The HG-SR13 is Mitsubishi Electric’s 100 W low-inertia medium-capacity servo motor from the HG-SR series for the MELSERVO-J4 and MELSERVO-J3 servo amplifier platforms, providing 0.318 N·m rated torque at 3,000 rpm with a 22-bit multi-turn absolute encoder as standard — the entry-level model in the HG-SR series, designed for precision positioning axes in multi-axis machine tool systems, electronic assembly equipment, and inspection automation where compact motor frame size, low rotor inertia, and absolute position capability are required at 100 W continuous power. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the HG-SR13?
The HG-SR13 is a Mitsubishi Electric MELSERVO HG-SR series servo motor providing 100 W (0.1 kW) continuous rated output at 3,000 rpm rated speed, with a peak torque of 0.955 N·m (3× rated torque). The «SR» designation identifies the low-inertia medium-capacity motor family within the MELSERVO-J4 compatible motor range — «S» denoting the medium-capacity (standard inertia) classification and «R» indicating the rectangular flange mounting configuration. The «13» in the model designation denotes the 100 W, 3,000 rpm combination within the HG-SR series, consistent with Mitsubishi’s motor model numbering convention where the first digit indicates the frame size and the second digit indicates the rated speed class. The HG-SR13 is equipped with a 22-bit multi-turn absolute encoder as standard, providing 262,144 pulses per revolution position resolution and absolute position retention across power cycles when connected to an MR-J4-B or MR-J4-A series servo amplifier with the MR-BAT6V1SET encoder battery. The motor is compatible with MR-J4-10A/B (100 W amplifier) and MR-J3-10B/10A in J4 motor compatibility mode for retrofit applications.
Key Technical Specifications
- Model: HG-SR13
- Rated Output Power: 100 W (0.1 kW)
- Rated Torque: 0.318 N·m
- Rated Speed: 3,000 rpm
- Maximum Speed: 6,000 rpm
- Peak Torque: 0.955 N·m (3× rated)
- Rotor Inertia: 0.0283 × 10⁻⁴ kg·m²
- Encoder: 22-bit multi-turn absolute (262,144 pulses/rev)
- Power Supply Voltage: 200 VAC (via compatible servo amplifier)
- Insulation Class: F (155°C maximum winding temperature)
- Protection Rating: IP65 (shaft seal and connector side)
- Mounting: Square flange, IEC standard
- Operating Temperature: 0°C to 40°C (ambient)
- Weight: Approx. 0.55 kg
Compatibility & System Integration
The HG-SR13 is compatible with Mitsubishi MELSERVO-J4 amplifiers in the 100 W class — specifically the MR-J4-10A (pulse train input) and MR-J4-10B (SSCNET III/H network) — providing the standard motor-amplifier pairing for 100 W axes in new J4 servo system designs. For existing MELSERVO-J3 installations, the HG-SR13 is compatible with the MR-J3-10A and MR-J3-10B amplifiers in J4 motor compatibility mode (parameter PA22 = 1 in the J3 amplifier), enabling motor-only upgrade from legacy HC-KFS13 motors to the current-generation 22-bit absolute encoder HG-SR13 while retaining the J3 amplifier. The HG-SR13’s 22-bit absolute encoder communicates with the servo amplifier via Mitsubishi’s proprietary serial encoder interface — the encoder cable (MR-J3ENCBL□M-A1-L or MR-J3ENCBL□M-A2-L depending on cable length and shielding requirements) connects the motor’s CN2 encoder connector to the amplifier’s CN2 port. The HG-SR13 power cable connects via the motor’s power connector (4-pin MS series on small-frame motors) to the amplifier’s CN2 motor output. For multi-axis SSCNET III/H systems, the HG-SR13 is managed by the motion controller (Q172DSCPU, RD77MS, FX3U-20SSC-H) as one axis among others in the servo chain, with the amplifier’s axis parameters (motor code, encoder type, inertia ratio) set to match the HG-SR13 specifications in MR Configurator2.
Installation Advice
When installing the HG-SR13 in a machine axis, verify that the shaft coupling or load connection method is compatible with the HG-SR13’s shaft dimensions (6 mm diameter, key-way specification in the hardware manual) and the maximum allowable shaft radial and axial loads. The HG-SR13’s low rotor inertia (0.0283 × 10⁻⁴ kg·m²) means that even a small mechanical load inertia dominates the total system inertia — calculate the load-to-motor inertia ratio before commissioning and verify it is within the MR-J4-10A/B’s recommended range (typically 30:1 maximum for standard applications). A high inertia ratio on a small 100 W motor causes the auto-tuning algorithm to set conservative gains that may result in poor positioning accuracy — if the load inertia ratio exceeds 20:1, manually specify the inertia ratio in MR Configurator2 (parameter PB06) rather than relying on auto-tuning to identify it correctly at low torque levels. The HG-SR13’s IP65 protection rating covers the motor body and shaft seal but not the encoder cable connector — in installations where the motor is exposed to water spray or coolant mist, use an IP67 connector boot over the encoder cable connector to prevent moisture ingress at the connection point. Route the motor encoder cable away from the motor power cable using separate cable trays or conduits — encoder cable and power cable proximity causes electromagnetic interference on the encoder signal at the 262,144 pulse/rev resolution that can manifest as intermittent position errors or AL.16 encoder alarms at high motor speeds.
Frequently Asked Questions
Q: Can the HG-SR13 be used with a brake option for vertical axis applications?
A: The HG-SR13 is available in a motor brake variant — the HG-SR13B (with electromagnetic holding brake). The brake is a spring-applied, power-released type providing holding torque when the power supply to the brake is removed (fail-safe brake design). The HG-SR13B’s brake holding torque is specified in the HG-SR series hardware manual — verify that the brake holding torque exceeds the static torque of the vertical axis load before specifying the brake variant. For the brake power supply, a dedicated 24 VDC supply separate from the encoder supply is required — do not share the servo amplifier’s 24 VDC sensor supply with the motor brake coil supply.
Q: What is the HG-SR13’s rated shaft radial load capacity, and does it support direct belt drive connection?
A: The HG-SR13’s allowable radial load at the shaft end is specified in the HG-SR series hardware manual (typically 78 N for the 100 W frame at the rated speed and load position). For belt drive applications, the belt tension creates a radial load that must be verified against this limit — excessive belt tension accelerating bearing wear is a common cause of premature servo motor failure in belt-driven axis applications. Measure the actual belt tension with a tension gauge and compare against the HG-SR13’s allowable radial load specification, adjusting belt tension to the minimum required for adequate power transmission without slippage.
Q: Is the HG-SR13 backward compatible with MR-J2S series amplifiers?
A: No. The HG-SR13’s 22-bit absolute encoder uses the MR-J4/J3 era serial encoder protocol, which is not readable by MR-J2S amplifiers. The MR-J2S amplifiers use a J2S-specific encoder protocol compatible only with HC-KFS and HC-MFS series motors. Replacing an HC-KFS13 motor with an HG-SR13 in an MR-J2S system is not possible without also replacing the amplifier with an MR-J4 or MR-J3 generation unit.
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