JP2018154429A - Elevator control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the work load of a maintenance engineer by using a smoothing capacitor up to its appropriate life and to address an abnormality by announcing before breakage.SOLUTION: This elevator control device is provided with: a current voltage detection unit 21; a change rate detection unit 22; a charging/discharging rate detection unit 23; an abnormality determination unit 24; and an announcement unit 25. The current voltage detection unit 21 detects a current value or a voltage value of a smoothing capacitor 12 at the time of activating or stopping an elevator. The change rate detection unit 22 detects the change rate of the current value or the voltage value of the smoothing capacitor 12. The charging/discharging rate detection unit 23 detects the charging/discharging counts of the smoothing capacitor 12. The abnormality determination unit 24 determines the abnormality of the smoothing capacitor 12 on the basis of the change rate of the current value/voltage value and the charging/discharging counts. The announcement unit 25 announces that the smoothing capacitor 12 is in an abnormal state.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an elevator control device having a function of detecting an abnormality of a smoothing capacitor incorporated in an elevator drive system.

  The smoothing capacitor incorporated in the drive system of the elevator is deteriorated in performance as it is repeatedly charged and discharged, and therefore needs to be replaced periodically. Usually, the replacement standard of the smoothing capacitor is uniformly determined from the test result, and the replacement is performed in accordance with the replacement standard.

  For this reason, a smoothing capacitor incorporated in an elevator that is less frequently used may be replaced before the actual product life is reached. On the other hand, if any abnormality occurs in the smoothing capacitor before the replacement standard, the state may be overlooked and may be damaged. In particular, when a plurality of capacitors are used in series connection, the voltage applied to each capacitor becomes very high, which increases the possibility of breakage.

JP 2010-6568 A

  If the smoothing capacitor breaks during the operation of the elevator, the drive of the motor stops, and the car stops at an intermediate position between the floors, which may cause a confinement accident. In order to prevent such an accident, if the replacement time of the smoothing capacitor is set short, maintenance parts replacement work increases.

  The problem to be solved by the present invention is to reduce the work burden on maintenance personnel by using a smoothing capacitor until the appropriate life, and when an abnormality occurs, it can be reported before the breakage and dealt with. An elevator control device is provided.

  An elevator control device according to an embodiment includes a converter device that converts an alternating voltage supplied from a commercial power source into a direct current, a smoothing capacitor that smoothes the direct current voltage converted by the converter device by a charge / discharge operation, A drive device including an inverter device that converts a direct current voltage smoothed by a smoothing capacitor into an alternating current necessary for driving the hoisting machine is controlled.

  The elevator control device includes a first detection unit that detects a current value or a voltage value of the smoothing capacitor when the elevator is started or stopped, and a change in the current value or the voltage value detected by the first detection unit. A second detecting means for detecting the rate, a third detecting means for detecting the number of times of charging / discharging of the smoothing capacitor, and a change rate and charging rate of the current value or voltage value obtained by the first to third detecting means. An abnormality determining means for determining an abnormality of the smoothing capacitor based on the number of discharges, and an issuing means for notifying that when the smoothing capacitor is determined to be in an abnormal state by the abnormality determining means. Configured.

FIG. 1 is a diagram illustrating a configuration of an elevator control apparatus according to the first embodiment. FIG. 2 is a view showing the structure of an element of an aluminum electrolytic capacitor used as a smoothing capacitor in the first embodiment. FIG. 3 is a view showing a state in which the aluminum electrolytic capacitor is sealed with an element aluminum case and a sealing material. FIG. 4 is a diagram illustrating a change in current when the smoothing capacitor according to the first embodiment is repeatedly charged and discharged. FIG. 5 is a diagram showing a change in current when the smoothing capacitor in the first embodiment is repeatedly charged and discharged in an abnormal state. FIG. 6 is a flowchart showing the processing operation of the elevator control apparatus according to the first embodiment. FIG. 7 is a diagram showing the configuration of the elevator control apparatus according to the second embodiment. FIG. 8 is a diagram for explaining a voltage sharing ratio between two smoothing capacitors in the second embodiment. FIG. 9 is a diagram showing the configuration of the elevator control apparatus according to the third embodiment. FIG. 10 is a diagram illustrating a configuration of an elevator control device according to the fourth embodiment. FIG. 11 is a diagram illustrating ripple voltage characteristics of the smoothing capacitor according to the fourth embodiment. FIG. 12 is a diagram illustrating a configuration of an elevator control apparatus according to the fifth embodiment. FIG. 13 is a diagram showing current characteristics of the smoothing capacitor at the start of power supply in the fifth embodiment. FIG. 14 is a diagram showing a configuration of an elevator control apparatus according to the sixth embodiment. FIG. 15 is a diagram showing a time change of the current flowing through the smoothing capacitor in the sixth embodiment. FIG. 16 is a diagram illustrating a configuration of an elevator control device according to the seventh embodiment. FIG. 17 is a graph showing the charging characteristics of the smoothing capacitor in the seventh embodiment. FIG. 18 is a diagram showing the discharge characteristics of the smoothing capacitor in the seventh embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration of an elevator control apparatus according to the first embodiment.

  The elevator in the present embodiment includes a drive device 10 and an elevator control device 20. The drive device 10 includes a converter device 11, a smoothing capacitor 12, and an inverter device 13, and supplies power necessary for driving the hoisting machine 2 in accordance with a drive instruction from the elevator control device 20.

  The converter device 11 converts an AC voltage supplied from the commercial power supply 1 into a full-wave rectified DC. The commercial power source 1 is a three-phase AC power source. The smoothing capacitor 12 is provided between the DC buses between the converter device 11 and the inverter device 13, smoothes ripples included in the DC voltage converted by the converter device 11, and supplies the smoothed ripple to the inverter device 13. As the smoothing capacitor 12, for example, an aluminum electrolytic capacitor is used. The inverter device 13 converts the DC voltage supplied from the converter device 11 through the smoothing capacitor 12 into an alternating current having a frequency and a voltage value necessary for driving the hoisting machine 2 by PWM (Pulse Width Modulation) control. Is supplied to the hoist 2 as drive power.

  In addition, a DC circuit between the rectifier 5 and the smoothing capacitor 12 is provided with a charging circuit 14 for charging the smoothing capacitor 12. A DC circuit between the smoothing capacitor 12 and the inverter device 13 is provided with a discharge circuit 15 for discharging the smoothing capacitor 12.

  The hoisting machine 2 is composed of a synchronous motor, and rotates by power supply from the driving device 10. A rope 3 is wound around the hoisting machine 2 through a sheave (not shown), and a rope 4 is connected to one end of the rope 3 and a counterweight 5 is connected to the other end. Thereby, with the rotation of the hoist 2, the car 4 and the counterweight 5 are lifted and lowered via the rope 3.

  The elevator control device 20 controls the entire elevator including drive control of the drive device 10. In the present embodiment, the elevator control device 20 includes a current / voltage detection unit 21, a change rate detection unit 22, a charge / discharge number detection unit 23, and an abnormality determination unit 24 as functions for detecting an abnormal state of the smoothing capacitor 12. The alarm unit 25, the operation control unit 26, and the inverter drive unit 27 are provided.

