US1998580A - System for eliminating radio interference - Google Patents

System for eliminating radio interference Download PDF

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Publication number
US1998580A
US1998580A US658032A US65803233A US1998580A US 1998580 A US1998580 A US 1998580A US 658032 A US658032 A US 658032A US 65803233 A US65803233 A US 65803233A US 1998580 A US1998580 A US 1998580A
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US
United States
Prior art keywords
housing
condensers
condenser
casing
brushes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US658032A
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English (en)
Inventor
Heuberger Josef Friedrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Corp
Original Assignee
Electrolux Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electrolux Corp filed Critical Electrolux Corp
Application granted granted Critical
Publication of US1998580A publication Critical patent/US1998580A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus

Definitions

  • This invention melates to a system for eliminating radio interference and more particularly to asystem for preventing the propagation of high frequency disturbances by dynamo electric 5 machines.
  • One object of the invention is to prevent electric motors of household appliances from interfering with radio reception.
  • Another object is to provide a protective means for portable household appliances such as vacuum cleaners, floor polishers, and the like.
  • a further object is to provide a simple, safe and a convenient device for the above purpose.
  • the invention also consists in certain new and original features of construction and combinations of parts hereinafter set forth and claimed.
  • Fig. 1 is a diagrammatic representation of one embodiment of the invention.
  • Figs. 2 to 7 inclusive are diagrammatic representations illustrating various modifications thereof.
  • l designates a housing which may consist of, for example, the housing of a household appliance such as a vacuum cleaner, floor polisher or the like.
  • a housing which may consist of, for example, the housing of a household appliance such as a vacuum cleaner, floor polisher or the like.
  • an electric motor having an armature l'l brushes l2 and field coils l3 which are shown, by way of example, as connected'in series relationship.
  • the motor is connected to a line l by which current is supplied thereto.
  • a suitable switch 25 may be included for controlling the operation of the motor.
  • An impedance such as a pair of condensers I4, is connected across the brushes l2 of the motor and is enclosed in a metallic casing I! which is adapted to provide an electrostatic shield.
  • a second impedance such as a condenser is, is connected across the line l5 and across the field coils l3.
  • This condenser I6 is also enclosed in a suitable metallic casing l8 similar to the casing II. It is to be understood that casings l1 and I8 may be insulated from each other and March 7, 1932 are insulated from the housing III.
  • the condensers I which are connected across the brushes [2 will be hereinafter designated as brush condensers whereas the condenser l6 which is connected across the line l5 will be designated as the field or line condenser.
  • the condensers l4 and I6 are connected to casings l1 and I8 in various ways, as will be hereinafter described, either directly or through pro- .tective condensers, to form a protective circuit which is adapted toconstitute a high frequency by-pass, or a high frequency filter to prevent high frequency disturbances due, for example, to improper commutation or sparking atthe brushes, from being transmitted to the line or to the ex terior, and thereby interfering with radio reception.
  • thecondensers M are connected in series and the midpoint thereof is connected to the housing l8 of the line condenser I6.
  • Fig. 2 shows the mid-point of the brush condenser l4 connected to the casing I! which surrounds said condenser.
  • the casings I'! and I8 are interconnected and the brush condenser I4 is connected to the casing H.
  • the casing 18 is grounded externally of housing I0 througha protective condenser l 9 and the brush condenser I4 is connected to said casing l8.
  • the brush condenser I4 is connected to the casing l8 through a protective condenser 28 and the line condenser I6 is formed in two sections which are interconnected, the mid-point being connected to the casing ll through a protective condenser 29.
  • condensers l4 and I6 are both enclosed in a single metallic casing 20 to which the condenser ll is connected through a protective condenser 2
  • Figs. 4-7 it is to be understood that one or more of the protective condensers l9, 2
  • Specific embodiments have been disclosed for purposes of illustration only. In any event the easings I! and I8 constitute electrostatic shields and the various condensers together with the casings El and i8, provide filter means for the purpose above specified.
  • the housing Hi is electrically insulated from Ml parts of the motor circuit and that the protective condensers are grounded to separate casings which in themselves are electrically insulated from the housing id.
  • This arrangement eliminates the danger of the operator coming in contact with the charged part-of the apparatus and receiving an electrical shock therefrom.
  • the embodiments of Figs. l-3and 5-? also eliminate the necessity for a third wire connecting the apparatus to ground. This latter feature is of importance in connection with portable apparatus of the type above specified which would otherwise require a three wire cable and would require a special type of wall socket for grounding purposes.
  • the filter circuit may be installed as a unit, no part of which extends without the main housing and no part of which is exposed to accidental contact. Furthermore the device has been found particularly efficacious for the purpose specified.
  • one of said condensers being grounded to one of said casings through a protective condenser.
  • a housing adapted to form a part of a utility, an electric motor mounted within said housing, said motor having a commutator, brushes and field windings and current supply connections, said motor being electrically insulated from said housing, a pair of condensers, a separate metallic casing enclosing each of said condensers, each casing being electrically insulated from said housing, one of said condensers being connected across the brushes of said motor, the other of said condensers being connected across said current supply connections and means grounding one of said condensers to one of said casings.
  • a housing adapted to form a part of a utility, an electric motor mounted within said housing, said motor having a commutator, brushes, field windings and current supply connections, said motor being electrically insulated from said housing, a pair of condensers, a separate metallic casing enclosing each of said condensers, each casing being electrically insulated from said housing, one of said condensers being connected across the brushes of said motor, the other of said condensers being connected across said current supply connections and means grounding one of said condensers to one of said casings, and means grounding said last casing externally of said housing.
  • a housing adapted to form a part of a utility, an electric motor mounted within said housing, said motor having a commutator, brushes, field windings and current supply connections, said motor being electrically insulated from said housing, a pair of condensers, a separate metallic casing enclosing each of said condensers, each casing being electrically insulated from said housing, one of said condensers being connected across the brushes of said motor, the other of said condensers being connected across said current supply connections and means grounding one of said condensers to one of said casings and means grounding said last casing externally of said housing, said last means including a protective condenser.
  • a housing adapted to form a part of a utility, an electric motor mounted within said housing, said motor having a commutator, brushes associated therewith, field windings and current supply connections, said motor being electrically insulated from said housing, a pair of condensers, a metallic casing enclosing said condensers, said casing being electrically insulated from said housing, one of said condensers being connected across the brushes of said motor, the other of said condensers being connected across said current supply connections and means ounding one of said condensers to said casing.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Machiner (AREA)
  • Motor Or Generator Current Collectors (AREA)
US658032A 1932-03-07 1933-02-23 System for eliminating radio interference Expired - Lifetime US1998580A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE405113X 1932-03-07

Publications (1)

Publication Number Publication Date
US1998580A true US1998580A (en) 1935-04-23

Family

ID=6421875

Family Applications (1)

Application Number Title Priority Date Filing Date
US658032A Expired - Lifetime US1998580A (en) 1932-03-07 1933-02-23 System for eliminating radio interference

Country Status (4)

Country Link
US (1) US1998580A (enrdf_load_stackoverflow)
FR (1) FR751163A (enrdf_load_stackoverflow)
GB (1) GB405113A (enrdf_load_stackoverflow)
NL (1) NL37205C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2724062A (en) * 1951-06-25 1955-11-15 Marchant Calculators Inc Electrical circuit for suppressing interference

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2724062A (en) * 1951-06-25 1955-11-15 Marchant Calculators Inc Electrical circuit for suppressing interference

Also Published As

Publication number Publication date
GB405113A (en) 1934-02-01
NL37205C (enrdf_load_stackoverflow)
FR751163A (fr) 1933-08-28

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