Freescale Semiconductor, Inc.
Designer Reference Manual — 3-ph. ACIM Drive with DTC
Section 1. Introduction
1.1 Contents
1.2
1.3
Application Functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Benefits of the Solution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1.2 Application Functionality
This Reference Design describes the design of a 3-phase AC induction
motor drive with dead time distortion correction. It is based on Motorola’s
MC68HC908MR32 microcontroller which is dedicated for motor control
applications. The system is designed as a motor drive system for
medium power three-phase AC induction motors and is targeted for
applications in both industrial and appliance fields (e.g. washing
machines, compressors, air conditioning units, pumps or simple
industrial drives). The reference design incorporates both hardware and
software parts of the system including hardware schematics with a bill of
material, and a software listing.
1.3 Benefits of the Solution
The design of very low cost variable speed 3-phase motor AC control
drives has become a prime focus point for the appliance designers and
semiconductor suppliers. Replacing variable speed universal motors by
maintenance-free, low noise asynchronous (induction) motors is a trend
that supposes total system costs being equivalent.
Six-transistor inverter is the most used topology for AC motor drives. The
dead time must be inserted between the turning off of one transistor in
the inverter half bridge and turning on of the complementary transistor.
DRM019 — Rev 0
MOTOROLA
Designer Reference Manual
Introduction
13
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