A dc motor is one of the most common motors in modern industry, widely used in various fields, owing to its good control characteristic. Despite The ac motor is better than dc motors in aspects of the structure, price, and maintenance, for the ac motor speed control problem has no very good solving solution, at present , the dc motor is still widely used on account of its advantages, such as: good speed control performance, easy starting, load starting , etc.
The development history of dc motors forms the early motor phylogeny. In 1821, Faraday discovered the force of the phenomenon of current-carrying conductor in magneti
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