Invention Grant
- Patent Title: Method for a network synchronization of a permanently excited three-phase machine comprising a soft starter which comprises thyristors
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Application No.: US17296609Application Date: 2019-11-25
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Publication No.: US11456683B2Publication Date: 2022-09-27
- Inventor: Hauke Nannen , Heiko Zatocil
- Applicant: Siemens Aktiengesellschaft
- Applicant Address: DE Munich
- Assignee: Siemens Aktiengesellschaft
- Current Assignee: Siemens Aktiengesellschaft
- Current Assignee Address: DE Munich
- Agency: Harness, Dickey & Pierce, P.L.C.
- Priority: EP18210695 20181206
- International Application: PCT/EP2019/082384 WO 20191125
- International Announcement: WO2020/114816 WO 20200611
- Main IPC: H02P1/46
- IPC: H02P1/46 ; H02P25/022 ; H02P25/22

Abstract:
A method is for a network synchronization of a permanently excited three-phase machine including a soft starter, including thyristors, and mechanical bypass contacts for bridging the thyristors in the network operation. The method includes generating a first control signal, to initiate switching the mechanical bypass contacts to become conductive, after a criterion is reached while running up the three-phase machine on the soft starter, a time at which the first control signal is generated representing actuation time of the bypass contacts; generating ignition pulses for the thyristors within a time period, running from the actuation time to a contact time of the bypass contacts, using a second control signal; and operating the three-phase machine in the network operation via the bypass contacts. Each ignition pulse for a thyristor is generated when a phase current measurement indicates that the current strength in the assigned phase has fallen below a threshold value.
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