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Does this mean that if the load inertia is constant (which it is) and comparatively large compared to the motor's own inertia (which it is), then the motor will follow a slowly increasing supply frequency, and once that frequency is constant, the motor speed will be comnstant too? As I said, I...

Thanks, Benta. This is the sort of I nformation I need. Is fitting a sensor circuit likely to be practicable, do you think?

Mike, you have it in a nutshell. My problem now is to find out from those who know it can't be done how to do it!

Well Skogsgurra, I certainly hope so! Any chance of further details, Nbucska? What wasn't difficult for you could be very difficult for me: we each have our own expertise.

Ah. Apologies. Should I bow out and seek information elsewhere? I wouldn't want to break your rules.

What sort of motor would you reommend? Conventionally, a small very low power 12-pole synchronous motor is used, running at around 300 rpm and driving through a rubber belt. I want to go back to the type wich was popular in the 50s, usng a more powerful (100 watts or so) faster revving motor...

No, it's just a hobby at the moment. However, i'm currently unemployed, so it may develop into something more if my experiments turn out succesfully!

I am an electronic ignoramus. I wish to use a motor such as this http://www.hobby-lobby.com/brushless-axi2204.htm for a hifi turntable. These motors are primarily aimed at the radio control aircraft hobby market, so the only controllers I can find are for use with R/C systems. Can anyone suggest...