Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Reexamination Certificate
1999-04-21
2001-11-06
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
C361S025000, C361S115000
Reexamination Certificate
active
06313974
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a resistor utilized in a servo amplifier used in a controller of an industrial equipment such as a machine tool, robot, an injection molding apparatus, a wire electric discharge device and an electric motor presses. The present invention is further related to a servo amplifier provided with this resistor.
2. Description of the Related Art
Servo amplifiers are provided with resistors which generate large amounts of heat such as regenerative resistors which function to consume regenerative current. When installing a resistor which generates large amount of heat in a servo amplifier, the resistor is mounted at location separated from the internal components of the amplifier as well as at the rear of the amplifier in order to eliminate the effects of heat on the internal components of the amplifier.
FIG. 3
shows an example of a conventional servo amplifier provided with a resistor that generates a large amount of heat. A semiconductor module, such as an inverter, and various circuit components
101
are arranged on the surface of a casing
104
of the servo amplifier. Heat sink
102
is disposed on the rear surface of the casing
104
. This heat sink functions to release heat generated from the semiconductor module. Further, resistor
103
that generates large amounts of heat is mounted on the rear surface of the casing
104
separated from the heat sink
102
as well as from the various circuit components
101
.
If a resistor is separated and mounted away from the internal components of the amplifier and if a resistor is separated and installed away from the internal components of the amplifier on the rear surface of the amplifier, the external shape of the amplifier will grow larger making it impossible to respond to demands for smaller sized servo amplifiers. Moreover, if heat generation passes through the casing of the amplifier and transfers to the inside of the amplifier, the temperature of the components inside the amplifier will rise and as a result lead to lower component lifecycles.
OBJECTS AND SUMMARY OF THE INVENTION
An object of the present invention is to provide a resistor with a construction that makes it difficult for heat to transfer to a servo amplifier and a servo amplifier provided with that resistor.
The resistor for a servo amplifier of the present invention has an assembling construction for mounting a resistor main body to a servo amplifier through an adiabatic layer. The transmission of heat from the resistor main body to the servo amplifier is suppressed by this layer.
In more detail, the transmission of heat from the resistor main body to the partition panel was prevented by providing a resistor main body and a partition panel which has an assembling construction for being mounted on a servo amplifier, linking the resistor main body and the partition panel at intervals using a member comprising a leg portion, and then either providing an adiabatic spacer in this linked portion or composing the leg portion with an adiabatic member. Another way is to compose the partition panel by a material with poor thermal conductivity.
The resistor is assembled in the servo amplifier main body to construct a servo amplifier.
A resistor for a servo amplifier according to the present invention can be mounted at any location on the servo amplifier because an adiabatic layer is provided at the mounting portion of the resistor main body and the servo amplifier to cutoff radiant heat and conductive heat from the resistor main body. Further, since there are no restrictions on the mounting position of the resistor, the size of the servo amplifier can be reduced by installing the resistor on the servo amplifier main body.
REFERENCES:
patent: 3813937 (1974-06-01), Fletcher et al.
patent: 4739232 (1988-04-01), Ishimoto
patent: 5563570 (1996-10-01), Lee
patent: 0406448A1 (1991-01-01), None
patent: 02-121312 (1990-10-01), None
patent: 62-101201 (1987-06-01), None
patent: 051-29146 (1993-05-01), None
Matsubara Shunsuke
Shinohara Tatsuo
Takeshita Makoto
Fanuc Ltd.
Jackson Stephen W.
Staas & Halsey , LLP
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