Motor for electric power tools and electric power tool

Patent metadata

Field	Value
Publication number	US-11632017-B2
Application number	US-202016828690-A
Country	US
Kind code	B2
Filing date	Mar 24, 2020
Priority date	Mar 29, 2019
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

A motor for electric power tools according to an embodiment includes: a rotor having a rotational shaft; a stator having a coil to rotate the rotor; a first substrate mounting a sensor element to detect a rotational position of the rotor; and a second substrate mounting a switching element to change, based on a result of detection by the sensor element, a conducting direction in which a current flows with respect to the coil. The first substrate and the second substrate are arranged side by side along, and intersect at right angles with, the rotational shaft.

First claim

The invention claimed is:

1. A motor for electric power tools, the motor comprising:
a rotor having a rotational shaft;
a stator having a coil configured to rotate the rotor;
a first substrate mounting a sensor element thereon, the sensor element being configured to detect a rotational position of the rotor;
a second substrate mounting a switching element thereon, the switching element being configured to change, based on a result of detection by the sensor element, a conducting direction in which a current flows with respect to the coil; and
an insulator being configured to be fixed to the first substrate and the second substrate; and
two bearings being configured to support the rotational shaft rotatably,
the first substrate and the second substrate being arranged side by side along, and intersecting at right angles with, the rotational shaft,
the first substrate and the second substrate being arranged within a range defined by a total length of the rotational shaft,
the first substrate and the second substrate being arranged between the two bearings.

2. The motor for electric power tools of claim 1 , wherein the first substrate and the second substrate are arranged to face each other.

3. The motor for electric power tools of claim 1 , wherein the first substrate is arranged between the stator and the second substrate in a direction in which the rotational shaft extends.

4. The motor for electric power tools of claim 1 , wherein the insulator is configured to be fixed to the stator.

5. The motor for electric power tools of claim 1 , wherein
the insulator includes: a first mounting portion configured to mount the first substrate thereon; and a second mounting portion configured to mount the second substrate thereon, and
the first mounting portion and the second mounting portion are arranged at two different levels in the direction in which the rotational shaft extends.

6. The motor for electric power tools of claim 1 , further comprising a heat sink, wherein the second substrate is fixed onto the insulator via the heat sink.

7. The motor for electric power tools of claim 1 , wherein
each of the first substrate and the second substrate includes a connecting member to be electrically connected to an external device, and
the respective connecting members of the first and second substrates are both arranged on one side of the rotational shaft in a direction perpendicular to the rotational shaft.

8. The motor for electric power tools of claim 7 , wherein the respective connecting members of the first and second substrates are connected to the external device in two different connecting directions.

9. The motor for electric power tools of claim 1 , wherein the first substrate is arranged in an area forming part of a circumference of the rotational shaft.

10. The motor for electric power tools of claim 1 , wherein when measured along the radius of the rotational shaft, the first substrate and the second substrate have mutually different dimensions.

11. The motor for electric power tools of claim 1 , further comprising a terminal member secured to the insulator, wherein
the second substrate is electrically connected to the coil via the terminal member.

12. An electric power tool comprising:
the motor for electric power tools of claim 1 ; and
an electric power tool body configured to house the motor for electric power tools therein.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Murui Itaru
• Muramatsu Masari
• Muto Motoharu
• Kitamura Kota

Classifications

• H02K7/145 Primary

  Hand-held machine tool · CPC title

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• H02K11/33 Primary

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• H02K11/215

  Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements · CPC title

• B25B21/02

  with means for imparting impact to screwdriver blade or nut socket · CPC title