In most of the research papers SVPWM techniques are used for PMSM and other motors after inverter transformation, instead of the PWM technique can I use Sine PWM techniques for motors?
Dear Santoshkumar,
with PWM the output voltage of frequency converter will be ca 15% less than supply voltage. It means your motor will work with under-voltage at rated speed. At the rated load, the motor will draw more current and the copper losses rise (~I^2). Also you do not get rated power of the motor any more. The motor gets too hot with PWM. You need to decrease motor power ca 20%. With centrifugal loads you can just reduce speed by some Hz. With SWPWM you do not loose the maximum voltage and motor power. Also using PWM is possible in some simple drive, if your motor rated voltage is sufficiently less than you can get with PWM. Principally, it is possible to get full voltage with PWM using overlaid 3rd harmonic. Danfoss had such a patent ca 25 years ago.
BR
Jüri
Dear Sir,
I am working on the application of Impedance source inverter (ZSI) in EV using PMSM...
As you mentioned "with PWM the output voltage of frequency converter will be ca 15% less than the supply voltage. It means your motor will work with under-voltage at rated speed' -- This can occur by using a traditional Voltage Source Inverter(VSI) based sine PWM, is it right?
but can I go with e Impedance source inverter (ZSI), is it possible to maintain the rated voltage and power at the rated speed by using Simple Boost PWM (SBPWM) instaed of SVPWM?
because in most of the papers of ZSI-PMSM, the SVPWM technique is used after inverse Clarke transformation?
Dear Santoshkumar,
yes, my answer has been about VSI, which is most common. CSI is much different of course. However, boosting the voltage will reduce CS inverter efficiency. By the way, with CSI you would need current vector control CVPWM, which is much different of SVPWM.
BR
Jüri
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