KA840JXX Sanyo Denki
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The Sanyo Denki KA840JXX servo motor is part of the K SANMOTION Servo Motors series and has a flange size of 88 millimeters square with a mass of 4.64 kilograms. It features a continuous stall torque of 1.70 Newton-meters and a peak stall torque of 12 Newton-meters, with an IP43 protection rating. The motor is rated for 400 watts output power, 85 volts armature voltage, and 2500 rpm rated speed with a rated armature current of 5.7 amps.
Internal Product Review
The KA840JXX is a Sanyo Denki K SANMOTION servo motor with 400 W rated output and 2500 min-1 rated speed. Torque performance is especially appealing, with 1.53 N·m rated torque and 12 N·m peak stall torque. IP43 protection supports dependable integration in industrial equipment, making KA840JXX a highly capable motion-control choice.
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Product Description:
The KA840JXX is a brushless servo motor manufactured by Sanyo Denki as part of the K SANMOTION Servo Motors series. Designed for industrial automation, it converts electrical energy from a matched drive into regulated mechanical rotation for indexing tables, pick-and-place axes, and other precise motion tasks. The permanent-magnet rotor and wound stator support closed-loop speed and torque control, allowing repeatable positioning while minimizing drivetrain size. This operating principle also provides responsive motion across changing loads and commanded speeds.
The armature circuit has an inductance of 1.5 mH, which filters current ripple, and a winding resistance of 0.95 Ω, which affects steady-state copper losses. Under continuous stall conditions, the shaft can hold 1.70 N·m without exceeding its thermal limit. The rated operating point provides 1.53 N·m at 2500 rpm when the drive supplies 5.7 A. The square 88 mm flange aligns with compatible gearheads and provides a stable mounting surface. The IP43 enclosure protects internal components against solid objects larger than 1 mm and water sprayed at angles of up to 60 degrees from vertical. Proper drive matching and thermal management are required to maintain continuous operation within these values.
During rapid acceleration, the motor can produce a peak stall torque of 12 N·m, providing short bursts of force for overcoming static friction and accelerating connected loads. Torque rises in proportion to current at a constant of 0.31 N·m/A, allowing the controller to calculate motor output from the commanded current. The winding operates from a DC bus voltage of 85 V, and the motor provides a rated mechanical output of 400 W. A rotor inertia of 5.0 × 10-4 kg·m² supports quick response while maintaining smooth rotation, and the motor has an overall mass of 4.64 kg. The generated back electromotive force corresponds to a voltage constant of 32.9 V per 1,000 rpm, providing the drive with a signal that varies in proportion to motor speed. These transient characteristics support short acceleration intervals without treating peak output as a continuous operating condition.
