High-speed current dq PI controller for vector controlled PMSM drive.

Area of Science:

• Electrical Engineering
• Control Systems
• Power Electronics

Background:

• Vector-controlled permanent magnet synchronous motors (PMSMs) require high-speed current controllers for optimal performance.
• Traditional Digital Signal Processor (DSP) based controllers are approaching their physical limits in terms of speed and incur high implementation costs.
• Existing digital solutions face limitations in execution time, typically in the microsecond range.

Purpose of the Study:

• To develop and implement a high-speed current controller for PMSMs utilizing Field-Programmable Gate Arrays (FPGAs).
• To achieve significantly reduced execution times compared to conventional DSP-based controllers.
• To validate the performance and accuracy of the FPGA-based controller through experimental analysis.

Main Methods:

• A modular design approach was adopted for faster computational efficiency.
• A fixed-point proportional-integral (PI) method was employed for enhanced accuracy in current control.
• The entire controller algorithm was implemented on a Field-Programmable Gate Array (FPGA).
• An Agilent 16821A Logic Analyzer was used for experimental validation.

Main Results:

• The proposed current dq PI controller implemented on FPGA achieved an execution time of only 50 nanoseconds (ns) at a 40 MHz clock speed.
• This represents a significant reduction in computational cycle compared to existing DSP-based solutions.
• Experimental validation confirmed the successful implementation and high-speed operation of the FPGA controller.

Conclusions:

• FPGA implementation offers a substantial improvement in execution speed for high-speed current controllers in PMSMs.
• The developed controller provides a cost-effective and highly efficient solution for demanding motor control applications.
• The achieved 50 ns execution time sets a new benchmark for current control in the era.