Method for electrically connecting a converter to an electrical machine

Patent metadata

Field	Value
Publication number	US-2016197572-A1
Application number	US-201314654612-A
Country	US
Kind code	A1
Filing date	Nov 25, 2013
Priority date	Dec 20, 2012
Publication date	Jul 7, 2016
Grant date	—

Abstract

A method for electrically connecting a converter to an electrical machine supplied with current by the converter by closing a separate electrical connection between the converter and the machine. The connection includes multiple phases. In order to close the electrical connection without causing undue wear to the material, at least two phases of the connection are closed at different times.

First claim

1 - 10 . (canceled)

11 . A method for electrically connecting a converter to an electrical machine to be supplied by the converter, the method which comprises:
starting from a disconnected state of the electrical connection with a plurality of phases between the converter and the electrical machine; and closing at least two of the plurality of phases of the connection at mutually different times.

12 . The method according to claim 11 , wherein, in the disconnected state, all of the phases of the electrical connection are open and the closing step comprises closing all of the phases individually with a temporal offset.

13 . The method according to claim 11 , which comprises closing at least two phases at a zero crossing of a setpoint current of the electrical machine in the respective said phases.

14 . The method according to claim 11 , which comprises closing a first phase and a second phase together and then closing a third phase thereafter.

15 . The method according to claim 14 , which comprises closing the first and second phases outside a zero crossing of a setpoint current thereof and closing the third phase at a zero crossing of the setpoint current thereof

16 . The method according to claim 14 , wherein, in the case of the first and second phases closed first, a sum of the two integrals over a magnitude of the differences between the setpoint current and the actual current becomes minimal.

17 . The method according to claim 14 , which comprises, closing the second phase to be closed at a zero crossing of the phase which immediately follows a zero crossing of the phase closed first.

18 . The method according to claim 11 , which comprises closing the three phases of the connection at immediately successive zero crossings.

19 . A machine system, comprising:
an electrical machine; a converter for converting an input voltage into a machine voltage having a plurality of phases; a connection-closing switch having a dedicated and individually actuable connection-closing element for at least two of the plurality of phases; and a control unit for switching said converter, said control unit being configured to individually actuate said connection-closing elements for closing the individual phases.

20 . The machine system according to claim 19 , wherein each of said connection-closing elements contains a thyristor.

Assignees

• Siemens Ag

Inventors

• Stuetzle Thorsten

Classifications

• H02P27/06 Primary

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• H02P1/46

  for starting an individual synchronous motor {(H02P27/04 takes precedence)} · CPC title

• H02P1/26 Primary

  for starting an individual polyphase induction motor · CPC title

• H02P1/029

  Restarting, e.g. after power failure · CPC title