USAFED-44CA2 belongs to Yaskawa classic discontinued F-series heavy-duty permanent magnet AC servo motor, developed to match CACR-SR44 series standard servo amplifiers for heavy-load CNC feed axes and high-load automated production equipment. This model features rear external forced fan cooling structure without built-in power-off electromagnetic brake; CA stands for revised terminal wiring layout and standard universal incremental encoder specification, suffix digit 2 refers to standard straight keyed output shaft definition compatible with regular standard servo drivers instead of customized exclusive version motors. It is widely installed on medium and heavy-duty vertical machining centers, CNC lathes and automated feeding equipment requiring steady continuous high torque and stable repetitive positioning precision.

USAFED represents Yaskawa fully-enclosed F-type CNC dedicated servo base series; numeric 44 corresponds to rated 4.4kW power grade; letter C denotes external forced fan cooling structure differing from natural air-cooled FA/FB models; letter A means standard general-purpose UTOPH incremental encoder with universal pin assignment and common terminal definition; final digit 2 stands for standard straight solid shaft with integrated shaft keyway for coupling installation.

This servo motor is designed for three-phase AC 200V~230V, 50/60Hz industrial power supply input. Continuous rated output power is 4.4kW, rated continuous working current is 30A, fixed rated rotational speed at 1500rpm and continuous rated torque reaches 28.4Nm; instantaneous peak overload torque can reach three times rated torque within short-time overload duration to satisfy heavy startup acceleration and sudden load impact operating requirements. It is equipped with standard UTOPH-81AUS differential line driver incremental rotary encoder with universal pulse count and common pin definition, which can work normally with all original unmodified CACR-SR44 standard servo packs without special customized firmware upgrade. Stator winding adopts Class F insulation grade to guarantee stable dielectric performance under long-term full-load continuous running; no internal brake coil is preinstalled inside motor body.

The motor adopts full enclosed housing with IP50 protection rating and relies on rear independent external cooling fan for forced heat dissipation, resulting in longer overall axial dimension compared with natural convection cooled FA series motors. Output shaft is standard straight solid shaft with built-in standard keyway for rigid connection with ball screw or speed reducer assembly; the net weight of USAFED-44CA2 is approximately 12.5kg with universal standard flange mounting size for direct equipment fixing installation. Allowable working ambient temperature ranges from 0℃ to +40℃, storage temperature spans -20℃ to +70℃, applicable operation relative humidity is controlled between 5%~80%RH with no internal casing condensation allowed. When installation altitude is higher than 1000 meters above sea level, continuous rated load should be properly derated to avoid overheating damage caused by degraded heat dissipation efficiency. Working environment with corrosive gas, dense conductive dust and continuous liquid splashing is prohibited; the motor can withstand regular industrial vibration within 10Hz~55Hz working frequency range.

USAFED-44CA2 can be matched with regular Yaskawa CACR-SR44 series standard servo amplifiers without customized factory firmware modification; universal standard encoder signal enables normal full closed-loop speed and position control after basic parameter setting on matched driver. Two mainstream control command modes are supported via matched servo unit: ±10V analog voltage speed instruction and differential pulse position command transmitted from upper CNC controller, which adapts frequent forward-reverse cyclic movement and high-precision positioning demands of numerical control processing and automatic production equipment. Since there is no built-in brake structure, external mechanical anti-falling locking fixture is necessary for vertical installation axes to prevent sliding drop after unexpected main power cut-off.

Built-in stator winding temperature detection circuit transmits overheat abnormal signal to matched servo driver to activate automatic overload stop protection. Standard factory unified fault alarm definition applies on matching servo panel: encoder cable disconnection or poor contact triggers No.6 fault alert, long-time continuous overload operation leads to No.7 overload alarm, stator winding short-circuit and abnormal overcurrent causes No.1 overcurrent fault display. Rear cooling fan stall or open-circuit fault will trigger auxiliary pre-overheat warning on servo drive to remind field maintenance before winding overheat burnout occurs. Internal signal circuit is equipped with surge suppression components to improve anti-interference ability against industrial instantaneous power fluctuation and electromagnetic noise interference on site.

Direct field replacement requires original USAFED-44CA2 model; standard 44Cxx non-A suffix customized motors or brake-equipped FB variants cannot be directly substituted due to different encoder wiring definition and terminal layout unless relevant driver parameters are fully reset after replacement. Before disassembling for bearing inspection, encoder maintenance or cooling fan overhaul, fully cut off three-phase main power supply and wait at least 15 minutes for complete discharge of servo internal DC bus capacitor to eliminate residual high voltage and prevent electric shock risk. Routine maintenance includes fastening power and encoder wiring terminals every three months, replenishing bearing lubricating grease after every 8000 cumulative running hours, cleaning accumulated dust on cooling fan blades every half year to ensure effective heat dissipation. Random modification of internal encoder pin definition and motor internal wiring will cause servo runaway and permanent driver fault lockout.

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