A permanent magnet engine is a kind of brushless electric electric motor that uses permanent magnets instead of winding in the field.

This kind of motor can be used in the Chevy Bolt[1], the Chevy Volt, and the Tesla Model 3.[2] Various other Tesla versions 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 engine or motors with field windings for certain high-efficiency applications such as electric vehicles. Tesla’s Chief Motor Designer was quoted talking about these advantages, stating: “It’s popular that permanent magnet devices have the benefit of pre-excitation from the magnets, and therefore you have some efficiency advantage for that. Induction devices have ideal flux regulation and for that reason you can enhance your efficiency. Both seem sensible for variable-quickness drive single-gear transmitting as the drive devices of the cars. Therefore, as you know, our Model 3 has a long lasting magnet machine now. The reason being for the specification of the performance and efficiency, the long lasting magnet machine better solved our cost minimization function, and it had been optimal for the range and performance focus on. Quantitatively, the difference is what drives the continuing future of the device, and it’s a trade-off between motor price, range and battery price 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 made of 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 certainly radially directed across the air gap. In other styles, the magnets are inset in to the rotor core surface or inserted in slots just underneath the surface. Another kind of permanent-magnet motor offers circumferentially directed magnets placed in radial slots offering magnetic flux to iron poles, which create a radial field in the atmosphere gap.

The primary application for permanent-magnet motors is in variable-speed drives where in fact the stator comes from a variable-frequency, variable-voltage, electronically managed source. Such drives are capable of precise speed and placement control. Due to the lack of power losses in the rotor, in comparison with induction electric motor drives, also, they are highly efficient.

Permanent-magnet motors can be made to operate at synchronous velocity from a supply of continuous Drive Chain voltage and frequency. The magnets are embedded in the rotor iron, and a damper winding can be placed in slots in the rotor surface area to supply starting capability. This kind of a motor does not, however, have method of managing the stator power element.