| 摘要 |
A control circuit for an electric motor adapted for operation in three speed modes and having a winding circuit with three main windings serially connected together in circuit relation therein adapted for connection in three different speed mode effecting combinations across a power source. The control circuit has means for rendering two of the windings effective in the winding circuit and alternatively rendering all three of the windings effective in the winding circuit. A device is operable generally in response to different preselected temperature conditions for respectively coupling one of the two windings and both of the two windings across the power source when the two windings are rendered effective in the winding circuit thereby to effect the operation of the motor in two different ones of the speed modes thereof and for also coupling the three windings across the power source when the three windings are rendered effective in the winding circuit thereby to effect the operation of the motor in the third different speed mode thereof.
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