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A permanent magnet motor is a kind of brushless electric engine that uses long lasting 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] 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 several high-efficiency applications such as electrical vehicles. Tesla’s Chief Electric motor Designer was quoted discussing these advantages, stating: “It’s well known that permanent magnet devices have the advantage of pre-excitation from the magnets, and for that reason you involve some efficiency advantage for that. Induction devices have ideal flux regulation and therefore you can improve your efficiency. Both make sense for variable-velocity 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. It is because for the specification of the functionality and efficiency, the long term magnet machine better solved our cost minimization function, and it was optimal for the number and performance target. Quantitatively, the difference is definitely what drives the continuing future of the machine, and it’s a trade-off between motor cost, range and battery price that is identifying which technology will be utilized in the future.
The Stainless Steel Chain magnetic field for a synchronous machine may be provided by using long lasting magnets manufactured from neodymium-boron-iron, samarium-cobalt, or ferrite on the rotor. In a few motors, these magnets are mounted with adhesive on the top of rotor core in a way that the magnetic field is certainly radially directed over the surroundings gap. In other styles, the magnets are inset into the rotor core surface area or inserted in slot machines just below the surface. Another form of permanent-magnet electric motor has circumferentially directed magnets placed in radial slots offering magnetic flux to iron poles, which in turn set up a radial field in the surroundings gap.

The primary application for permanent-magnet motors is in variable-speed drives where in fact the stator is supplied from a variable-frequency, variable-voltage, electronically controlled 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 engine drives, also, they are highly efficient.

Permanent-magnet motors can be designed to operate at synchronous quickness from a way to obtain constant voltage and frequency. The magnets are embedded in the rotor iron, and a damper winding is placed in slot machines in the rotor surface area to provide starting capability. This kind of a motor will not, however, have method of managing the stator power factor.