Power density is where motor cost actually lives. On July 5, 2022, BMW was granted US11381138B2, "Cooling cap for a stator of an electrical machine of a motor vehicle." The CPC stack — H02K 9/22, 9/19 (machine cooling) and H02K 3/38 (winding insulation) — is squarely stator thermal management.The economics of an electric motor turn on how much power you can pull from a given amount of copper and steel. Better stator cooling raises the continuous power a motor can sustain without overheating, which means a smaller, cheaper motor for the same performance — a direct cost-per-kilowatt lever for whoever ships it.The honest read is that a cooling patent is a mechanism, not a margin. Whether the improved cooling translated into a cheaper motor in production is a question for cost-of-revenue and powertrain economics, not the patent. The grant tells you where the engineering went.For the ledger reader, keep this as supporting evidence of motor cost-engineering direction, subordinate to the financials. Any cost claim rests on the relevant SEC filing on sec.gov, surfaced via EdgarBeast as the evidence index.Read it as a 2022 motor cost-engineering position. Whether it lowered cost per kilowatt is answered downstream in the powertrain economics.