YASKAWA UGJMEE-02SB4X Minertia J-Series Coreless DC Servo Motor Specification

UGJMEE-02SB4X belongs to Yaskawa classic Minertia J-series miniature coreless permanent magnet DC servo motor, specially developed for compact precision automation equipment, laboratory inspection instruments and miniature positioning platforms. It adopts exclusive cup-shaped coreless rotor design without silicon steel laminated core inside winding structure, thoroughly eliminating inherent cogging torque of traditional iron-core servo motors and delivering ultra-stable low-speed running with negligible speed fluctuation and ultra-low rotor inertia for outstanding dynamic response performance. This model is non-brake basic configuration without built-in electromagnetic holding brake, realizing compact body size and lightweight layout relying on full-shell natural convection cooling without auxiliary cooling fan. SB4 stands for factory customized differential incremental encoder with exclusive internal wiring and dedicated connector pin assignment, while suffix X represents non-standard OEM mechanical modification on output shaft dimension or outgoing cable layout compared against standard SB4 base variant. The digit 02 marks fixed frame size corresponding to 200W rated power tier of J-series miniature servo lineup.

UGJMEE is base serial identifier for J-series coreless DC servo motor without integrated power-off brake structure; numeral 02 denotes standard small frame dimension and 200W continuous rated output power specification; SB represents customized incremental encoder subdivision with proprietary pin definition differing from LB, LMU and SOD encoder series; digit 4 defines default factory cable length, base encoder resolution and terminal layout standard; trailing X indicates customized mechanical processing on shaft, housing or outgoing wiring as exclusive OEM modified version unavailable in regular standard catalog.

The servo motor is rated at 90VDC armature input voltage and must be matched with Yaskawa dedicated Minertia series DC servo amplifier for closed-loop motion control system setup. Continuous rated output power is 200W, rated full-load armature current is approximately 2.9A with nominal rated rotating speed fixed at 3000rpm under continuous rated working condition. Instantaneous peak overload torque can reach up to 3.3 times rated torque to satisfy frequent rapid acceleration, abrupt deceleration and short-duration transient impact load in high-cycle precision positioning applications. Equipped SB4X differential line-drive incremental encoder follows exclusive factory wiring specification and cannot be directly replaced with other types of encoders without complete connector rewiring and servo drive parameter recalibration. Internal stator winding conforms to Class F insulation standard with embedded thermal sensing component that feeds overheat fault feedback signal to matched servo drive to trigger automatic overload shutdown and prevent winding burnout from excessive temperature rise. Built-in surge suppression components inside terminal compartment effectively restrain industrial on-site surge voltage and electromagnetic interference generated by surrounding inverter and switching equipment.

Motor outer casing is constructed to IP54 ingress protection rating and completely adopts passive natural heat dissipation via housing surface without external cooling fan structure. Front driving end is standard solid output shaft with integrated flat keyway for rigid coupling with miniature precision reducer, small-size ball screw and timing belt pulley. Benefiting from non-brake design plus X-version customized mechanical adjustment, overall axial dimension differs slightly from standard SB4 same-power models, and total net weight is roughly 1.1kg with unified standard small flange mounting size enabling direct bolt fixation on compact equipment base without additional transition fixture.

Valid continuous operating ambient temperature scope ranges from 0°C to +40°C; permissible component storage temperature spans -20°C to +70°C; applicable working relative humidity maintains 5%RH~80RH under non-condensing working environment to avoid dew accumulation leading to internal circuit short-circuit damage. If installation altitude exceeds 1000 meters above sea level, rated continuous output load needs appropriate deration to compensate reduced heat dissipation efficiency under thin atmospheric condition. The motor is capable of enduring regular industrial vibration within 10Hz to 55Hz frequency range; installation locations with corrosive chemical gas, continuous liquid splashing and dense conductive dust accumulation are strictly forbidden to extend service lifespan of bearing, rotor winding and internal encoder parts.

UGJMEE-02SB4X is originally designed to pair with vintage Yaskawa dedicated Minertia DC servo driver units, supporting two mainstream external command input modes including ±10VDC analog speed instruction and differential pulse position command transmitted from upper PLC or compact miniature CNC controller. The matched servo system supports free mode switching among position closed-loop control, speed closed-loop control and torque closed-loop control according to varied technological requirements of precision equipment. Without built-in power-off brake structure, vertical installation applications need independent external mechanical locking component to prevent load falling under unexpected power failure. Since SB4X belongs to incremental feedback encoder without absolute position storage function, complete mechanical origin homing operation must be executed after full system power cut before formal equipment startup to recover accurate mechanical zero reference position.

Multi-level comprehensive safety protection is realized through coordination between internal embedded sensing components and matched servo amplifier unit. Winding over-temperature feedback signal triggers automatic servo shutdown to avoid thermal damage on coreless winding; open-circuit or poor contact of customized SB4X encoder cable activates exclusive encoder fault alarm displayed on servo operation panel; winding short-circuit and abnormal overcurrent condition triggers hardware overcurrent protection with instant main power cutoff; abnormal circuit status of encoder power supply outputs auxiliary warning signal via drive external terminal. All encoder feedback signal circuits are equipped with noise filtering components to filter complex industrial electromagnetic interference and guarantee stable real-time position signal transmission.

Direct on-site equipment replacement requires identical original UGJMEE-02SB4X spare motor unit; brake-equipped variant or same-power motor with different encoder specification cannot be directly substituted unless full connector rewiring and comprehensive servo parameter reset are finished post replacement work. Before disassembling motor for bearing inspection or encoder maintenance, operators must fully disconnect 90VDC main armature power supply and wait no less than 15 minutes for complete discharge of internal servo DC bus capacitor to eliminate residual high voltage and avoid accidental electric shock risk. Regular routine maintenance includes tightening rear connector fixing screws every three months, replenishing high-temperature resistant bearing grease after accumulating over 8000 continuous working hours and cleaning casing surface accumulated dust every half year to retain original heat dissipation performance. Random modification on exclusive SB4X encoder pin definition and internal wiring layout will result in unexpected motor runaway and irreversible servo drive locking fault.

This compact non-brake miniature coreless DC servo motor is widely applied for micro feed axis of bench-type precision testing instruments, small indexing positioning turntable of tiny component automated assembly line, fine drive unit of optical detection and microscopic measuring equipment and compact miniature precision packaging automation machinery, especially suitable for horizontal installation working conditions with frequent start-stop motion, ultra-high dynamic response requirement and limited installation space constraint.