Product Overview
When you need precise motion control in a compact package, the Mitsubishi HG-MR73B rotary servo motor delivers. Part of the HG Series, this motor combines a rated output of 0.75 kW with an electromagnetic brake for reliable stopping and holding. Its ultra-low inertia design ensures rapid acceleration and deceleration, making it a strong choice for small-scale automation tasks.
Technical Specifications Breakdown
Let's examine the key parameters that define the HG-MR73B's performance:
- Rated Speed and Maximum Speed: The motor operates at a rated speed of 3000 r/min and can reach a maximum speed of 6000 r/min. This wide speed range allows it to adapt to varying operational demands, from steady-state positioning to high-speed cycles.
- Current Ratings: Under normal load, the motor draws a rated current of 5.8 Amps. It can handle peaks up to 20 Amps, giving you flexibility when dealing with momentary load spikes during acceleration or heavy cuts.
- Electromagnetic Brake: The built-in electromagnetic brake secures the motor shaft when power is removed. This feature is essential for vertical-axis applications or any setup where holding position without servo power is critical.
- IP65 Ingress Protection: With an IP65 rating, the HG-MR73B is protected against dust ingress and low-pressure water jets. You can install it in washdown environments or dusty factory floors without worrying about contamination.
- Ultra-Low Inertia and Small Power Capacity: The ultra-low inertia rotor minimizes mechanical time constants, enabling faster settling times. The small power capacity classification means this motor fits applications where space and energy efficiency are priorities.
Industry Applications
Consider the HG-MR73B for these real-world scenarios:
- Pick-and-Place Systems: The combination of 0.75 kW rated output and ultra-low inertia allows quick, accurate movements. The electromagnetic brake holds the load securely during power loss, preventing dropped parts.
- Packaging Machinery: In label applicators or small carton erectors, the IP65 rating protects against dust and occasional washdowns. The straight shaft simplifies coupling to pulleys or gears.
- CNC Router or Engraver: For small-format machines, the 200VAC supply voltage class and 5.8 A rated current integrate easily with standard servo drives. The maximum speed of 6000 r/min supports high-speed engraving passes.
Installation & Setup Guidance
When mounting the HG-MR73B, follow these practical tips:
- Shaft Alignment: The straight shaft requires precise alignment with the driven load. Use a flexible coupling to accommodate minor misalignment and reduce bearing stress.
- Brake Wiring: The electromagnetic brake requires a separate DC power supply. Verify polarity and voltage per the drive manual to ensure proper release and engagement.
- Cable Management: Route motor power and encoder cables separately from high-voltage lines to avoid noise coupling. Secure cables with strain relief to prevent pull-out during motion.
- Environmental Check: Although rated IP65, avoid submerging the motor or exposing it to continuous high-pressure spray. Ensure the shaft seal area remains clean.
Maintenance & Reliability
To maximize service life, adopt these routine practices:
- Inspect the Brake: Periodically test the electromagnetic brake by commanding a stop and verifying holding torque. Listen for unusual grinding or delayed release.
- Check Connections: At each preventive maintenance interval, tighten all power and signal connectors. Loose terminals can cause intermittent faults.
- Monitor Temperature: The motor's small power capacity means it can overheat if overloaded continuously. Use a thermal imaging camera to spot hot spots during peak operation.
- Keep It Clean: Wipe down the IP65-rated housing with a damp cloth to remove dust and cutting fluids. Avoid solvents that could damage the nameplate or seals.
Compatibility & Integration
The HG-MR73B integrates with Mitsubishi servo drives that support 200VAC class input and accept encoder feedback from HG Series motors. Common pairings include the MR-J4 series drives. Verify that the drive firmware matches the motor's encoder resolution and brake specifications. For new installations, consult the drive manual for parameter settings related to inertia ratio and current limits.
Selection Guide & Purchasing Advice
Before ordering the HG-MR73B, confirm these points:
- Load Inertia Ratio: The motor's ultra-low inertia works best when the load-to-motor inertia ratio is below 10:1. Calculate your system's reflected inertia to ensure stable control.
- Brake Holding Torque: The electromagnetic brake provides holding torque only, not dynamic braking. Do not use it to stop a moving load; decelerate with the drive first.
- Oil Seal: Note that this model does not include an oil seal. If your application involves gearboxes or belt drives that may leak lubricant, order a separate oil seal kit.
- Availability: Please verify current lifecycle status and availability with SpareTechPLC before ordering. Our team can confirm stock levels and lead times.
Frequently Asked Questions
Q1: What is the rated output of the HG-MR73B?
A1: The rated output is 0.75 kW, as specified in the technical data.
Q2: Does the HG-MR73B include an oil seal?
A2: No, the oil seal is not included. You may need to purchase one separately if your application requires it.
Q3: Can I use this motor in a washdown environment?
A3: Yes, the IP65 rating protects against dust and low-pressure water jets, making it suitable for many washdown areas.
Q4: What is the maximum current the motor can handle?
A4: The maximum current is 20 Amps, while the rated current is 5.8 Amps.
Q5: How does the electromagnetic brake work?
A5: The brake engages when power is removed, holding the shaft in position. It releases when DC voltage is applied, allowing free rotation.
