Yaskawa Electric Corporation USASEM-03-YR21 AC Servo Motor

The Yaskawa USASEM-03-YR21 AC servo motor, equipped with the UTMAH-B15AS19B absolute encoder, is a brushless servo motor in the USASEM series engineered for precise speed and position regulation in Motoman robot axis control with MRC controllers. It delivers a ~300 W class rated power, a ~3000 RPM top speed, and runs from ~200 VAC, all in a flange-mount, totally enclosed, self-cooled package designed for continuous operation in industrial automation. Its low-inertia design enables fast acceleration and accurate positioning, making it well suited for robotic welding, material handling, CNC machinery, and automated production lines where coordinated axis motion and encoder feedback are essential. Common replacements include Yaskawa USASEM-03-YRS21, SGMPH-03A1A-YR11, and SGMJV-04ADA21.