Switching device for a wye-delta switch in a multiphase motor

A switching device for a star-delta changeover in a multiphase motor including one motor winding per phase, each motor winding including a motor winding connector pair, the switching device comprising:

• an electromagnetic drive configured to move a drive shaft between first, second, and third defined axial positions;
• for each motor winding, a contact device including a first and a second motor winding connection contact, a phase connection contact, and a movable contact bridge, the movable contact bridge being coupled to the drive shaft and movable using the drive shaft into the three defined axial positions,
• wherein, when the movable contact bridge is in the first defined axial position, the first position arranged axially between the second and third defined axial positions, the movable contact bridge is in an open position in which none of the connection contacts is electrically connected to another one of the connection contacts via the movable contact bridge,
• wherein, when the movable contact bridge is in the second defined axial position, the movable contact bridge is in a star-contact position in which the movable contact bridge electrically connects the phase connection contact to the first motor winding connection contact, and the second motor winding connection contact is electrically connected to the second motor winding connection contacts of all other contact devices via a star contact coupled to the drive shaft, and
• wherein, when the movable contact bridge is in the third defined axial position, the movable contact bridge is in a delta-contact position in which the movable contact bridge electrically connects the phase connection contact to the first and second motor winding connection contacts.