Permanent magnet motor

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

This kind of motor is utilized in the Chevy Bolt[1], the Chevy Volt, and the Tesla Model 3.[2] Various other Tesla models 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 motor or motors with field windings for certain high-efficiency applications such as electrical vehicles. Tesla’s Chief Engine Designer was quoted discussing 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 benefit for that. Induction devices have perfect flux regulation and for that reason you can optimize your efficiency. Both make sense for variable-acceleration drive single-gear transmitting as the drive devices of the cars. So, as you know, our Model 3 has a permanent magnet machine now. This is because for the specification of the functionality and efficiency, the permanent magnet machine better solved our cost minimization function, and it was optimal for the range and performance focus on. Quantitatively, the difference is usually what drives the future of the machine, and it’s a trade-off between motor price, range and battery cost that is Drive Chain determining which technology will be utilized in the future.
The magnetic field for a synchronous machine could be provided by using permanent magnets made of neodymium-boron-iron, samarium-cobalt, or ferrite on the rotor. In some motors, these magnets are mounted with adhesive on the surface of the rotor core such that the magnetic field is definitely radially directed across the air gap. In other styles, the magnets are inset in to the rotor core surface or inserted in slot machines just underneath the surface. Another type of permanent-magnet electric motor 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 main application for permanent-magnet motors is in variable-speed drives where the stator is supplied 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 motor drives, they are also highly efficient.

Permanent-magnet motors could be made to operate at synchronous quickness from a supply of continuous 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 supply starting capability. This kind of a motor does not, however, have method of managing the stator power element.


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