June 05, 2026

YASKAWA UAJPEE-22DKGFU AC Servo Motor Specification

UAJPEE-22DKGFU belongs to Yaskawa UAJPE dedicated turret servo product line, a medium-frame permanent magnet AC servo motor equipped with integrated power-off electromagnetic brake, specially custom-engineered for OEM automatic tool turret drive on medium-sized precision CNC lathes from mainstream Japanese machine tool manufacturers. The motor adopts laminated stator core and high-performance rare-earth permanent magnet rotor construction, optimized for continuous low-speed high-torque delivery, frequent forward-reverse jogging and high-precision angular positioning during turret station switching and tool clamping cycles. Entire motor casing features fully enclosed IP54 protection grade with passive natural convection cooling without external cooling fan installation. The suffix letter E confirms factory pre-installed DC24V power-loss holding brake at rear housing, which mechanically locks output shaft instantly once auxiliary brake power cuts off to eliminate unexpected turret slippage caused by sudden power blackout. DKGFU stands for exclusive OEM customization specification covering proprietary incremental encoder resolution parameter, unique multi-core aviation connector pin definition, customized internal terminal wiring layout and non-standard output shaft dimensional tolerance. Compared with DK2TU variant of same UAJPEE-22 frame, DKGFU owns totally different encoder pin assignment and internal winding configuration, making direct interchange impossible unless complete connector recabling, harness replacement and full servo drive parameter reset plus field commissioning are finished. Original mass production of this model has been discontinued by Yaskawa; available spare motors in global industrial market mainly derive from dismantled scrapped CNC equipment and professionally overhauled refurbished units.

Description

YASKAWA UAJPEE-22DKGFU AC Servo Motor Specification

1. Product Overview

2. Model Code Definition

UAJPEE serves as base series code for UAJPE-series servo motors with built-in DC24V electromagnetic holding brake; numeric digit 22 represents medium frame size corresponding to fixed rated continuous power of 750W. Letter D denotes embedded incremental rotary encoder for full closed-loop position feedback control; K stands for rear-end integrated multi-pin aviation plug connection instead of discrete flying lead wiring. G indicates customized internal terminal layout, casing inner structure and fixed coil wiring standard set by designated OEM factory; combined FU suffix covers exclusive custom specifications including dedicated encoder pulse count, modified shaft keyway dimension and non-universal cable pinout matching exclusive turret control system. Every character combination of DKGFU forms independent customized specification, which differentiates its connector definition and feedback signal protocol from DK2TU, DK2FB or other same-frame derivative codes, resulting in incompatible direct replacement without hardware modification and servo parameter readjustment.

3. Electrical Specifications

This servo motor is rated for three-phase 200VAC industrial power input and must be matched with original vintage Yaskawa dedicated turret servo amplifier. Continuous rated output power is stabilized at 750W with factory-calibrated rated full-load current and base rotational speed complying with standard medium-size turret indexing working cycle requirement. Instantaneous peak overload torque can reach three times of nominal rated torque to absorb transient impact load generated during turret tight clamping and emergency rapid positioning actions. Independent external 24VDC auxiliary power feeds built-in holding brake; brake coil gets energized to release output shaft for normal motor rotation, while power cutoff triggers immediate mechanical locking to fix turret mechanical position reliably. Onboard incremental encoder follows exclusive DKGFU pin assignment and signal output definition, any mismatched wiring will lead to lost position closed-loop feedback and uncontrolled motor runaway fault. Internal stator winding complies with Class F insulation standard, embedded with thermal detection element which transmits overheat warning signal to paired servo drive to activate automatic power-off protection and prevent winding burnout under over-temperature condition. Surge absorption components are pre-installed inside terminal cavity to suppress instantaneous voltage spike and electromagnetic interference induced by surrounding inverters and switching electronic components inside machine control cabinet.

4. Mechanical and Environmental Specifications

Fully sealed motor housing realizes IP54 dustproof and splash-proof performance, completing heat dissipation totally via metal shell natural convection without auxiliary fan structure. Front driving end is solid integral output shaft with customized flat keyway tailored under DKGFU OEM standard for rigid coupling with turret intermediate reduction gear and transmission assembly. Due to additional rear-mounted brake module, overall axial body length is longer than non-brake UAJPEA-22 counterpart, while unified standard flange mounting dimension enables direct bolt fastening onto turret housing without extra transition fixture modification.

