High Performance Driver P7
It has been assumed so far in all the considerations of induction machine and SPMSM vector control that a speed (or position) sensor is available and that it provides the required feedback signal for closed loop speed control (and the speed/position information for co-ordinate transformation, where required). Sensors mounted on the machine shaft are in general not desirable for a number of reasons. First of all, their cost is substantial. Secondly, their mounting requires a machine with two shaft ends available - one for the sensor, and the other one for the load coupling. ...
