公开(公告)号：US20240007039A1

公开(公告)日：2024-01-04

申请号：US18255201

申请日：2021-11-20

Applicant: Danfoss Editron Oy

Inventor： Antti TARKIAINEN ,  Juha TOIKKA ,  Tapani SIIVO ,  Mikko PIISPANEN ,  Mika BJÖRKHOLM

IPC: H02P25/18 ,  H02K3/28

CPC classification number: H02P25/182 ,  H02K3/28 ,  H02P27/06

Abstract: A converter (101) for driving an electric machine whose stator windings are changeable to be in a low-speed configuration or in a high-speed configuration includes a converter stage (102) for supplying stator voltages to the stator windings, and a control system (103) that controls the stator windings to be in the low-speed configuration or in the high-speed configuration. The control system deactivates the converter stage during a change between the low-speed configuration and high-speed configuration and limits torque of the electric machine so that a torque limit is higher when the stator windings are in the low-speed configuration than when the stator windings are in the high-speed configuration. As the torque limit is changed when the number of series connected turns of the stator windings is changed, unwanted current transients can be reduced.

公开(公告)号：US20240087797A1

公开(公告)日：2024-03-14

申请号：US18519149

申请日：2023-11-27

Applicant: DANFOSS EDITRON OY

Inventor： Mikko PIISPANEN ,  Matti ISKANIUS ,  Tero JARVELAINEN ,  Anssi SUURONEN

IPC: H01F27/28 ,  H01F27/02 ,  H01F27/16 ,  H01F27/22 ,  H01F27/245 ,  H01F27/32 ,  H01F37/00

CPC classification number: H01F27/2895 ,  H01F27/025 ,  H01F27/16 ,  H01F27/22 ,  H01F27/245 ,  H01F27/324 ,  H01F37/00

Abstract: An inductive device comprises a toroidal core and at least one electric conductor wound around the toroidal core and constituting at least one winding. The inductive device comprises a cooling element constituting a cylindrical cavity that contains the toroidal core and the electric conductor so that the axial direction of the toroidal core is parallel with the axial direction of the cylindrical cavity. The shape of the cylindrical cavity and the cross-section of the electric conductor are adapted to match each other to improve heat transfer from the electric conductor to the wall of the cylindrical cavity so that a wall of the cylindrical cavity is provided with axially directed grooves occupied by portions of the electric conductor on an outer perimeter of the winding.