公开(公告)号：US11942890B2

公开(公告)日：2024-03-26

申请号：US17479185

申请日：2021-09-20

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Satoshi Narumi ,  Minoru Kurosawa ,  Takeshi Ohtsuki

IPC: H02P6/182 ,  H02P6/20

CPC classification number: H02P6/182 ,  H02P6/20 ,  H02P2203/03

Abstract: The magnetic pole position of the rotor is estimated with high accuracy at the initial start of a three-phase motor of the sensorless system. Semiconductor device for driving and controlling the three-phase motor of the sensorless system have a detector connected to the three-phase output nodes of the inverter circuit and the virtual neutral point (or neutral point), and detecting a voltage generated in the output node of the non-energized phase of the three-phase. Controller applies the initial drive voltage by the inverter circuit to any two phases of the three-phase motor based on the estimated position of the magnetic pole of the rotor in the stop state. Controller estimates the position of the rotor based on a difference voltage detected by the detector in a driving voltage applying period and a regeneration period immediately after or immediately before the driving voltage applying period.

公开(公告)号：US10924672B2

公开(公告)日：2021-02-16

申请号：US16193923

申请日：2018-11-16

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Shunya Yamane ,  Mitsumasa Murakami ,  Takeshi Ohtsuki ,  Mamoru Morotomi ,  Akihiro Nakatani ,  Akihisa Nomura ,  Aritsune Nagamura

IPC: H04N5/232

Abstract: An operation part calculates a shake amount of an imaging apparatus in accordance with a first operation system or a second operation system on the basis of an output signal of a sensor detecting an acceleration or angular velocity to determine a camera-shake correction amount correcting the shake amount. The operation part calculates the output signal of the sensor or a value obtained by integrating an integrated signal of the output signal of the sensor as a shake amount. The operation part includes an imperfect integrator. An operation system setting part sets an operation system of the operation part on the basis of the shake amount calculated by the operation part. In the second operation system, the operation system setting part increases a cut-off frequency of the imperfect integrator more than in the first operation system.