Does the lift manufacturers single phase motor use a continuous rated start winding without a centifugal switch that would switch it out of circuit once the motor has started on most single phase motors
Your motor sounds like it only has a start duty winding that is switched out of circuit and once the load increases on the motor it stalls as the start ( direction ) winding is no longer in circuit and therefore not providing the torque that your lift requires
You will need to check the exact spec of the lift manufacturers motor I would think this has continous rated start winding that will overcome the stall that you are experiencing under load
Your motor sounds like it only has a start duty winding that is switched out of circuit and once the load increases on the motor it stalls as the start ( direction ) winding is no longer in circuit and therefore not providing the torque that your lift requires
You will need to check the exact spec of the lift manufacturers motor I would think this has continous rated start winding that will overcome the stall that you are experiencing under load
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