JPH0534081Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a resistor unit for a motor, especially for regenerative braking to consume energy during deceleration of a motor used in an inverter device that controls the speed of the motor. This relates to resistor units.

[Conventional technology]

Conventionally, in a resistor unit for a motor, for example, a resistor unit for regenerative braking, a resistor is attached to a main body panel, and a resistor connected to a wiring terminal block is attached inside or outside the control panel.

Fig. 4 is a perspective view of a conventional regenerative braking resistor unit, Fig. 5 is a right side view of the resistor unit installed inside the panel, and Fig. 6 is a perspective view of the resistor unit installed outside the panel. FIG. In the figure, 1 is a plate that becomes the unit mounting foot of the main body panel, 2 is a cover attached to plate 1, 3 is a resistor attached to plate 1, and 4 is for wiring from resistor 3 to terminal block 5. electric wire, 6
is a push-pull to eliminate circulation with outside air, 7
is the control panel to which this resistor unit is installed, 8
9 is an electric wire for wiring this resistor unit to other equipment, and 9 is a mounting screw for attaching this resistor unit to the control panel 7.

When the regenerative braking resistor unit shown in FIG. 4 is installed in the control panel 7, the configuration is shown in FIG. 4 is connected to the control panel 7 using mounting screws 9. Further, this resistor unit and other equipment are wired using electric wires 8.
On the other hand, if it is installed outside the control panel 7, the configuration will be as shown in FIG. 6, in which a resistor unit similar to that shown in FIG. Wired to eliminate air circulation.

[Problem that the invention attempts to solve]

The conventional motor resistor unit is constructed as described above, so if it is installed inside the control panel 7, the heat generated by the resistor 3 will raise the temperature inside the panel, which will have an adverse effect on other equipment. Also, if it is installed outside the control panel 7, there is a problem that the conductive parts such as the terminal block 5 will be exposed to the outside air, and the wiring to the control panel, which has a sealed structure in consideration of environmental resistance, should be sealed on the control panel side. However, there was a problem in that it was necessary to take measures for wiring.

This idea was made to solve the problems mentioned above, and it is a motor resistor that does not cause the temperature inside the control panel to rise and does not expose conductive parts such as terminal blocks to the outside air. The aim is to obtain units.

[Means for solving problems]

In the motor resistor unit according to this invention, a plate is attached to a motor control panel to close the opening of the control panel, a resistor is attached to one side of the plate, and the resistor is positioned outside the control panel. A cover covering the device is attached to the board, a conductive part such as a terminal block is attached to the other side of the board, and it is located inside the control panel, and this conductive part and the resistor are electrically connected with a wire. The electric wire is inserted through a through hole formed in a plate material, and the through hole portion through which the electric wire is inserted is sealed with a sealing member.

[Effect]

The motor resistor unit in this invention is
By installing the resistor unit inside the control panel, the resistor, which is the heat generating part, is taken out of the panel, the electric wire is inserted into the through hole formed in the plate material, and the gap between the through holes is sealed with a sealing member. However, by connecting the resistor and the conductive part with the electric wire, the conductive part can be housed within the panel without air circulation.

〔Example〕

In this design, the conventional method was to expose the heat generating part and the conductive part to the outside, but now the heat generating part and the conductive part are separated using the plate material and sealing material of the resistor unit itself to eliminate air flow between the heat generating part and the conductive part. The resistor unit and the conductive part are attached to a plate material, and the control panel is of a sealed structure, with the heat generating part being outside the panel and the conductive part being inside the panel.

An embodiment of this invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an embodiment of the regenerative braking resistor unit according to the invention, FIG. 2 is a front view of the regenerative braking resistor unit installed on a control panel, and FIG. 3 is a right side view thereof. In the figure, 1 is the motor control panel 7
A plate is attached to the control panel 7 using mounting screws 9 by closing the opening 7a of the panel 7, and 3 is a resistor attached to one side 1a of the plate 1 to be located outside the control panel 7. This resistor 3 is covered by a cover 2 attached to the plate 1. In addition, in this FIG. 1, the resistor 3 is connected to the plate material 3 through the cover 2.
Although the case is shown in which it is attached to the plate material 1, it may be attached directly to the plate material 1. Further, the cover 2 may be attached directly to the plate 1 as shown in the figure, but it may also be attached to the plate 1 by being fixed to the resistor 3.

Reference numeral 5 denotes a conductive part attached to the other side surface 1b of the plate 1 to be located inside the control panel 7, and in this embodiment, a terminal block is shown. 4 is resistor 3
This is an electric wire that electrically connects the terminal block 5 and the terminal block 5, and is inserted through a through hole formed in the plate material 1. 20 is a sealing member for sealing the through hole through which the electric wire 4 is inserted, and in this embodiment, a bush is used. Reference numeral 8 denotes an electric wire whose one end is connected to the terminal block 5 for wiring this resistor unit and other electrical equipment.

In the motor resistor unit configured as described above, the resistor 3, which is a heat generating part, is covered with a cover 2 that protects it from touching the plate material 1.
and become one. Further, the plate insertion portion of the electric wire 4 for wiring the resistor 3 is sealed via a bush 20, and the electric wire 4 is connected to the terminal block 5. This resistor unit is connected to an opening 7a formed in the control panel 7.
The control panel 7 is installed with mounting screws 9, has a heat generating part outside the panel, has a conductive part such as a terminal block 5 inside the panel, and has a sealed structure.

Therefore, the conventional work of forming holes for bushings in the control panel can be omitted with the resistor unit according to this invention, which simplifies the work of installing the resistor on the control panel at the installation site. , work efficiency can be improved.

In the above description, the motor resistor unit is used for regenerative braking, but it can also be applied to other braking resistor units.

[Effect of idea]

As described above, according to this invention, the heat generating part of the resistor unit is placed outside the control panel, the conductive parts such as the terminal block are placed inside the panel, and the conductive part and the resistor are inserted through the board. Electrical connection is made using electric wires,
The sealed structure eliminates air circulation between the inside and outside of the control panel, so the temperature inside the control panel does not rise and have an adverse effect on other equipment, and conductive parts such as terminal blocks are not exposed to the outside air. This has the effect that there is no need to do anything, and the efficiency of the installation work is high.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of this invention, Fig. 2 is a front view showing the motor resistor unit installed on a control panel, Fig. 3 is a right side view, and Fig. 4 is a perspective view showing an embodiment of the invention. 5 is a perspective view of a conventional resistor unit for a motor, and FIGS. 5 and 6 are right side views of the resistor unit shown in FIG. 4 attached to a control panel, respectively. 1... Plate material, 1a... One side, 1b... Other side, 2... Cover, 3... Resistor, 4... Electric wire,
5... Conductive part (terminal block), 7... Motor control panel,
7a...opening, 20...sealing member (button).
In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] a plate that is attached to the motor control panel so as to close an opening of the control panel; a resistor that is attached to one side of the plate to be located outside of the control panel;
A cover is attached to the plate to cover the resistor, and a conductive part such as a terminal block is attached to the other side of the plate to be located inside the control panel, and the conductive part and the resistor are provided. A resistor unit for a motor is characterized in that the resistor unit is sealed with a sealing member and electrically connected by an electric wire passing through a through hole formed in the plate material.