Software and Hardware Collaborative Design of PMSM FOC System Based on CORDIC Algorithm Improvement

The field-oriented control (FOC) algorithm for permanent magnet synchronous motor (PMSM) is limited by the processing power of the microcontroller, which affects the control performance. In order to improve the execution speed of the algorithm, we propose to implement the FOC algorithm on a field programmable gate array (FPGA) as a hardware circuit and embed a 32-bit ARM processor to form a hardware-software cooperative control system, which takes into account the parallel computing advantage of using hardware to implement the FOC algorithm and the flexibility of using software to configure the FOC algorithm. The second problem is that the coordinate transformation and trigonometric functions involved in the FOC algorithm are difficult to be implemented by a hardware circuit, and we propose to use the rotation mode and vector mode of the coordinate rotation digital computer (CORDIC) algorithm to convert it into an easy-to-implement hardware structure, and to convert the coordinate transformation and space vector pulse width modulation (SVPWM) is optimized in hardware. Simulations and experiments have shown that the proposed scheme reduces hardware resources, enables current-loop closed-loop control, and supports register software reconfigurability.