Permanent magnet motor

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

This type of motor can be used in the Chevy Bolt[1], the Chevy Volt, and the Tesla Model 3.[2] Additional Tesla versions use traditional induction motors motors.[3] Front motors in all-wheel drive Model 3 Teslas are also induction motors.

Long term magnet motors are better than induction electric motor or motors with field windings for several high-efficiency applications such as for example electric vehicles. Tesla’s Chief Engine agricultural Chain Designer was quoted talking about these advantages, stating: “It’s popular that permanent magnet machines have the benefit 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 seem sensible for variable-rate drive single-gear tranny as the drive devices of the cars. Therefore, as you know, our Model 3 has a long term magnet machine now. The reason being for the specification of the overall 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 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 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 a few motors, these magnets are installed with adhesive on the top of rotor core such that the magnetic field is usually radially directed over the surroundings gap. In other designs, the magnets are inset in to the rotor core surface 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 that provide magnetic flux to iron poles, which create a radial field in the air gap.

The primary application for permanent-magnet motors is in variable-speed drives where 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 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 velocity 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 machines in the rotor surface to supply starting capability. This kind of a motor will not, however, have method of managing the stator power element.