response to the operation command signal generated by thetravel controller 21. -
Figure 3 is a flowchart illustrating a deceleration control operation of thebrake controller 20 illustrated inFigure 1 . The first computation section and the second computation section of thebrake controller 20 simultaneously perform processing illustrated inFigure 3 in parallel. InFigure 3 , thebrake controller 20 first performs initial setting of a plurality of parameters required for the processing (Step S1). In this example, set as the parameters are a car speed (drive-sheave speed) V0 [m/s] used for the determination of car stop, a car speed V1 [m/s] at which the deceleration control is interrupted, a threshold value 10 [A] of the current value of thebrake coil 22, and a first threshold value γ1 [m/s2] and a second threshold value γ2 [m/s2] of the car deceleration (γ1<γ2). - The processing after the initial setting is periodically repeated in a preset sampling cycle. Specifically, the
brake controller 20 loads the signals from a sensor group including the hoisting-machine encoder 10 in a predetermined cycle (Step S2). Next, the car speed V [m/s] and the car deceleration γ [m/s2] are computed based on the signal from the hoisting-machine encoder 10 (Step S3). - Thereafter, it is determined whether or not the
car 1 is currently performing an emergency stop operation (Step S4). More specifically, thebrake controller 20 determines that thecar 1 is performing the emergency stop operation when the car speed (motor rotation speed) is larger than the speed V0 for the determination of stop and the brake current value is smaller than thecurrent value 10 for the determination of stop. When the emergency stop operation is not currently being performed, the deceleration control is not performed (Step S10). - When the emergency stop operation is currently being per formed, it is then determined whether or not the car deceleration γ is larger than the first threshold value γ1 (Step S5). When a relation γ≤γ1 is established, the deceleration control is not performed (Step S10). On the other hand, when a relation γ>γ1 is established, the deceleration control is started (Step S6).
- When the
car 1 is brought to the emergency stop, the hoisting-machine motor 6 is de-energized. Therefore, from the generation of an emergency stop command to the actual exertion of the braking force, thecar 1 is accelerated in some cases and decelerated in other cases depending on the imbalance between a load on thecar 1 side and a load of thecounterweight 2. - When the relation γ≤γ1 is established, the
brake controller 20 determines that thecar 1 is accelerated immediately after the generation of the emergency stop command and immediately applies a maximum braking force without performing the deceleration control so that the braking force is exerted as quickly as possible. On the other hand, when the relation γ>γ1 is established, thebrake controller 20 determines that thecar 1 is decelerated and performs the deceleration control so as to prevent the deceleration from being excessively large. - In the deceleration control, the
brake controller 20 determines whether or not the car deceleration γ is larger than the second threshold value γ2 (Step S7). When the relation γ>γ2 is established, a deceleration control switch (not shown) is turned ON/OFF at a preset switching duty (for example, 50%) so as to keep the car deceleration γ down (Step S8). As a result, a predetermined voltage is applied to thebrake coil 22 to control the braking force of the brake device 7. - When the relation γ≤γ2 is established, the deceleration control switch is left in the open state. Thereafter, the
brake controller 20 determines whether or not to stop the control (Step S9). For the determination of whether or not to stop the control, whether or not the car speed V is less than the threshold value V1 is determined. When a relation V≥V1 is established, the processing directly returns to the input processing (Step S2). On the other hand, when a relation V<V1 is established, the deceleration control is terminated (Step S10). Then, the processing returns to the input processing (Step S2). - Next,
Figure 4 is a flowchart illustrating an abnormality diagnosis operation of thebrake controller 20 illustrated inFigure 1 . The first computation section and the second computation section of thebrake controller 20 invoke diagnosis processing illustrated inFigure 4 when each processing after the input processing (Step S2) illustrated inFigure 3 is completed. - In the abnormality diagnosis operation, the matching between the input values from the sensors or between the computation values obtained by the first computation section and the second computation section is determined (Step S11) More specifically, when a difference between the input values or between the computation values is within a predetermined range, it is determined that no abnormality occurs. Then, the processing returns to the subsequent processing illustrated in
Figure 3 . When the difference between the input values or between the computation values exceeds the predetermined range, it is determined that an abnormality occurs. Therefore, the failure detection signal Sabn is output to the signal switching section 26 (Step S12). -
Figure 5 is a graph illustrating the relation between the first threshold value and the second threshold value of the car deceleration, which are set for thebrake controller 20 illustrated inFigure 1 , and the car position. The first threshold value γ1 and the second threshold value γ2 are set for each of the first computation section and the second computation section so as to change according to the car position, as illustrated inFigure 5 . More specifically, each of the first threshold value γ1 and the second threshold value γ2 in the vicinity of the terminal landings is set so as to gradually increase toward the terminal landings. -
