Development of a spiral magnet machine employing the torque magnification principle.

摘要

An evolving family of electric machines using the Torque Magnification (TM) Principle has attracted increasing interest in recent years. In this thesis, the TM principle is described following the introduction of the Specific Torque Density concept. A TM machine with flux concentration effect is presented, and its working principle explained. The performance and design considerations of the machine, which are common to most TM machines, are studied in detail. In addition, ceramic magnets are arranged in a spiral shape to achieve a high flux density by using the flux concentration effect. Test results taken on a hardware prototype machine prove the concept and confirm the machine's cost-effectiveness.