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Variable frequency driver and method for filter capacitor fault detection

A fault detection circuit and driver technology, applied in capacitor testing, power supply testing, measuring electrical variables, etc., can solve problems such as increasing the size, cost and complexity of motor drivers

Active Publication Date: 2011-11-30
ROCKWELL AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A failure or other fault condition in the filter capacitor can adversely affect drive operation, and previous systems used pressure relays to detect changes in pressure within the capacitor or monitor three-phase capacitor currents to detect capacitor failure
However, such techniques require additional components and increase the size, cost and complexity of the motor drive

Method used

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  • Variable frequency driver and method for filter capacitor fault detection
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  • Variable frequency driver and method for filter capacitor fault detection

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Embodiment Construction

[0016] Referring now to the drawings, several embodiments or implementations are described below in conjunction with the drawings, wherein like reference numerals are used to indicate like elements throughout the various drawings and wherein the various features are not necessarily drawn to scale. The present disclosure includes the protection of AC filter capacitors in variable frequency drives by detecting the fundamental component at the fundamental frequency (e.g., for European Current or voltage unbalance on 60Hz or 50Hz). The inventors have appreciated that, unlike utility type power converters, variable frequency motor drives provide output voltage and current at multiple frequencies due to the variable frequency nature of the output and the switching operation of the inverter and active rectifier. A simple measurement of the neutral voltage or current in these drives does not allow a reliable identification of fault conditions, since the neutral signal has a number of ...

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PUM

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Abstract

Variable frequency motor drives and methods are presented in which filter capacitor faults are detected by measuring filter neutral node current and / or voltages and detecting changes in the fundamental frequency component of the measured neutral condition at the fundamental frequency of the input power and / or based on input current unbalance.

Description

technical field [0001] The present disclosure relates generally to variable frequency electrical power conversion systems, and more particularly to variable frequency drives (VFDs) and techniques for detecting faults in driving filter capacitors. Background technique [0002] A motor drive is an electrical power conversion system that converts input power from a line-side source into a different form to provide a controlled drive current to the windings of a motor, where the output frequency is variable. VFDs typically include passive or active rectifiers that rectify AC input power to generate DC link power in an intermediate DC circuit. The intermediate DC power is fed to an output inverter which produces a variable frequency single-phase or multi-phase AC output which is used to drive the motor load at controlled speed and torque. VFDs often include filter circuitry at the input and / or load output, which includes filter capacitors. Failure or other fault conditions in f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06H02M5/458G01R31/02
CPCH02M5/4585H02M5/451H02M7/539H02M5/458H02M1/32H02M7/525G01R31/42G01R31/64H02M1/126H02M5/4505
Inventor 肖原纳维德·扎尔加里马尼什·潘德维贾伊·卡特里
Owner ROCKWELL AUTOMATION TECH
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