公开(公告)号：US20170370626A1

公开(公告)日：2017-12-28

申请号：US15543287

申请日：2016-01-27

Applicant: DENSO CORPORATION

Inventor： Teruaki OHYAMA ,  Yuji KAMIYA ,  Tomoyuki SUMI ,  Akitomo YAMANAKA ,  Koji SAKAI

IPC: F25B31/00 ,  F04D27/00 ,  F04D25/06 ,  F25B49/02

CPC classification number: F25B31/006 ,  B60H1/3205 ,  B60H1/3225 ,  B60H2001/3257 ,  B60H2001/3272 ,  B60H2001/3292 ,  F04B39/06 ,  F04D25/06 ,  F04D27/004 ,  F25B5/04 ,  F25B6/04 ,  F25B49/005 ,  F25B49/022 ,  F25B2400/0409 ,  F25B2400/0411 ,  F25B2500/08 ,  F25B2600/021 ,  F25B2600/0253 ,  F25B2700/21154 ,  F25B2700/21156

Abstract: An air conditioning apparatus includes an electric compressor, an inverter, a temperature detection element, and an ECU. The electric compressor compresses a refrigerant drawn from a refrigerant intake port and discharges the refrigerant from a refrigerant discharge port. The inverter is integrated with the electric compressor so as to be cooled by the drawn refrigerant, and operates the electric compressor according to a control signal. The temperature detection element detects a temperature of the inverter. The ECU outputs a control signal to control the inverter. The ECU performs any one or both of a control for reducing a self-cooling amount of the electric compressor and a control for increasing a self-heat generation amount of the inverter with respect to the inverter when the temperature detected by the temperature detection element is lower than a predetermined reference temperature.

公开(公告)号：US20180202442A1

公开(公告)日：2018-07-19

申请号：US15744184

申请日：2016-07-28

Applicant: DENSO CORPORATION

Inventor： Shinji NAKAMOTO ,  Koji SAKAI ,  Akihiro IMURA ,  Akitomo YAMANAKA

IPC: F04C28/06 ,  F25B1/04 ,  F25B1/10 ,  F25B49/02 ,  H02P6/30

Abstract: A controller that controls an electric compressor, which is mounted to a vehicle and configures a two-stage compression refrigeration cycle device, has a deceleration section, an operation stop section, and a restart section. The deceleration section reduces a rotational speed of an electric motor by controlling an AC current which is output to the electric motor, when a two-stage compression mode, in which an intermediate-pressure refrigerant flows into the electric compressor from an intermediate-pressure port, is performed and an operation stop request to stop the electric compressor is made. The operation stop section stops the electric motor after the deceleration section reduces the rotational speed of the electric motor. The restart section restarts the electric compressor when the operation stop request is canceled after the operation stop section stops the electric compressor.

公开(公告)号：US20180175766A1

公开(公告)日：2018-06-21

申请号：US15576317

申请日：2016-05-19

Applicant: DENSO CORPORATION

Inventor： Koji SAKAI ,  Akitomo YAMANAKA

IPC: H02P23/00 ,  H02P27/08 ,  H02P29/68 ,  F25B13/00 ,  F25B31/02

CPC classification number: H02P23/009 ,  F25B13/00 ,  F25B31/026 ,  H02P3/18 ,  H02P27/08 ,  H02P29/68

Abstract: A motor driving device for a motor having a stator and a rotor rotationally driven by an input of an AC voltage includes: an inverter circuit having multiple units corresponding to multiple phases respectively, each unit having a pair of a switching element and a reflux diode connected in anti-parallel to the switching element; and a control device controlling the inverter circuit to convert a DC voltage into the AC voltage and to output the AC voltage to the stator coil. The control device includes: a field weakening control unit adjusting the AC voltage to control a magnetic field of the stator coil to weaken a field magnetic flux of the rotor; and a regenerative current control unit switching an anti-regenerative side switching element to flow a regenerative current when the AC voltage stops while the field weakening control unit performs the field weakening control.