HC-KFS43 400W Low-Inertia AC Servo Motor 17-Bit Encoder | Mitsubishi

The Original New Mitsubishi HC-KFS43 is a 400 W (0.4 kW) low‑inertia AC brushless rotary servo motor from the MELSERVO J2S series, designed for high‑response precision motion control in industrial automation systems. Featuring a built‑in 17‑bit absolute feedback encoder (131,072 pulses/revolution) and a straight shaft design, it delivers accurate position feedback and reliable performance for applications requiring rapid acceleration and precise positioning. The motor is equipped with a 60 mm × 60 mm flange mounting interface and IP55 protection, making it suitable for machine tools, semiconductor manufacturing equipment, and general factory automation.

Core Engineering Highlights:
400 W (0.4 kW) rated output | 1.3 N·m rated torque / 3.8 N·m maximum torque | 3,000 rpm rated speed / 4,500 rpm maximum speed | 2.3 A rated current / 6.9 A maximum current | 17‑bit absolute encoder (131,072 ppr) | 0.0000460 kg·m² rotor inertia | 60 × 60 mm flange mounting | IP55 protection | 0°C to +40°C operating temperature

Key Features:

• Original New Mitsubishi HC-KFS43 servo motor

• 400 W (0.4 kW) rated output power

• 1.3 N·m rated torque, 3.8 N·m maximum torque

• 3,000 rpm rated speed, 4,500 rpm maximum speed

• 2.3 A rated current, 6.9 A maximum current

• Built-in 17-bit absolute encoder (131,072 pulses/revolution)

• Straight shaft design for secure coupling

• Low-inertia rotor (0.0000460 kg·m²) for rapid response

• 60 mm × 60 mm flange mounting

• IP55 protection against dust and water ingress

• Fan cooling for thermal management

• Compatible with MR-J2S series servo amplifiers

Applications:

• Precision positioning in semiconductor manufacturing equipment

• High-speed pick-and-place and assembly systems

• CNC machine tools and automated production lines

• Packaging machinery and labeling equipment

• General industrial automation requiring rapid acceleration and accurate positioning

• Material handling and conveyor systems

Technical Specifications:

System Compatibility:

• Compatible with Mitsubishi MELSERVO J2S series servo amplifiers including MR-J2S-40A (pulse train interface) and MR-J2S-40B (SSCNET interface)

• Also compatible with MR-J3-40A and MR-J3-40B amplifiers when configured for J2S compatibility mode

• For absolute position retention during power-off, an external battery (MR-BAT6V1SET) is required

• Suitable for use with HC-KFS series motor cables and encoder cables

Related Products:

• MR-J2S-40A – MELSERVO J2S series 400 W servo amplifier (pulse train interface)

• MR-J2S-40B – MELSERVO J2S series 400 W servo amplifier (SSCNET interface)

• HC-KFS43B – 400 W version with built-in electromagnetic brake

• HC-KFS43K – 400 W version with keyed shaft

• HC-KFS23 – 200 W version (lower power)

• HC-KFS73 – 750 W version (higher power)

• MR-BAT6V1SET – Battery for absolute encoder backup

• MR-J3ENCBL2M-A1 – Encoder cable, 2 m

• MR-PWS1CBL2M-A1 – Power cable, 2 m

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Mitsubishi and MELSERVO are trademarks of Mitsubishi Electric Corporation.