Mitsubishi FFR-SI-8.3A-SS1 AC Rotary Servo Motor for MELSERVO J2S Series

The Mitsubishi FFR-SI-8.3A-SS1 (FFR-SI-8.3A-SS1) is a brushless AC rotary servo motor engineered for high-performance motion control within the MELSERVO J2S series. Designed for demanding automated machinery and precision drive applications, this motor delivers a rated output of 22 kW with a rated torque of 140 Nm at an operating speed of 1,500 rpm. It is powered by a 400 V AC supply voltage class with a rated current draw of 63 A, ensuring steady dynamic response and reliable continuous output across heavy industrial loads. The motor features a straight shaft configuration with an integrated oil seal and is equipped with a built-in 17-bit absolute feedback encoder that provides high resolution equivalent to 131,072 pulses per revolution. Built to IP44 protection standards, the mechanical assembly utilizes a 280 x 280 mm mounting flange for rigid, standardized machine installation. Although discontinued by the manufacturer, this genuine Mitsubishi unit provides an exact-fit replacement solution to maintain positioning accuracy and drive reliability in legacy production environments.