Patent ID: 7746063
Filing Date: 2010-06-29
Classification: G01P

Abstract:
1. A method comprising: receiving in one or more modules an input signal containing information about one phase of an AC power supply that provides power to a pump or other suitable rotating equipment, the one phase of the AC power supply being directed, before being rectified, through a zero crossing circuit, and the input signal containing information about an instant of time the AC voltage crosses from one polarity to the other polarity and triggers a square wave pulse for each instant time; and providing from the one or more modules an output signal containing information to control the pump or other suitable rotating equipment based at least partly on a determination of the rotational speed of the pump that depends on the information contained in the input signal received, such that the need for a Hall Effect or other suitable sensor and its associated wiring otherwise used to obtain the rotational speed of the pump is eliminated.