The HG-MR13 is Mitsubishi Electric’s 100 W ultra-low-inertia small-capacity servo motor from the HG-MR 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 100 W model in the HG-MR ultra-low-inertia series, sharing the same power rating and rated torque as the HG-KR13 but with a different physical frame configuration for applications where the HG-MR mounting interface provides better mechanical compatibility with the machine structure. The HG-MR13 is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
What Is the HG-MR13?
The HG-MR13 is a Mitsubishi Electric MELSERVO HG-MR 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) and a 22-bit multi-turn absolute encoder providing 262,144 pulses per revolution. The «MR» series designation identifies the ultra-low-inertia small-capacity motor family with a specific physical frame configuration — distinct from the HG-KR series which provides the same power class in a different frame format. The HG-MR13’s rotor inertia (0.0283 × 10⁻⁴ kg·m²) is identical to the HG-KR13 at 100 W, making both motors equivalent in dynamic performance — the selection between HG-MR13 and HG-KR13 is based on physical mounting compatibility with the machine’s motor mount interface rather than performance difference. The HG-MR13 is compatible with MR-J4-10A (pulse train) and MR-J4-10B (SSCNET III/H) servo amplifiers as the standard 100 W motor pairing. In J3 motor compatibility mode (parameter PA22 = 1 on MR-J3-10A or MR-J3-10B), the HG-MR13 is compatible with MR-J3-10A and MR-J3-10B amplifiers — enabling motor-only upgrade from legacy HC-MFS13 motors in existing J3 servo systems while retaining the J3 amplifier.
Key Technical Specifications
- Model: HG-MR13
- 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 (ultra-low — identical to HG-KR13)
- 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: Specific HG-MR series frame configuration (verify against machine motor mount)
- Operating Temperature: 0°C to 40°C (ambient)
- Weight: Approx. 0.55 kg
Architecture & Design Overview
The HG-MR13 implements the same permanent magnet synchronous motor (PMSM) design as the HG-KR and HG-SR series — neodymium iron boron (NdFeB) rare-earth permanent magnets on the rotor providing high torque density in a compact frame, with the stator winding optimised for 3,000 rpm rated speed operation at 200 VAC supply via the MR-J4-10A/B amplifier. The 22-bit absolute encoder at the rear of the HG-MR13 communicates with the servo amplifier via Mitsubishi’s proprietary high-speed serial encoder interface, delivering 262,144 pulses per revolution position data to the amplifier’s position and speed loops at each servo control cycle. The ultra-low rotor inertia (0.0283 × 10⁻⁴ kg·m²) reflects the small rotor diameter and compact armature length of the 100 W motor frame — at this power level, the rotor’s physical mass is minimal, and virtually any mechanical load attached to the shaft will have a load-to-motor inertia ratio above 5:1. For HG-MR13 applications, careful servo gain setting is essential — the auto-tuning algorithm should be started at a low response level (3–4) and increased incrementally to avoid oscillation that the high inertia ratio makes more likely at high gain settings. The HG-MR13’s IP65 protection is achieved through the same combination of shaft seal and IP65-rated connectors as other HG-series motors — the IP65 rating applies only when the motor connector is fully mated with the encoder and power cables, and the locking mechanisms on both connectors are fully engaged. The motor frame’s mounting interface (flange dimensions, shaft diameter, shaft length, and keyway specification) is documented in the HG-MR series hardware manual — verify these dimensions against the machine’s motor mount drawing before ordering to confirm the HG-MR13 is the correct physical variant for the application versus the HG-KR13.
Compatibility & System Integration
The HG-MR13 is compatible with MR-J4-10A (pulse train) and MR-J4-10B (SSCNET III/H) servo amplifiers via the standard HG-MR-compatible encoder cable (MR-J3ENCBL series, A1 or B1 connector variant as appropriate for the HG-MR13 frame — verify in the HG-MR series hardware manual) and the MR-PWS1CBL motor power cable (appropriate length, A1 connector variant for the 100 W frame). In J4 motor compatibility mode (PA22 = 1), the HG-MR13 is also compatible with MR-J3-10A and MR-J3-10B amplifiers — providing the path for motor-only upgrade from HC-MFS13 motors in existing J3 servo systems, with the encoder cable replaced for the HG-MR’s different connector type. For multi-axis SSCNET III/H systems, the HG-MR13 paired with MR-J4-10B connects into the SSCNET III/H chain at the 100 W axis position, receiving position commands at the same 0.888 ms (or 0.444 ms) cycle as all other axes in the chain. The HG-MR13’s 22-bit absolute encoder, when paired with the MR-J4-10B in a SSCNET III/H system, enables the motion controller to know the axis position at power-up without homing — critical for safety-relevant machines where homing sequences create hazardous axis motion at power-up. Verify the HG-MR13 encoder connector type (A1 or B1) in the HG-MR series hardware manual before ordering the encoder cable — the 100 W HG-MR frame typically uses the A1 connector, but confirm against the hardware manual rather than assuming.
Frequently Asked Questions
Q: What is the physical difference between the HG-MR13 and the HG-KR13 at the same 100 W power rating?
A: The HG-MR13 and HG-KR13 provide identical electromagnetic performance — same rated torque (0.318 N·m), same rotor inertia (0.0283 × 10⁻⁴ kg·m²), same maximum speed (6,000 rpm), same 22-bit absolute encoder. The difference is the physical frame configuration: the mounting flange dimensions, shaft dimensions, and overall motor body shape differ between HG-MR and HG-KR series, making them mechanically non-interchangeable at the motor mount. Verify the required frame configuration against the machine motor mount drawing and the specific motor model’s hardware manual before selecting between HG-MR13 and HG-KR13.
Q: Can the HG-MR13 encoder cable (MR-J3ENCBL series) be the same as used for the HG-KR13?
A: The amplifier-side connector is the same for both HG-MR13 and HG-KR13 encoder cables (standard MR-J3/J4 CN2 20-pin MIL connector). The motor-side connector type (A1 or B1) depends on the specific motor frame — both HG-MR13 and HG-KR13 at 100 W typically use the A1 motor-side connector, making the encoder cable physically the same for both motors. Verify the specific connector type in each motor’s hardware manual before assuming the cable is interchangeable.
Q: Is the HG-MR13 available with an integrated holding brake for vertical axis applications?
A: The HG-MR series includes brake variants for motors requiring electromagnetic holding brake for vertical axis safety — the HG-MR13B (with brake) adds a spring-applied, power-released electromagnetic holding brake to the HG-MR13 motor body. The brake provides fail-safe holding torque when the 24 VDC brake power supply is removed (power-off or emergency stop), preventing the vertical axis load from descending under gravity. Verify the brake holding torque specification in the HG-MR series hardware manual against the gravitational load torque of the vertical axis before specifying the brake variant.
Do you need more references from this brand? Explore our full catalog of Mitsubishi here: https://atlantechdrives.com/manufacturers/mitsubishi/
