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Washing machine three-phase AC-induction direct vector control

Posted: 23 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:brushless three-phase motor? MCU? microcontroller? washing machine? sinusoidal motors?

The latest trend in washing machine design is the replacement of traditional drive systems with modern, electronically controlled, brushless drives. In the past, washing machine designs employed two widely used drive systems. The older designs use electromechanically controlled, two-speed, single-phase.

AC-induction motors. This kind of drive system is no longer used for new machines and is found in the least expensive washer models only. Most washers have universal brushed motors with Triode Alternating Current switch (TRIAC) control. However, with the advent of new electronic devices, these drives are becoming out-of-date. A new generation of washing machines is designed with brushless three-phase motors. The best candidates for this design are three-phase AC-induction motors and permanent magnet sinusoidal motors. Both motors require sophisticated algorithms to perform control functions, and this requires microcontroller-based solutions. DSP-based devices are preferred because of the real-time signal processing demands from AC motor control applications. This application note presents the AC-induction motor alternative, focusing on the description of suitable control algorithms and their implementation in a real washer application.

View the PDF document for more information.

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