Description

1. Product Overview

Perske KNS 51.14-2D is a high-frequency precision CNC spindle induction motor manufactured in Germany by Perske, belonging to the KNS series square high-speed milling spindle drive unit. It is specially developed for numerical control engraving, composite material and aluminum high-precision cutting & milling equipment, and matched with hydraulic tool chuck systems.

Equipped with a rigid spindle structure of double precision ball bearings, the fully quenched and ground shaft core achieves micron-level low runout accuracy. Supported by variable frequency wide-speed regulation, it realizes stable continuous operation within the wide speed range of 6000~12000rpm. Adopting vacuum winding impregnation technology and external fan forced air cooling, it reaches IP54 protection grade and is manufactured in strict accordance with German DIN industrial motor standards with excellent vibration and temperature rise control indicators. Widely applied to CNC engraving machines, CNC routing machines, plate processing centers and door & window profile milling production lines, it is commonly used for spare replacement of aged spindle motors on woodworking processing equipment and precision upgrading renovation of CNC machining equipment.

2. Hardware Structure and Composition

2.1 High-precision Rigid Spindle Bearing Unit

It adopts double-row precision ball bearing support structure. The spindle undergoes overall quenching and precision outer circle grinding, with a unified standardized tool clamping interface at the shaft end compatible with PKD series hydraulic chuck tools. After factory precision dynamic balance calibration, the total radial and axial runout is controlled within ≤8μm, enabling vibration-free high-speed cutting and gap-free clamping to greatly extend the service life of milling cutters and engraving tools. The bearing housing is integrally cast from cast iron with high rigidity and resistance to cutting impact, resisting deformation under long-term heavy load operation.

2.2 High-frequency Variable Frequency Induction Winding Power Unit

The stator winding adopts vacuum integral impregnation insulation technology with Class F insulation grade, resisting harmonic impact from frequency converters. It adapts to 0~200Hz wide-frequency output of variable frequency drives, delivering stable rated power at different frequencies without high-speed power attenuation. A built-in PTC thermistor temperature measuring probe monitors winding temperature rise in real time, cooperating with the frequency converter to realize overheat shutdown protection and prevent winding burnout caused by high temperature.

2.3 Air Cooling Heat Dissipation & Enclosure Protection Unit

The main body adopts an aluminum alloy die-cast heat dissipation housing with an independent external axial flow fan for forced convection heat dissipation. The terminal box reaches IP55 protection grade and the whole machine IP54. The integrated forming heat dissipation fins on the housing control temperature rise under long-time high-speed cutting conditions and eliminate machining accuracy drift caused by thermal expansion. Strong and weak current wiring areas are physically separated, and the wiring terminals adapt to various specifications of power shielded cables to resist dust and slight moisture erosion.

2.4 Standard Mechanical Mounting & Fixing Unit

The square standard flange mounting structure adopts universal equipment installation dimensions, enabling direct replacement of old KNS series spindle motors of the same specification. The integrated compact design weighs 13.5kg with small installation space occupation, suitable for compact CNC processing racks. Positioning pin holes are reserved on the mounting base to guarantee motor coaxiality and reduce vibration during high-speed operation.

KNS 51.14-2D.jpg

3. Technical Specifications

3.1 Electrical Performance Specifications

Variable frequency operating frequency: 100Hz / 150Hz / 200Hz
Corresponding rated speed: 6000rpm / 9000rpm / 12000rpm
S1 continuous rated power: 2.4kW (6000rpm), 3.5kW (9000rpm), 4.0kW (12000rpm)
Insulation Class: Class F
Temperature measuring component: built-in PTC thermistor for overheat protection
Compliance Electrical Standards: DIN EN 60034-1, VDE 0530-17
Vibration Grade: Veff＜1.8mm/s, compliant with DIN EN 60034-14
Balance Standard: DIN ISO 2373 precision dynamic balance Grade R

3.2 Environmental Protection Specifications

Operating Ambient Temperature: Max. +40℃, altitude ≤1000m
Storage & Transportation Temperature: -40℃~+70℃
Relative Humidity: 5%~95%RH, non-condensing, free of corrosive dust
Overall Protection Class: IP54; Terminal Box: IP55
Cooling Method: External fan forced air cooling
EMC Compliance: Industrial equipment anti-interference standard, suitable for variable frequency drive working conditions

3.3 Mechanical Specifications

Net Weight: 13.5kg
Housing Material: Aluminum alloy heat dissipation shell; Bearing Housing: Cast iron
Shaft End Precision: Total radial & axial runout ≤8μm
Mounting Method: Standard square flange, horizontal & vertical dual-purpose installation
Winding Process: Vacuum impregnated insulation
Optional Accessories: Matching variable frequency drive, hydraulic tool chuck, shielded power cable, spindle maintenance bearing kit, original replacement fan

4. Product Functions and Features

Micron-level low runout spindle ensures high-precision cutting processing

Double ball rigid bearings + quenched ground spindle with factory precision dynamic balance calibration delivers vibration-free high-speed milling and engraving without machining texture marks, achieving higher surface finish for plates, aluminum and composite materials, reducing subsequent polishing procedures and lowering tool wear loss.

Wide-frequency constant power output enables stable processing across full speed range

0~200Hz wide frequency adaptation delivers stable rated power output from 6000 to 12000rpm, supporting stable torque output for both low-speed heavy cutting and high-speed fine carving, ideal for integrated multi-process CNC processing equipment.

Built-in overheat temperature measurement protection prevents winding burnout

The built-in PTC temperature detection probe inside the winding uploads temperature signals to the variable frequency drive in real time. The drive will automatically reduce frequency and shut down upon winding overheating, avoiding insulation aging and motor burnout caused by long-time heavy load cutting and extending the overall service life.

Forced air cooling + vacuum insulated windings support long-term continuous production

Vacuum impregnated windings resist aging caused by variable frequency harmonics, and the independent external fan continuously dissipates heat from the housing, enabling 7×24 hours non-stop continuous operation for mass assembly line processing of furniture plates and composite materials.

Standardized universal flange structure facilitates convenient spare replacement

The unified square flange installation size allows direct on-site replacement of old KNS series motors without modifying equipment racks and transmission structures. The standardized tool interface is compatible with mainstream hydraulic milling chucks on the market, shortening construction and commissioning cycles for equipment renovation and spare replacement.

5. Applicable Working Conditions and Application Scenarios

CNC routing and engraving machining centers for solid wood, MDF and multi-layer boards, supporting high-precision milling spindle drive for plate grooving, shaping and relief carving.
CNC processing equipment for aluminum profiles, plastics and carbon fiber composite materials, matched with high-speed fine carving, cutting and drilling spindle.
Automatic production lines for doors, windows and furniture, supporting spindle motors for multi-process CNC milling machine mass continuous processing.
CNC engraving machines for advertising acrylic and foam boards, serving as power units for high-speed fine pattern processing equipment.

Perske KNS 51.14-2D CNC Spindle Induction Motor