Power modules simplify design of variable-speed motor drives

25 February 2004 Power Electronics / Power Management

International Rectifier has introduced three new advanced integrated power modules (IPMs), expanding its iMOTION family of integrated power modules. IPMs simplify variable-speed electronic motor control circuits commonly found in modern energy-efficient appliances and feature a three-phase inverter power stage with gate drivers and auxiliary circuitry in a compact, high-performance, isolated package.

All three devices combine IR's low loss, non-punch-through (NPT) short circuit-rated IGBT with a three-phase, high-voltage, high-speed driver IC and over 20 individual parts into a single unit. The modules, plus a few external components and one microcontroller, enable a complete variable-speed motor drive. EMI emissions are minimised due to shorter interconnection routing, optimised component layout and internal shielding.

The 6A-rated IRAMS06UP60A and IRAMS06UP60B are designed for motor drive applications in appliances and light industrial products such as compressors in refrigerators or fan controllers in heating and ventilation systems up to 400 W. The '60A has open emitter configuration and therefore enables multishunt current feedback for sophisticated vector control loops. The '60B includes a current feedback shunt, and is designed for appliances such as airconditioners and energy-efficient washers up to 750 W. The '60B is a good choice for simplified V/Hz control type motor drivers, with no circuit layout limitations.

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