  The current / voltage detector 21 detects a current value Ic or a voltage value Vc of charge / discharge of the smoothing capacitor 12 when the elevator is started or stopped. The change rate detection unit 22 detects the change rate Pc of the current value Ic or the voltage value Vc detected by the current / voltage detection unit 21. The charge / discharge number detection unit 23 detects the charge / discharge number Nc of the smoothing capacitor 12.

  The “change rate Pc” is a ratio indicating a time change from the initial value of the current value Ic or the voltage value Vc due to charging / discharging of the smoothing capacitor 12. The “number of times of charging / discharging Nc” is the number of repetitions of charging / discharging per unit time of the smoothing capacitor 12.

  The abnormality determination unit 24 determines abnormality of the smoothing capacitor 12 based on the current value Ic or voltage value Vc of the smoothing capacitor 12, the rate of change Pc, and the number of charge / discharge times Nc. Specifically, the abnormality determination unit 24 determines that the value obtained by multiplying the current value Ic or voltage value Vc of the smoothing capacitor 12 by the coefficient of the rate of change Pc from the initial value exceeds a preset first threshold value Th1, and When the charge / discharge count Nc of the capacitor 12 exceeds the preset second threshold Th2, it is determined that the smoothing capacitor 12 is in an abnormal state.

  When the abnormality determination unit 24 determines that the smoothing capacitor 12 is in an abnormal state, the notification unit 25 issues a notification to that effect. The operation control unit 26 outputs a drive command to the inverter drive unit 27 in response to the hall call or the car call to drive the car 4 to the destination floor at a predetermined speed. At that time, when the abnormality of the smoothing capacitor 12 is reported by the reporting unit 25, the operation control unit 26, for example, the inverter drive unit 27 so as to decelerate the operation speed of the car 4 than during normal operation. A drive command is output to.

  The inverter drive unit 27 drives the inverter device 13 in accordance with a drive command from the operation control unit 26. Specifically, the inverter drive unit 27 performs ON / OFF control of a semiconductor switching element (not shown) in the inverter device 13 in accordance with a drive command from the operation control unit 26, drives the hoist 2 and drives the car 4 to a specified speed. To move to the destination floor.

  Here, (a) a mechanism of occurrence of abnormality of the smoothing capacitor and (b) a method of abnormality detection will be described.

(A) Mechanism of occurrence of abnormality in smoothing capacitor FIGS. 2 and 3 are diagrams for explaining the structure of an aluminum electrolytic capacitor, FIG. 2 is a diagram showing the structure of the element of the aluminum electrolytic capacitor, and FIG. It is a figure which shows the state sealed with the aluminum case and the sealing material.

As the smoothing capacitor 12, an aluminum electrolytic capacitor will be described as an example.
As shown in FIG. 2, the element 30 of the aluminum electrolytic capacitor includes an anode foil (aluminum beat) 31, an electrolytic paper (separator) 32, a cathode foil (aluminum beat) 33, an electrolytic paper (separator) 34, and electrode terminals 35 and 36. Consists of. The anode foil 31, the electrolytic paper 32, the cathode foil 33, and the electrolytic paper 34 are wound into a cylindrical shape, and the electrode terminals 35 and 36 are connected to the anode foil 31 and the cathode foil 33, respectively, in the winding process. The element 30 is impregnated with an electrolytic solution and sealed with an aluminum case 37 and a sealing material 38 as shown in FIG.

  In an aluminum electrolytic capacitor having such a structure, an abnormality occurs due to repeated charging and discharging as follows.

1. By repeated charge and discharge, the dissimilar metal (Fe) of the cathode tab is eluted as ions in the electrolyte. Normally, aluminum having a high purity (99% or more) is applied to the cathode foil 33, but a different metal of less than 1% may be eluted in the electrolytic solution.
2. Dissimilar metal (Fe) ions eluted in the electrolytic solution form a complex with the electrolytic solution solute and deposit on the opposing anode foil 31.
3. The above reaction is repeated every time the battery is charged / discharged, the amount of dissimilar metal deposited on the electrode tab increases, and the insulating property of the dielectric film on the anode foil 31 decreases.
4). Leakage current increases due to the lowering of the insulating properties of the dielectric film, alkalinization proceeds due to the generation of hydrogen gas on the cathode side, and aluminum in the cathode foil 34 is eluted due to the advanced alkalinization phenomenon, increasing the exposure of different metals. .
5. The above reaction is accelerated by the exposed dissimilar metal, and the leakage current of the anode foil 31 is accelerated. As a result, a short circuit occurs between the cathode and the anode, resulting in device damage.

(B) Method of Abnormality Detection The “abnormality” mentioned here is a state immediately before the smoothing capacitor 12 is damaged. That is, the capacitor performance deteriorates due to repeated charge and discharge, and there is a high risk of damage to the element if it is used continuously.

  The relationship between the charge / discharge current and voltage in the smoothing capacitor 12 and the number of charge / discharge cycles will be described. FIG. 4 is a diagram illustrating a change in current when the smoothing capacitor 12 is repeatedly charged and discharged in a normal state. FIG. 5 is a diagram illustrating a change in current when the smoothing capacitor 12 is repeatedly charged and discharged in an abnormal state.

  As the power is supplied from the commercial power source 1, the smoothing capacitor 12 is repeatedly charged and discharged, and the DC voltage is smoothed. When the smoothing capacitor 12 is in a normal state, the charging current and the discharging current are gently repeated as shown in FIG. When the number of charge / discharge times Nc per unit time increases, as shown in FIG. 4B, the rise and fall of the charge current and the discharge current become steep. At this time, if the current value Ic or the voltage value Vc varies little, there is no problem even if it is used as it is.

  On the other hand, FIG. 5 shows a state where the smoothing capacitor 12 is in an abnormal state. FIGS. 5A and 5B show waveforms when the charge / discharge current value is high, and FIGS. 5C and 5D show waveforms when the charge / discharge current value is low.

  As the smoothing capacitor 12 deteriorates and the capacity for storing charges decreases, the rise and fall of the charge current and discharge current become steep, and the number of charge / discharge cycles Nc per unit time also increases. In this case, when the current value Ic is repeated from the state where the current value Ic is low as shown in FIG. 5C and the current value Ic becomes high as shown in FIG. The load is highest and the risk of breakage increases.

  As described above, the smoothing capacitor abnormality occurs due to the relationship between the charge / discharge current value Ic, the voltage value Vc, and the charge / discharge frequency Nc. Further, since the current value Ic and the voltage value Vc for charging / discharging are more likely to be abnormal as the time change is steeper, the rate of change Pc is also affected.

  Therefore, in the present embodiment, the charge / discharge current value Ic (including the maximum value such as the surge current), the voltage value Vc (including the maximum value such as the surge voltage), and the charge / discharge frequency Nc are detected at a predetermined measurement timing. .

