A permanent magnet engine is a kind of brushless electric electric motor that uses long lasting 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 motor or motors with field windings for several high-efficiency applications such as for example electrical vehicles. Tesla’s Chief Engine Designer was quoted discussing these advantages, stating: “It’s well known that permanent magnet machines have the advantage of pre-excitation from the magnets, and for that reason you have some efficiency benefit for that. Induction devices have perfect flux regulation and for that reason you can enhance your efficiency. Both seem sensible for variable-rate drive single-gear transmitting as the drive systems of the cars. Therefore, as you know, our Model 3 includes a long term magnet machine now. It is because for the specification of the efficiency and efficiency, the long lasting magnet machine better solved our price minimization function, and it had been optimal for the range and performance target. Quantitatively, the difference is certainly what drives the continuing future of the machine, and it’s a trade-off between motor price, range and battery cost that is identifying which technology will be used in the future.
The magnetic field for a synchronous machine could be provided by using long lasting magnets manufactured from neodymium-boron-iron, samarium-cobalt, or ferrite on the rotor. In some motors, these magnets are mounted with adhesive on the top of rotor core in a way that the magnetic 
field is radially directed over the surroundings gap. In other designs, the magnets are inset into the rotor core Stainless Steel Chain surface or inserted in slot machines just underneath the surface. Another form of permanent-magnet motor has circumferentially directed magnets positioned in radial slots that provide magnetic flux to iron poles, which set up a radial field in the surroundings gap.
The primary application for permanent-magnet motors is in variable-speed drives where the stator is supplied from a variable-frequency, variable-voltage, electronically controlled source. Such drives can handle precise speed and placement control. Due to the lack of power losses in the rotor, in comparison with induction engine drives, they are also highly efficient.
Permanent-magnet motors could be designed to operate at synchronous acceleration from a supply of continuous voltage and frequency. The magnets are embedded in the rotor iron, and a damper winding can be placed in slot machine games in the rotor surface area to provide starting capability. This kind of a motor does not, however, have method of managing the stator power aspect.