High power permanent magnets machines in electric propulsion systems

摘要

Recent developments in high torque low speed direct drive motors have overcome many of the earlier problems related to excessive size and weight. The renewal of interest in this type of drive is largely the result of advances in power electronics and permanent magnet technology. After remaining static for many decades, the design of electric motors and drives is now undergoing something of a revolution. Permanent magnet motors are now capable of delivering a high torque from a relatively small frame size. These new motors are increasingly being used in marine propulsion systems and on-board actuators where the requirements for small size, high reliability and reduced noise emissions are especially demanded.