Electric power assisted steering system

The utility model relates to an electric power assisted steering system which is applied to the field of automobile manufacturing; the electric power assisted steering system comprises a shaft assembly, a sensor assembly, a shell assembly, a controller, an actuating mechanism and a direct-driving motor; an electric power assisted steering signal from the shaft assembly is acquired by the sensor assembly, the signal is fed into the controller by a connecting wiring harness, the controller transmits a control signal to the direct-driving motor after carrying out logical operation and imitation calculation, the direct-driving motor drives the actuating mechanism to realize power-assisted steering, active alignment and damping control of an electric power assisted steering device. The utilitymodel adopts the direct-driving motor to realize direct-driving non-contact control, thereby solving the technical problems that the prior art has complex structure and limited power, and is easy to wear and is not suitable f