JP4974745B2 - Magnet brake diagnostic device for passenger conveyor - Google Patents

Description

  The present invention relates to a diagnostic apparatus for a passenger conveyor magnet brake used for maintenance work such as an escalator.

Conventionally, as a diagnostic device for magnet brakes for passenger conveyors, the brake operation current of the magnet brake is detected during normal operation of the passenger conveyor, and the current state information of the magnet brake is extracted, and this is used when the passenger conveyor is newly installed. There is known one that diagnoses the degree of abnormality of a magnet brake by comparing with initial state information (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-5675

  However, in the diagnostic device for a magnet brake for passenger conveyors described in the above-mentioned Japanese Patent Application Laid-Open No. 11-5675, in order to detect a brake operation current, it is necessary to specially provide a current detector dedicated for diagnosis. In addition to incurring costs, the current detector has a problem in that the diagnostic accuracy cannot be improved due to the influence of voltage fluctuation or installation environment temperature fluctuation.

  The present invention has been made from the actual situation in the above-described prior art, and an object of the present invention is to provide a diagnostic device for a passenger conveyor magnet brake that can be reduced in cost and accuracy.

  In order to achieve the above object, the present invention provides a movable piece that brakes the rotating body by pressing the rotating body that is rotated by transmitting the driving force of the electric motor via the speed reducer, and an electric current is supplied. In the diagnostic device for diagnosing the operating state of the magnet brake for passenger conveyor, which is provided with at least an electromagnetic coil for attracting the movable piece by magnetic force to release the braking of the rotating body, a drive torque command is given to the electric motor. Torque command means for controlling the drive, monitor means for monitoring torque output information output by the drive torque command, rotation detection means for detecting the rotation of the input side shaft of the speed reducer, and the electromagnetic coil Coil operation detecting means for detecting the start of current supply of the current, and the rotation detecting means detects the rotation from the detection of the start of current supply by the coil operation detecting means. Drive shaft rotation start detection means for detecting a first time until the start, and second until the torque command output value detected by the monitor means starts to rise from the detection of current supply start by the coil operation detection means The torque command output rise start detecting means for detecting the time, and at least one of the first time or the second time and a normal value are compared, and either the first time or the second time It is characterized by comprising at least first diagnosis means for diagnosing a stroke abnormality of the magnet brake when the value is equal to or greater than the normal value.

  Further, according to the present invention, the normal value is obtained in a state (initial state) in which the magnet brake is not deteriorated or worn when a passenger conveyor is newly installed. Torque command output value detected by the monitoring means from the time corresponding to about 130% of the time from the start detection until the rotation detecting means detects the rotation or the start detection of the current supply detected by the coil operation detecting means Is characterized by a time corresponding to about 130% of the time until the start of rising.

  Furthermore, in the present invention, a time difference rate calculating means and a second diagnosis means are provided instead of the first diagnosis means, and the time difference rate calculating means calculates a ratio between the first time T1 and the second time T2. A configuration in which the second diagnosis unit compares the ratio calculated by the time difference rate calculation unit with a set value, and diagnoses a magnet brake stroke abnormality when the ratio is equal to or greater than the set value. It is characterized by that.

  Furthermore, the present invention provides the set value obtained from the start of current supply detected by the coil operation detecting means when the magnet brake is not deteriorated or worn when a passenger conveyor is newly installed. About the ratio of the time until the rotation detecting means detects rotation and the time until the torque command output value detected by the monitoring means starts increasing from the start of current supply detected by the coil operation detecting means It is characterized by 150%.

  According to the present invention, since the operation state of the magnet brake is diagnosed by the change in the drive shaft rotation start time and the torque output increase start time, it is already installed in the passenger conveyor without providing a dedicated current detector. It is possible to divert the passenger conveyor control device and the inverter device, and to reduce the cost and accuracy, and without depending on the skill and experience of the maintenance worker, the diagnosis work of the maintenance worker can be performed. A diagnostic device for a magnet brake for a passenger conveyor that makes it possible to reduce labor is obtained.

