JP2011139632A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To significantly extend the service life of a switching element of an inverter device of an elevator. <P>SOLUTION: When a difference between a temperature around the switching element of the inverter device 4 and a temperature outside a power converter becomes a predetermined value or smaller during stop of the elevator, before starting the elevator, current is gradually applied to a set phase of the motor to gradually increase the current to be applied to the switching element, and the temperature of the switching element is gradually increased by heat generated due to current conduction. Therefore, a sudden temperature stress is prevented from being applied to the switching element. Thereby, the service life of the switching element mounted on the inverter device 4 can be extended. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  Embodiments described herein relate generally to an elevator controller having a cooling function of a switching element installed in a power converter that supplies current to an elevator drive motor.

  Conventionally, for example, as disclosed in Patent Document 1, a cooling fan for preventing an excessive temperature rise of a switching element of an inverter device of an elevator has been provided, and the cooling fan is operated during operation of the inverter device. The switching element of the inverter device is cooled.

JP 2006-199465 A

  When the elevator stops, the cooling fan is stopped when the operation of the inverter device stops. However, the cooling device is cooled until the temperature of the switching element of the inverter device becomes sufficiently low even after the operation of the inverter device stops. The fan is continuously operated, and the cooling fan is stopped when the temperature of the switching element becomes sufficiently low.

  In this way, if the cooling fan continues to be driven even when the operation of the inverter device is stopped, the switching element of the inverter device is rapidly cooled, resulting in excessive temperature stress on the switching element. The service life will be shortened.

  In order to solve this problem, it may be possible to improve the performance of the cooler and suppress the temperature rise of the switching element during elevator operation, but the cost of the cooler is significantly higher. turn into.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator controller that can perform cooling for significantly improving the service life of a switching element of an inverter device.

  That is, the elevator controller according to the present invention includes a rectifier circuit that converts AC power from an AC power source into DC power, a smoothing capacitor that smoothes pulsation of DC power converted by the rectifier circuit, and the smoothed circuit. An inverter device including a switching element for converting the DC power into AC power having a variable voltage and variable frequency, and an electric motor driven by the AC power output from the inverter device, and the operation of the inverter device is stopped. In the case where the difference between the temperature near the switching element of the inverter device and the temperature outside the inverter device is equal to or less than a predetermined value, the predetermined phase of the electric motor is started before the operation of the inverter device is started. And an energization control means for energizing the current gradually.

  ADVANTAGE OF THE INVENTION According to this invention, the service life of the switching element of the inverter apparatus of an elevator can be improved significantly.

The figure which shows the structural example which noted the power converter of the elevator control apparatus in the 1st Embodiment of this invention. The flowchart which shows an example of the processing operation for cooling of the inverter apparatus of the elevator control apparatus in the 1st Embodiment of this invention. The figure which shows the structural example which noted the power converter of the elevator control apparatus in the 2nd Embodiment of this invention. The flowchart which shows an example of the processing operation for cooling of the inverter apparatus of the elevator control apparatus in the 2nd Embodiment of this invention. The figure which shows the structural example which noted the power converter of the elevator control apparatus in the 3rd Embodiment of this invention. The flowchart which shows an example of the processing operation for cooling of the inverter apparatus of the elevator control apparatus in the 3rd Embodiment of this invention. The figure which shows the structural example which noted the power converter of the elevator control apparatus in the 4th Embodiment of this invention. The flowchart which shows an example of the processing operation for cooling of the inverter apparatus of the elevator control apparatus in the 4th Embodiment of this invention. The figure which shows the structural example which noted the power converter of the elevator control apparatus in the 5th Embodiment of this invention. The flowchart which shows an example of the processing operation for cooling of the inverter apparatus of the elevator control apparatus in the 5th Embodiment of this invention. The figure which shows the structural example which noted the power converter of the elevator control apparatus in the 6th Embodiment of this invention. The flowchart which shows an example of the process operation for cooling of the inverter apparatus of the elevator control apparatus in the 6th Embodiment of this invention. The figure which shows the structural example which noted the power converter of the elevator control apparatus in the 7th Embodiment of this invention. The flowchart which shows an example of the processing operation for cooling of the inverter apparatus of the elevator control apparatus in the 7th Embodiment of this invention. The figure which shows the structural example which noted the power converter of the elevator control apparatus in the 8th Embodiment of this invention. The flowchart which shows an example of the processing operation for cooling of the inverter apparatus of the elevator control apparatus in the 8th Embodiment of this invention.

