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Open-loop method for controlling power

A technology of control lines and motors, applied in control systems, control generators, vector control systems, etc., to achieve the effect of fast response time and reduced power consumption

Inactive Publication Date: 2012-10-10
ROCKY RES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, motor energy savings are limited to considerably less than theoretically possible
Furthermore, in order to set the controller for maximum energy savings, the set point must be lowered in the field until the motor can no longer operate under the actual load

Method used

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Embodiment Construction

[0041] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. The same reference numbers in different drawings identify the same or similar elements. Also, the following detailed description does not limit the invention. Instead, the scope of the invention is defined by the appended claims and their equivalents.

[0042] The Nola design is a closed-loop phase controller that reduces the voltage on the motor as the load decreases by switching off the AC current for a period of time for each half-wave of the AC sine wave. An improved digital controller design based on Nola's basic approach is described in the most recent U.S. Patent Application No. 11 / 755,627, filed May 30, 2007, the disclosure of which is incorporated by reference in its entirety for all purposes. Incorporated here. The software of this digital controller uses the Nola control principle described above. figure 1 Typical waveforms are shown.

[0043] The ...

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PUM

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Abstract

Aspects of the present invention pertain to a method of power control for an electrical motor using open-loop principles. The method employs a desired control line function that determines hold-off time based on a detected phase lag of a motor drive signal. The motor to be controlled is driven with a motor drive signal at a given load for a first number of cycles to detect the phase lag of the motor drive signal. Controlling for phase lag for a second number of cycles is then accomplished by firing a thyristor according to the phase lag of the motor drive signal. Advantages of the present invention include reduced power consumption of a motor controlled by an embodiment of the inventive method or inventive controller, and faster response time between the detection of load changes on the motor and the issuance of power control signals.

Description

[0001] priority [0002] This non-provisional application is required under 35 U.S.C. § 119(e) of U.S. Provisional Application Nos. 60 / 894,751 filed March 14, 2007, 60 / 894,765 filed March 14, 2007, and October 2007 Priority of 60 / 982,087 filed on the 23rd, the entire contents of these provisional applications are hereby incorporated by reference. technical field [0003] The present invention relates generally to controlling electrical appliances and devices, and more particularly to methods, systems and devices for controlling electric motors to save energy. Background technique [0004] Power factor measures the ratio of average power to apparent power under an electrical load. The power factor ranges from a value of 0 (where the impedance of the load is purely reactive) to 1 (for a purely resistive load). In fact, the power factor of an electrical device varies somewhere between 0 and 1, and the closer the value is to 1, the more efficiently the device consumes energy a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P23/00
Inventor G·I·博亚杰夫
Owner ROCKY RES INC