The biggest weakness of DC motor speed regulators is the current commutation problem, which consumes a lot of non-ferrous metals, is costly, and is troublesome to maintain during operation. Therefore, the motor manufacturing industry is working hard to improve the speed regulation performance of AC motors and replace DC motors in large quantities.
However, in recent years, great progress has been made in using thyristor rectifiers to replace DC generators. All rotating electrical machines, including DC motor speed regulators, are actually manufactured based on two basic principles we know. One is that the wire cuts the magnetic flux to generate an induced electromotive force; the other is that the current-carrying conductor is affected by the electromagnetic force in the magnetic field.
Therefore, from a structural point of view, any motor includes a magnetic field part and a circuit part. From the above principle, it can be seen that any motor reflects the interaction between electricity and magnetism, and is the unity of the two contradictory opposites of electricity and magnetism. The discussion of the structure and working principle of the DC motor speed regulator here is to discuss how the "magnetism" and "electricity" in the DC motor speed regulator interact and restrict each other, as well as the physical quantities and phenomena that reflect the relationship between the two (armature electromotive force, electromagnetic torque, electromagnetic power, armature reaction, etc.).
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