Page 37 - AMTDC Annual Report 2019-20flipbook
P. 37
The technology for motor drives is a much sought-
after core capability with wide applicability and
ramifications. The machine tool sector requires specific
development which caters for high precision control to
obtain good machining performance and finish details. Overcoming Technology Gap
This technology is dominated by few major players in
the world, and none of them is Indian. in Developing Motor Drives
Axis motors are permanent magnet synchronous
motors, which require control in synchronism with the The technologies related to motor
speed determined. Due to their being responsible for drives for precision machining are available
the accuracy of machining, it is critical to overcome in the global players. These require close
non-ideal natures of the motor and the inaccuracies coordination between the motor drive and
that may result due to impact loads being felt by the motor itself with good data available for
cutting edges of the spindle. The project has developed motor characteristic. Both motors and
these control methods and an observer-based load drives for these applications are hardly
estimator to effectively reduce the impact of motor available in India. The motor drive requires
non-idealities and load variations. a complex control algorithm and these
Spindle motors on the other hand are usually details, though theoretically known, are
induction machine due to their higher power. Their difficult to implement.
control mechanisms are little more complicated than
that of the synchronous motors and it is critical that AMTDC-CoE in collaboration with its
they maintain speed accuracy to achieve the desired industry partner IDAPL took up the
performance. In the project spindle drives up to 25 kW challenge of developing such highly
power levels are to be developed to meet the needs of sophisticated technologies indigenously to
the machine tool industry. overcome this technology gap and thereby
obtain relief from import dependence. The
The developed drives and power inverters have
been tested to exacting standards by third party tests successful development is sure to bring a
and benchmarked against the best that are available considerable cost advantage in developing
from global leaders for operation. The developed these technologies indigenously.
motor drives have been found to work as expected on
test VMC machines.
36
AMTDC Annual Report | 2019-20
