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Unread 09-02-2010, 22:26
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Mike Betts Mike Betts is offline
Electrical Engineer
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Team Role: Engineer
 
Join Date: Dec 2001
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Re: Electromagnetic gate latch?

Quote:
Originally Posted by Al Skierkiewicz View Post
Dick,
I have waited to see what some teams have decided to use before I weigh in on the speed controller issue. Certainly with any current that exceeds the abilities of the Spike, you would have no choice. On your coil though, the Spike would not have a problem. The PWM nature of the Jaguar output might cause some issues with the inductance of the coil. It is possible that this interaction could produce voltage peaks in excess of the breakdown of the Power FETs in the Jaguar. did you possibly address this question with Luminary? Most designs using a coil in a DC circuit would contain a diode snubber across the coil to prevent the inductive "kick" from damaging the drive components and producing significant RF interference.
Al, Dick, et al,

The GDC appears to consider an EM as a custom circuit (here) and as such, it must be protected by a 20A circuit breaker (<R46> part F).

There is no scenario I can see where a Spike should not be an adequate and, in my opinion, the preferred method of controlling an EM.

Regards,

Mike
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Mike Betts

Alumnus, Team 3518, Panthrobots, 2011
Alumnus, Team 177, Bobcat Robotics, 1995 - 2010
LRI, Connecticut Regional, 2007-2010
LRI, WPI Regional, 2009 - 2010
RI, South Florida Regional, 2012 - 2013

As easy as 355/113...