Mitsubishi Electric HG-SR301BJK HG-SR Series Rotary Servo Motor

Description

Executing high-performance industrial motion control requires high-accuracy equipment, and the Mitsubishi Electric HG-SR301BJK delivers this as a medium-inertia rotary servo motor optimized for the MELSERVO-J4 and MELSERVO-JE drive ecosystems. Engineered specifically with a 3.0 kW rated output and an integrated electromagnetic brake, this motor provides reliable holding torque and positional locking under heavy load states. This model features a specialized physical layout, including a keyway shaft and a built-in oil seal, allowing seamless integration into challenging mechanical setups where fluid or particulate contamination is a risk factor.

Features

• Medium Inertia Rotor: Delivers high-capacity acceleration-to-deceleration ratios, ideal for high-duty cycle industrial mechanisms.
• Electromagnetic Holding Brake: Built-in safety system designed to lock physical axis positions securely during power-loss or system shutdown.
• Enhanced Environment Protection: Equipped with an integrated oil seal and a keyed shaft output for highly reliable torque transmission under hostile mechanical conditions.
• High Resolution Encoder: Absolute encoder capability ensures precise positioning feedback back to the parent servo amplifier.

Applications

• Material Handling Systems: Driving vertical lift axes and heavy-duty gantry transfer systems requiring fail-safe holding capabilities.
• CNC Machining & Tooling: Powering auxiliary rotating tables and tool changers with demanding load characteristics.
• Stamping and Packaging Machinery: Controlling high-speed, intermittent load profiles while maintaining rigid path accuracy.

Technical Specifications

Wiring Connections & Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

This unit directly replaces older generation HC-SFS series equivalent units, though physical dimensions and cabling pinouts differ. You must use MR-J4 series compatible cables to interface the encoder. It is ideally paired with the MR-J4-350A or MR-J4-350B servo amplifiers. Utilizing a drive rated lower than 3.5 kW will restrict performance and result in current-limit faults during peak acceleration phases.

Application Pitfalls & Engineering Notes

Due to the presence of the integrated oil seal, do not operate the motor shaft without lubricant present at the seal lip. Running the oil seal dry can cause friction-induced thermal degradation of the seal material, leading to premature ingress failure. In vertical installations, ensure the brake is not being utilized to decelerate dynamic loads; the holding brake must only activate once the rotor has reached zero speed to prevent irreversible mechanical wear on the internal friction pads.

Commissioning & Wiring Tips

When routing cables, ensure the motor encoder feedback cable is physically segregated from the primary U/V/W motor power cable. Maintain a minimum separation distance of 100 mm inside cable carriers to prevent electromagnetic interference from triggering encoder communication faults. Utilize a surge absorber (diode) across the B1-B2 control relay contact to prevent transient voltage spikes from damaging adjacent control-system outputs.

Installation Guidelines