Product Description:

The T840-012 is a brushless servo motor produced by Sanyo Denki as part of the T SANMOTION Servo Motors series. It converts commanded current from a drive into precise shaft torque and speed, enabling closed-loop control of linear stages, conveyors, and articulated mechanisms in industrial automation. Electrical, thermal, and mechanical parameters are balanced for continuous operation on assembly lines, pick-and-place cells, and packaging equipment where repeatable positioning and medium power density are required.

During nominal operation, the motor delivers a shaft power of 400 W at a rated speed of 2500 rpm. At that operating point, it produces a continuous torque of 1.57 N·m while drawing a phase current of 5.8 A from a DC bus regulated by the drive to 85 V. The continuous stall torque is 1.70 N·m, indicating the motor's holding ability when motion is commanded to zero. A torque constant of 0.314 N·m/A links drive current to mechanical output, and a rotor inertia of 0.50 × 10⁻³ kg·m² supports rapid acceleration without unstable overshoot. The mechanical time constant is 5.2 ms, so speed settles quickly after a step change. The motor has a mass of 3.4 kg, allowing cabinet-mounted actuators to keep their overall payload moderate.

The motor can generate a peak shaft torque of 12.0 N·m when the drive momentarily supplies up to 40 A. Magnetic behavior is characterized by an armature inductance of 1.9 mH and a winding resistance of 0.95 Ω; together, these values shape the electrical time constant and influence current-loop bandwidth. The voltage constant is 32.9 × 10⁻³ V per rpm, which supports back-EMF estimation inside the servo drive and accurate field-oriented control during rapid speed changes. These electrical values help the drive regulate current as motor speed and load conditions change. The available peak torque supports brief acceleration demands that exceed the motor's continuous operating torque.