| 摘要 |
A motor is disclosed that is particularly adapted for energization from a single phase power source and that includes a magnetic core having uniformly sized and spaced slots as well as three different winding phases. In one illustrated form, the motor winding circuit includes sub-circuits in the form of a primary phase winding, an intermediate phase winding, and a capacitor phase winding with the different winding phases positioned on the core so that the space angle between the effective centers of poles (or coil groups) of next adjacently located winding phases is sixty electrical degrees. Also disclosed are procedures by which an initial ratio of effective conductors (or turns) in the capacitor phase to effective conductors in the main phase can be calculated as well as an initial ratio of effective conductors in the intermediate phase to those in the primary phase. Design criteria vis-a-vis the sizes of conductors in the three different winding phases are described whereby substantially balanced operation will result when a capacitance, preselected to be across the capacitor phase winding, coincides with that of commonly available or off-the-shelf capacitors. The motor winding circuit also comprises a sub-circuit including an additional winding section that is provided so that multi-speed operation may be achieved. It is preferred to maintain substantially uniform slot fill (or slot space factors) in each of the uniformly sized slots by physically positioning the conductors for such additional winding section in core slots that are also occupied by the intermediate phase winding. Utilization of the invention results in higher operating efficiencies as compared to present "state of the art" motors - and more particularly when utilized as four-pole, six-pole, etc. motors which may generally be characterized as "conductor starved". |
