永磁电机

A permanent Auto Chain magnet motor is a kind of brushless electric motor that uses long term magnets rather than winding in the field.

This type of motor can be used in the Chevy Bolt[1], the Chevy Volt, and the Tesla Model 3.[2] Various other Tesla models use traditional induction motors motors.[3] Front motors in all-wheel drive Model 3 Teslas are also induction motors.

Long term magnet motors are better than induction engine or motors with field windings for several high-efficiency applications such as electric powered vehicles. Tesla’s Chief Motor Designer was quoted discussing these advantages, saying: “It’s well known that permanent magnet devices have the benefit of pre-excitation from the magnets, and therefore you involve some efficiency benefit for that. Induction devices have ideal flux regulation and for that reason you can improve your efficiency. Both make sense for variable-velocity drive single-gear tranny as the drive products of the cars. Therefore, as you know, our Model 3 includes a long term magnet machine now. The reason being for the specification of the overall performance and efficiency, the long term magnet machine better solved our price minimization function, and it was optimal for the number and performance target. Quantitatively, the difference is usually what drives the future of the machine, and it’s a trade-off between motor cost, range and battery cost that is determining which technology will be used in the future.
同步电机的磁场可以通过在转子上使用钕硼铁、钐钴或铁氧体制成的永磁体来提供。在某些电机中，这些磁体用粘合剂安装在转子铁芯表面，使磁场可以沿径向穿过周围间隙。在其他类型中，磁体被嵌入转子铁芯表面或插入表面正下方的老虎机中。另一种永磁电机是将沿周向方向的磁体放置在径向槽中，这些磁体向铁极提供磁通量，进而在气隙中产生径向场。