June 05, 2026

YASKAWA UAJPEE-22DK2TU AC Servo Motor Specification

UAJPEE-22DK2TU is a brake-equipped AC servo motor from Yaskawa UAJPE series, purpose-built to drive automatic tool turrets on medium-sized precision CNC lathes. Designed with conventional laminated iron-core stator and rotor structure, this motor is optimized to deliver stable low-speed high-torque output, withstand frequent forward and reverse rotation, and maintain high-precision angular indexing for turret station switching and mechanical clamping operations. The unit adopts fully enclosed IP54-rated housing with passive natural convection cooling and no auxiliary cooling fan fitted. As denoted by the E suffix in model code, an integrated DC24V electromagnetic power-off holding brake is installed at the rear to lock the output shaft mechanically once brake power is interrupted, effectively preventing unwanted turret position shift during unexpected power loss. DK2TU stands for factory-customized specification including exclusive incremental encoder parameters, dedicated rear multi-pin aviation connector pin assignment, fixed internal wiring layout and customized output shaft dimensional tolerance, making it non-interchangeable with other DK suffix variants of the same frame size without full wiring rework and servo parameter recalibration. Original series production has been discontinued by Yaskawa, and available spare units on the market are sourced primarily from dismantled used equipment and professionally refurbished motors salvaged from retired CNC lathes.

Description

YASKAWA UAJPEE-22DK2TU AC Servo Motor Specification

1. Product Overview

2. Model Code Definition

UAJPEE is the base series designation for UAJPE AC servo motors equipped with built-in electromagnetic holding brake; numeric code 22 represents medium frame dimension corresponding to 750W rated continuous output power. Letter D confirms integrated built-in incremental rotary encoder for closed-loop position feedback; K indicates rear-end integrated aviation multi-pin plug connection instead of loose flying lead cabling; numeral 2 defines the factory standard base wiring layout and internal terminal arrangement; suffix TU covers OEM customized details such as encoder resolution, customized shaft machining tolerance and exclusive internal harness configuration. Owing to unique connector pinout and internal circuit design, direct drop-in replacement with DK2TA, DK2FB or other same-frame derivative models is not feasible unless complete connector rewiring and full servo drive parameter reset are accomplished after field installation.

3. Electrical Specifications

The motor is specified for standard three-phase 200V AC industrial input voltage and must be paired with original dedicated vintage Yaskawa servo drives developed exclusively for CNC turret control systems. Continuous rated output power is fixed at 750W with corresponding rated full-load operating current and factory-set rated base speed matching regular medium-size turret indexing cycle requirements. Instantaneous peak overload torque can reach three times the rated torque to absorb transient impact loads generated during turret tool clamping and emergency positioning actions. The built-in holding brake relies on independent 24VDC auxiliary power supply; brake energization releases the shaft for normal motor rotation, while power cutoff triggers instant mechanical shaft locking to secure turret position reliably. The onboard DK2TU incremental encoder follows proprietary factory signal definition and pin assignment, and mismatched wiring will lead to lost closed-loop feedback and uncontrolled motor spinning. Internal stator winding complies with Class F insulation standard and is fitted with embedded thermal sensing component that transmits overheat fault signals to the matched servo amplifier to initiate automatic overload shutdown and avoid winding burnout from excessive temperature. Surge suppression components are preinstalled inside the internal wiring cavity to suppress industrial voltage spikes and electromagnetic interference from surrounding inverters and switching power devices inside machine control cabinets.

4. Mechanical and Environmental Specifications

The fully sealed motor housing achieves IP54 dust and splash protection and dissipates heat entirely via shell natural convection without additional cooling fan structure. Front drive end features standard solid output shaft with integrated flat keyway for rigid mechanical coupling with turret intermediate reduction gears and transmission assemblies. Due to the rear-mounted brake module, overall axial length exceeds that of non-brake UAJPEA motors of the same 22 frame, while unified standard flange mounting dimensions allow direct bolt-on installation onto turret housings without extra transition fixtures.

Valid continuous operating 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 maintained between 5%RH and 80%RH under non-condensing operating conditions to prevent dew-caused short-circuit damage to stator winding, brake coil and encoder internal circuits. When installation altitude goes beyond 1000 meters above sea level, continuous rated operating load must be appropriately derated to offset reduced heat dissipation efficiency under low air density. The motor can withstand standard industrial vibration ranging from 10Hz to 55Hz; installation sites with persistent cutting fluid splashes, corrosive oil mist and accumulated conductive metal dust are prohibited to extend service life of front bearing, brake friction pads and rear encoder components.

5. Drive Matching and Control Functions

UAJPEE-22DK2TU is originally compatible with dedicated Yaskawa vintage turret-specific AC servo drivers, supporting two mainstream command input types including ±10VDC analog speed instruction and differential pulse position command transmitted from upper-level CNC lathe host controller. The matched servo control system supports flexible switching between position closed-loop control and speed closed-loop control to fulfill rapid turret station indexing, high-precision positioning and heavy-load clamping required by precision turning processes. Benefiting from the factory pre-installed power-off brake, inclined or vertically arranged turret structures no longer need additional external mechanical locking devices to prevent accidental turret drifting after sudden power failure. Since the equipped DK2TU incremental encoder lacks absolute position memory capability, full mechanical origin homing procedure must be completed after every full system power cut before automatic turret indexing resumes to restore accurate mechanical zero reference point.

6. Protection and Fault Alarm Description

Multi-layer comprehensive safety protection is realized through cooperation between internal embedded sensing elements and matched servo amplifier. Winding over-temperature signal triggers automatic servo shutdown to protect stator winding against permanent thermal damage; open circuit or poor contact of DK2TU dedicated encoder connector activates independent encoder fault warning displayed on the servo operation panel; winding short-circuit and abnormal overcurrent trigger hardware overcurrent protection with immediate main power cutoff; 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 noise filtering components to filter complex electromagnetic interference from surrounding machine tool circuits and ensure stable real-time position signal transmission during long-cycle continuous production runs.

7. Maintenance and Replacement Guidance

Direct on-site equipment replacement requires identical original UAJPEE-22DK2TU spare motor; non-brake UAJPEA variant or same-frame motors with different DK suffix specifications cannot be directly substituted unless full connector rewiring and complete servo parameter reset plus on-site commissioning are finished after installation. Before disassembling the motor for bearing inspection, brake friction plate maintenance or encoder overhaul work, 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 avoid electric shock hazards. Routine 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 natural 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.

8. Typical Application Scope

This brake-equipped medium-frame AC servo motor is widely adopted to drive automatic indexing turrets on medium-size precision CNC lathes from Mazak, Tsugami, Miyano and other well-known Japanese machine tool brands, extensively deployed in precision component processing workshops and automatic turning production lines. It is especially suitable for turret mechanical layouts with moderate installation space, frequent station conversion, high repeated positioning accuracy and strict anti-displacement requirement upon unexpected power outage.

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