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Electric motor with brakes

A technology of electric motors and brake arms, which is applied in the field of electric motors and can solve problems such as power reduction of electric motors

Inactive Publication Date: 2006-10-11
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the no-load speed, measures must be taken, which will cause a drop in the power of the motor, which is also undesirable

Method used

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  • Electric motor with brakes
  • Electric motor with brakes
  • Electric motor with brakes

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Embodiment Construction

[0018] FIG. 1 shows a cross-sectional view of an electric motor 10 having a stator 11 and a rotor 12 . The figure shows only the upper half of the stator, which forms a pair of poles, one of which is designated 14. The pole 14 has a pole shoe 15 oriented inward from the yoke 13 towards the circumference of the rotor, which ends on both sides with pole corners 16 , 17 . Between the pole corners 16 , 17 and the yoke 13 there are slots 18 , 19 in which the stator windings 20 are placed. Thus, the stator winding 20 surrounds the pole piece 15 .

[0019] In the stator 11 , a radially extending free space 21 is formed in the region of the pole shoes 15 , in which a braking element 23 of a braking device 22 is inserted. The braking element fills the inner space of the pole piece 15 between the pole corners 16 , 17 and thus acts as a part of the pole piece 15 . The braking element 23 forms lateral separating surfaces 24 , 25 penetrating radially with respect to the stator 11 and a ...

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PUM

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Abstract

The invention relates to an electric motor, in which at least one pole shoe (15) belonging to the stator (11) is provided with a braking element (23) movable in the direction of the rotor (12), the braking element being movable in its A brake lining (31) is provided at the place fitted on the rotor (12). The invention proposes that the brake lining (31) has substantially the same magnetic permeability as the pole piece (15) and the brake component (23) placed therein, whereby the brake lining (31) forms a very small Reluctance, which prevents the motor from running too high without load.

Description

technical field [0001] The invention relates to an electric motor, in particular an electric motor for an electric power tool, the stator of which has at least one pole shoe covering a partial area of ​​the rotor, wherein a brake element which is movable in the direction of the rotor is provided in the pole shoe. The moving part is provided with a brake lining on the part where it can fit on the rotor. Background technique [0002] Especially in electric power tools such as angle grinders, circular saws and the like, after the electric motor has been switched off, due in part to the rotational energy stored in the rotating power tool, there is a long inertia time. [0003] A machine tool that is still turning after it has been switched off can present a risk of injury to the user. In order to reduce the coasting time of a power tool, it is known from DE 198 60 396 A1 - as described in its introduction - to provide a braking element in the electric motor which acts on the ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K7/12F16D49/00F16D65/06F16D65/14H02K7/102
CPCF16D2121/22H02K7/125
Inventor 汉斯-格奥尔格·赫尔佐克
Owner ROBERT BOSCH GMBH