USAGED-05A21S belongs to discontinued classic Yaskawa USA series permanent magnet AC servo motor, rated 0.45kW industrial compact servo unit optimized for small CNC feed axes, automation index positioning mechanism, miniature lifting equipment and precision transfer machinery. This variant comes with built-in DC24V fail-safe electromagnetic brake marked by suffix S, standard UTOPH incremental encoder and dual round plug terminal layout for power and encoder wiring, perfectly matched with original CACR-SR05 series servo amplifier without firmware modification. It adopts totally enclosed self-cooled housing design for compact installation space and reliable continuous operation under moderate load conditions.

USAGED is base code for fully enclosed self-cooled Yaskawa USA servo series; numeral 05 stands for 0.45kW power class; character A denotes standard internal structure and standard encoder configuration; first digit 2 means straight solid output shaft with factory standard flat key slot; second digit 1 defines standard dual rear round plug connector wiring structure; suffix S indicates integrated internal DC24V power-off holding brake for anti-drop vertical installation requirement.

The motor is designed for three-phase AC 200V~230V 50/60Hz industrial input power. Its rated continuous output power is 0.45kW with rated operating current at 3.8A and fixed rated rotational speed of 1500rpm. Continuous rated torque reaches 2.87Nm while instantaneous peak overload torque can achieve three times rated torque to satisfy short-time heavy startup and impact load demand. The embedded electromagnetic brake runs on DC24V excitation voltage, which releases the motor shaft upon DC24V power input and mechanically locks output shaft immediately once auxiliary power cuts off to prevent free falling for vertical mounting applications.Feedback device is UTOPH-81AVF differential line driver incremental rotary encoder with 8192 pulses per revolution, universal pin assignment fully compatible with original CACR-SR05 servo drive without extra wiring adjustment. Stator winding applies Class F insulation grade to ensure stable dielectric performance during long-period full-load cyclic operation, and built-in winding thermal detection circuit sends overheat alarm signal to paired servo unit for overload protection activation.

This servo motor uses full closed casing with IP50 protection grade and natural self-convection cooling without external rear cooling fan, featuring compact overall dimension compared with forced air cooling C-type models. Output shaft is standard solid straight shaft machined with standard keyway for direct coupling connection with small ball screw or mini reducer; overall net weight is around 3.2kg due to added internal brake module structure. Standard flange mounting dimension follows unified Yaskawa USA-series installation specification for direct equipment fixation without extra adapter machining.Valid operating ambient temperature ranges from 0°C to +40°C, permissible storage temperature covers -20°C to +70°C; applicable working relative humidity keeps within 5%~80%RH under non-condensation environment. When installation altitude exceeds 1000 meters above sea level, continuous rated loading must be properly derated to avoid overheating caused by declined heat dissipation efficiency at high elevation. Working surroundings with corrosive gas, continuous liquid splash or heavy conductive dust accumulation are prohibited, and the unit can bear standard industrial vibration within 10Hz~55Hz frequency range.

USAGED-05A21S exclusively matches original Yaskawa CACR-SR05 servo amplifier under factory default parameter setting without driver hardware upgrade or program rewrite. Corresponding servo system supports two mainstream command input types: ±10V analog voltage speed instruction and differential pulse position command transmitted from upper CNC or PLC controller, which meets frequent forward-reverse reciprocating motion and micron-level repetitive positioning requirement of small precision automation equipment.For vertical installation condition, internal built-in brake cancels extra external mechanical anti-fall fixture; brake control terminal connects to DC24V auxiliary power supplied from servo unit to realize synchronous brake release together with servo main power switch-on and instant shaft locking upon unexpected power failure. Complete closed-loop speed and position control can be activated after basic encoder parameter setup on matched servo panel.

Multiple protective circuits are integrated inside the motor and matched servo control system. Internal winding temperature sensor triggers servo overload stop protection to prevent winding burnout from long-term overloading operation; encoder cable disconnection or poor contact will trigger driver specified disconnection alarm code; sustained excessive load operation activates overload fault alert while stator winding short-circuit and abnormal overcurrent result in overcurrent protection shutdown. Internal signal circuit is equipped with surge suppression components to improve anti-interference capability against industrial field instantaneous power surge and electromagnetic noise interference.

Field direct replacement requires identical USAGED-05A21S original model; non-brake variant without suffix S or different wiring structure models cannot be directly substituted unless full driver parameter reset and complete wiring rearrangement are finished after replacement. Before disassembling for bearing inspection, encoder repair or internal component maintenance, users must fully cut off three-phase main power and wait no less than 15 minutes for servo internal DC bus capacitor full discharge to eliminate residual high voltage for electric shock prevention.Regular periodic maintenance includes tightening power and encoder plug terminal screws every three months, replenishing bearing lubricant grease after every 8000 cumulative running hours and cleaning dust accumulated on motor casing every half year to maintain rated heat dissipation performance. Random modification on internal encoder pin definition, brake coil wiring or stator winding connection will lead to servo runaway movement and permanent driver fault locking.

This servo motor is widely deployed on small vertical feed axes of miniature CNC milling and drilling machines, indexing rotary table of automated assembly lines, small material lifting automation equipment, packaging precision positioning drive and customized compact non-standard automated machinery, especially suitable for vertical mounting working condition requiring power-off shaft holding and continuous moderate-torque cyclic operation with strict positioning accuracy standard.