Figure 6 is a block diagram illustrating thesignal switching section 26 illustrated inFigure 2 . A change-over switch section 27 is switched according to the failure detection signal Sabn. The change-overswitching section 27 illustrated inFigure 6 is in a state in which the failure of thebrake controller 20 is not detected. Therefore, the brake control signal Sb2 from thebrake controller 20 is directly output as the brake control signal Sb3. - When the failure of the
brake controller 20 is detected, the change-over switch section 27 performs switching. As a result, a brake current command signal Sb4 generated in an output controllogic circuit section 28 is output as the brake control signal Sb3. The output controllogic circuit section 28 generates the brake current command signal Sb4 based on the brake command signal Sb1. from thetravel controller 21, a brake switch signal from a brake switch (not shown) for detecting the position of thebrake shoe 9, and a signal from a PWMgeneration circuit section 29. -
Figure 7 is a graph showing an example of the brake current command signal Sb4 generated in the output controllogic circuit section 28 illustrated inFigure 6 . When receiving the brake command signal Sb1 for commanding the release of the braking force, the output controllogic circuit section 28 outputs a predetermined current command value I1. Thereafter, when the separation of thebrake shoe 9 from thebrake drum 8 is detected at time t1, the output controllogic circuit section 28 reduces the current command value to 12 (I1>I2). The current command value is reduced because a pull-in voltage, which is required to maintain thebrake shoe 9 in a brake-release position, is smaller than a pull-in voltage, which is required to displace thebrake shoe 9 from a braking position (release position) to the brake-release position (pull-in position). - The PWM
generation circuit section 29 generates a signal for changing a duty ratio of PWM control. The duty radio of the PWMgeneration circuit section 29 can be changed by an operation of a rotary switch or the like. Specifically, a control voltage suitable for the brake device 7 corresponding to a target to be controlled is selected by operating the rotary switch or the like to preset the duty ratio. As a result, various types of the brake device 7 can be dealt with by using the common circuit configuration. - In the elevator apparatus described above, the operation command signal from the
travel controller 21 is used to operate the brake device 7 when the failure of thebrake controller 20 is detected. Therefore, the brake device 7 can perform the braking operation and the brake-release operation even in case of the failure of thebrake controller 20. As a result, a passenger(s) can be prevented from getting stuck in thecar 1. - In the case where the braking force of the brake device 7 is to be released when the failure of the
brake controller 20 is detected, the preset pull-in voltage is applied to thebrake coil 22 according to a state of the brake shoe 9 (by feeding back the state of the brake shoe 9). Thus, the voltage to be applied to thebrake coil 22 can be minimized to prevent the burnout of thebrake coil 22. In addition, power can be saved. - In the example described above, the deceleration control in case of the emergency stop is performed by the
brake controller 20. However, the control on the brake device 7 by thebrake controller 20 is not limited thereto. For example, control for reducing the operation noise of the brake device 7 may be performed.
Moreover, the failure of thebrake controller 20 is detected by thebrake controller 20 itself in the example described above. However, the failure of thebrake controller 20 may be detected by thetravel controller 21 or another monitoring device.
Further, the output controllogic circuit section 28 is provided to thesignal switching section 26 in the example described above. The position at which the output controllogic circuit section 28 is provided is not limited thereto. The output controllogic circuit section 28 can be provided, for example, in thetravel controller 21.
Further, the destination of output of the signal may be changed over by thetravel controller 21 without using thesignal switching section 26 independent of thetravel controller 21. - When the failure of the
brake controller 20 is detected, the travel of thecar 1 may be continued in a state in which thebrake controller 20 is disconnected until a maintenance center is informed of the failure and a maintenance personnel performs inspection and repair. Alternatively, when the failure of thebrake controller 20 is detected, the operation of the elevator apparatus may be stopped until the maintenance personnel performs inspection and repair after thecar 1 is moved and stopped at a preset floor or the nearest floor in a state in which thebrake controller 20 is disconnected. - Further, the number of the brake device 7 may be two or more.
Further, although the brake device 7 described in the above-mentioned example brakes the rotation of thedrive sheave 5, the brake device may be a brake (rope brake or the like) which grips the suspension means to brake thecar 1 or a brake (car brake) which is mounted to thecar 1 to be engaged with a guide rail to brake thecar 1.
Moreover, the suspension means may also be a belt.
Although the 1:1 roping system elevator apparatus is illustrated inFigure 1 , the roping system is not limited thereto. For example, 2:1 roping may be used.
Further, although thecar 1 is raised and lowered by thesingle hoisting machine 4 in the above-mentioned example, the elevator apparatus may use a plurality of hoisting machines.
