WO2006018599A1 - Reduction d'ondulations a l'aide d'un filtre comprenant un condensateur et une reactance inductive d'un moteur a induction - Google Patents

Reduction d'ondulations a l'aide d'un filtre comprenant un condensateur et une reactance inductive d'un moteur a induction Download PDF

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Publication number
WO2006018599A1
WO2006018599A1 PCT/GB2005/003049 GB2005003049W WO2006018599A1 WO 2006018599 A1 WO2006018599 A1 WO 2006018599A1 GB 2005003049 W GB2005003049 W GB 2005003049W WO 2006018599 A1 WO2006018599 A1 WO 2006018599A1
Authority
WO
WIPO (PCT)
Prior art keywords
inductive reactance
induction motor
motor
arrangement according
filter
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.)
Ceased
Application number
PCT/GB2005/003049
Other languages
English (en)
Inventor
Simon Clark
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.)
Kenwood Ltd
Kenwood Marks Ltd
Original Assignee
Kenwood Ltd
Kenwood Marks Ltd
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 Kenwood Ltd, Kenwood Marks Ltd filed Critical Kenwood Ltd
Publication of WO2006018599A1 publication Critical patent/WO2006018599A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/26—Power factor control [PFC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/15—Power factor correction [PFC] circuit generating the DC link voltage for motor driving inverter

Definitions

  • This invention relates to electrical circuit arrangements, and it relates more particularly to such arrangements including induction motors. It relates especially to such arrangements wherein an induction motor is driven by an alternating current power source, and wherein at least one further component, and/or further circuitry of the arrangement is driven by direct current derived by rectification of the alternating current.
  • Such arrangements are used, for example, in domestic electrical appliances, where the induction motor drives a fan used to cool a second motor (the main drive motor of the appliance) which is driven by the direct current.
  • a second motor the main drive motor of the appliance
  • An arrangement of this kind is described in EP-A- 0584116; an advantage attributed to the arrangement being that, as the second motor is driven harder, the operational speed of the induction motor, and thus the cooling effect of the fan, automatically increases.
  • the present invention may be applied to arrangements in which, instead of (or in addition to) a second motor, the direct current is used to drive (for example) a circuit having components, such as power transistors, that require cooling.
  • the invention aims to address at least one of the foregoing issues and according to the invention there is thus provided a circuit arrangement including an induction motor capable of being driven by an alternating current power source, rectifier means for rectifying the alternating current to generate direct current, at least one electrical device or component driven by the direct current, and filter means for reducing unwanted ripple, wherein said filter means includes an inductive reactance attributable to the induction motor.
  • a capacitor is provided, either in series with the inductive reactance or in shunt therewith, to create a tuned filter with said inductive reactance.
  • the said inductive reactance comprises the entire lumped inductive reactance exhibited by the induction motor, and the capacitative reactance of the capacitor is variable, so as to permit trimming of the filter to allow for changes in the inductive reactance attributable to differing operational conditions.
  • said at least one electrical device or component driven by the direct current comprises a second motor and, in some such circumstances, the second motor comprises the main driving motor of a domestic appliance, and is so located physically in relation to the induction motor as to be cooled by a fan carried on the shaft of the induction motor.
  • the second motor is disposed within a housing that is suitably vented and formed with ducting or other passageways to efficiently convey cooling air from the fan towards the second motor, and to convey heated air away therefrom.
  • the rectifier circuit powers electrical circuitry that incorporates components, such as power transistors, that would benefit from cooling, or which might otherwise be usefully associated with the provision of the induction motor.
  • Such power transistors as aforesaid may be power transistors associated with thermal control circuits in a toaster.
  • the induction motor itself comprises the prime motor driver of an electrical domestic appliance, and the electrical circuitry comprises speed and pulse control circuitry for the appliance.
  • the invention also encompasses domestic electrical appliances including circuit arrangements as aforesaid.
  • Figure 1 is a diagram showing a classic equivalent circuit for an induction motor
  • Figure 2 is a schematic diagram showing a circuit arrangement in accordance with one example of the invention. It is well known from induction motor theory that the induction motor can be represented by an equivalent circuit of the general kind shown in Figure 1. In accordance with the principle of the invention, inductive reactance associated with the stator of an induction motor is incorporated into an input filter circuit intended to assist in smoothing unwanted ripple waveforms prior to the rectification process.
  • the induction motor is represented by the equivalent circuit 10 enclosed within the dashed outline 20.
  • a variable capacitor 30 is provided, either in series with the circuit 10 or in shunt therewith (depending upon the construction of the induction motor and the relative dimensions of its equivalent circuit components, and depending upon the specific effects to be achieved thereby), to create a tuned filter with the inductive reactance of the equivalent circuit 10.
  • the tuned filter is intended to increase the efficiency of a rectifier circuit 40, in this example a bridge rectifier, by removing, or at least reducing unwanted ripple from the input alternating current waveform. Such unwanted ripple can be associated, for example, with harmonics of the power waveform frequency.
  • the inductive reactance incorporated into the filter circuit will, in general, comprise the entire lumped inductive reactance exhibited by the induction motor as a whole, it is preferred (though not essential) that the co-operative capacitative reactance of the capacitor 30, against which the inductive reactance is tuned, is variable, so as to permit trimming of the filter to allow for changes in the inductive reactance attributable to differing operational conditions.
  • a second motor 50 which comprises the main driving motor of a domestic appliance, and which is so located physically in relation to the induction motor as to be cooled by a fan (not shown) carried on the shaft of the induction motor.
  • the motor 50 may be disposed within a housing that is suitably vented and formed with ducting or other passageways to efficiently conduct the cooling air from the fan towards, and heated air away from, the motor 50.
  • the rectifier 40 may power, instead of or in addition to a motor such as 50, any kind of electrical circuitry 60 that incorporates components, such as power transistors, that would benefit from cooling, or which might otherwise be usefully associated with the provision of the induction motor.
  • the power transistors are associated with thermal control circuits in a toaster.
  • the induction motor itself is used as the prime motor driver of an electrical domestic appliance such as a blender, and the electrical circuitry 60 comprises speed and pulse control circuitry for the blender.
  • the electrical circuitry 60 comprises speed and pulse control circuitry for the blender.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

