The HG-SR23 is Mitsubishi Electric’s 200 W low-inertia medium-capacity servo motor from the HG-SR series for the MELSERVO-J4 and MELSERVO-J3 servo amplifier platforms, providing 0.637 N·m rated torque at 3,000 rpm with a 22-bit multi-turn absolute encoder as standard — doubling the continuous output power of the HG-SR13 in the same motor series, designed for multi-axis machine tool feed axes, precision robotic wrist axes, and high-cycle packaging machine servo drives where 200 W of continuous servo power with high encoder resolution and absolute position capability is required. Atlantech Drives holds stock of the HG-SR23. Contact us for fast worldwide delivery and competitive pricing.
What Is the HG-SR23?
The HG-SR23 is a Mitsubishi Electric MELSERVO HG-SR series servo motor providing 200 W (0.2 kW) continuous rated output at 3,000 rpm rated speed, with a peak torque of 1.91 N·m (3× rated torque). Like the HG-SR13, the HG-SR23 is equipped with a standard 22-bit multi-turn absolute encoder (262,144 pulses/rev) and is compatible with MR-J4-20A (pulse train) and MR-J4-20B (SSCNET III/H) servo amplifiers. The «23» model designation indicates the 200 W power class at 3,000 rpm in the HG-SR numbering convention. The HG-SR23 has a larger frame than the HG-SR13, with correspondingly higher rotor inertia (0.0653 × 10⁻⁴ kg·m²) — still within the low-inertia classification of the HG-SR series, making the HG-SR23 responsive to rapid acceleration and deceleration commands compared to higher-inertia motor families. The motor is compatible with MR-J3-20A and MR-J3-20B amplifiers in J4 motor compatibility mode (PA22 = 1), enabling direct replacement of legacy HC-KFS23 or HC-MFS23 motors in existing J3-era servo systems while retaining the J3 amplifier infrastructure.
Key Technical Specifications
- Model: HG-SR23
- Rated Output Power: 200 W (0.2 kW)
- Rated Torque: 0.637 N·m
- Rated Speed: 3,000 rpm
- Maximum Speed: 6,000 rpm
- Peak Torque: 1.91 N·m (3× rated)
- Rotor Inertia: 0.0653 × 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. 0.85 kg
Series Comparison & Selection Guide
The HG-SR series covers the low-inertia medium-capacity motor range within Mitsubishi’s MELSERVO-J4 compatible motor family. The series spans from 100 W (HG-SR13) through 200 W (HG-SR23), 400 W (HG-SR43), 750 W (HG-SR73), 1 kW (HG-SR102/HG-SR1024), 2 kW (HG-SR202/HG-SR2024), 3.5 kW, 5 kW, and 7 kW models, all sharing the same 22-bit absolute encoder, IP65 protection, and J4/J3 amplifier compatibility. The HG-SR23 (200 W) is the correct motor selection when the axis continuous torque requirement at the rated speed falls between 0.318 N·m (HG-SR13 rated) and 0.637 N·m (HG-SR23 rated) at 3,000 rpm. For axes requiring the same torque at a different rated speed, the HG-SR2024 (200 W, 2,000 rpm) or HG-SR23 variants with different speed ratings may be available — consult Mitsubishi’s servo sizing tool for the optimal motor selection at the specific operating speed. Comparing HG-SR to HG-KR series: the HG-KR series provides ultra-low-inertia motors in smaller frame sizes for the same power class, with lower rotor inertia than HG-SR enabling faster acceleration response in high-cycle applications. For 200 W axes requiring the absolute minimum rotor inertia (high-speed indexing, rapid pick-and-place), the HG-KR23 provides lower inertia than the HG-SR23. For axes where moderate inertia and slightly larger shaft diameter are acceptable, the HG-SR23 provides higher peak torque capability and better load-side inertia matching in applications with moderate load inertia ratios.
Troubleshooting Guide
For HG-SR23 motors generating AL.16 (encoder error) alarms on the servo amplifier, the diagnostic sequence begins with the encoder cable — inspect the cable jacket for physical damage at both the motor connector and the amplifier connector, paying particular attention to the cable exit point from the motor body where mechanical stress concentrates during axis motion. Replace encoder cables showing any jacket cracking or conductor damage, even if the motor is still operating intermittently — a partially failed encoder cable can cause sudden axis runaway as the encoder feedback is momentarily lost at a high-speed position in the servo control loop. If the encoder cable appears intact, check the encoder cable connector at the motor for moisture ingress — the HG-SR23’s motor-side encoder connector is IP65 rated when the connector is fully mated, but partially mated or corroded connectors allow moisture to reach the connector pins. Clean connector pins with isopropyl alcohol if corrosion is visible. For HG-SR23 motors generating overtemperature warnings (the servo amplifier reports an overtemperature warning based on the motor’s thermal model) during normal operation within the rated continuous torque, verify the motor’s mounting surface is providing adequate thermal conduction — HG-SR23 motors rely partly on conduction through the mounting flange to the machine structure for heat dissipation. A mounting surface with poor thermal contact (air gap, paint between flange and mount, or undersized mounting structure) causes the motor temperature to rise above the thermal model’s expected value and trigger premature overtemperature warnings. Ensure the mounting flange is flat against a clean metal surface with adequate thermal mass.
Frequently Asked Questions
Q: Can the HG-SR23 replace the HC-KFS23 motor directly in an MR-J3-20A servo system?
A: Yes, provided the MR-J3-20A amplifier’s parameter PA22 is set to enable J4 motor compatibility mode. With PA22 = 1, the MR-J3-20A recognises the HG-SR23’s 22-bit encoder and operates with the motor — the position resolution increases from the J3-era 17-bit to the HG-SR23’s 22-bit, providing improved positioning accuracy. The encoder cable must also be replaced with an HG-SR-compatible encoder cable (MR-J3ENCBL series), as the HC-KFS23 encoder cable connector is physically incompatible with the HG-SR23’s encoder connector.
Q: What is the difference between the HG-SR23 and the HG-SR23B brake variant?
A: The HG-SR23B adds an electromagnetic holding brake to the HG-SR23 — the brake is spring-applied and power-released (24 VDC to release, spring force to engage), providing fail-safe holding for vertical axes when servo power is removed. The HG-SR23B’s overall motor length is longer than the HG-SR23 due to the brake assembly, and the motor weight increases by approximately 0.3 kg. The brake holding torque for the HG-SR23B is specified in the HG-SR series hardware manual and must be verified to exceed the gravitational holding torque of the vertical axis load.
Q: What is the HG-SR23’s IP rating, and is it suitable for use in food industry washdown environments?
A: The HG-SR23 carries IP65 protection — dust-tight and protected against water jets from any direction. IP65 is not suitable for submersion or high-pressure washdown — food industry washdown applications using high-pressure cleaning equipment (above 30 bar) require IP67 or higher protection. For food industry applications with high-pressure washdown requirements, Mitsubishi’s HG-SR series stainless steel shaft option or a dedicated washdown-rated motor with appropriate sealing must be specified.
Do you need more references from this brand? Explore our full catalog of Mitsubishi here: https://atlantechdrives.com/manufacturers/mitsubishi/
