Back to results
US 10,473,097 B2Granted
System and method for speed control of variable speed pumping systems
AssigneeTigerflow Systems, LLC
InventorsRyan Morris, Minh Truong
Life of this patent
Estimating the term…
Abstract
A system and method for controlling a speed of a pumping system includes a controller, a variable frequency drive connected to the controller, a motor connected to the variable frequency drive, a pump connected to the motor, a set of sensors connected to the motor, the pump, and the controller, and an interface connected to the controller. The controller includes a processor and a memory connected to the processor. A motor control process is saved in the memory and executed by the processor that generates a motor control signal to control the speed of the motor and the pump.
Claims13
A pump system for speed control of variable speed pumping, comprising:
- a controller further comprising a processor;
- a variable frequency drive connected to the controller;
- a motor connected to the variable frequency drive;
- a pump connected to the motor;
- a set of sensors connected to the motor, the pump, and the controller;
- an interface connected to the controller;
- the processor programmed to:
- receive a set of at least two constants from the interface;
- measure an instantaneous pressure from the set of sensors;
- calculate a proportional value based on the set of constants and the instantaneous pressure;
- wherein the proportional value is calculated using a polynomial function that includes at least two values from the set of constants;
- determine a speed adjust value from the proportional value if the proportional value is within a predetermined range;
- generate a motor control signal from the proportional value for the variable frequency drive;
- whereby the variable frequency drive adjusts a speed of the motor based on the motor control signal;
- wherein the processor is further programmed to:
- retrieve a current speed from the set of sensors;
- retrieve the instantaneous pressure from the set of sensors;
- compare the instantaneous pressure to a deadband value;
- determine a new speed from the speed adjust value and the current speed if the instantaneous pressure is beyond the deadband value;
- and,
- send the new speed as the motor control signal to the variable frequency drive;
- wherein the set of at least two constants further comprises a gain, the deadband value, a pressure setpoint, a negative limit, and a positive limit, wherein the negative limit and the positive limit comprise the predetermined range, and wherein the processor is further programmed to:
- compare the proportional value to the negative limit and the positive limit;
- set the negative limit as the speed adjust value if the proportional value is less than the negative limit;
- and,
- set the positive limit as the speed adjust value if the proportional value is greater than the positive limit.
23 more elements
A system for speed control of variable speed pump systems, comprising:
- a controller further comprising a processor;
- a set of pump systems, each pump system of the set of pump systems connected to the controller;
- an interface connected to the controller;
- the processor programmed to:
- receive a set of at least two constants from the interface;
- measure an instantaneous pressure from the set of pump systems;
- calculate a proportional value based on the set of constants and the instantaneous pressure;
- wherein the proportional value is calculated using a polynomial function that includes at least two values from the set of constants;
- determine a speed adjust value from the proportional value if the proportional value is within a predetermined range;
- generate a control signal from the proportional value;
- send the control signal to each pump system of the set of pump systems;
- whereby each pump system of the set of pump systems includes:
- a motor, a pump connected to the motor, and a variable frequency drive to adjust a motor speed based on the control signal;
- wherein the processor is further programmed to:
- retrieve a current speed from a set of sensors;
- retrieve the instantaneous pressure from the set of sensors;
- compare the instantaneous pressure to a deadband value;
- determine a new speed from the speed adjust value and the current speed if the instantaneous pressure is beyond the deadband value;
- and,
- send the new speed as the control signal to the variable frequency drive of a respective pump system;
- wherein the set of constants further comprises a gain, the deadband value, a pressure setpoint, a negative limit, and a positive limit, wherein the negative limit and the positive limit comprise the predetermined range, and wherein the processor is further programmed to:
- compare the proportional value to the negative limit and the positive limit;
- set the negative limit as the speed adjust value if the proportional value is less than the negative limit;
- and,
- set the positive limit as the speed adjust value if the proportional value is greater than the positive limit.
22 more elements
A pump system for speed control of variable speed pumping, comprising:
- a controller further comprising a processor;
- a variable frequency drive connected to the controller;
- a motor connected to the variable frequency drive;
- a pump connected to the motor;
- a set of sensors connected to the motor, the pump, and the controller;
- an interface connected to the controller;
- the processor programmed to:
- receive a set of at least two constants from the interface;
- measure an instantaneous pressure from the set of sensors;
- calculate a proportional value based on the set of constants and the instantaneous pressure;
- wherein the proportional value is calculated using a polynomial function that includes at least two values from the set of constants;
- determine a speed adjust value from the proportional value if the proportional value is within a predetermined range;
- generate a motor control signal from the proportional value for the variable frequency drive;
- whereby the variable frequency drive adjusts a speed of the motor based on the motor control signal;
- wherein the processor is further programmed to:
- retrieve a current speed from the set of sensors;
- retrieve the instantaneous pressure from the set of sensors;
- compare the instantaneous pressure to a deadband value;
- determine a new speed from the speed adjust value and the current speed if the instantaneous pressure is beyond the deadband value;
- and,
- send the new speed as the motor control signal to the variable frequency drive wherein the polynomial function is:
- PV
- =
- Gain
-
- [
- [
- (
- p
- instant
- -
- p
- setpoint
- p
- setpoint
- )
-
- 100
- ]
- 3
- ]
- +
- 100
- deadband
-
- [
- (
- p
- instant
- -
- p
- setpoint
- p
- setpoint
- )
-
- 100
- ]
- -
- 100
- wherein PV is the proportional value,
- wherein psetpoint is the pressure setpoint,
- wherein pinstant is the instantaneous pressure, and
- wherein Gain and deadband from the function are the gain and the deadband from the set of constants.
61 more elements
A system for speed control of variable speed pump systems, comprising:
- a controller further comprising a processor;
- a set of pump systems, each pump system of the set of pump systems connected to the controller;
- an interface connected to the controller;
- the processor programmed to:
- receive a set of at least two constants from the interface;
- measure an instantaneous pressure from the set of pump systems;
- calculate a proportional value based on the set of constants and the instantaneous pressure;
- wherein the proportional value is calculated using a polynomial function that includes at least two values from the set of constants;
- determine a speed adjust value from the proportional value if the proportional value is within a predetermined range;
- generate a control signal from the proportional value;
- send the control signal to each pump system of the set of pump systems;
- whereby each pump system of the set of pump systems includes a variable frequency drive to adjust a motor speed based on the control signal;
- wherein the processor is further programmed to:
- retrieve a current speed from a set of sensors;
- retrieve the instantaneous pressure from the set of sensors;
- compare the instantaneous pressure to a deadband value;
- determine a new speed from the speed adjust value and the current speed if the instantaneous pressure is beyond the deadband value;
- and,
- send the new speed as the control signal to the variable frequency drive of a respective pump system;
- wherein the polynomial function is:
- PV
- =
- Gain
-
- [
- [
- (
- p
- instant
- -
- p
- setpoint
- p
- setpoint
- )
-
- 100
- ]
- 3
- ]
- +
- 100
- deadband
-
- [
- (
- p
- instant
- -
- p
- setpoint
- p
- setpoint
- )
-
- 100
- ]
- 100
- wherein PV is the proportional value,
- wherein psetpoint is the pressure setpoint,
- wherein pinstant is the instantaneous pressure, and
- wherein Gain and deadband from the function are the gain and the deadband from the set of constants.
59 more elements
Dependencies are inferred from the claim text.