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Method for operating a converter and converter

A frequency converter, switching frequency technology, applied in the control system, electrical components, AC motor control and other directions, can solve the problem of unstable motor speed, difficult to accept long-term work and other problems

Active Publication Date: 2016-06-22
BAUMULLER NURNBERG GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of switching frequency is perceptible to the human ear, making it difficult for the operator of the drive and / or motor to accept prolonged work
In the case of relatively low switching frequency, it is easy to form harmonics in the alternating current, so that the speed of the motor is not constant.

Method used

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  • Method for operating a converter and converter
  • Method for operating a converter and converter
  • Method for operating a converter and converter

Examples

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Embodiment Construction

[0035] figure 1 An electric machine 2 is shown, which is operated by means of a frequency converter 4 . Motor 2 is three-phase. In other words, the motor 2 is energized by means of three lines 6 , each of which is in electrical contact with a bridge branch 8 of the frequency converter. The positive pole 10 is in electrical contact with the negative pole 12 of the frequency converter 4 by means of the bridge branches 8 connected in parallel, which essentially have a constant DC voltage U of 1200 V high between them. This is ensured by means of intermediate circuit capacitors 14 which are connected in parallel to the individual bridge branches. Each bridge branch here includes two semiconductor switches 16 connected in series, each in the form of an IGBT. As an alternative to this, a freewheeling diode is connected in parallel to the IGBT. Contacting with the respective line 6 takes place between the two semiconductor switches of the respective bridge branch 8 .

[0036] Ea...

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Abstract

The invention relates to a method for operating a converter and the converter. The method comprises following steps: loading a semiconductor switch (16) of a frequency changer according to switching frequency (fS) to a voltage signal or a current signal (22) modulated by pulse. The switching frequency (fS) makes choices according to an external parameter (58). The frequency changer has the semiconductor switch (16).

Description

technical field [0001] The invention relates to a method for operating a frequency converter with semiconductor switches and to a frequency converter with semiconductor switches. Background technique [0002] A frequency converter usually has a rectifier side, an intermediate circuit and an inverter side. The rectifier side is electrically connected to a power supply network which conducts an alternating voltage, for example a three-phase alternating voltage. In this case, the supply network conducts an alternating current, wherein alternating current is understood not only as a single-phase alternating current, but also as a multiphase alternating current, for example a three-phase alternating current (three-phase alternating current), ie The so-called alternating current. The frequency of the alternating voltage supplying the frequency converter is constant and usually equal to 50 Hz or 60 Hz. The alternating voltage is rectified by means of a rectifier and fed into the...

Claims

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Application Information

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IPC IPC(8): H02P27/04
CPCH02P27/045H02P27/085
Inventor 安德烈亚斯·包米勒安德拉斯·莱尔凯什
Owner BAUMULLER NURNBERG GMBH
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