Hardware Approach of Two Way Conversion of Floating Point to Fixed Point for Current dq PI Controller of FOC PMSM Drive

  • Mohd. Marufuzzaman Universiti Kebangsaan Malaysia
  • M. B. I. Reaz Universiti Kebangsaan Malaysia
  • M. A. M. Ali Universiti Kebangsaan Malaysia
  • L. F. Rahman Universiti Kebangsaan Malaysia


Real time self-automated hardware implementation of current dq PI controller for FOC PMSM is desired. Nevertheless, the controller needs some floating-point calculations, which necessitate expensive computing elements. Moreover, additional bits for implementing arithmetic operations are required for floating point calculation. This research proposed a hardware approach of 64bit floating point to 16-bit fixed-point conversion and vice versa. This conversion method will reduce the bit requirements. Any application which is required 16-bit floating-point calculation can be used this two-way conversion technique. In addition, current dq PI controller uses 16-bit I/O bus. Thus, hardware approach of this two-way conversion is a prerequisite for FPGA realization of current dq PI Controller for FOC-PMSM drive. The outcome of this research is a single chip 16bit to 64bit IEEE 754 standard number format converter for current dq PI controller of FOC-PMSM drive. Ill. 11, bibl. 12, tabl. 1 (in English; abstracts in English and Lithuanian).

DOI: http://dx.doi.org/10.5755/j01.eee.123.7.2382