In January, Professor Haran’s group visited Johnson Controls (JCI) where they met with engineering leads on their jointproject,“Development of High Efficiency Compressor Motor Design Project – Phase I Summary and Phase II Launching.”
JCI is to provide specifications on the number of speed cycles, fatigue life, windage loss-model validation, and cooling results: scaling down the thermals from sample shown for the prototype, along with best estimates in rotor average/max temperature, copper average/max temperature, and shaft size: possible reduction on shaft diameter in rotor to get more space for rotor slots.
Kiruba’s group is to work on scalability of the designs, and return with a detailed plan that takes into account the impact of the air gap and switching frequency.
The compressor they are designing for is a part in the chiller (above). The chiller in active use supplies chilled water (6–12 °C) to the building.