Permanent magnet can degenerate by many ways. But it really needed in compact generator to convert mechanical force into electric But are there any other way to generate electric from mechanical force without magnet? I want to design self exited magnet for dynamo. It need tobe an effect that could generate electricity from spinning something and feed electric to excite the electromagnet as a starter, when electromagnet become magnetized it would then feed itself after that Are there any effect like I talk about? Piezoelectric cannot be used. It's short spark electric so it need to have inconvenient circuit I have heard that there are such a way like spinning the conductor (copper/silver) and it would generate electric directly from centrifugal force pushing electron. But I'm not sure it's true and really useable in this case or not. Or there are any other effect I could use? Thank you P.S Another question What happen when we weave the coil around permanent magnet, using permanent magnet like it is electromagnet, and feed electric into it. Would it stronger? Would it regenerate magnetic force? Or would it make that magnet degenerate faster?