JP2010006568A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To monitor the service life of a smoothing capacitor assembled in a power conversion part that drives a motor of an elevator and performs replacement at an optimal timing. <P>SOLUTION: Characteristics, such as a charging time constant, discharging time constant, ripple voltage, voltage sharing rate, surge voltage, inrush voltage, and temperatures of the smoothing capacitor 7 which is a monitoring object of the service life, are periodically measured, and countermeasures to be performed are sequentially changed from alarm, load control operation, to operation stop accompanying progress of deterioration of the characteristics of measured characteristic values. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an elevator control device that controls the operation of an elevator, and more particularly to an elevator control device that monitors the life of a smoothing capacitor incorporated in a power conversion unit that supplies electric power to a motor (motor) that moves an elevator car up and down. .

  FIG. 27 is a schematic configuration diagram of an elevator control apparatus that employs a system in which electric power is supplied to an electric motor (motor) that moves an elevator car built in a building up and down via a power conversion unit.

  Three-phase alternating current supplied from the alternating current power source 1 via the power line 2 and the power switch 3 is input to the rectifier 5 of the power conversion unit 4. The rectifier 5 configured by bridge-connecting six diodes performs full-wave rectification of the input three-phase alternating current to direct current and outputs the direct current to the direct current lines 6a and 6b. The direct current output to the direct current lines 6a and 6b is input to the inverter 8 after the ripple component is absorbed by the smoothing capacitor 7 connected between the direct current lines 6a and 6b.

  In this inverter 8, six semiconductor switching elements 9 are bridge-connected. Then, each switching element 9 of the inverter 8 is turned on / off by a PWM (pulse width modulation) signal output from the inverter drive circuit 10 to convert the input direct current into a three-phase alternating current having an arbitrary frequency and voltage. The electric power is converted and supplied to an AC electric motor 13 incorporated in the hoisting machine 12 through the power line 11.

  A main rope 15 is hung on a sheave 14 attached to the shaft of the electric motor 13, and a car 18 and a counterweight 19 are suspended from the main rope 15 via other sheaves 16 and 17. . Therefore, the car 18 can be moved up and down by rotating the electric motor 13.

  In addition, between the DC lines 6a and 6b, when the electric motor 18 is in a regenerative operation, a regenerative resistor 20 and a switching element (Q for consuming DC regenerative power output to the DC lines 6a and 6b of the inverter 8). A series circuit with (element) 21 is connected. The switching element (Q element) 21 is ON / OFF controlled by the inverter drive circuit 10 during the regenerative operation.

  A car call registration device 22 is installed in the car 18, and a hall call registration device 23 is installed in each elevator hall on each floor of the building. Each “call” registered by the user's button operation in the car call registration device 22 and each hall call registration device 23 is input to an elevator operation unit 24 composed of a computer.

  A normal operation unit 25 and a call assignment unit 26 are provided in the elevator operation unit 24. The call assignment unit 26 selects a car 18 that responds to each input “call”, assigns the call to the car 18, and sends the call to the normal operation unit 25. The normal operation section 25 instructs the inverter drive circuit 10 to move the car 18 to the “floor” designated by “call”. The inverter drive circuit 10 creates a TWM signal to be applied to each switching element 9 of the inverter 8 based on the current position of the car 18, the destination floor, etc., and sends the TWM signal to each switching element 9. Move to the destination floor.

An elevator in which such a power conversion unit 4 is incorporated in the power supply circuit of the electric motor 13 has already been put into practical use (see Patent Document 1).
JP 2003-299250 A

  However, the elevator control apparatus shown in FIG. 27 still has the following problems to be improved.

  That is, in the smoothing capacitor 7 that constitutes a part of the power conversion unit 4, performance deterioration progresses as charging and discharging are repeated. Therefore, the smoothing capacitor 7 also needs to be replaced periodically. The replacement of the smoothing capacitor 7 is performed in the number of years determined by the smoothing capacitor incorporated in an elevator that has a long operation time and is frequently used.

  For this reason, the smoothing capacitor 7 incorporated in an elevator that is less frequently used is replaced before the actual product life is reached. Although voltage measurement is performed at important points such as the input unit of the rectifier 5 and the output unit of the inverter 8 in the power conversion unit 4 but is not continuously measured, for example, during charging / discharging of the smoothing capacitor 7 or If an abnormality occurs when monitoring is not performed, the smoothing capacitor 7 is damaged, the power conversion unit 4 is stopped, the electric motor 13 is stopped, and the elevator car 18 is located between the floors. There is a concern that users will be locked in place and trapped in the car.

  Further, if the replacement time of the smoothing capacitor 7 is set short in order to prevent such an accident from occurring, the parts replacement work increases, and the elevator maintenance management cost increases.

  The present invention has been made in view of such circumstances, and by measuring various characteristics of a smoothing capacitor connected between DC lines, an alarm that the life of the smoothing capacitor at the time of measurement is approaching. Etc., the life and abnormalities of the smoothing capacitor can be properly monitored, and the smoothing capacitor can be replaced before the smoothing capacitor is damaged. It is an object of the present invention to provide an elevator control device that can be used to the end of its lifetime and can save the maintenance cost of the elevator.

  The present invention comprises an electric motor for moving an elevator car to each floor of a building, and alternating current supplied from an alternating current power source is converted into direct current by a rectifier, and the direct current is smoothed by a smoothing capacitor, and then a switching element is bridge-connected. A power converter that converts the alternating current into an inverter and supplies it to the motor; and an inverter drive circuit that controls conduction of each switching element of the inverter of the power converter and controls the frequency and power value of the alternating current supplied to the motor. The present invention is applied to an elevator control device having an elevator operation unit that sends a movement command for moving a car to a floor designated by the call operation in response to a call operation on each floor and in the car.

  In order to solve the above problems, in the elevator control device of the present invention, the capacitor characteristic measuring means for periodically measuring the characteristic of the smoothing capacitor, and the characteristic value of the smoothing capacitor measured by the capacitor characteristic measuring means Is determined in advance, the first characteristic determining means for determining whether or not the smoothing capacitor has reached the replacement reference value indicating that the life of the smoothing capacitor has approached, and the first characteristic determining means determines that the characteristic value is the replacement reference value. If it is determined that the value has reached, an alarm output means for outputting an alarm for approaching the life of the smoothing capacitor is provided.

  In the elevator control apparatus configured as described above, the characteristics of the smoothing capacitor incorporated in the power converter are periodically measured. Generally, since there is a correlation between the characteristic deterioration and the remaining life, when the measured characteristic value reaches the replacement reference value, an alarm indicating that the smoothing capacitor is near the life is output.

  In another aspect of the present invention, the characteristic value of the capacitor measured by the capacitor characteristic measuring means reaches a load limit reference value closer to the life of the smoothing capacitor than the replacement reference value. A second characteristic determining means for determining whether the characteristic value has reached the load limit reference value by the second characteristic determining means, and instructing the elevator operating unit to perform a load limiting operation. Load limiting operation means.

  In the elevator control device configured as described above, when the measured characteristic value reaches the load limit reference value, the load limit operation is performed.

  In another aspect of the invention, the characteristic value of the capacitor measured by the capacitor characteristic measuring means has reached a stop reference value that is closer to the life of the smoothing capacitor than the load limit reference value. A third characteristic determining means for determining whether the characteristic value has reached the stop reference value by the third characteristic determining means, an operation stop for instructing the elevator operating unit to stop the operation With means.

  In the elevator control device configured as described above, when the measured characteristic value reaches the stop reference value, the elevator is stopped. Thus, with the progress of characteristic deterioration, the countermeasures to be implemented, such as alarm, load limit operation, and operation stop, change.

  In another invention, the characteristic of the smoothing capacitor is a charging time constant, and the capacitor characteristic measuring means has a charging time constant indicating a time change of the terminal voltage rise of the smoothing capacitor at the start of supply of AC power to the power converter. It is a charge time constant measuring circuit to measure.

  Furthermore, the characteristic of the smoothing capacitor is a discharge time constant, and the capacitor characteristic measuring means measures the discharge time constant indicating the time change of the terminal voltage drop of the smoothing capacitor when the supply of AC power to the power converter is stopped. It is a measurement circuit.

