Motors & drives
Coreless DC motors (ironless motors) and brushless DC motors (BLDC motors) have many features over traditional motor designs that make them more suitable for applications requiring highly dynamic motion control.
They typically have lower inertia, higher efficiencies and extremely long life spans. Applications include robotics and life critical medical devices. Previously, applications that needed to use the peak performance capabilities of motors and in particular for multi-axis control, the system bottleneck was often the speed capabilities of the motion controller.
The new DC motor position controller from Maxon Motor incorporates the latest FPGA componentry allowing full use of the most dynamic DC motors available.
The controller features the fastest control cycles for path calculations in sophisticated multi axis coordinated movement applications. It has an internal current controller clock operation of 100kHz and a communication rotation of 100μs with the EtherCAT master.
High resolution distributed clocks can be supported for a powerful solution whereby coordinated servo axes can carry out motion with absolute synchronicity. CAN over EtherCAT is supported as well as cyclic synchronous path planning with a closed loop PID over the network. The controllers processing capability even allows sinusoidal commutation of brushless DC motors up to speeds of 200,000rpm.
Almost any customer preferred feedback topography is accepted. This further opens the range of DC motors that can be controlled, whether brushed or brushless, including absolute, incremental, sinusoidal (sinecos) analogue incremental encoders.
Even multiple encoders for dual loop motor control can be used, allowing for example, a digital incremental encoder to be mounted to the DC motor for accurate velocity control and an absolute SSI encoder mounted to the load for position control. Closing dual loops in this fashion allows for extremely accurate control of the position around gear head backlash or load and coupling elasticity.
With more than 20 years' experience of motion control Maxon Motor controllers have become synonymous with reputation of safety by incorporating almost every protection possible.
Another key feature of high-end motor controllers that is often overlooked is the ability to protect users, loads, sensitive equipment and the drive system itself with accurate current limiting circuitry. A new graphical user interface has made installation easier than ever.