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Does an off the shelf electromechanical device exist that does rotary oscillations?

Similar to a torsion pendulum motion or a rotary spring but gets some energy supplied by electrical means to help keep it going? I do not mean an electric motor that can reverse direction as I do not want the motor to directly have to fight the current direction of angular momentum. Maybe it's something like a scotch yoke on an electric motor (however that is linear oscillator motion and I want it to be circular around a central axis - probably not exceeding 360 degrees).

If such an off the shelf device or mechanism does exist, what is it called?

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  • $\begingroup$ Use the motor, disc and pin from a scotch yoke to drive the load directly. Omit the sliding part of the yoke. $\endgroup$
    – Transistor
    Dec 3, 2023 at 9:26
  • $\begingroup$ An electric motor, with appropriate drive circuitry, would not "fight the current direction of" rotation. It could, in fact, be exactly what you need. Could you please edit your question with more information -- describing what you're actually trying to do with be best, but telling us what sort of torque you want to supply, at what frequency, whether you're supplying a spring, what the moment of inertia is and whether this device needs to suspend any mass will all -- partially -- suffice. $\endgroup$
    – TimWescott
    Dec 3, 2023 at 19:56

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