US 12,438,490 B2
Motor drive system
Yasuo Ono, Tokyo (JP); Kazuhito Nakamura, Tokyo (JP); Michael Haider, Zurich (CH); Dominik Bortis, Zurich (CH); Miric Spasoje, Zurich (CH); and Walter Johann Kolar, Zurich (CH)
Assigned to NABTESCO CORPORATION, Tokyo (JP)
Filed by NABTESCO CORPORATION, Tokyo (JP)
Filed on Oct. 23, 2023, as Appl. No. 18/492,044.
Application 18/492,044 is a continuation of application No. PCT/JP2022/018502, filed on Apr. 22, 2022.
Claims priority of application No. 2021-072501 (JP), filed on Apr. 22, 2021; and application No. 2021-151794 (JP), filed on Sep. 17, 2021.
Prior Publication US 2024/0056014 A1, Feb. 15, 2024
Int. Cl. H02M 1/12 (2006.01); H02K 11/00 (2016.01); H02P 27/06 (2006.01)
CPC H02P 27/06 (2013.01) [H02K 11/0094 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A motor drive system comprising:
a first inverter connected to one end of an open-end winding of a three-phase motor, an input voltage from a single-phase AC power source being rectified into a rectified voltage and input to the first inverter;
a second inverter connected to another end of the open-end winding and including a DC link capacitor; and
a control unit that controls the first inverter so that a first inverter output voltage supplied from the first inverter to the three-phase motor is in phase with a motor current flowing in the three-phase motor, controls the second inverter to supply reactive power to the three-phase motor by making a second inverter output voltage supplied from the second inverter to the three-phase motor orthogonal to the motor current in order to make an instantaneous power supplied from the DC link capacitor to the three-phase motor zero, and also controls the second inverter so that a q-axis component of the second inverter output voltage orthogonal to a d-axis component, which is a magnetic flux direction of the three-phase motor, pulsates in synchronization with the single-phase AC power source.