Views: 0 Author: Site Editor Publish Time: 2025-07-01 Origin: Site
A high-speed motor is an electric motor that operates at speeds generally higher than 10,000 rotations per minute (rpm), significantly surpassing the speeds of conventional motors. High-speed motor rotor assemblies are the central components of these motors, consisting of a rotor shaft, magnets, retention sleeves, and other structural elements, all designed to endure extreme rotational speeds, minimize energy losses, and ensure optimal performance under high mechanical and thermal stress.
During the operation of high-speed motors, the various components of the rotor are subjected to significant centrifugal forces. Since permanent magnets generally have low tensile strength, it is necessary to protect them with a retention sleeve to prevent damage. Common sleeve materials include high-strength metals such as Titanium alloys and Inconel alloys, as well as high-strength composites like carbon fiber and glass fiber.
Metal sleeves: These have good electrical conductivity, which can lead to substantial eddy current losses within the sleeve. However, they excel in thermal conductivity, facilitating effective heat dissipation from the rotor.
Composite sleeves: These have very low electrical conductivity, resulting in minimal eddy currents and energy losses. However, their poor thermal conductivity makes heat dissipation more challenging.
To mitigate high temperature rise in the permanent magnets caused by eddy current losses—which can reduce magnetic performance—it is possible to use laminated magnets produced with magnet segmentation technology or high-performance Samarium Cobalt magnets.
Our engineers collaborate with motor companies to optimize every aspect of high-speed motor rotor assemblies design. This includes the selection of shaft materials, magnets, adhesives, and retention sleeves, ensuring tailored solutions for each unique application.