22893773 36 2 Field Orientated Control of a Multi Level PWM Inverter Fed Induction Motor
Reduction in Induction Motor Heating Fed by a New PWM Technique
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Transcript of Reduction in Induction Motor Heating Fed by a New PWM Technique
8/2/2019 Reduction in Induction Motor Heating Fed by a New PWM Technique
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Seminar Presentation on
Reduction in induction motor heating fed by a new
PWM technique
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Points to be covered:
1) What is PWM?
2) Why PWM to reduce harmonic losses?
3) Various PWM techniques
4) SPWM
5) HIPWM
6) HIPWM-FMTC
7) Laboratory Experimental Setup
8) Results
9) Conclusion
10) References
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What is PWM?
PWM- Pulse width modulation
Pulse-width modulation (PWM) is a very efficient way of providing intermediate amounts of
electrical power between fully on and fully off.
PWM can be used to reduce the total amount of power delivered to a load without losses
normally incurred when a power source is limited by resistive means.
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Why PWM?
Harmonics increase losses and cause heat problems in the machine resulting in wear of theinsulation covering the conductors and reducing the system’s performance.
Another adverse effect is that magnetic fields are produced in the yoke, some of which rotate
in the same direction as and others in the opposite direction to the main field, causing par
fluctuations, vibration and noise.
By PWM technique :
Control of inverter output voltage
Reduction of harmonics
Disadvantages of Harmonics :
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Various PWM techniques
SPWM (Sine Pulse width modulation)
HIPWM (Harmonic injection pulse width modulation)
HIPWM-FMTC(Harmonic Injection Pulse Width Modulation and Frequency
Modulated Triangular Carrier )
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SPWM
The most classic generated pulse width modulation
technique.
This involves a high frequency triangular signal as a carrier,
and a sinusoidal modulator with fundamental frequency
Comparing the two gives the sinusoidal pulse width
modulated signal (SPWM).
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Modulator wave Carrier Wave
Modulated wave
Sinusoidal pulse width modulation (SPWM); modulating wave
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Disadvantages of SPWM :
•Generates a fundamental term with small amplitude
• Significant amount of undesired harmonics.
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HIPWM
•This technique is born out of the SPWM.
•This technique consists of over modulating the sinusoidalmodulator .
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Modulator waveCarrier wave
Modulated wave
Harmonic injection pulse width modulation (HIPWM);modulating wave, carrier wave andresulting modulated wave
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HIPWM-FMTC
•Harmonic Injection Pulse Width Modulation and FrequencyModulated Triangular Carrier (HIPWM-FMTC)
•This new technique uses an identical modulator to the one
used with the HIPWM technique, and an instantaneous
frequency triangular signal as the carrier
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Carrier Wave
Modulator wave
Modulated wave
Harmonic Injection Pulse Width Modulation and Frequency Modulated Triangular Carrier”(HIPWM-FMTC); modulating wave, carrier wave and resulting modulated wave.
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Laboratory Experimental Setup
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Results
Time
(min) SPWM HIPWM HIPWM
-FMTC
0 22.0 22.0 22.0
10 25.3 25.3 25.2
20 28.2 28.1 28.1
30 30.2 30.0 29.5
40 31.2 31.0 30.4
50 31.9 31.7 31.1
60 32.3 32.0 31.4
70 32.4 32.1 31.5
80 32.4 32.1 31.5
90 32.5 32.2 31.6
Table of temperatures measured in the AC-motor stator in the test performed With 50%
charge.
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Results continued :
Time
(min) SPWM HIPWM
HIPWM-
FMTC
0 22.0 22.0 22.0
10 23.9 23.9 23.9
20 26.8 26.6 26.2
30 27.3 27.2 26.8
40 27.7 27.6 27.2
50 28.0 27.8 27.3
60 28.1 27.9 27.4
70 28.1 27.9 27.4
80 28.1 27.9 27.4
90 28.1 27.9 27.5
Table of temperatures measured in the AC-motor stator in the test performed With 25%
charge.
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Conclusion
The technique (HIPWM-FMTC) has a clear advantage
over the other traditional PWM techniques in terms of heating the motor.
This is due to the lower content of harmonics.
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References
[1] Reduction in induction motor heating fed by a new PWM technique: results obtained inlaboratory experiments. By M. J. Meco-Gutiérrez , A. Ruiz Gonzalez ,F. Vargas-Merino ,J.R. Heredia-Larrubia . [2] Design of a High Performance Three-phase UPS with Unity Input Power Factor and High DC-
Voltage Conversion Ratio
By Wen-Inne Tsai, York-Yih Sun, and JiaYou Lee Control System Laboratory, Department of Electrical Engineering, National Cheng KungUniversity, Tainan, Taiwan [3] Shaping the HIPWM-FMTC strategy to reduce acoustic noise radiated by Inverter- Fed
Induction Motors By Antonio Ruiz-González, Mario J. Meco-Gutiérrez,Francisco Vargas-Merino,Francisco Pérez-
Hidalgo,Juan Ramón Heredia