so..... the sevcon controller is programmed to deliver a maximum number of amps and then "pulse width modulates) so as to deliver somewhere between zero and that programmatically set upper limit?
From: Andrew Gilchrist <andrew@fastelectrics.com>
To: electricboats@yahoogroups.com
Sent: Thursday, November 1, 2012 8:27 PM
Subject: RE: [Electric Boats] the device name???..
Pulse width modulation speed control
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of Michael Mccomb
Sent: Friday, 2 November 2012 11:41 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] the device name???..
Sent: Friday, 2 November 2012 11:41 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] the device name???..
I'd like to be able to control a PMAC motor by amperage rather than voltage. Surely there is a device that does this function but I do not know what it would be called.
As one would move the controller/actuator one would be increasing the number of amps that would be supplied to the motor. The "controller" would feed a voltage to the motor, detect the amperage being consumed and then adjust the voltage continuously until the called for amperage was attained.
So let's say that one moves the controller of such a device up from zero amps and so as to be set for 20 amps. The device would detect that setting raise the voltage supplied to the motor as it monitored the amperage being drawn. Of course the amperage would go way up when the voltage was first applied but then quickly come back down to below the selected 20 amps that was called for and therefore the voltage would increase some more with the same resulting cycling reoccurring until a steady state of some unknown voltage BUT 20 smps was attained.
I know that I could build the thing but surely it already exists. Can someone tell me the name of such a device?
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