Mitsubishi Electric HG-KR73BJ HG-KR Series AC Servo Motor

Optimizing dynamic response in high-performance motion control systems, the Mitsubishi Electric HG-KR73BJ AC Servo Motor provides precise positioning capability within the MELSERVO-J4 automation platform. This low-inertia, small-capacity rotary motor is engineered with an integrated electromagnetic brake and a factory-installed oil seal, making it highly suited for vertical axis applications and environments requiring protection against fluid ingress.

Key Features

• Low Inertia Design: Optimized for high-frequency positioning cycles and rapid acceleration/deceleration profiles.
• Electromagnetic Holding Brake: Integrated brake (B-suffix) ensures secure position retention during power-off states, preventing vertical axis drop.
• Integrated Oil Seal: Factory-fitted shaft oil seal (J-suffix) prevents gear lubricant or cutting fluid migration into the motor housing.
• High-Resolution Feedback: Compatible with absolute/incremental encoders to deliver sub-micron positioning accuracy.
• Industrial Protection: Designed to withstand challenging industrial environments when paired with appropriate IP-rated cabling.

Typical Applications

• Vertical axis drive systems requiring safety holding brakes.
• Packaging, filling, and sealing machinery.
• High-speed material handling gantries and pick-and-place systems.
• Semiconductor manufacturing and PCB assembly equipment.

Technical Specifications

Empirical Engineering Insights

Alternative Models & Compatibility

The HG-KR73BJ is designed for direct pairing with the MR-J4-70A, MR-J4-70B, or MR-J4-70GF servo amplifiers. When migrating from legacy HF-KP series motors, note that parameter adjustments are required in MR Configurator2 to accommodate the higher-resolution encoder feedback and different physical inertia ratios.

Application Pitfalls & Engineering Notes

The integrated electromagnetic brake is strictly a holding brake and must never be used for dynamic deceleration or emergency stopping of moving loads. Repeated dynamic braking cycles will wear out the friction plates, leading to holding failure. Ensure the control sequence releases the brake prior to enabling the servo amplifier drive stage.

Commissioning & Wiring Tips

Always route the encoder feedback cable separately from the high-voltage motor power and brake cables to prevent electromagnetic interference. Ensure the motor frame is grounded directly to the servo amplifier's protective earth (PE) terminal to eliminate high-frequency noise currents.

Installation Guidelines