Download presentation
Presentation is loading. Please wait.
Published byAbner Preston Modified over 9 years ago
1
S peed E stimation of I nduction M otors with R otor S lot H armonics 5 th International Scientific Conference on Energy and Climate Change Alfred PJETRI Ymer LUGA Myrteza BRANESHI Astrit BARDHI 11-12 October 2012, Athens Greece
2
Rotor Speed Monitoring in Induction Motors Conventional Techniques (Mechanical Speed Sensor ) Mathematical Model of IM (MRAS) Rotor Slot Harmonics SENSORLESS
3
C onventional T echniques D.C. Tachogenerators A.C. Tachogenerators Encoders Resolvers
4
Mechanical Sensor Disadvantages Increase the cost of control system Gives errors because of mounting Vibration Ingress of contaminant Reduces the system reliability
5
S ensorlees T echniques Mathematical Model of IM (MRAS) Rotor Slot Harmonics
6
M athematical M odel S ensorlees T echniques D isadvantages Nonlinearity of Magnetic Circuit Rotor and Stator Resistance Variation with Temperature
7
A ir G ap F lux of I nduction M achines
10
E.m.f. induced in stator winding.
11
A nalysis of R otor S lot H armonics.
13
Signal Measurement for Rotor Slot Harmonics
14
Fundamental frequency of voltage signal Induction Motor Rotor Speed in RPM
15
Eksperimental Setup Stand
16
Experimental Results Measured 1492 rpm Estimated 1490 rpm
17
Measured 1469 rpm Estimated 1466 rpm Experimental Results
18
Measured 1430 rpm Estimated 1431 rpm Experimental Results
19
C OMPARISON OF MEASURED AND ESTIMATED SPEED Nr. f s [Hz] f 1 [Hz] n estimated [rpm] n measured [rpm] Error [%] 1119250149014920.134 2118550148014770.203 3117450146614690.203 4116850145814540.275 51162501450 0 6115550144114420.069 7114750143114300.070 81137501418 0 9113150141014080.142
20
P [kW] n [rpm] U [V] I [A] cos f 1 [HZ] 314303806.90.8250 INDUCTION MOTOR RATED DATA Number of rotor slots Zr=46
21
C ONCLUSIONS Does not need mechanical sensor Maintenance free It is not affected by environment Do not depend of motor parameters Simple and robust method
22
THANK YOU
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.