One New Mitsubishi Servo Motor HC-SFS52BG1 HCSFS52BG1 Fast Delivery New Ann Original

Mitsubishi HC-SFS52BG1 Servo Motor — 500W | Electromagnetic Brake | G1 General Industrial Gearhead | 17-Bit Absolute Encoder | MELSERVO J2S

There is a broad class of industrial servo applications that sits between two extremes — too demanding for a bare motor, and too cost-sensitive or mechanically tolerant to justify a high-precision gearhead. Conveyor drives, palletizing axes, material transfer units, rotary dial plates with moderate index tolerances, horizontal ballscrews under significant friction loads. For these, what's needed is straightforward: gear reduction to multiply torque, a brake to hold position at rest, and absolute encoder feedback to eliminate homing. The Mitsubishi HC-SFS52BG1 covers all three in a single factory assembly — 500W medium-inertia HC-SFS motor, spring-applied electromagnetic brake, and G1 general industrial flange-output gearhead.

Specifications

The G1 General Industrial Gearhead — Right-Sized for the Application

Mitsubishi's HC-SFS gearhead lineup splits broadly into two categories: G1/G2 general industrial types and G1H/G2H high-precision types. The distinction isn't about quality — it's about what the application actually needs.

The G1 general industrial gearhead is built for the majority of servo-driven production equipment where torque multiplication and speed reduction are the primary requirements, and where angular positioning tolerances are measured in tenths of a degree rather than arc-minutes. Conveyors, material transfer arms, pallet drives, actuated fixtures, clamping mechanisms, rotary transfer stations in assembly lines — these all operate well within the G1's positioning capability while benefiting from its mechanical robustness and broad availability across gear ratio options.

Choosing G1 over G1H when G1 is sufficient for the application is the right engineering call. The high-precision gearhead's tighter manufacturing tolerances add cost and aren't recovered in applications where part drawings or process tolerances don't demand them. The HC-SFS52BG1 delivers the gear reduction and brake holding the application needs without the precision premium.

G1 is flange-output — the gearbox output stage presents a square mounting face for direct bolt-on installation to machine frames, rotary stage housings, or conveyor drive mounts. This flange-face interface locates the output shaft precisely relative to the machine structure without requiring secondary support legs or alignment fixtures.

Available gear ratios for the G1 gearhead on the HC-SFS52B platform include 1/5, 1/9, 1/12, 1/15, 1/20, and 1/25. Confirm the ratio from the original equipment documentation before ordering — the ratio is embedded in the specific assembly's configuration and must match the original installation.

Torque Multiplication: What Gear Reduction Actually Delivers

The HC-SFS52 motor rated torque of 2.39 Nm is its base capability at 2,000 rpm on the motor shaft. Add the G1 gearhead and the picture changes substantially.

At a 1/20 ratio, that 2.39 Nm becomes approximately 47.8 Nm continuous at the gearhead output shaft — from a 500W motor body in a 130mm flange. The motor still operates at its design point; the gearhead converts speed to force. Peak torque follows the same multiplication: the motor's 7.16 Nm maximum becomes roughly 143 Nm instantaneous peak at 1/20, providing substantial acceleration authority for inertia-matched loads during positioning moves.

This torque range covers a wide band of real industrial loads that would otherwise require a larger, heavier, and more expensive direct-drive servo. The HC-SFS52BG1 keeps the motor class compact and cost-effective while extending its effective working range into territory a bare 500W motor cannot reach.

Electromagnetic Brake: Spring-Engaged, Electrically Released

The B designation on the HC-SFS52BG1 means a spring-applied, power-off electromagnetic brake is integrated into the motor body between the stator housing and the gearhead assembly. The operating logic is simple and inherently safe:

Apply 24V DC to the brake coil → spring compresses → shaft turns freely → servo operates normally.

Remove voltage for any reason → spring re-engages → shaft locks mechanically.

The fail-safe nature of this design is why it's standard in vertical axis, inclined axis, and gravity-loaded applications. The shaft holds position by default. Holding requires no servo current, no controller activity, no amplifier power. A machine that loses power mid-cycle — whether from a planned shutdown, a tripped breaker, or an emergency stop — stays where it stopped.

With the G1 gearhead in the system, the brake holding torque at the output is also multiplied by the gear ratio, the same as driving torque. The brake doesn't just hold the motor shaft; it holds the gearbox output against the full reflected load that acts on it.

Electrical note: the brake coil requires a dedicated 24V DC power supply wired directly to the motor's brake connector — separate from the servo amplifier supply rails. The MR-J2S amplifier does not power the brake. This circuit must be designed into the machine electrical cabinet with appropriate contactor logic for controlled brake engagement and release timing.

17-Bit Absolute Encoder — The Homing Problem Solved

Every time a machine with incremental encoders powers up, it doesn't know where it is. Reference return — a careful, speed-limited homing sequence that drives each axis to a reference switch — must complete before production can begin. On a multi-axis machine, that routine can consume several minutes of production time per shift, per maintenance stop, per power cycle.

