US 4,908,738 AGranted

Drive motor control unit

AssigneeFanuc Corporation

InventorsKatsuo Kobari, Naoto Ota, Naoyuki Suzuki, Yuji Kanamori

Life of this patent

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Abstract

A motor drive unit used in controlling an AC motor which drives the spindle or feed shaft of a machine tool is suitable for automatic assembly in which a plurality of electrical components are mounted and wired. In accordance with the motor drive unit of the invention, an upper frame (2) supporting a printed circuit board (1) having electrical circuitry which employs control semiconductors, and a lower frame (4) for mounting a heat radiating device (5), which mounts a rectifier or the like, as well as a power resistor (6), are constructed of synthetic resin. A power board (3) on which power circuit components are connected by soldering is sandwiched between the two frames (2), (4) and has the components on the heat radiating device (5) and the power resistor (6) mounted and connected thereto by screws. The two frames (2), (4) are fastened together by screws (25).

Claims8

Dependent claims

A drive motor control unit

including electrical components, which include control circuit components and power circuit components, to be used in controlling an AC motor, comprising:
a control circuit board mounting said control circuit components;
a first frame having a top, a central space, and a plurality of legs extending downwardly from the top and supporting the control circuit board on said top;
a connecting power distribution board having upper and lower surfaces and mounting said power circuit components;
and
a second frame having an upper surface, a lower surface, and a central space, the connecting power distribution board being connected to the upper surface, said first frame being connected to said second frame to support said control circuit board over said connecting power distribution board;
at least some of the power circuit components being electrically connected to the lower surface of the connecting power distribution board and being mechanically supported by the lower surface of the second frame.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/233,652Filed 8 Jul 1988
Priority: JP 61-30302119 Dec 1986
Granted: 13 Mar 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H02M 7/003
Conversion of AC power input into DC power output; Conversion of DC power input into AC power output: constructional details, e.g. physical…
H05K 7/14322
Specially adapted for power drive units or power converters: wherein the control and power circuits of a power converter are arranged within the…
H05K 1/144
Structural association of two or more printed circuits: stacked arrangements of planar printed circuit boards
H02M
Apparatus for conversion between ac and ac, between ac and dc, or