JP7182574B2 - Elevator control device and elevator control method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an elevator control device and an elevator control method, and is suitable for, for example, an elevator system equipped with a heat pipe type cooling device.

In recent years, with the increase in installation locations and usage frequency of general elevators, it is necessary to extend the life of electrical components provided in elevators. For example, as elevators are repeatedly driven and stopped, the life of semiconductor elements in electric power converters tends to be shortened, so there is a demand for a technique for preventing deterioration of these semiconductor elements.

In Patent Document 1, temperature ripple is suppressed in a semiconductor element of a power conversion device used in a drive circuit for a load that repeatedly stops driving or a load whose amount of load changes suddenly, thereby extending the life of the semiconductor element. A power supply is disclosed.

JP 2010-246246 A

2. Description of the Related Art A heat pipe type cooler is generally known to mitigate temperature changes in semiconductor elements in a power converter. However, in the heat pipe cooler, it takes a certain amount of time for the cooling liquid mixed in the heat pipe to evaporate and exhibit its cooling performance. Therefore, when the technique of Patent Document 1 is applied, for example, when an elevator is stopped for a certain period of time and then starts to operate, the temperature change of the semiconductor element becomes large, and the life of the semiconductor element is shortened. Such a phenomenon appears conspicuously at the time when the elevator is not used much or when the time when the elevator starts to be used frequently.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and proposes to extend the life of a semiconductor element in an inverter for controlling an elevator.

In order to solve such problems, in the present invention, an elevator control device is an elevator control device that is connected to an inverter that supplies AC power to a motor to operate the elevator, and that controls the operation of the elevator by controlling the inverter. The inverter has a semiconductor element for converting DC power into the AC power, and the inverter is thermally coupled with a cooler for cooling the semiconductor element. The performance varies according to the temperature of the semiconductor device, and the elevator controller sends a command to the inverter to supply power to the semiconductor device when the cooler reaches a first temperature while the elevator is stopped. is characterized.

Further, in the present invention, there is provided an elevator control method for controlling the operation of the elevator by controlling an inverter that supplies AC power to a motor using a semiconductor device to operate the elevator, wherein the inverter includes: A cooler is mounted that is thermally coupled with the semiconductor device to cool the inverter, a first step of determining whether the elevator is stopped, and the temperature of the cooler is a first temperature. , a second step of supplying power to the semiconductor element by the inverter.

According to the present invention, it is possible to extend the life of a semiconductor element in an inverter that controls an elevator.

1 is a schematic configuration diagram of an elevator according to a first embodiment of the present invention; FIG. It is a schematic structure of the cooler of a heat pipe. 4 is a flow chart in the first embodiment; 4 is a graph of temperature changes of the semiconductor and the cooler in the first embodiment; It is a flow chart in the second embodiment. It is a graph of the temperature change of the semiconductor and cooler in the second embodiment. It is a flow chart in a 3rd embodiment. It is a graph of the temperature change of the semiconductor and cooler in the third embodiment. It is Example 1 of the flowchart in the fourth embodiment. It is Example 2 of the flowchart in the fourth embodiment.

The drawings related to one embodiment of the present invention will be described in detail below.

(Configuration and processing of elevator control device)
FIG. 1 is a schematic configuration diagram of the entire elevator including an elevator control device according to one embodiment of the present invention.

The elevator control device of the present embodiment will be described together with the general configuration of the elevator. Power conversion device 113 converts R, S, and T-phase three-phase AC power output from constant-frequency three-phase AC power supply 101 into DC power by converter 102 provided therein. After this DC power is smoothed by a smoothing capacitor 103 , it is converted into three-phase AC power of variable frequency U, V, and W phases by an inverter (IGBT) 104 and supplied to a motor 106 . A motor 106 supplied with power from a power conversion device 113 rotates a sheave 107 to raise and lower a car 109 suspended by a main rope 108 and a counterweight 110 to operate the elevator.

It should be noted that the IGBT, which is a semiconductor element that the inverter 104 has, may be in the form of any type of switching element such as 1-in-1, 2-in-1, 6-in-1, and 7-in-1. Alternatively, the converter 102 and the inverter 104 may be configured to use the same IGBT.

