Mitsubishi HC-SFS52 (HCSFS52) — 500W AC Servo Motor, Straight Shaft, No Brake, 2000 rpm, MELSERVO J2-Super Series

Product Overview

Part Number: HC-SFS52

Also Searched As: HCSFS52, HC SFS 52, HC-SFS-52

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

Classification: Medium-Inertia AC Brushless Servo Motor — 500 W, 200V class, 2000 rpm, Straight Shaft, No Brake

The Entry Point to the HC-SFS 2000 rpm Range

The Mitsubishi HC-SFS52 is where the HC-SFS 2000 rpm family starts. At 500W, it is the smallest and lowest-torque motor in this particular line — 2.39 Nm rated continuous torque and 7.16 Nm available on demand for acceleration — on the compact 130 × 130 mm flange with a straight shaft and no electromagnetic brake.

What it shares with every motor further up the HC-SFS 2000 rpm range is the J2-Super platform underneath: a 17-bit serial absolute encoder at 131,072 ppr, multi-turn absolute position maintained through power-off by the A6BAT battery in the MR-J2S-60 amplifier, and the complete suite of J2-Super servo functions including real-time auto-tuning, adaptive vibration suppression, and machine resonance suppression filter. Those are not features reserved for the larger motors in the family. The HC-SFS52 gets all of them.

What distinguishes it is the operating point — 500W, 2,000 rpm, 2.39 Nm continuous. That combination fits a well-defined category of machine axes, and fitting it well is what the HC-SFS52 does.

Technical Specifications

500W at 2000 rpm: What This Motor Is Actually For

Two point three nine Newton-metres continuous torque at 2,000 rpm. That is a modest output by the standards of the wider HC-SFS family — but modest capacity is exactly correct for the axes this motor serves.

Not every servo axis on a machine is a primary feed drive or a high-force structural mechanism. A substantial number are lighter-duty axes where the load is relatively small, the motion pattern is repetitive, and what matters most is precise position control, reliable cycle-after-cycle consistency, and a compact motor that does not dominate the machine structure. Auxiliary axes on CNC equipment. Secondary feed mechanisms on packaging and assembly lines. Tension control and dancer arm drives. Register control axes. Positioning stages carrying moderate payloads through short, frequent moves. These axes need a capable, well-specified servo motor — they do not need 5kW.

The HC-SFS52 provides genuine J2-Super servo platform performance at 500W: the same encoder resolution, the same amplifier platform quality, the same auto-tuning and vibration suppression features as the 5kW and 7kW motors in the family. The only things that are smaller are the motor body, the amplifier, and the torque.

The 7.16 Nm peak torque — three times the 2.39 Nm continuous rating — handles the acceleration transients on each positioning move. For a light-load axis making repeated short moves, this peak capacity is what keeps cycle times short. The axis accelerates hard to traverse speed, runs at or below rated torque, and decelerates hard, with the thermal budget remaining comfortable throughout because the peak phases are brief.

HC-SFS52 vs HC-SFS53: Choosing the Right Speed Point

The HC-SFS 500W family at J2-Super offers two operating points. The HC-SFS52 runs at 2,000 rpm with 2.39 Nm rated torque. The HC-SFS53 runs at 3,000 rpm with 1.59 Nm rated torque. Same 500W output, same 130 × 130 mm flange, same MR-J2S-60 amplifier class — different speed-torque balance.

The choice between them is an axis design question, not a quality question.

Choose the HC-SFS52 at 2,000 rpm when the axis is primarily torque-limited — when the sustained load torque approaches 1.5–2 Nm continuously and speed is not the binding constraint. Ball-screw axes with moderate loads at moderate traverse speeds. Conveyor sections running under sustained material load. Winding drives requiring constant tension across a significant roll diameter range. Mechanisms where the motor-to-load gear or belt ratio puts the working point near 2,000 rpm naturally.

