I believe they are AC sinusoidal. There is no feedback so I would expect the torque reference to function something like applying a DC voltage to a DC servo? Or is it more like feeding it with a constant current supply?
With cogging I mean that the shaft is alternatingly difficult to turn or turns (almost) by itself a few times during one revolution. Like the steps of a stepper but far fewer. (I can understand why this happens but I'm not sure how strong it should be or if the term "cogging" is correct.)
What I find strange is that the motor is at a standstill, but then takes off at 1000 RPM just because I give it a spin by hand? And in any direction (without changing the torque reference?)
Arvid |