The elevator control device 111 is configured using, for example, an MPU (Micro Processing Unit), and includes an elevator control section and an inverter control section as functions realized by the MPU executing a predetermined program. When there is a call to the elevator from an arbitrary floor or car 109, that is, when there is a command to raise or lower the elevator car 109, the elevator control unit receives the command and drives the inverter 104. Sends a command to the inverter control unit. Upon receiving a command from the elevator control unit, the inverter control unit sends an energization command 112 to the inverter 104, whereby the inverter 104 supplies electric power to the IGBT, which is a semiconductor device, to drive the motor 106 and sheave 107. It controls the car 109 . Note that the brake 105 is constantly braking the motor 106 when there is no call to the elevator, and releases the brake when there is a call to the elevator. As a result, the motor 106 is activated to move the car 109 up and down.

FIG. 2 is a schematic configuration of a heat pipe cooler (hereinafter referred to as cooler). (a) is a front view of a cooler, (b) is a side view. Note that the cooler is provided in the power converter 113 to cool the inverter 104 .

The cooler is attached to the inverter 104 and comprises a heat conducting member 114 , a heat pipe 116 , cooling fins 115 and a temperature detector 117 . Heat pipe 116 is thermally coupled to inverter 104 via heat conducting member 114 , and moves the heat of inverter 104 to cooling fin 115 by evaporating the working fluid mixed therein. The cooling fins 115 dissipate heat from the heat pipes 116 to lower the temperature of the heat pipes 116 that has risen due to the heat of the inverter 104 and liquefy the vaporized working fluid in the heat pipes 116 again. Thereby, the heat of the IGBT generated according to the operation of the inverter 104 can be dissipated by the cooling fins 115 via the heat pipe 116 to cool the inverter 104 .

The inverter 104 drives the IGBT by receiving a drive command from the inverter control unit of the elevator control device 111, thereby increasing the temperature of the IGBT. Then, the temperature of the heat conducting member 114, the cooling fins 115, and the heat pipe 116 also rises in synchronism, the vaporization of the working fluid in the heat pipe 116 progresses, and the heat radiation amount of the cooler increases. In other words, the cooling performance of the cooler that is thermally coupled to inverter 104 to cool the semiconductor elements of inverter 104 varies according to the temperature of the semiconductor elements. Note that the temperature detector 117 detects the temperature of the heat pipe 116, and can similarly detect the temperature of the synchronized IGBT and the temperature of the entire cooler.

The working fluid in the heat pipe 116 vaporizes as the temperature of the IGBT rises and moves to the upper part of the cooler. The vaporized working fluid in the heat pipe 116 needs to be liquefied again in order to return to a high cooling performance state. Therefore, the cooling fins 115 are installed on the upper part of the cooler, which is in the moving direction of the working fluid after vaporization, to promote the heat dissipation of the heat pipes 116 and to reduce the temperature of the entire cooler. In this way, when the temperature of the IGBTs in the inverter 104 is above a certain value due to the switching operation of the inverter 104, the working fluid in the heat pipe 116 is vaporized, so that the cooling performance of the cooler is sufficiently improved. demonstrated.

On the other hand, when the elevator is not called, the inverter 104 is not driven, so the IGBT temperature does not rise. If this state continues for a certain period of time or more, the working fluid in heat pipe 116 does not evaporate and is kept in a liquefied state. It takes time to evaporate and reach the full cooling performance of the cooler.

Therefore, in the present invention, the power supply to the inverter 104 is controlled by the elevator control device 111 so that the cooling performance of the cooler can be fully exhibited even when the elevator is not called. Specific methods thereof will be described below in each of the first to fourth embodiments. In addition, in each of the following embodiments, the configuration of the elevator system including the elevator control device 111 is common.

(Processing of the elevator control device according to the first embodiment)
FIG. 3 is a flow chart of the elevator control device 111 in the first embodiment. In this embodiment, an example will be described in which the temperature of the heat pipe is determined and power is supplied while the car is stopped.

In step S1, the elevator control unit determines whether the elevator car 109 is stopped. If the car 109 is stopped, the process proceeds to step S2, otherwise the flow chart ends.

In step S2, the temperature of the heat pipe (cooler) 116 detected by the temperature detector 117 exceeds the temperature (hereinafter referred to as T° C.) at which the cooling performance of the cooler is sufficiently exhibited, that is, the heat pipe 116 is above a first temperature required for cooling performance. If the temperature of the heat pipe 116 exceeds T° C., the process proceeds to step S3; otherwise, the flow chart ends.

