speed control of ac motor unit

Specification: Model: UX-52 Input Voltage: AC 220V 50Hz Power: 400W Output Speed: 0-1450rpm Speed Adjustable R

AC Motor Speed Controller, AC220V 400W Stepless Motor Governor, Adjustable Speed Regulator, with Speed Control Knob

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US-52 AC speed motor controller regulated speed forword backword controller 400W frequency conversion

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400W AC 220V 50Hz 60Hz Mini Motor Speed Control Unit Speed Pinpoint AC Motor Speed Controller Regulator Forward And Backward - AliExpress