Patent ID: 8274251

Claim:
A method of operating a drawer of a refrigerator, the method comprising: activating a drive motor; detecting an RPM of the drive motor, comprising: detecting a current frequency generator (FG) pulse signal generated by rotation of the motor; comparing the current FG pulse signal to a most recent previous FG pulse signal to determine an interval between the current and the most recent previous FG pulse signal; determining if the interval falls within a predetermined range; and determining that the RPM of the drive motor is at a normal RPM if the interval is within the predetermined range, determining that the RPM of the drive motor is greater than the normal RPM if the interval is less than the predetermined range, and determining that the RPM of the drive motor is less than the normal RPM if the interval is greater than the predetermined range; and based on the detected RPM, either (1)continuing to move the drawer using the drive motor, or (2) stopping the drive motor such that a movement of the drawer stops.