Choose the HC-SFS53 at 3,000 rpm when the axis is primarily speed-limited — when the mechanism needs shaft speed and the load torque is comfortably within 1.59 Nm continuous. Light high-speed positioning axes. Direct ball-screw coupling at high linear traverse speeds. Applications substituting for stepper motors where the stepper ran at high step rates and shaft speed mattered more than torque headroom.

Both motors mount identically and use the same amplifier family. The torque-speed selection can often be revisited during commissioning by comparing actual operating torque demand against both ratings — but getting it right in the design phase avoids the motor swap entirely.

The Straight Shaft and No-Brake Configuration

The HC-SFS52 comes with a smooth straight shaft and no electromagnetic brake. At 500W on a 130 × 130 mm frame, these are the appropriate defaults for the applications this motor serves.

Straight shaft. At 2.39 Nm rated and 7.16 Nm peak, the torque transmission demands on the coupling interface are modest. Standard flexible servo couplings — jaw couplings, bellows couplings, disc couplings — clamp to the smooth shaft OD using a split hub or shrink fit and handle the torque range comfortably. The coupling selection should be sized to the peak torque value of 7.16 Nm, not just the rated torque. Even modest over-sizing relative to the peak figure is good practice.

For applications where the driven component has a keyway bore — a small gear, sprocket, or pulley — the HC-SFS52K (keyed shaft, no brake) carries an identical performance specification and uses the same MR-J2S-60 amplifier. The only difference is the machined keyway on the shaft.

No brake. Servo lock through the MR-J2S-60 amplifier holds position reliably on horizontal and symmetrically loaded axes. The 17-bit encoder monitors shaft angle at 131,072 counts per revolution; the amplifier supplies corrective current to maintain zero following error. At 500W on a horizontal axis, servo lock is entirely adequate and the absence of a brake means no 24V brake circuit, no relay, no MBR interlock, and no brake disc inspection on the maintenance schedule.

The boundary condition is the same as for any braked motor decision: if the axis carries a gravitational load that would cause movement when servo current drops to zero, a brake is required. For those applications — vertical axes, inclined feeds — the HC-SFS52B (straight shaft, spring-applied brake) is the correct specification. At 500W, vertical axes tend to carry light loads, and the combination of a modest payload and the spring-applied brake produces a mechanically safe and easily sequenced axis.

MR-J2S-60: The Amplifier Pairing

The HC-SFS52 pairs with the MR-J2S-60 amplifier family — the smallest capacity J2-Super platform at 600W rated output. Three interface variants:

MR-J2S-60A is the general-purpose analog and pulse-train interface amplifier. It accepts pulse-train position commands from CNC controllers and PLCs, plus analog speed and torque references. All control modes — position, speed, torque, and switched combinations P/S, S/T, T/P — are available. RS-232C connects to MR Configurator for commissioning and diagnostic monitoring. The standard choice for auxiliary axes on machine tools, standalone positioning drives, and any application where the command source is an external controller.

MR-J2S-60B connects to Mitsubishi A-series and Q-series motion controllers via SSCNET fiber-optic serial bus. All axis commands and encoder feedback travel over the fiber link. For multi-axis machines where the HC-SFS52 axis must coordinate with larger axes under a Mitsubishi motion controller — an auxiliary feed axis on a multi-axis machining centre, a secondary positioning axis on a coordinated transfer system — the SSCNET bus provides real-time axis coupling.

MR-J2S-60CP provides built-in single-axis positioning with up to 31 stored point-table positions, activated by digital I/O or CC-Link network command. For standalone indexed or point-to-point positioning axes that do not require coordination with other axes — register mark positioning on a web process machine, a simple indexed rotary feed, an auxiliary axis on packaging equipment — the CP eliminates the cost and complexity of a dedicated motion controller.

Compatibility notes. The HC-SFS52 requires an MR-J2S-60 amplifier. It is not compatible with the first-generation MR-J2-60 amplifier, which cannot decode the 17-bit J2-Super encoder serial protocol. For machines running original MR-J2-60 hardware, the HC-SF52 (same mechanical specification, 14-bit encoder) is the correct motor. Not compatible with MR-J3 or MR-J4 amplifiers without a renewal adapter kit.

