It can commutate
and control brush DC, brushless AC, AC vector, stepping and switched reluctance motors in high speed precision velocity and position motion.
The definition of commutate
, according to Merriam-Webster, is "to reverse every other half cycle of (an alternating current) so as to form a unidirectional current.
The total electronic package to commutate
and control through feedback has become larger, and it is preferable to locate the control package close to the motor.
Commutation information is provided by a mechanically offset encoder that serves as an absolute encoder to commutate
the brushless d-c motor, as well as two incremental speed channels in quadrature with a combined count at the motor shaft of 144,000 counts/revolution for smooth operation in a digital phase-lock speed loop.
Drive the motor sensor less by using the EMF of each phase as information to commutate
current in the phases.