In the time between Robert Cole’s patent and the state of the industry described by Co Huynh, permanent magnet motors have become ubiquitous in advanced machines. As engineers design equipment for demanding environments, they value the high torque, high efficiency, and low maintenance requirements of permanent magnet motors. Magnet retention remains a challenge, particularly as performance demands continue to escalate.
For now, leading manufacturers will offer metallic sleeves in materials such as 300 CRES stainless steel, A286 iron-nickel-chromium alloy, and Inconel superalloys—and in thermoplastic, thermoset, and high-strength carbon fiber, according to the requirements of each machine design.
- Properties of Magnetic Materials
- Surface and Interior Mounting
- Evolution of Design
- Magnet Retention Slots
- Magnet Retention Wedges
- Magnet Retention Sleeves