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Author Topic: DC Motor Controls - Suggestions? Matt Rockwell Film Handler Posts: 11 From: Madison, WI, USA Registered: Apr 2001 posted 11-01-2001 04:56 PM                     Hello all- Does anyone have any reccomendations for DC veriable speed motor controls that they find lend themselves well to use in the booth? I'm driving a 1/4hp. motor on simplex heads for our vaudville house. Analog/pot controllers are aplenty, but I'm intrested in either a preset or digital control for setting speed to adjust framerate. I just thought I'd put it out for suggestions. ------------------ Matt Rockwell xenon wrangler / carbon master IA #251  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 11-01-2001 05:39 PM                     I would tend to use a 3phase 3600 rpm sync motor with frequency drive controler Reliance Allen Bradley and Bodine all make very good programable ones  |  IP: Logged Greg Mueller Phenomenal Film Handler Posts: 1687 From: Port Gamble, WA Registered: Jun 99 posted 11-01-2001 06:44 PM                        What kind of budget do you have for the project? I've had pretty good luck so far using a 90vdc Leeson controller and a variety of 90vdc motors (1/2 horse) All the electronics are on a single 5x5 pc card with a heat sink. 110vac or 220vac in and will supply up to 10 amps out at 90v. Speed is controlled by a simple pot. If I remember correctly the card and heat sink were around $135 and I buy used motors off the net for $60-$100 ------------------ Greg Mueller Amateur Astronomer, Machinist, Filmnut http://www.muellersatomics.com/  |  IP: Logged Dennis Atkinson Expert Film Handler Posts: 129 From: Birch Run Michigan Registered: Feb 2000 posted 11-02-2001 07:33 PM                        I have done it both ways. 3 phase lets you use the controller as a FPS readout. With DC, a programable tach and tach pickup is needed for a FPS readout. Assuming you want to dial to a certain frame rate, go with 3 phase. Now what about the shutter? Flicker is bad at 18fps without a 3 blade shutter. There are other modifications that need to be done depending on the age of the Simplex. Dennis  |  IP: Logged

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