US 12,323,081 B1
Drive device, fluid utilization device, and air conditioner
Yuki Taniyama, Tokyo (JP); Kenji Takahashi, Tokyo (JP); Yuichi Shimizu, Tokyo (JP); and Yasuhiko Wada, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/613,495
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jul. 9, 2019, PCT No. PCT/JP2019/027196
§ 371(c)(1), (2) Date May 9, 2022,
PCT Pub. No. WO2021/005725, PCT Pub. Date Jan. 14, 2021.
Int. Cl. H02P 1/54 (2006.01); F24F 11/88 (2018.01); H02P 5/00 (2016.01); H02P 5/46 (2006.01); H02P 5/50 (2016.01); H02P 21/18 (2016.01); H02P 21/22 (2016.01)
CPC H02P 5/50 (2013.01) [F24F 11/88 (2018.01); H02P 21/18 (2016.02); H02P 21/22 (2016.02)] 12 Claims
OG exemplary drawing
 
1. A drive device comprising:
a power converter to supply power to a first synchronous motor and a second synchronous motor connected in parallel;
a first current detector to detect a first current flowing through the first synchronous motor;
a second current detector to detect a second current flowing through the second synchronous motor;
a first magnetic pole position identifier to identify a first magnetic pole position of a rotor of the first synchronous motor;
a second magnetic pole position identifier to identify a second magnetic pole position of a rotor of the second synchronous motor;
a subtractor to obtain an angular difference using the first magnetic pole position and the second magnetic pole position, the angular difference being a difference between the magnetic pole positions of the rotors of the first synchronous motor and the second synchronous motor;
a magnetic flux current command determiner to determine a magnetic flux current command based on the second current detected by the second current detector;
a magnetic flux current command compensator to adjust an absolute value of the magnetic flux current command based on the angular difference; and
a controller to control the power converter using a torque current command, the magnetic flux current command with the absolute value adjusted by the magnetic flux current command compensator, the first current, and the first magnetic pole position.