KA850BXX Sanyo Denki
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The Sanyo Denki KA850BXX is a servo motor in the K SANMOTION Servo Motors series. It has a rated output of 500 W, rated current of 7.4 A, and rated speed of 2500 min-1. The motor provides a continuous stall torque of 2.16 N·m and weighs 4.79 kg, with a rated voltage of 80 V and peak stall torque of 16.7 N·m.
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Product Description:
The KA850BXX is a brushless AC servo motor developed by Sanyo Denki within the K SANMOTION Servo Motors series. Engineered as a compact drive element, it converts commanded current from a servo amplifier into precise shaft torque and velocity for automated axes, pick-and-place heads, or indexing tables in industrial machinery. The motor operates from an 80 V DC bus provided by the matching SANMOTION amplifier, and its frame dimensions align with standard low-voltage, multi-axis platforms used on gantries, test handlers, and inspection stations.
Armature inductance of 0.86 mH sets the electrical time constant of the stator windings, allowing current to build quickly for responsive torque commands. The optional brake coil has a resistance of 820 Ω, supporting controlled brake operation without overheating when the shaft must remain locked. Under continuous stall conditions, the motor can produce 2.16 N·m, and it maintains a static holding torque of 1.96 N·m when energized but not rotating. The copper circuit has a winding resistance of 0.53 Ω, which limits thermal loss at the rated current of 7.4 A. The drive loop can command speeds up to 2500 rpm for medium-speed positioning lines.
Power output reaches 500 W, combining a rated torque of 1.91 N·m with nominal speed to provide mechanical power for cutting heads or package feeders. During fast transients, the electromagnetic system can deliver up to 16.7 N·m of peak stall torque, and this momentary burst draws a corresponding surge of 62 A from the amplifier before current limiting begins. A torque constant of 0.286 N·m/A relates commanded current to delivered torque, while a rotor inertia of 6.0 × 10⁻⁴ kg·m² supports rapid reversals without excessive overshoot. The motor weighs 4.79 kg, providing a balance between inertia matching and manageable installation in servo-controlled equipment.