  Further, the characteristic of the smoothing capacitor is the absorption characteristic of the ripple voltage, and the capacitor characteristic measuring means measures the terminal voltage of the smoothing capacitor to which the DC voltage including the ripple component output from the rectifier is applied, and from this terminal voltage. It is a ripple voltage measurement circuit that extracts a ripple voltage.

  Further, the characteristic of the smoothing capacitor is a change in the voltage sharing ratio between the capacitors when the smoothing capacitor is composed of a plurality of capacitors connected in series. The capacitor characteristic measuring means is a terminal voltage of each capacitor connected in series. Is a voltage sharing ratio measuring circuit that calculates a ratio between measured terminal voltages and outputs the voltage ratio as a voltage sharing ratio between capacitors.

  Furthermore, the characteristic of the smoothing capacitor is a surge voltage absorption characteristic, and the capacitor characteristic measuring means measures the terminal voltage of the smoothing capacitor and is caused by the switching operation of each switching element of the inverter included in the measured terminal voltage. This is a surge voltage measuring circuit that extracts and outputs a generated surge voltage.

  Furthermore, the characteristic of the smoothing capacitor is an inrush current characteristic, and the capacitor characteristic measuring means is an inrush current measuring circuit that measures an inrush current flowing into the smoothing capacitor at the start of supply of AC power to the power converter.

  Furthermore, the characteristic of the smoothing capacitor is temperature, and the capacitor characteristic measuring means is a temperature measurement circuit that measures the temperature of the smoothing capacitor.

  In the present invention, charging time constant, discharging time constant, ripple voltage absorption characteristics, voltage sharing ratio, surge voltage absorption characteristics, inrush current of a smoothing capacitor incorporated in a power converter that drives an electric motor that moves an elevator car up and down Measure the characteristics such as temperature periodically, and the countermeasures to be implemented, such as alarm, load limit operation, and shutdown, change as the characteristic deterioration of the measured characteristic value progresses.

  Therefore, the life and abnormalities of the smoothing capacitor can be properly monitored, and the smoothing capacitor can be replaced before the smoothing capacitor is damaged. Can be used and the maintenance cost of the elevator can be reduced.

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

(First embodiment)
FIG. 1 is a diagram showing a schematic configuration of an elevator control apparatus according to a first embodiment of the present invention. The same parts as those in the conventional elevator control apparatus shown in FIG.

  The three-phase alternating current supplied from the alternating current power source 1 via the power line 2 and the power switch 3 is input to the rectifier 5 of the power conversion unit 4 and is converted into direct current of full wave rectification by the rectifier 5 between the direct current lines 6a and 6b. The ripple component of the full-wave rectified waveform contained in the direct current is absorbed by the smoothing capacitor 7 connected to the input and then input to the inverter 8. By turning on / off each switching element 9 of the inverter 8 with a PWM (pulse width modulation) signal output from the inverter drive circuit 10, the direct current input to the inverter 8 is converted into a three-phase alternating current. To the electric motor 13 incorporated in the hoisting machine 12.

  A main rope 15 is hung on a sheave 14 attached to the shaft of the electric motor 13, and a car 18 and a counterweight 19 are suspended from the main rope 15 via other sheaves 16 and 17. . Therefore, the car 18 can be moved up and down by rotating the electric motor 13.

  A series circuit of a regenerative resistor 20 and a switching element (Q element) 21 is connected between the DC wires 6a and 6b. The switching element (Q element) 21 is ON / OFF controlled by the inverter drive circuit 10 during the regenerative operation.

  A car call registration device 22 is installed in the car 18, and a hall call registration device 23 is installed in each elevator hall on each floor of the building. Each “call” registered by the customer in the car call registration device 22 and each hall call registration device 23 is input to the elevator operation unit 30 formed of a computer.

  In the elevator operation unit 30, a call assignment unit 31, a normal operation unit 32, a load limit operation unit 33, and an operation stop unit 34 are provided. The call assigning unit 31 selects a car 18 that responds to each input “call”, assigns the call to the selected car 18, and sends it to the normal operation unit 32. The normal operation unit 32 instructs the inverter drive circuit 10 to move the car 18 to the “floor” designated by the call. The inverter drive circuit 10 creates a PWM signal to be applied to each switching element 9 of the inverter 8 based on the current position, destination floor, etc. of the car 18, and sends the PWM signal to each switching element 9. Move to the destination floor.

  The basic operation of the load limiting operation unit 33 is the same as that of the normal operation unit 32. However, when the car 18 is actually moved to the destination floor, the acceleration and floor at the start of movement are reduced for the purpose of reducing the load on the motor 13. The moving speed between the floor and the floor, the deceleration at the time of arrival at the destination floor, etc. are reduced, and the inverter driving circuit 10 is instructed to move to operate the elevator. The inverter drive circuit 10 drives the inverter 8 under the designated conditions.

  In addition, the load limiting operation unit 33 changes the allowable load of the car 18 to a small value, and if a user exceeding the allowable load that has been changed to the car 18 tries to get in, the warning buzzer sounds and the user exceeding the allowable load is heard. Prevents the motor 13 from getting in, thereby reducing the load on the motor 13. As a result, the load on the electric motor 13 is reduced, and the current flowing through the electric motor 13 is also reduced.

  When the operation stop instruction is input, the operation stop unit 34 stops the car 18 to the nearest floor.

  A charging circuit 35 is provided between the rectifier 5 of the DC line 6 a and the smoothing capacitor 7 to charge the smoothing capacitor 7 when the power is turned on by the power switch 3. The charging time constant circuit 36 measures the charging time constant TK indicating the time change of the terminal voltage rise of the smoothing capacitor 7 at the start of the supply of alternating current to the power conversion unit 4 via the charging circuit 35. The charging time constant circuit 36 sends the measured charging time constant TK to the first characteristic determining unit 37, the second characteristic determining unit 38, and the third characteristic determining unit 39.

FIG. 2 is a diagram illustrating the charging characteristics of the smoothing capacitor 7. The terminal voltage V of the smoothing capacitor 7 increases according to a constant rate of increase (charging time constant TK) from the time t = 0 when the power switch 3 is turned on, and becomes a DC voltage V _D output from the rectifier 5. For example, when deterioration of the constituent material of the smoothing capacitor 7 progresses and the capacity of the smoothing capacitor 7 decreases, the DC voltage V _D is reached in a short time from the start of charging, so the charging time constant TK increases. Therefore, the lifetime of the smoothing capacitor 7 can be determined by measuring the charging time constant TK.

The range of the charging time constant TK is divided into normal TK ₀ , replacement reference value TK ₁ , load limit reference value TK ₂ , and stop reference value TK ₃ . When the charging time constant TK measured by the charging time constant circuit 36 is equal to or greater than the replacement reference value (TK ₁ ) 40, the first characteristic determination unit 37 communicates an alarm for replacement timing of the smoothing capacitor 7 from the alarm output unit 43, for example. Send to an external monitoring center connected via a line. Further, a warning message for replacement time is displayed on a display unit (not shown). Then, regardless of the determination by the first characteristic determination unit 37, the normal operation unit 32 is activated to start a normal elevator operation.

When the charge time constant TK measured by the charge time constant circuit 36 becomes equal to or greater than the load limit reference value (TK ₂ ) 41, the second characteristic determination unit 38 activates the load limit operation unit 33. When the load limiting operation unit 33 is activated, the above-described operation for reducing the load on the electric motor 13 is performed.

The third characteristic determination unit 39 activates the operation stop unit 34 when the charge time constant TK measured by the charge time constant circuit 36 becomes equal to or greater than the stop reference value (TK ₃ ) 42. When the operation stop unit 34 is activated, the operation of the elevator is stopped as described above.

FIG. 3 is a flowchart showing the overall operation of the elevator control apparatus of the first embodiment configured as described above. When the power switch 3 is turned on in the elevator operation unit 30 (step S1-1), the charging time constant TK is measured by the charging time constant measuring circuit 36 (S1-2), and this charging time constant TK is exchanged. When it is less than the reference value TK ₁ (S1-3), the normal operation section 32 starts the normal operation of the elevator (S1-10). If the charging time constant TK replacement reference value TK ₁ or more, at alarm output unit 43, a warning onset report that lifetime of the smoothing capacitor 7 has reached the time to replace for example, to the monitoring center via the communication line (S1-4).

