Speed sensor required for Lab 5B?

Hello,

I am developing a motor control for a rotary compressor. I am working through the Insta-spin labs and everthing is ok until I get to Lab5B.  We have no speed feedback sensors -encoder or tach. Does the F28027 allow for self-sensored or field oriented control? I thought the InstaSpin chips used an estimate of the motor's backemf to get speed feedback. Is this wrong? Do I need to use a different chip?

Thanks,

Chuck