| 摘要 |
A single phase motor is disclosed which comprises a stator assembly having a main winding, a start winding and an auxiliary winding wherein the start and auxiliary windings are connected in two alternative configurations during start and run conditions, respectively. During the start condition, the start and auxiliary windings are interconnected by a series connection which causes current to flow through the auxiliary winding in a reverse direction to the flow through the start winding so that there exists a bucking magnetic relationship between the fields in the start and auxiliary windings. During the run condition of the motor, however, the start and auxiliary windings are interconnected by a second series electrical connection which causes the current to flow through the auxiliary winding in a direction opposite the first direction so as to cause the magnetic fields in the start and auxiliary windings to be in an aiding relationship thereby improving motor operating efficiency. In one embodiment, the auxiliary winding is formed as a single coil for each of the poles of the motor, and these coils are disposed within respective slot pairs. In another embodiment, the auxiliary winding is distributed in all of the slots occupied by the start winding so as to obtain better start winding harmonics and lower end turn factor. End turn factor is a measure of the tightness at the end turns and is the ratio of the end turn conductor cross sectional area to the area available for the end turns.
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