When the charging time constant TK is less than the load limit reference value TK ₂ (S1-5), normal operation of the elevator is started (S1-10). If the charging time constant TK load limit reference value TK ₂ or more (S1-5), at a load limiting operation unit 33, sets the operating conditions of the load limiting operation (S1-6). Further, the charging time constant TK if less than stop reference value TK ₃ (S1-7) starts the load limit operation (S1-11). If the charge time constant TK is above stop criterion value TK _3, After performing the protection operation of a mechanical fixing such as a basket 18 (S1-8), shutdown unit 34 stops the operation of the elevator (S1-9 ).

In the elevator control apparatus according to the first embodiment configured as described above, during charging, which is one of the characteristics of the smoothing capacitor 7 incorporated in the power conversion unit 4 that drives the electric motor 13 that moves the elevator car 18 up and down. The constant TK is measured periodically such as when the power switch 3 is turned on at the start of elevator operation every morning, and the measured charging time constant TK is the normal TK ₀ , replacement reference value TK ₁ , load limit reference value TK. _{2. As} the stop reference value TK ₃ and the characteristic deterioration progress in sequence, the warning measures, the load limit operation, and the operation stop are sequentially changed.

  Accordingly, the life and abnormality of the smoothing capacitor 7 can be properly monitored, and the smoothing capacitor 7 can be replaced before the smoothing capacitor 7 is damaged. The capacitor 7 can be used to the end of its lifetime, and the maintenance cost of the elevator can be reduced.

  FIG. 4 is a flowchart showing the overall operation of the elevator control device of a modification of the elevator control device of the first embodiment described above. In this modification, the third characteristic determination unit 39, the stop reference value 42, and the operation stop unit 34 in the elevator control device of the first embodiment of FIG. 1 are not provided.

In the flowchart of FIG. 4, when the power switch 3 is turned on in the elevator operation section 30 (S2-1), the charging time constant TK is measured by the charging time constant measuring circuit 36 (S2-2), and this charging is performed. When the time constant TK is less than the exchange reference value TK ₁ (S2-3), the normal operation unit 32 starts the normal operation of the elevator (S2-7). If the charging time constant TK replacement reference value TK ₁ or more, at alarm output unit 43, an alarm onset report that lifetime of the smoothing capacitor 7 has reached the time to replace for example, to the monitoring center via the communication line (S2-4).

When the charging time constant TK is less than the load limit reference value TK ₂ (S2-5), the normal operation of the elevator is started (S2-7). If the charging time constant TK load limit reference value TK ₂ or more (S2-5), at a load limiting operation unit 33 starts the load limit operation (S2-6).

  Even with the elevator control device according to the modified example in which the elevator control device according to the first embodiment is simplified, the basic operational effects of the present invention are sufficiently ensured.

(Second Embodiment)
FIG. 5 is a diagram showing a schematic configuration of the elevator control apparatus according to the second embodiment of the present invention. The same parts as those of the elevator control apparatus of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description of the overlapping parts is omitted.

In the elevator control device of the second embodiment, a switch and a current limiting resistor for discharging the electric charge accumulated in the smoothing capacitor 7 are incorporated between the DC lines 6a and 6b between the smoothing capacitor 7 and the inverter 8. The discharge circuit 45 is connected. The discharge time constant measurement circuit 46 closes the switch of the discharge circuit 45 in a state where the smoothing capacitor 7 is sufficiently charged with the direct current of the voltage V _D output from the rectifier 5, and charges accumulated in the smoothing capacitor 7. Is discharged by the discharge circuit 45. The discharge time constant measuring circuit 46 measures the voltage V between the terminals of the smoothing capacitor 7 from the time t = 0 when the switch is closed, and calculates the discharge time constant TH indicating the time change of the voltage drop of the initial terminal voltage V _D. taking measurement. The discharge time constant measurement circuit 46 sends the measured discharge time constant TH to the first characteristic determination unit 37, the second characteristic determination unit 38, and the third characteristic determination unit 39.

FIG. 6 is a diagram showing the discharge characteristics of the smoothing capacitor 7. The terminal voltage V of the smoothing capacitor 7 decreases in accordance with a constant decrease rate (discharge time constant TH) from the closing time t = 0 of the switch of the discharge circuit 45, and the initial DC voltage V _D output from the rectifier 5 is 0. Decrease to bolt.

  For example, when deterioration of the constituent material of the smoothing capacitor 7 progresses and the capacity of the smoothing capacitor 7 decreases, the discharge time constant TH increases because it reaches “0” v (volt) in a short time from the start of discharge. To do. Therefore, the life of the smoothing capacitor 7 can be determined by measuring the discharge time constant TH.

The range of the discharge time constant TH is divided into a normal value TH ₀ , a replacement reference value TH ₁ , a load limit reference value TH ₂ , and a stop reference value TH ₃ . When the discharge time constant TH measured by the discharge time constant circuit 46 becomes equal to or greater than the replacement reference value (TH ₁ ) 40, the first characteristic determination unit 37 outputs an alarm message about the replacement time of the smoothing capacitor 7 from the alarm output unit 43. To do. Then, regardless of the determination by the first characteristic determination unit 37, the normal operation unit 32 is activated to start a normal elevator operation.

When the discharge time constant TH measured by the discharge time constant measurement circuit 46 becomes equal to or greater than the load limit reference value (TK ₂ ) 41, the second characteristic determination unit 38 activates the load limit operation unit 33. When the load limiting operation unit 33 is activated, the above-described operation for reducing the load on the electric motor 13 is performed.

The third characteristic determination unit 39 activates the operation stop unit 34 when the discharge time constant TH measured by the discharge time constant measurement circuit 46 becomes equal to or greater than the stop reference value (TK ₃ ) 42. When the operation stop unit 34 is activated, the operation of the elevator is stopped as described above.

  FIG. 7 is a flowchart showing the overall operation of the elevator control apparatus of the second embodiment configured as described above. In the state where the power switch 3 is turned on in the elevator operation unit 30 and the electric charge is sufficiently accumulated in the smoothing capacitor 7 by the direct current from the rectifier 5, the power switch 3 is cut off (step S3-1), and then When the switch of the discharge circuit 45 is turned on, the electric charge accumulated in the smoothing capacitor 7 starts discharging.

At the discharge time constant measuring circuit 46, the discharge time constant TH is measured (S3-2), when the discharge time constant TK is less than the replacement reference value TH ₁ (S3-3), the power at the elevator operation unit 30 The switch 3 is turned on (S3-10), and the normal operation section 32 starts the normal operation of the elevator (S3-11). If the discharge time constant TH is replaced reference value TH ₁ or more, at alarm output unit 43, an alarm onset report that lifetime of the smoothing capacitor 7 has reached the time to replace for example, to the monitoring center via the communication line (S3-4).

When the discharge time constant TH is less than the load limit reference value TH ₂ (S3-5), normal operation of the elevator is started (S3-10, S3-11). If the discharge time constant TH is the load limit reference value TH ₂ or more (S3-5), at a load limiting operation unit 33, it sets the operating conditions of the load limiting operation (S3-6). Further, when the discharge time constant TH is less than the stop reference value TH ₃ (S2-7), the load limiting operation is started (S3-12). When the discharge time constant TH is equal to or greater than the stop reference value TH ₃ , after carrying out a protective operation such as mechanical fixing of the car 18 (S3-8), the operation stop unit 34 stops the operation of the elevator (S3-9). ).

In the elevator control apparatus of the second embodiment configured as described above, at the time of discharge, which is one of the characteristics of the smoothing capacitor 7 incorporated in the power conversion unit 4 that drives the electric motor 13 that moves the elevator car 18 up and down. Constant TH is measured periodically such as when the power switch 3 is turned on at the start of elevator operation every morning, and the measured discharge time constant TH is the normal value TH ₀ , replacement reference value TH ₁ , load limit reference value As TH ₂ , stop reference value TH ₃ and characteristic deterioration progress, countermeasures to be implemented sequentially change, such as alarming, load limiting operation, and operation stop.

  Accordingly, as in the first embodiment described above, the life and abnormality of the smoothing capacitor 7 can be properly monitored, and the smoothing capacitor 7 can be replaced before the smoothing capacitor 7 is damaged. The smoothing capacitor 7 can be used to the end of its life with sufficient safety, and the maintenance cost of the elevator can be reduced.

