A permanent magnet motor is a type of brushless electric engine that uses permanent Auto Chain magnets instead of winding in the field.
This type of motor is utilized in the Chevy Bolt[1], the Chevy Volt, and the Tesla Model 3.[2] Additional Tesla models use traditional induction motors motors.[3] Front motors in all-wheel drive Model 3 Teslas are also induction motors.
Long lasting magnet motors are more efficient than induction motor or motors with field windings for certain high-efficiency applications such as electrical vehicles. Tesla's Chief Motor Designer was quoted talking about these advantages, stating: “It's popular that permanent magnet machines have the benefit of pre-excitation from the magnets, and for that reason you involve some efficiency advantage for that. Induction machines have perfect flux regulation and therefore you can optimize your efficiency. Both make sense for variable-quickness drive single-gear transmission as the drive models of the cars. Therefore, as you know, our Model 3 has a long term magnet machine now. This is because for 
the specification of the performance and efficiency, the permanent magnet machine better solved our price minimization function, and it was optimal for the number and performance focus on. 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 utilized in the future.
The magnetic field for a synchronous machine may be provided by using permanent magnets made of neodymium-boron-iron, samarium-cobalt, or ferrite on the rotor. In some motors, these magnets are installed with adhesive on the top of rotor core in a way that the magnetic field is definitely radially directed over the air flow gap. In other styles, the magnets are inset into the rotor core surface or inserted in slots just below the surface. Another form of permanent-magnet engine offers circumferentially directed magnets positioned in radial slots offering magnetic flux to iron poles, which create 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 managed source. Such drives can handle precise speed and placement control. Because of the absence of power losses in the rotor, in comparison with induction electric motor drives, also, they are highly efficient.
Permanent-magnet motors could be designed to operate at synchronous velocity from a way to obtain continuous voltage and frequency. The magnets are embedded in the rotor iron, and a damper winding is definitely placed in slot machines in the rotor surface to supply starting capability. Such a motor does not, however, have means of managing the stator power element.