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Single-phase motor reactor buck speed control ​&am

2015-03-01 05:56  
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Single-phase motor reactor buck speed control ​​Circuit
As shown in figure, the reactor is connected to the single-phase motor supply circuit in series, and the buck governor is realized by switching reactor coil tap. When the governor switch SA is set to the I , the main winding LR and reactor L is cascaded to power supply, the power supply voltage will be landed on the entire coil of the reactor L, and thus the voltage of main winding LR reduces, then the field generated by LR is weakening, the slip of the motor increases, the speed is significantly reduced; SA is set to Ⅲ , the main windingoperates under the rated voltage, the speed will be the highest; SA is set to II , it has the medium speed.