@user16307: Since you have mentioned "motors" and "power electronics" I like to direct your attention to "POWERSIM" from www.powersimtech.com". This simulation package is really easy to use and it has its focus on power electronics. If you visite the mentioned website you can download a working demo version which is limited (as far as I know) to circuits with not more than 35 parts in total.
Remark: The program has a lot of good tutorial examples onboard.