http://ecatalog.weg.net/files/wegnet/WEG-motores-sincronicos-50027895-catalogo-espanol.pdf
https://tecnologiafuentenueva.wikispaces.com/file/view/motores_electricos.pdf
https://docs.google.com/file/d/0B7Mr7idWcO8tZWFiMzE4MDctNTIzMC00ZWU4LTgwYzYtOTdiMTc4ZTk4OGQz/edit
http://www.slideshare.net/oki1965/motor-ca