  FIG. 8 is a flowchart showing the overall operation of the modified elevator control apparatus according to the elevator control apparatus of the second embodiment described above. In this modification, the third characteristic determination unit 39, the stop reference value 42, and the operation stop unit 34 in the elevator control device of the second embodiment in FIG. 5 are not provided.

  In FIG. 8, when the power switch 3 is turned on and the DC voltage from the rectifier 5 is sufficient to store the electric charge in the smoothing capacitor 7, the power switch 3 is shut off (S4-1), followed by the discharge. When the switch of the circuit 45 is turned on, the electric charge accumulated in the smoothing capacitor 7 starts discharging.

At the discharge time constant measuring circuit 46, the discharge time constant TH is measured (S4-2), when the discharge time constant TK is less than the replacement reference value TH ₁ (S4-3), the elevator operation unit 30, power supply The switch 3 is turned on (S4-7), and the normal operation section 32 starts the normal operation of the elevator (S4-8). When the discharge time constant TH is greater than or equal to the replacement reference value TH ₁ (S4-3), the alarm output unit 43 monitors that the life of the smoothing capacitor 7 has reached the replacement time, for example, via a communication line. An alarm is issued to the center (S4-4).

Then, when the discharge time constant TH is less than the load limit reference value TH ₂ (S4-5), it starts normal operation of the elevator (S4-7, S4-8). When the discharge time constant TH is greater than or equal to the load limit reference value TH ₂ (S4-5), the load limit operation unit 33 starts the load limit operation (S4-6).

  Even in a modified elevator control device obtained by simplifying the elevator control device according to the second embodiment, the basic functions and effects of the present invention are sufficiently secured.

(Third embodiment)
FIG. 9 is a diagram showing a schematic configuration of the elevator control apparatus according to the third embodiment of the present invention. The same parts as those in the elevator control apparatus according to the first embodiment of the present invention shown in FIG.

  In the elevator control apparatus of the third embodiment, the terminal voltage V of the smoothing capacitor 7 is measured in a state where the elevator is operated in a normal operation state, and the ripple voltage RP included in the terminal voltage V is obtained. A ripple voltage measurement circuit 47 for extraction is provided.

  FIG. 10 is a diagram showing ripple voltage characteristics of the smoothing capacitor 7. The smoothing capacitor 7 is connected between the DC lines 6a and 6b for the purpose of absorbing the ripple voltage included in the direct current that has been full-wave rectified by the rectifier 5, but the direct current of the smoothing capacitor 7 is not completely absorbed. Superimposed on the terminal voltage V. As the material deterioration of the smoothing capacitor 7 progresses, the ability to absorb the ripple voltage RP decreases, and the ripple voltage RP increases. Therefore, the life of the smoothing capacitor 7 can be determined by measuring the ripple voltage RP.

  In this embodiment, (the maximum value of the terminal voltage V−the minimum value of the terminal voltage V) is the ripple voltage RP, but the AC frequency of the AC power supply 1 in the triangular ripple voltage waveform shown in FIG. The amount of change in the duty ratio (B / A) indicating the ratio (B / A) of the voltage rise period B to the period A of the ripple voltage waveform determined by the equation may be used as the ripple voltage RP. That is, when the smoothing capacitor 7 is deteriorated, the absorption capacity is reduced and the voltage rises in a short time, so that the duty ratio (B / A) changes.

The range of the measured ripple voltage RP is divided into a normal value RP ₀ , an exchange reference value RP ₁ , a load limit reference value RP ₂ , and a stop reference value RP ₃ . When the ripple voltage RP measured by the ripple voltage measurement circuit 47 becomes equal to or higher than the replacement reference value (RP ₁ ) 40, the first characteristic determination unit 37 outputs an alarm message about the replacement timing of the smoothing capacitor 7 from the alarm output unit 43. . Regardless of the determination made by the first characteristic determination unit 37, the normal operation unit 32 is activated and the normal elevator operation is continued.

When the ripple voltage RP measured by the ripple voltage measurement circuit 47 reaches or exceeds the load limit operation reference value (RP ₂ ) 41, the second characteristic determination unit 38 activates the load limit operation unit 33. When the load limiting operation unit 33 is activated, the above-described operation for reducing the load on the electric motor 13 is performed.

The third characteristic determination unit 39 activates the operation stop unit 34 when the ripple voltage RP measured by the ripple voltage measurement circuit 47 becomes equal to or greater than the stop reference value (RP ₃ ) 42. When the operation stop unit 34 is activated, the operation of the elevator is stopped as described above.

FIG. 11 is a flowchart showing the overall operation of the elevator control apparatus of the third embodiment configured as described above. The power switch 3 is turned on in the elevator operation section 30, and the operation (movement) of the elevator (car 18) is started in response to the “call” generated in each floor or car 18 (S5-1). The ripple voltage RP is measured by the ripple voltage measuring circuit 47 (S5-2). When the ripple voltage RP is less than the replacement reference value RP ₁ (S5-3), the car 18 is moved to the destination floor designated by the call (S5-12), and the car 18 is stopped on that floor (S5- 13). Then, movement (operation) for the next call is started (S5-14).

When the ripple voltage RP is greater than or equal to the replacement reference value RP ₁ (S5-3), the alarm output unit 43 confirms that the life of the smoothing capacitor 7 has reached the replacement time, for example, via a communication line. A warning is issued (S5-4).

If the ripple voltage RP is less than the load limit reference value RP ₂ (S5-5), the car 18 is moved to the destination floor designated by the call (S5-12), and the car 18 is stopped on that floor ( S5-13).

When the ripple voltage RP is greater than or equal to the load limit reference value RP ₂ (S5-5) and less than the stop reference value RP ₃ (S5-6), the car 18 is temporarily stopped at the nearest floor (S5- 9). The load limiting operation unit 33 sets the operating conditions for the load limiting operation (S5-10). Then, movement (operation) for the next call is started (S5-14).

Further, when the ripple voltage RP is equal to or higher than the stop reference value RP ₃ (S5-6), after carrying out a protective operation such as mechanical fixing of the car 18 (S5-7), the operation stop unit 34 operates the elevator. Stop (S5-8).

  Also in the elevator control apparatus of the third embodiment configured as described above, in order to evaluate the ripple voltage absorption characteristic as one of the characteristics of the smoothing capacitor 7, the ripple voltage RP is constantly monitored and measured to determine the ripple voltage. Based on the measured value of RP, the degree of life (remaining life) is warned to the outside, and according to the degree of life (remaining life), damage due to the end of the smoothing capacitor 7 is prevented. Yes.

  Therefore, it is possible to achieve the same effect as the elevator control device of the first embodiment described above.

  FIG. 12 is a flowchart showing the entire operation of the modified elevator control apparatus according to the elevator control apparatus of the third embodiment described above. In this modification, the third characteristic determination unit 39, the stop reference value 42, and the operation stop unit 34 in the elevator control device of the third embodiment in FIG. 9 are not provided.

In the flowchart of FIG. 12, the power switch 3 is turned on in the elevator operation section 30, and the operation (movement) of the elevator (car 18) is started in response to the generated call (S6-1). The ripple voltage RP is measured by the ripple voltage measuring circuit 47 (S6-2). When the ripple voltage RP is less than the exchange reference value RP ₁ (S6-3), the car 18 is moved to the destination floor designated by the call (S6-10), and the car 18 is stopped on that floor (S6-). 11). Then, movement (operation) for the next call is started (S6-9).

When the ripple voltage RP is greater than or equal to the replacement reference value RP ₁ (S6-3), the alarm output unit 43 confirms that the life of the smoothing capacitor 7 has reached the replacement time, for example, via a communication line. A warning is issued (S6-4).

Further, when the ripple voltage RP is less than the load limit reference value RP ₂ (S6-5), the car 18 is moved to the destination floor designated by the call (S6-10), and the car 18 is stopped on that floor ( S6-11). Then, movement (operation) for the next call is started (S6-9).

When the ripple voltage RP is equal to or higher than the load limit reference value RP ₂ (S6-5), the car 18 is temporarily stopped at the nearest floor (S6-6). The load limiting operation unit 33 sets the operation conditions for the load limiting operation (S6-8). Then, movement (operation) for the next call is started (S6-9).

  Even in a modified elevator control device that is a simplified version of the elevator control device according to the third embodiment, the basic functions and effects of the present invention are sufficiently secured.

