公开(公告)号：US20150020391A1

公开(公告)日：2015-01-22

申请号：US14155358

申请日：2014-01-15

Applicant: MAKITA CORPORATION

Inventor： Kenji ABE ,  Masayoshi OKUMI ,  Hidenori NAGASAKA ,  Motohiro OMURA ,  Masaaki FUKUMOTO ,  Kenji SHIBATA ,  Nobuyasu FURUI ,  Masanori HIGASHI ,  Kiyoshi AOYAMA

IPC: B23D45/16

CPC classification number: B23D47/12 ,  B24B23/02 ,  B24B47/12 ,  B25F5/008 ,  B25F5/02

Abstract: A hand-held power tool includes a motor having a stator and a rotor, the motor being configured to rotate the rotor at a speed of at least 40,000 rpm, an output shaft directly driven by the rotor, a tool accessory shaft configured to support a tool accessory, and a two-stage speed reducing transmission operably connecting the output shaft to the tool accessory shaft. The two-stage speed reducing transmission is configured to drive the tool accessory shaft at a rate less than the rotor speed, for example, at a rate less than or equal to 37.5% of the rotor speed.

Abstract translation: 一种手持电动工具包括具有定子和转子的电动机，所述电动机构造成以至少40,000rpm的转速旋转所述转子，由所述转子直接驱动的输出轴;工具附件轴， 工具附件，以及将输出轴与工具附件轴可操作地连接的两级减速传动装置。 两级减速传动装置构造成以小于转子速度的速度驱动工具附件轴，例如以小于或等于转子速度的37.5％的速率。

公开(公告)号：US20160141939A1

公开(公告)日：2016-05-19

申请号：US14918026

申请日：2015-10-20

Applicant: MAKITA CORPORATION

Inventor： Kiyoshi AOYAMA

IPC: H02K11/00

CPC classification number: H02K11/0021 ,  H02K5/225 ,  H02K7/145 ,  H02K11/215 ,  H02K21/22

Abstract: The present application discloses an electric working machine. The electric working machine includes: a motor including a rotor; a sensor board including a magnetic sensor for detecting magnetic variation due to rotation of the rotor; and a housing which contains the motor and the sensor board. in the electric working machine, the sensor board does not cover an entire circumference of the rotor. In the electric working machine, the sensor board has a portion covering the rotor, and a portion not covering the rotor.

Abstract translation: 本申请公开了一种电动加工机。 电动加工机包括：电动机，包括转子; 传感器板，包括用于检测由于转子的旋转引起的磁变化的磁传感器; 以及包含电动机和传感器板的壳体。 在电动加工机中，传感器板不覆盖转子的整个圆周。 在电动加工机中，传感器基板具有覆盖转子的部分和不覆盖转子的部分。

公开(公告)号：US20210091640A1

公开(公告)日：2021-03-25

申请号：US16970726

申请日：2019-03-01

Applicant: MAKITA CORPORATION

Inventor： Kiyoshi AOYAMA

IPC: H02K11/215 ,  H02K1/27 ,  H02K7/14 ,  H02K21/16 ,  B25F5/00

Abstract: A vibration driver drill as an electric power tool includes a brushless motor that includes a rotor and a sensor circuit board that detects a rotation of the rotor. The rotor includes a tubular rotor core and four permanent magnets held in the rotor core so as to extend in an axial direction of the rotor core. The sensor circuit board is adjacent to a front-end part (first end portion) of the rotor core. The rotor core is provided with a recessed groove on a side surface outward between the mutually adjacent permanent magnets. The recessed groove extends from the front-end part in the axial direction of the rotor core without reaching a rear-end part (second end portion) facing the front-end part.

公开(公告)号：US20160141932A1

公开(公告)日：2016-05-19

申请号：US14887652

申请日：2015-10-20

Applicant: MAKITA CORPORATION

Inventor： Kiyoshi AOYAMA ,  Masanori HIGASHI ,  Takashi MOMOSE

IPC: H02K3/28 ,  H02K3/12 ,  H02K5/08

CPC classification number: H02K3/28 ,  H02K3/18 ,  H02K7/145 ,  H02K21/22

Abstract: The present application discloses an electric working machine. The electric working machine includes a motor including a stator. The stator includes: a stator core haring a plurality of tooth portions radially extending along a radial direction; and a first coil, a second coil, and a third coil wound on the tooth portions. A start end of the first coil and a finish end of the second coil, a start end of the second coil and a finish end of the third coil, and a start end of the third coil and a finish end of the first coil are led out within a range of 200 degrees from the stator.

Abstract translation: 本申请公开了一种电动加工机。 电动加工机包括具有定子的马达。 定子包括：定子芯，其沿着径向方向径向延伸的多个齿部; 以及缠绕在所述齿部上的第一线圈，第二线圈和第三线圈。 第一线圈的起始端和第二线圈的终端，第二线圈的起始端和第三线圈的终端，以及第三线圈的起始端和第一线圈的终端被引导 在距离定子200度的范围内。

公开(公告)号：US20210083603A1

公开(公告)日：2021-03-18

申请号：US17013977

申请日：2020-09-08

Applicant: MAKITA CORPORATION

Inventor： Kiyoshi AOYAMA ,  Hitoshi SUZUKI

IPC: H02P3/20 ,  H02P3/22

Abstract: An electric working machine may include a brushless motor and a motor controller. The motor controller may include three upper switching elements, three lower switching elements, and a control unit. The control unit may be configured to execute a short-circuit braking operation for applying a braking force to the brushless motor by bringing the three upper switching elements into a non-conductive state and bringing the three lower switching elements into a conductive state. The control unit may be configured to start the short-circuit braking operation at a predetermined timing. When the short-circuit braking operation is started at the predetermined timing, polarities of induced voltages of first to third phase terminals of the brushless motor are reversed by a time when an electrical angle of the brushless motor increases by 180 degrees from the start of the short-circuit braking operation.

公开(公告)号：US20180013329A1

公开(公告)日：2018-01-11

申请号：US15582902

申请日：2017-05-01

Applicant: MAKITA CORPORATION

Inventor： Kiyoshi AOYAMA

IPC: H02K3/28 ,  H02K7/14 ,  H02K3/12

CPC classification number: H02K3/28 ,  H02K3/12 ,  H02K7/145 ,  H02K21/22

Abstract: An electric power tool includes a brushless motor as a driving source. The brushless motor includes a stator and a rotor. The stator includes coils wound around in three phases. In a wire winding method of the coil of the stator, when the number of slots per phase is N, the number of series of the coils per phase is A, and the number of parallel of the coils per phase is B, a relation of N=A×B (note that, N is a natural number of 3 or more and 10 or less, A is a natural number of 1 or more, and B is a natural number of 2 or more) is satisfied.