Driver state observer, and velocity estimation method and velocity estimation system for the driver

The present invention discloses a velocity estimation method for a driver. The method includes the steps as follows: comparing a received actual rotation angle of a motor with an initial value of a rotation angle of the motor to acquire a rotation angle error of the motor; calculating by utilizing the rotation angle error, an accommodation coefficient of an accommodator, a basic characteristic quantity of the motor, and a preset equation to acquire an estimation rotation velocity and an estimation rotation angle of the motor; and comparing and judging whether the estimation rotation angle of the motor is equal to the actual rotation angle of the motor, and returning to the step of the rotation angle error calculating until the estimation rotation angle of the motor is equal to the actual rotation angle of the motor if the estimation rotation angle is not equal to the actual rotation angle of the motor, at the moment, the estimation rotation velocity of the motor is an actual rotation velocity. The rotation velocity of the motor can be acquired accurately and quickly in real time by the utilization of the estimation method, and a system performance is enhanced. Furthermore, the present invention also discloses a state observer which utilizes the estimation method, and a velocity estimation system.