Mitsubishi HG-SN102BJ-S100 AC Servo Motor
MELSERVO JE 1kW Brake Motor with 17-Bit Encoder - New Factory Sealed
When 1kW Needs to Do More Than Just Spin
Not every 1kW servo motor is the same. The Mitsubishi HG-SN102BJ-S100 is the brake variant of the HG-SN 102 series, designed specifically for axes where gravity, spring load, or external forces make uncontrolled movement a problem when the drive is off or in a fault state.
Part of Mitsubishi's MELSERVO JE series and the HG-SN motor family, this motor delivers:
- 1 kW rated output at 2,000 RPM
- 4.77 Nm rated torque
- 3,000 RPM maximum speed
- 200V AC class supply with 5.6A rated current
- 17-bit absolute encoder (131,072 ppr)
- Integrated electromagnetic holding brake
- Oil seal at shaft exit
- IP67 protection across motor body
The S100 suffix identifies this as a special variant optimized for use with Mitsubishi's Super MR-E series amplifiers.
Technical Specifications
| Parameter |
Value |
| Part Number |
HG-SN102BJ-S100 |
| Series |
MELSERVO JE - HG-SN |
| Rated Output |
1,000W (1.0 kW) |
| Rated Torque |
4.77 Nm |
| Rated Speed |
2,000 RPM |
| Maximum Speed |
3,000 RPM |
| Rated Current |
5.6 A |
| Supply Voltage |
200V AC class |
| Encoder |
17-bit absolute (131,072 ppr) |
| Electromagnetic Brake |
Yes (built-in) |
| Oil Seal |
Yes |
| Flange Size |
130 × 130 mm |
| Shaft Type |
Straight |
| Cooling Method |
Natural convection (TENC) |
| Inertia Class |
Medium inertia / medium capacity |
| Protection Rating |
IP67 |
| Ambient Temperature |
0 to +40°C |
| Compatible Amplifiers |
MR-JE series / Super MR-E (S100) |
| Structure |
Totally Enclosed Natural Cooling (TENC) |
The Brake - How It Works and Why It Matters
The BJ designation confirms the integrated electromagnetic holding brake. Like all Mitsubishi holding brakes in this series, it is spring-engaged and power-released: apply the brake release voltage and the motor shaft turns freely; cut that voltage and the spring immediately clamps the brake disc, locking the shaft in place. This behavior is fail-safe by design - a power failure or emergency stop locks the axis automatically without any active control response required.
What this means practically: vertical axes holding a load, robot joints that must maintain position under gravity, and inclined conveyor drives all need exactly this characteristic. Without a brake, any of these applications would require external mechanical provisions to prevent uncontrolled movement when the servo goes offline.
The HG-SN102BJ-S100 eliminates that external provision by integrating it into the motor housing. The brake is a holding brake - it is not designed for dynamic stopping from speed. Using it to decelerate a running motor would cause rapid wear. The servo amplifier handles dynamic deceleration; the brake handles position holding at rest.
17-Bit Absolute Encoder and the S100 Designation
The 17-bit absolute encoder retains position data through power cycles when the amplifier is fitted with an appropriate backup battery. On startup, the system knows where the axis is without requiring a homing operation - a significant cycle time benefit on machines where homing is slow or mechanically constrained.
The S100 suffix identifies this motor as a special variant configured for Super MR-E series amplifiers. The encoder signal interface and parameter set are tailored for that amplifier generation. If you are evaluating this motor for a system running standard MR-JE amplifiers (without the S100 interface requirement), verify compatibility before specifying - the standard HG-SN102BJ variant may be the appropriate choice instead.
Natural Cooling - What TENC Means in Installation
The Totally Enclosed Natural Cooling (TENC) structure means the motor relies on convective heat transfer from its outer surface to the surrounding air and its mounting flange. There is no cooling fan to maintain or fail. For IP67 protection, the sealed construction is what makes waterproofing possible - an open motor with forced air cooling cannot achieve the same ingress protection.
Installation on a properly sized aluminum mounting flange is important for rated continuous operation. Mitsubishi specifies a 130 × 130 mm minimum flange size for the HG-SN 1kW class - the flange acts as a supplementary heatsink, and undersizing it reduces the motor's effective continuous torque rating in practice.
Application Fit
The HG-SN102BJ-S100 is well-suited for:
- Vertical CNC axes and Z-drives - where the brake holds the tool or spindle head on power-off
- Industrial robot joint drives - elbow and shoulder joints where gravity acts continuously
- Rotary indexing tables - where the brake holds index position between machining operations
- Winding and tension axes - where uncontrolled movement on e-stop could damage material
- General automation with vertical loading - any actuator where gravity creates a fall risk on de-energization
Frequently Asked Questions
Q1: What is the difference between the HG-SN102BJ-S100 and the standard HG-SN102J?
A: The BJ in the part number indicates the integrated electromagnetic brake - the standard HG-SN102J has no brake. The S100 suffix means this variant is configured for Super MR-E series amplifiers. For standard MR-JE amplifier systems, the HG-SN102BJ (without S100) is the typical brake-equipped variant.
Q2: Is the 17-bit absolute encoder battery-backed?
A: The encoder supports absolute position detection, but battery backup is provided at the amplifier side, not within the motor. The MR-JE series amplifier accepts a battery unit that maintains encoder position data through power cycles. Without the battery, the system operates in incremental mode and requires homing on startup.
Q3: What brake release voltage does this motor require?
A: Mitsubishi HG-SN series holding brakes typically require 24V DC for brake release. Confirm the brake voltage specification from the motor datasheet or nameplate - the amplifier's brake output or an external 24V supply circuit must be wired to the brake connector.
Q4: Can this motor be used horizontally, or is it only for vertical axes?
A: The motor can be mounted in any orientation - horizontal, vertical shaft-up, or vertical shaft-down. The oil seal protects against lubricant ingress and coolant splash regardless of mounting position. The brake is most functionally necessary on vertical and inclined axes, but the motor is mechanically suitable for horizontal use as well.
Q5: What amplifier is required for the HG-SN102BJ-S100?
A: The S100 variant is specifically configured for Mitsubishi Super MR-E series amplifiers. Confirm the amplifier model supports the S100 motor interface before installation. For standard MR-JE systems, the non-S100 variant HG-SN102BJ is the correct motor selection.
![HG-SN102BJ-S100 Mitsubishi AC Servo Motor HGSN102BJS100 New
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The Mitsubishi HG-SN102BJ-S100 is an OEM servo motor. Confirm amplifier compatibility, brake voltage supply, and encoder battery requirements against your system documentation before installation.
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