The GK960 AC Drives solution from GTAKE is designed for high-precision CNC machine tools, including machining centers, CNC lathes, and high-speed engraving and milling machines. As a dedicated spindle control solution, the GK960M combines high-resolution encoder processing, advanced vector control, dynamic motor winding management, and high-speed industrial Ethernet communication to provide precise and stable spindle control for demanding machining applications.
While the industry continues to focus on response bandwidth and rotational speed, GTAKE advances spindle control through higher angular resolution and deeper process integration. Powered by proprietary control algorithms, the GK960M provides arcsecond-level precision control and a process-optimized AC motor drive platform for applications requiring accurate spindle positioning, stable speed regulation, rigid tapping, C-axis indexing, and high-speed machining.
Machine tools are widely regarded as the “mother machines of industry”, and their spindle systems are evolving from conventional speed closed-loop control toward more precise position and process control. General-purpose AC drives can provide speed and torque regulation, but high-end precision machining requires more refined angular control throughout the machining process. This makes dedicated spindle drive technology increasingly important for integrating the encoder, motor winding, drive controller, and CNC system into a coordinated variable speed drive system.
1. Coarse angular resolution creates blind spots in precision machining. High-gloss curved-surface machining, C-axis indexing, rigid tapping, and other precision processes require accurate spindle positioning and stable angular control. Conventional AC motor drives based on general-purpose servo platforms may rely on external fieldbus communication, which can introduce additional latency during communication and interpolation. Fixed-frequency encoder decoding can also limit angular resolution during low-speed operation and frequent reversing, potentially affecting tool marks and machining consistency. The GK960M addresses these requirements through dedicated high-resolution encoder processing and optimized AC drive motor control.
2. Conflicting requirements between low-speed and high-speed winding make it hard for a single system to balance rigidity and dynamic performance. Heavy roughing requires high low-speed torque for material removal, while precision finishing requires stable high-speed rotation. Traditional solutions may use dual-winding motors or dedicated built-in motor spindles, increasing mechanical complexity, procurement requirements, and maintenance workload. The GK960M uses intelligent star-delta winding switching to enable a single spindle drive system to cover both low-speed high-torque machining and high-speed precision finishing.
3. Shallow-level bus integration restricts commissioning efficiency due to protocol conversion. Multi-axis synchronized machining relies on high-speed synchronous fieldbus communication. External communication cards and protocol converters can increase system complexity and commissioning time while limiting compatibility with different CNC systems. The GK960M integrates industrial Ethernet communication directly into the drive architecture, providing a more integrated AC motor drive controller solution for CNC machine tools.
With nearly 20 years of expertise in power electronics and motor drive technology, GTAKE applies its industrial control capabilities to precision spindle applications. The GK960M integrates chip-level PWM modulation, high-precision encoder subdivision decoding, dynamic winding topology management, and proprietary vector control algorithms into a dedicated AC motor drive platform for CNC machine tools.
The system provides wide-frequency output from 0 to 1500 Hz and supports mainstream industrial Ethernet protocols including MECHATROLINK-III, EtherCAT, and PROFINET, with a minimum communication cycle of 250 μs. Through intelligent star-delta switching, one drive unit can support both low-speed high-torque rough machining and high-speed precision finishing.
Available in dedicated built-in spindle and full digital bus configurations, the GK960M provides a flexible variable speed drive system for CNC equipment and supports integration with mainstream domestic CNC systems.
Equipped with a dedicated processing unit for encoder subdivision and paired with a 512-pole sine/cosine encoder, the GK960M achieves high-precision decoding of up to 2.09 million pulses per revolution, with repeat positioning accuracy of 0.01° and indexing accuracy of 0.001°.
This high-resolution ac drive motor control technology enables precise control of spindle entry and retraction angles for demanding machining operations. It helps reduce undesirable tool marks, improve the surface finish of curved workpieces, and maintain consistent dimensional accuracy in precision machining.
For CNC applications requiring accurate spindle positioning, rigid tapping, C-axis indexing, and high-speed machining, the GK960M provides a dedicated AC servo motor drive architecture rather than relying solely on conventional speed control.
Automatic star-delta winding switching enables a single motor to provide high torque at low speeds and high power at high speeds. The GK960M can output 200% rated torque at 0 Hz and maintain stable operation during high-speed field-weakening operation.
This wide operating range allows one motor AC drive to support different machining stages, including heavy roughing, precision finishing, constant peripheral speed cutting, rigid tapping, and C-axis indexing.
By combining low-speed torque capability with high-speed operation, the GK960M can reduce the need for separate spindle drive configurations and simplify the overall machine design.
No external protocol converter is required. The GK960M mainboard connects directly to industrial fieldbus systems and participates in high-speed CNC interpolation.
Support for MECHATROLINK-III, EtherCAT, and PROFINET enables the drive to communicate directly with the CNC control ecosystem. With a minimum communication cycle of 250 μs, the integrated architecture helps reduce communication-related delays and simplify system commissioning.
For machine builders and CNC system integrators, this native communication architecture provides a more streamlined AC drive controller solution and supports efficient integration of spindle control into the overall CNC system.
Optimized PWM modulation and dead-time compensation algorithms reduce harmonic heat generation at the source, helping control spindle temperature rise and thermal deformation.
For long-duration CNC production, thermal stability is important for maintaining spindle rigidity and machining accuracy. By integrating thermal control into the drive control strategy, the GK960M supports stable operation of the variable speed motor drive under continuous production conditions.
A conventional variable speed drive primarily focuses on motor speed regulation. CNC spindle applications, however, require coordinated control of speed, torque, position, and machining processes.
The GK960M extends the role of the AC motor variable frequency drive by integrating high-resolution encoder processing, advanced vector control, winding switching, and direct CNC communication. This architecture allows the spindle drive to respond to different machining requirements while maintaining stable control across a wide speed range.
For machine builders looking for an AC motor drive speed control solution, the GK960M provides a dedicated architecture for precision spindle applications rather than a general-purpose inverter configuration.
GTAKE has nearly 20 years of experience in power electronics and motor drive technology. Its product portfolio covers AC drives, motor control systems, and application-specific drive solutions for industrial equipment.
For CNC machine tool applications, GTAKE combines drive technology, control algorithms, communication integration, and application experience to develop dedicated spindle drive solutions.
Explore GTAKE’s:
This combination supports machine manufacturers and system integrators seeking reliable electric motor drives, AC motor drive controllers, and application-specific variable speed drive solutions.
The GK900M Series is engineered for the relentless demands of modern machine-tool environments. Ultra-precise rotation control at maximum speed and torque guarantees parts with micron-level accuracy and mirror-smooth finishes—every cycle, every job. It also accelerates tapping cycles and other specialty machining operations, unlocking higher throughput without compromising quality.
