YASKAWA UGTMEM-01MMG42 Minertia T Series Coreless DC Servo Motor Specification

UGTMEM-01MMG42 is a compact miniature coreless DC servo motor belonging to Yaskawa Minertia T series, specially designed for precision micro-positioning platforms, optical inspection instruments, semiconductor assembling equipment and small automated precision machinery. Adopting proprietary cup-shaped coreless rotor structure without silicon steel lamination, the motor eliminates inherent cogging torque of conventional iron-core motors and achieves extremely smooth low-speed operation with negligible torque ripple. Thanks to ultra-low rotor inertia, the product delivers outstanding dynamic performance for frequent rapid acceleration and deceleration movements. This variant is constructed without built-in electromagnetic power-off holding brake to maintain compact outline and lightweight design, adopting totally enclosed natural convection cooling structure without auxiliary cooling fan. MMG42 stands for factory-customized differential incremental encoder with exclusive pin assignment and fixed internal wiring layout formulated by original manufacturer standards.

UGTMEM is the base series code for non-brake coreless DC servo motor of Minertia T family; numeric code 01 represents miniature frame size corresponding to 100W rated power grade; MMG indicates dedicated customized incremental encoder group with unique connector pin definition different from AW, SB and LMU series encoders; the number 42 defines factory-fixed encoder resolution, standard outgoing cable length and internal terminal arrangement without extra non-standard mechanical modification on shaft or housing.

The motor is rated for 90VDC armature input voltage and requires matching original Yaskawa Minertia T-series dedicated DC servo amplifier to form complete closed-loop control system. Continuous rated output power is 100W, rated full-load armature current is around 1.1A under nominal operating condition, with standard rated continuous rotating speed set at 3000rpm and permissible short-time peak no-load speed reaching 3800rpm. Instantaneous peak overload torque can reach up to five times the rated torque to satisfy high-cycle frequent start-stop and instant impact load requirements. The integrated MMG42 differential line-drive incremental encoder is equipped with UVW phase signal for pole position detection and follows exclusive factory wiring specification, which cannot be directly replaced by other types of encoders unless full connector rewiring and comprehensive servo parameter reset are completed. Internal stator winding complies with Class F insulation standard, fitted with embedded thermal sensing element that transmits overheat fault signal to matched servo drive to trigger automatic overload shutdown and protect coreless winding from over-temperature burnout. Surge suppression components are pre-installed inside internal wiring cavity to restrain industrial transient voltage surge and electromagnetic interference from surrounding inverter and switching devices.

The fully sealed motor housing reaches IP54 ingress protection grade and relies entirely on casing natural heat dissipation without additional cooling fan assembly. Front drive end is standard solid output shaft with integrated flat keyway for rigid connection with miniature precision reducer, tiny ball screw and timing belt pulley. Due to non-brake compact structure, the overall axial dimension is minimized, and total net weight of the complete motor unit is approximately 0.85kg with unified miniature flange mounting dimension for direct installation on compact equipment frame without extra transition fixture.

Valid continuous working ambient temperature ranges from 0°C to +40°C; permissible spare part storage temperature spans -20°C to +70°C; applicable working relative humidity is kept between 5%RH and 80%RH under non-condensing environment to avoid dew-induced internal circuit short-circuit damage. When installation altitude exceeds 1000 meters above sea level, continuous running load should be properly derated to offset decreased heat dissipation efficiency under thin air condition. The motor can withstand standard industrial vibration within 10Hz to 55Hz frequency range; installation locations with corrosive gas, continuous liquid splashing and dense conductive dust accumulation are prohibited to extend service life of front bearing, internal winding and encoder components.

UGTMEM-01MMG42 is originally compatible with vintage Yaskawa dedicated Minertia T-series DC servo driver units, supporting two mainstream external command input modes including ±10VDC analog voltage speed instruction and differential pulse position command transmitted from upper PLC or miniature CNC controller. The matched servo system supports free switching among position closed-loop control, speed closed-loop control and torque closed-loop control according to different production technological requirements. Without built-in power-off brake configuration, vertically mounted equipment using this motor needs to be equipped with independent external mechanical locking structure to prevent load free falling after unexpected power failure. Since incremental-type MMG42 encoder is adopted 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 point for subsequent precision positioning.

Multi-layer comprehensive safety protection is realized through cooperation between internal sensing elements and paired servo amplifier. Winding over-temperature signal triggers servo automatic overload shutdown to avoid coreless winding thermal damage; open circuit or poor contact of customized MMG42 encoder cable activates dedicated encoder fault warning displayed on servo operation panel; winding short-circuit and abnormal overcurrent input lead to hardware overcurrent protection and immediate main power cutoff. All internal feedback signal circuits are equipped with noise filtering components to filter complex on-site electromagnetic interference and guarantee stable position feedback signal transmission.

Direct on-site replacement requires identical original UGTMEM-01MMG42 spare motor; brake-equipped variant or same-power motor with different encoder specification cannot be directly substituted unless full connector rewiring and complete servo parameter reset are finished after replacement. Before disassembling motor for bearing inspection or encoder maintenance work, operators need to fully cut off 90VDC main armature power supply and wait no less than 15 minutes for full discharge of servo internal DC bus capacitor to eliminate residual high voltage and avoid electric shock risk. Regular maintenance items include tightening rear connector fixing screws every three months, replenishing high-temperature resistant bearing grease after accumulating over 8000 continuous running hours and cleaning casing dust every half year to retain original natural heat dissipation performance. Random modification to MMG42 exclusive encoder pin definition and internal wiring layout will lead to unexpected motor runaway and permanent servo drive locking fault.

This miniature non-brake coreless DC servo motor is widely applied for micro feed axes of bench-top precision testing instruments, small indexing positioning turntable of micro-component automated assembly line, fine drive unit of optical microscopic inspection equipment and compact miniature precision packaging automation machinery, especially suitable for horizontal installation working conditions with limited installation space, frequent start-stop movement and high-precision repeated positioning control requirement.