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Old 09-28-2016, 11:08 AM   #2 (permalink)
Grant-53
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If we are talking about a generator system then minimum drag is when there is no current in the field windings or the armature is not moving. The core of the field coils will have some residual magnetism so there will be some slight output with the armature moving. A clutch on the armature shaft could control it such as used on an AC compressor though there would need to be enough current from a battery to engage it.
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