(First embodiment)
First, a first embodiment of the present invention will be described. In the following embodiments, the present invention will be described by taking an elevator as an example. However, the present invention described in each embodiment except for a third embodiment to be described later can also be applied to other elevators such as an escalator. .

  FIG. 1 is a diagram illustrating a configuration example in which the power conversion unit of the elevator control device according to the first embodiment of the present invention is specially described.

  As shown in FIG. 1, the elevator control device according to the first embodiment of the present invention includes a three-phase AC power source 1, a converter device 2, a smoothing capacitor 3, an inverter device 4, an elevator drive motor 5, and an elevator as a drive system. A control microcomputer 6, a fan drive power supply 7, a fan drive relay 8, a cooling fan 9, and a gate drive circuit 10 are provided.

  The three-phase AC power source 1 supplies AC power of a predetermined power as a commercial power source. Converter device 2 converts AC power supplied from three-phase AC power supply 1 into DC power. Smoothing capacitor 3 smoothes the pulsation of DC power that is the output power of converter device 2. The inverter device 4 is equipped with a switching element. By this switching element, the DC power supplied from the converter device 2 via the smoothing capacitor 3 is converted into AC power having a variable frequency variable voltage value by PWM (Pulse Width Modulation) control. This is converted and supplied to the elevator drive motor 5 as drive power.

  A sheave 11 is attached to the rotating shaft of the elevator drive motor 5, and a car 13 and a counterweight 14 are lifted and lowered in a hoistway through a rope 12 wound around the sheave 11. The elevator drive motor 5 is driven by the AC power output from the inverter device 4 to raise and lower the car 13.

  The cooling fan 9 is installed in the vicinity of the inverter device 4 and cools the switching element mounted on the inverter device 4.

  The cooling fan 9 is connected to the fan drive power source 7 via the fan drive relay 8. When the fan drive relay 8 is in the ON state, the fan drive power supply 7 and the cooling fan 9 are electrically connected, so the cooling fan 9 is driven by the fan drive power supply 7 and the fan drive relay 8 is turned off. In the state, the circuit between the fan drive power supply 7 and the cooling fan 9 is cut off, and the cooling fan 9 stops.

  The elevator control microcomputer 6 is configured by a computer on which a CPU, a ROM, a RAM, and the like are mounted. The elevator control microcomputer 6 includes a start / stop determination unit 6a for determining start and stop of the elevator, and a relay control unit 6b for controlling ON / OFF of the fan drive relay 8. Moreover, the gate drive circuit 10 gives each control signal from the microcomputer 6 for elevator control to the inverter apparatus 4 as a gate voltage.

  Next, the operation of the elevator control device having the configuration shown in FIG. 1 will be described.

  FIG. 2 is a flowchart illustrating an example of a processing operation for cooling the inverter device of the elevator control device according to the first embodiment of the present invention.

  When the start / stop determining unit 6a of the elevator control microcomputer 6 determines that the elevator is started, that is, the operation is started (step S1), the elevator control microcomputer 6 supplies power to the inverter device 4 through the gate drive circuit 10. The relay control unit 6b turns on the fan drive relay 8 in conjunction with the activation (step S2). As a result, the cooling fan 9 is driven by the fan drive power source 7 (step S3), and the operation is performed while cooling the heat generated in the switching element of the inverter device 4 by energization.

  When the start / stop determination unit 6a of the elevator control microcomputer 6 determines that the operation of the elevator has stopped (step S4), the relay control unit 6b turns off the fan drive relay 8 in conjunction with the stop. (Step S5). Thereby, the circuit between the fan drive power supply 7 and the cooling fan 9 is cut off, and the cooling fan 9 is stopped (step S6). That is, the elevator control microcomputer 6 is a cooling fan driving unit that drives the cooling fan when the operation of the inverter device starts and stops the cooling fan when the operation of the inverter device stops. The same applies to the following embodiments.

