BL-25E-30T Okuma
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The Okuma BL-25E-30T is a servo motor from the BL Servo Motors series and features a 4-pole design. It uses the ER-FC-2048D encoder model with a FC Absolute Position encoder type, providing 16384 clock pulses per 0.1 revolution. The motor operates with an encoder clock of 81.92 MHz and an encoder excitation frequency of 5 kHz.
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Product Description:
The BL-25E-30T is a servo motor produced by Okuma and supplied within the BL Servo Motors series. It is intended for axis control in machine-tool and general automation platforms where tight position feedback is required. By pairing the rotor with an integrated absolute encoder, the motor delivers closed-loop positioning that avoids accumulated error after power cycles, making it suitable for multi-axis lathes, milling centers, and coordinated gantry drives. This feedback arrangement also supports repeatable indexing and controlled contouring in systems that must return to known positions after shutdown.
High-resolution feedback is obtained from the encoder count of 16384 clock pulses per 0.1 mechanical revolution, which equals 163,840 pulses per full turn and allows very fine position tracking at the controller. Internal timing is synchronized by an encoder clock of 81.92 MHz, so the feedback chain can report position changes with very low latency during rapid traverses. Excitation of the sensing electronics is carried by a reference carrier at 5 kHz, a frequency that helps maintain stable signal transmission while resisting external noise. The sensing assembly is identified as model ER-FC-2048D, which combines optical tracks and a serial output stage in one housing. Position data is delivered in the FC Absolute Position format, allowing the controller to read the motor angle immediately after power is restored without a homing cycle.
Multi-turn capacity is provided by an encoder turnover length of 2048 rev, allowing the machine to move through long travel ranges before the absolute count repeats. The electromagnetic section uses 4 poles, which balances torque density with a moderate electrical frequency requirement from the drive. For backup commutation, a resolver track produces a phase change every 36°, providing an alternate reference if the optical channel becomes temporarily unavailable. This secondary feedback path helps the drive maintain reliable rotor position information during startup and during brief signal disturbances.
Frequently Asked Questions about BL-25E-30T:
Q: What type of encoder does the BL-25E-30T servo motor use?
A: The BL-25E-30T servo motor uses the FC Absolute Position encoder type for precise motion feedback.
Q: Which encoder model is featured on the BL-25E-30T motor?
A: The encoder model ER-FC-2048D is implemented in the BL-25E-30T for accurate position tracking.
Q: What is the pole count of the BL-25E-30T servo motor?
A: This servo motor has a pole count of 4, supporting efficient operation and torque generation.
Q: How many clock pulses per 0.1 revolution does the BL-25E-30T provide?
A: The BL-25E-30T offers 16384 clock pulses per 0.1 revolution, ensuring high resolution for precise positioning.
Q: What is the encoder turnover for the BL-25E-30T servo motor?
A: This model's encoder turnover is rated for 2048 revolutions, supporting multi-turn absolute positioning tasks.
