YASKAWA UGJMED-80LMU11 Minertia J-Series Coreless DC Servo Motor Specification

UGJMED-80LMU11 belongs to Yaskawa classic Minertia J-series coreless permanent magnet DC servo motor, designed for high dynamic precision motion control in industrial automation, precision testing equipment and automated assembly machinery. Adopting patented cup-type coreless rotor construction without silicon steel lamination, this unit eliminates inherent cogging torque of conventional iron-core motors and achieves ultra-smooth low-speed rotation with minimal speed fluctuation. The model is pre-equipped with built-in DC24V electromagnetic power-off holding brake for vertical load anti-fall protection under unexpected power interruption. LMU11 stands for factory-customized differential incremental encoder with exclusive pin definition and internal wiring layout; the overall design applies full-enclosed natural convection cooling without auxiliary cooling fan to simplify mechanical layout and reduce running noise, while the 80 marking corresponds to standard frame dimension and fixed power grade of 1800W rated output power.

UGJMED serves as base serial code for J-series coreless DC servo motor with integrated brake assembly; digit 80 indicates standardized frame size and 1.8kW power specification tier; LMU represents customized incremental encoder group with dedicated connector pinout differing from MMU, KMV and other standard encoder variants; the two-digit number 11 defines factory default outgoing cable specification, encoder resolution and internal terminal layout, without extra customized mechanical modification suffix for standard OEM configuration.

This servo motor operates under rated 112VDC armature input voltage and needs matching Yaskawa dedicated Minertia DC servo amplifier for closed-loop control system configuration. Continuous rated output power is 1800W, rated full-load armature current reaches roughly 13.2A at nominal working condition with standard rated speed set at 1000rpm continuous rotation. Instant peak overload torque can hit 3.2 times of rated torque to sustain frequent rapid acceleration, emergency deceleration and transient impact load in high-cycle production scenarios. The integrated brake coil requires independent 24VDC auxiliary power supply; brake releases output shaft when energized for normal motor operation and instantly locks drive shaft mechanically once auxiliary power is disconnected to fix suspended loads reliably. The equipped LMU11 line-drive incremental encoder follows proprietary factory wiring standard and cannot be directly replaced by other encoder type without connector rewiring and servo parameter reset. Internal stator winding complies with Class F insulation standard, embedded with thermal detection component to transmit overheat alarm signal to matched servo drive and trigger automatic shutdown to prevent winding burnout from over-temperature damage, and built-in surge absorption components suppress industrial on-site voltage spike and electromagnetic interference from peripheral inverter equipment.

Motor outer housing is constructed with IP54 ingress protection grade and fully depends on shell natural heat dissipation without external cooling fan structure. Front output shaft adopts solid round shaft with integrated flat keyway for rigid connection with precision ball screw, miniature reducer and timing pulley; integrated rear brake module leads to fixed overall axial length specific to 80 frame LMU11 version, with net equipment weight approximately 5.2kg under standard flange mounting dimension for direct bolt fixation on equipment base without transitional fixture.

Valid continuous working ambient temperature ranges from 0°C to +40°C; component storage permissible temperature spans -20°C to +70°C; applicable relative working humidity maintains between 5%RH and 80%RH under non-condensing environment to avoid internal circuit short caused by dew formation. When installation elevation exceeds 1000 meters above sea level, rated continuous load should be properly derated to offset decreased heat dissipation efficiency in thin air environment. The motor can resist standard industrial vibration within 10Hz~55Hz frequency scope; installation location with corrosive gas, continuous liquid splashing and dense conductive dust accumulation is prohibited to prolong service life of bearing, brake friction disc and internal winding parts.

UGJMED-80LMU11 is originally compatible with Yaskawa dedicated vintage Minertia DC servo driver series, supporting two mainstream external command input formats including ±10VDC analog speed instruction and differential pulse position command transmitted from upper PLC or compact CNC controller. The matched servo system enables free switching among position closed-loop control, speed closed-loop control and torque closed-loop control according to different production technological requirements. Benefiting from built-in power-off brake design, vertically installed equipment saves extra external mechanical locking fixture for gravity anti-drop protection. After complete system power failure, full mechanical origin homing operation must be executed before formal equipment startup to restore accurate mechanical zero position due to incremental-type LMU11 encoder structure without absolute position storage function.

Complete multi-layer safety protection is realized via coordination between internal sensing elements and paired servo amplifier. Winding over-temperature signal triggers servo overload automatic stop to protect coreless winding against thermal damage; open-circuit or poor contact of customized LMU11 encoder cable triggers dedicated encoder fault warning displayed on servo operation panel; winding short-circuit and abnormal overcurrent activates hardware overcurrent protection to cut off main power instantly; brake coil open or short-circuit fault outputs auxiliary alarm signal via drive terminal port. All encoder feedback signal circuits are equipped with noise filtering components to eliminate complex industrial electromagnetic interference and secure stable real-time position feedback transmission.

Only original UGJMED-80LMU11 spare unit supports direct on-site replacement; non-brake variant or same-power motor with different encoder specification cannot be substituted directly unless full connector rework and complete servo parameter recalibration are finished after replacement. Before disassembling motor for bearing maintenance, brake disc inspection or encoder overhaul, operators must fully disconnect 112VDC main armature power and 24VDC brake auxiliary power and wait no less than 15 minutes for full discharge of internal servo DC bus capacitor to eliminate residual high voltage and avoid electric shock hazard. Routine maintenance items include fastening rear connector fixing screws every three months, replenishing high-temperature resistant bearing grease after over 8000 continuous running hours and cleaning casing surface accumulated dust semi-annually to preserve original heat dissipation efficiency. Random modification on LMU11 exclusive encoder pin definition and internal wiring layout will lead to unexpected motor runaway and permanent servo drive locking fault.

This brake-equipped large-frame coreless DC servo motor is widely applied for heavy-load precision feed axis of medium-sized precision processing machinery, high-load indexing turntable of large component automated assembly production line, main drive axis of optical precision inspection and measuring equipment and compact high-power precision packaging automation equipment, especially suited for vertical installation working condition with frequent start-stop motion, high dynamic response demand and mandatory power-off anti-drop positioning requirement.