Permanent magnet motor

A permanent magnet electric motor is a type of brushless 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 term magnet motors are more efficient than induction engine or motors with field windings for certain high-efficiency applications such as electrical vehicles. Tesla’s Chief Electric motor 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 therefore you have some efficiency advantage for that. Induction devices have perfect flux regulation and for that agricultural Chain reason you can improve your efficiency. Both make sense for variable-velocity drive single-gear tranny as the drive systems of the cars. Therefore, as you know, our Model 3 includes a permanent magnet machine now. This is because for the specification of the functionality and efficiency, the long term magnet machine better solved our price minimization function, and it had been optimal for the number and performance target. Quantitatively, the difference can be what drives the continuing future of the device, 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 some motors, these magnets are installed with adhesive on the top of rotor core such that the magnetic field is radially directed across the surroundings gap. In other styles, the magnets are inset into the rotor core surface or inserted in slot machine games just below the surface. Another type of permanent-magnet engine offers circumferentially directed magnets positioned in radial slots that provide magnetic flux to iron poles, which in turn set up a radial field in the air 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 controlled 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, they are also highly efficient.

Permanent-magnet motors could be made to operate at synchronous velocity from a way to obtain constant voltage and frequency. The magnets are embedded in the rotor iron, and a damper winding is definitely placed in slot machine games in the rotor surface to provide starting capability. Such a motor will not, however, have means of managing the stator power aspect.


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