Linear Induction Motor
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1 Linear Induction Motor Electrical and Computer Engineering Tyler Berchtold, Mason Biernat and Tim Zastawny Project Advisor: Professor Steven Gutschlag 4/21/2016
2 Outline of Presentation 2 Background and Project Overview Microcontroller System Final Design Economic Analysis Hardware State of Work Completed Conclusion
3 Outline of Presentation 3 Background and Project Overview Microcontroller System Final Design Economic Analysis Hardware State of Work Completed Conclusion
4 Alternating Current Induction Machines 4 Most common AC machine in industry Produces magnetic fields in an infinite loop of rotary motion Current-carrying coils create a rotating magnetic field Stator wrapped around rotor [1] [2]
5 Rotary To Linear 5 [3]
6 Linear Induction Motor Background 6 Alternating Current (AC) electric motor Powered by a three phase voltage scheme Force and motion are produced by a linearly moving magnetic field Used in industry for linear motion and to turn large diameter wheels [4]
7 Project Overview 7 Design, construct, and test a linear induction motor (LIM) Powered by a three-phase voltage input Rotate a simulated linear track and cannot exceed 1,200 RPM Monitor speed, output power, and input frequency Controllable output speed [5]
8 Initial Design Process 8 Linear to Rotary Model [m] diameter [m] arbitrary stator length Stator contour designed for a small air gap Arc length determined from stator length and diameter Converted arc length from a linear motor to the circumference of a rotary motor Used rotary equations to determine required frequency and verify number of poles [6] L = Θr (1.1)
9 Rotational to Linear Speed 9 (1.2) (1.3)
10 Pole Pitch and Speed 10 (1.4) For fixed length stator τ= L/p L = Arc Length τ A B C A B C [7]
11 Output Synchronous Speed [m/s] Linear Synchronous Speed Ideal Linear Synchronous Speed vs. Frequency 2-Pole Machine (stator length m) 4-Pole Machine (stator length m) [8] Frequency [Hz]
12 Outline of Presentation 12 Background and Project Overview Microcontroller System Final Design Economic Analysis Hardware State of Work Completed Conclusion
13 Variable Frequency Drive 13 VFD 0-10V signal correlates to Hz A/D Converter Onboard the ATmega ms interrupt service routine Resolution is 0-5V D/A Converter External chip Provides 0-10V reference signal to VFD to control output frequency [9]
14 Variable Freqeuncy Drive System Block Diagram 14 D/A Analog 0-10V Atmega 128 Microctonroller Start/ Stop 0-10V Signal A/D Analog 0-10V [10]
15 Tachometer Subsystem 15 Main Components Photo-interruptor Transparent Disk with Notches External Interrupt Counts pulses 4 pulses per rotation 250 ms interrupt service routine [11]
16 LCD Subsystem 16 LCD Displayed Values RPM Calculation to obtain RPM Convert to string Input string to LCD Output frequency Calculation to obtain VFD output frequency Convert to string Input string to LCD
17 Outline of Presentation 17 Background and Project Overview Microcontroller System Final Design Economic Analysis Hardware State of Work Completed Conclusion
18 Initial Design 18 3-phase, 2-Pole machine Salient pole arrangement Operating at a max frequency of 120 [Hz] 18 ( [m]) diameter track Desired 12 ( [m]) length for the stator Max rotational speed of 1200 [RPM] corresponding to a max linear speed of [m/s] A B C A B C [12]
19 Output Synchronous Speed [m/s] Rotational to Linear Speed Ideal Linear Synchronous Speed vs. Frequency 2-Pole Machine (stator length m) 4-Pole Machine (stator length m) [13] Frequency [Hz]
20 Output Synchronous Speed [m/s] Rotational to Linear Speed Ideal Linear Synchronous Speed vs. Frequency 2-Pole Machine (stator length m) 4-Pole Machine (stator length m) [14] Frequency [Hz]
21 Turns Per Phase 21 T ph = P out 6. 66{pn ms B ag A p k w I ph η PF (1.5)
22 Previous Data 22 TABLE I: PREVIOUS DATA FROM MAGNETIC LEVITATION SENIOR PROJECT Rotational Speed (RPM) Output Power [W] [15] [16]
