"auto boost" and "torque boost"difference in AC Induction Mo
"auto boost" and "torque boost"difference in AC Induction Mo
(OP)
What is difference between "auto boost" and "torque boost" during AC Induction motor start? If the motor has no load, is that possible to make the motor work at low speed range, say under 10hz?
Thanks!
Thanks!





RE: "auto boost" and "torque boost"difference in AC Induction Mo
RE: "auto boost" and "torque boost"difference in AC Induction Mo
I actually want to understand more about the motor starting process which has "auto boost" and "voltage boost".
thanks!
RE: "auto boost" and "torque boost"difference in AC Induction Mo
Many (most) vector control schemes overcome the problem with low torque at low frequencies. It is only when you have a scalar system (constant V/Hz) that you have a problem with frequencies below about five Hz. And that's why you add some boost to compensate for resistive voltage drop in the motor windings.
I do no know what "auto boost" is. Perhaps some manufacturer's trade name for slip compensation? Also only used in scalar controls. The latter is not used much these days.
Reduced cooling is sometimes a problem also when there is no load on the shaft. Especially with motors with high magnetizing current. But, usually motors can run unloaded at low speed without problems.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: "auto boost" and "torque boost"difference in AC Induction Mo
Even then the user's manual isn't always fully descriptive of how the drive software implements this particular VFD feature, especially on the more obscure parameters. Then you need to contact the manufacturer's representative in order to get a more detailed explanation.