Multiple motor operation using solar power

a solar power and motor technology, applied in solar heat collectors, solar heat systems, solar heat collectors, etc., can solve the problems of motor damage, motor inrush current dependence, and the shutdown of the entire vfd drive if not controlled, so as to achieve optimum power performance and effective use of available power
US20070074716A1Inactive Publication Date: 2007-04-05ENTECH SOLAR
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
ENTECH SOLAR
Publication Date
2007-04-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

A solar powered system controls multiple motors directly from a single solar power source with a single variable frequency drive (VFD). A control system selectively connects and disconnects individual motors as solar power varies so that the available power can be used effectively and some of the motors can be kept operating rather than shutting down the entire system. The control system includes a detection circuit for detecting the solar array voltage, and a selection circuit for providing shutoff control signals to individual motors based on the solar array voltage and preselected motor shutoff priority criteria.
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Description

RELATED APPLICATIONS

[0001] This application claims priority of Provisional Application Ser. No. 60 / 723,268 filed Oct. 3, 2005.BACKGROUND OF INVENTION

[0002] 1. Field of the Invention

[0003] The invention relates generally to solar powered systems, and more particularly to the operation of multiple motors using solar power.

[0004] 2. Description of Related Art

[0005] Solar power is being increasingly used as an alternate energy source. One application is to provide power to operate motors. Most motors are AC motors. The DC output of a solar panel array is converted to AC power by a variable frequency drive (VFD). In many applications, it is desirable to drive an array of multiple motors from a single VFD connected to a solar power source.

[0006] Controlling multiple motors from a single variable frequency drive (VFD) has been done but always from an AC grid voltage which is a stable power source capable of supplying the required power. When used with solar power, caution must be tak...

Claims

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