  Hereinafter, an embodiment of a diagnostic device for a magnet brake for a passenger conveyor according to the present invention will be described with reference to FIGS. FIG. 1 is a front view of an essential part of an electric motor drive unit of a passenger conveyor according to an embodiment of the present invention. FIG. 2 is a side view of an essential part of a magnet brake part of a passenger conveyor according to an embodiment of the present invention. FIG. 3 is a functional block diagram showing a configuration of a diagnostic device for a passenger conveyor magnet brake according to an embodiment of the present invention. FIG. 4 is a characteristic diagram showing the relationship between each output and time obtained by the diagnostic device for a passenger conveyor magnet brake according to an embodiment of the present invention. FIG. 5 is a flowchart for explaining a flow of a diagnostic operation by a diagnostic apparatus for a passenger conveyor magnet brake according to an embodiment of the present invention. FIG. 6 is a functional block diagram showing the configuration of a diagnostic device for a passenger conveyor magnet brake according to another embodiment of the present invention. FIG. 7 is a flowchart for explaining a flow of a diagnostic operation by a diagnostic device for a passenger conveyor magnet brake according to another embodiment of the present invention.

  A motor drive unit 1 of a passenger conveyor that employs an inverter control system such as an escalator according to an embodiment of the present invention shown in FIG. 1 has a driving force generated by an electric motor (motor) 2 input to a speed reducer 4 by a belt 3. The driving sprocket 6 is configured to transmit the driving force of the output side shaft 4B of the speed reducer 4 to the driving sprocket 6 through the power chain 5 by the driving sprocket 6. A plurality of steps are caused to travel by driving a step chain (not shown) that connects the steps in an endless manner.

  In order to stop the travel of the step, a disk-type passenger conveyor magnet brake 7 (hereinafter referred to as magnet brake 7) pivotally supported on the input side shaft 4A of the speed reducer 4 is used to input the speed reducer 4 to the input side. This is done by stopping the rotation of the shaft 4A. As shown in FIG. 2, the magnet brake 7 has a core 7A provided on the side surface of the speed reducer 4 and a movable part slidably provided on the input side shaft 4A of the speed reducer 4 located outside the core 7A. A piece 7B, a rotating body 7C positioned outside the movable piece 7B and connected to the input side shaft 4A of the speed reducer 4 by a gear or the like, and a position outside the rotating body 7C and the speed reducer 4 A side plate 7E fixed to a core 7A provided on a side surface by a fastener 7D, an electromagnetic coil 7F provided on the core 7A, and a plurality of spring forces provided on the core 7A and pressing the movable piece 7B against the rotating body 7C. And a braking spring 7G made of a coil spring or the like.

  The magnet brake 7 releases the brake by freeing (releasing) the rotating body 7C rotating together with the input side shaft 4A by attracting the movable piece 7B by the magnetic force generated by energizing the electromagnetic coil 7F. In addition, the energization of the electromagnetic coil 7F is interrupted, the magnetic force is lost, and the movable piece 7B is pressed against the rotating body 7C by the spring force of the braking spring 7G, thereby holding the rotating body 7C between the side plate 7E and the movable piece 7B. By doing so, the rotation of the rotating body 7C is braked.

  The diagnostic device 8 for the magnet brake 7 according to one embodiment of the present invention shown in FIG. 3 provides a torque command for controlling the drive by giving a drive torque command to the electric motor 2 in order to control the acceleration and deceleration of the escalator. Means 9A, monitor means 9B for monitoring torque output information (motor drive output information) output by a drive torque command, and the rotational speed of the input side shaft 4A of the speed reducer 4 on which the magnet brake 7 is supported are detected. A rotation detection means 10 comprising a rotation detector, a coil operation detection means 11B for detecting the start of current supply to the electromagnetic coil 7F, and a rotation detection means from a current supply start detection detected by the coil operation detection means 11B. Drive shaft rotation start detection for detecting a first time T1 (hereinafter referred to as drive shaft rotation start time T1) until 10 detects rotation. The second time T2 from when the start of current supply detected by the means 12 and the coil operation detecting means 11B until the torque command output value detected by the monitoring means 9B starts to rise (hereinafter referred to as rise start time T2). Is comprised of at least a torque command increase start detection means 13 for detecting the operating state of the magnet brake 7 and a first diagnosis means 14 for diagnosing the operating state of the magnet brake 7.

