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Method and apparatus for starting capacitive start, induction run and capacitive start, capacitive run electric motors
Method and apparatus for starting capacitive start, induction run and capacitive start, capacitive run electric motors
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机译:用于启动电容性启动,感应运行和电容性启动,电容性运行电动机的方法和设备
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摘要
A solid state starting system for electric motors having main and auxiliary windings of the capacitor start induction run and capacitor start-capacitor run types uses a triac serially connected to the auxiliary winding. The system differentially measures the auxiliary winding voltage and provides a triac gate signal when in the START mode. When the auxiliary voltage reaches a calibratable cut-out voltage the triac is disabled until the auxiliary winding voltage decreases to a level below a calibratable cut-in voltage. The slope of the percent motor speed cut-out versus percent line voltage is calibratable to permit compensation for variations in line voltage. The triac can be directly driven or driven through an optically coupled interface having a triac output (OCI).
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