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Electric motor including stator and rotor

A technology of motors and rotors, applied in the field of motors, can solve problems such as waste removal, reduction of motor functional capabilities, and magnetic material shedding

Active Publication Date: 2014-11-05
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A disadvantage of this prior art is that by removing material from the rotor position magnets cracks can be produced on said magnets or parts of the magnets can come off due to the brittleness of the magnetic material
The functional capability of the motor may be reduced by cracks produced in this way
Furthermore, chips can be produced during this material removal, which have to be removed from the rotor in a complex manner

Method used

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  • Electric motor including stator and rotor
  • Electric motor including stator and rotor
  • Electric motor including stator and rotor

Examples

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Embodiment Construction

[0029] figure 1 An exemplary hand power tool 100 is shown with an electric motor 110 according to one specific embodiment. The hand power tool 100 illustratively has a tool housing 120 with a handle 130 and a tool receptacle 140 and is mechanically and electrically connected, for example, to a battery pack 150 for grid-independent current supply.

[0030] Hand-held power tool 100 is designed here as an example as an accumulator screwdriver. However, it should be pointed out that the invention is not restricted to battery-drivers, but rather can be used in different electric tools, wherein, for example, in hammer drills, screwdrivers, drill drivers, impact drills, saws The electric motor 110 can be used in machines, milling machines, grinding machines, garden tools, etc., regardless of whether the power tool can be operated from the battery pack 150 or is dependent on the power grid.

[0031] An electric motor 110 , supplied with current from battery pack 150 , is arranged i...

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PUM

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Abstract

An electric motor includes a stator, and a rotor which has a rotor shaft. At least one rotor position magnet is disposed on the rotor shaft, and is configured to provide a magnetic signal that can be evaluated, upon a rotation of the rotor shaft, at least for the purpose of determining a respective rotor position of the rotor. At least one carrier is disposed in a rotationally fixed manner on the rotor shaft, and is connected to the at least one rotor position magnet. The carrier includes at least one opening configured to compensate imbalance of the rotor.

Description

technical field [0001] The invention relates to an electric motor with a stator and a rotor with a rotor shaft on which at least one rotor position magnet is arranged for providing a magnetic signal capable of is evaluated at least for determining the corresponding rotor position of the rotor. Background technique [0002] Such electric motors are already known in the prior art with a stator and a rotor, in which the rotor has rotor position magnets designed in the manner of magnetic rings for detecting rotational speed signals. The rotor position magnet is fixed on the rotor shaft of the rotor in a non-rotatable manner. To compensate for the unbalance of the rotor, material is removed at defined points of the rotor, for example at the rotor position magnets. [0003] A disadvantage of this prior art is that, by removing material from the rotor position magnets, cracks may develop on said magnets or parts of the magnets may fall off due to the brittleness of the magnetic m...

Claims

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Application Information

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IPC IPC(8): H02K11/00B25F5/00
CPCH02K7/145H02K1/30H02K11/0021H02K1/27H02K11/215H02K7/04
Inventor F·韦勒P·纳迪希K·登格勒D·龙巴赫B·克勒
Owner ROBERT BOSCH GMBH