KA840TXX Sanyo Denki
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The Sanyo Denki KA840TXX is a servo motor in the K SANMOTION Servo Motors series with a rated output of 400 W and a rated speed of 2500 rpm. This motor features a rated torque of 1.53 Nm, rated armature voltage of 85 V, and a mass of 3.85 kg. It also has a rated armature current of 5.7 A and an overall length of 183 mm.
Internal Product Review
The KA840TXX is a Sanyo Denki K SANMOTION servo motor with 400 W rated output and 2500 min^-1 rated speed. A 1.53 N·m rated torque and 0.31 N·m/A torque constant support responsive, efficient axis control. A strong choice for motion systems requiring stable servo performance.
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Product Description:
The KA840TXX is a DC servo motor produced by Sanyo Denki within the K SANMOTION Servo Motors series. In automated machinery, the unit provides closed-loop shaft positioning and speed regulation, allowing controllers to move loads along programmed trajectories without mechanical gearing changes. The motor delivers a rated mechanical output of 400 W, indicating the continuous power available at the shaft under nominal operating conditions. Its compact design supports applications that require controlled rotary motion in automated production equipment.
When the rotor turns at its rated speed of 2500 min-1, the drive line receives a steady torque of 1.53 N·m. The windings draw a rated armature current of 5.7 A from a drive that supplies 85 V while producing this torque. Back electromotive force at the terminals rises in proportion to speed, with a voltage constant of 32.9 ×10-3 V·min-1. This value helps with sizing the regenerative capacity of the power stage and influences feedback scaling. The relationship between speed and terminal voltage also allows the connected drive to account for the motor’s electrical behavior during acceleration and deceleration.
The torque constant of 0.31 N·m/A links commanded current to produced torque, simplifying control-loop gain calculations. Electrical losses are affected by an armature resistance of 0.95 Ω, while current response is influenced by an armature inductance of 1.5 mH. These electrical properties result in a time constant of 1.5 ms, allowing current to settle quickly after a setpoint change. A rotor inertia of 5.0 ×10-4 kg·m² and a mechanical time constant of 4.8 ms support rapid acceleration with controlled response. The motor body has an overall length of 183 ±2 mm and weighs 3.85 kg, making it suitable for gantry or end-effector mounting where moving mass must be limited. Tachometer feedback is available through a coefficient of 7 ×10-3 V·min-1, allowing direct velocity measurement when precise speed adjustment is required.