  As described above, in the elevator control device according to the first embodiment of the present invention, the cooling fan 9 is driven in conjunction with the start of the elevator to cool the heat generated by the switching elements mounted on the inverter device 4, and the elevator Since the cooling fan 9 is stopped in conjunction with the stop of the operation, the switching element of the inverter device 4 is naturally air-cooled. Therefore, it is possible to prevent a sudden temperature stress from being applied to the switching element generated by current application. . Therefore, it is possible to extend the life of the switching element mounted on the inverter device 4. Further, since the driving time of the cooling fan 9 is shortened, an energy saving effect can be expected.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In addition, description of the same part as what was shown in FIG. 1 among the structures of the elevator control apparatus in each following embodiment is abbreviate | omitted.

  FIG. 3 is a diagram illustrating a configuration example in which the power conversion unit of the elevator control device according to the second embodiment of the present invention is specially described.

  The elevator control device in this embodiment further includes a gate voltage monitoring circuit 21 of the gate drive circuit 10 as compared with the first embodiment.

  FIG. 4 is a flowchart illustrating an example of a processing operation for cooling the inverter device of the elevator control device according to the second embodiment of the present invention.

  In this embodiment, the gate voltage monitoring circuit 21 constantly monitors whether or not the gate voltage of the gate drive circuit 10 is switched at a predetermined frequency and voltage that can be regarded as during elevator operation (step S21).

  The elevator control microcomputer 6 acquires the monitoring result by the gate voltage monitoring circuit 21, and when the monitoring result is the monitoring result that the gate voltage is switched at the predetermined frequency and voltage described above, It is determined that the elevator has been started and is in an operating state (YES in step S22). In this case, the relay controller 6b turns on the fan driving relay 8 (step S2). As a result, the cooling fan 9 is driven by the fan drive power source 7 (step S3), and the operation is performed while cooling the heat generated in the switching element of the inverter device 4 by energization.

  On the other hand, when the monitoring result from the gate voltage monitoring circuit 21 is the monitoring result that the gate voltage is not switched at the predetermined frequency and voltage, the elevator control microcomputer 6 is not in the elevator operation. (NO in step S22). In this case, the relay controller 6b turns off the fan drive relay 8 (step S5). Thereby, the circuit between the fan drive power supply 7 and the cooling fan 9 is cut off, and the cooling fan 9 is stopped (step S6).

  As described above, in the elevator control device according to the second embodiment of the present invention, when the switching element of the inverter device 4 is switched at a predetermined frequency and voltage, the cooling fan 9 is driven to drive the inverter device 4. The switching element is cooled, and when the gate voltage is not switched at a predetermined frequency and voltage, the cooling fan 9 is stopped and the switching element mounted in the inverter device 4 is naturally air-cooled. Similar to the embodiment, it is possible to prevent a sudden temperature stress from being applied to the switching element. Therefore, it is possible to extend the life of the switching element mounted on the inverter device 4.

(Third embodiment)
Next, a third embodiment of the present invention will be described.

  FIG. 5 is a diagram illustrating a configuration example in which the power conversion unit of the elevator control device according to the third embodiment of the present invention is specially described.

  In this embodiment, the hall call button 22 and the car destination floor button 23 not described in the first embodiment will also be described.

  Unlike the first embodiment, the elevator control microcomputer 6 includes a call presence / absence determination unit 6c and a relay control unit 6b. The call presence / absence determination unit 6c determines whether or not there is a call that has been registered and has not been answered by operating the hall call button 22 or the car destination floor button 23.

  FIG. 6 is a flowchart illustrating an example of a processing operation for cooling the inverter device of the elevator control device according to the third embodiment of the present invention.

  Here, as an initial state, the elevator is in operation, and the switching element mounted on the inverter device 4 is cooled by the cooling fan 9 that is driven together with the start of the operation of the elevator as in the first embodiment. And

  When the hall call button 22 or the car destination floor button 23 is operated, a call registration signal is output to the elevator control microcomputer 6.

  The elevator control microcomputer 6 performs call registration in response to signals from the hall call button 22 and the car in-destination floor button 23, and holds call registration information, which is a call before answering, in the internal memory.

  When it is determined that there is a call registration (YES in step S31), the call presence / absence determination unit 6c of the elevator control microcomputer 6 determines that the elevator is stopped and then restarted, that is, continuously operated. In this case, the relay control unit 6b maintains the fan driving relay 8 in the ON state even when the elevator stops (step S2). As a result, the cooling fan 9 is continuously driven by the fan drive power supply 7 (step S3), and the cooling of the heat generation of the switching elements of the inverter device 4 by energization is maintained.

