What about a simple motor controller with overload protection (aka a heater)?
On Dec 30, 2019 02:42, Jerry Durand <jdurand@...> wrote:
I figure the standard green button to start, red to stop.? Green closes the relay and starts a ramp-up timeout.? After that each spoke passing is timed.? Too long, kill power.
And, of course a switch to detect the cut is done.? That kills power immidiately.
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Jerry Durand
Durand Interstellar, Inc.
On Dec 29, 2019, at 23:38, "Robert Downs via Groups.Io" <
cs.com@groups.io target=_blank>
[email protected]> wrote:
It will have to have a manual override switch to start it.
?
?
?
I was figuring an inductive sensor reading the wheel spokes.? Simple, doesn't care about dirt/damp.
Something like one of these:
I once replaced all the optical sensors on a production line with inductive ones.? Suddenly we stopped getting service calls all the time.? When I gutted the motor controller box and reduced it to about 4 parts that solved most of the rest of the calls.
The engineer who designed the system was pissed when he saw what I did.
The production manager, however, was delighted.
Durand Interstellar, Inc.
On Dec 29, 2019, at 23:02, John Vreede <vreededesign@gmailcom> wrote:
Yeah I've thought about that too Jerry.
Do you have any particular sensor in mind?
I wonder if a sensor on the motor might be better, as its the motor you're trying to protect.
If it loads up so the motor rpm drops to 1250rpm, it will stall almost immediately it drops any lower, so a sensor that cuts the power between 1300 and 1250 rpm would be ideal.? There must be an electric/electronic solution.? Anyone out there who can comment? - jv??