(Fourth embodiment)
FIG. 13 is a diagram showing a schematic configuration of an elevator control apparatus according to a fourth embodiment of the present invention. The same parts as those of the elevator control apparatus according to the third embodiment of the present invention shown in FIG. 9 are denoted by the same reference numerals, and the description of the overlapping parts is omitted.

  In the elevator control device of the fourth embodiment, the smoothing capacitor 7 of the elevator control device of the third embodiment shown in FIG. 9 is replaced with two smoothing capacitors 7a of the same specification connected between the DC wires 6a and 6b. It is replaced with a series circuit of 7b. Balance resistors 48a and 48b are connected in parallel to the smoothing capacitors 7a and 7b, respectively.

  The voltage sharing ratio measurement circuit 49 measures the terminal voltages Va and Vb of the smoothing capacitors 7a and 7b, and calculates the voltage sharing ratio RE of the measured terminal voltages Va and Vb.

Voltage sharing ratio RE = Vb / Va
If the deterioration of one of the two smoothing capacitors 7a and 7b connected in series progresses, the impedance value of the smoothing capacitors 7a and 7b that have progressed changes, so voltage sharing The rate RE = Vb / Va changes. Therefore, the life of the smoothing capacitors 7a and 7b can be determined by measuring the voltage sharing ratio RE as the characteristic value of the smoothing capacitor. In practice, since it is unclear which smoothing capacitors 7a and 7b are deteriorated, the amount of change from the initial value is adopted.

The range of the voltage sharing ratio RE is divided into a normal value RE ₀ , an exchange reference value RE ₁ , a load limit reference value RE ₂ , and a stop reference value RE ₃ . When the voltage sharing ratio RE measured by the voltage sharing ratio measuring circuit 49 becomes equal to or greater than the replacement reference value (RE ₁ ) 40, the first characteristic determination unit 37 issues an alarm for replacement timing of the smoothing capacitors 7a and 7b from the alarm output unit 43. Output a message. Regardless of the determination made by the first characteristic determination unit 37, the normal operation unit 32 is activated and the normal elevator operation is continued.

When the voltage sharing ratio RE measured by the voltage sharing ratio measuring circuit 49 becomes equal to or higher than the load limiting operation reference value (RE ₂ ) 41, the second characteristic determination unit 38 activates the load limiting operating unit 33. When the load limiting operation unit 33 is activated, the above-described operation for reducing the load on the electric motor 13 is performed.

The third characteristic determination unit 39 activates the operation stop unit 34 when the voltage sharing rate RE measured by the voltage sharing rate measurement circuit 49 becomes equal to or greater than the stop reference value (RE ₃ ) 42. When the operation stop unit 34 is activated, the operation of the elevator is stopped as described above.

FIG. 14 is a flowchart showing the overall operation of the elevator control apparatus according to the fourth embodiment configured as described above. The power switch 3 is turned on in the elevator operation section 30, and the operation (movement) of the elevator (car 18) is started in response to a “call” generated in each floor or car 18 (S7-1). The voltage sharing ratio RE is measured by the voltage sharing ratio measuring circuit 49 (S7-2). When the voltage sharing ratio RE is less than the exchange reference value RE ₁ (S7-3), the car 18 is moved to the destination floor designated by the call (S7-12), and the car 18 is stopped on that floor (S7). -13). Then, the movement (operation) for the next call is started (S7-14).

When the voltage sharing ratio RE is equal to or greater than the replacement reference value RE ₁ (S7-3), the alarm output unit 43 monitors that the smoothing capacitor 7 has reached the replacement time, for example, via a communication line. An alarm is issued to the center (S7-4).

If the voltage sharing ratio RE is less than the load limit reference value RE ₂ (S7-5), the car 18 is moved to the destination floor designated by the call (S7-12), and the car 18 is stopped on that floor. (S7-13). Then, the movement (operation) for the next call is started (S7-14). When the voltage sharing ratio RE is equal to or greater than the load limit reference value RE ₂ (S7-5) and less than the stop reference value RE ₃ (S7-6), the car 18 is temporarily stopped at the nearest floor ( S7-9). The load limiting operation unit 33 sets the operation conditions for the load limiting operation (S7-10). Then, the movement (operation) for the next call is started (S7-14).

When the voltage sharing ratio RE is equal to or greater than the stop reference value RE ₃ (S7-6), after carrying out a protective operation such as mechanical fixing of the car 18 (S7-7), the operation stop unit 34 operates the elevator. Is stopped (S7-8).

  Also in the elevator control apparatus of the fourth embodiment configured as described above, the voltage sharing ratio RE between the two capacitors is always monitored and measured as one of the characteristics of the smoothing capacitor in which the two smoothing capacitors 7a and 7b are connected in series. Then, the measured value of the voltage sharing ratio RE is used to warn the extent of the life (remaining life) to the outside, and the damage caused by the life of the smoothing capacitor 7 being exhausted according to the life (remaining life). Has been prevented.

  Therefore, it is possible to achieve substantially the same operational effects as the elevator control device of the third embodiment described above.

  FIG. 15 is a flowchart showing the overall operation of the modified elevator control apparatus according to the elevator control apparatus of the fourth embodiment described above. In this modification, the third characteristic determination unit 39, the stop reference value 42, and the operation stop unit 34 in the elevator control device of the fourth embodiment in FIG. 13 are not provided.

In the flowchart of FIG. 15, the power switch 3 is turned on in the elevator operation unit 30, and the operation (movement) of the elevator (car 18) is started according to the generated call (S8-1). The voltage sharing ratio measurement circuit 49 measures the voltage sharing ratio RE (S8-2). When the voltage sharing ratio RE is less than the exchange reference value RE ₁ (S8-3), the car 18 is moved to the destination floor designated by the call (S8-10), and the car 18 is stopped on that floor (S8). -11). Then, movement (operation) for the next call is started (S8-9).

When the voltage sharing ratio RE is greater than or equal to the replacement reference value RE ₁ (S8-3), the alarm output unit 43 indicates that the life of the smoothing capacitors 7a and 7b has reached the replacement time, for example, via a communication line. The alarm is issued to the monitoring center (S8-4).

Furthermore, when the voltage sharing ratio RE is less than the load limit reference value RE ₂ (S8-5), the car 18 is moved to the destination floor designated by the call (S8-10), and the car 18 is stopped on that floor. (S8-11). Then, movement (operation) for the next call is started (S8-9).

When the voltage sharing ratio RE is equal to or greater than the load limit reference value RE ₂ (S8-5), the car 18 is temporarily stopped at the nearest floor (S8-6). The load limiting operation unit 33 sets the operation conditions for the load limiting operation (S8-8). Then, movement (operation) for the next call is started (S8-9).

  Even in a modified elevator control device that is a simplified version of the elevator control device according to the fourth embodiment, the basic functions and effects of the present invention are sufficiently secured.

(Fifth embodiment)
FIG. 16 is a diagram showing a schematic configuration of an elevator control apparatus according to a fifth embodiment of the present invention. The same parts as those of the elevator control apparatus according to the third embodiment of the present invention shown in FIG. 9 are denoted by the same reference numerals, and the description of the overlapping parts is omitted.

  In the elevator control device of the fifth embodiment, the characteristic of the smoothing capacitor 7 is an absorption characteristic of the surge voltage SH generated in the terminal voltage of the smoothing capacitor 7 due to the switching operation of each switching element 9 of the inverter 8.

  In this embodiment, a surge voltage measuring circuit 50 is connected between the DC wires 6a and 6b. The surge voltage measurement circuit 50 measures the surge voltage SH generated in the terminal voltage of the smoothing capacitor 7 due to the switching operation of each switching element 9 of the inverter 8.

  FIG. 17 shows a waveform of a surge voltage generated due to the switching operation of each switching element 9 that is on / off controlled by the PWM (pulse width modulation) signal of the inverter 8 described above. When the time axis is expanded, the surge waveform 52 is superimposed on the pulse waveform 51. The smoothing capacitor 7 has a function of absorbing this surge voltage, but is superimposed on the DC terminal voltage V of the smoothing capacitor 7 without being completely absorbed. As the material deterioration of the smoothing capacitor 7 progresses, the total capacitor capacity decreases, the ability to absorb the surge voltage SH decreases, and the surge voltage SH increases. Therefore, the life of the smoothing capacitor 7 can be determined by measuring the surge voltage SH.

