| 摘要 |
A switched reluctance motor, providing rotor position detection, including at low speeds, without a rotor shaft position sensor, comprises a rotor mounted for rotation about a rotor shaft axis and including a central hub having a number of circumferentially spaced rotor poles extending radially outwardly from the hub; a stator surrounding the rotor and having at least three circumferentially spaced stator poles and at least three electrically isolated coils wound around the respective stator poles to form three electrically independent stator phases; an electrical energy source, and energizing device for selectively energizing the phases in succession with a run current to generate a torque on the rotor and thereby rotate the rotor such that when one of the stator phases is energized to cause rotation of the rotor at a given moment. The other of the stator phases are not energized with the run current at the given moment, the energizing device including a number of phase switches connected between the phases and the energy source for selectively electrically connecting the energy source to the phases, a switch operating device connected to the switches for selectively operating the switches, a current sensing device for sensing the amount of current in each of the phases, a timing device connected to the current sensing device and to the switch operating device for determining the amount of time for the current in each phase to reach a predetermined current level threshold; a pulse device connected to the switch operating device and to the timing device for periodically selectively operating the switch operating device for a limited time to energize the unenergized phases with a seek current without generating torque on the rotor; a comparing device connected to the timing device for comparing the amount of time that current in each of the unenergized phases took to reach the predetermined current level threshold; and a run device connected to the comparing device and the switch operating device for switching on a selected one of the switches to rotate the rotor. |
