公开(公告)号：US11984827B2

公开(公告)日：2024-05-14

申请号：US18548136

申请日：2022-03-25

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Tomoki Nakata ,  Takayuki Miyajima ,  Nobuo Hayashi

IPC: H02P21/05 ,  B60L50/51 ,  F25B31/02 ,  H02P21/22 ,  H02P27/06 ,  H02P27/12 ,  B60K1/00

CPC classification number: H02P21/05 ,  B60L50/51 ,  F25B31/02 ,  H02P21/22 ,  H02P27/12 ,  B60K1/00 ,  H02P2207/05 ,  H02P2207/055

Abstract: A motor control apparatus configured to convert an input power supplied from a power supply to an output alternating-current power having a predetermined voltage and a predetermined frequency is provided. The motor control apparatus includes an inverter circuit configured to supply the output alternating-current power to a motor, and is configured to perform a control to suppress an amplitude of a first harmonic component that occurs synchronously with a rotation rate of the motor in a power input into the motor to be lower than or equal to a predetermined value and to suppress an amplitude of a second harmonic component that occurs in an electromagnetic exciting force of the motor at a same frequency as the first harmonic component to be lower than the amplitude of the second harmonic component in a case of the amplitude of the first harmonic component being suppressed to a minimum.

公开(公告)号：US20220014059A1

公开(公告)日：2022-01-13

申请号：US17486644

申请日：2021-09-27

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Tomoki Nakata ,  Takeshi Araki

IPC: H02K1/27 ,  H02K1/28 ,  H02K15/03

Abstract: An electric motor includes a rotor, and a stator. The rotor has a core, shaft rotatably supported on the core only on one axial side, and plurality of permanent magnets forming magnetic poles. In a case in which each of the magnetic poles is divided into rotation and reverse direction sides relative to a magnetic pole center, the rotor core has magnetic saturation promoting portion by which a half portion on the rotation direction side of at least one of the magnetic poles each including a corresponding one of the permanent magnets is likely to be magnetically saturated. The magnetic saturation promoting portion is provided in a more radially outward direction than the permanent magnet. Shapes of the half portions on the rotation and reverse direction sides are asymmetric about a first straight line passing through the pole center of the magnetic pole and an axial center of the rotor.