  The “predetermined measurement timing” specifically includes when the elevator is started (when power supply is started) or when the elevator is stopped (when power supply is stopped). “When the elevator is activated” includes a time when the car 4 starts operation in response to a call from a state where the car 4 is stopped at an arbitrary floor. “When the elevator stops” includes the time when the car 4 stops on each floor. When the elevator is started or stopped, the measurement timing is set so that the load on the smoothing capacitor 12 is greater than when the elevator is operating normally, and the current value Ic and the voltage value Vc change significantly over time. It is because it is easy to appear.

  Since the rate of change Pc is also related to the charge / discharge current value Ic and the voltage value Vc, the value obtained by multiplying the current value Ic and the voltage value Vc (whichever is sufficient) by the coefficient of the rate of change Pc from the initial value. And the deterioration state (abnormal state) of the smoothing capacitor 12 is estimated from the two conditions of the charge / discharge number Nc.

  Next, the operation of this embodiment will be described.

  FIG. 6 is a flowchart showing the processing operation of the elevator control apparatus according to the first embodiment.

  When power supply is started from the commercial power source 1 when the elevator is started, the voltage converted from alternating current to direct current by the converter device 11 is smoothed by charging and discharging of the smoothing capacitor 12 and then applied to the inverter device 13. An AC voltage having a predetermined frequency is generated by ON / OFF control of a semiconductor switching element (not shown) in the inverter device 13 and supplied to the hoisting machine 2. Thereby, the hoisting machine 2 is rotationally driven, and the car 4 is moved up and down via the rope 3.

  Here, at the time of starting the elevator (Yes in step S11), the current / voltage detection unit 21 of the elevator control device 20 detects the current value Ic and the voltage value Vc during charging / discharging of the smoothing capacitor 12 (step S12). Further, the change rate detection unit 22 detects the change rate Pc from the initial values of the current value Ic and the voltage value Vc detected by the current / voltage detection unit 21 (step S13).

  For example, in a state in which the constituent material of the smoothing capacitor 12 is deteriorated and the capacity is reduced, the voltage rises in a short time from the start of charging. Conversely, the voltage drops in a short time from the start of discharge. That is, the charge / discharge time constant is high, and the current / voltage fluctuation is severe. Therefore, the deterioration state of the smoothing capacitor 12 can be determined by obtaining the rate of change Pc from the initial time.

  On the other hand, the charge / discharge frequency detection unit 23 detects the charge / discharge frequency Nc of the smoothing capacitor 12 via the charging circuit 14 and the discharging circuit 15 provided on the DC line of the driving device 10 (step S14). As shown in FIG. 5, when the smoothing capacitor 12 is deteriorated, the number of times of charge / discharge per unit time increases.

  The abnormality determination unit 24 performs abnormality determination based on the current value Ic or voltage value Vc of the smoothing capacitor 12 and the rate of change Pc thereof, and the charge / discharge count Nc (step S15). Specifically, the abnormality determination unit 24 compares the value obtained by multiplying the current value Ic or voltage value Vc of the smoothing capacitor 12 by the coefficient of the rate of change Pc from the initial value and a first threshold value Th1 set in advance. The charging / discharging frequency Nc of the capacitor 12 is compared with a preset second threshold Th2.

  The first threshold value Th1 and the second threshold value Th2 are set to optimum values by experiments or the like. Since specific numerical values vary depending on the specifications of the smoothing capacitor 12, the operating time of the elevator, and the like, they are omitted here.

  Here, when the value obtained by multiplying the current value Ic or the voltage value Vc by the coefficient of the change rate Pc exceeds the first threshold Th1 and the number of charge / discharge times Nc exceeds the second threshold Th2, the abnormality determination unit 24 is determined to be in an abnormal state due to deterioration of the smoothing capacitor 12. If at least one is within the threshold value, the abnormality determination unit 24 determines that the smoothing capacitor 12 is in a normal state.

  When it is determined that the smoothing capacitor 12 is in an abnormal state (Yes in step S16), the elevator control device 20 performs a protection operation (step S17). That is, the elevator control device 20 issues a notification that the smoothing capacitor 12 is in an abnormal state through the notification unit 25. Specifically, for example, an inspection lamp (not shown) installed in a machine room is turned on, and a warning is issued to a monitoring room in a building or an external monitoring center via a communication line. This notification allows the smoothing capacitor 12 to be replaced when the maintenance staff performs maintenance inspection of the elevator.

  Further, when the smoothing capacitor 12 is in an abnormal state, the elevator control device 20 temporarily stops the operation of the elevator through the operation control unit 26. Since the load on the smoothing capacitor 12 is reduced by temporarily stopping the operation of the elevator, the operation can be resumed. However, when the situation where the threshold values Th1 and Th2 are exceeded many times when the operation is restarted, it is preferable to completely stop the operation of the elevator and wait for the arrival of maintenance personnel.

  In addition, when the number of charge / discharge times Nc increases abruptly, thereafter, the second threshold value Th2 may be raised from the initial set value to determine whether the smoothing capacitor 12 is abnormal.

  Although FIG. 6 has been described on the assumption that the elevator is started, the same applies when the elevator is stopped. That is, even when the car 4 is stopped at each floor, a large load is applied to the smoothing capacitor 12. Therefore, by detecting the charge / discharge current / voltage, the rate of change Pc, and the number Nc of charge / discharge, the detected values Therefore, the abnormality of the smoothing capacitor 12 can be detected.

  As described above, according to the first embodiment, the smoothing capacitor 12 can be used until the end of its life by detecting the abnormality of the smoothing capacitor 12 from the rate of change of charge / discharge current and voltage and the number of times of charge and discharge. You can be alerted and dealt with before it breaks.

(Second Embodiment)
Next, a second embodiment will be described.

  In the second embodiment, in a configuration in which at least two smoothing capacitors are connected in series, abnormality determination is performed in consideration of the voltage sharing ratio of these smoothing capacitors.

  FIG. 7 is a diagram showing the configuration of the elevator control apparatus according to the second embodiment. In addition, the same code | symbol is attached | subjected to the same part as FIG. 1 in the said 1st Embodiment, and the description is abbreviate | omitted.

  In the driving device 10 in the second embodiment, two smoothing capacitors 12 a and 12 b are connected in series between the DC buses between the converter device 11 and the inverter device 13. In general, since the input voltage is very high, the voltage is divided by connecting two smoothing capacitors 12a and 12b in series. The smoothing capacitors 12a and 12b have the same specifications including the capacitance. For example, when the input voltage is 700V, the terminal voltages of the smoothing capacitors 12a and 12b are 350V, respectively. In the example of FIG. 7, two smoothing capacitors are connected in series, but a configuration in which a larger number of smoothing capacitors are connected in series may be used.

  Further, the elevator control device 20 includes a current / voltage detection unit 21, a change rate detection unit 22, a charge / discharge number detection unit 23, an abnormality determination unit 24, a notification unit 25, an operation control unit 26, and an inverter drive unit 27. A voltage sharing ratio detection unit 41 is provided. As shown in FIG. 8, the voltage sharing ratio detection unit 41 detects the voltages Va and Vb of the smoothing capacitors 12a and 12b connected in series between the DC buses, and calculates the voltage sharing ratio RE of the voltages Va and Vb. To do.

