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Rfi suppression system and method of mounting for DC cordless tools

A hand-held tool, PCB board technology, used in the field of electric motors

Inactive Publication Date: 2012-05-02
INGERSOLL RAND CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of RFI suppression achieved by known designs is often limited by the size constraints imposed on the inductor and capacitor components

Method used

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  • Rfi suppression system and method of mounting for DC cordless tools
  • Rfi suppression system and method of mounting for DC cordless tools
  • Rfi suppression system and method of mounting for DC cordless tools

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Embodiment Construction

[0019] Although the invention has been shown and described herein with reference to particular embodiments, the invention is not intended to be limited to the details shown. Rather, various modifications may be made in the details within the scope of equivalents of the claims without departing from the invention.

[0020] will refer to Figure 1-4 The suppression circuit board 10 according to the first exemplary embodiment of the present invention will be described. exist figure 1 , an exemplary battery powered hand tool 100 , such as an impact wrench, is shown with its clamshell housing component 110 removed to show a DC motor 113 configured to drive the tool 100 . Although an impact wrench is shown, the present invention may be utilized in conjunction with any other electric hand tool. The switch 112 is electrically connected between a power source 111 such as a battery (not shown) and a motor 113 . In this embodiment, the connections are made through the motor voltage t...

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PUM

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Abstract

A hand tool RFI suppression system comprising a DC motor having a conductive housing, a power supply and a suppression circuit board supporting at least one suppression assembly and at least one ground circuit electrically coupled to the suppression assembly. The suppression circuit board is mounted to the motor housing with the at least one suppression assembly electrically coupled in parallel between the power supply and the DC motor and the ground circuit is electrically coupled to the motor housing. A method of suppressing RFI in a power hand tool is also provided.

Description

technical field [0001] The present invention relates to electric motors, more particularly to power circuits in electric motors, and more particularly to DC motors with components for suppressing radio frequency interference. Background technique [0002] An electric motor includes a stator and a rotor that rotate about a central axis in response to opposing magnetic fields between the stator and rotor. The opposing magnetic field is usually induced by the current flowing in the lead windings in the stator and rotor. Thus, the electric motor converts electrical energy into mechanical energy in a shaft attached to the rotor. [0003] Electrical power is provided to the motor through electrical conductors connected to an external power supply such as a battery or AC power lines. It is advantageous to provide a stable power supply to certain electric motors. For example, direct current (DC) motors require a stable DC input with substantially no AC component. Power circuits ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K11/02
CPCH02K11/026H03H1/0007H02K7/145
Inventor W·E·希克斯
Owner INGERSOLL RAND CO
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