Wrapped interior permanent magnet (IPM) synchronous motors represent a recent breakthrough in the domain of high-speed IPM machines. This innovative rotor design, pioneered by Tesla, Inc. in the Model S Plaid electric vehicle, introduces buried permanent magnets (PMs) and a carbon-fiber (CF) sleeve to secure the magnets against centrifugal forces, obviating the need for traditional iron bridges typical in conventional IPM rotor configurations. Inspired by surface-mounted PM (SPM) rotors, this wrapping technique has the potential to transcend existing speed limitations, as Tesla attests to achieving speeds surpassing 20,000 RPM with this cutting-edge motor. Nevertheless, the design and analysis of retaining sleeves are essential for enabling safe and efficient high-speed operation.