BL-MC100J-20TNA Okuma
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The Okuma BL-MC100J-20TNA is a servo motor in the BL Servo Motors series with a rated motor output of 2 kW and a rated speed of 2000 min^-1. It features a torque rating of 100 kg/cm and uses a J-type encoder with a resolution of 1,296,000 pulses per revolution. The motor communicates via Okuma Encoder Link at a speed of 16 microseconds per frame.
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Product Description:
The BL-MC100J-20TNA is a brushless servo motor manufactured by Okuma for the BL Servo Motors series. It is intended for CNC axes and automated handling equipment that require repeatable rotary motion and integrated position feedback. An Okuma encoder monitors the motor shaft and sends synchronized position information to the drive and numerical control, allowing the control system to correct motion during precision positioning. The brushless design also supports controlled acceleration, deceleration, and continuous speed regulation without mechanical commutation.
This model delivers a rated mechanical output of 2 kW at a nominal shaft speed of 2000 rpm. It can apply up to 100 kgf·cm of torque to the connected load. Position feedback has a resolution of 1,296,000 pulses per revolution, allowing the controller to distinguish very small changes in shaft angle. The encoder transmits information through the proprietary Okuma Encoder Link, with frame updates occurring every 16 μs per frame. Communication uses two wires and a shield, providing the required signal path while helping protect encoder data from electrical interference. The motor and encoder arrangement supports closed-loop control for machine axes that require accurate positioning under changing speed and load conditions.
The data channel has a maximum transfer delay of 75 μs, keeping position information available within the response time required by the servo loop. Rotor feedback remains operational at speeds up to 6,000 rpm, providing measurement capacity above the motor’s nominal operating speed. The encoder electronics consume no more than 1 W and operate from a regulated 12 V DC ±30% power supply. Absolute multi-turn tracking covers 7,200 revolutions, allowing the controller to retain the shaft’s extended position across repeated rotations. Positional accuracy remains within 40 arcseconds, supporting precise angular measurement during commanded movement. The device uses a type J encoder format, and each telemetry cycle sends a complete 40-bit binary position value to the drive.
