KA840BS0 Sanyo Denki
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The Sanyo Denki KA840BS0 is part of the K SANMOTION Servo Motors series and provides a rated output of 400 W with a rated torque of 1.53 N·m. It has a rated speed of 2500 min^-1 and features a 2000 pulse per revolution encoder resolution. The servo motor has a mass of 4.44 kg, a rated armature current of 5.7 A, and a brake torque of 1.96 N·m.
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Product Description:
The KA840BS0 servo motor is produced by Sanyo Denki within the K SANMOTION Servo Motors series. It is a permanent-magnet DC unit equipped with an electromagnetic brake and an incremental encoder, allowing motion controllers to position loads with high precision. In automated assembly cells, packaging stations, and small machining axes, the motor converts drive current into controlled rotary torque and supplies feedback for closed-loop regulation, while the brake maintains the load position when motor power is removed.
An armature resistance of 0.95 Ω represents the electrical load encountered by the drive during current rise, while the continuous stall torque of 1.70 N·m indicates the steady load the motor can hold without overheating. The winding draws 5.7 A from the rated armature supply of 85 V to reach a nominal operating speed of 2500 rpm, where the shaft delivers 1.53 N·m of torque. A torque constant of 0.31 N·m/A relates commanded current to produced torque, and the encoder provides 2000 P/R incremental pulses for position and speed feedback. Rotor inertia is 5.0 × 10⁻⁴ kg·m², providing moderate acceleration capability, while the assembled mass of 4.44 kg contributes to mechanical stability and heat dissipation. The brake coil has a resistance of 820 Ω, which controls current flow through the electromagnetic braking circuit during operation.
The holding function provides 1.96 N·m of brake torque, and the integrated brake coil operates with a supply of 90 VDC. This arrangement allows vertical or indexed axes to remain fixed after power to the motor amplifier is removed, provided that the brake circuit is connected and controlled correctly. For rapid load changes, the electromagnetic circuit can withstand a peak stall torque of 12 N·m, allowing brief bursts of force above the continuous rating. The motor also provides a continuous shaft output of 400 W, making it suitable for small conveyors, feeders, tooling spindles, and other compact motion axes. Its encoder feedback supports accurate speed correction and repeatable positioning during changing loads, while the brake secures the shaft during stops.
