US Patent 11561359 Balancing device for rotary apparatus

A balancing device for a rotary apparatus including a rotary body which is configured to pivot or swivel about at least one rotary shaft is provided. The balancing device includes a magnet assembly and a torque adjusting mechanism. The magnet assembly includes a combination of two or more magnets, and the torque adjusting mechanism is configured to adjust a torque generated by the combination of the two or more magnets. The balancing device generates an output torque in the form of a cosine curve or sine curve which optimally matches with an unbalancing torque of the rotary body. The balancing device has a small size and is invulnerable to fatigue failure.