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Explanation of the Electric Motor Demonstrated in Class

Explanation of the Electric Motor Demonstrated in Class. I. I. Explanation of the Electric Motor Demonstrated in Class. Rotor or armature (the rotating piece of the motor ). I. I. Explanation of the Electric Motor Demonstrated in Class. B coil. Which induces this B-field.

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Explanation of the Electric Motor Demonstrated in Class

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  1. Explanation of the Electric Motor Demonstrated in Class I I

  2. Explanation of the Electric Motor Demonstrated in Class Rotor or armature (the rotating piece of the motor) I I

  3. Explanation of the Electric Motor Demonstrated in Class Bcoil Which induces this B-field Follow the wires and find this direction of current at this instant To align the B-fields, a CW torque is created. In this position, the torque is maximum Rotor or armature (the rotating piece of the motor) I I I Bext Bext τ I Coils (or bar magnets) are used to create the external magnetic field

  4. Explanation of the Electric Motor Demonstrated in Class Bcoil In this position, the angle between Bcoil and Bext has decreased, so the torque has decreased The rotor rotates I I I Bext Bext τ I

  5. Explanation of the Electric Motor Demonstrated in Class The rotor continues to rotate I I Bext Bcoil Bext Bcoil τ=0 In this position, the B-fields are aligned and the torque is zero

  6. Explanation of the Electric Motor Demonstrated in Class Bcoil Momentum carries the rotor further around Follow the wires in this position and find that the current in the coils has changed direction Inducing a B-field in this direction I I Bext Bext I τ I And so the torque continues to be clockwise.

  7. Explanation of the Electric Motor Demonstrated in Class The rotor rotates to this position, which is 180º from where it started. Since the current and Bcoil have switched directions, it is essentially the same configuration as it was at the start. Bcoil And so, the process repeats… I I I Bext Bext τ I

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