GB1167320A - An Arrangement for Controlling the Speed of an Electric Induction Motor. - Google Patents

An Arrangement for Controlling the Speed of an Electric Induction Motor.

Info

Publication number
GB1167320A
GB1167320A GB5835566A GB5835566A GB1167320A GB 1167320 A GB1167320 A GB 1167320A GB 5835566 A GB5835566 A GB 5835566A GB 5835566 A GB5835566 A GB 5835566A GB 1167320 A GB1167320 A GB 1167320A
Authority
GB
United Kingdom
Prior art keywords
oscillator
stator
controlled
motor
gto2
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
Application number
GB5835566A
Inventor
Geoffrey Duddridge
John Edward Crowe
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB5835566A priority Critical patent/GB1167320A/en
Publication of GB1167320A publication Critical patent/GB1167320A/en
Expired legal-status Critical Current

Links

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
    • H02P27/08—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 with pulse width modulation

Landscapes

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

Abstract

1,167,320. Control of A.C. motors; inverting. STANDARD TELEPHONES & CABLES Ltd. 30 Dec., 1966, No. 58355/66. Headings H2F and H2J. [Also in Division H3] The speed of an induction motor is controlled by energizing its stator via two gate turn-off devices GTO1, GTO2 controlled by a generator of square waves whose pulse width is modulated sinusoidally by a frequency-controlled oscillator so that the net stator flux A also varies sinusoidally. As shown, the motor has bifilar stator windings X, Y which are energized alternately but a standard motor may be used, its stator being connected to the secondary of a transformer whose primary has the windings X and Y. The pulse generator comprises a free-running multivibrator circuit (Fig. 3, not shown) and the oscillator is a Wein bridge oscillator (Fig. 2, not shown) whose output is amplified by bi-stable switching circuits (Fig. 4, not shown). The switching devices GTO1, GTO2 are protected by ensuring good coupling between X and Y, so that stored energy is transferred at change over, diodes D5, D6 completing the circuit. If triggering pulses are short R25, D3 and R26, D4 provide "hold-on" current. For polyphase motors a single oscillator would modulate the required number of channels. The supply may be either smooth D.C. or unsmoothed full-wave rectified A.C.
GB5835566A 1966-12-30 1966-12-30 An Arrangement for Controlling the Speed of an Electric Induction Motor. Expired GB1167320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5835566A GB1167320A (en) 1966-12-30 1966-12-30 An Arrangement for Controlling the Speed of an Electric Induction Motor.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5835566A GB1167320A (en) 1966-12-30 1966-12-30 An Arrangement for Controlling the Speed of an Electric Induction Motor.

Publications (1)

Publication Number Publication Date
GB1167320A true GB1167320A (en) 1969-10-15

Family

ID=10481402

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5835566A Expired GB1167320A (en) 1966-12-30 1966-12-30 An Arrangement for Controlling the Speed of an Electric Induction Motor.

Country Status (1)

Country Link
GB (1) GB1167320A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2150772A (en) * 1983-12-01 1985-07-03 Barry Wayne Williams Motor drive circuits
DE3534570A1 (en) * 1984-10-05 1986-04-10 Schrack Elektronik Ag DC / AC CONVERTER
GB2272339A (en) * 1992-11-10 1994-05-11 Philips Electronics Nv Circuit arrangement for driving an inductive load

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2150772A (en) * 1983-12-01 1985-07-03 Barry Wayne Williams Motor drive circuits
DE3534570A1 (en) * 1984-10-05 1986-04-10 Schrack Elektronik Ag DC / AC CONVERTER
GB2272339A (en) * 1992-11-10 1994-05-11 Philips Electronics Nv Circuit arrangement for driving an inductive load
US5514942A (en) * 1992-11-10 1996-05-07 U.S. Philips Corporation Circuit arrangement for powering control circuitry and driving an inductive load from a single DC source
GB2272339B (en) * 1992-11-10 1996-10-23 Philips Electronics Nv Circuit arrangement for driving an inductive load

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees