T840-012E59 Sanyo Denki
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The Sanyo Denki T840-012E59 is part of the T SANMOTION Servo Motors series and has a rated output of 400 Watts with a rated speed of 2500 per minute. It features a continuous stall torque of 1.70 Newton-meters and includes a 2500 pulse per revolution line driver encoder with 3 channels. The servo motor operates at a rated armature current of 5.8 Amps and a rated armature voltage of 85 Volts.
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Product Description:
The T840-012E59 servo motor is manufactured by Sanyo Denki and belongs to the T SANMOTION Servo Motors series. It is a permanent-magnet unit intended for compact machinery that requires repeatable speed and position control. When paired with a compatible digital drive, the motor supplies controllable torque for pick-and-place heads, small conveyors, and packaging axes. Its built-in incremental encoder provides the feedback required for closed-loop regulation, allowing the drive to correct motion in response to changing commands and loads.
Under continuous operation, the motor delivers 400 W of mechanical power at a shaft speed of 2500 rpm. This operating point corresponds to a steady output torque of 1.57 N·m, allowing the drive to execute motion profiles without exceeding the motor’s thermal limit. At this rating, the phase windings draw 5.8 A from an 85 V DC bus. The armature inductance of 1.9 mH moderates current ripple and allows the amplifier to use high-frequency pulse-width modulation without excessive reactive loss. These electrical and mechanical values help determine the continuous operating range for the connected load while accounting for the permitted motor temperature rise.
The armature resistance is 0.95 Ω, resulting in predictable copper loss that the thermal model must accommodate during acceleration or stall conditions. Position feedback has a resolution of 2500 P/R across three differential channels generated by a line-driver output, giving the controller 10,000-count quadrature interpolation for precise servo control. A torque constant of 0.314 N·m/A relates commanded current to developed torque. The mechanical time constant is 5.2 ms, and the rotor inertia is 0.50 × 10⁻³ kg·m², allowing the rotor to change speed quickly with limited overshoot. For static holding or low-speed operation, the continuous stall torque is 1.70 N·m. The voltage constant is 32.9 × 10⁻³ V/min⁻¹, which supports back electromotive force calculations during operation.