23 Final Design 23 4-Pole machine Salient pole arrangement Laminated stator segments Operating at a max frequency of 120 [Hz] 16 AWG with current rating of 3.7 [A] Stator Tooth Length of 3.5 ( [m]) Mounting holes on stator Theoretical 213 turns per stator tooth Achieved 235 turns per tooth
24 Wiring Diagram 24 N S N N S S S N N N S S [17]
25 Insulated Bobbins 25 Glass cloth tape used between the stator teeth and coils Electrical tape used at ends to secure glass cloth tape Necessary to prevent shorting between copper coils and the stator core Plastic pieces in stator slots to further prevent shorting [18]
26 Outline of Presentation 26 Background and Project Overview Microcontroller System Final Design Economic Analysis Hardware State of Work Completed Conclusion
27 Bill of Material 27 TABLE II: BILL OF MATERIAL Component Supplier Price Quantity Total Price Laminated Stator Core Laser Laminations $375 1 $375 2,000 ft. Dipped Copper Wire Illinois Switchboard $176 1 $176 Scotch Glass Cloth Tape Grainger $ $57.75 Scotch Vinyl Electrical Tape Grainger $ $26.85 Power First Cable Tie Bag (100) Grainger $ $ /8" 6" Steel Bolts Ace Hardware $ $ /8" 6" Steel Bolts Ace Hardware $ $2.98 3/8" Nuts Ace Hardware $ $7.20 Angle Irons Ace Hardware $ $13.99 $706.87
28 Outline of Presentation 28 Background and Project Overview Microcontroller System Final Design Economic Analysis Hardware State of Work Completed Conclusion
29 Completed Stator 29 Manufactured by Laser Laminations [19]
30 Simulated Linear Track Mounting Solution 30 Using previous mounting hardware used with new base mounting Smaller air-gap then anticipated was achieved Under 1/8 air-gap [20]
31 Simulated Linear Track Mounting Solution Con t 31 6 Inch fully threaded steel hex bolts Allow for fine adjustment of wheel height Wheel mounting was raised 1-9/16 Put bolts through all linear track mounting parts to prevent bending of bolts on angled components [21]
32 Stator Mounting Solution 32 Angle irons used to hold bottom mounting holes of stator to base 11/32 bolts used in both base and stator mounting [22]
33 General Mounting 33 All parts sand blasted to remove rust and previous paints Spray painted grey for uniform color and rust prevention Washers used with mounting hardware [23]
34 Issues with Mounting 34 Initial stator mounting holes from stator to base were off Required re-drilling of mounting holes Simulated linear track is not perfectly balanced Changed the screws holding the copper on simulated linear track to prevent coil interference [24]
35 Linear Track Run-off 35 TABLE III: Total Run-off of Simulated Linear Track Side (+) Run-off (-) Run-off Total Run-off Right Middle Left [25]
36 Coil Materials Used AWG Wire GP/MR-200 Magnet Wire/ Winding Wire Heat is rated at 210C by wire Wire diameter calculated when determining turns per phase and stator tooth width of gap between adjacent coils [26]
37 Mock Stator Tooth 37 Created a mock wood stator tooth Grooves in base to hold zip-ties Wrapped brass around tooth Increase size Allows for coil to be moved on stator easier [27]
38 Winding Coils 38 Created a replica stator tooth for winding coil on Initially used a slow lathe for windings coils Approximately 2 hours to create one coil Issues with layer quality [28]
39 Winding Coils 39 Changed to a different lathe Benefits included higher quality wraps Increase in speed Only 30 Minutes to complete a coil [29]
40 Winding Methods and Changes 40 Drilled a hole into base of wooden tooth for more secure winding start Added a layer of Teflon on each coil layer Wrapped outsides of coils with glass cloth tape for protection and extra support [30] [31]
41 Issues with Winding and Coils 41 Wires crossing back accidently in layers Losing tension in wrapping Results in slinky effect Coils when tightened down collapse [32] [33]
