Mitsubishi HC-SFS52BG1-S13 — 500W AC Geared Servo Motor, Brake + G1 Reduction Gear, Special Specification, MELSERVO-J2S Series

Product Identification

Part Number: HC-SFS52BG1-S13

Also Searched As: HCSFS52BG1S13, HC-SFS52BG1S13

Series: Mitsubishi MELSERVO HC-SFS (J2-Super Generation)

Motor Type: AC Brushless Geared Servo Motor — Straight Shaft, Electromagnetic Brake, G1 Flange-Type Reduction Gear, Special Specification (-S13)

Understanding This Motor

The HC-SFS52BG1-S13 is a compact 500W geared servo motor from Mitsubishi's MELSERVO-J2S platform, built around three integrated components: a medium-inertia J2-Super servo motor, a G1 general industrial flange-type reduction gear unit, and a spring-applied electromagnetic brake. The -S13 suffix identifies this as a factory special specification variant — a configuration modified from the standard HC-SFS52BG1 for a specific OEM machine builder or application requirement. The special designation may relate to connector type, cable exit direction, or another physical modification; the core motor performance specifications remain identical to the standard model.

What the base hardware delivers is straightforward. At 500W and 2,000 rpm, the motor produces 2.39 Nm continuously at the motor shaft and 7.16 Nm at peak. After the G1 reduction gear, those figures transform into substantially higher output torque at proportionally lower shaft speed — a compact, self-contained drive solution that fits into machine envelopes where a full-size direct-drive servo motor combined with a separate external gearbox would not. The brake holds the output shaft mechanically the moment 24V DC is removed, making the assembly suitable for vertical, inclined, and any gravity-affected axis where servo lock alone is not an adequate safety measure.

When sourcing this part for a machine currently running the HC-SFS52BG1-S13, the -S13 designation matters. The correct replacement must match the special specification exactly — substituting a standard HC-SFS52BG1 may result in incompatible connectors, incorrect cable routing, or mounting interference depending on what the S13 variant modifies. Source the specific -S13 suffix.

Technical Specifications

The -S13 Special Specification

Mitsubishi uses the "-S" suffix followed by a number to designate factory-modified variants produced for specific OEM customers or particular machine applications. These modifications are applied at the factory during production and can involve connector orientation or type, cable exit direction, shaft end modifications, or other dimensional changes tailored to fit a specific machine's geometry or wiring harness design.

The -S13 variant of the HC-SFS52BG1 was produced for a particular machine builder's specification. Users searching for this part are almost always doing so because an existing machine requires an exact like-for-like replacement — and for those machines, the -S13 is the only fully interchangeable option. A standard HC-SFS52BG1 will have the same electrical performance and motor characteristics but may not physically interface correctly with the machine's wiring, mounting, or structural envelope.

If you are unsure whether the -S13 special specification applies to your machine, the motor's rating plate will confirm the full part number including the suffix.

G1 Gear Unit: Torque Multiplication for Compact Drives

The base HC-SFS52 motor delivers 2.39 Nm continuously — capable for many direct-drive applications, but limited in the torque-demanding, slow-speed scenarios that are common in general industrial automation. The G1 reduction gear changes that picture significantly. At a 1/20 ratio and typical gear efficiency of around 85–90%, the continuous output torque at the gear output shaft reaches approximately 40–43 Nm at 100 rpm. At a 1/9 ratio, it approaches 19–20 Nm at roughly 222 rpm. These are meaningfully different capabilities from the same base motor.

The gear unit is flange-type — it mounts axially against the motor's front flange and presents an output shaft at the far face of the gear housing. The assembly installs as a single unit, with the output shaft projecting forward in the same axial direction as the motor. This suits machine designs where the drive axis needs to enter a bore or mount against a face plate in the machine structure, and where the reduced output speed and multiplied torque suit the driven mechanism's actual requirements.

