| 摘要 |
A control circuit for an electric motor without commutator is described, comprising: a plurality of electronic phase switches (Q1, Q2, Q3) each of which is connected in series with a winding or phase (W1, W2, W3) of the motor to selectively couple this winding (W1, W2, W3) to a DC supply voltage source (B); a driving circuit (10) for the said electronic phase switches (Q1, Q2, Q3); and a current recirculation network (D1, Q4; D2, Q5; D3, Q6) for draining the transient current which flows in each phase of the motor whenever the associated electronic switch (Q1, Q2, Q3) is turned off. This recirculation network includes a recirculation diode (D1, D2, D3) for each phase, connected to the supply voltage source (B) through a respective electronic recirculation switch (Q4, Q5, Q6) which can be selectively controlled. <IMAGE> |