Voltage sharing ratio RE = Vb / Va
If the deterioration of one of the two smoothing capacitors 12a and 12b progresses, the impedance value of the smoothing capacitor that has deteriorated changes, so the voltage sharing ratio RE = Vb / Va changes. Accordingly, the deterioration state of the smoothing capacitors 12a and 12b can be determined from the voltage sharing ratio RE. Actually, since it is unclear which smoothing capacitors 12a and 12b are deteriorated, the amount of change from the initial value is adopted.

  In such a configuration, the charging / discharging current value Ic, voltage value Vc, and charging / discharging frequency Nc of each of the smoothing capacitors 12a and 12b are detected at a predetermined measurement timing (when the elevator is started / stopped). Furthermore, in this embodiment, the voltage sharing ratio RE of the smoothing capacitors 12a and 12b is detected by the voltage sharing ratio detection unit 41 provided in the elevator control device 20.

  The abnormality determination unit 24 determines abnormality of the smoothing capacitors 12a and 12b based on these detection values. Specifically, the abnormality determination unit 24 compares the current value Ic or the voltage value Vc of each of the smoothing capacitors 12a and 12b with a coefficient of the change rate Pc and a preset first threshold value Th1, and smoothes the smoothing. The charging / discharging frequency Nc of the capacitors 12a and 12b is compared with a preset second threshold Th2.

  Moreover, the abnormality determination part 24 has 3rd threshold value Th3 for performing abnormality determination from voltage sharing rate RE of smoothing capacitor 12a, 12b. The third threshold value Th3 is set to an optimal value through experiments or the like. Since specific numerical values vary depending on the capacity of the smoothing capacitors 12a and 12b, the operating time of the elevator, and the like, they are omitted here. If both the smoothing capacitors 12a and 12b are in a normal state, Va = Vb and RE = 1.0. On the other hand, if the deterioration of one of the smoothing capacitors 12a and 12b is progressing, the voltage sharing ratio RE is disturbed by a voltage change, and therefore RE> 1 or RE <1. The greater the deterioration, the greater the voltage sharing ratio RE deviates from the threshold Th3.

  The abnormality determination unit 24 determines abnormality of the smoothing capacitors 12a and 12b using the three conditions of the threshold value Th1, the threshold value Th2, and the threshold value Th3. That is, in a state where the value obtained by multiplying the current value Ic or the voltage value Vc by the coefficient of the change rate Pc exceeds the first threshold Th1 and the number of charge / discharge Nc exceeds the second threshold Th2, the voltage sharing is further performed. When the rate RE is out of the range of the threshold Th3, the abnormality determination unit 24 determines that one of the smoothing capacitors 12a and 12b is in an abnormal state due to deterioration.

  Note that the threshold value Th1 of the current value Ic and the threshold value Th2 of the voltage value Vc are reset according to the determination result of the threshold value Th3 of the voltage sharing ratio RE (for example, the threshold values Th1 and Th2 when the voltage sharing ratio RE exceeds the threshold value Th3) The smoothing capacitor 12 may be determined to be abnormal based on the threshold value Th1 and the threshold value Th2 after the resetting.

  When it is determined that the smoothing capacitor 12 is in an abnormal state, the elevator control device 20 performs a protective operation. That is, the elevator control device 20 issues a notification that the smoothing capacitor 12 is in an abnormal state through the notification unit 25. Specifically, for example, an inspection lamp (not shown) installed in a machine room is turned on, and a warning is issued to a monitoring room in a building or an external monitoring center via a communication line. By this notification, the maintenance capacitor can replace the smoothing capacitors 12a and 12b when performing maintenance inspection of the elevator.

  As described above, according to the second embodiment, in the configuration in which the two smoothing capacitors 12a and 12b are connected in series, in addition to the charge / discharge current / voltage change rate and the charge / discharge frequency, the voltage sharing rate is further considered. By performing the abnormality determination, it is possible to detect the abnormality of the smoothing capacitors 12a and 12b more accurately. As a result, the smoothing capacitor 12 can be used until the end of its life, and can be reported and dealt with before the element is damaged due to deterioration.

(Third embodiment)
Next, a third embodiment will be described.

  In the third embodiment, in addition to the configuration of the first embodiment, the temperature which is one of the characteristics of the smoothing capacitor is detected, and the abnormality is determined in consideration of the detected temperature. .

  FIG. 9 is a diagram showing the configuration of the elevator control apparatus according to the third embodiment. In addition, the same code | symbol is attached | subjected to the same part as FIG. 1 in the said 1st Embodiment, and the description is abbreviate | omitted.

  The elevator control device 20 according to the third embodiment includes a current / voltage detection unit 21, a change rate detection unit 22, a chargeable / discharge number detection unit 23, an abnormality determination unit 24, a notification unit 25, an operation control unit 26, and an inverter drive. In addition to the unit 27, a temperature detection unit 42 is provided. The temperature detection unit 42 detects the temperature (internal temperature, surface temperature, ambient temperature, etc.) TE of the smoothing capacitor 12 through a temperature sensor such as a thermocouple (not shown) attached to the smoothing capacitor 12.

  The temperature rise of the smoothing capacitor 12 is caused by the fact that the resistance value increases due to the deterioration of the constituent materials of the element and heat is generated during charging and discharging. Therefore, the deterioration state of the smoothing capacitor 12 can be determined by detecting this temperature rise.

  In such a configuration, the charging / discharging current value Ic, voltage value Vc, and charging / discharging frequency Nc of the smoothing capacitor 12 are detected at a predetermined measurement timing (when the elevator is started / stopped). Furthermore, in this embodiment, the temperature TE of the smoothing capacitor 12 is detected by the temperature detection unit 42 provided in the elevator control device 20.

  The abnormality determination unit 24 determines abnormality of the smoothing capacitor 12 based on these detection values. Specifically, the abnormality determination unit 24 compares the value obtained by multiplying the current value Ic or voltage value Vc of the smoothing capacitor 12 by the coefficient of the rate of change Pc from the initial value and a first threshold value Th1 set in advance. The charging / discharging frequency Nc of the capacitor 12 is compared with a preset second threshold Th2.

  Further, the abnormality determination unit 24 has a fourth threshold Th4 for performing abnormality determination from the temperature TE of the smoothing capacitor 12. The fourth threshold value Th4 is set to an optimal value through experiments or the like. Since specific numerical values vary depending on the specifications of the smoothing capacitor 12, the operating time of the elevator, and the like, they are omitted here.

  The abnormality determination unit 24 determines the abnormality of the smoothing capacitor 12 using the three conditions of the threshold value Th1, the threshold value Th2, and the threshold value Th4. That is, in a state where the value obtained by multiplying the current value Ic or the voltage value Vc by the coefficient of the change rate Pc exceeds the first threshold Th1 and the number of charge / discharge times Nc exceeds the second threshold Th2, the temperature TE Exceeds the threshold Th4, the abnormality determination unit 24 determines that the smoothing capacitor 12 is in an abnormal state due to deterioration of the smoothing capacitor 12.

