JP3255262B2 - Inverter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter having an improved wiring structure of a main circuit having a rectifier, a smoothing capacitor and an inverter.

[0002]

2. Description of the Related Art FIG. 3 shows a wiring structure of a conventional inverter main circuit. In the figure, 51 is a case made of an insulating material such as synthetic resin, 54 is a rectifier for full-wave rectification of an input three-phase AC voltage, 56 is a smoothing capacitor for smoothing the full-wave rectified voltage and converting it to a constant DC voltage Reference numeral 53 denotes an inverter unit including a power transistor that is turned on and off to convert the DC voltage into a voltage-controlled three-phase AC voltage. Numerals 52a to 52j denote bus bars for electrically connecting the rectifier 54, the smoothing capacitor 56 and the inverter unit 53 to each other, and each end thereof has a screw 57c attached to a terminal block 58 attached to the case 51 by a screw 57d. It is fixed by.

A cooling fin 55 for radiating heat generated from the semiconductor switching elements in the inverter 53 and the rectifier 54 is provided.
Attached to.

[0004]

In the above-described conventional wiring structure, when connecting the rectifier 54, the smoothing capacitor 56, and the inverter unit 53 to the terminal block 58, a plurality of types of bus bars having a specific structure are provided in accordance with each connection portion. After selecting and setting from among them, the end of the bus bar is screwed to the terminal block 58, and the wiring and connection work is completed only. This requires a lot of time and effort for wiring and connection work,
There was a possibility that the busbar was incorrectly installed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to simplify the busbar wiring and connection work, to greatly reduce the work time and labor, and to mount the busbar. An object of the present invention is to provide an inverter capable of preventing a mistake.

[0006]

In order to achieve the above object, the present invention provides a rectifier, a smoothing capacitor for smoothing an output voltage of the rectifier, and a DC voltage of the smoothing capacitor in an insulating case. comprising at least an inverter unit for converting the voltage, the rectifier, smoothing capacitor and an inverter unit in an inverter formed by connecting to each other by the bus bar, during resin molding of the case, integrally formed
Form a terminal block for external circuit connection depending on the shape
The bar is integrated and fixed, and the rectifier,
One end is connected to the connection of the capacitor or inverter.
The other end of the bus bar is pre-arranged on the terminal block.
Things.

[0007]

In the present invention, since the bus bar is assembled into a predetermined position and integrated at the same time as the case is manufactured, and the end of the bus bar is arranged on the terminal block, each element is connected to the terminal block. In this case, it is not necessary to select or set an appropriate bus bar, or to perform a screwing operation between the end of the bus bar and the terminal block. In particular, if the bus bar is incorporated at the time of resin molding of the case, the case including the terminal block and the bus bar can be easily integrated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of this embodiment. In the figure, an inverter 53 and a rectifier 54 are attached to cooling fins 59A and 59B by screws 57b, respectively, and these cooling fins 59A and 59B are screwed by screws 57a.
To the case 60 made of synthetic resin.

As is apparent from FIG. 2, a terminal block 60a is formed in the case 60 by integral molding, and bus bars 58a to 58j for interconnecting the inverter unit 53, the rectifier 54 and the smoothing capacitor 56 are provided. Case 6
In the resin molding of No. 0, it is inserted, integrated, and fixed.

The screws 57c provided on the terminal block 60a are used for connection to an external circuit, and have no relation to the fixing of the bus bars 58a to 58j. 58g, 58i, 58
The arrangement and fixation of each end of j are based on resin molding.

That is, in this embodiment, a bus bar having a structure corresponding to each connection portion is arranged at a predetermined position in advance, and the case 60 including the terminal block 60a is formed by resin molding. It eliminates the need for a typical busbar set. In addition, by arranging the end of the bus bar on the terminal block 60a in advance, the work of screwing the end of the bus bar to the terminal block, which is conventionally required, becomes unnecessary. The connection terminal of the external circuit may be screwed to the end. Here, the bus bars 58a to 58
The connection between j and the inverter unit 53, the rectifier 54, and the smoothing capacitor 56 is performed in the same manner as in the related art.

According to the above embodiment, it is simple and in a short time.
The bus bar can be integrated into the case.

[0013]

As described above, according to the present invention, the bus bar is integrally incorporated and fixed at the time of manufacturing the case, and the end of the bus bar is arranged in advance on the terminal block, so that the wiring and connection of the bus bar are achieved. Work can be simplified and work time and labor can be greatly reduced. Further, since it is not necessary to set busbars corresponding to each connection part after the fact, it is possible to prevent incorrect mounting of the busbars and to improve the product yield.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 53 Inverter part 54 Rectifier 56 Smoothing capacitor 57a-57c Screw 58a-58j Bus bar 59A, 59B Cooling fin 60 Case 60a Terminal block

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02M 7/48 H02G 5/00 H02M 7/04

Claims (1)

(57) [Claims] 1. An insulating case comprising at least a rectifier, a smoothing capacitor for smoothing an output voltage of the rectifier, and an inverter for converting a DC voltage of the smoothing capacitor to an AC voltage. In an inverter in which a capacitor and an inverter are connected to each other by a bus bar, an external circuit connection is formed by integral molding during resin molding of the case.
Form a terminal block for connection and assemble busbars
Crowded at fixed, the rectifier, connect a smoothing capacitor or inverter
The other end of the bus bar, one end of which is connected to the
An inverter, which is previously arranged on a table .