Harmonic Drive Systems Inc. produces and sells precision control equipment and components worldwide. It offers speed reducers, rotary actuators, linear actuators, AC servo motors, and other mechatronics products, as well as otors, sensors, drivers, controllers, and other system elements. The company also provides HarmonicDrive, a speed reducer for space; high-precision planetary speed reducers under the AccuDrive and Harmonic Planetary brands; and high-performance gear heads for servo motors series. Its products are used in industrial robots, semiconductor manufacturing equipment, and other systems. Harmonic Drive Systems Inc. was founded in 1970 and is headquartered in Tokyo, Japan.

HARMONIC DRIVE SYS INC