|Design SimplificationThe X and Y axes
were respectively fitted with linear and torque motors that were able to carry their loads without any intermediary components. This decreased the component count and increased the machine's reliability.
Reduced Machine Assembly TimeThe use of motors
that are connected to their loads without additional transmission components vastly simplifies machine assembly and maintenance
Reduced Energy Costs
Reduced component count also reduces the energy losses associated with transmission equipment.
Direct drive componentry simplifies maintenance tasks significantly by eliminating unnecessary components and linkages.
An Elmo Motion Control Cello digital servo drive was used on each axis.
These drives contain a digital signal processor for motor control, feedback and programming. By using Elmo drives, and custom-written
software, Motor Power Company was able to eliminate the need for a centralized motion controller, at a significant cost savings.
In this design, Motor Power Company uses a PC to generate motion profiles for each axis. The profiles are sent to the Cellos,
in PVT format, over a CANopen link.
The CANopen bus also contributes to the overall cost effectiveness and reliability of the design, because it enables daisy-chain
communications rather than a dedicated communication and control cabling for each axis.