One New Mitsubishi Servo Motor HC-MFS23G1-UE HCMFS23G1UE New In Box Factory Sealed

Mitsubishi HC-MFS23G1-UE Servo Gearmotor — 200W Ultra-Low Inertia with Reduction Gearhead, EN/UL Compliant, New In Box Factory Sealed

When an application calls for precise low-speed positioning, controlled torque at reduced output speeds, or better inertia matching between a compact motor and a heavier load mechanism, attaching a reduction gearhead to the drive motor is the standard engineering response. The Mitsubishi HC-MFS23G1-UE delivers exactly this: a 200W ultra-low inertia MELSERVO J2S servo motor with an integrated G1 general industrial reduction gearhead, certified to both EN European Standard and UL/C-UL North American Standard, and supplied new in original factory-sealed packaging.

Two Components, One Factory-Integrated Unit

The HC-MFS23G1-UE is not a motor plus a separately mounted gearbox. It is an integrated gearmotor — the G1 reduction gear assembly is factory-fitted to the HC-MFS23 motor body at the time of manufacture, verified as a matched and aligned assembly, and shipped complete. The output interface, load ratings, and mechanical dimensions reflect the combined unit.

The HC-MFS23 base motor is the 200W member of Mitsubishi's HC-MFS ultra-low inertia family — a 60 × 60 mm frame motor rated at 0.64 Nm continuous torque and 3,000 rpm, built around a 17-bit absolute optical encoder delivering 131,072 positions per revolution. The G1 gearhead is Mitsubishi's general industrial reduction gear classification, designed for assembly machines, handling equipment, and industrial automation applications where moderate reduction ratios, compact installation, and reliable continuous duty are the primary requirements.

Technical Specifications

The Role of the G1 Reduction Gear

In Mitsubishi's HC-MFS servo gearmotor lineup, the G1 suffix designates the general industrial reduction gear — a spur-gear-type integrated gearhead engineered for the duty cycles and load characteristics typical of general factory automation. It fills the performance gap between the higher-precision (and more expensive) G5 and G7 spiral bevel gearheads and a bare motor connected to a customer-supplied gear train.

The gearhead multiplies the motor's output torque proportional to the reduction ratio, while reducing the output speed by the same factor. For a 200W motor delivering 0.64 Nm at 3,000 rpm, even a moderate reduction ratio produces a substantially higher torque at the gearhead output shaft — enough to drive loads that would be mechanically impractical to couple directly to the bare motor shaft.

Equally important is the effect on load inertia matching. The G1 gearhead reduces the reflected inertia of the load back to the motor by the square of the gear ratio. This allows the HC-MFS23's ultra-low inertia motor design to drive loads with significantly higher inertia than the motor alone could handle within its recommended inertia ratio — precisely the problem the G1 gearhead is engineered to solve.

17-Bit Absolute Encoder — Position Intelligence Built In

Position sensing in the HC-MFS23G1-UE comes from the same 17-bit absolute encoder that is standard throughout the HC-MFS series — 131,072 discrete positions per motor shaft revolution, transmitted via FANUC-compatible high-speed serial link to the servo amplifier.

The encoder reads the motor shaft position, not the gearhead output shaft. The servo system accounts for the gear ratio in the parameters, translating motor position data into accurate output shaft position across the full operating range. Being absolute, the encoder retains position data through power cycles with battery backup in the amplifier — eliminating homing routines at each machine startup.

EN and UL/C-UL Standard Compliance — The UE Designation

The -UE suffix is a Mitsubishi factory designation confirming that this unit has been manufactured and verified to comply with both:

EN Standard (European Norm) — the conformity framework required for CE-marked equipment sold and operated within the European Union and European Economic Area. Compliance covers electrical safety, motor construction, and electromagnetic compatibility as required by applicable EU directives.

UL/C-UL Standard — Underwriters Laboratories certification covering both US (UL) and Canadian (c-UL) market requirements. This is the recognized safety certification for electrical apparatus in North American industrial and commercial installations.

Per Mitsubishi's documentation, the handling, performance, and electrical specifications of the UE-compliant model are identical to the standard model. The UE designation reflects added manufacturing traceability, component compliance verification, and documentation — not a difference in motor design. For machine builders who supply equipment to multiple geographic markets, or who must demonstrate regulatory compliance to end customers, specifying the -UE variant provides the documentation trail the certification process requires.

