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Not synchronous, nor high torque.

The Papst motors are not synchronous, nor are they high torque.

They are hysteresis or eddy current motors which run about 3-5% slower than synchronous speed. The exact speed depends on the torque load - higher loads cause greater slip.

At the midpoint on the speed / torque curve, the motor is putting out less than two watts, which is equivalent to about 10 mNm of torque at this speed. This is less torque than the common AC synch motors. The advantage the Papst motors have is that they run at higher speed, increasing the gearing ratio up to the platter which in turn increases the reflected torque and the reflected rotational inertia.


Mark Kelly

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