Product Description:

The KA850JS0 is a brushless AC servo motor manufactured by Sanyo Denki within the K SANMOTION Servo Motors series. Designed for closed-loop industrial automation, the unit converts electrical power into controlled rotational motion for positioning tables, feeders, and similar equipment. An integrated electromagnetic brake permits static holding of the load when power is removed, while the built-in incremental encoder supplies feedback so a drive can regulate speed and torque accurately in real time.

The electromagnetic section operates with an armature supply of 80 V and 7.4 A, corresponding to a continuous shaft output of 500 W. At that operating point, the rotor turns at 2500 rpm and delivers 1.91 N·m of torque. The low winding resistance of 0.53 Ω limits I²R losses, helping the motor stay within its temperature class limits during extended cycles. Position feedback is provided by a line-driver encoder that generates 2,000 pulses per revolution, allowing the controller to resolve fine increments at the rated speed. When power is removed, the brake circuit draws only 0.11 A, minimizing the load on auxiliary 24 V supplies.

Dynamic performance includes a peak stall torque of 16.7 N·m, providing more than eight times the rated torque for acceleration or disturbance rejection. The continuous stall capability is 2.16 N·m, so the motor can hold a slightly higher load than it produces at nominal speed without exceeding temperature limits. A torque constant of 0.286 N·m/A links drive current directly to mechanical output, simplifying current-mode control loops. The rotor inertia of 6.0 × 10⁻⁴ kg·m² balances fast step response with stable servo behavior, while the brake provides 1.96 N·m of holding torque to secure vertical axes. The motor has a mass of 5.50 kg, which must be considered when sizing mechanical supports and cable chains.