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Modern Permanent Magnet Electric Machines
The late 1980s saw the beginning of the PM brushless machine era, with the invention of high-energy density permanent magnets (PM) and the development of power electronics. Although induction motors are now the most popular electric motors, the impact of PM brushless machines on electromechanical drives is significant. Today, PM machines come second to induction machines. Replacement of electromagnetic field excitation systems by PMs brings the following benefits: No electrical energy is absorbed by the field excitation system and thus there are no excitation losses, causing substantial increase in efficiency Higher power density (kW/kg) and/or torque density (Nm/kg) than electromagnetic exc...
Sword Stirs the World
The Divine Lands' calamity, the chaotic world, and so many tyrants and tyrants. An ordinary youth who wanted to play this game had unexpectedly obtained a unique book, cultivated peerless martial arts, defeated all sorts of masters, and even wrote a legend in his life. Then, was it a rain of smoke that covered his entire life, or was he trying to draw out a sword and save the lives of all under the heavens? Oh, trouble! It was painful! How should he choose?
Mathematical Reviews
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