  In addition, the threshold value Th1 of the current value Ic and the threshold value Th2 of the voltage value Vc are reset according to the determination result of the threshold value Th4 of the temperature TE (for example, when the temperature TE exceeds the threshold value Th4, the threshold values Th1 and Th2 are increased). The abnormality determination of the smoothing capacitor 12 may be performed based on the threshold value Th1 and the threshold value Th2 after the resetting.

  As described above, according to the third embodiment, the abnormality of the smoothing capacitor 12 is more accurately determined by performing the abnormality determination in consideration of the temperature in addition to the rate of change of charge / discharge current / voltage and the number of times of charge / discharge. It becomes possible to detect. As a result, the smoothing capacitor 12 can be used until the end of its life, and can be reported and dealt with before the element is damaged due to deterioration.

  Note that the third embodiment may be configured in combination with the second embodiment.

(Fourth embodiment)
Next, a fourth embodiment will be described.

  In the fourth embodiment, in addition to the configuration of the first embodiment, a ripple voltage that is one of the characteristics of the smoothing capacitor is detected, and an abnormality is determined in consideration of the detected ripple voltage. It is.

  FIG. 10 is a diagram illustrating a configuration of an elevator control device according to the fourth embodiment. In addition, the same code | symbol is attached | subjected to the same part as FIG. 1 in the said 1st Embodiment, and the description is abbreviate | omitted.

  The elevator control device 20 according to the fourth embodiment includes a current voltage detection unit 21, a change rate detection unit 22, a chargeable / discharge number detection unit 23, an abnormality determination unit 24, a notification unit 25, an operation control unit 26, and an inverter drive. In addition to the unit 27, a ripple voltage detection unit 43 is provided. The ripple voltage detector 43 detects the ripple electricity RP included in the terminal voltage of the smoothing capacitor 12.

  FIG. 11 is a diagram showing ripple voltage characteristics of the smoothing capacitor 12.

  The smoothing capacitor 12 is connected between the DC buses for the purpose of absorbing the ripple voltage included in the DC that has been full-wave rectified by the converter device 11. However, the ripple voltage is not completely absorbed and is superimposed on the DC terminal voltage of the smoothing capacitor 12. As the smoothing capacitor 12 deteriorates, the ability to absorb the ripple voltage RP shown in FIG. 11 decreases, and the ripple voltage RP increases. Therefore, the deterioration state of the smoothing capacitor 12 can be determined by detecting the ripple voltage RP.

  In the present embodiment, the maximum value of the terminal voltage V of the smoothing capacitor 12 minus the minimum value of the terminal voltage V is used as the ripple voltage RP. The amount of change in the duty ratio (B / A) indicating the ratio of the voltage rise period B to A may be the ripple voltage RP. That is, when the smoothing capacitor 12 is deteriorated, the absorption capacity is reduced and the voltage is increased in a short time, so that the duty ratio (B / A) is changed.

  In such a configuration, the charging / discharging current value Ic, voltage value Vc, and charging / discharging frequency Nc of the smoothing capacitor 12 are detected at a predetermined measurement timing (when the elevator is started / stopped). Furthermore, in this embodiment, the ripple voltage RP of the smoothing capacitor 12 is detected by the ripple voltage detector 43 provided in the elevator control device 20.

  The abnormality determination unit 24 determines abnormality of the smoothing capacitor 12 based on these detection values. Specifically, the abnormality determination unit 24 compares the value obtained by multiplying the current value Ic or voltage value Vc of the smoothing capacitor 12 by the coefficient of the rate of change Pc from the initial value and a first threshold value Th1 set in advance. The charging / discharging frequency Nc of the capacitor 12 is compared with a preset second threshold Th2.

  Further, the abnormality determination unit 24 has a fifth threshold Th5 for performing abnormality determination from the ripple voltage RP of the smoothing capacitor 12. The fifth threshold Th5 is set to an optimal value through experiments or the like. Since specific numerical values vary depending on the specifications of the smoothing capacitor 12, the operating time of the elevator, and the like, they are omitted here.

  The abnormality determination unit 24 determines the abnormality of the smoothing capacitor 12 using the three conditions of the threshold value Th1, the threshold value Th2, and the threshold value Th5. That is, in the state where the value obtained by multiplying the current value Ic or the voltage value Vc by the coefficient of the change rate Pc exceeds the first threshold Th1 and the charge / discharge count Nc exceeds the second threshold Th2, the ripple voltage is further increased. When RP exceeds the threshold Th5, the abnormality determination unit 24 determines that the smoothing capacitor 12 is in an abnormal state due to deterioration of the smoothing capacitor 12.

  Note that the threshold value Th1 of the current value Ic and the threshold value Th2 of the voltage value Vc are reset according to the determination result of the threshold value Th5 of the ripple voltage RP (for example, when the ripple voltage RP exceeds the threshold value Th5, the threshold values Th1 and Th2 are increased). ), The smoothing capacitor 12 may be determined to be abnormal based on the reset threshold Th1 and threshold Th2.

  As described above, according to the fourth embodiment, the abnormality determination is performed in consideration of the ripple voltage in addition to the charging / discharging current / voltage change rate and the number of charging / discharging, thereby more accurately determining the abnormality of the smoothing capacitor 12. Can be detected. As a result, the smoothing capacitor 12 can be used until the end of its life, and can be reported and dealt with before the element is damaged due to deterioration.

  The fourth embodiment may be configured in combination with at least one of the second and third embodiments.

(Fifth embodiment)
Next, a fifth embodiment will be described.

  In the fifth embodiment, in addition to the configuration of the first embodiment, an inrush current that is one of the characteristics of the smoothing capacitor is detected, and an abnormality determination is performed in consideration of the detected inrush current. It is.

  FIG. 12 is a diagram illustrating a configuration of an elevator control apparatus according to the fifth embodiment. In addition, the same code | symbol is attached | subjected to the same part as FIG. 1 in the said 1st Embodiment, and the description is abbreviate | omitted.

  The elevator control device 20 according to the fifth embodiment includes a current voltage detection unit 21, a change rate detection unit 22, a chargeable / discharge number detection unit 23, an abnormality determination unit 24, a notification unit 25, an operation control unit 26, and an inverter drive. In addition to the unit 27, an inrush current detection unit 44 is provided. The inrush current detection unit 44 detects an inrush current Ip flowing into the smoothing capacitor 12 at the start of power supply from the commercial power source 1.

  FIG. 13 is a diagram showing current characteristics of the smoothing capacitor 12 at the start of power supply.

  Prior to the start of power supply, no charge is accumulated in the smoothing capacitor 12, so the equivalent impedance is very small. In this state, when power supply is started and a DC voltage is applied to the smoothing capacitor 12, a current starts to flow through the smoothing capacitor 12. At this time (immediately after voltage application), a large current larger than the steady current flows into the smoothing capacitor 12 as the inrush current Ip. The inrush current Ip greatly affects the equivalent impedance of the smoothing capacitor 12 and causes deterioration. Therefore, the deterioration state of the smoothing capacitor 12 can be determined by detecting the inrush current Ip.

  In such a configuration, the charging / discharging current value Ic, voltage value Vc, and charging / discharging frequency Nc of the smoothing capacitor 12 are detected at a predetermined measurement timing (when the elevator is started / stopped). Furthermore, in the present embodiment, the inrush current Ip of the smoothing capacitor 12 is detected by the inrush current detection unit 44 provided in the elevator control device 20 at the start of power supply.

