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System for harmonic content correction in power electric circuit, system for electric engine control, and cooling compressor

An electric motor and refrigeration compressor technology, applied in the field of refrigeration compressors, can solve problems such as bulkiness, high energy consumption, and high cost

Active Publication Date: 2017-06-16
EMPRESA BRASILEIRA DE COMPRESSORES SA (EMBRACO)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of the inductor in order to maintain the inductive properties of the inductor even for transient conditions directly affects the inductor core and thus affects the inductor size and energy dissipation
As a result, inductors take up more space in the circuit, making them expensive, bulky and / or very bulky, often making the device economically uneconomical or resulting in higher power consumption

Method used

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  • System for harmonic content correction in power electric circuit, system for electric engine control, and cooling compressor
  • System for harmonic content correction in power electric circuit, system for electric engine control, and cooling compressor

Examples

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example 1

[0034] Example 1 - System for correcting harmonic content of current in a power circuit in a refrigeration compressor

[0035] The invention provides a harmonic content correction system in a power circuit comprising an inductor (L) as a reactive element. The core of the inductor is dimensioned to be reduced, yet meeting the current requirements under normal load conditions. In this embodiment, the maximum engine operating temperature also occurs when the condition is full load or pull down (10). In this embodiment, the inductor (L) receives no current due to the actuation of the switching means (M) protecting the inductor. In this way, the inductor is sized to operate under normal conditions of the variable capacity compressor.

[0036] refer to figure 1 , it will be understood that in this embodiment of the invention, since the grinding system (12), the first reactance element (L), the second reactance element (C p ), the switchgear (M), the control system (10) and the c...

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Abstract

The invention discloses a system for harmonic content correction in a power electric circuit, a system for electric engine control, and a cooling compressor. The invention relates to the field of power electronics and electric engines, and describes a harmonic content correction system in power systems. The invention solves the space and weight problem associated with the core of a harmonic content correction inductor, also providing performance advantages of electric engines, such as higher available voltage at full load and higher rotational speed at full load. The invention is particularly useful in refrigeration compressors. The disclosed harmonic content correction system comprises a switching device (M) associated with a reactive element (L).

Description

technical field [0001] The invention relates to the fields of power electronics and electric motors. More specifically, the present invention describes a system for correcting harmonic content in electric power circuits, a system for controlling electric motors and compressors for refrigeration. The system of the invention provides protection of the reactive component (L) and avoids its oversizing. The invention is particularly useful in the control of electric motors for compressors. Background technique [0002] Currently, various types of electric motors, usually alternators, use devices called frequency converters to control the motor, such as speed control, starting and other parameters. [0003] However, converters have non-linear voltage and current functions, ie they do not follow straight lines. Non-linear elements act on their power networks, polluting them with a large number of low-order harmonics, distorting the power supply and leading to a reduction in powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02P29/50
CPCH02M1/12H02M1/126H02M1/327F25B49/025F25B2600/0253H02P27/06
Inventor E·捷斯克
Owner EMPRESA BRASILEIRA DE COMPRESSORES SA (EMBRACO)
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