Permanent magnet motor

A permanent magnet electric motor is a type of brushless electric motor that uses long lasting Transmission Chain 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] 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 more efficient than induction engine or motors with field windings for certain high-efficiency applications such as electric vehicles. Tesla’s Chief Engine 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 involve 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-speed drive single-gear tranny as the drive products of the cars. Therefore, as you know, our Model 3 includes a permanent magnet machine now. This is because for the specification of the efficiency and efficiency, the long term magnet machine better solved our price minimization function, and it was optimal for the range and performance focus on. Quantitatively, the difference is definitely what drives the continuing 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 may be provided by using permanent magnets manufactured from 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 atmosphere gap. In other styles, the magnets are inset into the rotor core surface or inserted in slot machine games just below the surface. Another form of permanent-magnet engine has circumferentially directed magnets positioned in radial slots that provide magnetic flux to iron poles, which in turn create 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. Due to the lack of power losses in the rotor, as compared with induction electric motor drives, they are also highly efficient.

Permanent-magnet motors could 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 machine games in the rotor surface area to provide starting capability. Such a motor will not, however, have means of managing the stator power element.


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