| 摘要 |
A two-speed single phase motor of the capacitor-start type is disclosed wherein the motor is switched from the start condition to the run condition by means of a single contact centrifugally actuated switch. The motor comprises high speed and low speed main windings and a start winding employed in both the high speed and low speed configurations. A single pole single throw centrifugally actuated switch connected to the rotor has a single contact pair which opens when the motor exceeds a predetermined speed, and the same contact pair is used in both the high speed and low speed configurations. A relay comprising a coil in series with the centrifugal switch contacts has a pair of normally open contacts in series with the start capacitor so that when the centrifugal switch contacts open and interrupt the flow of current through the relay coil, the relay contacts will open thereby disconnecting the start capacitor from the circuit. A double throw selector switch having a high speed position and an alternative low speed position connects the centrifugal switch contacts and the relay coil in series either with the low speed main winding or the high speed main winding so that the low speed winding is disconnected upon reaching run conditions when the selector switch is in the high speed position, and the high speed main winding is disconnected upon reaching run conditions when the selector switch is in the low speed position. A run capacitor may be connected in series with the start winding, preferably in parallel with the start capacitor and the relay contacts.
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