| 摘要 |
The motor (1) comprises a rotor (2) with permanent magnets with at least one pair of poles, a stator (3) having a winding (L1, L2) wound around a magnetic circuit (3), position-detectors (5) for providing driving signals (P1, P2) in dependence on the angular position of the rotor (2), and a driver circuit (10) for controlling the flow of current in the stator winding (L1, L2) in dependence on the signals supplied by the position-detectors (5). The winding is divided into a first half-winding and a second half-winding (L1, L2) wound around the magnetic circuit (3) in opposite directions. The driver circuit comprises first and second controlled switches (Q1, Q2) in series with the first stator half-winding and with the second stator half-winding (L1, L2), respectively, in respective circuit branches (B1, B2) arranged in parallel between the supply terminals (A, B). These switches (Q1, Q2) have respective control inputs connected to the position-detectors (5; PT1, PT2) in an arrangement such that, during steady-state operation, respective unidirectional currents (IL1, IL2) having a frequency equal to half of the frequency of the alternating supply voltage (VAB) flow through the half-windings (L1, L2) alternately. <IMAGE> |
