What is the minimum cycle time for a starter?
When the power is stopped to the motor, the field starts to collapse. Remember this takes a certain amount of time. For that very brief moment; there is some CEMF at the motor terminals. Even though it is decaying just like a standard inductive circuit. Heres the problem of two short of cycle time. When power is re-applied, the incoming power can actually be out of phase with the collapsing field. The in-rush current can be at twice the LRA (600% FLA on start-up, up to 1200% in this worse case scenario.) Of course the above example is a worse case scenario, the stress on the windings and the mechanical stresses that can occur out way the benefits of cycling too fast. You should find out how long the time constant lasts for the particular motor in your project and give it at least 6-10 times the amount. Refer to NEMA MG-1 defines the open circuit AC time constant.
