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] Various other 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 electric motor or motors with field windings for certain high-efficiency applications such as for example electrical vehicles. Tesla’s Chief Motor Designer was quoted discussing these advantages, saying: “It’s well known that permanent magnet devices have the advantage of pre-excitation from the magnets, and therefore you have some efficiency benefit for that. Induction devices have ideal flux regulation and for that reason you can enhance your efficiency. Both make sense for variable-speed drive single-gear transmission as the drive devices of the cars. Therefore, you may already know, our Model 3 has a permanent 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 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 cost, 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 term magnets manufactured from 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 radially directed across the air flow gap. In other designs, 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 positioned in radial slots that provide magnetic flux to iron poles, which set up a radial field in the air flow gap.

The main application for permanent-magnet motors is in variable-speed drives where the stator comes from a Conveyor Chain variable-frequency, variable-voltage, electronically controlled source. Such drives are capable of precise speed and placement control. Because of the lack of power losses in the rotor, in comparison with induction engine drives, also, they are highly efficient.

Permanent-magnet motors can 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 usually placed in slot machine games in the rotor surface to supply starting capability. Such a motor will not, however, have method of controlling the stator power aspect.