A Transmission Chain permanent magnet engine is a kind of brushless electric motor that uses long term 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 models 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 electric vehicles. Tesla’s Chief Electric motor Designer was quoted talking about these advantages, saying: “It’s popular that permanent magnet devices 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 for that reason you can optimize your efficiency. Both make sense for variable-rate drive single-gear transmission as the drive models of the cars. So, you may already know, our Model 3 includes a long lasting magnet machine now. It is because for the specification of the performance and efficiency, the long term magnet machine better solved our cost minimization function, and it had been optimal for the number and performance focus on. Quantitatively, the difference is what drives the continuing future of the device, and it’s a trade-off between motor price, range and battery price that is identifying 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 a few motors, these magnets are mounted with adhesive on the top of rotor core such that the magnetic field can be radially directed across the atmosphere gap. In other designs, the magnets are inset in to the rotor core surface area or inserted in slot machines just underneath the surface. Another type of permanent-magnet motor provides circumferentially directed magnets positioned in radial slots that provide magnetic flux to iron poles, which in turn set up a radial field in the atmosphere 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 can handle precise speed and placement control. Because of the absence of power losses in the rotor, in comparison with induction electric motor drives, they are also highly efficient.

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