A permanent magnet electric motor is a type of brushless electric electric motor that uses long lasting magnets instead of winding in the field.
This kind of motor is used in the Chevy Bolt[1], the Chevy Volt, and the Tesla Model 3.[2] Other Tesla versions use traditional induction motors motors.[3] Front motors in all-wheel drive Model 3 Teslas are also induction motors.
Permanent magnet motors are more efficient than induction motor or motors with field windings for several high-efficiency applications such as for example electric vehicles. Tesla’s Chief Electric motor Designer was quoted talking about these advantages, stating: “It’s well known that permanent magnet devices have the benefit of pre-excitation from the magnets, and therefore you have some efficiency benefit for that. Induction machines have ideal flux regulation and for that reason you can improve your efficiency. Both make sense for variable-rate drive single-gear tranny as the drive systems of the cars. Therefore, as you know, our Model 3 has a permanent magnet machine now. This is because for the specification of the efficiency and efficiency, the long lasting magnet machine better solved our price minimization function, and it 
was optimal for the range and performance target. Quantitatively, the difference is what drives the future of the device, and it’s a trade-off between motor price, range and battery price that is determining which technology will be utilized in the future.
The Stainless Steel Chain magnetic field for a synchronous machine could 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 surface of the rotor core such that the magnetic field is definitely radially directed across the air gap. In other styles, the magnets are inset into the rotor core surface or inserted in slots just below the surface. Another type of permanent-magnet motor has circumferentially directed magnets positioned in radial slots offering magnetic flux to iron poles, which in turn setup a radial field in the surroundings gap.
The main application for permanent-magnet motors is in variable-speed drives where in fact the stator is supplied from a variable-frequency, variable-voltage, electronically managed source. Such drives can handle precise speed and position control. Because of the absence 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 way to obtain continuous voltage and frequency. The magnets are embedded in the rotor iron, and a damper winding is certainly placed in slot machine games in the rotor surface to supply starting capability. This kind of a motor will not, however, have means of managing the stator power element.