Browse Prior Art Database

HIGH WATTAGE POWER DEVICE HEAT SINK AND RETAINER

IP.com Disclosure Number: IPCOM000005797D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-07
Document File: 2 page(s) / 79K

Publishing Venue

Motorola

Related People

Ralph Gromala: AUTHOR [+2]

Abstract

Previous motor control power electronics were mounted on heat sink by clips and provided with only limited air cooling for heat dissipation. The electronics and retaining clips were positioned adjacent to the rotor of the motor. This previous assembly design of the heat sink and retaining clips disrupted the air flow, required ex- cessive space and was difficult and costly to implement.

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MO7VROLA Technical Developments August 1989

HIGH WATTAGE POWER DEVICE HEAT SINK AND RETAINER

by Ralph Gromala and Nick Ferrer

   Previous motor control power electronics were mounted on heat sink by clips and provided with only limited air cooling for heat dissipation. The electronics and retaining clips were positioned adjacent to the rotor of the motor. This previous assembly design of the heat sink and retaining clips disrupted the air flow, required ex- cessive space and was difficult and costly to implement.

   In the present invention a power device retainer/heat sink 1 is cast or extruded from a highly thermally conductive material. The retainer/heat sink 1 is configured around the shape of a rotor 2 with the heat sink pro- viding an effective smooth surface la adjacent to the rotor. This configuration allows for optimum air flow pat- tern to develop around the retainer/heat sink 1 surface when the rotor spins and creates an air flow, thereby maximizing heat convection to the working medium. The retainer/heat sink 1 is fastened to a printed circuit board substrate 6 containing the motor control electronics which include a plurality of power devices 3. The retainer/heat sink 1 contains supporting walls which form a plurality of slots 7 for receiving each of the power dissipation devices 3. Thermally conductive insulators 4 are mounted between each of the power devices 3 and one of the supporting walls of the retainer/heat sink 1. These insulators provide electric...