Unbalanced roll mass testing method for roll-type washing machine

The present invention discloses a method for detecting drum unbalanced quality of drum washing machine, which is characterized by that according to the error E of actual rotating speed and set rotating speed it utilizes error proportional term P produced when it adopts PID method to make motor speed regulation and integral term D when it adopts PID method to regulating motor speed as error integral term, and utilizes that unbalanced quality is equal to aP+bD to calculate result. It has no need of accumulation for a long period, its calculation is simple, real-time property is strong and its measurement is accurate and reliable. It can be extensively used for detecting unbalanced drum of drum washing machine.