UAASKA-11FKI11 AC Spindle Motor Product Specification
UAASKA-11FKI11 is a three-phase external forced-air cooled permanent magnet AC spindle motor developed and manufactured by Yaskawa Electric Japan, belonging to the mature UAASKA spindle motor series targeted for heavy-duty vertical machining centers, large CNC lathes, precision mold machining equipment and customized automated cutting production lines. Constructed with high-density laminated silicon steel stator core and optimized rare-earth permanent magnet rotor structure, this medium-large frame spindle features wide constant-power speed regulation range, robust low-speed high-torque output and low-vibration stable high-speed continuous operation to cope with intensive rough cutting, high-precision finish machining and frequent forward-reverse cyclic startup & shutdown under heavy metal cutting loads. Equipped with an independent external cooling fan assembly, the unit maintains efficient continuous heat dissipation during long-hour full-load operation and prevents unexpected overheat protection shutdown under sustained heavy cutting conditions. The suffix FKI11 stands for exclusive OEM customized factory configuration including standard 200V three-phase winding specification, high-precision serial absolute feedback encoder, reinforced heavy-load bearing set plus custom-defined output shaft, mounting flange dimension and aviation connector pin assignment; this dedicated variant cannot be replaced by standard 11-frame regular spindle motors without mechanical rework and servo drive parameter resetting. Mass original production of this specification has been discontinued, with current available market stock consisting of leftover original new inventory and professionally refurbished motors that complete full factory-standard aging and performance testing for equipment maintenance replacement projects.
Description
UAASKA-11FKI11 AC Spindle Motor Product Specification
1. Product Overview
UAASKA-11FKI11 is a three-phase external forced-air cooled permanent magnet AC spindle motor developed and manufactured by Yaskawa Electric Japan, belonging to the mature UAASKA spindle motor series targeted for heavy-duty vertical machining centers, large CNC lathes, precision mold machining equipment and customized automated cutting production lines. Constructed with high-density laminated silicon steel stator core and optimized rare-earth permanent magnet rotor structure, this medium-large frame spindle features wide constant-power speed regulation range, robust low-speed high-torque output and low-vibration stable high-speed continuous operation to cope with intensive rough cutting, high-precision finish machining and frequent forward-reverse cyclic startup & shutdown under heavy metal cutting loads. Equipped with an independent external cooling fan assembly, the unit maintains efficient continuous heat dissipation during long-hour full-load operation and prevents unexpected overheat protection shutdown under sustained heavy cutting conditions. The suffix FKI11 stands for exclusive OEM customized factory configuration including standard 200V three-phase winding specification, high-precision serial absolute feedback encoder, reinforced heavy-load bearing set plus custom-defined output shaft, mounting flange dimension and aviation connector pin assignment; this dedicated variant cannot be replaced by standard 11-frame regular spindle motors without mechanical rework and servo drive parameter resetting. Mass original production of this specification has been discontinued, with current available market stock consisting of leftover original new inventory and professionally refurbished motors that complete full factory-standard aging and performance testing for equipment maintenance replacement projects.
2. Model Code Explanation
UAASKA serves as the base series designation of Yaskawa externally air-cooled AC spindle motor: UA indicates AC spindle classification, K represents external forced air cooling design, and the final A denotes optimized single-winding internal stator layout. The numeric code 11 corresponds to medium-large frame size, with S3 intermittent rated output power of 11kW and S1 continuous rated power of 7.5kW as core electrical rating of this frame specification. Letter F stands for standard three-phase 200V industrial winding design for conventional domestic industrial power grid; K refers to heavy-duty reinforced bearing configuration engineered to withstand excessive radial and axial cutting impact load during heavy stock removal; I represents built-in high-resolution serial absolute encoder for full digital position feedback control. The last two digits 11 define exclusive customized mechanical parameters including dedicated output shaft dimension with standard flat keyway, unique flange mounting hole layout and fixed pin definition of power and encoder aviation plugs, forming an independent customized specification different from all other standard 11-frame spindle variants.
