RE: Just the US requirement/ambition19 Oct 2021 15:24
Fulmar,
Your assessment is correct. In both the case of a generator and motor, the stator (stationary outside section) has electricity flowing to create a magnetic field. there is indeed copper here that allows the electricity to flow. So yes an exciter based generator and an induced motor has more copper within it than that of a corresponding permanent magnet unit. With copper rising to over USD10,500 per tonne there will be balancing act by operators and manufacturers to optimise the most cost efficient method. The auto manufacturers do not want to held to ransom and will be concerned about the supply chain, if they all move solely to the REE technology, hence why a number are using/planning to use induced motors. They will pay a price in range, efficiency, weight, battery storage... Should the US, EU and RoW create a sizable REE industry then auto manufactures may switch over to the permanent magnet based propulsion motor.
Phantom is also correct and the easiest and most efficient route is the REE pathway.