  As shown in FIG. 3, the inverter device 9 provides a torque command means 9A for giving a drive torque command to the motor 2 to control the motor 2, and torque output information (motor) output by the drive torque command of the torque command means 9A. The monitor means 9B for monitoring the drive output information) and the voltage value calculation means 9C for calculating the voltage value applied to the magnet brake 7 are at least included. As shown in FIG. 3, the passenger conveyor control device 11 is a CPU (central processing unit) 11 </ b> A that controls the order of driving of the motor 2 and the start of current supply to the magnet brake 7 according to the command of the inverter device 9. And a coil operation detecting means 11B for detecting the start of current supply to the electromagnetic coil 7F of the magnet brake 7 are included. As shown in FIG. 3, the diagnosis result by the first diagnosis means 14 is transmitted to a monitoring center 15 installed in a remote place. The monitoring center 15 stores the diagnosis result transmitted from the first diagnosis means 14 and monitors the operation state of the magnet brake 7.

  The first diagnosing means 14 includes the current drive shaft rotation start time T1 detected by the drive shaft rotation start detection means 12 at the time of diagnosis or the current increase start time T2 detected by the torque command output increase start detection means 13 at the time of diagnosis. The operation state of the magnet brake 7 is diagnosed from both the comparison result of at least one time and the normal time value (hereinafter referred to as a normal value) and the voltage value calculated by the voltage value calculation means 9C of the inverter device 9. When either the drive shaft rotation start time T1 or the rise start time T2 is equal to or greater than the normal value, the stroke of the magnet brake 7 is diagnosed as abnormal, and the drive shaft rotation start time T1 or the rise start time T2 If any of the times is less than the normal value, the operation state of the magnet brake 7 is within the control value and the magnet It is configured to diagnose that the stroke of the brake 7 is normal. Here, the normal value refers to the current supply detected by the coil operation detecting means 11B, which is obtained when the magnet brake 7 is not deteriorated or worn when the passenger conveyor is newly installed (initial state). Time T01 (hereinafter referred to as normal drive start time T01) corresponding to about 130% of the time from the start detection until the rotation detection means 10 detects rotation, or the start detection of current supply detected by the coil operation detection means 11B. To a time corresponding to about 130% of the time until the torque command output value detected by the monitoring means 9B starts to rise (hereinafter referred to as a normal rise start time T02). This normal value is detected (measured) when a passenger conveyor is newly installed, and is stored in the first diagnostic means 14 in advance. In this embodiment, the normal drive start time T01 is set to 300 ms, and the normal rise start time T02 is set to 350 ms.

  The characteristics obtained by the diagnostic device 8 for the magnet brake 7 according to the above-described embodiment and showing the relationship between the torque command output, the rotation detector output, the brake operation signal output, and the time are as shown in FIG. That is, when the brake operation signal is output as shown in FIG. 4, when the drive shaft rotation start time T1 elapses from the start of the output, the rotation detector output is made, and further, the rise starts from the start of the output of the brake operation signal. When the time T2 elapses, the torque command output starts to increase.

  Next, the flow of the diagnostic operation by the diagnostic device 8 of the magnet brake 7 according to the above embodiment will be described based on FIG.

  First, in step S1 of FIG. 5, it is determined whether an activation command (torque command) has been given to the escalator (passenger conveyor). If it is determined in step S1 of FIG. 5 that an activation command (torque command) has been given to the escalator (passenger conveyor), the process proceeds to step S2 of FIG. 5 to determine whether or not the magnet brake 7 is in a braking state. The If it is determined in step S2 in FIG. 5 that the vehicle is in a braking state, the process proceeds to step S3 in FIG.

