Resistance start for HV motors

[Deansharafi]

What are the benefits (other than controled voltage start-up)and how can a set of staged resistances can be calculated for HV motor starting. Any reading materials?
Cheers!

 

[jbartos]

Suggestion: Reference:
M.G. Say "Alternating Current Machines," John Wiley & Sons, 1978,
Page 286
Stator Impedance Starting
Impedance or Resistance can be used at small machines; however, star-delta switch may be cheaper and may give a better starting torque.