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ALVINthe Albuquerque LabVIEW Interest Network
An Overview ofServo Motor System and
LabVIEW
Presented by Larry GogaFebruary 19th, 2009
The 3 rules for a good presentation!
Tell them what you’re going to tell them.
Tell them what you told them.
Tell them what you wantto tell them.
Presentation Overview
• My project• Servo Systems in
General• National Instruments
LabVIEW andNI Motion
• Yaskawa Electric
• Danaher Motion• QuickSilver Controls
Inc.• Summary & Review• Hardware and
Software Demo’s• Q&A
The PROJECT!
• Process Camera• Not a normal 35mm film
camera• Made by Photo-Sonics• Circa 1972, 37 years old• Used for special effects
photography• Used for color
separations• Used for animation• Had interchangeable
motors
Color Separations
• Convert color to B&W• Take 3 images of the same
frame• Synchronized with a color
wheel in the lamphouse• Black and white film doesn’t
fade• New and pristine color prints
or negatives can be made in the future by reversing the process
Specificationsfind a new motor and controller that would:
• Run continuously from 1 fps to 24 fps
• Speed operator selectable• Run in Stop Motion (1 frame)• Run in Sep. Mode (3 frames)• Run Forward & Reverse• Selectable STOP (Shutter
open or closed)• Work with various user inter-
faces (stand-alone, virtual or HMI)
• Generate output triggers
• Chase External Bi-Phase• Brushless Motor Design• Preferably American made• Reasonably priced• Work well in this application
• and ideally
• Be useable in other applications
• Most likely would be some sort of a Servo Motor and Controller System
What is a Servo System?
• A closed-loop motion system using a current amplifier, servo controller, servomotor and a position feedback device such as an encoder to precisely control speed and position of a load.
• The MOTOR can be electric, hydraulic, pneumatic or even internal combustion.
• The FEEDBACK sensor can be mechanical or electronic, analog or digital and it can be rotary or linear.
A Basic Servo System
• A servo controller with external input
• Motor connected to a feedback device
• Is a closed loop system
• How might this system work?
What do we have here?
The Feedback device canbe Relative or Absolute.
http://www.baldor.com/pdf/manuals/1205-394.pdf
The PID Controller• Proportional-
Integral-Derivative• Requires 3
adjustments - Kp, Ki and Kd
• Requires TUNING• Can be made to
learn how the system operates
Studying the PID controller can be a semester long course in Mechatronics.
http://www.ecircuitcenter.com/Circuits/pid1/pid1.htm
Selecting a Servo System
• Hundreds of vendors X Hundreds of choices = Thousands of Options
• Call your local NI Field Sales Engineer• Looked at Danaher Motion• Talked with Marc Christianson, NI Guru• Ruled out NI Motion• Suggested Yaskawa Electric
NI MOTION
• Hardware and Software• SoftMotion, Motion
Assistant, PID Toolkit• PCI and PXI Hardware• Servo and Stepper Motor
Controllers and Drives• Universal Motion Interfaces• Tutorials• Toolkits and Sample Code
for LabVIEW Applications
www.ni.com/motion
Yaskawa Review
• Pros• LabVIEW Interface• Good Software• Brushless DC Motor• Auto Tuning Feature• Mass Moment of
Inertia Calculation• Good Support
• Cons• Noisy• Moderately Expensive• Programmability• Universality• Support far away• Latency Issues
Back to the drawing board…Well, back to Danaher Motion anyway!
Found ABQ representationin TMMI - Technical Marketingand Manufacturing Inc.http://www.tmmi.com/Local Contact: Ernie Aragon
Danaher is a Partnerwith
National Instrumentswww.danahermotion.com
• Added an encoder to a Stepper Motor
• Free design software
• LabVIEW Interface
• Example Programs
• Broad line of motors and controllers
• Local support
http://www.quicksilvercontrols.com/
Recommended