YASKAWA UGRMEM-04AW14 Minertia RM Series Coreless DC Servo Motor Product Specification

UGRMEM-04AW14 belongs to Yaskawa classic Minertia RM series coreless permanent magnet DC servo motor, a mid-power coreless drive unit developed for medium-load precision automation, precision test platforms, semiconductor micro-assembly and optical inspection equipment. Adopting proprietary cup-type coreless rotor structure without iron core lamination, this design eliminates cogging torque inherent to conventional iron-core servo motors and enables ultra-smooth low-speed operation with minimal speed ripple and ultra-low rotor inertia for outstanding dynamic acceleration responsiveness. This base version excludes built-in electromagnetic power-off holding brake to retain compact body dimension and lightweight layout, relying fully on shell natural convection passive cooling without auxiliary cooling fan structure. The digit 04 stands for fixed frame specification corresponding to 400W rated power tier within RM lineup; AW14 refers to factory-customized differential incremental line-drive encoder with exclusive pin assignment, internal wiring definition and dedicated outgoing cable configuration fixed by factory standard, no extra OEM customized mechanical suffix on shaft or housing compared with standard catalog variant.

UGRMEM is unified base model prefix for non-brake RM-series coreless DC servo motor; numeric digit 04 marks standard frame size and 400W rated power grade; AW represents exclusive customized incremental encoder grouping independent from MSY, MYR and other standard encoder types of RM series; double-digit suffix 14 defines factory-fixed encoder resolution, internal terminal wiring layout and standard cable length specification without customized shaft machining or housing modification on regular production version.

This servo motor is designed for rated 90VDC armature input voltage and must be paired with dedicated vintage Yaskawa Minertia RM series DC servo amplifier to construct complete closed-loop motion control system. Continuous rated output power reaches 400W, rated armature input current under full-load nominal working condition is around 3.7A with standard rated continuous rotating speed set at 3000rpm, maximum intermittent no-load revolving speed can hit 4000rpm for short-time high-speed positioning demand. Instantaneous peak overload torque can reach up to 5 times rated torque to support frequent rapid start-stop, abrupt deceleration and transient impact load under high-cycle automated production conditions. The built-in AW14 differential incremental encoder follows proprietary factory wiring protocol, which cannot be directly replaced with other encoder variants unless full connector rewiring and complete servo drive parameter recalibration are finished. Internal stator winding complies with Class F insulation grade, embedded with built-in thermal detection component that transmits overheat alarm feedback signal to matched servo driver to activate automatic power cutoff and avoid winding burnout caused by over-temperature deterioration; internal terminal cavity is equipped with surge absorption components to suppress industrial field voltage spike and electromagnetic interference from surrounding inverter and switching power equipment.

Motor outer enclosure adopts IP54 ingress protection rating with fully enclosed passive natural heat dissipation design without additional cooling fan setup. Front drive end features solid round output shaft with integrated flat keyway for rigid connection with precision miniature reducer, small ball screw and timing belt pulley; consistent with standard 04-frame non-brake dimension and unified flange mounting specification for direct bolt fixation onto equipment base without transitional fixture, total net equipment weight is approximately 1.8kg under factory standard configuration.

Valid continuous working ambient temperature ranges from 0°C to +40°C; permissible long-term component storage temperature spans -20°C to +70°C; applicable working relative humidity maintains 5%RH to 80%RH under non-condensing environment to prevent dew condensation induced internal circuit short-circuit failure. When installation altitude exceeds 1000 meters above sea level, rated continuous output load requires appropriate deration to compensate heat dissipation degradation under thin air condition. The motor can withstand standard industrial vibration within 10Hz~55Hz frequency band; installation in environment containing corrosive gas, persistent liquid splash and dense conductive dust deposition is prohibited to extend service life of bearing, coreless rotor winding and internal AW14 encoder assembly.

UGRMEM-04AW14 is originally compatible with matching dedicated Minertia RM DC servo amplifier series from Yaskawa, supporting two mainstream external command input formats including ±10VDC analog speed instruction and differential pulse position command transmitted from upper PLC or compact miniature CNC controller. The matched servo control system supports free switching among position closed-loop control, speed closed-loop control and torque closed-loop control to satisfy diversified process requirements of precision automation equipment. Due to non-brake original configuration, vertical installation application scenarios need additional independent external mechanical locking fixture to avoid free fall of suspended load under unexpected system power loss. Since AW14 belongs to pure incremental feedback encoder without absolute position memory function, complete mechanical origin homing operation is mandatory after full system power cut before formal equipment startup to recover accurate mechanical zero reference position.

Multi-layer comprehensive safety protection is realized via coordinated operation between internal embedded sensing components and matched servo amplifier unit. Winding over-temperature feedback signal triggers automatic servo shutdown to protect coreless winding from thermal damage; open-circuit or poor contact fault of customized AW14 encoder cable will trigger dedicated encoder malfunction warning displayed on servo operation panel; winding short-circuit and abnormal overcurrent state activates hardware overcurrent protection with instant main power cutoff; abnormal encoder power supply circuit outputs auxiliary fault signal via driver external terminal port. All AW14 encoder feedback signal circuits are fitted with multi-stage noise filtering components to filter complex industrial electromagnetic interference and guarantee stable real-time position signal transmission.

Only original UGRMEM-04AW14 spare unit supports direct on-site replacement; brake-equipped variant or same-power motor configured with different specification encoder cannot be substituted directly unless full connector modification and overall servo parameter reset are completed post replacement. Before disassembling motor for bearing maintenance, encoder inspection or internal wiring overhaul, maintenance personnel must completely disconnect 90VDC main armature power supply and wait more than 15 minutes for full discharge of internal servo DC bus residual capacitance to eliminate residual high voltage and prevent accidental electric shock hazard. Routine periodic maintenance includes tightening rear encoder connector fixing screws every three months, supplementing high-temperature resistant bearing grease after accumulating over 8000 continuous running hours and cleaning casing surface accumulated dust every six months to preserve original passive heat dissipation efficiency. Arbitrary modification on exclusive AW14 encoder pin definition and internal wiring layout will lead to unexpected motor runaway and irreversible servo drive locking fault.

This compact mid-power non-brake coreless DC servo motor is widely deployed for medium-load precision feed axis of bench-top precision detection equipment, small indexing rotary table of miniature electronic component automated assembly line, fine drive unit of optical microscopic measuring machinery and compact medium-power precision packaging automation equipment, especially applicable for space-limited horizontal installation working condition requiring frequent start-stop action and high dynamic positioning response performance.