Can a DC Motor Generate Electricity?
Rotating a suitable DC motor can produce electrical voltage. Useful output depends on speed, motor construction, load and conversion losses.
Many motors are reversible energy converters
The motor does not become an energy source; mechanical work supplied to the shaft is the input.
What to ask next
What is the claimed energy source? Where is the system boundary? What has actually been measured? Can an independent investigator reproduce the result? Those questions prevent terminology from substituting for evidence.
For the product-specific application of these ideas, see our Moray Generator review.
This publication explains concepts; it is not a substitute for qualified electrical advice. Do not connect experimental equipment to household mains wiring or utility systems without appropriate professional expertise and approvals.