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Is it dangerous to run a permanent magnet alternator open-circuited? No current can flow so is all the power dissipated as heat? Is there even power generated in the inductive coils?

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Since power is current multiplied by voltage, and no current is flowing, it is not power dissipation you need to worry about.

Voltage will be generated, but it shouldn't cause a problem.

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  • \$\begingroup\$ Hi @evildemonic, thanks for responding. What is your source for this? Did you read it in a textbook or experience it from working with PM alternators, or are you just referencing basic circuits theory? \$\endgroup\$ – user211492 May 1 at 18:02
  • \$\begingroup\$ This is from basic electronics theory and general experience with motors and alternators of all types. A voltage will be produced, but actual power will not be generated. \$\endgroup\$ – evildemonic May 1 at 18:10
  • \$\begingroup\$ I heard from someone else, who also has some experience with motors and alternators, that after enough time running open-circuit it will overheat. So I don't think I can come to a conclusion one way or another before testing it myself. \$\endgroup\$ – user211492 May 2 at 16:48

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