Jump to content


Photo

Arri 2 Blimp Motor Controller


  • Please log in to reply
2 replies to this topic

#1 Hal Smith

Hal Smith
  • Sustaining Members
  • 2280 posts
  • Cinematographer
  • OKC area

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.
  • 0

#2 Paul Bruening

Paul Bruening

    (deceased)

  • Sustaining Members
  • 2858 posts
  • Producer
  • Oxford, Mississippi

Posted 04 October 2008 - 10:03 PM

Any help is appreciated. You may be the champion of many of us, here.
  • 0

#3 Hal Smith

Hal Smith
  • Sustaining Members
  • 2280 posts
  • Cinematographer
  • OKC area

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". ;)
  • 0


Visual Products

Rig Wheels Passport

Willys Widgets

rebotnix Technologies

Ritter Battery

Broadcast Solutions Inc

Abel Cine

Glidecam

Wooden Camera

Gamma Ray Digital Inc

FJS International, LLC

Technodolly

Tai Audio

Aerial Filmworks

Paralinx LLC

CineTape

The Slider

Opal

Metropolis Post

Media Blackout - Custom Cables and AKS

CineLab

Visual Products

Paralinx LLC

FJS International, LLC

Aerial Filmworks

rebotnix Technologies

Tai Audio

Willys Widgets

Technodolly

The Slider

Abel Cine

Ritter Battery

Wooden Camera

Opal

CineLab

Metropolis Post

Rig Wheels Passport

Media Blackout - Custom Cables and AKS

Broadcast Solutions Inc

Glidecam

CineTape

Gamma Ray Digital Inc