Compared to the previous generation of integrated motor drives, there is also support for extended field line I/O and energy-saving options using bus sharing. Fieldline I/O can be mounted in closer proximity to the motor/drive combination, and are usually rated IP69, so that the machine designer doesn't need to keep all of the I/O in the control cabinet and long wiring runs back to the cabinet are eliminated.
From an application point of view, Alzayyat said there is interest in larger drives and motors for higher power applications. Right now, Bosch Rexroth carries four different sizes from 1kW to 5kW.
Smart motor technology
Hack Summer, manager of applications technology for Moog Animatics, told us:
The continuing adoption of integrated motor drive technology is resulting in almost every key automation and servo manufacturer coming out with an integrated motor drive product. But while our product is designed as an intelligent motor, other products are basically operating as a slave device to a master bus protocol.
OEM machinery builders can use closed-loop PID (proportional, integral, derivative) control of integrated motion control systems to set and maintain a critical tension level while taking advantage of new commands created specifically for winding and spooling applications.
Our SmartMotor products have a controller and a drive on them, but they can also become the master controller for the entire machine. As a customer adds additional axes to the system, the update rate stays the same because every single axis has its own closed-loop PID process control. One master is not taxed with having to deal with loop closure on all of the other axes.
A key technology that Moog Animatics is adding within its system is application-specific firmware capabilities. Systems can use sensory feedback (analog or digital inputs, for example) to determine where and when to perform the motion sequences, responding and reacting to the machine process using specific code stored in the firmware of the motors. One new application that uses this approach is capabilities for traverse and take-up winding.
Summer said that typically these systems work with a standard OEM winding machine that provides mechanical solution for traversing back and forth as it is letting out the line on the spool. Or a motion controller is commanding the drive to go back and forth to do this operation.
"What we have done is implement customized firmware within the motor that, once the user sets up the spool width and applications parameters for traversing back and forth, the system does it completely on its own without any user code running," said Summer.