UAASK-15EHS12 AC Spindle Motor Product Specification
UAASK-15EHS12 is a high-performance three-phase AC spindle motor manufactured by Yaskawa Electric, belonging to the classic UAASK spindle motor series specially developed for CNC machine tool main spindle driving scenarios. This unit is engineered to realize wide constant-power speed regulation, stable high-torque output at low rotation speed and ultra-high-speed stable running, which fits mainstream vertical machining centers, CNC lathes, milling equipment and special precision cutting machinery as core spindle drive component. Adopting rare-earth permanent magnet rotor and high-density laminated stator core structure, the motor achieves high operation efficiency, low vibration and low running noise under continuous heavy cutting load, and supports frequent start-stop, forward-reverse switching and variable-load intermittent processing working conditions common in machine tool production lines. Equipped with external forced air cooling structure matching the series design standard, the motor maintains stable heat dissipation under long-duration overload operation; the EHS12 suffix represents customized factory configuration including dedicated serial feedback encoder, exclusive terminal wiring definition and customized output shaft mechanical size, making this specification a non-universal customized variant of the standard UAASK 15 frame series. This motor model has been phased out of original mass production, and available market products mainly include brand-new surplus inventory and professionally refurbished tested spare motors for equipment maintenance replacement.
Description
UAASK-15EHS12 AC Spindle Motor Product Specification
1. Product Overview
UAASK-15EHS12 is a high-performance three-phase AC spindle motor manufactured by Yaskawa Electric, belonging to the classic UAASK spindle motor series specially developed for CNC machine tool main spindle driving scenarios. This unit is engineered to realize wide constant-power speed regulation, stable high-torque output at low rotation speed and ultra-high-speed stable running, which fits mainstream vertical machining centers, CNC lathes, milling equipment and special precision cutting machinery as core spindle drive component. Adopting rare-earth permanent magnet rotor and high-density laminated stator core structure, the motor achieves high operation efficiency, low vibration and low running noise under continuous heavy cutting load, and supports frequent start-stop, forward-reverse switching and variable-load intermittent processing working conditions common in machine tool production lines. Equipped with external forced air cooling structure matching the series design standard, the motor maintains stable heat dissipation under long-duration overload operation; the EHS12 suffix represents customized factory configuration including dedicated serial feedback encoder, exclusive terminal wiring definition and customized output shaft mechanical size, making this specification a non-universal customized variant of the standard UAASK 15 frame series. This motor model has been phased out of original mass production, and available market products mainly include brand-new surplus inventory and professionally refurbished tested spare motors for equipment maintenance replacement.
2. Model Coding Explanation
The UAASK prefix stands for Yaskawa standard external cooling AC spindle motor product code, where UA marks AC spindle motor classification, K refers to external fan forced cooling mode, A represents single-winding internal stator structure design of the motor. The numerical digit 15 corresponds to the frame size and rated continuous power grade at 11kW rated output power under standard S3 intermittent working system. Letter E indicates the motor is designed for three-phase 400VAC industrial input power specification instead of conventional 200VAC standard voltage version. HS stands for high-precision serial type encoder configuration for closed-loop speed and position feedback; the last two digits 12 define flange installation specification and output shaft dimensional customization parameters, including standard keyway shaft structure and specific flange mounting hole layout, which cannot be directly interchanged with other same-frame UAASK series motors without mechanical modification and drive parameter readjustment.
3. Core Electrical Parameters
This spindle motor supports three-phase 400VAC nominal power input and must be matched with Yaskawa dedicated VS series spindle servo driver to complete full digital vector closed-loop control system setup. Its continuous rated output power reaches 11kW, with rated working current matching the design load of high-power spindle drive circuit, and the motor can output up to 2.5 times peak overload torque to cope with instantaneous cutting impact load during rough machining process. The built-in high-resolution serial encoder of HS configuration transmits real-time rotation speed and angular position differential serial signals to the matched driver, realizing high-precision spindle positioning, rigid tapping and constant surface speed cutting functions required by CNC machining. Stator winding adopts Class F insulation standard with built-in embedded thermal protection sensing elements; once internal winding overtemperature caused by abnormal overload occurs, the matched drive system receives temperature alarm signal and automatically executes derating operation or shutdown protection to avoid winding burnout damage. Internal circuit is integrated with surge absorption components to restrain voltage spike and electromagnetic interference generated by industrial frequency conversion cabinet and peripheral switching equipment, improving operation stability under complex factory power supply environment.
4. Mechanical Structure & Environmental Adaptability
The motor body adopts integral cast aluminum alloy housing with IP54 overall protection grade for dustproof and splash-proof performance, paired with external independent cooling fan assembly for forced air heat dissipation, which effectively improves continuous heavy-load heat dissipation capacity compared with natural cooling spindle motors. Front end features solid integral output shaft with standard flat keyway for rigid connection with spindle gearbox, synchronous belt wheel or direct-coupling spindle structure; the rear end reserves dedicated aviation connector installation position for power winding wiring and encoder signal line connection, with fixed wiring direction defined by factory customized 12 specification code. Standard flange mounting mode is adopted for equipment assembly, convenient for direct bolt locking on machine tool spindle box without extra transition fixture processing.
The allowable continuous operating ambient temperature ranges from 0°C to +40°C, and the storage temperature scope is -20°C to +70°C; applicable working environment humidity keeps between 5%RH and 80%RH under non-condensing state to prevent internal metal part corrosion and circuit short circuit failure. When installation altitude exceeds 1000 meters above sea level, users need to properly reduce the motor’s continuous operating load to compensate for weakened air heat dissipation efficiency at high altitude. The motor can resist regular industrial vibration within 10Hz to 55Hz frequency band, and is prohibited to be deployed in working environment with corrosive gas, oil mist accumulation and excessive metal dust to extend service life of internal bearing and winding components.
5. Main Application Scope & Product Maintenance Tips
UAASK-15EHS12 is primarily used as main spindle driving unit for medium and large CNC machining centers, heavy-duty CNC turning and milling composite machines, mold processing special machine tools and automated production line fixed cutting equipment, suitable for steel, cast iron, aluminum alloy and other metal rough and finish cutting processing scenarios. During daily maintenance, users need to regularly clean the external cooling fan filter screen to avoid dust blockage leading to poor heat dissipation and motor overheating alarm; periodic inspection of output shaft bearing lubrication and connector wiring tightness is required to prevent oil leakage and loose wiring faults. For equipment maintenance replacement, the matched original serial encoder and dedicated power cable must be adopted; non-matching replacement parts will cause feedback signal failure and abnormal spindle runaway operation. Refurbished motors available in aftermarket go through complete winding surge test, high-pot withstand voltage inspection, rotating part dynamic balance calibration and full-load aging test before delivery to meet original factory performance standard requirements.
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