In step S3, it is determined whether the temperature of the heat pipe 116 detected by the temperature detector 117 is T°C. If the temperature of the heat pipe 116 determined to exceed T° C. in step S2 has decreased to T° C., the process proceeds to step S4. Wait until the temperature drops to T°C.

In step S4, the inverter control unit outputs an energization command 112 so that power is supplied to the IGBTs of the inverter 104 for a preset time t1 seconds. Here, if the temperature of the heat pipe 116 becomes T° C. or lower, the cooler cannot exhibit the intended cooling performance. Therefore, the elevator control unit receives the content detected by the temperature detector 117 in step S3, that is, the temperature of the heat pipe 116 is T° C., and sends a power supply command 112 to the inverter 104 to the inverter control unit. . Upon receiving this command, the inverter control unit outputs an energization command 112 to the inverter 104 to cause the inverter 104 to supply power to the IGBTs. In other words, the inverter controller sends a command to supply power to the semiconductor device to the inverter 104 when the cooler reaches the first temperature (T° C.) while the elevator is stopped. The inverter 104 supplies power to the IGBT for a predetermined time t1 seconds in response to the energization command 112 from the inverter control unit, and proceeds to step S5. By supplying power for a predetermined time of t1 seconds in this way, it is possible to prevent excessive power from being supplied to the IGBT.

It should be noted that the temperature as the threshold value for power supply to the IGBT used in the determination in step S3 may be any temperature at which the cooler can sufficiently exhibit its cooling performance, and is set to a temperature of T° C. or higher. Also good. Further, the predetermined time t1 seconds for supplying power to the IGBTs of the inverter 104 in step S4 is, for example, a value such as 0 seconds<t1 seconds<10 seconds, and can be set without being limited thereto. However, if the value of t1 is set to an excessively large value (for example, 6000), the temperature of the IGBT, which is a semiconductor element, will continue to rise and the life will be shortened. is preferred. In addition, the pattern of IGBT temperature rise changes depending on the characteristics of each elevator, such as the load capacity and lifting speed of the car 109, the rated capacity of the IGBT used in the inverter 104, the performance of the cooler, and so on. It is preferable to change the setting value according to the characteristics of each elevator.

In step S5, it is determined whether or not there is a call to the elevator. If there is a call for the car 109, the process proceeds to step S6, the elevator is operated according to the call, and the process returns to step S1 to repeat the flow chart. Otherwise, the process returns to step S3 to determine again whether the temperature of the heat pipe 116 has reached T°C. As a result, the temperature of the heat pipe 116 does not fall below T° C. while the car 109 is stopped, and the cooler can maintain the intended cooling performance, so that the state of no call to the elevator is constant. Even if the inverter 104 is operated after the above operation continues, the temperature of the IGBT, which is a semiconductor element, is maintained at a constant temperature, and the temperature change is reduced. Therefore, it is possible to extend the life of the semiconductor device.

FIG. 4 is an example of a graph of temperature changes of the semiconductor element and the cooler in the first embodiment.

As shown in FIG. 4, in the busy period when the elevator operation frequency is equal to or higher than a predetermined reference value and the elevator continues to operate continuously, the semiconductor element temperature 118 rises with time, and the heat pipe temperature 119 rises as the semiconductor element temperature 118 rises. As a result, the IGBT, which is a semiconductor element, is cooled to lower the temperature. On the other hand, when the operating frequency of the elevator is less than a predetermined reference value, for example, when the elevator is stopped more frequently than the operating frequency, power is not supplied to the IGBT, which is a semiconductor element. , the heat pipe temperature 119 continues to drop to T° C. or lower, and the cooling performance cannot be exhibited. Therefore, power is intermittently supplied to the IGBTs for t1 seconds so as to maintain the heat pipe temperature 119 at T° C. or above and near T° C. In other words, power supply and stop to the IGBTs are repeated. Configure. As a result, the IGBT, which is a semiconductor element, does not undergo a large temperature change and can extend its life.

Further, in the first embodiment, when the energization command 112 is sent from the inverter control unit to the inverter 104 and the inverter 104 supplies power to the IGBT to drive it, the brake 105 is erroneously supplied with power, causing the brake to stop. There is a possibility that it will be released and cause the elevator to operate unnecessarily. Therefore, when the inverter control unit issues the energization command 112 to the inverter 104, it does not issue a command to apply power for opening the brake 105 so that power is not supplied to the brake 105 of the elevator. As a result, when power is supplied to the semiconductor device, only the cooling performance of the cooler fluctuates according to the temperature of the semiconductor device, and malfunction of the elevator can be prevented.

