Don't you need 4 quadrant switching to do true
regen back to the battery. I think someone in the group installed a 4q
unit that does this.
radsett aeolusdevelopment com wrote:
Quoting
Ralph & Elaine Vogan :
>> I may be wrong, but my understanding of plug braking is that
it does
>> not actually apply reverse current. Rather it maintains the
field
>> current while short-circuiting (or nearly so) the armature.
This
>> stops the motor very quickly. If I'm wrong about that, I
certainly
>> welcome correction of my misapprehension from the designers of
the
>> Alltrax, the designers of any other plug-braking controller
such as
>> a Curtis, or those who have studied plug-
>> braking controller design.
>>
>> I agree, but plugging means to turn yhe field on & off to
control
>> the rate of braking. To bad our Alltrax doesn't work that way.
>> Ralph
OK, now that's a definition I could accept (field control with armature
shorted). It fits with the usage I've seen and covers the reversal in
used in
series wound motors (during which they do essentially control the
field). I'm
not sure you could modulate the field fast enough in a shunt wound
motor to
maintain control which may be why Alltrax doesn't try.
I don't understand why they avoid regen though, but that's their
decision.
Robert
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