Ultrasonic imaging system, control method thereof and ultrasonic trolley

An ultrasonic imaging system comprises a host, a control panel, trundles, a motor, a handle, a pressure sensor and a motor control circuit, the motor corresponds to a driving wheel, the power output end of the motor is coupled to the corresponding driving wheel, the motor rotates to drive the driving wheel to rotate, and the pressure sensor is arranged on the handle and used for detecting force applied by an operator. And the motor control circuit is configured to adjust the driving force output by the motor based on the force application electric signal. The driving force of the motor is calculated based on the force applied by the operator, so that the driving force of the motor can change in real time along with the force applied by the operator, and the force applied by the operator is reversely adjusted in combination with the moving resistance of the trolley, so that the force applied by the operator required by the moving state of the trolley is close to the expected force applied by the operator; ther