On 17/02/2018 13:25, The Natural Philosopher wrote:
On 17/02/18 13:12, Andy Burns wrote:
Tim+ wrote:

Given the huge environmental costs of rare earth element extraction its
maybe no bad thing that theyre not being used in the booming
electric car
market. If Tesla can manage without them I reckon thats good enough for
most of us.

Tesla are using rare-earth magnet motors in (some of?) their Model 3.

High strength magnets merely reduce the weight of the motor, You can get
as high flux densities and efficiences using electromagnets

Probably higher, but these take power, unless you're talking
superconductors?

In terms of energy, a magnet is 100% efficient at providing a magnetic
field.