FPGA Technology and Software IP in Power Electronics Applications

Using NI CompactRIO for FPGA-based motor control in Factory Automation

Here’s a recent article written by Greg Crouch, Embedded Systems Business Director at National Instrument., on the topic of FPGA-based motor control for Factory Automation.

Embedded-machine builder EUROelectronics reduced power use with FPGA-based field-oriented control (Source : National Instruments)

FPGA-based algorithm control delivers better efficiency than microprocessors can achieve. A wide range of control-system algorithms are available, including trapezoidal, sinusoidal and field-oriented.

Trapezoidal, or six-step, control is the simplest but lowest-performance method. For each of the six commutation steps, the motor drive provides a current path between two windings while leaving the third motor phase disconnected. However, torque ripple causes vibration, noise, mechanical wear and greatly reduced servo performance.

Sinusoidal control, also known as voltage-over-frequency commutation, addresses many of these issues. A sinusoidal controller drives the three motor windings with currents that vary smoothly. This eliminates torque ripple issues and offers smooth rotation.

More information on NI CompactRIO can be found directly on their website.

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