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In a basic rotating electromagnetic machine, how does motor construction differ from generator construction?

It can use the same basic construction; energy flow determines the role.

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  1. A generator needs permanent magnets, a motor does not
  2. A motor has no coils
  3. They have the same basic construction ✔

Why: Both can use rotating coils and magnetic fields. Feed in electrical energy and it turns as a motor; apply external torque and it can generate electricity.

Huh, didn't know that: A motor acts as a generator when external torque turns its shaft.

The dad joke
A motor and a generator walk into a bar. The bartender says, you two look like you were made for each other.
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References

Answer: They have the same basic construction. Both can use rotating coils and magnetic fields. Feed in electrical energy and it turns as a motor; apply external torque and it can generate electricity.

  1. OpenStax College Physics 2e, 23.6 Back Emf openstax.org/books/college-physics-2e/pages/23-6-back-emf
    Furthermore, motors and generators have the same construction.
    Checked 2026-10-10.

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