According to the first embodiment of the present invention described above, the following effects are obtained.

(1) The elevator control device 111 is connected to the inverter 104 that supplies AC power to the motor 106 to operate the elevator, and controls the operation of the elevator by controlling the inverter 104. The inverter 104 has a semiconductor device that converts DC power into AC power, and a cooler for cooling the semiconductor device is thermally coupled to the inverter 104, and the cooling performance of the cooler is , varies according to the temperature of the semiconductor device, and the elevator controller 111 sends a command to the inverter 104 to supply power to the semiconductor device when the cooler reaches the first temperature while the elevator is stopped. characterized by With this configuration, the life of the semiconductor device can be extended by maintaining the cooling performance of the cooler in the inverter that controls the elevator.

(2) The elevator control device 111 is characterized in that when power is supplied to the semiconductor device for a predetermined period of time, the inverter control unit stops issuing commands. With this configuration, it is possible to prevent a large temperature change in the semiconductor element, so that it is possible to extend the life of the semiconductor element.

(3) The elevator control device 111 is characterized in that, when the inverter control unit issues a command, it does not issue a command to supply electric power for releasing the brake 105 of the elevator. Since it did in this way, supply of wasteful electric power can be prevented and power saving can be achieved.

(4) The elevator control device 111 has an elevator control method for controlling the operation of the elevator by controlling the inverter 104 that supplies AC power to the motor 106 using a semiconductor device to operate the elevator, In the control method, the inverter 104 is equipped with a cooler that is thermally coupled to the semiconductor element to cool the inverter 104, and the first step of determining whether the elevator is stopped; and a second step of supplying power to the semiconductor device by means of an inverter when the temperature of is the first temperature. Since this is done, it is possible to realize a control method for preventing the temperature ripple of the semiconductor element regardless of the operating state of the elevator and extending the life of the semiconductor element.

(Processing of the elevator control device according to the second embodiment)
FIG. 5 is a flow chart of processing of the elevator control device according to the second embodiment.

In step S1A, the elevator control unit determines whether the elevator car 109 is stopped. If the car 109 is stopped, the process proceeds to step S2A, otherwise the flow chart ends.

In step S2A, the elevator control unit determines whether or not the elevator car 109 is stopped for less than a predetermined time (hereinafter referred to as t2 time). If the car 109 is stopped for less than t2, the process proceeds to step S3A. Otherwise, end the flowchart. By doing this, if there is no call to the elevator for a certain period of time or more in a row, for example, in a situation where the elevator does not operate for several hours during the off-peak period, such as late at night, the semiconductor repeatedly You can stop supplying current. Therefore, it is possible to prevent unnecessary power supply to the IGBTs during a time period when the elevator operation is extremely low. Note that the predetermined time t2 is a value set by, for example, 1 [time]<t2.

Steps S3A to S6A are the same flowchart as steps S2 to S5 in the first embodiment. However, it is different from the first embodiment in that if there is no elevator call in step S6A, the process returns to step S2A to determine the stop time of the elevator car 109.

The second embodiment can be applied, for example, in a state in which there is no call to the elevator during off-peak periods, as compared to busy periods, such as when employees are commuting to and from work or during lunch break, during which time the elevators are used intensively. Also, for example, at a rural station with a small population, the difference in elevator operating time between busy season and off-peak season is remarkable. It can be similarly applied to a case where there is time not to do so.

FIG. 6 is an example of a graph of temperature changes of the semiconductor and cooler in the second embodiment.

As shown in FIG. 6, when the heat pipe temperature 119 is kept above T° C. and near T° C. in the off season for more than time t2, the power supply to the IGBT is stopped, so the temperature gradually drops thereafter. to return to normal part temperature. In summary, when the elevator does not operate for a certain period of time or more, the inverter control unit stops the energization command 112, thereby suppressing power consumption during off-seasons such as nighttime.

According to the second embodiment of the present invention described above, the following effects are obtained.

(5) The elevator control device 111 is characterized in that the inverter control unit stops issuing commands when the elevator does not operate for a predetermined time or more. As a result, when the refrigerator does not move for a long period of time, such as during the nighttime, power is not supplied to maintain the intended function of the cooler, and wasteful power consumption can be suppressed.

