Mitsubishi HG-KR73 MELSERVO-J4 750W AC Servo Motor

Mitsubishi Electric MELSERVO-J4 HG-KR73 is an ultra‑low‑inertia, small‑capacity AC servo motor for high‑speed, high‑cycle precision positioning applications. 750 W (0.75 kW) continuous rated output at 3,000 rpm rated speed, with maximum speed 6,000 rpm. Built‑in 22‑bit absolute encoder (4,194,304 pulses/revolution). Straight shaft design. IP65 enclosure. 80 mm × 80 mm flange mounting. Natural cooling.

Applications:

• High‑speed pick‑and‑place machines and assembly automation

• Semiconductor manufacturing and electronic component handling

• Packaging machinery (form‑fill‑seal, labeling machines)

• CNC machine tools and precision machining

• SCARA robots, articulated robots and robotic arms

• Inspection and testing equipment

Core Specifications:

• Rated output power: 750 W (0.75 kW)

• Rated torque: 2.4 N·m

• Maximum torque: 8.4 N·m (instantaneous)

• Rated current: 4.8 A

• Maximum current: 17 A

• Rated rotational speed: 3,000 rpm

• Maximum rotational speed: 6,000 rpm

• Supply voltage: 200 V AC class (3‑phase, via servo amplifier)

• Rotor moment of inertia: 0.000137 kg·m² (1.37 kg·cm²)

• Encoder: 22‑bit absolute encoder (4,194,304 pulses/revolution)

• Shaft type: Straight shaft (without key)

• Flange mounting: 80 mm × 80 mm

• Connection: 4‑pin rectangular connector

• Protection rating: IP65 (excluding shaft‑through portion)

• Cooling method: Natural cooling (fanless)

• Insulation class: 130 (B) / Thermal class F

Advanced Specifications:

• Power rate at continuous rated torque: 45.2 kW/s

• Maximum radial load: 392 N

• Maximum axial load: 147 N

• Insulation resistance: ≥ 10 MΩ at 500 V DC

• Dielectric withstand voltage: 1,500 V AC for 1 minute

• Vibration level: V10

• Storage temperature: –15 °C … +70 °C

• Weight: approx. 2.8 kg

System Integration:

• This servo motor belongs to the Mitsubishi Electric MELSERVO‑J4 series HG‑KR family.

• Compatible servo amplifiers: MR‑J4‑70A (pulse train interface), MR‑J4‑70B (SSCNET III/H interface), MR‑J4‑70GF (fully closed loop), MR‑J4‑70A‑RJ, MR‑J4‑70B‑RJ. Multi‑axis amplifier compatible: MR‑J4W2‑1010B.

• In J3 motor compatibility mode (PA22 = 1), compatible with MR‑J3‑70A and MR‑J3‑70B amplifiers for motor‑only upgrades from legacy HC‑KFS73 motors.

• For absolute position retention during power‑off, install an MR‑BAT6V1SET battery backup unit.

• For detailed installation, wiring, and parameter setting, refer to the MELSERVO‑J4 Instruction Manual.

Related Products:

• Entry level (lower power, same frame) → HG‑KR23 (200 W, 80 mm flange)

• Current model → HG‑KR73 (750 W, ultra‑low inertia)

• Alternative inertia class (750 W, low inertia) → HG‑SR73 (higher inertia, better match for high‑inertia loads)

• Compatible servo amplifier (pulse train) → MR‑J4‑70A

• Compatible servo amplifier (SSCNET III/H) → MR‑J4‑70B

• Encoder cable (standard bending, motor shaft side) → MR‑J3ENCBL2M‑A1‑L (2 m) / MR‑J3ENCBL5M‑A1‑L (5 m) / MR‑J3ENCBL10M‑A1‑L (10 m)

• Encoder cable (standard bending, opposite side) → MR‑J3ENCBL1M‑A2‑L (1 m) / MR‑J3ENCBL2M‑A2‑L (2 m)

• Battery for absolute encoder → MR‑BAT6V1SET

• Power cable → MR‑PWS1CBL2M‑A1 (2 m, standard bending life)