Three-phase permanent magnet synchronous motor driving circuit

The invention provides a three-phase permanent magnet synchronous motor driving circuit. The three-phase permanent magnet synchronous motor driving circuit includes a digital circuit which can realize control algorithms of a position loop and a speed loop and an analog circuit which can realize a current closed loop and PWM signal generation; the digital circuit includes an FPGA, a DSP and a DAC; the analog circuit includes a 2/3 conversion circuit, a current loop regulating circuit, a triangular wave generator, a comparator, a current detection circuit and a three-phase bridge driving circuit; the FPGA, the DSP and the DAC are connected with one another sequentially; the 2/3 conversion circuit is connected with the DAC; the current loop regulating circuit is connected with the 2/3 conversion circuit; the current loop regulating circuit is connected with the comparator and the current detection circuit respectively; the three-phase bridge driving circuit is arranged between the comparator and the current detection circuit; and the triangular wave generator is connected with the comparator. With the three-phase permanent magnet synchronous motor driving circuit of the invention adopted, three-closed loop (the position loop, the speed loop and the current loop) three-phase permanent magnet synchronous motor control can be realized.