The motor shaft encoder reads at 131,072 ppr regardless of the gear ratio. Each output shaft revolution corresponds to multiple motor shaft revolutions, so effective encoder resolution at the output shaft is the motor resolution multiplied by the ratio — at 1/20, over 2.6 million effective counts per output shaft revolution. For slow-speed precision positioning, this is a very fine angular reference, far exceeding what a typical output-shaft encoder could deliver at this scale.

The gear section protection is IP44. This is lower than the motor body's IP65 rating, and it means directed water jets or continuous coolant exposure require supplemental sealing or a protective cover over the gear housing. For clean industrial environments, IP44 is adequate; for wash-down or heavy coolant environments, it must be evaluated against the installation's actual conditions.

Electromagnetic Brake: Fail-Safe Hold in a Small Package

At 500W, this motor is compact — but the gravity loads and mechanical risks on small axes are just as real as on large ones. A small conveyor ramp, a lightweight robot joint, a compact indexing station with a vertical dwell position — any of these can allow unexpected axis movement when servo current drops without a mechanical brake in the system.

The spring-applied brake on the HC-SFS52BG1-S13 sits on the motor shaft, between the encoder and the gear input stage. It engages when 24V DC is removed — default position is locked. Through the gear ratio, the effective holding force at the output shaft is the motor-shaft brake holding torque multiplied by the gear ratio. At 1/20, the mechanical hold at the output shaft is approximately 20 times the motor-shaft brake figure, providing a solid, reliable hold for any load within the axis's design capacity.

Correct commissioning practice applies: use the MR-J2S amplifier's MBR (brake interlock) output to sequence brake engagement after the amplifier has decelerated the motor to rest. Even at 500W, engaging the spring against a rotating shaft wears the brake disc surfaces prematurely. A surge absorber directly across the brake coil terminals is always required — the coil's inductive transient on switch-off damages relay contacts and output circuits without it.

17-Bit Encoder and Absolute Position

The J2-Super platform's 17-bit encoder at 131,072 ppr is one of its defining characteristics, and it applies fully to the HC-SFS52BG1-S13. The motor shaft encoder feeds position data to the MR-J2S amplifier at this resolution, which supports higher speed loop bandwidth and better velocity smoothness than the 14-bit device in the older HC-SF generation.

The absolute multi-turn counter retains position through power-off using the A6BAT lithium battery in the MR-J2S amplifier. On any power-up — after a planned shutdown, an e-stop recovery, or a power fault — the axis reads its absolute position immediately. No homing cycle. No reference return. For machines that undergo frequent stops and restarts, or that must recover quickly after unplanned stoppages, this has real production value.

Compatible Amplifiers

The HC-SFS52BG1-S13 pairs with the MR-J2S-60 class amplifier at 500W — one capacity step below the 750W MR-J2S-70. Three interface variants:

MR-J2S-60A accepts analog and pulse-train commands from CNCs and PLCs, with single-phase or 3-phase 200V AC input. Position, speed, and torque control modes.

MR-J2S-60B operates on SSCNET fiber-optic bus under Mitsubishi A-series or Q-series motion controllers for coordinated multi-axis applications.

MR-J2S-60CP has built-in positioning with a stored point table and CC-Link or I/O command interface for standalone operation.

All three support the 17-bit encoder protocol. Set electronic gear ratio parameters to match the installed reduction gear ratio before the first axis movement at commissioning.

HC-SFS 2000 rpm Family — 500W Position

The HC-SFS52 is the smallest capacity motor in the HC-SFS 2000 rpm range, sharing the 130 × 130 mm flange with the 102 and 152 models. All HC-SFS variants carry the 17-bit serial absolute encoder as standard, and all pair with MR-J2S amplifiers. The 500W/52 capacity point with G1 gear and brake is the appropriate specification for compact general industrial drives where the load torque requirement exceeds what direct coupling to a 500W motor can deliver.

Typical Applications

Small CNC machine auxiliary and indexing drives. Chip conveyor drives, small tool magazine indexing mechanisms, and coolant system servo drives on compact CNC machines use 500W geared servo motors with brakes in space-constrained installations. The compact 130 × 130 mm flange suits the limited available space in CNC auxiliary compartments, and the absolute encoder allows accurate positioning after any machine stop.

