The next step is where Cryo comes into play . Cryo spray is a specially formulated freezing agent designed to drop the standing temp of the stator, windings and magnets to -30°c ( depending on ambient temp ) in order to both increase power, as well as lengthen the operational envelope the motors can deliver peak power before heat soak causes power loss.
This sounds simple in theory, however many hurdles had to be overcome to allow the motors individual parts to cope with the high variances in operating temperature (from -30°to +30 °c or higher).
To achieve this many problems had to be overcome. Testing showed stators will de-laminate after several uses, due to the drastic temperature changes (because each stator lamination will shrink and expand at a different rate causing failure), In addition aluminium parts would shrink at a different rate to metal parts when the Cryo spray was applied, causing failure of the entire structure after very short use.