BRUSHLESS DC MOTOR DRIVE SCHEMES (Electric Motors)

10.11
While elaborate and expensive drive schemes are possible, in many applications simplifying assumptions are made that lead to readily implemented drive schemes that perform reasonably well. This section illustrates these simple drive schemes for two-and three-phase motors. The fundamental task for a motor drive is to apply current
to the correct windings, in the correct direction, at the correct time. This process is called commutation, since it describes the task performed by the commutator (and brushes) in a conventional brush dc motor. The goal here is to develop an intuitive understanding, rather than discuss every nuance of every possible motor drive scheme. More detailed information can be found in references such as Leonhard (1985) and Murphy and Turnbull (1988). With this intuitive understanding, more complex drive schemes are readily understood.