YASKAWA UAJPEE-15DKGFU AC Servo Motor Specification
UAJPEE-15DKGFU is a factory customized AC servo motor belonging to Yaskawa UAJPE dedicated turret servo series, specially tailored for compact automatic tool turret driving of small precision CNC lathes from Japanese mainstream machine tool brands. This motor is constructed with conventional laminated stator and permanent magnet rotor layout optimized for low-speed constant high torque output, frequent forward and reverse rotation, as well as ultra-precise angular indexing required by turret station switching motions. The whole motor body adopts fully enclosed structural design with IP54 environmental protection grade and passive natural air cooling without external cooling fan device. Distinguished from non-brake UAJPEA counterparts, UAJPEE variant is preinstalled with integrated DC24V electromagnetic power-off holding brake at the rear section, which mechanically locks the output shaft instantly once brake auxiliary power is cut off to eliminate unexpected turret shifting risk caused by sudden power outage. DKGFU serves as exclusive OEM customized suffix specification covering proprietary incremental encoder wiring definition, unique rear aviation connector pin assignment, customized output shaft dimensional tolerance and special internal winding layout defined by original equipment factory standards. Due to differentiated internal circuit and mechanical processing parameters, this model cannot be directly replaced by other same-frame DK-series suffix versions such as DK2TU or DKGTA without full rewiring and servo parameter reconfiguration. The original production of this motor has been discontinued by Yaskawa, and available spare parts on market mainly come from dismantled used units and professionally refurbished spare motors recycled from scrapped CNC lathe equipment.
Description
YASKAWA UAJPEE-15DKGFU AC Servo Motor Specification
1. Product Overview
UAJPEE-15DKGFU is a factory customized AC servo motor belonging to Yaskawa UAJPE dedicated turret servo series, specially tailored for compact automatic tool turret driving of small precision CNC lathes from Japanese mainstream machine tool brands. This motor is constructed with conventional laminated stator and permanent magnet rotor layout optimized for low-speed constant high torque output, frequent forward and reverse rotation, as well as ultra-precise angular indexing required by turret station switching motions. The whole motor body adopts fully enclosed structural design with IP54 environmental protection grade and passive natural air cooling without external cooling fan device. Distinguished from non-brake UAJPEA counterparts, UAJPEE variant is preinstalled with integrated DC24V electromagnetic power-off holding brake at the rear section, which mechanically locks the output shaft instantly once brake auxiliary power is cut off to eliminate unexpected turret shifting risk caused by sudden power outage. DKGFU serves as exclusive OEM customized suffix specification covering proprietary incremental encoder wiring definition, unique rear aviation connector pin assignment, customized output shaft dimensional tolerance and special internal winding layout defined by original equipment factory standards. Due to differentiated internal circuit and mechanical processing parameters, this model cannot be directly replaced by other same-frame DK-series suffix versions such as DK2TU or DKGTA without full rewiring and servo parameter reconfiguration. The original production of this motor has been discontinued by Yaskawa, and available spare parts on market mainly come from dismantled used units and professionally refurbished spare motors recycled from scrapped CNC lathe equipment.
2. Model Code Definition
UAJPEE represents base series identifier for UAJPE-series servo motors with built-in power-off holding brake; numeral 15 stands for small frame size corresponding to rated continuous output power of 550W. Letter D indicates embedded incremental rotary encoder for closed-loop position feedback control; K refers to integrated rear multi-pin aviation plug connection instead of scattered loose lead wiring; G marks customized internal terminal wiring standard and casing internal structural layout; combined suffix FU denotes exclusive factory customization content including dedicated encoder resolution parameter, customized shaft keyway size and non-standard harness pin definition for matching specific OEM turret control system. Each character of DKGFU forms exclusive specification combination, leading to incompatible connector definition and feedback signal protocol against other derivative models with different suffix codes, thus cross replacement needs complete connector modification and servo drive commissioning on site.
3. Electrical Specifications
This servo motor is rated for three-phase 200V AC industrial power supply and must be matched with original dedicated vintage Yaskawa turret servo amplifier. Its continuous rated output power is fixed at 550W with rated working current set under nominal full-load operating condition, and rated base rotational speed is calibrated to match regular short-cycle turret indexing procedure of small precision lathes. Instant peak overload torque can reach three times of rated torque to bear transient impact load during turret tool clamping and emergency positioning movement. The built-in holding brake is independently powered by external 24VDC auxiliary power source; brake coil is energized to release shaft for normal motor rotation, while power cutoff triggers instantaneous mechanical locking of output shaft to fix turret mechanical position steadily. The onboard incremental encoder follows DKGFU exclusive pin assignment and signal output specification, any mismatch of wiring definition will result in lost position feedback and uncontrolled motor runaway. Internal stator winding is manufactured complying with Class F insulation standard, equipped with embedded thermal sensing component which transmits overheat alarm signal to matched servo drive to activate automatic shutdown for winding burnout prevention. Surge absorption components are arranged inside terminal cavity to suppress transient voltage surge and electromagnetic interference generated by surrounding inverters and switching electronic components inside machine control cabinet.
