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Any motor will slow down after you remove power, all motors have some friction and resistence in them. To completly remove that influence, you'd need to some how use a clutch to disconnect the motor from the gearing. Or, even better, the flywheel from the gearing.
As for a generator... Why not just a D.C. motor? Put some resistors across the leads to simulate load. D.C. motors function just like generators in this way. This is probably cheaper then a generator.
One note, you should probably use a fuse or breaker in the resitor block... Other wise you might melt down some resistors and/or start a little fire.
-Andy A.
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