Permanent Magnet vs. Induction Motors

March 7, 2015

The low cost of induction or switched reluctance machines is attracting more and more companies to consider using them for high-speed, high-temperature generating applications. However, their use in such environments will bring about unique challenges and system level disadvantages that will keep permanent magnetic machines the overwhelming preferred choice in the industry. 

Topics discussed in this article include:

Air gaps between the rotor and stator, brush rings, circulating currents, cooling of the rotor, corrosive atmospheres, corrosives in the exhaust gas stream, directly driven turbo-generators, exhaust gas turbo compounders, flexible controls, flexible rotor aspect ratio, heat dissipation, high efficiency over a larger operating Speed And Power Range, High Power Density, High-speed Capability, High-speed Exhaust Gas Compounders, Hybrid Bearings, Impeller Vibrations To Housing And Vice Versa, Induction Machines, Laminated Rotors, Lower Inductance, Lower Magnetic Pull Force On Rotor, Motorgenerator Technologies, Operating Power Factor, Permanent Magnet Rotor, Permanent Magnet Versus Induction Machines, Permanent Magnetic Machines, Power Electronics, Rotordynamic Margins, Sparking Or Damaging The Bearings, Squirrel Cage Copper Windings, Switched Reluctance Machines, Tolerance To Larger Operating Air Gap Between Rotor And Stator, Torque Requirement, Turbo Impellers and Vibrations of a Typical Internal Combustion Engine.

Turbomachinery International