4. Mechanical and Environmental Specifications
The fully sealed motor housing meets IP54 dust-proof and splash-resistant standard, achieving whole-unit heat dissipation via metal shell natural convection without additional cooling fan installation. Front driving end is solid output shaft with standard integrated flat keyway for rigid coupling with turret intermediate reduction gear and transmission assembly. Thanks to the rear integrated brake module, overall axial length is longer than non-brake same-frame UAJPEA motor, while unified standard flange mounting dimension enables direct bolt fastening onto turret housing without extra transition adapter fixture.
Permissible continuous working ambient temperature ranges from 0°C to +40°C; long-term spare part storage temperature covers -20°C to +70°C; applicable working environment relative humidity is between 5%RH and 80%RH under non-condensation condition to avoid dew formation causing short-circuit damage on winding, brake coil and encoder internal circuit. When installation altitude exceeds 1000 meters above sea level, continuous rated load needs proper deration to compensate declined heat dissipation efficiency under low atmospheric density circumstance. The motor can endure standard industrial vibration within frequency scope of 10Hz to 55Hz; installation location with continuous cutting fluid splashing, corrosive oil mist and piled conductive metal powder is forbidden to extend service life of front bearing, brake friction disc and rear encoder assembly.
5. Drive Matching and Control Functions
UAJPEE-15DKGFU is originally paired with Yaskawa dedicated vintage servo drives designed exclusively for CNC turret control, supporting two mainstream command input modes including ±10VDC analog speed instruction and differential pulse position command delivered from upper lathe CNC controller. The matched servo control system supports free switching between position closed-loop and speed closed-loop control to realize rapid turret station indexing, high-precision angular positioning and reliable mechanical clamping required by precision turning processing technique. Benefiting from factory pre-installed power-off brake, vertically or obliquely mounted turret structures no longer require extra external mechanical locking device to prevent accidental position drift after unexpected power failure. Equipped with incremental-type encoder without absolute position memory function, the complete origin homing operation has to be executed after full system power cut before automatic turret indexing cycle to restore accurate mechanical zero reference point of turret mechanism.
6. Protection and Fault Alarm Description
Multi-level comprehensive safety protection is realized via coordination between internal built-in sensing parts and matched servo amplifier. Stator winding over-temperature signal triggers automatic servo power-off protection to prevent permanent thermal damage of winding; open circuit or poor contact of customized DKGFU encoder connector will trigger independent encoder fault alert displayed on servo operation panel; winding short-circuit and abnormal overcurrent lead to hardware overcurrent protection with immediate main power cutoff; open or short fault of built-in brake coil outputs auxiliary fault signal via external drive terminal port. All encoder feedback signal circuits are fitted with noise filtering elements to filter complex electromagnetic interference from peripheral machine tool circuits and guarantee stable real-time transmission of position feedback signal during long-term continuous production operation.
7. Maintenance and Replacement Guidance
Direct field replacement requires identical original UAJPEE-15DKGFU spare motor unit; non-brake UAJPEA model or same-frame motor with different DK suffix specification cannot be directly substituted unless full connector rewiring and complete servo parameter reset as well as on-site commissioning are finished after installation. Before disassembling motor for bearing inspection, brake friction plate maintenance or encoder overhaul work, maintenance staff must completely disconnect three-phase main AC power and independent 24VDC brake auxiliary power supply, then wait for no less than 15 minutes to finish full discharge of servo internal DC bus capacitor so as to eliminate residual high voltage and avoid electric shock hazard. Regular maintenance routines include tightening rear aviation connector fixing screws every three months, supplementing high-temperature resistant bearing grease after accumulated 8000 working hours and cleaning cutting fluid residue and surface dust every half year to maintain original heat dissipation performance of motor casing. Arbitrary modification on exclusive DKGFU encoder pin definition and internal brake wiring layout will cause unexpected motor out-of-control rotation and permanent servo drive locking malfunction.
8. Typical Application Scope
This brake-equipped small-size AC servo motor is mainly used for automatic indexing turret driving of compact precision CNC lathes produced by Tsugami, Miyano and other Japanese precision machinery manufacturers, widely installed on miniature parts automatic turning production lines and precision component processing workshops. It is specially applicable for compact turret installation space demanding frequent station switching, high repeated positioning accuracy and mandatory anti-displacement protection under sudden power cut conditions.
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