The HC-SFS52BG1's 17-bit absolute encoder eliminates this entirely. At 131,072 positions per motor shaft revolution across the full multi-turn range, with position data retained through power-off by the A6BAT backup battery in the servo amplifier, the machine knows its position the instant power is applied. Production starts immediately.

For machines using this motor on regularly serviced axes — where the brake is released manually during maintenance and the output shaft may be moved — the absolute position retention is equally valuable on the way back up, confirming the axis is at its known position before the first automated move.

Amplifier Pairing: MR-J2S-60A / MR-J2S-60B

The MR-J2S-60A and MR-J2S-60B are the correct servo amplifiers for the HC-SFS52 motor family within the MELSERVO J2S platform.

The MR-J2S-60A takes pulse-train commands (differential receiver up to 500 kpps, or open-collector up to 200 kpps) from PLCs, motion cards, or CNC controllers. Position, speed, and torque control modes are all available. The RS-232C/RS-422 interface supports MR Configurator setup software on Windows for parameter management, real-time monitoring, and auto-tuning.

The MR-J2S-60B connects to Mitsubishi's SSCNET serial network, pairing with motion controllers in multi-axis synchronized systems. SSCNET distributes position commands to all connected axes on a shared high-speed communication bus, enabling electronic gearing, interpolation, and coordinated multi-axis motion without axis-by-axis pulse-train wiring from the controller.

The motor, gearhead, and brake assembly is identical regardless of which amplifier is used. The amplifier choice is determined by the host controller type.

Applications

The HC-SFS52BG1's combination of features — gear-multiplied torque, fail-safe brake, absolute position feedback, and IP65 motor protection — suits a well-defined set of machines:

Automated pallet and workpiece transfer — horizontal servo-driven transfer axes where load mass requires gear-multiplied torque, and where the brake holds the transferred load at each station while work is performed. Absolute encoder means the machine is at position immediately at every startup.

Rotary dial and index table drives — stepping through a fixed number of stations in assembly or test equipment. G1 general industrial gearhead is well matched to index tolerances in the one-tenth of a degree range typical for assembly station spacing.

Vertical material lift and handling axes — the spring-applied brake prevents load drop at any power interruption; gear-multiplied torque handles the lifting force requirement; IP65 motor housing tolerates the environment.

Clamping and fixture actuating mechanisms — servo-driven clamps and vises benefit from gear torque multiplication for clamping force and the brake for holding without continuous servo current when clamped.

Conveyor and feed drive axes on packaging equipment — moderate-precision servo drives where cycle throughput and mechanical reliability over long production runs define value, and where the G1 general gearhead provides cost-effective torque multiplication without the high-precision gearhead specification premium.

HC-SFS52 Configuration Reference

All variants share the same 500W, 17-bit encoder, oil seal, IP65, 130×130mm platform. The HC-SFS52BG1 is the correct selection when electromagnetic brake and general-industrial-precision gearhead are both required, without the backlash-controlled G1H specification.

FAQ

Q1: What is the difference between the HC-SFS52BG1 and HC-SFS52BG1H?

Both are factory-assembled HC-SFS52 motors with electromagnetic brake and gearhead. The difference is gearhead precision: the G1 is the general industrial type suited for applications with standard positioning tolerance requirements; the G1H is the high-precision variant with tighter backlash control for applications where output shaft angular accuracy must be held to finer limits, such as precision index tables or tooling angle drives. If the application's positioning tolerances don't demand reduced backlash, the G1 is the appropriate — and more cost-effective — choice.

Q2: Which amplifier works with the HC-SFS52BG1, and does the amplifier power the brake?

The HC-SFS52BG1 is compatible with the MR-J2S-60A (analog/pulse-train interface) and MR-J2S-60B (SSCNET network interface). The electromagnetic brake requires a separate 24V DC power supply wired to the motor's brake connector — the servo amplifier does not supply brake coil power. This 24V circuit and its control logic must be incorporated separately into the machine electrical design.

Q3: What gear ratios are available for the HC-SFS52BG1?

The G1 gearhead for the HC-SFS52B motor is offered in ratios including 1/5, 1/9, 1/12, 1/15, 1/20, and 1/25. Each ratio is a distinct assembly configuration. When replacing an existing unit, always confirm the gear ratio from the original machine documentation or the gearhead nameplate — not the base part number alone. Fitting the wrong ratio will produce incorrect output speed and torque.

Q4: Does the 17-bit encoder need a battery, and what happens without it?

Yes. The absolute encoder retains multi-turn position data during power-off only when a Mitsubishi A6BAT lithium battery is installed in the servo amplifier's battery holder. With the battery installed and in service condition, position is preserved indefinitely through shutdowns. Without it, position data is lost the moment power is removed, and the axis must complete a reference return homing cycle before production can resume at the next startup.

Q5: What is the IP rating of the gearhead section versus the motor body?

The motor body is IP65 — completely sealed against dust, resistant to water jets from any direction. The gearhead section is IP44 — protected against solid particles over 1mm diameter and splashing water, but not sustained water jets or coolant flow. In machine tool environments where coolant spray reaches the gearhead housing, a protective deflector or shield should be included in the installation design.