JPH0595965U - Elevator control device - Google Patents

Abstract

(57) [Summary] [Structure] When the elevator is in the operating state, the operating state detection signal 8 is closed, and the three-phase AC power source 1 is supplied to the heat cooling fan 7 via the main switch 2. Cools the power loss heat due to the switching of the converter 3 and the inverter 4. On the other hand, an elevator operating state detecting device is provided so that the thermal cooling fan 7 does not operate when the operating state detection signal 8 is opened when the elevator is continuously stopped for a predetermined time or longer. [Effect] By operating the cooling fan only when necessary, it is possible to extend the life and save power.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an elevator control device, and more particularly to an elevator control device that performs variable voltage variable frequency control by switching a large capacity semiconductor device.

[0002]

[Prior Art]

 The technological progress adopted in elevators is remarkable. Particularly in recent years, variable voltage and variable frequency control type elevators that use large-capacity semiconductors and microcomputers have become the mainstream. Fig. 2 shows the main circuit of the variable voltage and variable frequency control type elevator by switching of this large capacity semiconductor. 1 is a 3-phase AC power supply, 2 is a main switch, 3 is a converter for converting the 3-phase AC power supply of 1 into DC, 4 is an inverter for converting the DC power supply by the power supply converter of 3 into an arbitrary AC frequency Indicates. Reference numeral 5 is a smoothing capacitor of the DC output power source of the converter 3, 6 is a three-phase induction motor, and 7 is a heat cooling fan generated from the large-capacity semiconductors of the converter 3 and the inverter 4. As shown in the figure, when the main switch 2 is closed, the three-phase AC power supply 1 is applied to the converter 3 and the thermal cooling fan 7. When an elevator operation signal (not shown) is generated, the inverter 4 operates to control the acceleration / deceleration of the three-phase induction motor 6. At this time, power loss during switching occurs as heat from the converter 3 and the inverter 4, which are made of a large-capacity semiconductor. Since the cooling efficiency is limited only by the natural radiation of the generated heat by the radiator, the cooling fan 7 is generally adopted to further enhance the cooling efficiency. However, as described above, the three-phase AC power supply 1 is always applied to the thermal cooling fan 7 while the main switch 2 is closed, regardless of the operating state of the elevator, so that the fan is always operated. It is configured to rotate.

[0003]

[Problems to be solved by the device]

 The heat-cooling fan 7 is an important component that prevents the converter 3 and the inverter 4, which are the main devices of the elevator control device, from being destroyed by the heat generated by themselves. Therefore, the failure of the thermal cooling fan 7 leads to the destruction of the converter 3 and the inverter 7.

On the other hand, as described above, the heat-cooling fan 7 is constantly operating regardless of the operating state of the elevator, which has been a factor that unnecessarily shortens the life of the heat-cooling fan 7.

An object of the present invention is to provide an elevator control device capable of maintaining the cooling efficiency by the thermal cooling fan and extending the life.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention performs switching by using a large-capacity semiconductor element, and applies a variable voltage variable frequency control method while radiating heat generated by switching of the large-capacity semiconductor by a cooling device. An elevator control device that performs deceleration operation is equipped with a detection device that detects the operating state of the elevator, and if this detection device causes the elevator to remain idle for more than a specified time, the cooling device for the large-capacity semiconductor is stopped. It is configured to do.

[0007]

[Action]

 In other words, when the elevator is stopped for more than a predetermined time by the device that detects the continuous stop time as the operating state of the elevator, the converter and inverter are not operating, so there is no need for thermal cooling and heat The cooling fan does not need to operate either.

[0008]

【Example】

 An embodiment according to the present invention is shown in FIG. FIG. 1 is a block diagram of an elevator main circuit according to the present invention. The symbols in the figure are the same as those in the conventional elevator main circuit configuration diagram of FIG. However, symbol 8 is a normally open signal contact of a device (not shown) for detecting the operating state of the elevator, which is closed when the elevator is in the operating state and is opened when the elevator is continuously stopped for a predetermined time or longer. Indicates signal contacts.

Next, the operation will be described.

When the elevator is in operation, the main switch 2 is closed and the three-phase AC power supply 1 is supplied to the converter 3. Further, the three-phase AC power supply 1 is converted into a DC power supply by the converter 3, and is supplied to the inverter 4 as a stable power supply via the power supply smoothing capacitor 5. When an elevator operation signal is generated, the inverter 4 outputs an AC power source of variable voltage and variable frequency, and the operation of the three-phase induction motor 6 is smoothly controlled from start to stop. At this time, the elevator operation state detection device (not shown) determines that the elevator is in the operation state, and the signal contact 8 is closed. Therefore, the voltage of the three-phase AC power supply 1 is supplied to the heat cooling fan 7 via the main switch 2 and the operating state detection signal 8. As a result, the power loss heat generated when the converter 3 and the inverter 4 are switched is efficiently cooled.

Next, a case where the elevator is continuously stopped for a predetermined time or more will be described. When the elevator is continuously stopped for a predetermined time or longer without operating at night, the operating state detection signal 8 is opened. Therefore, power is not supplied to the heat cooling fan 7, and the heat cooling fan 7 does not operate. However, since the elevator is in a stopped state, neither the converter 3 nor the inverter 4 operates, and the elevator is not in a heat generating state.

As described above, the heat cooling fan 7 can be operated only when necessary.

[0013]

[Effect of the device]

 According to the present invention, the elevator operates and the operation of the large-capacity semiconductors such as the converter and the inverter increases the cooling efficiency by the thermal cooling fan in the heat generation state, and the elevator stops for a predetermined time or longer, and the converter and the inverter operate. When the temperature is low, the thermal cooling fan is stopped so that the thermal cooling fan can have a long life. Also, since it operates only when necessary, it has the effect of improving efficiency such as power saving.

[Brief description of drawings]

FIG. 1 is a main circuit configuration diagram showing an embodiment of an elevator control device of the present invention.

FIG. 2 is a main circuit configuration diagram of a conventional elevator control device.

[Explanation of symbols]

 1 3-Phase AC Power Supply 2 Main Switch 3 Converter 4 Inverter 6 3-Phase Induction Motor 7 Heat Cooling Fan 8 Elevator Operating State Detection Device Signal Contact

Claims (1)

[Scope of utility model registration request] 1. An elevator controller for performing acceleration / deceleration operation by a variable voltage variable frequency control method while performing switching by using a large capacity semiconductor element and radiating heat generated by switching of the large capacity semiconductor by a cooling device. An elevator control characterized by being provided with a detection device for detecting the operating state of the elevator, and when the detection device causes the elevator to remain idle for a predetermined time or longer, the cooling device for the large-capacity semiconductor is stopped. apparatus.