Speed indication for pump condition monitoring
First Claim
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.
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Accused Products
Abstract
A method and apparatus are provided for obtaining the rotational speed of a pump system or other suitable rotating equipment having a self-contained pump electrical equipment power supply. The method features, before being rectified, directing one phase of AC power through a zero crossing circuit that identifies 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. In operation, the AC voltage is detected when it crosses from a negative polarity to a positive polarity, or vice versa. The method also includes steps for measuring the period of the square wave pulse and calculating the speed of the pump or other rotating equipment.
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Citations
19 Claims
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1. A method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pump system or other suitable rotating equipment having a power supply for providing AC power to a pump or other suitable rotating equipment, comprising:
- a control module configured to;
receive 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 provide 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. - View Dependent Claims (8, 9, 10, 11)
- a control module configured to;
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12. A control module comprising:
one or more modules configured to receive an input signal containing information about one phase of an AC power supply that provides power to a pump or other suitable rotating equipment, where the one phase of the AC power supply is directed, before being rectified, through a zero crossing circuit, and where the input signal contains 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
configured to provide 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.- View Dependent Claims (13, 14, 15)
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16. A pump system or other suitable rotating equipment having a power supply, comprising:
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a zero crossing module or circuit configured to respond to one phase of AC power from the power supply, before being rectified, to identify an instant of time the AC voltage crosses from one polarity to the other polarity and to provide a signal containing information about a square wave pulse for each instant time; and one or more control modules configured to receive the signal and to provide 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 or other suitable rotating equipment that depends on the information contained in the 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. - View Dependent Claims (17, 18, 19)
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Specification