公开(公告)号：US20150160271A1

公开(公告)日：2015-06-11

申请号：US14413648

申请日：2013-06-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hiroshi Yoshida ,  Masataka Kanda ,  Takuya Kagawa ,  Kenji Okada ,  Atsushi Nakamura

IPC: G01R19/00 ,  G01R33/06

CPC classification number: G01R19/0092 ,  G01R15/18 ,  G01R15/185 ,  G01R15/186 ,  G01R19/165 ,  G01R33/06

Abstract: A current detection device includes: a core to be disposed in the vicinity of a conductor as a detection target; a winding wound around the core; an excitation unit configured to apply an excitation signal, having a magnitude and a direction that change at a constant period, to the winding; a magnetic flux detection unit (comparator and averaging circuit) configured to detect a magnetic flux generated in the core due to current flowing through the conductor; and an adder unit configured to add a feedback signal to the excitation signal such that the magnetic flux detected by the magnetic flux detection unit is cancelled.

Abstract translation: 电流检测装置包括：芯片，设置在作为检测对象的导体附近; 缠绕在芯上的绕组; 激励单元，被配置为将具有以恒定周期变化的幅度和方向的激励信号施加到所述绕组; 磁通量检测单元（比较器和平均电路），其被配置为检测由于电流流经所述导体而在所述磁芯中产生的磁通量; 以及加法器单元，被配置为向激励信号添加反馈信号，使得由磁通检测单元检测到的磁通被消除。

公开(公告)号：US11876408B2

公开(公告)日：2024-01-16

申请号：US17428922

申请日：2019-11-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Mitsumasa Mizuno ,  Akito Nakamura ,  Koichiro Esaka ,  Kenji Okada

IPC: H02K1/276 ,  H02K7/14 ,  H02K21/16

CPC classification number: H02K1/2773 ,  H02K7/145 ,  H02K21/16

Abstract: An electric tool includes a motor. The motor includes a stator core and a rotor. The rotor rotates with respect to the stator core. The rotor includes: a rotor core having a circular cylindrical shape; a plurality of permanent magnets; and an output shaft. The output shaft is held inside the rotor core. The plurality of permanent magnets are arranged as spokes around a center of the rotor core.