Direct-current brushless motor control device and control method

The invention discloses a direct-current brushless motor control device and a control method. A motor driver control command output of a DSP digital processor is connected with an FPGA signal processor; a motor driver control voltage signal output end of the FPGA signal processor is connected with a signal input end of a differential amplifier through a digital-to-analog converter; a signal outputend of the differential amplifier is connected with a control voltage input end of the motor driver; the signal output end of a circular grating position sensor is connected with the FPGA signal processor; an address and data bus communication end of the DSP digital processor is connected with the FPGA signal processor; a reversing time sequence control signal output end of the FPGA signal processor is connected with a reversing time sequence control end of the motor driver; and a motor drive voltage feedback signal output end of the motor driver is connected with a voltage feedback signal input end of the DSP digita