  Next, in step S3 in FIG. 5, torque is applied by giving a torque command to the electric motor 2 from the torque command means 9A of the inverter device 9 while the magnet brake 7 is in a braking state. The torque at this time is 10% to 100% of the rated torque at which the belt 3 and the magnet brake 7 do not slip.

  Next, in step S4 in FIG. 5, the CPU 11A of the passenger conveyor control device 11 supplies current to the magnet brake 7 to release the magnet brake 7, and then proceeds to step S5 in FIG. The operating voltage (driving voltage) value is calculated. Here, the brake is released in a state where the torque is applied to the electric motor 2 because there is no play after the rotating body 7C is opened until the input side shaft 4A of the speed reducer 4 starts rotating. This is because the drive shaft rotation start time T1 and the rise start time T2 can be accurately detected.

  Next, in step S6 of FIG. 5, detection of the start of current supply to the electromagnetic coil 7F of the magnet brake 7 by the coil operation detection means 11B of the inverter device 9 and the output value of the rotation detection means 10 comprising the rotation detector (rotation detector). Output), the drive shaft rotation start detection means 12 is used to detect the drive shaft rotation start time T1, and then the process proceeds to step S7 of FIG. 5 and the electromagnetic coil 7F of the magnet brake 7 is detected by the coil operation detection means 11B of the inverter device 9. The rise start time T2 is detected by using the torque command output rise start detecting means 13 from the detection of the current supply start to the torque and the torque command output value detected by the monitor means 9B. Here, if one or both of the side plate 7E and the movable piece 7B of the magnet brake 7 are worn over time, the brake stroke until the braking state is released increases, and the drive shaft rotation start time T1 and the start of the lift are increased. Time T2 becomes longer. That is, as the brake stroke increases, the physical operation amount of the brake required until the movable piece 7B moves away from the rotating body 7C also increases, so that the drive until the input side shaft 4A of the speed reducer 4 starts to rotate is driven. The shaft rotation start time T1 becomes longer. When the physical operation amount of the brake required until the movable piece 7B moves away from the rotating body 7C also increases, the torque command output of the electric motor 2 is actually started after the current supply to the electromagnetic coil 7F of the magnet brake 7 is started. The time until the value starts to rise, that is, the rise start time T2 becomes longer.

  Next, in step S8 in FIG. 5, the drive shaft rotation start time T1 detected in step S6 in FIG. 5 and the rise start time T2 detected in step S7 in FIG. At the same time, it is determined whether or not the drive shaft rotation start time T1 or the rise start time T2 is equal to or greater than the normal value (the normal drive start time T01 or the normal rise start time T02) stored in advance in the first diagnosis means 14.

  If it is determined in step S8 in FIG. 5 that the drive shaft rotation start time T1 is less than the normal drive start time T01 or the rise start time T2 is less than the normal rise start time T02, the process proceeds to step S9 in FIG. 7 is determined to be within the management value, and the determination result is transmitted to the monitoring center 15 as shown in step S16 of FIG. 5, and the monitoring center 15 determines in step S9 of FIG. Store the result.

  If it is determined in step S8 of FIG. 5 that the drive shaft rotation start time T1 is equal to or greater than the normal drive start time T01 or the increase start time T2 is equal to or greater than the normal increase start time T02, the process proceeds to step S10 in FIG. It is determined whether or not the operating voltage of the magnet brake 7 is normal.

  Next, if the operating voltage of the magnet brake 7 is normal in step S10 in FIG. 5, the process proceeds to step S11 in FIG. 5 to determine the drive shaft rotation start time T1 or the rise start time T2 detected (measured) in the past. It is determined whether or not the weighted average value exceeds the normal value, that is, the normal drive start time T01 or the normal rise start time T02.

  Next, when it is determined in step S11 in FIG. 5 that the weighted average value of the drive shaft rotation start time T1 or the rise start time T2 exceeds the normal drive start time T01 or the normal rise start time T02, The process proceeds to step S12 in FIG. 5, where it is determined that the magnet brake 7 is abnormal in operation, and the determination result is transmitted to the monitoring center 15 as shown in step S16 in FIG. The determination result of step S12 is stored.