(Processing of the elevator control device according to the third embodiment)
FIG. 7 is a flow chart of processing of the elevator control device according to the third embodiment. In this embodiment, information about the operating status of the elevator is stored in advance in the elevator control device 111, and the result of determining the current operating status of the elevator based on this information is used to control the energization of the inverter 104. I will explain an example. This information may be set in advance when the elevator control device 111 is manufactured or installed, or may be set by the elevator control device 111 itself based on the past operation history of the elevator.

In step S1B, it is determined whether or not the current operating status of the elevator is the above-described off-season. If it is the off-season, the process proceeds to step S2B, otherwise the flowchart ends. The determination in step S1B may be performed based on the above information stored in advance in the elevator control device 111, or may be performed in the same manner as in step S2A described above.

In step S2B, based on the information previously stored in the elevator control device 111, it is determined whether or not the current elevator situation is a predetermined time (hereinafter referred to as m minutes) before the shift from the off season to the busy season. . If the state of the elevator is m minutes before shifting to the busy season, the process proceeds to step S3B. Otherwise, the processing of step S2B is repeated to wait m minutes before shifting to the busy season.

In step S3B, the inverter control unit repeats the operation of supplying power to the IGBTs of the inverter 104 for a predetermined time (hereinafter referred to as t3 seconds) and stopping the power supply for a predetermined time (hereinafter referred to as t4 seconds). , and outputs the energization command 112 . As a result, it becomes possible to gradually raise the temperature of the semiconductor element in the process of shifting to the busy season, and it is possible to prevent deterioration of the semiconductor element due to sudden temperature changes. By continuing this operation, the semiconductor element is maintained at T° C. or higher before the shift to the busy season, and the process proceeds to step S4B.

Steps S4B to S6B are the same as the processing flow from steps S3 to S5 of the first embodiment. However, if the temperature of the heat pipe 116 is not T° C. in step S4B, the operation of repeatedly supplying and stopping power to the IGBT is performed in step S3B, unlike the first embodiment.

FIG. 8 is an example of a graph of temperature changes of the semiconductor and cooler in the third embodiment.

As shown in FIG. 8, power is supplied to the semiconductor devices from m minutes before the end of the off-season based on the data on the operating time pre-stored in the elevator control device 111 . As described above, the semiconductor element temperature 118 gradually rises due to the power supply at time t3 and the power supply stop at time t4. Able to maintain temperature. That is, the elevator control device 111, which has a storage device that stores the time period during which the elevator operates, starts the inverter control unit from a certain period of time before the time when the operating frequency becomes high, based on the stored time period data. The operation of sending the energization command 112 to the inverter 104 and stopping the energization command 112 after a certain period of time is repeated. As a result, the temperature of the heat pipe 116 can be efficiently raised, the heat pipe 116 can be maintained at the cooling activation temperature during the busy season, and a large temperature change in the semiconductor element can be mitigated, thereby reducing the temperature of the semiconductor element. It is possible to realize a long service life.

According to the third embodiment of the present invention described above, the following effects are obtained.

(6) The elevator control device 111 stores information about the operating status of the elevator. is characterized by repeating the transmission and stop of the command. By doing so, by supplying power to the semiconductor element in advance at the timing of transition from the off season to the busy season, it is possible to prevent a large temperature change and extend the life of the semiconductor element.

(Processing of the elevator control device according to the fourth embodiment)
FIG. 9 is Example 1 of a flowchart of processing of the elevator control device according to the fourth embodiment.

In the fourth embodiment, the temperature rise coefficient of the semiconductor element is used for determination. The temperature rise coefficient of the semiconductor element used here is the temperature rise value of the IGBT of the inverter 104 in a predetermined unit time (for example, one second), and is calculated based on the temperature detected by the temperature detector 117 . This may be the temperature rise coefficient of the synchronized heat pipes 116 . The flowchart of FIG. 9, which is Example 1, is similar to the flowchart of the first embodiment, and step S4 in the flowchart of the first embodiment of FIG. 3 is changed from S4C to S6C in the fourth embodiment. ing. Other processes of the fourth embodiment are the same as those of the first embodiment.