  The abnormality determination unit 24 determines abnormality of the smoothing capacitor 12 based on these detection values. Specifically, the abnormality determination unit 24 compares the value obtained by multiplying the current value Ic or voltage value Vc of the smoothing capacitor 12 by the coefficient of the rate of change Pc from the initial value and a first threshold value Th1 set in advance. The charging / discharging frequency Nc of the capacitor 12 is compared with a preset second threshold Th2.

  The abnormality determination unit 24 has a sixth threshold Th6 for determining abnormality from the inrush current Ip of the smoothing capacitor 12. The sixth threshold Th6 is set to an optimal value through experiments or the like. Since specific numerical values vary depending on the specifications of the smoothing capacitor 12, the operating time of the elevator, and the like, they are omitted here.

  The abnormality determination unit 24 performs abnormality determination of the smoothing capacitor 12 using three conditions of the threshold value Th1, the threshold value Th2, and the threshold value Th6. That is, in the state where the value obtained by multiplying the current value Ic or the voltage value Vc by the coefficient of the change rate Pc exceeds the first threshold Th1 and the charge / discharge count Nc exceeds the second threshold Th2, the inrush current is further increased. When Ip exceeds the threshold Th6, the abnormality determining unit 24 determines that the smoothing capacitor 12 is in an abnormal state due to deterioration of the smoothing capacitor 12.

  Note that the threshold value Th1 of the current value Ic and the threshold value Th2 of the voltage value Vc are reset based on the determination result of the threshold value Th6 of the inrush current Ip (for example, when the inrush current Ip exceeds the threshold value Th6, the threshold values Th1 and Th2 are set). The smoothing capacitor 12 may be determined to be abnormal based on the threshold value Th1 and the threshold value Th2 after the resetting.

  As described above, according to the fifth embodiment, the abnormality of the smoothing capacitor 12 is more accurately determined by performing the abnormality determination in consideration of the inrush current in addition to the charge / discharge current / voltage change rate and the number of charge / discharge. Can be detected. As a result, the smoothing capacitor 12 can be used until the end of its life, and can be reported and dealt with before the element is damaged due to deterioration.

  The fifth embodiment may be configured in combination with at least one of the second to fourth embodiments.

(Sixth embodiment)
Next, a sixth embodiment will be described.

  In the sixth embodiment, in addition to the configuration of the first embodiment, a leakage current which is one of the characteristics of the smoothing capacitor is detected, and an abnormality determination is performed in consideration of the detected leakage current. It is.

  FIG. 14 is a diagram showing a configuration of an elevator control apparatus according to the sixth embodiment. In addition, the same code | symbol is attached | subjected to the same part as FIG. 1 in the said 1st Embodiment, and the description is abbreviate | omitted.

  The elevator control device 20 according to the sixth embodiment includes a current voltage detection unit 21, a change rate detection unit 22, a chargeable / discharge number detection unit 23, an abnormality determination unit 24, a notification unit 25, an operation control unit 26, and an inverter drive. In addition to the unit 27, a leakage current detection unit 45 is provided. The smoothing capacitor 12 is not a perfect insulator, and when a voltage is actually applied, a minute leakage current Ir is generated. The leakage current detector 45 detects the leakage current Ir of the smoothing capacitor 12.

  FIG. 15 is a diagram showing a change with time of the current flowing through the smoothing capacitor 12.

  When power supply is started and a DC voltage is applied to the smoothing capacitor 12, a current starts to flow through the smoothing capacitor 12. Immediately after the voltage is applied, the current has a peak, but as the electric charge accumulates in the smoothing capacitor 12, the current decreases exponentially. Here, when a certain time tr elapses from the start of voltage application, a leakage current Ir is generated. As the smoothing capacitor 12 deteriorates, the impedance changes and the value of the leakage current Ir increases. Therefore, the deterioration state of the smoothing capacitor 12 can be determined by detecting the leakage current Ir.

  In such a configuration, the charging / discharging current value Ic, voltage value Vc, and charging / discharging frequency Nc of the smoothing capacitor 12 are detected at a predetermined measurement timing (when the elevator is started / stopped). Furthermore, in the present embodiment, the leakage current Ir of the smoothing capacitor 12 is detected by the leakage current detector 45 provided in the elevator control device 20.

  The abnormality determination unit 24 determines abnormality of the smoothing capacitor 12 based on these detection values. Specifically, the abnormality determination unit 24 compares the value obtained by multiplying the current value Ic or voltage value Vc of the smoothing capacitor 12 by the coefficient of the rate of change Pc from the initial value and a first threshold value Th1 set in advance. The charging / discharging frequency Nc of the capacitor 12 is compared with a preset second threshold Th2.

  Further, the abnormality determination unit 24 has a seventh threshold Th7 for performing abnormality determination from the leakage current Ir of the smoothing capacitor 12. The seventh threshold Th7 is set to an optimum value by experiments or the like. Since specific numerical values vary depending on the specifications of the smoothing capacitor 12, the operating time of the elevator, and the like, they are omitted here.

  The abnormality determination unit 24 performs abnormality determination of the smoothing capacitor 12 using three conditions of the threshold Th1, the threshold Th2, and the threshold Th7. That is, in a state where the value obtained by multiplying the current value Ic or the voltage value Vc by the coefficient of the change rate Pc exceeds the first threshold Th1, and the charge / discharge count Nc exceeds the second threshold Th2, When Ir exceeds the threshold Th7, the abnormality determination unit 24 determines that the smoothing capacitor 12 is in an abnormal state due to deterioration of the smoothing capacitor 12.

  Based on the determination result of the threshold value Th7 of the leakage current Ir, the threshold value Th1 of the current value Ic and the threshold value Th2 of the voltage value Vc are reset (for example, the threshold values Th1 and Th2 are set when the leakage current Ir exceeds the threshold value Th7). The smoothing capacitor 12 may be determined to be abnormal based on the threshold value Th1 and the threshold value Th2 after the resetting.

  As described above, according to the sixth embodiment, the abnormality determination is performed in consideration of the leakage current in addition to the charging / discharging current / voltage change rate and the number of charging / discharging, thereby more accurately determining the abnormality of the smoothing capacitor 12. Can be detected. As a result, the smoothing capacitor 12 can be used until the end of its life, and can be reported and dealt with before the element is damaged due to deterioration.

  The sixth embodiment may be configured in combination with at least one of the second to fifth embodiments.

(Seventh embodiment)
Next, a seventh embodiment will be described.

  In the seventh embodiment, in addition to the configuration of the first embodiment, a charge / discharge time constant that is one of the characteristics of the smoothing capacitor is detected, and the detected charge / discharge time constant (charge / discharge time constant or discharge time constant) is detected. (Constant) is taken into account for determining abnormality.

  FIG. 16 is a diagram illustrating a configuration of an elevator control device according to the seventh embodiment. In addition, the same code | symbol is attached | subjected to the same part as FIG. 1 in the said 1st Embodiment, and the description is abbreviate | omitted.

