Would like to convert a baby bouncer (like this one), which requires continuous manual effort to rock it, into one that use electro-mechanical means to auto-bounce. However, my aim is to make these on the cheap (as all of my other projects so far have). So I am on the look out for alternative design approaches or parts.
My idea is to place a low RPM, high torque (unable to quantify, since I've not work with DC motors, beyond the ones found in small toy cars etc.), DC motor (brushless?), which periodically winds (like a winch) pulling the bouncer seat to the low-position, and then (here is where, I am not sure, it is right or feasible to do with standard DC brushless motor), just de-energise the motor, for the bouncer to bounce up, and have few naturally dampened oscillations (bounces), and then repeat the process.
Is the above approach correct ? Will de-energising the motor, and the rapid unwinding in opposite direction, make it act like a dynamo and feed current back into the circuit ? Can that harm the motor ? Will stepper motor be a better approach ?