Compact rotary table drives. Small-format rotary index tables for assembly and inspection fixtures use 500W geared servo drives where the gear unit multiplies the motor's limited shaft torque into sufficient output for smooth, repeatable angular indexing. The brake holds each index position mechanically during the work dwell, reducing amplifier thermal load during high-duty applications.

Vertical transfer and lift axes on light handling systems. Lightweight vertical actuators on component transfer systems, PCB handling equipment, and small assembly robots use braked geared servo drives where the vertical load must be held securely between moves. The motor-shaft brake with gear-multiplied hold force provides reliable mechanical retention through every power-off event.

Packaging machine feed and dosing axes. Compact packaging and filling machine servo axes that run at low output shaft speeds with moderate torque loads use 500W geared motors where direct-drive cannot achieve the required output shaft speed/torque profile within the available motor size. The G1 gear unit provides the ratio, the brake holds position between fill cycles, and the absolute encoder maintains accurate product fill registration across every shift.

OEM machine replacement applications. Given the -S13 special specification, this motor is most commonly sourced as a direct replacement for an existing machine running the HC-SFS52BG1-S13. The part number's exact match — including the S13 suffix — ensures physical and electrical compatibility with the original machine design.

Frequently Asked Questions

Q1: What does the -S13 suffix mean, and does it change the motor's performance?

The -S13 designates a factory special specification — a variant of the standard HC-SFS52BG1 produced for a specific OEM customer or machine application. The modification may involve connector type, cable exit direction, or a physical change to suit a particular machine's interface requirements. Core motor performance specifications — output power, torque, encoder resolution, amplifier compatibility, and gear unit characteristics — are identical to the standard model. When sourcing a replacement for a machine running HC-SFS52BG1-S13, the -S13 suffix must match exactly.

Q2: Which amplifiers are compatible with the HC-SFS52BG1-S13?

The HC-SFS52BG1-S13 requires a MR-J2S-60 class amplifier. The three main variants are the MR-J2S-60A (analog/pulse command), MR-J2S-60B (SSCNET fiber-optic bus for motion controllers), and MR-J2S-60CP (built-in positioning). All support the 17-bit serial encoder. The motor is not compatible with MR-J3 or MR-J4 amplifiers. Always set the amplifier's electronic gear ratio parameters to match the actual reduction gear ratio installed before commissioning.

Q3: How does the G1 gear unit change the motor's output torque and speed?

The gear unit reduces output shaft speed and proportionally multiplies torque. At the motor's 2,000 rpm rated speed and 2.39 Nm continuous, a 1/20 gear ratio produces approximately 100 rpm output at roughly 40–43 Nm continuous torque (accounting for 85–90% gear efficiency). A 1/9 ratio gives approximately 222 rpm at around 19–20 Nm. The specific ratio installed is stamped on the gear housing nameplate. Confirm this value and enter it into the amplifier's electronic gear parameters before operating the axis.

Q4: Where is the encoder battery located, and how often should it be replaced?

The A6BAT lithium battery that maintains the 17-bit absolute encoder's multi-turn position counter is inside the MR-J2S servo amplifier — not in the motor or gear assembly. Replace it when the amplifier displays a low-battery alarm, before full depletion. A depleted battery causes the absolute position counter to reset, requiring a reference return cycle before the machine can resume production. Under typical operating conditions the battery lasts several years, but replacement interval depends on ambient temperature and power-off frequency.

Q5: Can the standard HC-SFS52BG1 substitute for the HC-SFS52BG1-S13?

In terms of electrical performance and motor output, the two are identical. However, the -S13 special specification indicates a physical modification — connector type, cable exit direction, or another dimensional change — that was designed for a specific machine. A standard HC-SFS52BG1 may not connect to the machine's wiring harness, may require cable routing adaptation, or may have dimensional interference at the mounting point. For safety and reliability, always source the -S13 variant for machines originally equipped with it. Consult the machine documentation or the motor's rating plate to confirm the required specification before ordering.