JPH054784U - Inverter device - Google Patents

Abstract

(57) [Abstract] [Purpose] In an inverter device, the fan operates only when heat is generated due to loss from the main circuit, and the life of the fan having a mechanical life is measured. [Structure] A relay 9 is inserted into a power supply circuit for a fan 8 for forcibly cooling the cooling fins 10, and a control circuit section 6 for controlling a main circuit of the inverter device is operated by the inverter device. ON / OFF of the fan 8 in synchronization with the command
The fan control means for controlling was provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to an inverter device for operating an AC induction motor at a variable speed, and particularly to cooling the device. To do.

[0002]

[Prior art]

  A circuit diagram of a conventional inverter device is shown in FIG. In the figure, 1 is a diode The configured converter part, 2 is a resistor and an open / close circuit that short-circuits this resistor except when starting. Current control circuit consisting of a capacitor, 3 smoothing capacitor, 4 switching element and return An inverter section composed of a diversion diode, including a converter section 1 to an inverter section. The part 4 constitutes the main circuit part, and 5 is the insulated power supply part, and the smoothing capacitor 3 is a flat part. Input the smoothed direct current and control the direct current isolated from the input direct current as described later. It is output as the power source of the circuit unit 6. 6 is a control circuit section for controlling the main circuit section, and 7 is an in-circuit section. A gate circuit of the barter section, and 8 is a fan. FIG. 2 is an external view of the radiation fin, The radiator part 10, the inverter part 4, and the fan 8 are attached to the heat radiation fin 10. ing.

[0003]   When power is applied to the inverter device, the heat dissipation fins are The fan 8 for forcibly cooling 10 is turned on to start rotation, and the inverter device To prepare for driving. The inverter device responds to an operation command from the outside. The conversion of DC power to AC power is started in the section 4. When the conversion starts, Heat is generated due to the loss of the power elements of the converter section 4 and the converter section 1. This fever If it is very large, the junction temperature of the power element will exceed its allowable temperature, causing thermal runaway and damage. May lead to. For this reason, the main circuit section is cooled by the radiation fins 10, and the The solid fan 8 forcibly cools the radiation fins 10 to enhance the cooling effect of the radiation fins 10. It

[0004]

[Problems to be solved by the device]   The fan has bearings, etc. and has a mechanical life. Yes, the fan starts operating when the power to the inverter device is turned on. There is a problem in that the life of the rotating device becomes shorter when it is rotated.

[0005]   This invention was made to solve the above problems and has a long life. It is an object of the present invention to obtain an inverter device that prolongs the usage period of a fan.

[0006]

[Means for Solving the Problems]

  The inverter device according to the first invention is a converter unit for converting alternating current into direct current, A smoothing capacitor that smoothes DC, and an inverter that converts the smoothed DC back to AC. A main circuit section having a main circuit section, a control circuit section for controlling the main circuit section, and the main circuit Heat dissipation fins that dissipate heat generated by the loss of parts and the heat dissipation from the above heat dissipation fins Inverter device provided with a fan for controlling the operation of the inverter device. And a fan control means for controlling ON / OFF of the fan in synchronization with It

[0007]   The inverter device according to the second invention is a converter for converting alternating current into direct current. Part, smoothing capacitor that smoothes DC, reversely converts smoothed DC into AC A main circuit section having an inverter section; a control circuit section for controlling the main circuit section; Heat dissipation fins that dissipate heat generated by the loss of the main circuit, and heat dissipation from the above heat dissipation fins In an inverter device provided with a fan for supporting the -File that turns on in synchronization with the operation of the data section and turns off after a predetermined time from the end of operation. It has a control means.

[0008]

[Action]

  The fan control means in the first invention is operated in synchronization with the operation command of the inverter device. ON / OFF control the fan.

[0009]   Further, the fan control means in the second invention causes the fan to move the inverter part. Control to turn on in synchronism with the work and turn off after a predetermined time from the end of operation .

[0010]

【Example】

Example 1.   An embodiment of the first and second inventions will be described with reference to FIG. In the figure, 1-8 And 10 are the same as in the conventional example. Reference numeral 9 is a relay for controlling the power supply to the fan 8. is there. The external view of the radiation fin 10 is the same as the conventional example shown in FIG. Omit the light.

[0011]   In one embodiment of the first invention, the filer is synchronized with the operation command of the inverter device. A fan control means for controlling ON / OFF of the fan 8 is provided to supply power to the inverter device. When supplied, the conversion of the inverter section is started according to the external operating device. But, When the external operation signal is not input, the conversion of the inverter does not start . When the conversion of the inverter section is not started, no loss occurs in the main circuit section. Therefore, it is not necessary to forcibly cool the radiation fin 10, so the fan 8 is not operated. Control relay 9 as follows. However, when a driving command is input from the outside, the inverter -Because the conversion in the converter section 4 is started, loss occurs from the main circuit element and the heat dissipation fin Since the temperature of 10 rises, the relay 9 is controlled to start the operation of the fan 8. . Conversely, when the operation command is released from the outside and the conversion in the inverter unit 4 stops, the main Since the loss from the circuit elements does not occur, the operation of the fan 8 is stopped.

[0012]   In the first embodiment of the second invention, the fan 8 is connected to the inverter 4 Fan control that turns on in synchronism with the operation of and turns off after a predetermined time from the end of the operation When the external operation command is released and the conversion of the inverter is stopped, the main circuit And, until the heat radiation fin 10 is sufficiently cooled, the operation of the fan 8 is After the conversion is stopped, the relay 9 is controlled so as to continue for a predetermined time.

[0013]

[Effect of device]   As described above, according to the first invention, the fan is operated only when the inverter device is operating. Since it is designed to rotate, it is possible to obtain a fan with a mechanical life expecting a longer life. It is effective.

[0014]   According to the second invention, the fan operation is stopped after waiting for a certain time when the operation is stopped. As a result, the effect that the heat dissipation effect of the main circuit parts can be fully expected can be obtained. There is a fruit.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an inverter device according to an embodiment of the first and second inventions.

FIG. 2 is a view showing the appearance of a cooling structure common to the present invention and the conventional one.

FIG. 3 is a circuit diagram of a conventional inverter device.

[Explanation of symbols]

1 converter section 4 Inverter section 6 control circuit 7 Gate circuit 8 fans 9 relay 10 radiating fins

Claims (2)

[Scope of utility model registration request] 1. A main circuit section having a converter section for converting AC to DC, a smoothing capacitor for smoothing DC, and an inverter section for inversely converting smoothed DC into AC, and the main circuit section. In an inverter device including a control circuit unit for controlling the heat dissipation, a heat dissipation fin for dissipating heat generated by the loss of the main circuit unit, and a fan for assisting heat dissipation from the heat dissipation fin, the operation of the inverter device An inverter device comprising fan control means for controlling ON / OFF of the fan in synchronization with a command. 2. A main circuit section having a converter section for converting AC to DC, a smoothing capacitor for smoothing DC, and an inverter section for inversely converting smoothed DC into AC, and the main circuit section. In an inverter device including a control circuit unit for controlling the heat dissipation, a heat dissipation fin for dissipating heat generated by the loss of the main circuit unit, and a fan for assisting heat dissipation from the heat dissipation fin, the fan is provided with the inverter. An inverter device comprising fan control means that is turned on in synchronism with the operation of the unit and is turned off after a predetermined time from the end of the operation.