3. Core Electrical Specifications
This spindle motor is designed for three-phase 200VAC industrial power input and must be matched with original Yaskawa dedicated spindle servo driver to realize full digital vector closed-loop speed and position control system. Its continuous rated output power reaches 7.5kW while intermittent S3 duty rated power hits 11kW under rated working current for regular heavy cutting load, and the motor can deliver up to 3.0 times instantaneous peak overload torque to absorb transient cutting shock during rough machining of cast iron, medium carbon steel and thick aluminum alloy blanks. The built-in I-type high-precision serial absolute encoder defined by model coding transmits real-time rotational speed and absolute angular position serial digital signals to paired servo drive unit, enabling essential CNC core functions such as rigid tapping, spindle fixed orientation positioning and constant peripheral speed cutting required for high-precision mold and metal component processing. Stator winding complies with Class F insulation standard with embedded built-in thermal sensing elements; once continuous overload triggers winding over-temperature, the matched drive receives temperature alarm signal and automatically activates output derating or power-off protection to avoid winding burnout damage. Internal wiring circuit integrates surge suppression components to restrain voltage spike and electromagnetic interference induced by peripheral inverter and switching equipment, securing stable running performance under fluctuating factory power supply environment.
4. Mechanical Structure and Environmental Application Requirements
The motor main housing adopts integrated cast aluminum alloy construction with IP54 dustproof and splash-proof protection grade, cooperating with separated external cooling fan module for forced convection heat dissipation to achieve superior continuous heavy-load thermal management performance versus natural cooling spindle motors. Front end is fitted with solid integral output shaft with standard flat keyway for rigid connection with large-size synchronous belt pulley, reduction gearbox or direct-coupled machine tool spindle assemblies; rear casing reserves fixed installation position for FKI11 customized aviation plugs following exclusive pin assignment for power cable and encoder signal wiring. Standard flange mounting structure is adopted for equipment assembly to achieve direct bolt fastening on machine spindle box without additional transition fixture machining.
Permitted continuous operating ambient temperature ranges from 0°C to +40°C, while permissible storage temperature spans -20°C to +70°C; applicable working environment humidity is maintained between 5%RH and 80%RH under non-condensing condition to prevent internal metal component corrosion and circuit short-circuit faults. If installation altitude exceeds 1000 meters above sea level, users need to properly reduce continuous working load to offset degraded heat dissipation efficiency caused by thinner high-altitude air density. The motor can bear conventional industrial vibration within 10Hz~55Hz frequency band; installation and operation in sites filled with corrosive gas, dense oil mist and conductive metal dust is strictly forbidden to extend service lifespan of internal bearing, stator winding and precision serial encoder components.
5. Application Range and Routine Maintenance Guidelines
UAASKA-11FKI11 is widely deployed as core spindle driving unit for heavy-duty vertical machining centers, large precision CNC lathes, large-scale mold engraving & milling equipment and fixed heavy cutting stations on automated production lines, suitable for rough and finish machining of ferrous metal, thick non-ferrous alloy and high-strength engineering plastic workpieces. During daily routine maintenance, operators need regular cleaning on external cooling fan filter screen to eliminate dust blockage which would lead to poor heat dissipation and unexpected over-temperature protection alarm; periodic inspection of output shaft bearing lubrication condition and aviation connector wiring tightness is required to avoid bearing oil leakage and loose wiring induced abnormal spindle speed fluctuation. For equipment breakdown replacement maintenance, original matching serial absolute encoder and exclusive FKI11 specification dedicated power cables must be selected; mismatched replacement accessories will cause invalid position feedback signal and out-of-control spindle runaway failure. After professional refurbishment, aftermarket spare motors will pass winding high-pot withstand voltage test, rotating part dynamic balance calibration and full-load continuous aging test per original factory technical standards before delivery to guarantee consistent performance parameters matching brand-new original products.
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