| 摘要 |
1. A method of controlling a variable speed asynchronous motor (M) supplied with AC from a current commutator (C) having controlled semiconductors (T1 ..T6 ) and controlling the power supply of the phase windings of the motor (M) stator from DC energy supplied by a current generator (P, H), wherein the current (Id) circulating in the commutator (C) is held at an adjustable value and wherein the current commutator (C) is controlled by setting a firing delay (DELTA T) for is controlled semiconductors (T1 ..T6 ), which delay is defined reference to starting instants (t01 ..t06 ) corresponding to the vectors representing the fundamental components of the voltages (e) at the terminals of the magnetizing inductances (Lm) of the stator phase windings passing through a phase angle of a predetermined value, and has a duration (DELTA) which is determined from the characteristics of the motor in order to obtain an internal phase angle (pi) between the fundamental components of the voltages (e) at the therminals of the equivalent magnetizing inductances (Lm) and equivalent currents (is) in each phase, which internal phase angle, as well as the current (Id), is deduced from a law defined by the conditions of motor (M) utilization. |