The range of the surge voltage SH is divided into a normal value SH ₀ , an exchange reference value SH ₁ , a load limit reference value SH ₂ , and a stop reference value SH ₃ . When the surge voltage SH measured by the surge voltage measurement circuit 50 becomes equal to or higher than the replacement reference value (SH ₁ ) 40, the first characteristic determination unit 37 outputs an alarm message about the replacement time of the smoothing capacitor 7 from the alarm output unit 43. . Regardless of the determination made by the first characteristic determination unit 37, the normal operation unit 32 is activated and the normal elevator operation is continued.

When the surge voltage SH measured by the surge voltage measurement circuit 50 becomes equal to or higher than the load limit reference value (SH ₂ ) 41, the second characteristic determination unit 38 activates the load limit operation unit 33. When the load limiting operation unit 33 is activated, the above-described operation for reducing the load on the electric motor 13 is performed.

The third characteristic determination unit 39 activates the operation stop unit 34 when the surge voltage SH measured by the surge voltage measurement circuit 50 becomes equal to or higher than the stop reference value (SH ₃ ) 42. When the operation stop unit 34 is activated, the operation of the elevator is stopped as described above.

FIG. 18 is a flowchart showing the overall operation of the elevator control apparatus of the fifth embodiment configured as described above. The power switch 3 is turned on in the elevator operation section 30 and the operation (movement) of the elevator (car 18) is started in response to the “call” generated in each floor or the car 18 (S9-1). The surge voltage SH is measured by the surge voltage measurement circuit 50 (S9-2). When the surge voltage SH is less than the exchange reference value SH ₁ (S9-3), the car 18 is moved to the destination floor designated by the call (S9-12), and the car 18 is stopped on that floor (S9- 13). Then, the movement (operation) for the next call is started (S9-14).

When the surge voltage SH is greater than or equal to the replacement reference value SH ₁ (S9-3), the alarm output unit 43 monitors whether the life of the smoothing capacitor 7 has reached the replacement time, for example, via a communication line. A warning is issued (S9-4).

Then, if a surge voltage SH is less than the load limit reference value SH ₂ (S9-5), then moved to the destination floor specified by the call cage 18 (S9-12), to stop the car 18 to the floor ( S9-13). When the surge voltage SH is greater than or equal to the load limit reference value SH ₂ (S9-5) and less than the stop reference value SH ₃ (S9-6), the car 18 is temporarily stopped at the nearest floor (S9- 9). The load limiting operation unit 33 sets operation conditions for the load limiting operation (S9-10). Then, the movement (operation) for the next call is started (S9-14).

Further, when the surge voltage SH is equal to or higher than the stop reference value SH ₃ (S9-6), after the protective operation of the car 18 (including temporarily stopping to the nearest floor in this case) (S9-7), The operation stop unit 34 stops the operation of the elevator (S9-8).

  Also in the elevator control apparatus of the fifth embodiment configured as described above, as one of the characteristics of the smoothing capacitor 7, the surge voltage SH is constantly monitored and measured, and the life level ( The remaining life) is alarmed to the outside, and damage due to the end of the life of the smoothing capacitor 7 is prevented according to the degree of life (remaining life).

  Therefore, it is possible to achieve substantially the same operational effects as the elevator control device of the third embodiment described above.

  FIG. 19 is a flowchart showing the overall operation of the modified elevator control apparatus according to the elevator control apparatus of the fifth embodiment described above. In this modification, the third characteristic determination unit 39, the stop reference value 42, and the operation stop unit 34 in the elevator control device of the fifth embodiment in FIG. 16 are not provided.

In the flowchart of FIG. 19, the power switch 3 is turned on in the elevator operation unit 30, and the operation (movement) of the elevator (car 18) is started according to the generated call (S <b> 10-1). The surge voltage SH is measured by the surge voltage measurement circuit 50 (S10-2). If the surge voltage SH is less than the replacement reference value SH ₁ (S10-3), the car 18 is moved to the destination floor designated by the call (S10-10), and the car 18 is stopped on that floor (S10- 11). Then, movement (operation) for the next call is started (S10-9).

When the surge voltage SH is equal to or higher than the replacement reference value SH ₁ (S10-3), the alarm output unit 43 determines that the life of the smoothing capacitor 7 has reached the replacement time, for example, via a communication line. A warning is issued (S10-4).

Further, when the surge voltage SH is less than the load limit reference value SH ₂ (S10-5), the car 18 is moved to the destination floor designated by the call (S10-10), and the car 18 is stopped on that floor ( S10-11). Then, movement (operation) for the next call is started (S10-9).

When the surge voltage SH is equal to or higher than the load limit reference value SH ₂ (S10-5), the car 18 is temporarily stopped at the nearest floor (S10-6). The load limiting operation unit 33 sets the operation conditions for the load limiting operation (S10-8). Then, movement (operation) for the next call is started (S10-9).

  Even in a modified elevator control device that is a simplified version of the elevator control device according to the fifth embodiment, the basic functions and effects of the present invention are sufficiently secured.

(Sixth embodiment)
FIG. 20 is a diagram showing a schematic configuration of the elevator control apparatus according to the sixth embodiment of the present invention. The same parts as those in the elevator control apparatus according to the first embodiment of the present invention shown in FIG.

  In the elevator control apparatus according to the sixth embodiment, an inrush current measuring circuit 53 is inserted in a DC line 6 a between the rectifier 5 and the smoothing capacitor 7. The inrush current measurement circuit 53 measures the inrush current SI flowing into the smoothing capacitor 7 when the power supply switch 3 is turned on and when the power supply from the AC power supply 1 to the power converter 4 is started, as a characteristic value of the smoothing capacitor 7. .

  FIG. 21 is a characteristic diagram showing a change in the current I flowing into the smoothing capacitor 7 when the power switch 3 is turned on. Prior to the time when the power switch 3 is turned on (t = 0), no charge is accumulated in the smoothing capacitor 7, so the equivalent impedance is very small. Flow into. When this initial time elapses, the inflow current I becomes substantially constant.

  If the inrush current SI (54) with respect to the smoothing capacitor 7 is increased, it has an adverse effect on each electric device including the motor 13, and therefore it is preferable that the inrush current SI is small. The inrush current SI has a great influence on the equivalent impedance of the smoothing capacitor 7, and the deterioration of the material of the smoothing capacitor 7 proceeds with time. Therefore, the deterioration life of the smoothing capacitor 7 can be determined by measuring the inrush current SI.

  Conversely, if the inrush current SI is large, the life of the smoothing capacitor 7 is shortened. Therefore, even in this case, the life of the smoothing capacitor 7 can be determined by measuring the inrush current SI.

The range of the inrush current SI is divided into a normal value SI ₀ , an exchange reference value SI ₁ , a load limit reference value SI ₂ , and a stop reference value SI ₃ . When the inrush current SI measured by the inrush current measuring circuit 53 becomes equal to or greater than the replacement reference value (SI ₁ ) 40, the first characteristic determination unit 37 outputs an alarm message about the replacement time of the smoothing capacitor 7 from the alarm output unit 43. . Then, regardless of the determination by the first characteristic determination unit 37, the normal operation unit 32 is activated to start a normal elevator operation.

The second characteristic determination unit 38 activates the load limiting operation unit 33 when the inrush current SI measured by the inrush current measuring circuit 53 becomes equal to or greater than the load limit reference value (SI ₂ ) 41. When the load limiting operation unit 33 is activated, the above-described operation for reducing the load on the electric motor 13 is performed.

The third characteristic determination unit 39 activates the operation stop unit 34 when the inrush current SI measured by the inrush current measurement circuit 53 becomes equal to or greater than the stop reference value (SH ₃ ) 42. When the operation stop unit 34 is activated, the operation of the elevator is stopped as described above.

FIG. 22 is a flowchart showing the overall operation of the elevator control apparatus of the sixth embodiment configured as described above. When the power switch 3 is turned on at the time t = 0 in the elevator operation unit 30 (step S11-1), the inrush current measurement circuit 53 measures the inrush current SI (S11-2). When the current SI is less than the replacement reference value SI ₁ (S11-3), the normal operation unit 32 starts the normal operation of the elevator (S11-10). When the inrush current SI is equal to or greater than the replacement reference value SI ₁ (S11-3), the alarm output unit 43 determines that the life of the smoothing capacitor 7 has reached the replacement time, for example, via a communication line. A warning is issued (S11-4).

