YASKAWA UAJPEE-15DK2TU AC Servo Motor Specification

UAJPEE-15DK2TU belongs to Yaskawa UAJPE series AC servo motor specially developed for automatic turret driving on small-sized precision CNC lathes. This model adopts conventional laminated iron-core stator and rotor structure optimized for low-speed high-torque output, frequent forward-reverse rotation and high-precision indexing positioning required by tool turret mechanical movement. The whole unit features fully enclosed IP54-rated housing with passive natural convection cooling design without auxiliary cooling fan. Different from brake-free variants, this motor is equipped with integrated built-in electromagnetic power-off holding brake to lock output shaft reliably once auxiliary brake power is disconnected, effectively preventing accidental turret position shift under unexpected power failure. DK2TU is factory-customized specification code representing exclusive incremental encoder parameters, dedicated rear connector pin assignment, fixed internal wiring layout and customized output shaft dimensional tolerance, which cannot be directly interchanged with other DK-series suffix variants of the same frame size. The product has been phased out from original regular production, and available spare parts mainly come from used dismantled units and professionally refurbished inventory from retired machine tools.

UAJPEE is the base serial code of UAJPE-series AC servo motor integrated with built-in electromagnetic holding brake; numeric mark 15 stands for standard small frame dimension corresponding to rated continuous output power of 0.55kW. Letter D denotes embedded incremental rotary encoder for closed-loop position feedback; K represents rear aviation multi-pin integrated connector type instead of loose flying lead wiring; numeral 2 defines factory base wiring standard and internal terminal layout; suffix TU indicates non-standard customized specification covering encoder resolution, shaft machining tolerance and exclusive harness configuration set by original OEM production requirement. Owing to unique connector pinout and internal circuit arrangement, cross replacement with DK2TA, DK2TB and other same-frame derivative models needs complete connector rewiring and full servo drive parameter recalibration after field installation.

The servo motor is rated for standard three-phase 200V AC industrial input voltage and must be matched with original dedicated Yaskawa servo drive designed for CNC turret control system. Continuous rated output power is 550W with corresponding rated operating current under full-load nominal working condition and fixed rated base speed configured for regular turret indexing cycle. Instantaneous peak overload torque can reach up to three times rated torque to withstand transient impact load during turret tool clamping and emergency positioning action. The integrated DC-powered holding brake requires independent 24VDC auxiliary control supply; brake releases output shaft when energized for normal motor rotation and mechanically locks shaft instantly upon auxiliary power cutoff to fix turret position securely. The onboard DK2TU differential incremental encoder follows proprietary factory wiring definition and signal specification, any mismatch of connector pin assignment will lead to loss of closed-loop feedback and abnormal out-of-control rotation. Internal stator winding is produced in accordance with Class F insulation standard, fitted with embedded thermal sensing element that feeds overheat fault signal to paired servo amplifier to trigger automatic overload shutdown and avoid winding overheat burnout. Surge suppression components are pre-installed inside internal wiring compartment to restrain transient voltage spike and electromagnetic interference generated by surrounding inverters and switching power devices inside machine control cabinet.

The fully sealed motor housing meets IP54 dust and splash-proof ingress protection grade and realizes heat dissipation entirely via shell natural convection without additional cooling fan. Front drive end is standard solid output shaft with integrated flat keyway for rigid connection with turret intermediate reduction gear and transmission assembly. Benefiting from rear-mounted built-in brake module, overall axial length is longer than non-brake UAJPEA same-frame versions, with unified standard small flange mounting dimension enabling direct bolt fixation onto turret housing without extra transition fixture.

Valid continuous working ambient temperature ranges from 0°C to +40°C; permissible long-term spare part storage temperature spans -20°C to +70°C; applicable working relative humidity is kept between 5%RH and 80%RH under non-condensing environment to avoid dew-induced internal short-circuit damage of winding, brake coil and encoder circuit. When installation altitude exceeds 1000 meters above sea level, continuous running rated load should be properly derated to compensate decreased heat dissipation efficiency under thin air environment. The motor can endure standard industrial vibration within 10Hz to 55Hz frequency range; installation sites with persistent cutting fluid splash, corrosive oil mist and accumulated conductive metal dust are prohibited to prolong service life of front bearing, brake friction plate and internal encoder components.

UAJPEE-15DK2TU is originally compatible with Yaskawa dedicated vintage turret-specific AC servo drivers, supporting two mainstream command input modes including ±10VDC analog speed instruction and differential pulse position command transmitted from upper CNC host controller of lathe equipment. The matched servo control system supports free switching between position closed-loop control and speed closed-loop control to satisfy fast turret station indexing, accurate angular positioning and tool clamping locking requirements of precision turning process. Thanks to factory pre-installed power-off brake, inclined or vertically arranged turret structures no longer rely on extra external mechanical locking structure to prevent accidental turret drift after sudden power cut. As DK2TU belongs to incremental feedback encoder without absolute position memory function, complete mechanical origin homing operation must be executed after full system power outage before automatic turret indexing starts to recover accurate mechanical zero reference point.

Multi-layer comprehensive safety protection is realized through coordination between internal embedded sensing parts and paired servo amplifier. Winding over-temperature feedback signal triggers automatic servo shutdown to protect stator winding against permanent thermal damage; open-circuit or poor contact of customized DK2TU encoder connector activates independent encoder malfunction warning displayed on servo operation panel; winding short-circuit and abnormal overcurrent trigger hardware overcurrent protection with immediate main power cutoff; open or short fault of built-in brake coil outputs auxiliary fault prompt via drive external terminal port. All encoder feedback signal circuits are equipped with noise filtering components to filter complex electromagnetic interference from surrounding machine tool circuits and guarantee stable real-time position signal transmission.

Direct field replacement requires identical original UAJPEE-15DK2TU spare motor; non-brake UAJPEA variant or same-frame motor with different DK suffix specification cannot be directly substituted unless full connector rewiring and complete servo parameter reset and commissioning are finished post installation. Before disassembling motor for bearing inspection, brake friction disc maintenance or encoder overhaul, maintenance personnel must fully disconnect three-phase main AC power and independent 24VDC brake auxiliary power, 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. Regular maintenance items include 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 and casing dust every half year to retain original heat dissipation performance. Random modification to exclusive DK2TU encoder pin definition and internal brake wiring layout will result in unexpected motor runaway and permanent servo drive locking fault.

This brake-equipped small-frame AC servo motor is mainly applied for automatic tool turret drive of small precision CNC lathes from multiple Japanese equipment brands, widely deployed in precision component processing workshops and miniature parts automated turning production lines. It is especially suitable for compact turret installation space with frequent station switching, high repeated positioning precision and mandatory anti-shift protection after unexpected power failure.