US 12,278,576 B2
Electric motor drive device
Hirotaka Sato, Tokyo (JP)
Assigned to TMEIC Corporation, Chuo-ku (JP)
Appl. No. 18/040,666
Filed by TMEIC Corporation, Chuo-ku (JP)
PCT Filed Aug. 24, 2020, PCT No. PCT/JP2020/031813
§ 371(c)(1), (2) Date Feb. 6, 2023,
PCT Pub. No. WO2022/044070, PCT Pub. Date Mar. 3, 2022.
Prior Publication US 2023/0308036 A1, Sep. 28, 2023
Int. Cl. H02P 21/22 (2016.01); H02P 21/34 (2016.01); H02P 27/08 (2006.01)
CPC H02P 21/22 (2016.02) [H02P 21/34 (2016.02); H02P 27/08 (2013.01); H02P 2205/01 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An electric motor drive device comprising:
an electric motor having a plurality of windings;
a main circuit configured to transform power of an alternating current (AC) power supply into AC power and supply the AC power to each of the plurality of windings;
a current sensor configured to detect a load current flowing through each of the plurality of windings; and
a control unit configured to control the main circuit on the basis of a current value detected by the current sensor,
wherein the control unit controls an amount of power to be supplied from the main circuit to the electric motor on the basis of an amplitude of the load current associated with detection of an undervoltage state of the AC power supply in a state in which the main circuit uses a conversion rule in which an index value for the amplitude of the load current flowing through the plurality of windings is defined.