BL-MH301E-20SB Okuma
Wake Industrial LLC is not an authorized distributor of this product.
The Okuma BL-MH301E-20SB is a brushless servo motor from the BL Servo Motors series. It features a rated output of 6 kW and a rated current of 25.6 Arms. The motor uses a direct-mounted absolute position encoder for speed and position feedback, and it has a winding resistance of 0.21 Ohms at 68 degrees Fahrenheit.
Internal Product Review
The BL-MH301E-20SB is an Okuma brushless servo motor with a 6 kW rated output, making it a strong choice for demanding motion systems. An absolute position encoder with speed and position feedback gives the motor excellent control quality in precision applications. High-resolution feedback at 16384 clock pulses per 0.1 rev is a standout feature for accurate servo performance.
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Product Description:
The BL-MH301E-20SB is a servo motor produced by Okuma within the BL Servo Motors series. It is designed as a brushless rotary actuator for CNC axes and other motion loops that demand closed-loop control of position and velocity. In an automation cell, the motor couples directly to a machine shaft and supplies the commanded torque, while its integrated encoder returns precise rotor position data to the drive for synchronous correction.
The electromagnetic section is rated for 6 kW of continuous mechanical output, and the stator draws a nominal phase current of 25.6 Arms when that load is applied. Copper loss inside the windings is limited by a resistance of 0.21 Ω measured at 68 °F, helping the drive estimate temperature rise. A brushless topology eliminates commutator wear and supports higher-speed operation with reduced maintenance. Rotor position is quantized by an encoder that produces 16,384 clock pulses per 0.1 revolution, giving fine resolution for contouring moves. The controller uses these electrical and feedback values to manage rapid acceleration, smooth interpolation, and accurate steady-state holding. Closed-loop feedback also allows the drive to correct positional deviations as operating loads change.
The absolute encoder tracks position over a full 2,048-revolution range before rollover, and its carrier operates at 5 kHz to maximize the signal-to-noise ratio. Each phase transition of the output shaft occurs in fixed 36° mechanical steps referenced by the commutation table, while the device supplying rotor data is an absolute position encoder mounted directly to the motor end bell. Installation uses an M5 bolt on the encoder shaft, and the feedback function reports both speed and position to the Okuma drive. The direct encoder mounting reduces the effect of mechanical play between the rotor and the feedback device. This arrangement supports precise correction of shaft motion during contouring, indexing, and other coordinated machine movements.
