Variable speed control
DC machines - Constitution and operation

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D3555 V1 Article

Variable speed control


DC machines - Constitution and operation

Author : François BERNOT

Publication date: May 10, 1999, Review date: July 9, 2020 | Lire en français

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4. Variable speed control

We have examined the fixed-supply behavior of motors with different inductor couplings. For a long time, DC motors were the only motors suitable for variable speeds. Numerous solutions were devised, from resistors to modern electronic drives. We'll take a brief look at the conditions under which DC motors can be used for variable speed control.

4.1 Separately excited motor

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4.1.1 Control principle

We have seen that the torque characteristic in figure

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