Motor Effect

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6 Terms

1
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What is the motor effect?

The motor effect is when a current-carrying wire experiences a force when placed in a magnetic field.

2
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What three factors determine the magnitude of magnetic force?

1. Magnetic flux density of the field.

2. Current in the wire.

3. Length of the wire.

3
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State the equation used to calculate the force when a current carrying wire is placed in a magnetic field.

Force = Magnetic Flux Density x Current x Length of Wire

F = BIL

4
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Describe the required orientation of the wire and field for the equation of force to hold true.

The field and current flow must be perpendicular to each other

5
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Explain the basic operation of a motor

  • A motor consists of a rectangular coil formed of a current-carrying wire on a pivot.

  • The coil is placed in a uniform magnetic field and a force is experienced on the two sides perpendicular to the field.

  • The current flow is in opposite directions on these sides causing the forces produced to be in opposite directions, causing rotation.

6
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What is produced when a motor rotates?

A back emf that provides resistance to the motor’s rotation and limits its speed of rotation.