A method for determining a drying of a food waste disposer contains steps of: saving a comparison table of a pressure temperature of a saturated water vapor in a control unit of the food waste disposer; starting drying process; and calculating. The method further contains a step of judging automatically, after calculating the current target humidity value U.sub.b, the control unit compares the current relative humidity U.sub.1 with the current target humidity value U.sub.b and automatically determines a drying status of the food waste disposer and controls a working status of the drying device based on a comparison result.

A method for determining a drying of a food waste disposer contains steps of: saving a comparison table of a pressure temperature of a saturated water vapor in a control unit of the food waste disposer; starting drying process; and calculating. The method further contains a step of judging automatically, after calculating the current target humidity value U.sub.b, the control unit compares the current relative humidity U.sub.1 with the current target humidity value U.sub.b and automatically determines a drying status of the food waste disposer and controls a working status of the drying device based on a comparison result.

A method for estimating relative humidity inside an electrical machine includes determining a measured rate of change (ROC) of temperature inside an electrical machine. A ratio of the measured ROC to a reference ROC is calculated, where the ratio is equal to an average specific heat of the electrical machine. The average specific heat of the electrical machine and an air temperature value are then compared to known specific heat values of dry air and water corresponding to a known relative humidity values for a range of air temperatures. A relative humidity value inside the electrical machine is estimated based on the comparison.