Sensorless PMS Motor Control: Part 1, Motor
Phase Control
by Dennis L. Feucht
Innovatia Laboratories
For years, the search has gone on to find a simple, elegant method for controlling
the phase of permanent-magnet synchronous (PMS) or "brushless dc"
motors without the use of external shaft position sensors. A simple, low-cost
approach to phase control of three-phase PMS motors results from straightforward
application of vector-based motor theory. It vectorially sums the induced
voltage waveforms of motor windings and uses their zero-crossings to produce
correctly-phased six-step commutation.
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