  Further, in step S11 of FIG. 5, it is determined that the weighted average value of the values of the drive shaft rotation start time T1 or the rise start time T2 does not exceed the normal value, that is, the normal drive start time T01 or the normal rise start time T02. If it is determined, the process proceeds to step S9 in FIG. 5, and the operation state of the magnet brake 7 is determined to be within the control value, and the determination result is transmitted to the monitoring center 15 as shown in step S16 in FIG. And stored in the monitoring center 15.

  If it is determined in step S10 in FIG. 5 that the operating voltage of the magnet brake 7 is not normal, the process proceeds to step S13 in FIG. ) Determine whether the above occurred. If it is determined in step S13 in FIG. 5 that the abnormality in the operating voltage of the magnet brake 7 has occurred a predetermined number of times (for example, three times) or more, the process proceeds to step S14 in FIG. It is determined that the voltage is abnormal, and the determination result is transmitted to the monitoring center 15 as shown in step S16 of FIG. 5, and the determination result of step S14 of FIG.

  If it is determined in step S13 in FIG. 5 that the operating voltage abnormality of the magnet brake 7 has not occurred more than a predetermined number of times (for example, three times), the process proceeds to step S15 in FIG. It is confirmed that there is an abnormality in the operating voltage of the magnet brake 7 by performing a process that does not add a weighted average to the drive shaft rotation start time T1 detected in step S6 and the rise start time T2 detected in step S7 of FIG. As shown in step S <b> 16 of FIG. 5, the data is transmitted to the monitoring center 15 and stored in the monitoring center 15. Step S13 in FIG. 5 prevents the diagnosis of the magnet brake 7 from being diagnosed when a voltage abnormality occurs due to the power usage state of the building where the escalator is installed.

  According to the diagnostic device 8 of the magnet brake 7 having the above-described configuration, by using the passenger conveyor control device 11 and the inverter device 9 that are already installed in the passenger conveyor without providing a dedicated current detector, Since the operation state can be diagnosed, the cost can be reduced and the operation state of the magnet brake 7 can be diagnosed without depending on the skill and experience of the maintenance worker. It is possible to reduce the labor of diagnosis work.

  Furthermore, according to the diagnostic device 8 for the magnet brake 7 having the above-described configuration, the magnet brake 7 is attracted in a state where torque is previously applied to the electric motor 2, and the drive shaft rotation start time T1 and the torque output increase start time T2 at this time are attracted. With this change, the operating state of the magnet brake 7 can be monitored, and the magnet brake 7 can be maintained properly at all times.

  Next, a diagnostic device 20 according to another embodiment of the magnet brake 7 will be described with reference to FIGS. 6-7, the same code | symbol as FIGS. 1-5 represents the same content.

  As shown in FIG. 6, a diagnostic apparatus 20 according to another embodiment of the present invention replaces the first diagnostic means 14 of the diagnostic apparatus 7 according to the above-described embodiment with a time difference rate calculating means 21 and a second diagnostic means 22. Is provided. The time difference rate calculation means 21 has a function of calculating a ratio T1 / T2 between the drive shaft rotation start time T1 and the rise start time T2.

  6 compares the ratio T1 / T2 (calculated time difference ratio) calculated by the time difference rate calculating means 21 with a normal time difference (hereinafter referred to as a set value), and the ratio T1 / T2 is determined. When the stroke is greater than the set value, it is diagnosed that the stroke of the magnet brake 7 is abnormal, and when the ratio T1 / T2 is less than the set value, the operating state of the magnet brake 7 is within the control value and the magnet brake 7 is configured to diagnose that the stroke of 7 is normal. Here, the set value is obtained from the start of current supply detected by the coil operation detecting means 11B, which is obtained in the state (initial state) in which the magnet brake 7 is not deteriorated or worn when the passenger conveyor is newly installed. About the ratio of the time until the rotation detecting means 10 detects rotation and the time from the start of the current supply detected by the coil operation detecting means 11B until the torque command output value detected by the monitoring means 9B starts increasing. Say 150%. This set value is detected (measured) when a passenger conveyor is newly installed, and is stored in the second diagnostic means 22 in advance.

