MITSUBISHI HG-H453BS-D51 AC Servo Motor 3500rpm 4.5kW Brake D51

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The MITSUBISHI HG-H453BS-D51 is a high-performance AC servo motor designed for CNC machine tools and industrial automation systems that require precise motion control and reliable positioning. With a rated output of 4.5 kW and a nominal speed of 3500 rpm, it delivers the torque and responsiveness needed for heavy-duty axes, high-speed positioning, and demanding production environments.

This model is equipped with an integrated D51 holding brake, which helps maintain axis position when power is removed and prevents unwanted movement during machine shutdowns, emergency stops, or maintenance procedures. The brake is particularly valuable on vertical axes and load-holding applications where secure positioning is essential for both safety and process reliability.

The motor incorporates an OSA405S5AS absolute encoder with a resolution of 4,194,304 pulses per revolution, providing highly accurate position feedback for closed-loop servo control. When paired with a compatible MITSUBISHI MELSERVO amplifier, the HG-H453BS-D51 delivers precise positioning, smooth motion, and stable torque performance for feed axes, rotary tables, indexing systems, and other precision motion applications.

Featuring a 176 mm square flange and a straight shaft, this servo motor is commonly used as a direct replacement for identical models installed on machining centers, CNC lathes, grinding machines, automated fixtures, and industrial positioning equipment. Matching the complete motor reference ensures compatibility with the existing encoder configuration, brake option, connector layout, and drive parameters, allowing maintenance teams to perform efficient replacements with minimal system modifications.

Manufactured in Japan, the HG-H453BS-D51 is widely selected for maintenance and retrofit projects involving critical machine axes. It is often used to replace motors affected by bearing wear, insulation deterioration, brake malfunctions, encoder faults, or other age-related failures. Many maintenance departments keep this exact reference in spare inventory to minimize downtime and ensure rapid recovery during unexpected machine stoppages.

Each motor can be tested with a compatible servo amplifier to verify motor operation, encoder feedback accuracy, and brake functionality before shipment. Depending on availability, the motor may be supplied as a replacement, tested, refurbished, or exchange unit. Repair services may also be available to support legacy CNC systems and help extend the operational life of existing industrial equipment.

Frequently asked questions about HG-H453BS-D51:

Which servo amplifiers are typically used with this motor
Use a MITSUBISHI MELSERVO amplifier sized for the 4.5 kW class and matched to the encoder and option code. Always verify compatibility in the drive manual against the full motor reference.

Does this model include a holding brake and where is it used
Yes, the D51 option designates an integrated holding brake. It is commonly applied on Z axes or any load that must remain fixed at standstill for safety and accuracy.

Is it a drop-in replacement for a similar HG series motor with a different suffix
Treat the full code as mandatory. Differences in suffixes can change encoder spec, connectors or mechanical options. Match the exact reference to ensure a true drop-in replacement.

What should be checked before installing the replacement unit
Confirm flange dimensions, shaft features, keyway, connector orientation and encoder option against the removed motor and the installed drive. This avoids misalignment and speeds up commissioning.