公开(公告)号：US20230387840A1

公开(公告)日：2023-11-30

申请号：US18317589

申请日：2023-05-15

Applicant: ABB Schweiz AG

Inventor： Sina Khamehchi ,  Joni Heikkilä ,  Mikko Kostiainen

IPC: H02P9/10

CPC classification number: H02P9/10 ,  H02P2207/05 ,  H02P21/30

Abstract: An apparatus for a drive for driving an externally excited synchronous motor. The apparatus includes means for performing the following. The apparatus causes the drive to operate in a primary operating mode for achieving unity power factor. The apparatus monitors stator flux linkage load angle, stator flux linkage and torque references. In response to the stator flux linkage load angle reference, in a steady state, reaching or exceeding a pre-defined maximum allowed stator flux linkage load angle for steady state operation, the apparatus causes the drive to operate in a stator flux assistance operating mode. In the stator flux assistance operating mode, an increased stator flux linkage for allowing operation with the pre-defined maximum allowed stator flux linkage load angle with unity or maximized sub-unity power factor is used as the stator flux linkage reference.

公开(公告)号：US20240243680A1

公开(公告)日：2024-07-18

申请号：US18405105

申请日：2024-01-05

Applicant: ABB Schweiz AG

Inventor： Joni Heikkilä ,  Sina Kuunsäde ,  Mikko Kostiainen

IPC: H02P27/05 ,  H02P23/14

CPC classification number: H02P27/05 ,  H02P23/14 ,  H02P2207/05

Abstract: An apparatus for a drive for an externally excited synchronous machine. The apparatus sets a value for a stator flux linkage reference so as to enable operation in a linear region of a d-axis magnetizing inductance without saturation. The apparatus causes the drive to drive the externally excited synchronous machine with a speed within a linear modulation range using said value. During the driving, the apparatus adjusts a rotor excitation current reference to determine a minimum-load value of a rotor excitation current and causes increasing or decreasing of the rotor excitation current until a stator current is within a pre-defined range. Then, the apparatus determines operating values for the stator and rotor excitation currents and calculates a rotor-to-stator reduction factor based on the minimum-load and operating values of the rotor excitation current, the operating value of the stator current and the value for the stator flux linkage reference.