Page 8 - Industrial Technology Extra 7th September 2020

MACHINE TOOLS...

The drive to minimise power

losses in machine tools

Drive controllers and filters from KEB minimise power losses in high speed
machine tool spindles and turbo blowers for increased performance

ew drive controllers and motor filters for input/output filters and sinusoidal filters based on
high frequency (HF) applications from the latest core materials, ensure the long operating
KEB Automation are helping customers life of CNC main spindles and high speed
Ndevelop highly efficient machine compressors.
concepts for turbo blowers and CNC machine tool The two main features are based on the winding
spindles. The objective is to increase performance protection and the stabilisation of the thermal
and protect the motor windings at output balance of the HF motors. As Fischer states: “By
frequencies up to 2,000 Hz. using a specially designed HF motor choke, both the
“For industrial high speed applications, we have voltage level in the winding and the rate of voltage
developed particularly powerful drive controllers, rise [dU/dt] can be reduced to below 500 V/µs.”
which our customers are using to operate all Both are main factors that affect the lifetime of
common high frequency spindles and high speed the insulation. In addition, there is a noticeable
motor types,” explains Fabian Fischer, Team Leader reduction in the high frequency spectrum and
Application Sales at KEB Automation. The therefore an improvement in the power loss balance
associated motor filter technology is an important in the motor. For very thermally-sensitive systems
part of the drive package. HF motor chokes, such as air bearing spindles or the electromagnetic

September 2020 • INDUSTRIAL TECHNOLOGY EXTRA • p8