What is a homopolar generator and how does it work?

A homopolar generator is a direct current electrical generator featuring an electrically conductive disc or cylinder that rotates within a uniform static magnetic field. It creates a potential difference between the center and the rim of the conductor without requiring rectifiers or commutators. Because of its very low internal resistance, it is capable of producing massive electric currents exceeding a million amperes.

What we know

• A homopolar generator comprises an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field. [2]
• The device generates a potential difference between the center of the disc and the rim with a polarity dependent on the direction of rotation and field orientation. [2]
• Homopolar generators are unique because no other rotary electric machine can produce direct current without using rectifiers or commutators. [2]
• Some homopolar generators can source tremendous electric currents exceeding a million amperes due to very low internal resistance. [2]
• A pure homopolar generator is an electric generator not requiring brushes or electronics or semiconductor parts to convert torque into direct current. [5]

Where to go next

• compared withHow does a homopolar motor operate?
• a case in pointWhat is the Faraday disk?
• the bigger pictureHow do standard electric generators work?
• how it workedWhat defines a pure homopolar generator?
• whoWho invented the first electromagnetic generator?
• an unexpected connectionHow does running a homopolar motor in reverse generate electricity?A homopolar motor can function directly as a homopolar generator when its device shaft is driven in reverse by rotary motion.

Sources

• [1]homopolar generator (Wikidata Q1761040) · CC0 1.0
• [2]Homopolar generator · CC BY-SA 4.0
• [3]Homopolar motor · CC BY-SA 4.0
• [4]Electric generator · CC BY-SA 4.0
• [5]Pure homopolar generator · CC BY-SA 4.0

Your path

1. What is the Naccache-Stern cryptosystem?
2. /What is a homopolar generator and how does it work?