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Actually, the control engineering article seems to say they're no good for position control servo applications.
Yeah, there seems to be some mixed info out there on some aspects of these things. I guess it's one thing to "behave like a stepper motor" and another to be "useful as a stepper motor". :-) On the other hand, while searching for some of those links, I ran across references to several papers by Japanese robotics researchers on using SR motors for positioning of joints in biped robots so it may depend on type of control circuit being used. The SR motors were controlled by mechanical relays while the motor in Dyson's vacuum cleaner is computer controlled.
We are using BLDC motors in our robots for quite some time (Barbora, Dana). How the motor behaves depends completely on the control electronics. The motor can be used as a stepper but with our motor you would get only 18 steps/rotation. When operating without a sensor (encoder) it is also almost impossible to achieve slow speeds (as I was told by the company that made the sensorless motor controllers :)). That's why we are building a new controller with encoder. Is anyone experienced in this area? We could use some help :).
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