Fiber Optic Control Systems for an Electric Motor (1602) Members: - - PowerPoint PPT Presentation
Fiber Optic Control Systems for an Electric Motor (1602) Members: Alison Hosey, Michael Barbieri, and Edward Tash Sponsor: General Dynamics Electric Boat Advisor: Eric Donkor Date: November 30, 2015 Overview Introduction General
➢ Introduction ○ General Project Overview ■ Technology Description ■ Project Overview ■ Project Plan ■ Benefits of Implementing Technology ➢ Background ○ How fiber optics work ○ Benefits of fiber optics vs. their copper counterpart ➢ Optical Chopper ○ What it is ○ How does it relate to our project ➢ Basic Ideas ○ What we have done, are currently doing, and plan to do ➢ Important Items ➢ Timeline ➢ Conclusion
➢ Fiber optic cable construction - Figure 1 ➢ Modes of operation ○ Single mode fiber vs. multi mode fiber - Figure 2 ➢ Multiplexing ○ Wavelength division multiplexing - Figure 3 ➢ Power over Fiber (PoF) ○ Allows for power to be transmitted
➢ Media converter ○ Converts copper signals to light signals ○ Converts light signals to copper signals
Figure 1- Five components that make up a fiber optic cable. Figure 2- Light propagation paths within single mode fiber as well as multimode fiber. Figure 3- Signals of different wavelengths are multiplexed together over a single fiber optic cable and then demultiplexed and output accordingly.
Fiber Optics vs. Copper:
➢ Resistant to Electromagnetic Interference (EMI)
○ Fiber optic cables and components will not disrupt the operation of another electronic device in its vicinity as fiber does not give off any electromagnetic field.
➢ Data is transferred 10x faster
○ Fiber transfers data at approximately 10 Gigabits/sec where copper transfers data at approximately 1 Gigabit/sec.
➢ Does not give off heat/ is non-flammable
○ Fiber does not pass electricity.
➢ Security
○ Fiber is almost impossible to tap where copper is very susceptible to being tapped
➢ Size/ Weight
○ Fiber is approximately 0.9 micrometers in diameter and weighs approximately 0.0235 pounds/ft.
➢ System
○ Stanford Research Systems ○ SR540
➢ Purpose
○ Optical Experimentation ○ DC motor power ○ Chopping frequency control
➢ Capabilities
○ Adjustable frequency (from 4Hz to 3.7kHz) ○ Input control voltage
➢ Project Testbed
○ Analyze Non-Optical Circuitry ○ Change to Optic-Based System
■ Original power to PoF ■ Motor control circuit to fiber equivalent signals
○ Implement Cohesive Fiber System
➢ Open Source Design
○ Full Parts List ○ PCB layout ○ System Schematic
○ Temperature, Rotor Positioning, Measurements
○ 645 nm-660 nm red ○ three different having different wavelengths ○ issues with longer distances (chromatic Dispersion)
○ different wavelengths for different signals ○ easier to multiplex and and deMUX back to original signals ○ no issues over longer distances
○ need multiplex with power signal ○
○ possible media conversions required
❏ Investigate Fiber Optic Instrumentation ❏ Research Commercially Available PoF Equipment ❏ Design PoF system for DC motor ❏ Integrate Optical Instrumentation and PoF technology ❏ Test Motor + Optical Hardware Performance
(document results and recommendations)
10/16/15 11/20/15 12/11/15 2/15/16 4/1/16
➢ Benefits of Fiber Optics
○ Technical Capability (EMI, speed, heat) ○ Cost Saving ○ Scheduling Advantages
➢ Optical Chopper
○ Circuit Analysis ○ PoF + Optical Motor Control Testbed
➢ Single Fiber Link Design
○ Coupled Power and Control Signals ○ Commercially-available Hardware