Housing for motor control unit
AssigneeFanuc Corporation
InventorYoshiki Fujioka
Life of this patent
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Abstract
A control unit according to the invention has a plastic case (v) housing only power components (v), such as transistors for an inverter, among components constituting a control circuit. Other circuit components such as resistors are mounted on a printed circuit board, and the case and circuit board are secured to each other by fasteners allowing the case to be made light in weight. Screws for mounting the power components to the case are of the same size, and so are the energizing terminals. This makes possible automated assembly by robot.
Claims14
A housing for a motor control unit, comprising:
- a plastic case having upstanding walls and a bottom, the bottom having an upper surface provided at predetermined locations with ribs and a plurality of mounting holes of the same size extending into the bottom from the upper surface of the bottom, and the walls having an upper portion provided with a predetermined number of engaging members at corners of the case;
- a plurality of power components housed in said case and fixed at said mounting holes by screws, each screw being the same size and each power component being provided at an upper portion with energizing terminals of the same size;
- a printed circuit board having an underside on which there is formed a circuit pattern which contacts the energizing terminals of said power components and an upper side on which circuit components are disposed, said printed circuit board being fixed to the case by inserting the engaging members of said case through engaging holes formed at corresponding corners of said printed circuit board;
- and
- heat radiating fins selected to have a predetermined heat capacity and fixed to an underside of the bottom portion of the case so as to be freely attachable and detachable.
A housing for a motor control unit, comprising:
- a case including upstanding walls and a bottom, said bottom having ribs on an upper surface thereof and a plurality of mounting holes provided at predetermined locations to extend into the bottom from the upper surface thereof, and an upper portion of said walls having a predetermined number of engaging members at corners of the case;
- a plurality of power components mounted in said case with screws at the mounting holes, said screws being the same size and each power component having energizing terminals mounted on upper portions thereof;
- a printed circuit board including an underside having a circuit pattern formed thereon which contacts the energizing terminals, an upper side on which a predetermined array of circuit components is disposed, and engaging holes at corresponding corners thereof for receiving therethrough the engaging members of said case for mounting said printed circuit board to said case;
- and
- removable heat radiating fins attached to an underside of the bottom of said case, said fins being selected to have a predetermined heat capacity.
Dependencies are inferred from the claim text.