UAASKD-11EHS11 AC Spindle Motor Product Specification
UAASKD-11EHS11 is a heavy-duty externally forced air-cooled permanent magnet AC spindle motor produced by Yaskawa Electric, belonging to the mature UAASK series specially developed for medium-large vertical machining centers, heavy-duty CNC turning centers, precision mold processing machines and customized automated cutting equipment. The motor is built with high-density laminated silicon steel stator core and high-performance rare-earth permanent magnet rotor, featuring wide constant-power speed regulation range, stable low-speed high-torque output and low-vibration high-speed steady operation. It can reliably withstand frequent forward-reverse rotation, intermittent heavy rough cutting load and long-cycle continuous finish machining under various metal processing conditions. Equipped with an independent external cooling fan assembly, the spindle maintains outstanding heat dissipation efficiency under sustained full-load operation and effectively prevents unexpected overheat protection shutdown caused by long-time heavy cutting. The suffix EHS11 represents exclusive factory customized configuration including 400V three-phase rated input specification, high-precision serial feedback encoder and tailor-made dimensions for output shaft and mounting flange. This customized variant cannot be directly interchanged with standard 11-frame general spindle motors without mechanical modification and full servo drive parameter recalibration. Original formal mass production of this model has been discontinued, and available products on the market mainly consist of surplus original unused stock and professionally refurbished motors that pass complete factory-standard aging inspection for equipment maintenance replacement.
Description
UAASKD-11EHS11 AC Spindle Motor Product Specification
1. Product Overview
UAASKD-11EHS11 is a heavy-duty externally forced air-cooled permanent magnet AC spindle motor produced by Yaskawa Electric, belonging to the mature UAASK series specially developed for medium-large vertical machining centers, heavy-duty CNC turning centers, precision mold processing machines and customized automated cutting equipment. The motor is built with high-density laminated silicon steel stator core and high-performance rare-earth permanent magnet rotor, featuring wide constant-power speed regulation range, stable low-speed high-torque output and low-vibration high-speed steady operation. It can reliably withstand frequent forward-reverse rotation, intermittent heavy rough cutting load and long-cycle continuous finish machining under various metal processing conditions. Equipped with an independent external cooling fan assembly, the spindle maintains outstanding heat dissipation efficiency under sustained full-load operation and effectively prevents unexpected overheat protection shutdown caused by long-time heavy cutting. The suffix EHS11 represents exclusive factory customized configuration including 400V three-phase rated input specification, high-precision serial feedback encoder and tailor-made dimensions for output shaft and mounting flange. This customized variant cannot be directly interchanged with standard 11-frame general spindle motors without mechanical modification and full servo drive parameter recalibration. Original formal mass production of this model has been discontinued, and available products on the market mainly consist of surplus original unused stock and professionally refurbished motors that pass complete factory-standard aging inspection for equipment maintenance replacement.
2. Model Code Definition
UAASKD is the base series code of Yaskawa external fan-cooled AC spindle motor, where UA stands for AC spindle classification, K refers to external forced air cooling mode, and the letter D represents reinforced heavy-load optimized internal stator structure design. The numeric mark 11 corresponds to medium-large frame size with S3 intermittent rated continuous power of 11kW and stable continuous power output under standard operating duty. Letter E indicates three-phase 400VAC industrial rated input voltage different from conventional 200V standard winding specification; H stands for high-resolution feedback component grade, and S means serial digital encoder configuration instead of traditional incremental pulse feedback to improve spindle positioning precision. The last two digits 11 define exclusive OEM customized parameters covering dedicated output shaft dimension and keyway size, unique flange mounting hole layout and fixed pin assignment of aviation connectors for power and encoder signal wiring, forming an independent customized specification separate from other regular 11-frame spindle products.
3. Electrical Performance Specification
This spindle motor is designed for three-phase 400VAC industrial power input and must be matched with original Yaskawa dedicated spindle servo drive to construct full digital vector closed-loop speed and position control system. Its intermittent rated output power reaches 11kW with corresponding rated operating current matching heavy cutting load requirement, and the motor can deliver up to 2.8 times instantaneous peak overload torque to absorb transient impact load generated during rough machining of cast iron, carbon steel and thick aluminum alloy blanks. The built-in high-resolution serial encoder defined by HS coding transmits real-time rotational speed and angular position digital serial signals to paired driver unit, supporting core CNC functions including 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 thermal sensing components; once abnormal overload triggers winding overtemperature, the matched drive receives temperature alarm signal and automatically executes output derating or protective shutdown to prevent permanent winding burnout damage. Internal wiring circuit is equipped with surge suppression components to restrain voltage spike and industrial electromagnetic interference generated by peripheral frequency converters and switching power devices, improving operational stability under complicated factory power grid fluctuation environment.
4. Mechanical Structure and Environmental Requirements
The motor main body adopts integrated cast aluminum alloy housing with IP54 standard dustproof and anti-splash protection grade, matched with separated external cooling fan assembly for forced convection heat dissipation, greatly lifting continuous heavy-load heat dissipation capability compared with natural cooling spindle motors. Front end is 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 components; rear casing reserves fixed installation position for EHS11 customized aviation plugs for power cable and encoder signal wiring following exclusive factory pin definition rules. Standard flange mounting design is adopted for equipment assembly to realize direct bolt fastening on machine spindle box without additional transition fixture processing.
Permissible continuous working ambient temperature ranges from 0°C to +40°C, and storage temperature scope is between -20°C and +70°C; applicable working environment humidity keeps 5%RH to 80%RH under non-condensing state to avoid internal metal corrosion and circuit short-circuit failure. When installation altitude exceeds 1000 meters above sea level, users need to properly reduce continuous working load to compensate declined heat dissipation efficiency caused by reduced air density at high altitude. The motor can resist regular industrial vibration within 10Hz to 55Hz frequency range, and installation in sites with corrosive gas, accumulated oil mist and conductive metal scrap is strictly prohibited to extend service life of internal bearing, winding and precision serial encoder components.
5. Application Range and Routine Maintenance Guidance
UAASKD-11EHS11 is widely used as core spindle driving component for medium-large vertical machining centers, heavy-duty CNC turning centers, large mold engraving and milling machines 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 parts. During daily maintenance, operators need regular cleaning of external cooling fan filter screen to eliminate dust blockage leading to poor heat dissipation and over-temperature protection alarm; periodic inspection of output shaft bearing lubrication status and aviation connector wiring tightness is required to prevent oil leakage and loose wiring-induced abnormal spindle speed fluctuation. For equipment breakdown replacement maintenance, original matching serial encoder and exclusive EHS11 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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