During the rotation of the flexible wheel with the wave generator, when one of the teeth is meshed from one of the teeth of the rigid wheel to the tooth of the rigid wheel again, the flexible wheel just rotates for one circle, and at this time, the wave generator rotates a lot of circles. The ratio of the number of turns of the wave generator to the number of turns of the flexible wheel (1 circle) is the reduction ratio of the harmonic gear reducer, so its reduction ratio is very large. In the whole process of movement, the deformation of the flexible wheel is a continuous simple harmonic wave on the expansion diagram of the flexible wheel circumference. Therefore, this transmission is called harmonic gear transmission.
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