| 摘要 |
This invention relates to the control of electrical machines, in particular flux switching and switched reluctance electrical machines without a mechanical shaft position sensor. An electrical machine is provided which comprises a stator and a rotor, the stator having one or more electrical windings wherein at least one electrical parameter of the windings has a cyclic variation related to rotor position; at least one control device for controlling supply of electrical current to or from the or each said electrical winding, and at least one rotor position sensor device for detecting at least one electrical signal related to the cyclic variation of at least one electrical parameter of the or each said electrical winding. In particular (fig.4), the machine has two stator windings, which are referred to as a field wind 104 and an armature winding 101. The sensed signal may correspond to the rate of change of current and flux in a winding. The disclosed sensing comprises the steps of measuring the said signal at least once during any part of a switching cycle and converting the signal to a ratiometric quantity representative of an estimate of the rotor position. |
