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Understanding Torque and Electromagnetism in Electric Motors

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derora
9 diapositives · 259 Views · Oct 12, 2014

This article explores the principles of torque and electromagnetism, demonstrating how a magnetic field can generate a force on a current-carrying wire. When this wire is positioned perpendicularly to a magnetic field, it experiences torque, allowing it to rotate. This concept underpins various devices, including electric meters like galvanometers and ammeters, which measure electric current and potential difference. We also discuss the application of these principles in electric motors, emphasizing their practicality and usefulness in technology.

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  1. Torque and Electromagnetism

  2. It’s possible to use a magnetic field to create a force on a length of wire. If we place a current carrying wire perpendicular to the magnetic field, the wire will feel a force perpendicular to both. x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x e -

  3. This would be much more useful and practical if we could create a spinning motion. We could apply this spinning motion to wheels or motors; very useful devices! Is there a way to create this spinning motion with magnetic fields? Yes! It requires a coil of wire.

  4. Torque If a wire loop is placed in a uniform magnetic field, F N S F e - the loop experiences a torque (turning force), which causes the loop to rotate.

  5. F N S F e - The loop will only rotate 90°, then stop. This is the basis for electric meters and motors.

  6. Electric Meters Galvanometers: Measure weak electric currents, and thus measure magnetic fields. A galvanometer is made by placing a coil of wire in a magnetic field. The coil is attached to a spring. The more current that flows through the coil, the more the needle moves.

  7. Ammeters: A modified galvanometer that measures larger currents. A low resistance shunt is put in parallel with the galvanometer so that most of the current flows through the shut. The needle moves less since less current is flowing through the galvanometer, to ensure bigger currents. The lower the shunt’s resistance, the bigger a current it can measure. G

  8. Voltmeter: A galvanometer modified to measure potential difference. To do this, a high resistance is linked to the galvanometer in series.

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