Energy saving system and method for devices with rotating or reciprocating masses
First Claim
1. A non-transitory computer-readable storage medium storing instructions which, when executed by a device having an electric motor and a processor, cause the processor to:
- provide voltage and current to the electric motor;
observe a phase angle between the voltage and the current provided to the electric motor;
obtain a control line having a plurality of target phase angles that correspond to load conditions placed on the electric motor;
compare the observed phase angle with a corresponding target phase angle obtained from the control line; and
reduce the voltage provided to the electric motor when the observed phase angle is greater than the target phase angle.
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Abstract
A system and method are provided for saving energy for an electric motor having periodic load variations by reducing the supply voltage to the motor during an open loop mode. The motor and system will speed up, allowing the natural kinetic energy of the cyclic motion to perform part of the pumping action. A closed loop controller computes information from the observed phase angle between the voltage and current supplied to the motor. By reducing the supply voltage to the motor, the observed phase angle may be reduced to a target phase angle value. By allowing some current flow, primarily of a reactive nature, an observable feedback parameter may be used in the closed loop control system as an indication of the load condition, to which the closed loop motor controller may react, supplying power when needed, such as in the energy consumption mode.
348 Citations
20 Claims
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1. A non-transitory computer-readable storage medium storing instructions which, when executed by a device having an electric motor and a processor, cause the processor to:
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provide voltage and current to the electric motor; observe a phase angle between the voltage and the current provided to the electric motor; obtain a control line having a plurality of target phase angles that correspond to load conditions placed on the electric motor; compare the observed phase angle with a corresponding target phase angle obtained from the control line; and reduce the voltage provided to the electric motor when the observed phase angle is greater than the target phase angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A non-transitory computer-readable storage medium storing instructions which, when executed by a device having an electric motor and a processor, cause the processor to:
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provide voltage and current to the electric motor, the current having a real component and a reactive component; observe a phase angle between the voltage and the current provided to the electric motor; obtain a control line having a plurality of target phase angles that correspond to load conditions placed on the electric motor; compare the observed phase angle with a corresponding target phase angle obtained from the control line; and reduce the voltage provided to the electric motor when the observed phase angle is greater than the corresponding target phase angle and decreasing the current real component to substantially zero while maintaining the current reactive component at a value greater than zero. - View Dependent Claims (14, 15, 16)
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17. A non-transitory computer-readable storage medium storing instructions which, when executed by a device having an electric motor and a processor, cause the processor to:
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provide voltage and current to the electric motor; observe a phase angle between the voltage and the current provided to the electric motor; obtain a control line having a plurality of target phase angles that correspond to load conditions placed on the electric motor; compare the observed phase angle with a corresponding target phase angle obtained from the control line; and reduce the voltage provided to the electric motor when the observed phase angle is greater than the target phase in order to decrease a braking action of the electric motor. - View Dependent Claims (18)
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19. A non-transitory computer-readable storage medium storing instructions which, when executed by a device having an electric motor and a processor, cause the processor to:
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provide voltage and current to the electric motor; control the electric motor in a closed loop mode; obtain a control line having a plurality of target phase angles that correspond to load conditions placed on the electric motor; and reduce the voltage provided to the electric motor in the closed loop mode in order to drive an observed phase angle of the electric motor to a corresponding target phase angle obtained from the control line. - View Dependent Claims (20)
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Specification