Method for a network synchronization of a permanently excited three-phase machine comprising a soft starter which comprises thyristors

A method for grid synchronization of a permanent-magnet three-phase machine including a soft starter, the soft starter including thyristors, and mechanical bypass contacts for bypassing the thyristors during grid operation, the method comprising:

• generating a first control signal, the switching-on of the mechanical bypass contacts being initiated by the first control signal once a criterion has been reached during runup of the permanent-magnet three-phase machine using the soft starter, a time of generation of the first control signal representing an actuation time of the mechanical bypass contacts;
• generating, via a second control signal, firing pulses for the thyristors within a time period, the time period ranging from the actuation time to a contact time of the mechanical bypass contacts;
• and
• operating the permanent-magnet three-phase machine during grid operation via the mechanical bypass contacts, wherein a respective firing pulse for a respective thyristor, of the thyristors, is generated upon a phase current measurement revealing that a current intensity in an associated phase falls below a threshold value.