  Next, the flow of the diagnostic operation by the diagnostic apparatus 20 according to the other embodiment will be described with reference to FIG. Note that steps S1 to S7 and steps S9 to S16 shown in FIG. 7 are exactly the same as steps S1 to S7 and steps S9 to S16 of FIG.

  The flow of the diagnostic operation by the diagnostic device 8 according to the above-described embodiment and the flow of the diagnostic operation by the diagnostic device 20 according to the above-described other embodiments are the former being step S8 in FIG. Step S8A is different. That is, in step S8 in FIG. 5, the drive shaft rotation start time T1 detected in step S6 in FIG. 5 and the rise start time T2 detected in step S7 in FIG. At the same time, it is determined whether or not the drive shaft rotation start time T1 or the rise start time T2 is equal to or greater than the normal value (the normal drive start time T01 or the normal rise start time T02) stored in advance in the first diagnosis means 14. On the other hand, in step S8A in FIG. 7, the drive shaft rotation start time T1 detected in step S6 in FIG. 7 and the rise start time T2 detected in step S7 in FIG. The ratio (T1 / T2) between the second time and the drive shaft rotation start time T1 is calculated, the calculated ratio (T1 / T2) is compared with the set value, and the ratio (T1 It is determined whether or not / T2) is equal to or greater than a set value.

  If the ratio (T1 / T2) is greater than or equal to the set value, the process proceeds to step S10 in FIG. 7, and if the ratio (T1 / T2) is less than the set value, the process proceeds to step S16 in FIG.

  In the diagnostic device 20 according to the other embodiment, after the current is supplied to the magnet brake 7, the input side shaft 4 </ b> A of the speed reducer 4 is before the movable piece 7 </ b> B of the magnet brake 7 is physically attracted completely. Since it rotates while contacting the movable piece 7B, the drive shaft rotation start time T1 becomes longer as the brake stroke becomes larger, but the amount of change (inclination) becomes smaller. On the other hand, the torque output value commanded to the electric motor 2 after starting the current supply to the magnet brake 7 starts to rise after the movable piece 7B of the magnet brake 7 is physically attracted completely. Therefore, the second time T2 (rise start time) becomes longer, but as the brake stroke increases, the drive shaft rotation start time T1 becomes longer, but the amount of change (slope) becomes larger. Therefore, as the brake stroke increases, the ratio (T1 / T2) also increases. Therefore, when this ratio (T1 / T2) exceeds the set value, it is possible to diagnose a stroke abnormality of the magnet brake 7.

  As described above, the diagnostic device 20 according to the other embodiment also uses the passenger conveyor control device 11 and the inverter device 9 that are already installed in the passenger conveyor without providing a dedicated current detector. 7 can be diagnosed, so that the cost can be reduced and the operation state of the magnet brake 7 can be diagnosed without depending on the skill and experience of the maintenance worker. It is possible to reduce the labor of diagnostic work for the person.

  Furthermore, according to the diagnostic device 20 according to another embodiment of the above configuration, it is not necessary to detect and store the normal drive start time T01 and the normal rise start time T02 that are necessary in the diagnostic device 8 according to the one embodiment. Therefore, it is possible to reduce the cost and reduce the labor of the maintenance worker's diagnosis work.

