This is out of my balliwick, but in my pursuit of understanding motors and perhaps building a new higher efficient one, I have been fighting with this undesirable occurrence.
If I understand how this flyback/ringing action effects DC motor operations, after the commutator connections are opened (due to the spinning action) the coils need to collapse the magnetic field. As this occurs there is a negative reaction to the spinning motor causing inefficiencies in the design. My premise is to set up another set of brushes to the commutator (connected to nearly all the coils not being electrically driven) to wire in a snubber circuit (probably not a diode, a short circuit seems quicker). I see the arcing to be a big problem unless it is damped somehow.
Does anyone know if this has been tried, or if anyone has designed something electrically to help with this solution, or has it all been done mechanically with metal changes to minimize the eddy currents etc.?
If I understand how this flyback/ringing action effects DC motor operations, after the commutator connections are opened (due to the spinning action) the coils need to collapse the magnetic field. As this occurs there is a negative reaction to the spinning motor causing inefficiencies in the design. My premise is to set up another set of brushes to the commutator (connected to nearly all the coils not being electrically driven) to wire in a snubber circuit (probably not a diode, a short circuit seems quicker). I see the arcing to be a big problem unless it is damped somehow.
Does anyone know if this has been tried, or if anyone has designed something electrically to help with this solution, or has it all been done mechanically with metal changes to minimize the eddy currents etc.?