Steps S4C to S6C will be described. In step 4C, since it is determined in step S3C that the temperature of heat pipe 116 is T° C., power supply to the semiconductor element is started in order not to lower the temperature of heat pipe 116 any further, and the process proceeds to step S5C. . Here, the time for supplying power is not provided.

In step S5C, it is determined whether or not the temperature rise coefficient of the semiconductor element is equal to or greater than a predetermined value (hereinafter referred to as T1). If the temperature rise coefficient of the semiconductor element is equal to or higher than T1, the process proceeds to step S6C and stops the power supply to the IGBT. Otherwise, the process returns to step S4C. In the inverter 104, the temperature rise value of the semiconductor element within a certain period of time may change depending on the individual difference of the IGBTs and the current value supplied to the IGBTs. Considering such a case, the method of fixing the power supply time to the inverter 104 as described in the first embodiment cannot stably prevent deterioration of the semiconductor element due to a large temperature change. Therefore, in the present embodiment, by determining the degree of temperature rise of the semiconductor element in step S5C, it is possible to prevent a large temperature change of the semiconductor element regardless of the characteristics of the part, and to realize a long life of the semiconductor element. I have to.

In addition, the temperature decrease coefficient can also be used for the determination as well as the temperature increase coefficient. Note that the temperature drop coefficient is the temperature drop value of the IGBT of the inverter 104 in a predetermined unit time (for example, one second), and is calculated based on the temperature detected by the temperature detector 117 . When the power supply to the IGBT is stopped, the temperature of the semiconductor element drops from a certain temperature, but if the temperature drop coefficient of the semiconductor element is a predetermined value or more, the temperature detector 117 senses this, Power supply to the semiconductor element is restarted, and the temperature of the semiconductor element is maintained above T°C and near T°C. As a result, it is possible to prevent the temperature of the semiconductor element from suddenly changing, thereby preventing deterioration of the semiconductor element.

Further, the temperature rise coefficient and temperature fall coefficient of the semiconductor element can also be applied to the flow chart of transition from the off season to the busy season described in the third embodiment. FIG. 10 shows Example 2 of the fourth embodiment, which is similar to the third embodiment described in FIG.

There are two points in which the fourth embodiment shown in FIG. 10 differs from the third embodiment shown in FIG. One is that in step S3B of the third embodiment, the power supply to the IGBT is started and stopped in step S3D in the fourth embodiment. Another is that in step S5B of the third embodiment, if the temperature rise coefficient of the semiconductor element is equal to or higher than T1 in step S5D in the fourth embodiment, power supply to the IGBT is stopped in step S6D. Otherwise, the process returns to step S5D. Other than that, the processing flow of the fourth embodiment is the same as that of the third embodiment.

According to the processing flow of the fourth embodiment, the storage device has temperature data of the semiconductor element that can be detected and measured by the temperature detector 117, and based on the temperature data, the temperature rise coefficient of the cooler is equal to or greater than a predetermined coefficient. When the temperature detector 117 detects this, the inverter controller stops the energization command 112 . Further, when the temperature detector 117 detects that the temperature decrease coefficient of the semiconductor element has exceeded a predetermined value, the inverter control section can issue an energization command 112 .

According to the fourth embodiment of the present invention described above, the following effects are obtained.

(7) The elevator control device 111 is characterized in that the inverter control unit stops issuing commands when the temperature rise coefficient of the cooler becomes equal to or greater than a predetermined coefficient. Since this is done, it is possible to prevent a large temperature change in the semiconductor element when supplying power to the inverter 104 according to the characteristics that differ from elevator to elevator.

(8) The elevator control device 111 is characterized in that the inverter control section issues a command when the temperature decrease coefficient of the semiconductor element becomes equal to or greater than a predetermined coefficient. Since this is done, it is possible to prevent a large temperature change of the semiconductor element in any time zone according to the characteristics that differ from elevator to elevator.

