How DC Electric Motor Works
28 August 2009 | Green Technology | 3 Comments
When a current flows through a rotor, is generated a magnetic field, generating an electromagnetic force, and as a result the rotor rotates. The rotation of the rotor induces a voltage in the rotor windings. This induced voltage is opposite to the external voltage applied to the rotor. While the rotor rotates faster, resulted voltage is almost equal to induced voltage. Current is small, and the motor speed remains constant as long as this motor does not perform other mechanical work than spinning rotor.
When the rotor is used for another supplementary mechanical work, voltage will be reduced and a higher current can pass through the rotor. In this way the engine will be able to receive more power from the source and will perform more mechanical work. Since the rotation speed control current passing through the rotor, to start DC motors, we need some special mechanisms. When the rotor does not spin, it actually has no resistance, and if the normal voltage is applied, will pass a large current, that could damage the motor brushes or collectors.
To avoid this type of accidents are used resistors connected in series, and also connected with the rotor, to limit the current until the motor begins to develop a sufficient current. When the rotor begins to spin faster, resistors must be gradually reduced, manually or automatically. The speed with a DC motor works, depends on the magnetic field applied to the rotor, and the rotor current. The more powerful magnetic field is, rotation rate is reduced. For this reason DC motor speed can be controlled by changes in current field.
Tags: collectors, Current, current flows, DC motor brushes, DC motor speed, DC motors, electromagnetic force, external voltage, higher current, induced voltage, limit the current, magnetic field, mechanical work, motor speed, resistors connected in series, rotation speed, rotor, rotor current, rotor rotates, rotor rotates faster, spinning rotor, voltage in the rotor windings
Okay..! Thanks fro explaining the working of the Electric motor. But.. What are the pros and cons involved in this?
Angeline @ marcus evans scam
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Quite inspiring post, Thank you !!…
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Very cool! I assistance your view!…