Compared with the motor stator, due to the special nature of the rotor part rotating, the rotor must have the performance of anti-deformation. For example, the rotor slot wedges and radial fixing of the winding ends of the wound rotor motor are to prevent the deformation problem during the operation of the motor; similarly, the wound rotor motor is not suitable for a high speed, which is also due to the limitation that the rotor is easy to deform.

Compared with wound-rotor motors, cage-type motors have much better rotor suitability and can meet the performance assurance requirements at almost any speed; however, there are also 2P cast aluminum rotor motors that have serious problems at the rotor ends similar to wound-rotor rotor shedding.

Compared with the above two types of rotors, the magnetic steel fixation of the permanent magnet motor rotor is the key point of quality control in the production and manufacturing of this type of motor. How to ensure the high-speed operation of the motor and even prevent the magnetic steel from falling off in the event of possible demagnetization has always been a technical issue in the development of permanent magnet motors. Conventional processes use fasteners and special glue for fixing, but there are always failure cases of magnetic steel falling off. Therefore, a carbon fiber rotor sleeve that can achieve both rotor insulation coating and mechanical enveloping was developed. The magnetic steel is wrapped with a carbon fiber sleeve, and a precise preload is applied to cover the sleeve and magnetic steel on the rotor surface. This can safely and effectively ensure the safe and stable operation of the rotor at high speeds.

In a case of remanufacturing a permanent magnet rotor of a motor, the stainless steel protective sleeve used was limited to varying degrees in terms of the rotor's industrial aesthetics and product performance. Carbon fiber rotors are made of carbon fiber composite materials and have the advantages of light weight, high speed, high efficiency, and corrosion resistance. They are widely used in new energy vehicles, aerospace, industrial robots and other fields. With technological breakthroughs, carbon fiber motor rotors will be more widely used in the future and become an important measure to improve motor technology.