L'invention concerne un agencement de circuit comprenant un moteur à induction (10) pouvant être entraîné par une source d'alimentation en courant alternatif, un redresseur (40) conçu pour redresser le courant alternatif de façon à générer un courant continu afin d'entraîner au moins un dispositif ou un composant électrique associé au moteur, et un filtre destiné à réduire une ondulation indésirable; le filtre comprenant une réactance inductive attribuable au moteur à induction. Cet agencement favorise l'économie de composants et permet une réduction ou une suppression efficace d'une ondulation non désirée et d'autres formes d'ondes résultant du processus de redressement. De préférence, un condensateur (30) est monté en série avec la réactance inductive ou en parallèle avec celle-ci, de façon à créer un filtre syntonisé avec la réactance inductive. En outre, la réactance inductive comprend de préférence l'ensemble de la réactance inductive localisée présentée par le moteur à induction et la réactance du condensateur est variable de façon à rendre possible un réglage du filtre afin de permettre des modifications de la réactance inductive attribuables à différentes conditions de fonctionnement. L'invention concerne également un appareil électrique ménager incorporant un agencement de circuit selon l'un quelconque des précédents types.
PCT/GB2005/003049 2004-08-19 2005-08-03 Reduction d'ondulations a l'aide d'un filtre comprenant un condensateur et une reactance inductive d'un moteur a induction Ceased WO2006018599A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0418453A GB2417372A (en) 2004-08-19 2004-08-19 AC induction motor supply circuit having additional DC output
GB0418453.7 2004-08-19

Publications (1)

Publication Number Publication Date
WO2006018599A1 true WO2006018599A1 (fr) 2006-02-23

Family

ID=33042272

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/003049 Ceased WO2006018599A1 (fr) 2004-08-19 2005-08-03 Reduction d'ondulations a l'aide d'un filtre comprenant un condensateur et une reactance inductive d'un moteur a induction

Country Status (2)

Country Link
GB (1) GB2417372A (fr)
WO (1) WO2006018599A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007017392A1 (fr) * 2005-08-08 2007-02-15 Siemens Aktiengesellschaft Circuit electrique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245148A (en) * 1979-09-14 1981-01-13 Wisco Industries, Inc. Optically sensitive control circuit for a food browning device
GB2167288A (en) * 1984-11-23 1986-05-29 Teneret Ltd Heating appliance
EP0458057A1 (fr) * 1990-04-16 1991-11-27 Hitachi, Ltd. Méthode d'opération d'un aspirateur de poussières
US5905642A (en) * 1997-11-11 1999-05-18 Robicon Corporation Apparatus and method to reduce common mode voltage from current source drives
US6351872B1 (en) * 1999-07-16 2002-03-05 Matsushita Electric Corporation Of America Agitator motor projection system for vacuum cleaner

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3214673A (en) * 1960-05-04 1965-10-26 Philips Corp Production and stabilization of low direct voltage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245148A (en) * 1979-09-14 1981-01-13 Wisco Industries, Inc. Optically sensitive control circuit for a food browning device
GB2167288A (en) * 1984-11-23 1986-05-29 Teneret Ltd Heating appliance
EP0458057A1 (fr) * 1990-04-16 1991-11-27 Hitachi, Ltd. Méthode d'opération d'un aspirateur de poussières
US5905642A (en) * 1997-11-11 1999-05-18 Robicon Corporation Apparatus and method to reduce common mode voltage from current source drives
US6351872B1 (en) * 1999-07-16 2002-03-05 Matsushita Electric Corporation Of America Agitator motor projection system for vacuum cleaner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007017392A1 (fr) * 2005-08-08 2007-02-15 Siemens Aktiengesellschaft Circuit electrique

Also Published As

Publication number Publication date
GB2417372A (en) 2006-02-22
GB0418453D0 (en) 2004-09-22

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