I have a pump project that I am returning to, and after my PWM grinder project, I discovered
freewheel diodes and their importance. I killed a few of my controllers in past iterations, maybe
I can avoid that.
1) How do I select the voltage rating of the diode? Do the voltage spikes occur when
the motor is running? Are the spikes more than the psu voltage?
2) Amp rating?
3) Shall the freewheel diode be an ordinary diode, or a fast one? Is soft recovery worthwhile?
4) In a shunt motor, (the kind with rotor and field connected in parallel, not the universal type)
is there any special considerations for the freewheel diode?
The two motors I have been working with are 90v pm 1/4HP 2.5A,
and a 110v 1/3HP @ 3A shunt-wound, both 56c frame.
This is for a homestead, moving water to storage. I use a filter, but when it gets dirty,
the Amp draw goes high, so I intend to create some kind of feedback to slow the delivery
until the filter can be replaced. Anyway, the freewheel diodes are my starting point on this
project.
freewheel diodes and their importance. I killed a few of my controllers in past iterations, maybe
I can avoid that.
1) How do I select the voltage rating of the diode? Do the voltage spikes occur when
the motor is running? Are the spikes more than the psu voltage?
2) Amp rating?
3) Shall the freewheel diode be an ordinary diode, or a fast one? Is soft recovery worthwhile?
4) In a shunt motor, (the kind with rotor and field connected in parallel, not the universal type)
is there any special considerations for the freewheel diode?
The two motors I have been working with are 90v pm 1/4HP 2.5A,
and a 110v 1/3HP @ 3A shunt-wound, both 56c frame.
This is for a homestead, moving water to storage. I use a filter, but when it gets dirty,
the Amp draw goes high, so I intend to create some kind of feedback to slow the delivery
until the filter can be replaced. Anyway, the freewheel diodes are my starting point on this
project.