  The elevator control device 20 according to the seventh embodiment includes a current voltage detection unit 21, a change rate detection unit 22, a chargeable / discharge number detection unit 23, an abnormality determination unit 24, a notification unit 25, an operation control unit 26, and an inverter drive. In addition to the unit 27, a time constant detection unit 46 is provided. The time constant detection unit 46 detects a charging time constant TC that indicates a change over time of a voltage rise when the smoothing capacitor 12 is charged. In addition, the time constant detection unit 46 detects a discharge time constant TD indicating a time change of a voltage drop at the time of discharging the smoothing capacitor 12.

  Here, the charge / discharge characteristics of the smoothing capacitor 12 will be described with reference to FIGS. 17 and 18. FIG. 17 is a diagram illustrating the charging characteristics of the smoothing capacitor 12, and FIG. 18 is a diagram illustrating the discharging characteristics of the smoothing capacitor 12.

  As shown in FIG. 17, at the time of charging, the voltage (terminal voltage) Vc of the smoothing capacitor 12 increases according to a constant increase rate from time t = 0 with the start of power supply from the commercial power supply 1, and is determined in advance. Reaches the voltage value V0. When the constituent material of the smoothing capacitor 12 is further deteriorated and the capacity is reduced, the charging time constant TC is increased because V0 is reached in a short time from the start of charging as indicated by a dotted line in the figure. That is, the inclination angle θc of the charging time constant TC representing the change in the charging characteristic voltage is larger than that in the normal state.

  As shown in FIG. 18, at the time of discharging, the voltage (terminal voltage) Vc of the smoothing capacitor 12 decreases according to a constant decrease rate from time t = 0 to 0 volts. When the smoothing capacitor 12 is deteriorated and the capacity is reduced, the discharge time constant TD decreases because the voltage reaches 0 volts in a short time from the start of discharge as indicated by a dotted line in the figure. That is, the inclination angle θd of the discharge time constant TD representing the voltage change of the discharge characteristics is larger than that in the normal state.

  As described above, the charge / discharge characteristics change depending on the deterioration state of the smoothing capacitor 12, so that the life of the smoothing capacitor 12 can be determined by detecting the charge time constant TC or the discharge time constant TD.

  In such a configuration, the charging / discharging current value Ic, voltage value Vc, and charging / discharging frequency Nc of the smoothing capacitor 12 are detected at a predetermined measurement timing (when the elevator is started / stopped). Furthermore, in the present embodiment, the time constant detection unit 46 provided in the elevator control device 20 detects the charging time constant TC or the discharging time constant TD of the smoothing capacitor 12.

  The abnormality determination unit 24 determines abnormality of the smoothing capacitor 12 based on these detection values. Specifically, the abnormality determination unit 24 compares the value obtained by multiplying the current value Ic or voltage value Vc of the smoothing capacitor 12 by the coefficient of the rate of change Pc from the initial value and a first threshold value Th1 set in advance. The charging / discharging frequency Nc of the capacitor 12 is compared with a preset second threshold Th2.

  Further, the abnormality determination unit 24 performs abnormality determination from the eighth threshold Th8 for performing abnormality determination from the inclination angle θc of the charging time constant Tc of the smoothing capacitor 12 and the inclination angle θd of the discharging time constant Td of the smoothing capacitor 12. It has a ninth threshold Th9 for performing. The eighth threshold value Th8 and the ninth threshold value Th9 are set to optimum values through experiments or the like. Since specific numerical values vary depending on the specifications of the smoothing capacitor 12, the operating time of the elevator, and the like, they are omitted here.

  The abnormality determination unit 24 determines abnormality of the smoothing capacitor 12 using three conditions of threshold value Th1, threshold value Th2, threshold value Th8 / threshold value Th9 (either Th8 or Th9 may be used). That is, in the state where the value obtained by multiplying the current value Ic or the voltage value Vc by the coefficient of the change rate Pc exceeds the first threshold Th1 and the charge / discharge count Nc exceeds the second threshold Th2, When the inclination angle θc of the constant Tc is larger than the threshold value Th8, the abnormality determination unit 24 determines that there is an abnormal state due to the deterioration of the smoothing capacitor 12. Alternatively, when the inclination angle θd of the discharge time constant Td is larger than the threshold Th9, the abnormality determining unit 24 determines that the smoothing capacitor 12 is in an abnormal state due to deterioration.

  The threshold value Th1 of the current value Ic and the threshold value Th2 of the voltage value Vc are reset based on the determination result of the threshold value Th8 of the inclination angle θc or the threshold value Th9 of the inclination angle θd (for example, the inclination angle θc / θd is the threshold value Th8 / If the threshold value Th1 is larger than Th9, the threshold Th1 and Th2 are increased), and the smoothing capacitor 12 may be determined to be abnormal based on the reset threshold Th1 and threshold Th2.

  As described above, according to the seventh embodiment, the abnormality of the smoothing capacitor 12 can be further improved by performing the abnormality determination in consideration of the charge / discharge characteristics in addition to the charge / discharge current / voltage change rate and the charge / discharge frequency. It becomes possible to detect accurately. As a result, the smoothing capacitor 12 can be used until the end of its life, and can be reported and dealt with before the element is damaged due to deterioration.

  The seventh embodiment may be configured in combination with at least one of the second to sixth embodiments.

  According to at least one of the embodiments described above, the smoothing capacitor is used until the appropriate life, and the work load of the maintenance staff is reduced. It is possible to provide an elevator control device that can be used.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Commercial power source, 2 ... Hoisting machine, 3 ... Rope, 4 ... Car, 5 ... Counter weight, 10 ... Drive apparatus, 11 ... Converter apparatus, 12, 12a, 12b ... Smoothing capacitor, 13 ... Inverter apparatus, 14 DESCRIPTION OF SYMBOLS ... Charge circuit, 15 ... Discharge circuit, 20 ... Elevator control apparatus, 21 ... Current voltage detection part, 22 ... Change rate detection part, 23 ... Charge / discharge frequency detection part, 24 ... Abnormality determination part, 25 ... Notification part, 26 ... Operation control unit, 27 ... Inverter drive unit, 30 ... Element, 31 ... Anode foil, 32 ... Electrolytic paper, 33 ... Cathode foil, 34 ... Electrolytic paper, 35,36 ... Electrode terminal, 37 ... Aluminum case, 38 ... Sealing 41, voltage sharing rate detection unit, 42 ... temperature detection unit, 43 ... ripple voltage detection unit, 44 ... inrush current detection unit, 45 ... leakage current detection unit, 46 ... time constant detection unit.

In this elevator control device, a first detection means for detecting a current value or a voltage value of the smoothing capacitor at the time of starting or stopping of the elevator, and the smoothing capacitor is repeatedly charged and discharged through the first detection means . Second detection means for detecting the rate of change in current value or voltage value, third detection means for detecting the number of times the smoothing capacitor has been charged, and current obtained by the first to third detection means. Abnormality determining means for determining abnormality of the smoothing capacitor based on the rate of change of the value or voltage value and the number of charge / discharge, and when the smoothing capacitor is determined to be in an abnormal state by the abnormality determining means And a reporting means for issuing a report.

