A wave generator, a circular spline with inner teeth, and a flexspline with outer teeth make up a harmonic drive system. Harmonic drives are incredibly small and lightweight. The lack of backlash caused by the distinctive design of a harmonic drive is just one of its numerous benefits. Because of how they operate, harmonic drives are a form of gear configuration that is frequently called strain wave gears. Very high precision reduction ratios are made possible by the harmonic drive's components interacting in a way that would otherwise require more complicated and substantial mechanisms.
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