As described above, each embodiment and various modifications are merely examples, and the present invention is not limited to these contents as long as the features of the invention are not impaired. Other aspects conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

101 AC power supply 102 Converter 103 Smoothing capacitor 104 Inverter 105 Brake 106 Motor 107 Sheave 108 Main rope 109 Car 110 Counterweight 111 Elevator control Device (MPU) 112 Energization command 113 Power converter 114 Thermal conduction member 115 Cooling fin 116 Heat pipe 117 Temperature detector 118 Semiconductor element temperature 119 Heat pipe temperature

Claims (9)

An elevator control device comprising an inverter control unit that is connected to an inverter that supplies AC power to a motor to operate an elevator, and that controls the operation of the elevator by controlling the inverter,
The inverter has a semiconductor element that converts DC power to AC power,
a cooler for cooling the semiconductor element is thermally coupled to and attached to the inverter;
The cooling performance of the cooler varies according to the temperature of the semiconductor element,
When the cooler reaches a first temperature while the elevator is stopped, the elevator control device sends a command to the inverter to supply power to the semiconductor device,
Further, the elevator control device stores information about the operation status of the elevator, and based on the information, starts the inverter from before the start time of the busy season when the operation frequency of the elevator is equal to or higher than a predetermined reference value. An elevator control device characterized by repeating the transmission of the command to and the stop . An elevator control device comprising an inverter control unit that is connected to an inverter that supplies AC power to a motor to operate an elevator, and that controls the operation of the elevator by controlling the inverter,
The inverter has a semiconductor element that converts DC power to AC power,
a cooler for cooling the semiconductor element is thermally coupled to and attached to the inverter;
The cooling performance of the cooler varies according to the temperature of the semiconductor element,
When the cooler reaches a first temperature while the elevator is stopped, the elevator control device sends a command to the inverter to supply power to the semiconductor device,
When the temperature rise coefficient of the semiconductor element becomes equal to or greater than a predetermined coefficient, the inverter control section stops the command.
Elevator controller. An elevator control device comprising an inverter control unit that is connected to an inverter that supplies AC power to a motor to operate an elevator, and that controls the operation of the elevator by controlling the inverter,
The inverter has a semiconductor element that converts DC power to AC power,
a cooler for cooling the semiconductor element is thermally coupled to and attached to the inverter;
The cooling performance of the cooler varies according to the temperature of the semiconductor element,
When the cooler reaches a first temperature while the elevator is stopped, the elevator control device sends a command to the inverter to supply power to the semiconductor device,
When the temperature decrease coefficient of the semiconductor element becomes equal to or greater than a predetermined coefficient, the inverter control unit issues the command.
Elevator controller. In the elevator control device according to any one of claims 1 to 3 ,
The elevator control device according to claim 1, wherein the inverter control unit stops the command when the inverter supplies power to the semiconductor device for a predetermined time. In the elevator control device according to any one of claims 1 to 3 ,
The elevator control device, wherein the inverter control unit stops the command when the elevator does not operate for a predetermined time. 4. The elevator control device according to any one of claims 1 to 3, wherein when the inverter control unit issues the command, it does not issue a command to supply electric power for releasing the brake of the elevator. Elevator controller. An elevator control method for controlling the operation of the elevator by controlling an inverter that supplies AC power to a motor using a semiconductor element to operate the elevator, wherein the inverter includes a semiconductor element and a thermal a cooler coupled to to cool the inverter;
a first step of determining whether the elevator is stopped;
a second step of supplying power to the semiconductor device by the inverter when the temperature of the cooler is a first temperature;
(3) repeatedly sending and stopping a command to the inverter from before the start time of a busy season when the operating frequency of the elevator is equal to or higher than a predetermined reference value, based on pre-stored information about the operation status of the elevator; a step of
An elevator control method comprising: An elevator control method for controlling the operation of the elevator by controlling an inverter that supplies AC power to a motor using a semiconductor element to operate the elevator, wherein the inverter includes a semiconductor element and a thermal a cooler coupled to to cool the inverter;
a first step of determining whether the elevator is stopped;
a second step of supplying power to the semiconductor device by the inverter when the temperature of the cooler is a first temperature;
a third step of stopping power supply to the semiconductor element when the temperature rise coefficient of the semiconductor element becomes equal to or greater than a predetermined coefficient;
An elevator control method comprising: An elevator control method for controlling the operation of the elevator by controlling an inverter that supplies AC power to a motor using a semiconductor element to operate the elevator, wherein the inverter includes a semiconductor element and a thermal a cooler coupled to to cool the inverter;
a first step of determining whether the elevator is stopped;
a second step of supplying power to the semiconductor device by the inverter when the temperature of the cooler is a first temperature;
a third step of stopping power supply to the semiconductor element when the temperature decrease coefficient of the semiconductor element becomes equal to or greater than a predetermined coefficient;
An elevator control method comprising:

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