  On the other hand, if the call presence / absence determination unit 6c of the elevator control microcomputer 6 determines that there is no call registration (NO in step S31), the elevator is currently stopped and is operated until the next call registration is made. Is not restarted, that is, it is determined that the elevator is not continuously operated. In this case, the relay controller 6b turns off the fan drive relay 8 (step S5). Thereby, the circuit between the fan drive power supply 7 and the cooling fan 9 is cut off, and the cooling fan 9 is stopped (step S6).

  As described above, in the elevator control apparatus according to the third embodiment of the present invention, when there is a call registration, it is determined that there is continuous operation, and even if the elevator stops, the drive of the cooling fan 9 is maintained and the inverter is maintained. When the switching element of the device 4 is continuously cooled and no call registration is made, the cooling fan 9 is stopped and the switching element mounted in the inverter device 4 is cooled by natural air cooling. You can avoid stress. Therefore, it is possible to extend the life of the switching element mounted on the inverter device 4.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.

  FIG. 7 is a diagram illustrating a configuration example in which the power conversion unit of the elevator control device according to the fourth embodiment of the present invention is specially described.

  This embodiment further includes a switching element temperature detector 24, an external temperature detector 25, and a temperature calculation device 26, as compared with the first embodiment. In this embodiment, the fan drive power supply 7, the fan drive relay 8, and the cooling fan 9 used in the first embodiment are not provided.

  The switching element temperature detector 24 detects the temperature of the switching element mounted on the inverter device 4. The external temperature detector 25 detects the temperature of the outside, in this case, where heat is not generated from the inverter device 4.

  The temperature calculation device 26 calculates the difference between the temperature detected by the switching element temperature detector 24 and the temperature detected by the external temperature detector 25.

  Unlike the first embodiment, the elevator control microcomputer 6 includes an energization control unit 6d. The energization control unit 6 d performs energization control to the inverter device 4 via the gate drive circuit 10.

  FIG. 8 is a flowchart illustrating an example of a processing operation for cooling the inverter device of the elevator control device according to the fourth embodiment of the present invention.

  As an initial state, it is assumed that the elevator is in operation. When the operation of the elevator is stopped in this state, that is, when the registered call is lost (step S51), the elevator control microcomputer 6 detects the temperature detected by the switching element temperature detector 24 with respect to the temperature calculation device 26. And the calculation of the difference between the temperature detected by the external temperature detector 25 is instructed.

  Then, the temperature calculation device 26 acquires the temperature detected by the switching element temperature detector 24 and the temperature detected by the external temperature detector 25 (steps S42 and S43), calculates the difference between the two, and the calculation result Is output to the microcomputer 6 for elevator control.

  When the difference as the calculation result is equal to or less than a predetermined value (YES in step S44), the elevator control microcomputer 6 causes the temperature of the switching element of the inverter device 4 to be excessive after the next operation starts. It is determined that the temperature has dropped to a temperature that causes temperature stress. In this case, the energization control unit 6d of the elevator control microcomputer 6 causes the gate drive circuit 10 to operate the elevator drive motor 5 via the inverter device 4 before the start of the operation of the inverter device 4 when a new call is registered. By gradually energizing the set phase and gradually increasing the energizing current to the switching element mounted on the inverter device 4, the temperature of the switching element is gradually increased by the heat generated by the energizing current (step S45). ).

  On the other hand, when the difference as the calculation result exceeds the above-described predetermined value (NO in step S44), the elevator control microcomputer 6 determines that the temperature of the switching element of the inverter device 4 becomes the switching element after the start of the next operation. It is judged that the temperature has not dropped to a temperature that causes excessive temperature stress on. In this case, the energization control unit 6d of the elevator control microcomputer 6 does not energize the set phase of the elevator drive motor 5.

  Thereafter, when the operation of the elevator is started (step S46), the temperature of the switching element has risen to some extent, so that the temperature stress on the switching element due to the operation is reduced.

  As described above, in the elevator control device according to the fourth embodiment of the present invention, the difference between the temperature in the vicinity of the switching element of the inverter device 4 and the temperature outside the power conversion unit is less than or equal to a predetermined value while the operation of the elevator is stopped. In this case, before starting the elevator operation, a current is gradually supplied to the set phase of the motor to gradually increase the current supplied to the switching element, and the temperature of the switching element is gradually increased by the heat generated by the current application. Since the operation is performed after the temperature is raised to a rapid temperature, it is possible to prevent sudden temperature stress from being applied to the switching element. Therefore, it is possible to extend the life of the switching element mounted on the inverter device 4.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described.

