These spikes are occuring continously. This is not just a powerup phenomenon.
The spikes are caused by the current flow through the inductance of the motor winding, being interrupted as the brushes switch the polarity of the drive to the windings.
I will be doing some testing of the current draw of the pump, and its behavior when undervolted later this evening.
There is a very clear pattern to the current draw of the pump, and if the nominal RPM of the pump were known, it should be possible to determine its RPM under different undervolted, and flow restricted conditions.
Do you know the nominal RPM Ben?
|