Compatible Servo Amplifiers

The HC-MFS23G1-UE pairs with the MR-J2S-20A (analog/pulse-train command interface) or MR-J2S-20B (SSCNET network interface) servo amplifiers, both rated at 200W within the MELSERVO J2S platform.

For the amplifier parameter configuration, the gear ratio must be entered so the servo system correctly maps motor encoder counts to output shaft position. Mitsubishi's MR-J2S amplifiers provide dedicated parameter settings for electronic gear ratio, making this setup straightforward during commissioning.

Where This Motor Goes to Work

The HC-MFS23G1-UE combination — compact frame, ultra-low motor inertia, integrated reduction, certified standards compliance — fits a specific and well-defined set of automation applications:

Assembly machines — rotary indexing stations, part transfer mechanisms, and multi-axis assembly cells where the G1 gearhead provides the output torque needed to drive loaded fixtures and tooling at controlled, repeatable speeds

Packaging and labeling equipment — format adjustment axes, registration drives, and date-coding mechanisms where precise positioning at moderate speed is more important than raw velocity

Pick-and-place automation — linear and rotary transport axes where the gearhead reduces the effective load inertia, improving the system's dynamic response at the motor shaft

Medical device and laboratory automation — systems destined for European or North American markets where EN and UL/C-UL compliance is a procurement requirement, not an option

Semiconductor and electronics handling — wafer transport, component placement, and inspection station positioning axes where low inertia, position accuracy, and standards documentation all appear on the specification sheet

Vertical axes with controlled descent — the reduction gear provides inherent holding torque at standstill (against gravity loads) proportional to the gear ratio, reducing the reliance on motor holding current alone

HC-MFS23 Gearmotor Suffix Overview

The HC-MFS23 base motor is available with several gearhead and suffix configurations. The G1 and G2 designations represent different reduction ratios within the general industrial gearhead category; G5 and G7 are higher-precision configurations for more demanding angular accuracy requirements. The UE suffix applies across variants where standards-compliant certification is required. Confirm the exact suffix combination required by your application before ordering.

FAQ

Q1: What servo amplifier is compatible with the HC-MFS23G1-UE?

The correct amplifiers are the MR-J2S-20A (for analog speed/torque commands or pulse-train position commands from an external controller) or MR-J2S-20B (for SSCNET serial network systems with Mitsubishi motion controllers). Both are 200W-rated MELSERVO J2S amplifiers. The gear ratio must be programmed into the amplifier's electronic gear parameter during initial commissioning.

Q2: What does the G1 gearhead provide that the bare HC-MFS23 motor does not?

The G1 gearhead multiplies the motor's output torque in proportion to the gear ratio while reducing the output shaft speed by the same factor. It also reduces the reflected inertia of the load back to the motor by the square of the ratio, allowing the ultra-low inertia motor to drive loads with substantially higher inertia than would otherwise fall within the motor's acceptable inertia ratio. For applications needing low output speed, high output torque, or better inertia matching, the G1 gearhead provides all three in a single compact factory-assembled unit.

Q3: What is the difference between G1, G5, and G7 gearheads on the HC-MFS series?

G1 is Mitsubishi's general industrial reduction gear — spur gear type, suitable for typical automation and handling applications where moderate positional accuracy at the output shaft is acceptable. G5 and G7 are precision reduction gears (spiral bevel type) with tighter backlash tolerances, intended for applications requiring significantly higher angular positioning accuracy at the gearhead output, such as precision rotary tables and measurement equipment. The G1 is the appropriate choice for the majority of assembly and handling applications; G5/G7 are specified when the machine's accuracy requirement demands it.

Q4: What does the -UE suffix mean and is it required for my application?

-UE indicates the motor has been manufactured to comply with both EN European Standard (required for CE-marked equipment in Europe) and UL/C-UL Standard (required for North American market installations). The motor's electrical and mechanical performance is identical to the non-UE version; the difference is regulatory compliance documentation. If your machine will be CE-marked for the European market, or must meet UL requirements for a North American customer, the -UE variant is the correct specification. For internal use in non-regulated environments, both variants perform identically.

Q5: Does the 17-bit encoder read position at the motor shaft or at the gearhead output shaft?

The encoder reads the motor shaft directly. The servo amplifier uses the programmed electronic gear ratio to convert motor position counts into the corresponding output shaft position. This approach maintains the full 131,072 ppr resolution of the encoder while correctly representing the output shaft angle in the position feedback loop. The servo system handles the translation transparently — from the machine controller's perspective, position commands and feedback are always expressed in terms of the output shaft, regardless of the gear ratio in use.