The 17-Bit Encoder at 500W: Not an Afterthought

It would be easy to assume that the 17-bit absolute encoder is a feature that matters more on large, high-precision axes than on a compact 500W motor. That assumption is worth examining.

Resolution at low power. The 131,072 counts per revolution encoder on the HC-SFS52 provides exactly the same velocity feedback quality as on any other HC-SFS motor. On a 500W axis used for tension control, register positioning, or a light feed drive where smooth low-speed operation is important, the fine velocity feedback from the 17-bit encoder directly contributes to stable torque output and consistent position following. A coarser encoder at 500W would produce more velocity ripple, more torque variation, and worse positioning repeatability — particularly at low speeds where the encoder count rate is low and the difference between 16,384 and 131,072 counts per revolution is most noticeable.

Absolute position at 500W. The absolute position capability on a 500W axis matters for exactly the same operational reasons as on a 5kW axis. A register control axis on a packaging line that must resume exact position after a line stop does not benefit from homing. An auxiliary axis on a CNC machine that must return to a defined position after a tool change or E-stop should not require a reference-return movement to get there. The HC-SFS52's absolute encoder eliminates these homing requirements just as it does on larger motors.

Battery location and service. The A6BAT backup battery is in the MR-J2S-60 amplifier, not in the motor. Battery replacement is a panel-level task that requires no access to the motor. Replace it at the first low-battery alarm from the amplifier — a fully depleted battery resets the multi-turn counter and requires a reference-return cycle before the axis can resume production.

HC-SFS 2000 rpm Family — The 52 at the Bottom

The HC-SFS52 is the entry point of the HC-SFS 2000 rpm range. Together with the HC-SFS102 (1kW) and HC-SFS152 (1.5kW), it shares the compact 130 × 130 mm mounting flange. Above the 1.5kW level, the family steps up to the 176 × 176 mm frame at the HC-SFS202 — a mechanical change that means the three compact-frame models cannot be directly swapped for larger-frame motors without modifying the mounting interface.

Within each capacity step, every model is available in the four shaft-and-brake configurations: straight shaft (HC-SFS52), straight shaft with brake (HC-SFS52B), keyed shaft (HC-SFS52K), and keyed shaft with brake (HC-SFS52BK). All four use the MR-J2S-60 amplifier at this capacity.

Stepping up from the HC-SFS52 to the HC-SFS102 doubles the continuous torque from 2.39 Nm to 4.78 Nm — a meaningful increase for axes where the operating torque regularly approaches the HC-SFS52's continuous ceiling. The amplifier class changes from MR-J2S-60 to MR-J2S-100, but the 130 × 130 mm flange remains the same, so the motor mounting does not require modification.

Typical Applications

Auxiliary axes on CNC machining centres and turning centres. Tool magazine indexing drives, tailstock positioning axes, chuck jaw positioning actuators, and coolant nozzle positioning drives on CNC machine tools. These axes carry light loads, run infrequently relative to the primary feed axes, and need accurate position control rather than high sustained torque. The HC-SFS52 provides full J2-Super servo capability in a compact package appropriate to auxiliary axis service.

Register control and web tension axes on packaging and printing machines. Mark-registration positioning drives, dancer arm actuators, and tension roller drives on packaging lines, labelling machines, and printing presses. Web tension control requires precise torque modulation at low to moderate shaft speeds — the 2000 rpm rating and 17-bit encoder resolution suit these applications well.

Secondary feed axes on converting and slitting machines. Slitter knife positioning drives, rewind hub drives on small-format rewinders, and trim winder drives on converting lines where the driven load is light and the operating torque is well within the HC-SFS52's continuous rating.

Compact X-Y positioning stages and coordinate tables. Light-duty precision positioning stages on inspection equipment, laser marking systems, and small-format machining centres. At 500W with fine encoder resolution, the HC-SFS52 delivers the positioning accuracy these applications require without the motor mass and panel footprint of a larger capacity unit.