Valid continuous operating ambient temperature ranges from 0°C to +40°C; long-term spare part storage permissible temperature spans -20°C to +70°C; applicable working environment relative humidity is limited between 5%RH and 80%RH under non-condensation status to avoid dew accumulation triggering short-circuit damage on stator winding, brake coil and internal encoder circuit. When installation altitude exceeds 1000 meters above sea level, continuous rated operating load needs proper deration to compensate degraded heat dissipation efficiency under low atmospheric density. The motor can bear standard industrial vibration within 10Hz~55Hz frequency scope; installation location with persistent cutting fluid splashing, corrosive oil mist and piled conductive metal scrap is strictly forbidden to prolong service life of front bearing, brake friction pad and rear encoder assembly.

5. Drive Matching and Control Functions

UAJPEE-22DKGFU is originally designed to coordinate with Yaskawa legacy dedicated turret servo drives, supporting two mainstream command input modes including ±10VDC analog speed instruction and differential pulse position command transmitted from upper CNC lathe host controller. Matched servo control system supports free switching between position closed-loop and speed closed-loop control mode to fulfill rapid multi-station indexing, micron-level high-precision positioning and heavy-load mechanical clamping required by precision turning processing technology. Benefiting from factory pre-assembled power-off brake, obliquely or vertically installed turret structure no longer needs extra external mechanical locking fixture to avoid unexpected turret position drifting after accidental power outage. Equipped incremental encoder has no absolute position memory function, thus complete mechanical origin homing operation must be executed after full system power shutdown before automatic cyclic turret indexing resumes to restore accurate mechanical zero reference point of turret mechanism.

6. Protection and Fault Alarm Description

Multi-level comprehensive safety protection is realized through coordination between internal embedded sensing components and matched servo amplifier. Stator winding over-temperature signal triggers automatic servo main power cutoff to prevent permanent thermal damage of winding; open circuit or poor contact of DKGFU exclusive encoder connector will activate independent encoder fault alert displayed on servo operation panel; winding short-circuit and abnormal overcurrent induce hardware overcurrent protection with immediate main circuit power cut; open or short-circuit failure of built-in brake coil outputs auxiliary fault prompt via drive external terminal ports. All encoder feedback signal circuits are equipped with dedicated noise filtering elements to filter complex electromagnetic interference from peripheral machine tool wiring and guarantee stable real-time position signal transmission during long-period uninterrupted mass production operation.

7. Maintenance and Replacement Guidance

Direct on-site drop-in replacement requires identical original UAJPEE-22DKGFU spare motor; non-brake UAJPEA model or same-frame motors with different DK suffix specification such as DK2TU cannot be directly substituted unless full connector rewiring, complete servo parameter initialization and professional on-site commissioning are accomplished after installation. Before disassembling motor for bearing inspection, brake friction plate replacement or encoder maintenance work, maintenance personnel must fully disconnect three-phase main AC power and independent 24VDC brake auxiliary power supply, then wait no less than 15 minutes for full discharge of servo internal DC bus capacitor to eliminate residual high voltage and prevent electric shock hazard. Standard periodic maintenance includes tightening rear aviation connector fixing screws every three months, replenishing high-temperature resistant bearing grease after accumulating over 8000 continuous working hours and cleaning cutting fluid residue plus surface casing dust every half year to retain original natural heat dissipation efficiency. Arbitrary modification on exclusive DKGFU encoder pin definition and internal brake wiring layout will result in sudden uncontrolled motor rotation and permanent servo drive locking malfunction.

8. Typical Application Scope

This brake-equipped medium-size AC servo motor is widely configured to drive automatic indexing tool turrets on medium precision CNC lathes manufactured by Tsugami, Miyano and other well-known Japanese precision machine brands, extensively applied on miniature precision component automatic turning production lines and high-precision machining workshops. It is especially applicable for turret installation layout with moderate internal space, frequent station switching demand, strict repeated positioning accuracy standard and mandatory anti-displacement protection requirement under unexpected power failure circumstance.

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