It is a principal part front view of the electric motor drive part of the passenger conveyor which concerns on one Embodiment of this invention. It is a principal part side view of the magnet brake for passenger conveyors concerning one Embodiment of this invention. It is a functional block diagram which shows the structure of the diagnostic apparatus of the magnet brake for passenger conveyors concerning one Embodiment of this invention. It is a characteristic view which shows the relationship between each output and time which are concerned with one Embodiment of this invention and are obtained by the diagnostic apparatus of the magnet brake for passenger conveyors. It is a flowchart for demonstrating the flow of the diagnostic operation | movement by the diagnostic apparatus of the magnet brake for passenger conveyors concerning one Embodiment of this invention. It is a functional block diagram which shows the structure of the diagnostic apparatus of the magnet brake for passenger conveyors concerning other embodiment of this invention. It is a flowchart for demonstrating the flow of the diagnostic operation | movement by the diagnostic apparatus of the magnet brake for passenger conveyors concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor drive part of a passenger conveyor 2 Electric motor 3 Belt 4 Reducer 4A Input side shaft 4B Output side shaft 5 Power chain 6 Drive sprocket 7 Passenger conveyor magnet brake 7A Core 7B Movable piece 7C Rotating body 7D Fastener 7E Side plate 7F Electromagnetic Coil 7G Brake spring 8 Passenger conveyor magnet brake diagnostic device (one embodiment)
9 Inverter device 9A Torque command means 9B Monitor means 10 Rotation detection means 11 Passenger conveyor control device 11A CPU
11B Coil operation detection means 12 Drive shaft rotation start detection means 13 Torque command increase start detection means 14 First diagnosis means 15 Monitoring center 20 Diagnosis device for passenger conveyor magnet brake (other embodiment)
21 Time difference rate calculating means 22 Second diagnostic means T1 First time (drive shaft rotation start time)
T2 2nd time (rise start time)
T01 Regular drive start time T02 Regular rise start time

Claims (4)

  The driving force of the electric motor is transmitted via a speed reducer and the rotating piece that presses the rotating member to brake the rotating member, and the current is supplied to attract the moving member by magnetic force to rotate the rotating member. In a diagnostic device for diagnosing the operating state of a passenger conveyor magnet brake comprising at least an electromagnetic coil for releasing body braking, torque command means for giving a drive torque command to the electric motor and controlling the drive, and Monitor means for monitoring torque output information output by a drive torque command, rotation detection means for detecting rotation of the input side shaft of the speed reducer, and coil operation detection means for detecting start of current supply to the electromagnetic coil And a drive shaft for detecting a first time from the start of current supply detection by the coil operation detection means until the rotation detection means detects rotation. A rotation start detection means; a torque command increase start detection means for detecting a second time from the start of current supply detection by the coil operation detection means until the torque command output value detected by the monitor means starts rising; When at least one of the first time and the second time is compared with a normal value, and the time of either the first time or the second time is equal to or greater than the normal value, the stroke of the magnet brake A diagnostic device for a magnet brake for a passenger conveyor, comprising at least first diagnostic means for diagnosing an abnormality.   The rotation detection means rotates from the detection of the start of current supply detected by the coil operation detection means when the normal value is obtained in the state where the magnet brake is not deteriorated or worn when the passenger conveyor is newly installed. About a time corresponding to about 130% of the time until detection or about the time until the torque command output value detected by the monitoring means starts rising from the start detection of the current supply detected by the coil operation detecting means 2. The diagnostic device for a magnet brake for a passenger conveyor according to claim 1, wherein the time corresponds to 130%.   Instead of the first diagnosis means, a time difference rate calculation means and a second diagnosis means are provided, and the time difference rate calculation means is configured to calculate a ratio between the first time and the second time, and the second The diagnosis unit is configured to compare the ratio calculated by the time difference rate calculation unit with a set value and diagnose a magnet brake stroke abnormality when the ratio is equal to or greater than the set value. Item 1. A diagnostic device for a magnet brake for a passenger conveyor according to Item 1.   The rotation detection means rotates from the detection of the start of current supply detected by the coil operation detection means when the set value is obtained when the magnet brake is not deteriorated or worn when a passenger conveyor is newly installed. About 150% of the ratio of the time until the detection of the torque command output value detected by the monitoring means to the time until the torque command output value detected by the monitoring means starts to rise. The diagnostic device for a magnet brake for a passenger conveyor according to claim 3.

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