公开(公告)号：US20210273590A1

公开(公告)日：2021-09-02

申请号：US17256042

申请日：2019-04-05

Applicant: ABB Schweiz AG

Inventor： Mehanathan Pathmanathan ,  Pedro Rodriguez ,  Chenjie Lin ,  Ghanshyam Shrestha ,  Tuomas Janhunen ,  Pasi Paloheimo

IPC: H02P9/30 ,  H02P9/00

Abstract: A method of performing de-excitation of a brushless synchronous machine having a stator; and a rotor including: a field winding, an exciter armature, a rectifier having thyristors, the rectifier having input terminals connected to the exciter armature and output terminals connected to the field winding, a field discharge resistor connected in series with the field winding, and a bypass switch connected in parallel with the field discharge resistor, the bypass switch being operable between a closed state in which the field discharge resistor is bypassed, and an open state, wherein the method including: a) controlling the thyristors to fire only during a negative half-cycle of the armature voltage waveforms, and b) controlling the bypass switch to obtain the open state from the closed state to thereby discharge a field winding current through the field discharge resistor.

公开(公告)号：US11046404B2

公开(公告)日：2021-06-29

申请号：US16527465

申请日：2019-07-31

Applicant: ABB Schweiz AG

Inventor： Chenjie Lin ,  Colin E Tschida ,  Ghanshyam Shrestha ,  Steven Englebretson

IPC: B63H5/10 ,  H02K16/02 ,  H02K49/10

Abstract: A drive system is provided for propelling a ship through water. The drive system has two propellers. The propellers are coaxial so that one propeller engages the incoming water first, and the other propeller engages the water after it passes through the first propeller. The drive system has a stator that causes a first rotor to rotate. The first rotor is connected to, the first propeller to cause the first propeller to rotate. The first rotor also causes a second rotor to rotate. The second rotor is connected to the second propeller to cause the second propeller to rotate.

公开(公告)号：US10700578B2

公开(公告)日：2020-06-30

申请号：US15858043

申请日：2017-12-29

Applicant: ABB Schweiz AG

Inventor： Ghanshyam Shrestha ,  Chenjie Lin ,  Mehanathan Pathmanathan ,  Pedro Rodriguez

IPC: H02K11/042 ,  H02K3/20 ,  H02K21/04 ,  H02K19/28

Abstract: Unique systems, methods, techniques and apparatuses of an exciterless synchronous generator are disclosed. One exemplary embodiment is an exciterless synchronous generator comprising a stator, a rotor, and a startup excitation system. The stator includes a set of stator windings. The rotor includes an energy harvest winding, a DC power supply including a DC bus and coupled to the energy harvest winding, and a field winding coupled to the DC power supply. The startup excitation system comprises one of a magnetic field generation system structured to generate a magnetic field received by the energy harvest winding in response to a rotation of the rotor, wherein the magnetic field is converted to DC power with the DC power supply and transmitted to the field winding; or a rotor DC power source including and diode coupled in series across the DC bus.

公开(公告)号：US10608508B2

公开(公告)日：2020-03-31

申请号：US15718568

申请日：2017-09-28

Applicant: ABB Schweiz AG

Inventor： Chenjie Lin ,  Ghanshyam Shrestha ,  Jing Xu ,  Joonas Puukko

IPC: H02K11/042 ,  H02K19/28 ,  H02K19/12 ,  H02K11/33 ,  H02K3/20 ,  H02K11/04

Abstract: Unique systems, methods, techniques and apparatuses of an exciterless synchronous machine are disclosed. One exemplary embodiment is a salient pole rotor for an electric machine including one set of pole pairs including a first, second, and third pole pair; a field winding; a set of energy harvest windings, each winding mounted to each of the plurality of pole pairs and structured to receive a harmonic component of AC power from a stator; and a DC power supply structured to receive the harmonic component from the set of energy harvest windings, convert the harmonic component to DC power, and output the DC power to the field winding. The set of energy harvest windings are arranged in a first sequence on the first pole pair, a second sequence on the second pole pair, and a third sequence on the third pole pair, and each sequence is different.

公开(公告)号：US20190207492A1

公开(公告)日：2019-07-04

申请号：US16223971

申请日：2018-12-18

Applicant: ABB Schweiz AG

Inventor： Chenjie Lin ,  Matthew Henricksen ,  Ghanshyam Shrestha ,  Elio Alberto Perigo

IPC: H02K21/02 ,  H02K1/27 ,  H02K21/14

CPC classification number: H02K21/028 ,  H02K1/276 ,  H02K21/14

Abstract: A permanent magnet motor is provided that produces variable magnetic flux. The motor may include two different types of permanent magnets with different coercivities. The magnetic state of one of the magnets may be altered during use. In one state, the effective magnetic flux of the motor is greater, and in another state, the effective magnetic flux of the motor is less.