Patent ID: 9564849
Date: 2017-02-07
CPC Classifications: G01G,H02P

Claim:
1. A system for weighing flowing materials, the system comprising: a conveyor arranged to receive and move a flow of materials that is moving at a predetermined infeed velocity prior to arriving onto the conveyor; a servo motor arranged to drive the conveyor; a servo amplifier coupled to the server motor to control the servo motor responsive to a velocity feedback signal and a velocity command input signal, wherein the velocity feedback signal is responsive to a current velocity of the conveyor; a servo controller arranged to generate the velocity command input signal, wherein the velocity command input signal is selected to maintain a constant conveyor velocity that is greater than the infeed velocity; wherein the servo amplifier is configured to generate torque sensing signals responsive to a comparison of the velocity feedback signal to the velocity command input signal; and a processor configured to acquire the torque sensing signals from the servo amplifier and to calculate a mass of the flowing material per unit time based on summing the torque sensing signals over a given time period.