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Introduction to DC Machines

Introduction to DC Machines. Advantages Adjustable speed Develop rated torque at all speeds Higher torque than an equivalent AC machine Uses Robots Automotive Railroads. Elementary 2-pole DC motor. Poles created by DC current in the field winding or by a permanent magnet.

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Introduction to DC Machines

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  1. Introduction to DC Machines • Advantages • Adjustable speed • Develop rated torque at all speeds • Higher torque than an equivalent AC machine • Uses • Robots • Automotive • Railroads

  2. Elementary 2-pole DC motor Poles created by DC current in the field winding or by a permanent magnet

  3. Flux through the “window” of a 1-turn armature coil as a function of position

  4. Voltage induced in the armature coil

  5. Flux Distribution and Induced Voltage The induced voltage is AC

  6. Average Value of one-half cycle

  7. Rectify the other half-cycle Ea

  8. Express in r/min

  9. Commutation / Mechanical Rectification • “Neutral” position • Coil shorted by the brushes • No armature voltage generated – coil sides not cutting any flux • No current

  10. Commutation (continued) • Brushes contact the armature conductor • CCW rotation • Coils sides cut flux • Current in A as shown • Current in B as shown

  11. Commutation (continued) • “Neutral” position • As before, coil shorted by the brushes • No armature voltage generated – coil sides not cutting any flux • No current

  12. Commutation (continued) • Brushes contact the armature conductor • CCW rotation • Coils sides cut flux • Current in B as shown • Current in A as shown • Currents are in the same direction as before!

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