| Abstract |
A common problem to face in designing any electric motor drive today consists in forcing the
generated electromagnetic emissions to stay inside the boundaries stated by recently introduced
electromagnetic compatibility standards. Conventional design approaches cope with such a problem
by adding suitable filters on standard power stages. Alternatively, specific power stage design
techniques can be applied allowing to obtain better results in terms of power converter costs,
reliability and sizes. Along this way, a viable alternative to the EMC filters approach consists in
exploiting optimized PWM strategies, allowing to reduce the generated electromagnetic pollution.
The present paper points out the advantages in using Variable Frequency Pulsewidth Modulation
Techniques instead of conventional, fixed frequency approaches, in terms of generated high
frequency stray current components, that are the main responsible of conducted electromagnetic
emissions. Particularly, an experimental comparative evaluation is presented between conventional
modulation techniques and different variable frequency approaches. |
