Product Description:

The KA840XS0 is a brushless servo motor produced by Sanyo Denki for the K SANMOTION Servo Motors series. This motor serves as the driving element in industrial automation equipment that requires rapid acceleration, repeatable positioning, and synchronized motion. When matched with a suitable drive and feedback encoder, it converts electrical power into controlled mechanical torque, allowing conveyor lanes, packaging arms, and assembly robots to follow commanded motion profiles with precise speed and position control.

At its continuous operating point, the motor delivers 400 W of mechanical power while turning at 2500 rpm, producing 1.53 N·m of shaft torque. To reach that load point, the stator draws 5.7 A from an 85 V bus, which helps determine the required drive amplifier and wiring capacity. The built-in line-driver encoder outputs complementary differential pulses, and its resolution of 2,000 pulses per revolution supports tight velocity loops without requiring interpolation. Thermal Class F insulation withstands elevated winding temperatures during high-duty cycles. The armature has a voltage constant of 32.9 × 10⁻³ V per rpm, which indicates the back EMF generated as motor speed increases.

The rotor inertia is 5.0 × 10⁻⁴ kg·m², which supports fast starts while helping damp minor load disturbances. Electromotive behavior is further characterized by a torque constant of 0.31 N·m/A, an armature inductance of 1.5 mH, and an armature resistance of 0.95 Ω; these values affect current rise time, torque production, and heat generation. With a mass of 3.65 kg, the motor can be mounted on compact machine stages without adding excessive weight to the assembly. Its IP43 enclosure protects against solid objects larger than 1 mm and water sprayed at angles up to 60 degrees from vertical. Installation inside a guarded cabinet provides additional protection from direct exposure to contaminants and mechanical impact.