Steven H Plume

US Patent:

7971810, Jul 5, 2011

Filed:

Sep 5, 2008

Appl. No.:

12/204827

Inventors:

Nicholas J. Hirsch - Wind Lake WI, US
Steven Harry Plume - Springdale AR, US

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

B02C 25/00

US Classification:

241 35

Abstract:

A food waste disposer has a motor driven with pulse width modulation (“PWM”). A grinding profile is controlled based on PWM values of the PWM controller driving the motor. In an aspect, controlling the grinding profile includes varying the speed of the motor based on the PWM values. In an aspect, the grinding profile is initiated after the food waste disposer is started and a PWM value exceeds a set value indicating the presence of a grinding load in a grinding section of the food waste disposer. In an aspect, it is determined that the grinding load has been sufficiently ground once the PWM value does not exceed a first set value after the grinding profile has been initiated. In an aspect, corrective action is initiated when the PWM value exceeds the set value after a predetermined period of time.