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Method and assembly for operating synchronous motors

A technology for synchronizing machines and voltages, which is applied to the starter of a single synchronous machine, AC motor control, motor generator/starter, etc., and can solve problems such as failure to start

Active Publication Date: 2014-07-02
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It may therefore not be possible to start, i.e. start, such motors directly at the grid

Method used

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  • Method and assembly for operating synchronous motors
  • Method and assembly for operating synchronous motors
  • Method and assembly for operating synchronous motors

Examples

Experimental program
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Embodiment Construction

[0027] exist figure 1 In , the AC synchronous machine is connected to phases A, B, C of the three-phase grid via a three-phase power controller 4 . Each phase A, B, C is associated with a semiconductor regulator 6, 7, 8 consisting of two anti-parallel thyristors A1, A2, B1, B2, C1, C2. The ignition electrodes of the thyristors A1 , A2 , B1 , B2 , C1 , C2 are connected to a control device 3 , by means of which the ignition signals required for igniting the thyristors A1 , A2 , B1 , B2 , C1 , C2 are supplied. The control device 3 is realized by a microcontroller. Between two phases A, B, C of the grid, e.g. figure 1 A voltage measuring device 5 is connected between the terminals A and B of the electrical network in , at the output of which the electrical network voltage UAB present between these two terminals A and B is provided. For the other two phases there can likewise be additional voltage measuring devices, not shown.

[0028] In one embodiment variant, the control dev...

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PUM

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Abstract

The invention relates to a method for operating a synchronous machine (1) by means of a three-phase power controller (4), which comprises three semiconductor controllers (6, 7, 8) and is connected to a three-phase network, comprising the following steps: determining the phase difference between the magnet-wheel voltage of the synchronous machine (1) and the network voltage of the three-phase network; determining the rotational speed of the rotor of the synchronous machine; determining the phase position of the three-phase network; determining at least some of the stator currents of the synchronous machine (1); determining a decision characteristic number on the basis of an advance calculation of the torque curve in the event of activation of at least two of the semiconductor controllers (6, 7, 8) while taking into account the current values for phase difference, rotational speed, stator current, and phase position; and determining at least one switching time point on the basis of the decision characteristic number, wherein the at least two semiconductor controllers (6, 7, 8) are activated at the switching time point.

Description

technical field [0001] The invention relates to a method for operating a synchronous electric machine and an associated device for operating a synchronous electric machine with a three-phase power controller, an alternating current controller which can be connected to a three-phase power grid and which comprises a semiconductor controller, for example an anti-parallel Thyristor. In this case, in particular, the starting of synchronous machines is involved. Background technique [0002] AC synchronous motors without a starter cage are in principle linked to the frequency of the fed three-phase grid. It may therefore not be possible to start, ie start, such electric machines directly at the grid. More precisely, between the three-phase grid and the synchronous machines a device is required which first enables starting. For this purpose, frequency converters are usually used. The frequency converter consists of a rectifier, an intermediate circuit (-capacitor) and an invert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/52H02P25/02H02P27/02H02P1/46H02P27/18
CPCH02P1/46H02P25/021H02P27/18H02P25/024
Inventor 马塞尔·贝内克
Owner SIEMENS AG