Cutting machine, especially a circular saw

Patent metadata

Field	Value
Publication number	US-9937570-B2
Application number	US-201615190872-A
Country	US
Kind code	B2
Filing date	Jun 23, 2016
Priority date	Jun 30, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A cutting machine includes a cutting element for cutting material, a motor for driving the cutting element to rotate and a housing for containing the motor. The motor includes a rotor sleeve being formed with a receiving chamber, a motor shaft being capable of rotating together with the rotor sleeve, a stator core at least partially contained in the receiving chamber, stator coils wound around the stator core, and a stator bracket for fixing the stator core. The stator core is formed with a through hole for the motor shaft to pass there through, the stator coils are located outside the through hole and, the motor shaft is capable of rotating relative to the stator core.

First claim

What is claimed is:

1. A cutting machine, comprising:
a cutting element for cutting a material;
a motor for driving the cutting element to rotate; and
a housing for containing the motor,
wherein the motor comprises:
a rotor sleeve formed with a receiving chamber;
a motor shaft capable of rotating together with the rotor sleeve;
a stator core at least partially contained in the receiving chamber;
stator coils wound around the stator core; and
a stator bracket for fixing the stator core, and

wherein the stator core is formed with a through hole for the motor shaft to pass there through, the stator coils are located outside the through hole, and the motor shaft is capable of rotating relative to the stator core.

2. The cutting machine of claim 1 , wherein when the cutting machine is unloaded, a ratio between number of turns per minute of the motor shaft and a rotation radius of the cutting element is in a range that greater than or equal to 100 mm −1 and less than or equal to 250 mm −1 .

3. The cutting machine of claim 2 , wherein a ratio between two rotation speeds of the motor shaft and the cutting element is in a range that greater than or equal to 2 and less than or equal to 3.

4. The cutting machine of claim 1 , wherein when the cutting machine is unloaded, a ratio between number of turns per minute of the cutting element and a rotation radius of the cutting element is in a range that greater than or equal to 45 mm −1 and less than or equal to 90 mm −1 .

5. The cutting machine of claim 1 , wherein a maximum output torque of the cutting element is in a range that is greater than 0.6 Nm and less than or equal to 1.2 Nm.

6. A circular saw, comprising:
a saw blade for cutting a material;
a motor for driving the saw blade to rotate; and
a housing for containing the motor,
wherein the motor comprises:
a rotor sleeve formed with a receiving chamber;
a motor shaft capable of rotating together with the rotor sleeve;
a stator core at least partially contained in the receiving chamber;
stator coils wound around the stator core; and
a stator bracket for fixing the stator core, and

wherein the stator core is formed with a through hole for the motor shaft to pass there through, the stator coils are located outside the through hole, and the motor shaft is capable of rotating relative to the stator core.

7. The circular saw of claim 6 , wherein when the circular saw is unloaded, a ratio between number of turns per minute of the motor shaft and a rotation radius of the saw blade is in a range that greater than or equal to 100 mm −1 and less than or equal to 250 mm −1 .

8. The circular saw of claim 7 , wherein a ratio between two rotation speeds of the motor shaft and the saw blade is in a range that greater than or equal to 2 and less than or equal to 3.

9. The circular saw of claim 6 , wherein when the circular saw is unloaded, a ratio between number of turns per minute of the motor shaft and a rotation radius of the saw blade is in a range that greater than or equal to 45 mm −1 and less than or equal to 90 mm −1 .

10. The circular saw of claim 6 , wherein a maximum output torque of the circular saw is in a range that is greater than 0.6 Nm and less than or equal to 1.2 Nm.

Assignees

• Chervon Hk Ltd

Inventors

• Chen Shibo
• Fu Xiangqing
• Wang Hongwei

Classifications

• B23D47/12 Primary

  of drives for circular saw blades · CPC title

• B27B9/00

  Portable power-driven circular saws for manual operation (details or components, e.g. handles, casings, of portable power-driven tools not particularly related to the operation performed B25F5/00) · CPC title

• H02K7/145

  Hand-held machine tool · CPC title

• H02K7/14

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title