Claims (4)
- An elevator apparatus, comprising:a car;a brake device for braking running of the car;a travel controller for generating an operation command signal for operating the brake device to control a travel of the car; anda brake controller for controlling a braking force of the brake device in response to the operation command signal,wherein when a failure of the brake controller is detected, the control performed by the brake controller is invalidated so that the brake device is directly operated in response to the operation command signal.
- An elevator apparatus according to claim 1, further comprising a signal switching section provided between the travel controller and the brake controller, and the brake device,
wherein the signal switching section performs switching between validation and invalidation of the control performed by the brake controller based on whether or not the failure of the brake controller has been detected. - An elevator apparatus according to claim 1, wherein the brake controller includes a duplexed computation section and is capable of detecting its own failure by comparing results of computations.
- An elevator apparatus according to claim 1, wherein:the brake device includes a brake shoe to be brought into contact with and separated away from a brake drum, a brake spring for pressing the brake shoe against the brake drum to apply a braking force thereto, and an electromagnetic magnet for separating the brake shoe away from the brake drum against the brake spring to release the braking force; anda pull-in voltage preset according to a state of the brake shoe is applied to the electromagnetic magnet for releasing the braking force of the brake device when the failure of the brake controller is detected.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2009/059690 WO2010137134A1 (en) | 2009-05-27 | 2009-05-27 | Elevator device |
Publications (2)
Publication Number | Publication Date |
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EP2436635A1 true EP2436635A1 (en) | 2012-04-04 |
EP2436635A4 EP2436635A4 (en) | 2015-06-10 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP09845201.4A Withdrawn EP2436635A4 (en) | 2009-05-27 | 2009-05-27 | Elevator device |
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EP (1) | EP2436635A4 (en) |
JP (1) | JP5511810B2 (en) |
KR (1) | KR101246994B1 (en) |
CN (1) | CN102378731B (en) |
WO (1) | WO2010137134A1 (en) |
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JP6322563B2 (en) * | 2014-12-22 | 2018-05-09 | 株式会社日立製作所 | Elevator control device and elevator control method |
EP3309104B1 (en) * | 2016-10-14 | 2019-10-09 | KONE Corporation | Method for avoiding unwanted safety gear tripping in an elevator system, controller adapted to perform such a method, governor brake and elevator system each having such a controller |
DE112019007500T5 (en) * | 2019-06-25 | 2022-08-11 | Mitsubishi Electric Corporation | ELEVATOR EQUIPMENT |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6169678A (en) * | 1984-09-07 | 1986-04-10 | 株式会社日立製作所 | Elevator device |
JP2001278559A (en) * | 2000-03-29 | 2001-10-10 | Toshiba Corp | Elevator control device |
JP4275377B2 (en) * | 2002-09-26 | 2009-06-10 | 三菱電機株式会社 | Brake control device for elevator |
JP2005126183A (en) * | 2003-10-23 | 2005-05-19 | Mitsubishi Electric Corp | Brake control device for elevator |
JP4689337B2 (en) * | 2005-04-26 | 2011-05-25 | 三菱電機株式会社 | Elevator equipment |
JP2007084177A (en) * | 2005-09-20 | 2007-04-05 | Toshiba Elevator Co Ltd | Control system of elevator |
KR100995188B1 (en) * | 2005-11-25 | 2010-11-17 | 미쓰비시덴키 가부시키가이샤 | Emergency stop system for elevator |
CN100595122C (en) * | 2006-03-17 | 2010-03-24 | 三菱电机株式会社 | Elevator apparatus |
JP4986541B2 (en) * | 2006-08-31 | 2012-07-25 | 東芝エレベータ株式会社 | Elevator control device |
EP2090540B1 (en) | 2006-12-05 | 2016-05-11 | Mitsubishi Electric Corporation | Elevator system |
-
2009
- 2009-05-27 CN CN200980158454.9A patent/CN102378731B/en not_active Expired - Fee Related
- 2009-05-27 WO PCT/JP2009/059690 patent/WO2010137134A1/en active Application Filing
- 2009-05-27 KR KR1020117019624A patent/KR101246994B1/en not_active IP Right Cessation
- 2009-05-27 EP EP09845201.4A patent/EP2436635A4/en not_active Withdrawn
- 2009-05-27 JP JP2011515792A patent/JP5511810B2/en not_active Expired - Fee Related
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Also Published As
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CN102378731B (en) | 2014-01-01 |
KR20110108410A (en) | 2011-10-05 |
WO2010137134A1 (en) | 2010-12-02 |
JP5511810B2 (en) | 2014-06-04 |
KR101246994B1 (en) | 2013-03-25 |
JPWO2010137134A1 (en) | 2012-11-12 |
CN102378731A (en) | 2012-03-14 |
EP2436635A4 (en) | 2015-06-10 |
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