CA2327579A1 - Method and apparatus of improving the efficiency of an induction motor - Google Patents

Method and apparatus of improving the efficiency of an induction motor Download PDF

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Publication number
CA2327579A1
CA2327579A1 CA 2327579 CA2327579A CA2327579A1 CA 2327579 A1 CA2327579 A1 CA 2327579A1 CA 2327579 CA2327579 CA 2327579 CA 2327579 A CA2327579 A CA 2327579A CA 2327579 A1 CA2327579 A1 CA 2327579A1
Authority
CA
Canada
Prior art keywords
voltage
torque producing
efficiency
estimated
phase voltage
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.)
Granted
Application number
CA 2327579
Other languages
French (fr)
Other versions
CA2327579C (en
Inventor
Brian T. Branecky
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.)
AO Smith Corp
Original Assignee
AO Smith 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 AO Smith Corp filed Critical AO Smith Corp
Publication of CA2327579A1 publication Critical patent/CA2327579A1/en
Application granted granted Critical
Publication of CA2327579C publication Critical patent/CA2327579C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/08—Controlling based on slip frequency, e.g. adding slip frequency and speed proportional frequency

Abstract

An apparatus and method of maximizing the efficiency of an induction motor is claimed. Three phase AC power is supplied to energize the motor. A DC voltage and a DC current are measured and used to determine an estimated phase voltage. An actual torque producing current is determined based on the DC voltage, DC current and the estimated phase voltage. An estimating torque producing current value is determined and compared with the actual torque producing current value. An error term representing the difference between the actual and estimated torque producing current values is determined.
The estimated phase voltage value is changed based on the error term. The three phase AC power supplied to the motor is adjusted based on the estimated phase voltage.
CA 2327579 1999-12-13 2000-12-05 Method and apparatus of improving the efficiency of an induction motor Expired - Fee Related CA2327579C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US17033899P 1999-12-13 1999-12-13
US60/170,338 1999-12-13
US09/713,343 2000-11-14

Publications (2)

Publication Number Publication Date
CA2327579A1 true CA2327579A1 (en) 2001-06-13
CA2327579C CA2327579C (en) 2008-07-29

Family

ID=22619495

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2327579 Expired - Fee Related CA2327579C (en) 1999-12-13 2000-12-05 Method and apparatus of improving the efficiency of an induction motor

Country Status (2)

Country Link
CA (1) CA2327579C (en)
FR (1) FR2806552B1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482852A (en) * 1981-06-24 1984-11-13 Westinghouse Electric Corp. Motor slip controller for AC motors
US4677360A (en) * 1986-03-13 1987-06-30 General Electric Company Field weakening induction drive
EP0243960B1 (en) * 1986-05-02 1991-11-13 Nec Corporation Vector control apparatus for induction motor
JP2780263B2 (en) * 1988-02-23 1998-07-30 株式会社明電舎 Vector control method and device for induction motor
JP2718001B2 (en) * 1993-03-08 1998-02-25 アレックス電子工業株式会社 Power control device for induction motor
US5796237A (en) * 1995-03-13 1998-08-18 Tajima Engineering Kabushiki Kaishya Efficiency control system for an induction motor

Also Published As

Publication number Publication date
CA2327579C (en) 2008-07-29
FR2806552A1 (en) 2001-09-21
FR2806552B1 (en) 2004-10-01

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