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Integral high-speed permanent-magnet brushless direct-current motor for electric tool

A permanent magnet brushless DC and electric tool technology, which is applied in the direction of electric components, electrical components, electromechanical devices, etc., can solve the problems of troublesome assembly, high process requirements, and high price, and achieve stable operation, simple process, and convenient assembly. Effect

Active Publication Date: 2015-03-04
上海电动工具研究所(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing technology, the speed of the permanent magnet brushless DC motor is generally low, while the brushless DC motor used in electric tools requires a high speed.
Moreover, the brushless DC motors used in electric tools all adopt a split structure, and the positioning of the stator and the rotor are all placed in the casing. This structure is troublesome to assemble, requires high technology, and is expensive.
In addition, when the motor is running at high speed, there will be friction between the stator and the rotor, which will easily affect the overall sense and stability of the electric tool

Method used

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  • Integral high-speed permanent-magnet brushless direct-current motor for electric tool

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Embodiment Construction

[0024] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0025] The installation size of a high-speed integrated permanent magnet brushless DC motor used in electric tools provided by the present invention is exactly the same as that of a standardized integral permanent magnet brushed DC motor. On the basis of tool products, it can be applied to the needs of different customers, including the rotor 1 and the stator 2 sleeved outside the rotor 1. It is characterized in that the front end cover 4 and the rear The end cover 5 and the screw rod 6 pass through the front end cover 4 and the rear end cover 5 and cooperate with the nut 7 to assemble the rotor 1, the stator 2, the front end cover 4 and the rear end cover 5 into a whole, and the fan blade 3 is located at the rear end cover 5 or the front end cover 4, the blades 3 are connected to the rotor 1 to rotate with the rotor 1.

[0026] ...

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PUM

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Abstract

The invention discloses an integral high-speed permanent-magnet brushless direct-current motor for an electric tool, and the motor comprises a rotor and a stator sleeved outside the rotor, wherein front and rear ends of the rotor and stator are respectively provided with a front end cover and a rear end cover, a screw passes through the front end cover and the rear end cover and fits with nuts to integrally assemble the rotor, the stator, the front end cover and the rear end cover, and a fan blade is arranged outside the rear end cover or the front end cover and connected with the rotor to be together rotated. The motor has the advantages of simple process, easy assembly, excellent cooling effect, steady operation and long service life, and a solenoid coil cannot be in short circuit due to being damaged.

Description

technical field [0001] The invention relates to a permanent magnet brushless DC motor, in particular to a high-speed integral permanent magnet brushless DC motor used for electric tools. Background technique [0002] Due to its high efficiency, low noise, long life, high safety, and environmental protection, brushless DC motors are widely used in industrial and civil fields. However, in the prior art, the rotational speed of the permanent magnet brushless DC motor is generally low, while the rotational speed of the brushless DC motor used in electric tools is required to be high. Moreover, the brushless DC motors used in electric tools all adopt a split structure, and the positioning of the stator and the rotor are all placed in the casing. This structure is cumbersome to assemble, requires high technology, and is expensive. In addition, when the motor is running at high speed, there will be friction between the stator and the rotor, which will easily affect the overall sen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K29/00H02K9/06H02K1/27H02K1/28H02K5/04H02K5/20
Inventor 王典罗选强王永生
Owner 上海电动工具研究所(集团)有限公司
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