When the inrush current SI is less than the load limit reference value SI ₂ (S11-5), the normal operation of the elevator is started (S11-10). When the inrush current SI is equal to or greater than the load limit reference value SI ₂ (S11-5), the load limit operation unit 33 sets the operation conditions for the load limit operation (S11-6). Furthermore, when the inrush current SI is less than the stop reference value SI ₃ (S11-7), the load limiting operation is started (S11-11). When the inrush current SI is equal to or greater than the stop reference value SI ₃ , after carrying out a protective operation such as mechanical fixing of the car 18 (S11-8), the operation stop unit 34 stops the operation of the elevator (S11-9). .

In the elevator control apparatus of the sixth embodiment configured as described above, an inrush current that is one of the characteristics of the smoothing capacitor 7 incorporated in the power conversion unit 4 that drives the electric motor 13 that moves the elevator car 18 up and down. SI is measured periodically, and the measured inrush current SI is the replacement reference value SI ₁ , the load limit reference value SI ₂ , the stop reference value SI _3, and the alarm is triggered and the load limit is increased as the characteristics deteriorate. The measures to be implemented will change in sequence, starting and stopping.

  Therefore, similarly to the elevator control device of the first embodiment described above, the life and abnormality of the smoothing capacitor 7 can be appropriately monitored and managed.

  FIG. 23 is a flowchart showing the overall operation of the modified elevator control apparatus according to the elevator control apparatus of the sixth embodiment described above. In this modification, the third characteristic determination unit 39, the stop reference value 42, and the operation stop unit 34 in the elevator control device of the sixth embodiment in FIG. 20 are not provided.

In the flowchart of FIG. 23, when the power switch 3 is turned on in the elevator operation unit 30 (S12-1), the inrush current measurement circuit 53 measures the inrush current SI (S12-2), and this inrush current SI. Is less than the exchange reference value SI ₁ (S12-3), the normal operation of the elevator is started in the normal operation unit 32 (S12-7). If the inrush current SI is replaced reference value SI ₁ or more, at alarm output unit 43, that the lifetime of the smoothing capacitor 7 has reached the replacement time for example, to alert onset report to a monitoring center via a communication line (S12-4).

When the inrush current SI is less than the load limit reference value SI ₂ (S12-5), the normal operation of the elevator is started (S12-7). When the inrush current SI is equal to or greater than the load limit reference value SI ₂ (S12-5), the load limit operation unit 33 starts the load limit operation (S12-6).

  Even in the modified elevator control device obtained by simplifying the elevator control device according to the sixth embodiment, the basic operational effects of the present invention are sufficiently secured.

(Seventh embodiment)
FIG. 24 is a diagram showing a schematic configuration of the elevator control apparatus according to the seventh embodiment of the present invention. The same parts as those of the elevator control apparatus according to the third embodiment of the present invention shown in FIG. 9 are denoted by the same reference numerals, and the description of the overlapping parts is omitted.

  In the elevator control apparatus of the seventh embodiment, a temperature sensor 55 such as a thermocouple is attached to the smoothing capacitor 7 of the power conversion unit 4, and the temperature (internal temperature, surface temperature, ambient temperature) of the smoothing capacitor 7 is measured by the temperature measurement circuit 56. Temperature etc.) TE is measured as one characteristic of the smoothing capacitor 7.

  The rise in temperature of the smoothing capacitor 7 is caused by deterioration of the constituent material of the smoothing capacitor 7 and an increase in resistance value, and heat generation during charging and discharging. Therefore, it is possible to know the life of the smoothing capacitor 7 by measuring the temperature TE.

Therefore, the range of the measured temperature TE is divided into a normal value TE ₀ , an exchange reference value TE ₁ , a load limit reference value TE ₂ , and a stop reference value TE ₃ . When the temperature TE measured by the temperature measurement circuit 56 becomes equal to or higher than the replacement reference value (TE ₁ ) 40, the first characteristic determination unit 37 outputs an alarm message about the replacement time of the smoothing capacitor 7 from the alarm output unit 43. Regardless of the determination made by the first characteristic determination unit 37, the normal operation unit 32 is activated and the normal elevator operation is continued.

When the temperature TE measured by the temperature measurement circuit 46 becomes equal to or higher than the load limit reference value (TE ₂ ) 41, the second characteristic determination unit 38 activates the load limit operation unit 33. When the load limiting operation unit 33 is activated, the above-described operation for reducing the load on the electric motor 13 is performed.

The third characteristic determination unit 39 activates the operation stop unit 34 when the temperature TE measured by the temperature measurement circuit 56 becomes equal to or higher than the stop reference value (TE ₃ ) 42. When the operation stop unit 34 is activated, the operation of the elevator is stopped as described above.

FIG. 25 is a flowchart showing the overall operation of the elevator control apparatus of the seventh embodiment configured as described above. The power switch 3 is turned on in the elevator operation section 30, and the operation (movement) of the elevator (car 18) is started in response to a “call” generated in each floor or car 18 (S13-1). The temperature TE is measured by the temperature measurement circuit 56 (S13-2). When the temperature TE is less than the replacement reference value TE ₁ (S13-3), the car 18 is moved to the destination floor designated by the call (S13-12), and the car 18 is stopped on that floor (S13-13). ). Then, the movement (operation) for the next call is started (S13-14).

When the temperature TE is equal to or higher than the replacement reference value TE ₁ (S13-3), the alarm output unit 43 informs the monitoring center that the life of the smoothing capacitor 7 has reached the replacement time, for example, via a communication line. An alarm is issued (S13-4).

If the temperature TE is less than the load limit reference value TE ₂ (S13-5), the car 18 is moved to the destination floor designated by the call (S13-12), and the car 18 is stopped on that floor (S13). -13). Then, the movement (operation) for the next call is started (S13-14).

When the temperature TE is equal to or higher than the load limit reference value TE ₂ (S13-5) and less than the stop reference value TE ₃ (S13-6), the car 18 is temporarily stopped at the nearest floor (S13-9). ). The load limiting operation unit 33 sets the operation conditions for the load limiting operation (S13-10). Then, the movement (operation) for the next call is started (S13-14).

Further, when the temperature TE is equal to or higher than the stop reference value TE ₃ , after the protective operation of the car 18 (in this case, including temporarily stopping to the nearest floor) (S13-7), the operation stop unit 34 is The operation of the elevator is stopped (S13-8).

  Also in the elevator control apparatus of the seventh embodiment configured as described above, as one of the characteristics of the smoothing capacitor 7, the temperature TE is constantly monitored and measured, and the degree of life (remaining life) is determined by the measured value of the temperature TE. ) To the outside, and the damage due to the end of the life of the smoothing capacitor 7 is prevented according to the degree of life (remaining life).

  Therefore, it is possible to achieve substantially the same operational effects as the elevator control device of the third embodiment described above.

  FIG. 26 is a flowchart showing the overall operation of the modified elevator control apparatus according to the elevator control apparatus of the seventh embodiment described above. In this modification, the third characteristic determination unit 39, the stop reference value 42, and the operation stop unit 34 in the elevator control device of the seventh embodiment in FIG. 24 are not provided.

In the flowchart of FIG. 26, the power switch 3 is turned on in the elevator operation section 30, and the operation (movement) of the elevator (car 18) is started according to the generated call (S14-1). The temperature TE is measured by the temperature measurement circuit 56 (S14-2). When the temperature TE is less than the exchange reference value TE ₁ (S14-3), the car 18 is moved to the destination floor designated by the call (S14-10), and the car 18 is stopped on that floor (S14-11). ). Then, movement (operation) for the next call is started (S14-9).

When the temperature TE is equal to or higher than the replacement reference value TE ₁ (S14-3), the alarm output unit 43 notifies the monitoring center that the life of the smoothing capacitor 7 has reached the replacement time, for example, via a communication line. An alarm is issued (14-4).

Further, when the temperature TE is lower than the load limit reference value TE ₂ (S14-5), the car 18 is moved to the destination floor designated by the call (S14-10), and the car 18 is stopped on that floor (S14). -11). Then, movement (operation) for the next call is started (S14-9).