Further, a DC circuit between the converter device 11 and the smoothing capacitor 12 is provided with a charging circuit 14 for charging the smoothing capacitor 12. A DC circuit between the smoothing capacitor 12 and the inverter device 13 is provided with a discharge circuit 15 for discharging the smoothing capacitor 12.

The inverter drive unit 27 drives the inverter device 13 in accordance with a drive command from the operation control unit 26. Specifically, inverter drive unit 27, the semi-conductor switching elements in the inverter device 13 to ON / OFF control in accordance with a drive command from the operation control unit 26, the purpose of the car 4 at a specified speed by driving the hoisting machine 2 Move to the floor.

As the smoothing capacitor 12 deteriorates and the capacity for storing charges decreases, the rise and fall of the charge current and discharge current become steep, and the number of charge / discharge cycles Nc per unit time also increases. In this case, repeated charging and discharging times Nc current Ic from a low state as shown in FIG. 5 (c), the smoothing capacitor 12 when the state current value Ic is high as shown in FIG. 5 (b) The load is highest and the risk of breakage increases.

Claims (16)

Converter device for converting AC voltage supplied from commercial power source to DC, smoothing capacitor for smoothing DC voltage converted by this converter device by charge / discharge operation, and DC voltage smoothed by this smoothing capacitor In an elevator control device that controls a drive device including an inverter device that converts AC into AC necessary for driving a hoisting machine,
First detecting means for detecting a current value or a voltage value of the smoothing capacitor when the elevator is started or stopped;
Second detection means for detecting the rate of change of the current value or voltage value detected by the first detection means;
Third detecting means for detecting the number of times of charging / discharging of the smoothing capacitor;
An abnormality determining means for determining an abnormality of the smoothing capacitor based on the rate of change of the current value or voltage value obtained by the first to third detecting means and the number of times of charging and discharging;
An elevator control device comprising: an alarming unit for notifying the smoothing capacitor when the abnormality determining unit determines that the smoothing capacitor is in an abnormal state. The abnormality determination means is
A value obtained by multiplying the current value or voltage of the smoothing capacitor by a coefficient of change exceeds a preset first threshold value, and the number of charge / discharge cycles of the smoothing capacitor exceeds a preset second threshold value. The elevator control apparatus according to claim 1, wherein the smoothing capacitor is determined to be in an abnormal state. The smoothing capacitor includes at least two capacitors connected in series between the DC buses, and further includes fourth detection means for detecting a voltage sharing ratio between these capacitors,
The abnormality determination means is
2. The elevator control apparatus according to claim 1, wherein an abnormality of the smoothing capacitor is determined in consideration of a voltage sharing ratio detected by the fourth detection means. The smoothing capacitor includes at least two capacitors connected in series between the DC buses, and further includes fourth detection means for detecting a voltage sharing ratio between these capacitors,
The abnormality determination means is
A third threshold value for determining an abnormality from the voltage sharing ratio detected by the fourth detection means; and a determination result of the first and second threshold values and a determination result of the third threshold value. 3. The elevator control apparatus according to claim 2, wherein abnormality of the smoothing capacitor is determined based on the determination. A fifth detecting means for detecting the temperature of the smoothing capacitor;
The abnormality determination means is
2. The elevator control apparatus according to claim 1, wherein an abnormality of the smoothing capacitor is determined in consideration of the temperature detected by the fifth detection means. A fifth detecting means for detecting the temperature of the smoothing capacitor;
The abnormality determination means is
A fourth threshold value for performing abnormality determination from the temperature detected by the fifth detection means, and based on the determination result of the first and second threshold values and the determination result of the fourth threshold value; The elevator control apparatus according to claim 2, wherein an abnormality of the smoothing capacitor is determined. Further comprising sixth detecting means for detecting the ripple voltage of the smoothing capacitor;
The abnormality determination means is
2. The elevator control apparatus according to claim 1, wherein an abnormality of the smoothing capacitor is determined in consideration of a ripple voltage detected by the sixth detection means. Further comprising sixth detecting means for detecting the ripple voltage of the smoothing capacitor;
The abnormality determination means is
A fifth threshold value for performing abnormality determination from the ripple voltage detected by the sixth detection means, and based on the determination result of the first and second threshold values and the determination result of the fifth threshold value; The elevator control apparatus according to claim 2, wherein abnormality of the smoothing capacitor is determined. A seventh detecting means for detecting an inrush current of the smoothing capacitor;
The abnormality determination means is
The elevator control apparatus according to claim 1, wherein an abnormality of the smoothing capacitor is determined in consideration of an inrush current detected by the seventh detection means. A seventh detecting means for detecting an inrush current of the smoothing capacitor;
The abnormality determination means is
A sixth threshold value for determining abnormality from the inrush current detected by the seventh detection means; and based on the determination result of the first and second threshold values and the determination result of the sixth threshold value The elevator control apparatus according to claim 2, wherein abnormality of the smoothing capacitor is determined. Further comprising an eighth detecting means for detecting a leakage current of the smoothing capacitor;
The abnormality determination means is
2. The elevator control apparatus according to claim 1, wherein an abnormality of the smoothing capacitor is determined in consideration of a leakage current detected by the eighth detection means. Further comprising an eighth detecting means for detecting a leakage current of the smoothing capacitor;
The abnormality determination means is
A seventh threshold value for performing abnormality determination from the leakage current detected by the eighth detection means; and based on the determination result of the first and second threshold values and the determination result of the seventh threshold value The elevator control apparatus according to claim 2, wherein abnormality of the smoothing capacitor is determined. A ninth detecting means for detecting a charging time constant indicating a time change of the voltage rise of the smoothing capacitor at the time of starting or stopping of the elevator;
The abnormality determination means is
The elevator control apparatus according to claim 1, wherein an abnormality of the smoothing capacitor is determined in consideration of a slope of a charging time constant detected by the ninth detecting means. A ninth detecting means for detecting a charging time constant indicating a time change of the voltage rise of the smoothing capacitor at the time of starting or stopping of the elevator;
The abnormality determination means is
It has an eighth threshold value for performing abnormality determination from the charging time constant detected by the ninth detection means, and includes a determination result of the first and second threshold values and a determination result of the eighth threshold value. 3. The elevator control apparatus according to claim 2, wherein abnormality of the smoothing capacitor is determined based on the determination. A tenth detecting means for detecting a discharge time constant indicating a time change of the voltage drop of the smoothing capacitor at the time of starting or stopping the elevator;
The abnormality determination means is
2. The elevator control apparatus according to claim 1, wherein an abnormality of the smoothing capacitor is determined in consideration of a slope of a discharge time constant detected by the tenth detection means. A tenth detecting means for detecting a discharge time constant indicating a time change of the voltage drop of the smoothing capacitor at the time of starting or stopping the elevator;
The abnormality determination means is
A ninth threshold value for determining abnormality from the discharge time constant detected by the tenth detection means; and a determination result of the first and second threshold values and a determination result of the ninth threshold value. 3. The elevator control apparatus according to claim 2, wherein abnormality of the smoothing capacitor is determined based on the determination.

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