KA840BXX Sanyo Denki
Wake Industrial LLC is not an authorized distributor of this product.
The Sanyo Denki KA840BXX is part of the K SANMOTION Servo Motors series and has a flange size of 88 mm square with a mass of 4.20 kg. It delivers a rated output of 400 W, a rated speed of 2500 min^-1, and a continuous stall torque of 1.70 N·m. The motor features an armature inductance of 1.5 mH and operates at a rated armature voltage of 85 V.
Internal Product Review
The KA840BXX is a Sanyo Denki K SANMOTION servo motor with 400 W rated output and 2500 min^-1 rated speed. Torque capability is impressive, with 1.53 N·m rated torque and 12 N·m peak stall torque supporting accurate motion under changing loads. Brake control at 90 VDC and 1.96 N·m holding torque adds dependable axis retention, making this motor a well-balanced servo solution.
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Product Description:
The KA840BXX is a DC servo motor built by Sanyo Denki for the K SANMOTION Servo Motors series. As a compact motor with an 88 mm square mounting flange, it supplies closed-loop rotary motion to positioning stages, conveyors, and pick-and-place arms in automated equipment. Within an axis, the motor converts regulated armature current from the drive into precise shaft torque, enabling the coordinated motion profiles required by industrial controllers.
At its continuous operating point, the motor delivers 400 W of mechanical power while spinning at 2500 rpm. This output is produced with a shaft torque of 1.53 N·m when the drive supplies an armature voltage of 85 V and a current of 5.7 A. An armature winding resistance of 0.95 Ω helps the drive estimate thermal rise, while the 1.5 mH inductance shapes current ripple for smoother torque production. The rotor inertia of 5.0 × 10⁻⁴ kg·m² works with the moderate resistance and inductance to support responsive acceleration without excessive overshoot. A holding torque of 1.96 N·m helps keep loads stationary when the integrated brake is engaged. The electrical and mechanical characteristics also allow the drive to regulate torque during changes in speed or load.
For short transients such as rapid indexing, the motor can produce a peak stall torque of 12 N·m, while its continuous stall torque is 1.70 N·m for static holding under rated operating conditions. A built-in electromagnetic brake rated at 90 V DC engages with 0.11 A of coil current, preventing back-driving on vertical axes when power is removed. The overall assembly mass is 4.20 kg, making the motor suitable for gantries or robot joints that require low moving weight and high torque density. The brake supports controlled load retention when the drive can no longer apply active shaft torque. Its available peak torque also accommodates brief acceleration and deceleration demands that exceed the continuous operating level.
