<p>Top 30 industrial electronics sites: </p>
<p>1. https://en.wikipedia.org/wiki/Variable-frequency_drive<br />
2. http://www.eaton.com/Eaton/ProductsServices/Electrical/ProductsandServices/AutomationandControl/AdjustableFrequencyDrives/index.htm?wtredirect=www.eaton.com/drives<br />
3. https://www.yaskawa.co.jp/en/product/ac<br />
4. https://www.ia.omron.com/products/category/motion_drives/servomotors_servo-drivers/<br />
5. http://www.schneider-electric.com/b2b/en/products/product-launch/altivar-process/<br />
6. http://www.deltaww.com/Products/CategoryListT1.aspx?CID=060101&PID=ALL&hl=en-US<br />
7. http://www.emersonindustrial.com/en-US/controltechniques/products/acdrives/Pages/acdrives.aspx<br />
8. https://dsc.lenze.de/dsc-core/index<br />
9. http://drives.danfoss.com/products/vlt/<br />
10. http://new.abb.com/drives/low-voltage-ac<br />
11. http://www.hitachi-america.us/ice/inverters/<br />
12. http://www.mitsubishielectric.com/fa/products/drv/inv/<br />
13. http://www.ti.com/solution/motor_control_ac_induction<br />
14. http://www.invertekdrives.it/solutions/case-study.aspx?caseStudyID=1<br />
15. http://ph.parker.com/de/en/ac-drives<br />
16. https://www.keb.de/drives/products-drives<br />
17. http://www.bosch.de/en/de/our_company_1/business_sectors_and_divisions_1/electrical_drives_1/electrical-drives.html<br />
18. http://www.vacon.com/ro-RO/Vacon/media/Articles/what-is-a-variable-speed-ac-drive/<br />
19. http://www.vesper.ru/catalog/invertors/<br />
20. http://www.rockwellautomation.com/es_EC/products-technologies/overview.page?<br />
21. https://www.sdsdrives.com/<br />
22. http://www.mielectric.com/brazil<br />
23. http://www.kbelectronics.com/Variable_Speed_AC_Drives_Inverters.html<br />
24. http://prom-electric.ru/articles/1/1/<br />
25. http://old.weg.net/us/Products-Services/Drives/Variable-Speed-Drives<br />
26. http://www.unicous.com/products/standard-drives<br />
27. http://powtran.kz/assets/8.pdf<br />
28. http://trikueni-desain-sistem.blogspot.kr/2013/09/Prinsip-Dasar-Inverter.html<br />
29. http://www.energysave.kg/en/proj_2013/137/<br />
30. http://www.conems.sd/index.php/services/building-automation-system-bas</p>
