Is the motor controlled by a VFD? I have never heard the term 'hunt' associated with motor starting. Are you saying the motor does not come up to speed in the time you expect? Some VFDs have a paramter to allow starting a motor while it is turning, on AB drives this is called 'flying start'. Without it, the drive assumes the motor is not turning and attempts to ramp up the motor speed from a stopped state. If the motor is actually turning due to inertia or external input, bad things can happen when the drive comes on. The 'flying start' option causes the drive to seek the motor speed before applying power which causes a delay, sometimes lengthy, to the starting process.
Oscillating perhaps? What I have seen on large motors that people attempt to start with some inexpensive Reduced Voltage Solid State Starters is that their source is not stiff enough, so the starting current of that large motor causes a severe voltage drop, which then causes a loss of torque, which makes the motor stop accelerating, but not a total stall so it hovers there, oscillating until something trips. Better solid state starters will have what's called an "anti-oscillation" feature that detects this and forces the starter to compensate.
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
Without more information we are all guessing. If it's a solid state device of some sort, you can get up against the current limit, which will affect steady operating speed too.
You have asked a very vague and almost unanswerable question...
It would be much more helpful if you were to do such things as describe the type of HV motor under consideration, its duty, the nature and robustness of the power system supplying it, its starting method, and so forth. Until then, you should not expect to receive answers worthy of the name.
More information = better answers!
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
I saw a motor yesterday that was not only old enough to smoke, it was so old that it would likely die of old age before it suffered smoke induced cancer. grin
Bill
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"Why not the best?"
Jimmy Carter
(For the non-Americans out there, we have a common colloquial expression for an idea or proposal that will not be considered, saying "That dog won't hunt".)
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
