There are a few forms of (1ph) induction motors, some do not control well.Everyday Practical Electronics Jan 2019 published an induction motor controller project.
It explains a fair bit about how IMs work and might help the TS.
CBA reading all of it - they explain that you can't control them well buy just varying the voltage, its better to vary frequency - but there's a gotcha.There are a few forms of (1ph) induction motors, some do not control well.
What versions do they propose?
Max.
Its probably escaped into the wild by now - the PDF might be floating around the web somewhere.Sounds like the article is a little misleading if they don't state the motor technology type.
Anything over 0.5hp has a problem with both phase angle and frequency control. Usually relegated to fans etc.
This is why most DIY'ers use a 1ph/3ph VFD and a 3phase motor for reliability in power applications.
Max.
Going to have think of something else then.Generally neither simple or involved ways work, VFD's (frequency) have been attempted but are not very successful for 1ph, especially a motor that starts on load.
As I mention in #4, the preference is to use a 1ph-in VFD and a 3 ph motor.
Max.
Appreciate your helpThe capacitors are selected for optimum starting, if changing them you may run into motor issues.
Max.
Just thinking out loud: - you can get comtinuously variable ratio gearboxes (probably seriously expensive). Have something like a clock spring type arrangement pulling the adjuster shaft round to the highest reduction. Use a ball weight governer like they had on stationary stem engines to operate the adjustment shaft - the motor starts on minimum torque - it should also stop cranking up the adjuster if the torque gets too high as it runs up to speed.If it starts under load, is there a way you could unload it with a by-pass valve and timer?
Max.
To be honest, I'm sick of the bloody thing. Have probably spent enough time/money on it; had to replace hall sensors (genuinely irritated by the cost of these for the pump, surely they pretty cheap to produce), fix a leak, redo my piping. Just thought there may be an easy solution, my dad mentioned they had soft starters on loads of his machines at work.Just thinking out loud: - you can get comtinuously variable ratio gearboxes (probably seriously expensive). Have something like a clock spring type arrangement pulling the adjuster shaft round to the highest reduction. Use a ball weight governer like they had on stationary stem engines to operate the adjustment shaft - the motor starts on minimum torque - it should also stop cranking up the adjuster if the torque gets too high as it runs up to speed.
If these are industrial motors, most likely 3ph, For which there are 3ph soft start, electronic contactors., my dad mentioned they had soft starters on loads of his machines at work.
Yeah probably, I did see some wildly expensive solutions when searching. At least wildly by my domestic needs; I guess if it saves you an industrial motor they are cheapIf these are industrial motors, most likely 3ph, For which there are 3ph soft start, electronic contactors.
What was the function of the hall sensors?
Max.
by Duane Benson
by Duane Benson
by Duane Benson
by Aaron Carman