When the temperature TE is equal to or higher than the load limit reference value TE ₂ (S14-5), the car 18 is temporarily stopped at the nearest floor (S14-6). The load limiting operation unit 33 sets the operation conditions for the load limiting operation (S14-8). Then, movement (operation) for the next call is started (S14-9).

  Even in a modified elevator control device in which the elevator control device according to the seventh embodiment is simplified, the basic operational effects of the present invention are sufficiently secured.

The figure which shows schematic structure of the elevator control apparatus concerning 1st Embodiment of this invention. The figure which shows the charge time constant measured as a characteristic of a smoothing capacitor with the elevator control apparatus of the said 1st Embodiment The flowchart which shows the whole operation | movement of the elevator control apparatus of said 1st Embodiment. The flowchart which shows the whole operation | movement of the elevator control apparatus concerning the modification of 1st Embodiment. The figure which shows schematic structure of the elevator control apparatus concerning 2nd Embodiment of this invention. The figure which shows the discharge time constant measured as a characteristic of a smoothing capacitor with the elevator control apparatus of the said 2nd Embodiment The flowchart which shows the whole operation | movement of the elevator control apparatus of 2nd Embodiment. The flowchart which shows the whole operation | movement of the elevator control apparatus concerning the modification of 2nd Embodiment. The figure which shows schematic structure of the elevator control apparatus concerning 3rd Embodiment of this invention. The figure which shows the ripple voltage measured as a characteristic of a smoothing capacitor with the elevator control apparatus of the said 3rd Embodiment The flowchart which shows the whole operation | movement of the elevator control apparatus of the 3rd Embodiment. The flowchart which shows the whole operation | movement of the elevator control apparatus concerning the modification of 3rd Embodiment. The figure which shows schematic structure of the elevator control apparatus concerning 4th Embodiment of this invention. The flowchart which shows the whole operation | movement of the elevator control apparatus of 4th Embodiment. The flowchart which shows the whole operation | movement of the elevator control apparatus concerning the modification of 4th Embodiment. The figure which shows schematic structure of the elevator control apparatus concerning 5th Embodiment of this invention. The figure which shows the surge voltage measured as a characteristic of a smoothing capacitor with the elevator control apparatus of the said 5th Embodiment The flowchart which shows the whole operation | movement of the elevator control apparatus of 5th Embodiment. The flowchart which shows the whole operation | movement of the elevator control apparatus concerning the modification of 5th Embodiment. The figure which shows schematic structure of the elevator control apparatus concerning 6th Embodiment of this invention. The figure which shows the inrush current measured as a characteristic of a smoothing capacitor with the elevator control apparatus of the said 6th Embodiment The flowchart which shows the whole operation | movement of the elevator control apparatus of 6th Embodiment. The flowchart which shows the whole operation | movement of the elevator control apparatus concerning the modification of 6th Embodiment. The figure which shows schematic structure of the elevator control apparatus concerning 7th Embodiment of this invention. The flowchart which shows the whole operation | movement of the elevator control apparatus of 7th Embodiment. The flowchart which shows the whole operation | movement of the elevator control apparatus concerning the modification of the said 7th Embodiment. The figure which shows schematic structure of the conventional elevator control apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... AC power source, 3 ... Power switch, 4 ... Power conversion part, 5 ... Rectifier, 7, 7a, 7b ... Smoothing capacitor, 8 ... Inverter, 9 ... Switching element, 10 ... Inverter drive circuit, 13 ... Electric motor, 18 ... Car, 22 ... car call registration device, 23 ... landing call registration device, 30 ... elevator operation unit, 31 ... call assignment unit, 32 ... normal operation unit, 33 ... load limit operation unit, 34 ... operation stop unit, 35 ... charge Circuit 36... Charging time constant measuring circuit 37... First characteristic determination unit 38. Second characteristic determination unit 39. Third characteristic determination unit 40. Replacement reference value 41. Load limit reference value 42 Stop Reference value 43 ... alarm output unit 45 ... discharge circuit 46 ... discharge time constant measurement circuit 47 ... ripple voltage measurement circuit 49 ... voltage share measurement circuit 50 ... surge voltage measurement circuit 53 ... inrush current measurement circuit 55 ... Degree sensor, 56 ... temperature measurement circuit

Claims (10)

An electric motor that moves the elevator car to each floor of the building, and alternating current supplied from an alternating current power source is converted to direct current by a rectifier, and this direct current is smoothed by a smoothing capacitor, and then converted to alternating current by an inverter that bridge-connects switching elements A power conversion unit that converts and supplies the electric motor, and an inverter drive circuit that controls conduction of each switching element of the inverter of the power conversion unit to control the frequency and power value of the alternating current supplied to the electric motor, In an elevator control device having an elevator operation unit that sends a movement command to the inverter drive circuit to move a car to a floor designated by the call operation in response to a call operation in each floor and car,
Capacitor characteristic measuring means for periodically measuring the characteristics of the smoothing capacitor;
First characteristic determining means for determining whether or not the characteristic value of the capacitor measured by the capacitor characteristic measuring means has reached a predetermined replacement reference value indicating that the life of the smoothing capacitor has been approached;
An elevator control apparatus comprising: an alarm output means for outputting an alarm for approaching the life of the smoothing capacitor when the first characteristic determining means determines that the characteristic value has reached the replacement reference value. Second characteristic determining means for determining whether or not the characteristic value of the capacitor measured by the capacitor characteristic measuring means has reached a load limit reference value that is closer to the life of the smoothing capacitor than the replacement reference value;
When the second characteristic determination means determines that the characteristic value has reached a load limit reference value, the second characteristic determination means includes load limit operation means for instructing the elevator operation section to perform load limit operation. Item 2. The elevator control device according to Item 1. Third characteristic determining means for determining whether or not the characteristic value of the capacitor measured by the capacitor characteristic measuring means has reached a stop reference value that is closer to the life of the smoothing capacitor than the load limit reference value;
The operation stop means for instructing the elevator operation unit to stop operation when the third characteristic determination means determines that the characteristic value has reached a stop reference value. The elevator control device described. The characteristic of the smoothing capacitor is a charging time constant,
The capacitor characteristic measuring means is a charging time constant measuring circuit that measures a charging time constant indicating a time change of a terminal voltage rise of the smoothing capacitor at the start of supply of the AC power to the power converter. The elevator control device according to any one of claims 1 to 3. The characteristic of the smoothing capacitor is a discharge time constant,
The capacitor characteristic measuring means is a discharge time constant measuring circuit for measuring a discharge time constant indicating a time change of a terminal voltage drop of the smoothing capacitor when the supply of the AC power supply to the power converter is stopped. The elevator control device according to any one of claims 1 to 3. The characteristic of the smoothing capacitor is a ripple voltage absorption characteristic,
The capacitor characteristic measuring means is a ripple voltage measuring circuit that measures a terminal voltage of the smoothing capacitor to which a DC voltage including a ripple component output from the rectifier is applied and extracts the ripple voltage from the terminal voltage. The elevator control device according to any one of claims 1 to 3. The characteristic of the smoothing capacitor is a change in the voltage sharing ratio between the capacitors when the smoothing capacitor is composed of a plurality of capacitors connected in series.
The capacitor characteristic measuring unit measures the terminal voltage of each of the capacitors connected in series, calculates a voltage ratio between the measured terminal voltages, and outputs the voltage ratio as a voltage sharing ratio between the capacitors. The elevator control device according to any one of claims 1 to 3, wherein the elevator control device is a rate measuring circuit. The characteristic of the smoothing capacitor is a surge voltage absorption characteristic,
The capacitor characteristic measuring means measures a terminal voltage of a smoothing capacitor, and extracts and outputs a surge voltage generated by the switching operation of each switching element of the inverter included in the measured terminal voltage. The elevator control device according to any one of claims 1 to 3, wherein The characteristic of the smoothing capacitor is an inrush current characteristic,
4. The inrush current measuring circuit for measuring the inrush current flowing into the smoothing capacitor at the start of supply of the AC power source to the power conversion unit. The elevator control device according to claim 1. The characteristic of the smoothing capacitor is temperature,
The elevator control apparatus according to any one of claims 1 to 3, wherein the capacitor characteristic measuring means is a temperature measuring circuit that measures a temperature of the smoothing capacitor.

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