UAASKA-08EMK21 AC Spindle Motor Product Specification
UAASKA-08EMK21 is a three-phase externally fan-cooled permanent magnet AC spindle motor manufactured by Yaskawa Electric from Japan, belonging to the mature UAASKA spindle series designed for medium-sized vertical machining centers, heavy-duty CNC lathes, precision mold milling equipment and special automated cutting machinery. Adopting high-density laminated silicon steel stator core and optimized rare-earth permanent magnet rotor structure, this spindle unit features wide constant-power speed regulation range, stable high low-speed torque output and low-vibration high-speed continuous running performance to satisfy heavy rough cutting, precision finish machining and frequent forward-reverse cyclic start-stop operation in metal processing production. Equipped with an independent external forced air cooling module, the motor delivers stable heat dissipation under long-term full-load working conditions and effectively avoids overheat-triggered protective shutdown during continuous heavy cutting tasks. The suffix EMK21 represents exclusive factory customized configuration including 400V industrial rated input voltage, multi-turn high-precision serial encoder and custom-defined mechanical dimensions of output shaft, mounting flange and wiring aviation plug; this tailored specification cannot be directly replaced by standard 08-frame general spindle motors without mechanical modification and servo drive parameter recalibration. Original serial mass production of this model has been phased out, and current available market inventory mainly includes surplus original unused stock and professionally refurbished motors that pass complete factory-standard aging inspection for equipment maintenance replacement projects
Description
UAASKA-08EMK21 AC Spindle Motor Product Specification
1. Product Overview
UAASKA-08EMK21 is a three-phase externally fan-cooled permanent magnet AC spindle motor manufactured by Yaskawa Electric from Japan, belonging to the mature UAASKA spindle series designed for medium-sized vertical machining centers, heavy-duty CNC lathes, precision mold milling equipment and special automated cutting machinery. Adopting high-density laminated silicon steel stator core and optimized rare-earth permanent magnet rotor structure, this spindle unit features wide constant-power speed regulation range, stable high low-speed torque output and low-vibration high-speed continuous running performance to satisfy heavy rough cutting, precision finish machining and frequent forward-reverse cyclic start-stop operation in metal processing production. Equipped with an independent external forced air cooling module, the motor delivers stable heat dissipation under long-term full-load working conditions and effectively avoids overheat-triggered protective shutdown during continuous heavy cutting tasks. The suffix EMK21 represents exclusive factory customized configuration including 400V industrial rated input voltage, multi-turn high-precision serial encoder and custom-defined mechanical dimensions of output shaft, mounting flange and wiring aviation plug; this tailored specification cannot be directly replaced by standard 08-frame general spindle motors without mechanical modification and servo drive parameter recalibration. Original serial mass production of this model has been phased out, and current available market inventory mainly includes surplus original unused stock and professionally refurbished motors that pass complete factory-standard aging inspection for equipment maintenance replacement projects.
2. Model Code Definition
UAASKA serves as the base series identifier of Yaskawa external air-cooled AC spindle motor, among which UA stands for AC spindle classification, K refers to external forced air cooling design and the trailing A marks optimized single-winding internal stator structural layout. The numeric code 08 corresponds to medium frame specification with rated continuous output power of 7.5kW under S3 intermittent operation duty cycle, the core power rating of this spindle model. Letter E denotes 400V three-phase industrial AC rated input voltage different from conventional 200V domestic standard winding version; M represents high-precision multi-loop position feedback structure; K indicates customized reinforced bearing assembly for heavy radial cutting load. The last two digits 21 define exclusive OEM customized mechanical parameters including dedicated output shaft diameter and keyway size, unique flange mounting hole spacing layout and fixed pin assignment of power and encoder aviation connectors, forming an independent customized variant separated from regular 08-frame standard spindle products.
3. Electrical Performance Parameters
This spindle motor is developed for three-phase 400VAC industrial power supply and requires matching original Yaskawa dedicated spindle servo driver to implement full digital vector closed-loop speed and position control system. Its rated continuous output power is 7.5kW with matched rated working current under normal cutting load, and the motor can generate up to 2.8 times instantaneous peak overload torque to buffer transient impact load generated during rough machining of cast iron, carbon steel and thick aluminum alloy workpieces. The built-in M-type multi-turn high-resolution serial encoder defined by model coding transmits real-time rotational speed and absolute angular position digital serial signals to paired servo driver, supporting core CNC machining functions such as rigid tapping, fixed spindle orientation positioning and constant peripheral speed cutting required for high-precision processing. Stator winding complies with Class F insulation grade with embedded built-in thermal sensing components; once sustained overload causes winding over-temperature, the matched driver receives temperature alarm signal and automatically executes output derating or power-off protection to prevent winding burnout damage. Internal circuit is fitted with surge suppression components to suppress voltage spike and electromagnetic interference generated by surrounding frequency conversion equipment and switching power supplies, improving operational stability under fluctuating factory power grid environment.
4. Mechanical Structure and Environmental Usage Requirements
The motor main housing is manufactured with integrated cast aluminum alloy, reaching IP54 dustproof and splash-proof protection standard, paired with separated external cooling fan assembly for forced convection heat dissipation to enhance continuous heavy-load heat management capacity compared with natural cooling spindle motors. Front end is equipped with solid integral output shaft with standard flat keyway for rigid connection with synchronous belt pulley, medium-sized reduction gearbox or direct-coupled machine tool spindle components; rear casing reserves fixed installation position for EMK21 customized aviation plugs for power cable and encoder signal wiring in accordance with exclusive pin definition rules. Standard flange mounting structure is adopted for equipment assembly to realize direct bolt locking on machine spindle box without extra transition fixture processing.
Permissible continuous working ambient temperature ranges from 0°C to +40°C, while permissible storage temperature scope covers -20°C to +70°C; applicable working environment humidity is kept between 5%RH and 80%RH under non-condensing status 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 compensate declined heat dissipation efficiency caused by decreased air density at high altitude. The motor can withstand conventional industrial vibration within 10Hz to 55Hz frequency range; installation in sites filled with corrosive gas, heavy oil mist and accumulated conductive metal dust is strictly prohibited to extend service life of internal bearing, stator winding and precision serial encoder components.
5. Application Scope and Daily Maintenance Specifications
UAASKA-08EMK21 is widely configured as core spindle driving component for medium vertical machining centers, heavy-duty precision CNC turning machines, large mold engraving & milling equipment and fixed cutting stations on automated production lines, applicable to rough and finish processing of ferrous metal, thick aluminum alloy, copper alloy and high-hardness engineering plastic parts. During routine maintenance, operators need regular cleaning of external cooling fan filter screen to eliminate dust blockage leading to poor heat dissipation and unexpected over-temperature protection alarm; periodic inspection of output shaft bearing lubrication status and aviation connector wiring tightness is mandatory to avoid bearing oil leakage and loose wiring-induced abnormal spindle speed fluctuation. For breakdown replacement maintenance, original matching multi-turn serial encoder and EMK21 specification exclusive dedicated power cables must be selected; mismatched replacement accessories will cause 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 following original factory technical standards before delivery to guarantee consistent performance parameters with brand-new original motors.
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