One challenge to operating large single-phase AC motors from the line is the starting current. The Problem with Line Feeding Single Phase Motors This article describes how that works and offers some considerations. However, it is possible to input a single-phase to a VFD and output variable voltage to a 3-phase induction motor. People often wanted to run the motors at reduced speeds so they asked, “Is it possible to add a VFD to my single phase motor?” In general, single-phase motors cannot be run with VFDs. We sold a lot of single-phase Farm Duty/Ag motors into these installations. The farm installations often didn’t have access to three-phase power and had to make do with single-phase 230V. Their applications ranged from running fans, pumps, elevators, agitators, augers, conveyors, etc. Being in the Midwest, we had a lot of farm and agricultural customers. My first job out of school was with a motor manufacturer providing technical support.
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