YASKAWA USAREM-02D-SW12 AC SERVO MOTOR PRODUCT SPECIFICATION

USAREM-02D-SW12 is a compact permanent magnet AC servo motor belonging to Yaskawa classic USAREM series, rated at 200W nominal power and developed for small-scale precision automation and miniature processing equipment motion control. This motor adopts totally enclosed natural convection cooling structure without auxiliary cooling fan, built without electromagnetic power-off brake by default, and is configured with SW customized specification incremental rotary encoder defined by suffix SW12 for exclusive wiring and pin assignment layout different from standard general versions. Featuring small frame dimension, low rotor inertia and smooth low-cogging torque output, the unit delivers fast dynamic response for frequent acceleration, deceleration and intermittent start-stop operation, and its standardized flange mounting layout saves installation space for compact mechanical equipment layout. The SW marking stands for factory-customized encoder connector definition and exclusive rear cable arrangement tailored for matching specified Yaskawa legacy servo amplifier models instead of universal standard wiring configuration.

USAREM represents base series code for small inertia natural-cooling AC servo motor of Yaskawa; numeric digit 02 refers to 200W rated power specification; letter D indicates non-brake basic motor structure with standard solid output shaft; SW stands for OEM customized incremental encoder and exclusive connector wiring specification; numeral 12 is factory internal variant code for dedicated cable length and terminal configuration of this specific model.

The motor is designed to operate with three-phase AC 200V to 230V industrial input voltage, compatible with both 50Hz and 60Hz industrial power grid standards. Its continuous rated output power is fixed at 200W, corresponding rated full-load running current reaches 2.9A under nominal working condition, with standard rated rotational speed set at 3000rpm and continuous rated output torque of 0.64Nm. Instantaneous peak overload torque can reach three times of continuous rated torque to satisfy instant heavy startup load and rapid acceleration requirement for short-time impact working condition. The internally fitted differential line-drive incremental encoder follows SW12 exclusive pin definition, which can directly mate with matched Yaskawa vintage servo drive without additional wiring modification or parameter reset. Motor stator winding is manufactured under Class F insulation standard, with embedded internal temperature sensing component that feeds overheat abnormal signal to paired servo driver to trigger automatic overload stop protection and prevent winding thermal burnout under long-term overloaded operation. Built-in surge absorbing components inside internal wiring cavity effectively suppress instantaneous power surge and electromagnetic interference generated by peripheral inverter and switching devices on industrial site.

The whole motor casing adopts fully sealed construction with IP54 environmental protection grade and completely relies on housing natural heat dissipation without extra cooling fan assembly. Front-end output shaft is standard solid shaft equipped with integrated flat keyway for rigid connection with miniature ball screw, small reducer or timing wheel transmission parts; without rear brake module installation space, the overall axial dimension is shorter than brake-equipped same-power servo variants, and the net overall weight of complete motor unit is around 2.3kg with unified standard flange mounting size for convenient direct installation on equipment rack without extra transition fixture.Valid continuous working ambient temperature ranges from 0°C up to +40°C, permissible spare part storage temperature spans -20°C to +70°C during long-term inventory period; applicable working environment relative humidity maintains between 5%RH and 80%RH under non-condensation status to avoid internal circuit short circuit caused by dew accumulation inside motor housing. When installation elevation exceeds 1000 meters above sea level, users need to properly derate continuous running load to compensate reduced heat dissipation efficiency under thin air condition. The motor can withstand regular industrial vibration within 10Hz to 55Hz frequency range; installation locations with corrosive chemical vapor, continuous liquid splash and heavy conductive dust accumulation are prohibited to extend service life of front bearing, internal winding and encoder components.

USAREM-02D-SW12 is originally matched with Yaskawa early small-power servo drive units from legacy series, supporting dual 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 enables flexible switching among position closed-loop control, speed closed-loop control and torque closed-loop control to satisfy different production process requirements of automated equipment. As the motor does not integrate built-in power-off brake, vertical-axis installation application needs to be equipped with independent external mechanical locking structure to prevent load sliding down caused by unexpected power cut. Due to incremental-type encoder configuration, complete mechanical origin homing operation must be executed after full system power outage before formal production startup to recover accurate mechanical zero position.

Cooperating with paired servo amplifier, the motor realizes multi-level comprehensive safety protection functions. Stator winding over-temperature signal triggers servo overload shutdown to protect winding from overheat damage; open circuit or poor contact of customized SW12 encoder cable will activate dedicated encoder fault warning displayed on servo panel; winding short-circuit and abnormal input overcurrent leads to hardware overcurrent protection and immediate main power cutoff; abnormal internal circuit short or open of feedback loop outputs corresponding fault prompt on driver terminal. All internal signal circuits are fitted with noise suppression parts to reduce external electromagnetic interference and guarantee stable position feedback signal transmission in complicated industrial electromagnetic environment.

For on-site direct replacement maintenance, users must select identical original USAREM-02D-SW12 spare motor; non-SW customized encoder version or brake-equipped variant cannot be directly substituted unless complete connector rewiring and full servo parameter reset are finished after replacement. Before disassembling motor for bearing inspection, encoder maintenance or internal circuit overhaul work, operators need to fully cut off three-phase main power supply and wait no less than 15 minutes for complete discharge of internal DC bus capacitance of matched servo drive to eliminate residual high voltage and avoid electric shock hazard. Regular maintenance works include tightening rear connector fixing screws every three months, replenishing high-temperature resistant bearing grease after accumulating over 8000 continuous running hours and cleaning dust attached on motor outer casing every half year to keep original natural heat dissipation performance. Random modification to SW12 specified encoder pin definition and internal wiring layout will lead to motor runaway or permanent servo driver locking fault.

This compact servo motor is widely applied to small feed axes of bench miniature drilling and tapping machine, indexing rotary platform of small parts automated assembly line, precision positioning drive of lightweight packaging machinery and customized small non-standard automation equipment, especially suitable for horizontal installation working condition with medium cyclic load, frequent start-stop motion and compact installation space limitation requirements.