42 Mounting Coils 42 Wire ends were sanded down to remove the varnish insulation Wires are labeled with inner and outer wire for connecting coils together Zip-ties are used on each side of the coil to secure the wires together to prevent Additional zip-ties were used to secure the coils to the stator to prevent movement when the wheel is in motion
43 Outline of Presentation 43 Background and Project Overview Microcontroller System Final Design Economic Analysis Hardware State of Work Completed Conclusion
44 Completed Work 44 Stator Built and Designed Frequency vs. Speed simulation Coils designed and created Mounting solution built for simulated linear track and stator A/D convertor Tachometer and LCD interfacing
45 Outline of Presentation 45 Background and Project Overview Microcontroller System Final Design Economic Analysis Hardware State of Work Completed Conclusion
46 Conclusion 46 Future Work Update wheel for an improved simulated linear track Update mounting solution for a more balanced wheel and smaller air-gap Test thoroughly and generate model for simulations Implement more advanced control scheme Reinstall magnetic levitation system
47 Questions? 47
48 Derivation of Eq. (1.5) 48 WHERE:
49 Salient and Non-Salient 49 A B C A B C [34] Salient Pole Arrangement A B C A B C [35] Non-Salient Pole Arrangement
50 50 Final Stator Design [36]
51 Gantt Chart 51 [37]
52 Coil Inductance 52 (1.6) 2-Pole: L = 2.55 [µh] 4-Pole: L = 0.30 [µh]
53 Star Connection 53 [38]
54 Overall System Block Diagram 54 [39]
55 [40] 4-Pole Machine Wiring Diagram 55
56 References # [1] Linear Induction Motor. [Photograph]. Retrieved from [2] Motor Animation. [GIF]. Retrieved from tor_animation.gif [3] Force Engineering. How Linear Induction Motors Work. [Photograph]. Retrieved from [4] A. Needham. A maglev train coming out of the Pudong International Airport. [Photograph]. Retrieved from coming_out,_pudong_international_airport,_shanghai.jpg [5] T. Zastawny. Simulated Linear Track Shot 1. [Photograph]. [6] T.Zastawny. Arc Length. [Drawing]. [7] T.Zastawny. Pole Pitch. [Drawing].
57 References # [8] M. Beirnat. Ideal Linear Synchronous Speed Vs. Frequency. [Graph]. [9] Electric Wholesale Motor. Lenze Tech MCH250B. [Photograph]. Retrieved from [10] T. Zastawny. System Block Diagram. [Drawing]. [11] T. Zastawny. Photo-interruptor. [Picture]. [12] T. Zastawny. Salient Pole. [Drawing]. [13] M. Beirnat. Ideal Linear Synchronous Speed Vs. Frequency. [Graph]. [14] M. Beirnat. Ideal Linear Synchronous Speed Vs. Frequency Differing Length. [Graph]. [15] T. Zastawny. Prior Senior Project. [Photograph]. [16] T. Zastawny. Simulated Linear Track Shot 2. [Photograph].
58 References # [17] T. Zastawny. Wiring Diagram. [Diagram]. [18] T. Zastawny. Wrapped Stator Teeth. [Photograph]. [19] T. Zastawny. Stator. [Photograph]. [20] T. Zastawny. Test Mounting. [Photograph]. [21] T. Zastawny. Wheel Mounting Side Shot. [Photograph]. [22] T. Zastawny. Stator Mounting and Lower Wheel Mounts. [Photograph]. [23] T. Zastawny. Cleaned Metal Vs Dirty. [Photograph]. [24] T. Zastawny. New Screws in Track. [Photograph]. [25] T. Zastawny. Simulated Linear Track Shot 1. [Photograph]. [26] T. Zastawny. GP/MR-200 Thermal Aging. [Graph]. [27] T. Zastawny. Mock Stator Tooth. [Photograph].
59 References # [28] T. Zastawny. Initial Lathe Wrapping. [Photograph]. [29] T. Zastawny. Second Lathe Wrapping. [Photograph]. [30] T. Zastawny. New Coil Shot 1. [Photograph]. [31] T. Zastawny. New Coil Shot 2. [Photograph]. [32] T. Zastawny. Slinky Effect Coil Shot. [Photograph]. [33] T. Zastawny. Collapsed Coil Shot. [Photograph]. [34] T. Zastawny. Salient Pole Arrangement. [Diagram]. [35] T. Zastawny. Non Salient Pole Arrangement. [Diagram]. [36] T. Zastawny. Final Stator Design. [Diagram]. [37] T. Zastawny. Final Presentation Gantt Chart. [Diagram].
60 References # [38] Star Connection Configuration [Photograph]. Retrieved From [39] T. Zastawny. Overall System Block Diagram. [Diagram]. [40] 4-Pole Machine Wiring Diagram [Photograph]. Retrieved From
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