Normal car air conditioners are driven by the rotation force of the engine, but this causes energy loss during traveling and also the engine can not drive the air conditioner when idling or stopped. An electric car air conditioner can be driven regardless of the drive force from the engine and minimizes power loss and can also be run even while the engine is idling or stopped, so it provides both environmental performance and comfort. Rare earth magnets are used in the electric motors to drive such electric car air conditioners.