  FIG. 9 is a diagram illustrating a configuration example in which the power conversion unit of the elevator control device according to the fifth embodiment of the present invention is specially described.

  In this embodiment, unlike the first embodiment, the cooling fans are provided with two cooling fans 9A and 9B, and the fan driving relays correspond to the cooling fans 9A and 9B, respectively. Two of 8B are provided. Further, this embodiment further includes a fan drive circuit 27 that switches between driving and stopping of the cooling fans 9A and 9B by individually switching ON / OFF of the fan driving relays 8A and 8B.

  The cooling fan 9A is connected to the fan drive power supply 7 via the fan drive relay 8A, and the cooling fan 9B is connected to the fan drive power supply 7 via the fan drive relay 8B.

  When the fan driving relay 8A is in the ON state, the cooling fan 9A is driven by the fan driving power source 7, and when the fan driving relay 8A is in the OFF state, the fan driving power source 7 is connected between the fan driving power source 7 and the cooling fan 9A. The circuit is cut off and the cooling fan 9A is stopped.

  When the fan drive relay 8B is in the ON state, the cooling fan 9B is driven by the fan drive power supply 7, and when the fan drive relay 8B is in the OFF state, the fan drive power supply 7 and the cooling fan 9B are connected. The circuit between them is cut off, and the cooling fan 9B stops.

  Further, it is assumed that the cooling capacity of each of the cooling fans 9A and 9B is half that of the cooling fan described in the first embodiment.

  Further, unlike the first embodiment, the elevator control microcomputer 6 does not include the start / stop determination unit 6a and the relay control unit 6b.

  FIG. 10 is a flowchart illustrating an example of a processing operation for cooling the inverter device of the elevator control device according to the fifth embodiment of the present invention.

  When the elevator control microcomputer 6 determines that the elevator is activated (step S1), the elevator control microcomputer 6 causes the gate drive circuit 10 to start energization of the inverter device 4, and the fan drive circuit 27 determines this determination. In conjunction with this, the fan drive relays 8A and 8B are turned on (step S49). As a result, the cooling fans 9A and 9B are driven by the fan drive power source 7 (step S50), and the operation is performed while cooling the heat generated in the switching device of the inverter device 4 by energization.

  When the operation of the elevator is stopped (step S51), the elevator control microcomputer 6 calculates the difference between the temperature detected by the switching element temperature detector 24 and the temperature detected by the external temperature detector 25 with respect to the temperature calculation device 26. Instruct.

  Then, the temperature calculation device 26 acquires the temperature detected by the switching element temperature detector 24 and the temperature detected by the external temperature detector 25 (steps S52 and S53), calculates the difference between the two, and the calculation result Is output to the fan drive circuit 27.

  The fan drive circuit 27 turns OFF the fan drive relay 8B (step S55) when the difference, which is the calculation result of the temperature calculation device 26, is greater than or equal to a predetermined value (YES in step S54). Thereby, the circuit between the fan drive power supply 7 and the cooling fan 9B is cut off, and the cooling fan 9B is stopped (step S56). Thereby, the switching element mounted on the inverter device 4 is gradually cooled only by the cooling fan 9A.

  Thereafter, when the difference, which is the calculation result of the temperature calculation device 26, is less than the predetermined value (YES in step S57), the fan drive circuit 27 turns off the fan drive relay 8A (step S58). ). As a result, the circuit between the fan drive power supply 7 and the cooling fan 9A is cut off, and the cooling fan 9A stops (step S59). Thereby, both the cooling fans 9A and 9B are stopped, and the natural air cooling of the switching element mounted on the inverter device 4 is performed.

  As described above, in the elevator control device according to the fifth embodiment of the present invention, when a plurality of cooling fans for cooling the switching elements of the inverter device 4 are used in one power conversion device, the operation of the elevator is performed. When the difference between the temperature in the vicinity of the switching element and the temperature outside the power converter becomes equal to or greater than a predetermined value during the stop, the switching element is gradually cooled by reducing the number of cooling fan drives to a predetermined number. When the difference becomes less than the predetermined value, the remaining cooling fan is stopped and cooled by natural air cooling of the switching elements mounted on the inverter device, and the cooling capacity is gradually reduced in several stages. Therefore, it is possible to prevent a sudden temperature stress from being applied to the switching element. Therefore, it is possible to extend the life of the switching element mounted on the inverter device 4.

