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Arri 2 Blimp Motor Controller


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#1 Hal Smith

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Posted 04 October 2008 - 12:03 PM

I've been moving along slowly on the blimp motor project. I finally got a chance to hook up the ABB ACS50 single to three phase motor controller I bought off eBay to my blimp motor. It works like a charm, I can ramp speed anywhere from zero to fast enough to tear a non-high speed Arri 2 to bits.

Next up is building a photocell rig to use the ribs on the backside of the motor to interrupt an LED light beam to a photocell to get a tach signal for a phase lock loop circuit to crystal control the motor...the ABB controller has a zero to 10 volt DC analog input for speed control that's perfect for feedback from a PLL. The motor has 24 ribs on the rotor which would work out to 720 Hz running at design 1800 rpm which should work well for PLL control. I'll use a CD4046 CMOS PLL chip and I'm thinking of using my Tobin Milliframe controller for the reference frequency for the PLL circuit so I can have the best of both worlds; sound sync at 24fps, crystal sync for HMI speeds, video sync (23.976 reference), etc.

Note to Paul B: All my development for the Arri motor should transfer quite nicely to Mitchell three phase sync motors. You would need to create a tach signal for feedback to the PLL but the Mitchell's inching knob would be a good place to start.
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#2 Paul Bruening

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Posted 04 October 2008 - 10:03 PM

Any help is appreciated. You may be the champion of many of us, here.
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#3 Hal Smith

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Posted 04 October 2008 - 11:39 PM

Any help is appreciated. You may be the champion of many of us, here.

I rather like thinking of myself as the curator of the "Old School". ;)
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