Quoted from pins4u:

How about ditch this (obviously POOR) idea and go back to the tried and proven two windings idea that WMS perfected over many years and hundreds of thousands of machines.
I'm talking about pulsing a single winding which is the root cause of this problem and, basically, cannot be overcome as the basic idea is flawed from the start.
A pull winding does the heavy lifting and the hold winding is designed EXACTLY for this purpose.
This whole pulsed coil thing is for one reason only - more profit - but it results in electrical problems that we are all seeing and trying to resolve by adding patches (fans etc). This problem will NEVER be resolved while these manufacturers keep using a single winding coil.