  In this embodiment, it has been described that there are two sets of cooling fans and fan drive relays. However, as a larger number of sets, the above-described temperature difference is once in operation with a decrease after becoming a predetermined value or more. You may make it stop a part of cooling fan in steps. Thereby, the temperature stress to the switching element can be further reduced.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described.

  FIG. 11 is a diagram illustrating a configuration example in which the power conversion unit of the elevator control device according to the sixth embodiment of the present invention is specially described.

  In this embodiment, as compared with the fifth embodiment, a temperature difference recording device 28 is further provided. Further, unlike the fifth embodiment, the elevator control microcomputer 6 includes a replacement necessity determination unit 6e and a notification unit 6f. Further, unlike the fifth embodiment, the temperature calculation device 26 and the fan drive circuit 27 are not directly connected.

  The temperature difference recording device 28 is provided between the temperature calculation device 26 and the elevator control microcomputer 6, and the temperature detected by the switching element temperature detector 24 and the external temperature detector 25 as a calculation result by the temperature calculation device 26. The number of times that the difference from the detected temperature exceeds the predetermined value that can be regarded as one heat cycle for the switching element is recorded.

  A replacement necessity determination unit 6 e of the elevator control microcomputer 6 determines whether or not the switching element of the inverter device 4 needs to be replaced based on the number of times recorded by the temperature difference recording device 28. When the replacement necessity determination unit 6e determines that the switching element needs to be replaced, the notification unit 6f issues an abnormality to a predetermined location indicating that the replacement is required.

  The predetermined place of the report destination may be a place where the present apparatus is installed, that is, a machine room, a building management room, or an external remote monitoring center via a communication network. In short, any location that can be immediately confirmed by an administrator or maintenance personnel may be used. In addition to outputting a warning sound through a speaker or outputting a warning message as a warning method, the warning message may be displayed through a display.

  FIG. 12 is a flowchart illustrating an example of a processing operation for cooling the inverter device of the elevator control device according to the sixth embodiment of the present invention.

  When the elevator control microcomputer 6 determines that the elevator is activated (step S1), the elevator control microcomputer 6 causes the gate drive circuit 10 to start energization of the inverter device 4, and the fan drive circuit 27 determines this determination. In conjunction with this, the fan drive relays 8A and 8B are turned on (step S60). As a result, the cooling fans 9A and 9B are driven by the fan drive power supply 7 (step S61), and the operation is performed while cooling the heat generated in the switching elements of the inverter device 4 by energization.

  When the operation of the elevator is stopped (step S62), the elevator control microcomputer 6 calculates the difference between the temperature detected by the switching element temperature detector 24 and the temperature detected by the external temperature detector 25 with respect to the temperature calculation device 26. Instruct.

  Then, the temperature calculation device 26 acquires the temperature detected by the switching element temperature detector 24 and the temperature detected by the external temperature detector 25 (steps S63 and S64), calculates the difference between the two, and the calculation result Is output to the temperature difference recording device 28.

  When the difference that is the calculation result of the temperature calculation device 26 exceeds the predetermined value that can be considered that one heat cycle has occurred to the switching element (YES in step S65), the temperature difference recording device 28 generates the switching element. The updated value by incrementing the number of times of the heat cycle is recorded in the internal memory, and the recorded value is output to the elevator control microcomputer 6 (step S66).

  If the difference that is the calculation result of the temperature calculation device 26 does not exceed the above-described predetermined value (NO in step S65), the process returns to step S1.

  If the number of heat cycles from the temperature difference recording device 28 is equal to or greater than a predetermined value that can be regarded as the heat cycle life of the switching element of the inverter device 4 (step S67). YES), it is determined that the switching element of the inverter device 4 needs to be replaced.

  In this case, the reporting unit 6f of the elevator control microcomputer 6 issues an abnormal report to a predetermined location indicating that the switching element of the inverter device 4 needs to be replaced (step S68).

  If the number of heat cycles from the temperature difference recording device 28 is not equal to or greater than the predetermined value described above (NO in step S67), the process returns to step S1.

