| 摘要 |
The method allows the control in steady state, without a position sensor, of a two-phase d.c. brushless motor (BM) comprising a permanent magnet rotor (R) and two phase windings (W1, W2) connected in series to respective electronic switches (M1, M2) between the two poles of a d.c. voltage supply source (V CC ). The switches (M1, M2) are driven in such a way that they are rendered alternately conductive. The method comprises the operations of:
detecting the amplitude of the current flowing through the motor (BM);
comparing the instantaneous value of a predetermined control variable (I(t); t) with a threshold (I thr ; t thr ) computed as a predetermined function of the detected amplitude of the current flowing through the motor (BM); and
causing said electronic switches (M1, M2) to change state when the value of the control variable (I(t); t) exceeds the threshold (I thr ; t thr ). |
