DC Drives and Motors

DC Drives/Control

"Generally, the rotational speed of a DC motor is proportional to the voltage applied to it, and the torque is proportional to the current. Speed control can be achieved by variable battery tappings, variable supply voltage, resistors or electronic controls. The direction of a wound field DC motor can be changed by reversing either the field or armature connections but not both. This is commonly done with a special set of contactors (direction contactors)." Click here to learn more.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia Article: "Electric Motor".

DC Motors

"The classic DC motor has a rotating armature in the form of an electromagnet. A rotary switch called a commutator reverses the direction of the electric current twice every cycle, to flow through the armature so that the poles of the electromagnet push and pull against the permanent magnets on the outside of the motor. As the poles of the armature electromagnet pass the poles of the permanent magnets, the commutator reverses the polarity of the armature electromagnet. During that instant of switching polarity, momentum keeps the classical motor going in the proper direction" Click here to learn more.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia Article: "Electric Motor".

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DRIVES | MOTORS