Indexed turret and tool changer drives. Rotary tool turret indexing drives, small automatic tool changer arm drives, and indexed magazine drives on compact CNC turning and machining centres. The combination of 2,000 rpm rated speed, 7.16 Nm peak for rapid index acceleration, and absolute encoder for immediate position knowledge on restart suits turret and ATC mechanisms well.

Frequently Asked Questions

Q1: What is the difference between the HC-SFS52 and the HC-SF52?

Both are 500W, 2000 rpm, straight-shaft motors on a 130 × 130 mm flange with identical mechanical dimensions and IP65 protection. The difference is the encoder generation. The HC-SF52 uses a 14-bit encoder (16,384 ppr) and is compatible with both first-generation MR-J2-60 and J2-Super MR-J2S-60 amplifiers. The HC-SFS52 uses a 17-bit encoder (131,072 ppr) and requires an MR-J2S-60 amplifier only. For machines already running MR-J2S-60 amplifiers, the HC-SFS52 offers eight times higher encoder resolution and improved low-speed performance. For machines on original MR-J2-60 hardware, the HC-SF52 is the compatible motor.

Q2: The HC-SFS52 uses the MR-J2S-60 amplifier. Can it be used with the MR-J2S-100 or MR-J2S-200 instead?

No — the motor and amplifier must be matched to the correct capacity class. The MR-J2S-60 is the correct amplifier for the HC-SFS52 at 500W 2000rpm. Using a larger amplifier class does not improve performance; Mitsubishi's compatibility tables specify the MR-J2S-60 for this motor. Conversely, the HC-SFS52 also cannot be used with a smaller amplifier — there is no smaller standard J2-Super amplifier below the MR-J2S-60. The correct pairing is MR-J2S-60 for all HC-SFS52 variants regardless of shaft or brake configuration.

Q3: How does the HC-SFS52 compare to the HC-SFS53 (3000 rpm) for the same application?

Both are 500W J2-Super motors on a 130 × 130 mm flange using the MR-J2S-60 amplifier, but they offer different speed-torque profiles. The HC-SFS52 at 2000 rpm provides 2.39 Nm continuous — more torque, less shaft speed. The HC-SFS53 at 3000 rpm provides 1.59 Nm continuous — less torque, more shaft speed. If your axis needs sustained torque above about 1.5 Nm and speed is secondary, the HC-SFS52 is the better choice. If the axis is speed-critical and load torque is consistently light, the HC-SFS53 is preferable. Both motors are mechanically and electrically interchangeable on the same mounting and amplifier.

Q4: Where is the absolute encoder backup battery located?

The Mitsubishi A6BAT lithium cell is inside the MR-J2S-60 servo amplifier, not in the motor. It maintains the multi-turn absolute counter through all power-off periods, allowing the axis to report its exact position immediately on restart without any homing movement. Replace it when the amplifier triggers a low-battery alarm. A fully depleted battery resets the multi-turn counter, and a reference-return cycle is required before the axis can resume production. Replacing the battery at the first alarm — rather than deferring — prevents this from becoming an unplanned production interruption.

Q5: The HC-SFS52 is discontinued. Is it still available, and what is the upgrade path?

The HC-SFS52 remains available through industrial automation surplus dealers and Mitsubishi servo specialist suppliers as new old stock and tested refurbished units — a practical sourcing path for machines committed to the J2-Super platform. For new machine designs or full platform upgrades, the current-generation equivalent is the HG-KR053 or HG-KR13 (MR-J4 series, 500W or 1kW, 3000 rpm, 22-bit encoder, IP67, 60 × 60 mm or 80 × 80 mm flange depending on model) paired with an MR-J4-60 or MR-J4-100 amplifier. Note that the flange dimensions on current-generation 500W motors differ from the HC-SFS52's 130 × 130 mm footprint, so mechanical adaptation is needed when upgrading to current hardware.