Product Overview

The MITSUBISHI HG-KR73 is a low-inertia, small-capacity servo motor from Mitsubishi Electric's MR-J4 series, designed for high-precision motion control in industrial automation. With its compact structure, superior dynamic performance, and robust environmental adaptability, this motor is widely used in robotics, CNC machines, packaging equipment, and other industries, making it a core component of modern smart manufacturing.

Key Specifications & Technical Data

Basic Performance

• Rated Power: 750W

• Rated Speed: 3,000rpm (Max. Speed: 6,900rpm)

• Rated Torque: 2.4N·m (Peak Torque: 8.4N·m, 350% overload capacity)

• Encoder Resolution: 22-bit absolute/incremental encoder (4,194,304 pulses/rev), enabling micron-level positioning

• Protection Class: IP65 (Fully enclosed, self-cooled structure for harsh environments)

• Weight: 2.8kg (standard), 3.8kg (with electromagnetic brake)

• Electrical Specs: Rated voltage 200V, rated current 4.8A, max. current 17A

Core Features

1. High-Precision Control

   • Advanced permanent magnet synchronous motor (PMSM) technology and high-resolution encoder ensure precise position, speed, and torque control, meeting stringent requirements in semiconductor manufacturing and precision machining.

   • Absolute position encoding eliminates cumulative errors, ensuring long-term accuracy.

2. Rapid Dynamic Response

   • Low-inertia design enables a response frequency of up to 3.5kHz, ideal for high-frequency start-stop and speed-change applications in automated production lines.

3. Electromagnetic Brake (Select Models)

   • Models like HG-KR73BJ feature a non-excitation spring brake (DC24V), providing 2.4N·m static friction torque and a 0.04-second braking response time for safe emergency stops.

4. Environmental Durability

   • IP65 rating ensures resistance to dust, oil mist, and high temperatures (130°C), suitable for food packaging and metalworking.

   • Fully enclosed structure prevents contaminant ingress, extending service life.

5. High Power Density

   • Compact size with large power output saves installation space, ideal for robotic arms and compact CNC machines.

Application Fields

1. Industrial Robotics

Robotic Arm Drive: Powers joint movements in six-axis robots for welding, assembly, and painting.

Collaborative Robots (Cobots): Low inertia ensures safety and flexibility in human-robot collaboration.

2. CNC Machines

Feed Axis Control: Drives tool or worktable movement for micron-level cutting accuracy.

Spindle Drive: Supports high-speed machining (e.g., 6,000rpm+) when paired with high-speed spindles.

3. Automated Production Lines

Conveying & Positioning: Ensures precise stop positions for conveyors and sorting robots.

Packaging Machinery: Enables high-speed, high-precision cutting and sealing of packaging materials.

4. Semiconductor & Electronics Manufacturing

Chip Mounting: Achieves nanometer-level positioning in wafer dicing and chip packaging.

Inspection Equipment: Drives high-precision displacement platforms for optical inspection.

5. Renewable Energy

Solar Panel Production: Powers laser scribing and lamination processes.

Battery Manufacturing: Controls tension and alignment in winding and stacking equipment.

Maintenance & Troubleshooting

Common Issues & Solutions

• Motor Vibration:

  • Check if encoder cables are separated from power lines to avoid EMI.

  • Re-plug connectors and tighten cables; replace encoder module if necessary.

• Overheat Alarm:

  • Adjust load to ≤80% of rated capacity.

  • Clean cooling vents to ensure airflow.

• Brake Failure:

  • Monthly test brake responsiveness; verify DC24V supply stability.

Routine Maintenance

1. Cleaning & Inspection: Daily removal of surface oil; check cable aging.

2. Parameter Calibration: Quarterly adjust gain parameters via servo drive to compensate for mechanical wear.

3. Firmware Updates: Regularly download latest control programs from Mitsubishi’s website.

Market Advantages & Selection Guide

Competitive Edge

Brand Reputation: Mitsubishi Electric, a global automation leader, offers products with strict certifications (CCC, CE).

Cost-Effectiveness: Balances performance and price, with low long-term maintenance costs.

Compatibility: Supports SSCNETⅢ/H bus protocol, seamlessly integrating with Mitsubishi systems (e.g., Q-series PLC).

Selection Tips

Load Inertia Matching: Recommended load inertia ratio ≤25x to avoid vibration.

Gearbox Selection: Choose (e.g., 1/5, 1/20) based on torque and speed requirements.

Brake Requirement: For emergency stop scenarios (e.g., cranes), opt for HG-KR73BJ with electromagnetic brake.

The MITSUBISHI HG-KR73 servo motor stands out as a high-precision, high-dynamic-performance solution for industrial automation. Whether enhancing CNC machining accuracy or driving complex robotic movements, it delivers reliability and efficiency. For manufacturers pursuing smart production upgrades, the HG-KR73 is an ideal choice.