| 摘要 |
An electronically switched motor comprising a stator-rotor assembly (10, 12) fitted with three-phase driving windings (12) and further comprising a series of switches (20, 22) for powering the windings, and control means (26, 28, 32) suitable for regulating the speed of the motor on a reference speed (Vc), said control means (26, 28, 32) including means (18, 26, 28) for monitoring the relative speed of the stator (12) and the rotor (10), and means for causing each switch (20, 22) to switch on and off in compliance with a repeated sequence selected to power the driving windings as a function of the signals (Vc, Vm) supplied by the speed monitoring means (18, 26, 28), said sequence including a succession of on/off pulses with a duty ratio that is a function of the speed monitoring, the motor being characterized in that the control means are suitable for responding to signals delivered by the monitoring means (18, 26, 28) to generate two modes for controlling the switches (20, 22), the sequence of the second switch control mode having switch ON states that include the ON states of the switches in final operation of the first mode, and an on state or a succession of on pulses in phase advance which is directly extended by one of said on states.
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