June 05, 2026

UGFMED-C9SOD51 YASKAWA Minertia Coreless DC Servo Motor Specification

UGFMED-C9SOD51 belongs to Yaskawa classic Minertia cup coreless DC servo motor family, non-bare brake horizontal dedicated servo unit optimized for high-speed frequent start-stop precision automation equipment. The prefix C stands for non-brake structure without built-in 24VDC power-off electromagnetic holding brake, only applicable to horizontal installation axes free from load falling risk after power failure; coreless hollow cup rotor eliminates silicon steel lamination, featuring ultra-low inertia, zero cogging torque and ultra-smooth low-speed constant-speed operation; full natural convection cooling without external cooling fan. Digit 9 refers to unified frame size corresponding to 0.9kW rated power grade; suffix SOD51 is exclusive customized incremental encoder variant with dedicated pin assignment, unique rear connector definition, fixed outgoing cable specification and pulse resolution, fully different from MMG/EAP series encoder wiring standard, cannot cross replacement with other encoder suffix motors directly.

Description

UGFMED-C9SOD51 YASKAWA Minertia Coreless DC Servo Motor Specification

1. Product Overview

Model Code Definition

UGFMED: Base series code of Yaskawa Minertia coreless DC servo motor
C: Non-brake standard version (no internal power-off brake assembly)
9: Frame size code, fixed 0.9kW rated power specification
SOD: Custom incremental encoder exclusive specification group
51: Factory internal variant code for encoder resolution, cable length and connector pinout definition

2. Electrical Parameter Specifications

Rated armature input voltage is 144VDC, matched exclusively with Yaskawa legacy dedicated Minertia DC servo driver system. Continuous rated output power: 0.9kW; rated armature current: approx.7.2A; rated rotating speed:1750rpm under nominal working condition; instantaneous peak overload torque reaches 3.5 times continuous rated torque to satisfy instant heavy-load startup and abrupt acceleration demand.

No internal brake coil and corresponding 24VDC auxiliary brake power circuit, greatly simplifying field wiring layout. SOD51 differential line-drive incremental encoder follows proprietary factory pin definition, mismatched driver or connector wiring will lead to loss of position closed-loop feedback and abnormal motor runaway. Internal winding adopts Class F insulation standard, embedded built-in thermal detection component feeds overheat alarm signal to matched servo driver to trigger automatic stop for winding overheat protection; internal wiring cavity pre-installed surge suppression components to restrain field surge voltage and peripheral inverter EMI interference effectively.

3. Mechanical & Environmental Technical Data

Fully enclosed motor housing with IP54 protection rating against dust intrusion and splashing liquid erosion, full shell self-cooling without fan structure. Front output shaft is standard solid shaft with flat keyway for rigid connection with precision ball screw, timing wheel and miniature reducer. Due to no rear brake module layout, overall axial length is shorter than same frame B-type brake-equipped models, net weight approx.3.85kg, unified standard flange mounting dimension for direct equipment installation without transition fixture.

Allowable continuous operating ambient temperature: 0℃~+40℃; long-term storage temperature: -20℃~+70℃; working relative humidity:5%RH~80%RH non-condensing to avoid internal circuit dew short-circuit. For installation altitude over 1000m above sea level, rated load needs proper deration to offset degraded heat dissipation efficiency under thin air. It withstands standard industrial vibration of 10Hz~55Hz; installation environment with corrosive gas, continuous liquid splash and heavy conductive dust is forbidden to prolong bearing and winding service life.

4. Drive Matching & Control Mode Description

Original matching: Yaskawa old-generation dedicated Minertia DC servo amplifier, supporting two mainstream command input: ±10VDC analog speed instruction and differential pulse position instruction from upper PLC/CNC controller. The supporting servo system realizes seamless switching among position/speed/torque three closed-loop control modes to meet diversified process requirements.

Without built-in holding brake, vertical load equipment adopting this motor must configure independent external mechanical locking brake to prevent free falling after power cut. Equipped with incremental SOD51 encoder, full origin homing operation is mandatory after complete system power-off before formal startup to recover mechanical zero point for precision positioning.

5. Multi-layer Safety Protection & Fault Alert Mechanism

Cooperated with matched dedicated servo driver to realize full-range protection: winding over-temperature triggers automatic overload shutdown; SOD51 encoder cable open-circuit/poor contact outputs independent encoder fault alarm on driver panel; winding short-circuit and overcurrent activate driver hardware overcurrent protection with immediate main power cutoff. All encoder feedback circuits are equipped with filtering components to suppress complex field electromagnetic interference and stabilize position feedback signal transmission.

6. Regular Maintenance & Replacement Requirement

Field replacement requires original identical UGFMED-C9SOD51 spare motor; B-series brake type or other encoder suffix (MMG/EAP) motors cannot direct substitute unless complete connector rewiring and full servo parameter reset finished.

Before disassembly maintenance (bearing overhaul, encoder inspection), fully cut off 144VDC main power supply and wait more than 15 minutes for servo DC bus capacitance full discharge to eliminate residual high voltage and avoid electric shock hazard.

Periodic maintenance items: fasten rear connector fixing screws every 3 months; replenish high-temperature bearing grease after accumulative 8000 running hours; clean casing dust every 6 months to keep original heat dissipation capacity. Random modification on SOD51 encoder pin definition and internal wiring will cause motor out-of-control rotation and driver locking failure.

7. Typical Application Scope

Mainly applied to horizontal precision feed axis of small precision component automated assembly equipment, optical inspection testing machine micro drive unit, desktop precision micro-processing equipment feeding mechanism and compact automatic packaging equipment. Perfect fit for horizontal mounting working condition demanding high dynamic response, frequent start-stop and high repeat positioning accuracy without anti-drop brake requirement.

Contact Info