US 11,711,042 B2
Motor drive system
Grzegorz Popek, Birmingham (GB); and Stephen Minshull, Bromsgrove (GB)
Assigned to HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Dec. 15, 2021, as Appl. No. 17/551,360.
Claims priority of application No. 20275191 (EP), filed on Dec. 23, 2020.
Prior Publication US 2022/0200503 A1, Jun. 23, 2022
Int. Cl. H02P 27/14 (2006.01); H02P 27/06 (2006.01)
CPC H02P 27/06 (2013.01) 16 Claims
OG exemplary drawing
 
1. A motor drive system comprising:
an input portion arranged to receive a DC input voltage across first and second conductors;
an inverter connected across the first and second conductors, said inverter being arranged such that, in a normal mode of operation, the inverter receives the DC input voltage and generates an AC drive voltage therefrom;
a motor connected to the inverter, said motor being arranged such that, in the normal mode of operation, the motor receives the AC drive voltage; and
a first switch connected along the first conductor between the input portion and the inverter, wherein the first switch is a normally-open switch;
a damping controller comprising a second switch and a damping means connected in series between the first and second conductors, wherein the second switch is a normally-closed switch;
wherein the damping controller is arranged such that:
when the motor drive system is operated in the normal mode of operation, the first switch is closed and the second switch is open;
when the motor drive system is operated in a damping mode of operation, the first switch is open and the second switch is closed; and
wherein the second switch is controlled with a control signal having a variable duty cycle.