GB1127065A - Improvements in and relating to electronic switching means - Google Patents

Improvements in and relating to electronic switching means

Info

Publication number
GB1127065A
GB1127065A GB2408364A GB2408364A GB1127065A GB 1127065 A GB1127065 A GB 1127065A GB 2408364 A GB2408364 A GB 2408364A GB 2408364 A GB2408364 A GB 2408364A GB 1127065 A GB1127065 A GB 1127065A
Authority
GB
United Kingdom
Prior art keywords
rotor
control
magnet
oscillating
current
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
GB2408364A
Inventor
George Ernest Burton
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB2408364A priority Critical patent/GB1127065A/en
Publication of GB1127065A publication Critical patent/GB1127065A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
    • H03K3/30—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using a transformer for feedback, e.g. blocking oscillator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/12—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using detecting coils using the machine windings as detecting coil

Abstract

1,127,065. Automatic control of speed. NATIONAL RESEARCH DEVELOPMENT CORP. Sept. 10, 1965 [June 10, 19641, No.24083/64. Heading G3R. [Also in Division H2 and H3] A load, such as a motor winding 11, is switched across a D. C. source by an oscillator comprising a saturable indicator T and arranged to pass a small average current when oscillating but to pass a larger current through the load when oscillation is inhibited by proximity of a magnet RM causing saturation of the indicator. Fig. 4 shows a motor having a permanent magnet rotor RM and four stator coils 11... 14 the direction of current in which is controlled by eight oscillating switches A +, C - (only two shown) selectively rendered conductive or non-conductive by the field of the rotor RM. Each oscillating switch comprises a transistor VT having positive feedback via a Mumeta 1 (Trade Mark) or ferrite corded transformer T and a timing circuit CR so as to form a blocking oscillator having a mark/ space ratio of 3:1000. The average current is thus so small that the circuit is considered as equivalent to a switch in its "off" condition between the supply and windings 11... 14. When, however, one of the poles of the rotor magnet RM approaches one of the toroidal transformers T, the core is saturated so that oscillation ceases and the transistor becomes continuously conductive so as to form the "on" condition of the switch. Biasing magnets PM are provided so that the switches are only turned on by an appropriate pole of the rotor magnet. The direction of rotation is reversible by reversing the polarity of the biasing magnets. Alternatively, the N and S poles of the rotor magnet may be disposed in different planes so that biasing magnets are not required. All transformers T may be bodily adjustable angularly around the rotor corresponding to a conventional brush rocker. The transistor oscillators may control switching thyristors or thyratrons. The invention is also applicable to linear motors Speed control. Direct current from a tachogenerator may be injected into biasing windings on transformer T to control the speed. Alternatively the frequency of commutation may be compared with an adjustable reference frequency to provide a control voltage in accordance with frequency difference.
GB2408364A 1964-06-10 1964-06-10 Improvements in and relating to electronic switching means Expired GB1127065A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2408364A GB1127065A (en) 1964-06-10 1964-06-10 Improvements in and relating to electronic switching means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2408364A GB1127065A (en) 1964-06-10 1964-06-10 Improvements in and relating to electronic switching means

Publications (1)

Publication Number Publication Date
GB1127065A true GB1127065A (en) 1968-09-11

Family

ID=10206093

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2408364A Expired GB1127065A (en) 1964-06-10 1964-06-10 Improvements in and relating to electronic switching means

Country Status (1)

Country Link
GB (1) GB1127065A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2316778A1 (en) * 1975-06-18 1977-01-28 Danfoss As CONTINUOUS CURRENT MOTOR WITHOUT COLLECTOR
FR2316780A1 (en) * 1975-06-18 1977-01-28 Danfoss As Brushless DC motor control circuit with automatic starting - has permanent magnet rotor whose position is detected
EP0018904A1 (en) * 1979-04-26 1980-11-12 Crouzet Commutatorless D.C. motor
FR2596218A1 (en) * 1986-03-24 1987-09-25 Elf Aquitaine Brushless DC motor and use of the motor with an electronic commutation circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2316778A1 (en) * 1975-06-18 1977-01-28 Danfoss As CONTINUOUS CURRENT MOTOR WITHOUT COLLECTOR
FR2316780A1 (en) * 1975-06-18 1977-01-28 Danfoss As Brushless DC motor control circuit with automatic starting - has permanent magnet rotor whose position is detected
EP0018904A1 (en) * 1979-04-26 1980-11-12 Crouzet Commutatorless D.C. motor
FR2596218A1 (en) * 1986-03-24 1987-09-25 Elf Aquitaine Brushless DC motor and use of the motor with an electronic commutation circuit

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