| 11. | Electric motors, field coils, transformers and capacitors may also be assembled with ultrasonic welding.
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| 12. | Some older or simpler arrangements use a single field coil with a pole at each end.
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| 13. | Field coils were once widely used in loudspeakers before the general availability of lightweight permanent magnets.
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| 14. | Unusually, both the field coils and the armature winding are carried on the fixed stator.
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| 15. | Design challenges include the toroidal and poloidal field coils, vacuum vessels and plasma-facing components.
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| 16. | Two antennae and two field coils are used, both arranged at right angles to each other.
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| 17. | In this instrument a stationary field coil produces a rotating magnetic field, just like a polyphase motor.
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| 18. | This flows through the field coils, creating a larger magnetic field which generates a larger armature current.
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| 19. | This increases the magnetic field around the field coils which induces a greater voltage in the armature coils.
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| 20. | Very large power station generators often utilize a separate smaller generator to excite the field coils of the larger.
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