  As described above, in the elevator control device according to the sixth embodiment of the present invention, the difference between the temperature of the switching element and the external temperature from when the cooling fan is started to when it is stopped is a single heat to the switching element. Record the number of times exceeding a predetermined value that can be regarded as having occurred, and when this number exceeds the predetermined number, it is determined that the switching element has a heat cycle life, and a predetermined value indicating that the switching element needs to be replaced Since the abnormality is reported to the place, the switching element mounted on the inverter device 4 can be replaced by maintenance personnel before breakage.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described.

  FIG. 13 is a diagram illustrating a configuration example in which the power conversion unit of the elevator control device according to the seventh embodiment of the present invention is specially described.

  This embodiment further includes a stop count recording device 29 as compared with the fifth embodiment. Unlike the fifth embodiment, the elevator control microcomputer 6 includes a start / stop determination unit 6a, a replacement necessity determination unit 6e, and a notification unit 6f. Unlike the fifth embodiment, the switching element temperature detector 24, the external temperature detector 25, and the temperature calculation device 26 are not provided.

  The stop count recording device 29 is provided between the fan drive circuit 27 and the elevator control microcomputer 6, and when the fan drive circuit 27 turns off the fan drive relays 8A and 8B, the cooling fan 9A and 9B The updated value by increasing the number of stops by 1 is recorded in the internal memory.

  FIG. 14 is a flowchart illustrating an example of a processing operation for cooling the inverter device of the elevator control device according to the seventh embodiment of the present invention.

  When the start / stop determination unit 6a of the elevator control microcomputer 6 determines that the elevator has started (step S1), the elevator control microcomputer 6 causes the gate drive circuit 10 to start energizing the inverter device 4 to drive the fan. In conjunction with this determination, the circuit 27 turns on the fan drive relays 8A and 8B (step S70). As a result, the cooling fans 9A and 9B are driven by the fan drive power supply 7 (step S72), and the operation is performed while cooling the heat generated in the switching elements of the inverter device 4 due to energization.

  When the start / stop determination unit 6a of the elevator control microcomputer 6 determines that the elevator operation has stopped (step S73), the fan drive circuit 27 turns off the fan drive relays 8A and 8B in conjunction with this determination. (Step S73), both the cooling fans 9A and 9B are stopped (Step S74), and the switching elements mounted on the inverter device 4 are naturally cooled by air.

  The fan drive circuit 27 outputs a notification signal indicating that the fan drive relays 8 </ b> A and 8 </ b> B are turned off to the stop count recording device 29. When the notification signal from the fan drive circuit 27 is input, the stop count recording device 29 increases the stop count of the cooling fans 9A and 9B by 1 and records the updated value in the internal memory, and this recorded value is used for elevator control. It outputs to the microcomputer 6 (step S75).

  When the number of stops from the stop number recording device 29 is equal to or greater than a predetermined number that can be regarded as the heat cycle life of the switching element (YES in step S76), the replacement necessity determining unit 6e of the elevator control microcomputer 6 It is determined that the switching element of the device 4 needs to be replaced.

  In this case, the reporting unit 6f of the elevator control microcomputer 6 issues an abnormal report to a predetermined location indicating that the switching element of the inverter device 4 needs to be replaced (step S77).

  If the number of stops from the stop count recording device 29 is not equal to or greater than the predetermined number of times described above (NO in step S76), the process returns to step S1.

  As described above, in the elevator control device according to the seventh embodiment of the present invention, the number of cooling fan stops is recorded, and the recorded number of stops reaches a predetermined value that can be regarded as the heat cycle life of the switching element. Therefore, the maintenance element can replace the switching element mounted on the inverter device 4 before it is damaged.

(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described.

  FIG. 15 is a diagram illustrating a configuration example in which the power conversion unit of the elevator control device according to the eighth embodiment of the present invention is specially described.

  In this embodiment, as compared with the fifth embodiment, the external temperature detector 25 is not provided, but a temperature determination device 30 is provided instead of the temperature calculation device 26.

  The temperature determination device 30 is provided between the switching element temperature detector 24, the fan drive circuit 27, and the elevator control microcomputer 6, and determines the temperature detected by the switching element temperature detector 24 when the elevator is started.

  FIG. 16 is a flowchart illustrating an example of a processing operation for cooling the inverter device of the elevator control device according to the eighth embodiment of the present invention.

