USAFED-44C225 belongs to Yaskawa classic discontinued F-series VS800 heavy-duty permanent magnet AC servo motor lineup, engineered exclusively to match customized CACR-SR100 series servo amplifiers with dedicated modified internal firmware for heavy-load CNC machine feed axes and large-scale automated production equipment. This unit features rear external forced cooling fan structure without built-in power-off electromagnetic brake, and the trailing digit 5 stands for factory customized terminal wiring layout and modified UTOPH incremental encoder pin definition, restricting closed-loop operation only with paired special-version servo drives instead of standard universal CACR servo packs. It is widely equipped on heavy-duty vertical machining centers, large horizontal CNC lathes and heavy-load automated feeding machinery requiring continuous high-torque output and high-precision cyclic positioning performance.

USAFED denotes Yaskawa fully-enclosed F-type CNC dedicated servo base series; numeric code 44 corresponds to 4.4kW rated power grade; letter C represents external fan forced cooling structure, different from natural air-cooled FA/FB types; digits 22 mean standard solid keyed output shaft with standard shaft keyway; final digit 5 refers to factory-customized cable terminal definition and special modified UTOPH-81AUS incremental encoder wiring specification unique for designated matched servo controllers.

The motor is designed for three-phase AC 200V~230V, 50/60Hz industrial power input. Continuous rated output power is 4.4kW with rated full-load operating current of 30A, fixed rated rotational speed at 1500rpm and continuous rated output torque reaching 28.1Nm; instantaneous peak overload torque can hit three times the rated torque within short overload period to satisfy heavy-load startup and high-acceleration running demands. Equipped with UTOPH-81AUS differential line-drive incremental rotary encoder with fixed factory pulse specification and exclusive pin assignment defined by suffix 5, this customized encoder protocol cannot match ordinary unmodified CACR servo amplifiers and only supports dedicated CACR-SR100 customized servo drivers to complete full closed-loop position feedback control. Stator winding adopts Class F insulation standard to maintain stable dielectric property under long-hour continuous full-load running condition. No internal brake coil assembly is installed inside this model motor.

The whole motor housing is fully enclosed with IP50 protection grade and relies on rear-mounted independent cooling fan for forced heat dissipation instead of shell natural convection cooling, leading to longer overall axial length compared with natural cooling FA-series motors. Output shaft is solid keyed shaft with standard built-in keyway for rigid direct connection with ball screw or speed reducer; the net weight of this servo motor is around 12.6kg with standard industry flange mounting dimension for direct equipment fixation. Allowable working ambient temperature ranges from 0℃ to +40℃, storage temperature covers -20℃ to +70℃, and applicable operating relative humidity is limited within 5%~80%RH with no dew condensation permitted inside casing. When installation elevation exceeds 1000 meters above sea level, continuous rated output load needs reasonable derating to prevent overheating damage caused by deteriorated heat dissipation efficiency. Working surroundings containing corrosive gas, dense conductive dust or continuous liquid splashing are strictly forbidden; the motor can bear regular industrial vibration ranging from 10Hz to 55Hz with amplitude less than 0.5mm.

This customized 5-suffix servo motor can only coordinate with Yaskawa CACR-SR100 series servo units with factory modified firmware; generic non-customized CACR drivers fail to decode special encoder feedback signal and cannot achieve normal speed and position closed-loop control due to exclusive encoder and terminal definition of suffix 5. Two standard control command modes are available via matched servo amplifier: ±10V analog voltage speed instruction and differential pulse position command transmitted from external CNC host controller, which fully meets frequent forward-reverse reciprocating movement and high-repeat-precision positioning requirements of heavy-duty numerical control processing equipment. Owing to non-brake internal design, external mechanical locking fixture is required for vertical installation axes to avoid workpiece sliding down after unexpected main power cutoff.

Built-in stator winding temperature detection circuit transmits overheat abnormal signal to matched servo drive to trigger automatic overload shutdown protection. Unified factory-defined fault codes display on supporting servo panel: encoder cable open-circuit or poor contact triggers fault No.6, long-term continuous overloaded running activates No.7 overload alarm, stator winding short-circuit and abnormal overcurrent leads to No.1 overcurrent fault alert; additionally, rear cooling fan stall or open-loop fault will trigger auxiliary pre-overheat warning on driver to remind field maintenance before winding overheat burnout occurs. Internal signal circuit is fitted with surge suppression components to strengthen anti-interference performance against instantaneous power surge and industrial field electromagnetic interference.

Direct on-site replacement must adopt identical original USAFED-44C225 model; alternative specifications including brake-equipped FB variant or standard non-custom 22-ending motors cannot be directly substituted unless matched servo drive undergoes official factory firmware rewrite and full parameter resetting. Before any disassembly work for bearing inspection, encoder maintenance or fan overhaul, fully disconnect three-phase main power supply and wait no less than 15 minutes for complete discharge of servo internal DC bus capacitor to eliminate residual high voltage and avoid electric shock hazard. Routine maintenance tasks include fastening power and encoder wiring terminals every three months, supplementing bearing lubrication grease after every 8000 cumulative operating hours, and cleaning dust accumulated on cooling fan blades every half year to guarantee effective heat dissipation. Random modification of internal encoder pin definition or power wiring will result in servo runaway and permanent driver fault lockout.

Mainly applied for X/Y/Z heavy-load feed axis driving of large vertical machining centers, heavy-duty CNC lathes, automatic heavy material conveying production lines and customized non-standard heavy-load automation equipment, especially suitable for high-load continuous cyclic operation and high-precision repeated positioning machining working scenarios.