What should i check when using a single-phase induction motor on a conveyor?

[Gary.H]

I’m trying to understand the practical limits of using a single-phase induction motor for a small conveyor system I’m prototyping. The motor starts fine under no load, but it seems to struggle and overheat when I try to move even a modest weight, and I’m not sure if the issue is the starting torque or if I’ve simply chosen the wrong type of motor for this constant load application.

[Chloe90]

Yeah I ran into something like that last winter. No load it spins up fine, but as soon as I added even a light belt load it bogged down and got really warm quickly. The current meter showed a big inrush that stayed high once it settled, and the motor never recovered torque as the load kept trying to move. I started to suspect the starting torque was the limiter, and once it stalled the heat kept ticking up.

[Ava.J]

From practical testing, single phase tends to be okay for light duty but not for a constant load with inertia. I tried with a small geared motor on a VFD (three phase drive) and it behaved a lot better. The startup torque was enough and the drive let it ramp up so it never self overheated. If you must stay with single phase, expect you’ll need a much larger motor or a capacitor start arrangement and careful cooling.

[Aaron_H]

I tried a capacitor start run arrangement on a small drum, and it helped the initial kick but the run current still climbed under load. The run winding heated up and I didn’t trust it to run long shifts. I think the cap size or the mechanical load didn’t match the motor, so I dropped it and went with a different motor.

[Riley70]

Is it possible the real bottleneck isn’t the motor but the rollers or belt alignment? A little misalignment or sticky bearings can make a big difference and pretend the motor is weak. I fiddled with tension and it seemed to help briefly, then it came back.