UAASKD-15WHS12 AC Spindle Motor Product Specification
UAASKD-15WHS12 is a heavy-duty external forced-air cooled permanent magnet AC spindle motor manufactured by Yaskawa Electric, belonging to the mature UAASKD spindle series engineered for large vertical machining centers, heavy-duty CNC lathes, large mold processing machines and customized automated metal-cutting production equipment. Constructed with high-density laminated silicon steel stator core and high-performance rare-earth permanent magnet rotor, this spindle motor features a wide constant-power speed regulation range, stable high low-speed torque output and low-vibration high-speed continuous running performance. It is capable of enduring frequent forward-reverse rotation, long-period continuous heavy rough cutting and precision finish machining under varying load conditions. Equipped with an independent external cooling fan assembly, the motor achieves reliable forced convection heat dissipation and effectively avoids unexpected overheat protection shutdown during sustained heavy-load cutting operations. The suffix WHS12 represents exclusive factory-customized configuration covering wide adaptive voltage winding design, high-resolution serial feedback encoder and tailor-made mechanical dimensions for output shaft and mounting flange. This dedicated customized variant cannot be directly replaced by standard 15-frame generic spindle motors without mechanical modification and full servo drive parameter recalibration. Original volume production of this model has been discontinued, and available market resources mainly include leftover original new inventory and professionally refurbished units that pass complete factory-standard aging and performance testing for equipment maintenance replacement.
Description
UAASKD-15WHS12 AC Spindle Motor Product Specification
1. Product Overview
UAASKD-15WHS12 is a heavy-duty external forced-air cooled permanent magnet AC spindle motor manufactured by Yaskawa Electric, belonging to the mature UAASKD spindle series engineered for large vertical machining centers, heavy-duty CNC lathes, large mold processing machines and customized automated metal-cutting production equipment. Constructed with high-density laminated silicon steel stator core and high-performance rare-earth permanent magnet rotor, this spindle motor features a wide constant-power speed regulation range, stable high low-speed torque output and low-vibration high-speed continuous running performance. It is capable of enduring frequent forward-reverse rotation, long-period continuous heavy rough cutting and precision finish machining under varying load conditions. Equipped with an independent external cooling fan assembly, the motor achieves reliable forced convection heat dissipation and effectively avoids unexpected overheat protection shutdown during sustained heavy-load cutting operations. The suffix WHS12 represents exclusive factory-customized configuration covering wide adaptive voltage winding design, high-resolution serial feedback encoder and tailor-made mechanical dimensions for output shaft and mounting flange. This dedicated customized variant cannot be directly replaced by standard 15-frame generic spindle motors without mechanical modification and full servo drive parameter recalibration. Original volume production of this model has been discontinued, and available market resources mainly include leftover original new inventory and professionally refurbished units that pass complete factory-standard aging and performance testing for equipment maintenance replacement.
2. Model Code Definition
UAASKD serves as the base series identifier of Yaskawa external fan-cooled AC spindle motor. UA stands for AC spindle product classification, K denotes external forced air cooling structure, and the letter D refers to reinforced heavy-load optimized stator internal layout for heavy cutting application. The numeric digit 15 corresponds to large frame size with S3 intermittent rated output power of 15kW as the core power specification of this model. Letter W indicates wide-range adaptive input winding different from fixed single standard voltage versions; H represents high-precision grade of feedback sensing parts; S stands for serial digital encoder instead of conventional incremental pulse feedback to upgrade spindle positioning accuracy. The last two digits 12 define exclusive OEM customized mechanical parameters including dedicated output shaft dimension with standard flat keyway, unique flange mounting hole layout and fixed pin assignment of aviation connectors for power wiring and encoder signal transmission, forming an independent customized specification differentiated from other regular 15-frame spindle products.
3. Electrical Performance Specification
This spindle motor adopts wide three-phase AC input design and must be matched with original Yaskawa dedicated spindle servo driver to build complete full-digital vector closed-loop speed and position control system. Its intermittent rated output power reaches 15kW under S3 intermittent working duty, with corresponding rated working current complying with heavy-load cutting requirement, and the motor can deliver up to 3 times instantaneous peak overload torque to absorb transient impact load generated during rough machining of cast iron, carbon steel and thick alloy blanks. The built-in high-resolution serial encoder defined by HS coding transmits real-time rotating speed and angular position serial digital signals to paired servo drive unit, realizing core CNC functions such as rigid tapping, fixed spindle orientation positioning and constant peripheral speed cutting required for high-precision mold and heavy metal component processing. Stator winding complies with Class F insulation standard with embedded built-in thermal sensing elements; once abnormal continuous overload causes winding overtemperature, the matched driver receives temperature alarm signal and automatically executes output derating or protective power-off to prevent permanent winding burnout damage. Internal circuit integrates surge suppression components to restrain voltage spike and electromagnetic interference triggered by peripheral inverters and switching power supplies, stabilizing motor operation under complex fluctuating factory power grid environment.
4. Mechanical Structure and Environmental Adaptation Requirements
The motor main housing is made of integrated cast aluminum alloy with IP54 dustproof and splash-proof protection grade, cooperating with separated external cooling fan module for forced air heat dissipation to obtain superior continuous heavy-load thermal management capacity compared with natural cooling spindle motors. Front end is fitted with solid integral output shaft with customized flat keyway for rigid connection with large synchronous belt pulley, heavy-duty reduction gearbox or direct-coupled machine tool spindle assemblies; rear casing reserves fixed installation position for WHS12 customized aviation plugs for power cable and encoder signal wiring following exclusive factory pin definition rules. Standard flange mounting structure is adopted for equipment assembly to realize direct bolt fastening on machine spindle box without additional transition fixture processing.
Permitted continuous operating ambient temperature ranges from 0°C to +40°C, and storage temperature scope covers -20°C to +70°C; applicable working environment humidity maintains 5%RH to 80%RH under non-condensing state to avoid internal metal corrosion and circuit short-circuit faults. When installation altitude exceeds 1000 meters above sea level, users need to appropriately reduce continuous working load to compensate declined heat dissipation efficiency caused by thinner air density at high altitude. The motor can withstand regular industrial vibration within 10Hz~55Hz frequency band, while deployment in working sites with corrosive gas, accumulated oil mist and conductive metal dust is strictly prohibited to extend service life of internal bearing, stator winding and precision serial encoder components.
5. Application Scope and Routine Maintenance Guidance
UAASKD-15WHS12 is widely configured as core spindle driving component for large vertical machining centers, heavy-duty CNC turning centers, oversized mold engraving & milling equipment and fixed heavy cutting stations on automated production lines, applicable to rough and finish machining of ferrous metal, thick non-ferrous alloy and high-hardness engineering plastic workpieces. During daily maintenance, operators need regular cleaning on external cooling fan filter screen to eliminate dust blockage which would trigger poor heat dissipation and unexpected over-temperature protection alarm; periodic inspection on output shaft bearing lubrication condition and aviation connector wiring tightness is required to avoid bearing oil leakage and loose connection induced abnormal spindle speed fluctuation. For equipment breakdown replacement maintenance, original matching serial encoder and exclusive WHS12 specification dedicated power cables must be selected; mismatched replacement accessories will result in invalid feedback signal and out-of-control spindle runaway operation. After professional refurbishment, aftermarket spare motors will complete winding high-pot withstand voltage test, rotating part dynamic balance calibration and full-load continuous aging test in accordance with original factory technical standards before delivery to guarantee consistent performance parameters with brand-new original products.
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