A permanent magnet motor is a type of brushless electric engine that uses permanent magnets rather than winding in the field.

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

Long Auto Chain lasting magnet motors are better 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 discussing these advantages, stating: “It’s popular that permanent magnet machines 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 therefore you can improve your efficiency. Both seem sensible for variable-swiftness drive single-gear transmitting as the drive units of the cars. So, you may already know, our Model 3 includes a long lasting magnet machine now. This is because for the specification of the 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 certainly what drives the continuing 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 a few motors, these magnets are mounted with adhesive on the surface of the rotor core such 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 area or inserted in slot machine games just below the surface. Another type of permanent-magnet electric motor offers circumferentially directed magnets placed in radial slots offering magnetic flux to iron poles, which set up a radial field in the atmosphere gap.

The main application for permanent-magnet motors is in variable-speed drives where the stator comes 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, as compared with induction motor drives, also, they are highly efficient.

Permanent-magnet motors can be made to operate at synchronous rate from a way to obtain continuous voltage and frequency. The magnets are embedded in the rotor iron, and a damper winding is placed in slot machines in the rotor surface to supply starting capability. This kind of a motor does not, however, have means of managing the stator power factor.