Drive control system of permanent magnet synchronous motor

The invention discloses a drive control system of a permanent magnet synchronous motor. The drive control system is connected with an upper computer; the drive control system comprises a digital signal processor, an isolated unit, a drive circuit, a three-phase fully-controlled rectifier bridge, the permanent magnet synchronous motor, an interface circuit, a current measurement circuit, a rotating speed measurement circuit and an analog/digital (A/D) converter connected sequentially, wherein the current measurement circuit and the A/D converter are sequentially connected between the permanent magnet synchronous motor and the digital signal processor; the rotating speed measurement circuit is connected between the permanent magnet synchronous motor and the digital signal processor; and the digital signal processor is connected with the upper computer through the interface circuit. The drive control system is simple in structure and low in cost, and has relatively high practical application value.