  When the elevator control microcomputer 6 determines that the elevator is activated (step S1), the elevator control microcomputer 6 causes the gate drive circuit 10 to start energization of the inverter device 4, and the fan drive circuit 27 determines this determination. In conjunction with this, the fan drive relays 8A and 8B are turned on (step S80). As a result, the cooling fans 9A and 9B are driven by the fan drive power supply 7 (step S81), and the operation is performed while cooling the heat generated in the switching device of the inverter device 4 by energization.

  The fan drive circuit 27 outputs a notification signal indicating that the fan drive relays 8 </ b> A and 8 </ b> B are turned on to the temperature determination device 30. When the notification signal from the fan drive circuit 27 is input, the temperature determination device 30 determines the temperature detected by the switching element temperature detector 24 and continuously outputs the determined temperature value to the elevator control microcomputer 6 ( Step S82).

  When the temperature value from the temperature determination device 30 is equal to or greater than the predetermined value A (YES in step S83), the elevator control microcomputer 6 is a fan drive relay even when the operation of the elevator is stopped (YES in step S84). 8A and 8B are maintained in the ON state. As a result, the cooling fans 9A and 9B are continuously driven by the fan drive power source 7. As a result, temperature stress on the switching element at high temperature is reduced.

  And the microcomputer 6 for elevator control inputs again the temperature value from the temperature determination apparatus 30 (step S85), and when this temperature value is below the predetermined value B lower than the predetermined value A (YES of step S86). The fan drive circuit 27 is instructed to turn off the fan drive relays 8A and 8B.

  When the fan drive circuit 27 inputs an instruction from the elevator control microcomputer 6, the fan drive relays 8A and 8B are turned off (step S87), whereby both the cooling fans 9A and 9B are stopped (step S88). ), Natural air cooling of the switching elements mounted on the inverter device 4 is performed.

  As described above, in the elevator control device according to the eighth embodiment of the present invention, when the temperature of the switching element after the elevator starts becomes equal to or higher than the first predetermined value, the cooling fan is driven even if the elevator stops. Then, the switching element is continuously cooled and cooled until the temperature of the switching element becomes equal to or lower than the second temperature value lower than the first temperature value, and then the cooling fan is stopped. As a result, since the cooling fan continues to drive for a while after the elevator stops, it is possible to reduce the temperature stress on the switching element at a high temperature, and it is mounted on the inverter device after the cooling fan stops. Cooling is performed by natural air cooling of the switching element, and it is possible to prevent sudden temperature stress from being applied to the switching element as in the first embodiment.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be omitted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

DESCRIPTION OF SYMBOLS 1 ... Three-phase alternating current power supply 2 ... Converter apparatus 3 ... Smoothing capacitor 4 ... Inverter apparatus 5 ... Elevator drive motor 6 ... Elevator control microcomputer 6a ... Start / stop determination part 6b ... Relay control part 6c ... Call existence determination part 6d ... Power supply control unit 6e ... Replacement necessity determination unit 6f ... Notification unit 7 ... Fan drive power supply 8 ... Fan drive relay 9 ... Cooling fan 10 ... Gate drive circuit 11 ... Sheave 12 ... Main rope 13 ... Car 14 ... Counterweight DESCRIPTION OF SYMBOLS 21 ... Gate voltage monitoring circuit 22 ... Hall call button 23 ... Car destination floor button 24 ... Switching element temperature detector 25 ... External temperature detector 26 ... Temperature calculating device 27 ... Fan drive circuit 28 ... Temperature difference recording device 29 ... Stop Circuit recording device 30 ... temperature determination device

Claims (1)

A rectifier circuit that converts AC power from an AC power source into DC power;
A smoothing capacitor for smoothing pulsation of DC power converted by the rectifier circuit;
An inverter device including a switching element for converting the smoothed DC power into AC power of variable voltage and variable frequency and outputting the AC power;
An electric motor driven by the AC power output from the inverter device;
When the operation of the inverter device is stopped, the difference between the temperature near the switching element of the inverter device and the temperature outside the inverter device is equal to or less than a predetermined value, and before the operation of the inverter device is started. In addition, when a current is gradually supplied to a predetermined phase of the electric motor and a difference between the temperature near the switching element of the inverter device and the temperature outside the inverter device exceeds the predetermined value, An elevator control apparatus comprising: an energization control unit that does not energize a predetermined phase.

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