GB1459835A – Electric motor control apparatus
– Google Patents
GB1459835A – Electric motor control apparatus
– Google Patents
Electric motor control apparatus
Info
Publication number
GB1459835A
GB1459835A
GB1767274A
GB1767274A
GB1459835A
GB 1459835 A
GB1459835 A
GB 1459835A
GB 1767274 A
GB1767274 A
GB 1767274A
GB 1767274 A
GB1767274 A
GB 1767274A
GB 1459835 A
GB1459835 A
GB 1459835A
Authority
GB
United Kingdom
Prior art keywords
motor
control
frequency
circuit
resistor
Prior art date
1973-04-25
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
GB1767274A
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.)
Individual
Original Assignee
Individual
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.)
1973-04-25
Filing date
1974-04-23
Publication date
1976-12-31
1974-04-23
Application filed by Individual
filed
Critical
Individual
1976-12-31
Publication of GB1459835A
publication
Critical
patent/GB1459835A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
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
H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
H02P1/18—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual dc motor
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
H02P27/02—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using supply voltage with constant frequency and variable amplitude
Abstract
1459835 Control of A.C. motors; inverting H BERMAN 23 April 1974 [25 April 1973] 17672/74 Headings H2J and H2F A speed control system for an A.C. motor having at least one stator winding comprises a variable frequency clock circuit controlling circuit means which supplies the winding(s) with an A.C. voltage of frequency determined by the clock circuit, a power supply providing D.C. to the circuit means, and feedback means sensing the D.C. power drawn by the circuit means and controlling the clock circuit frequency to be inversely porportional to the magnitude of the D.C. power drawn by the circuit means. The system ensures smooth starting of the motor when its speed adjusting control is initially set at an intermediate or high value in conditions when the motor would otherwise fail to start. The system may control a squirrel-cage induction motor or a permanent magnet hysteresis motor, the former application being shown in Fig. 2 wherein the windings 81, 82 of an induction motor 100 are supplied with rectangular pulses of current in time quadrature by transistor bridge circuits 80, 90 controlled by corresponding pulse signals, Fig. 3 (not shown), produced at the outputs A, A; B, B of a signal generator 70 including bi-stable circuits 72, 74 responsive to the output of a clock circuit 40 through a logic buffer 50 and to the output of a logic power switch 60 through line 61. The frequency of the output signal from buffer 50 is determined by the value of capacitor 43 and the total resistance of a circuit including a potentiometer 39 and photo-resistors 24, 34 respectively responsive to the light emitting diode 22 of a speed setting control 20 and to the light emitting diode 32 of feedback means 30 connected, through transistors 35, 36, to a resistor 132 in the supply line 31 from a full wave rectified supply 10, 12, 15 to the bridges 80, 90. If the motor 100 fails to start when the clock frequency is set to an intermediate or high value by adjustment of a shutter 21 of the control 20, a large current flows through resistor 132 causing transistor 36 to shunt current from LED 32, thus increasing the resistance of resistor 34 to decrease the frequency of clock circuit 40 and enable the motor to start. As it speeds up, the current through resistor 132 decreases and the clock frequency is correspondingly increased up to the value set by the control 20. In order to provide gradual slowing and automatic braking of the motor when the control 20 is set to zero, the resistor 24 is chosen to have a long time constant over the portion of its resistance/time characteristic following the «light off» condition, Fig. 4 (not shown), whereby the clock frequency is gradually decreased asis the output signal from switch 60 after blocking of a Zener diode 64, this signal decrease and the different inherent characteristics of the circuits 72, 74 ensuring that one of them stops operating before the other, thus producing a period during which only one motor winding is energized and the motor is consequently braked. A similar effect may be produced by using a potentiometer instead of members 22, 24 in control 20 and providing a voltage decay circuit of long time constant.
GB1767274A
1973-04-25
1974-04-23
Electric motor control apparatus
Expired
GB1459835A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US00354355A
US3849709A
(en)
1973-04-25
1973-04-25
Motor control system
Publications (1)
Publication Number
Publication Date
GB1459835A
true
GB1459835A
(en)
1976-12-31
Family
ID=23392955
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1767274A
Expired
GB1459835A
(en)
1973-04-25
1974-04-23
Electric motor control apparatus
Country Status (5)
Country
Link
US
(1)
US3849709A
(en)
JP
(1)
JPS5027020A
(en)
DE
(1)
DE2420073A1
(en)
FR
(1)
FR2227679B1
(en)
GB
(1)
GB1459835A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2122434A
(en)
*
1982-05-28
1984-01-11
Michael John Flowerday
Electric motor control
Families Citing this family (10)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4006391A
(en)
*
1974-12-20
1977-02-01
E-Systems, Inc.
Linearized pulse width modulator
US4008425A
(en)
*
1975-01-09
1977-02-15
Ampex Corporation
Motor servo system with multiplier means to drive and servo the motor
US4320331A
(en)
*
1979-10-01
1982-03-16
General Electric Company
Transistorized current controlled pulse width modulated inverter machine drive system
US4550277A
(en)
*
1984-09-24
1985-10-29
Black & Decker Inc.
Overload detection and warning system for electric motors in power tools and the like
US4989664A
(en)
*
1988-07-07
1991-02-05
United Technologies Corporation
Core molding composition
US5070292A
(en)
*
1989-11-13
1991-12-03
Performance Controls, Inc.
Pulse-width modulated circuit for driving a load
US5081409A
(en)
*
1989-11-13
1992-01-14
Performance Controls, Inc.
Pulse-width modulated circuit for driving a load
JP2814868B2
(en)
*
1992-06-17
1998-10-27
三菱電機株式会社
Plate type heat exchanger and method of manufacturing the same
US6353354B1
(en)
1999-09-28
2002-03-05
Mts Systems Corporation
Pulse-width modulated bridge circuit within a second bridge circuit
RU2587545C1
(en)
*
2015-01-30
2016-06-20
Федеральное государственное автономное образовательное учреждение высшего образования «Национальный исследовательский Томский политехнический университет»
Control device of two-phase asynchronous motor in oscillating flow mode
Family Cites Families (9)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3374410A
(en)
*
1965-01-06
1968-03-19
Ibm
Stepping motor positioning system including acceleration and deceleration control
US3512067A
(en)
*
1965-03-25
1970-05-12
Mini Ind Constructillor
Speed regulation of asynchronous three-phase motors
US3416057A
(en)
*
1966-04-06
1968-12-10
Gaylord Rives Company
A.c. motor speed control system using selected voltage levels inverted at selected frequencies and method
US3514685A
(en)
*
1967-04-24
1970-05-26
Fan Tron Corp
Optical speed transducer
US3518516A
(en)
*
1967-12-26
1970-06-30
Ibm
Stepping motor constant velocity drive
DK130099B
(en)
*
1968-03-16
1974-12-16
Danfoss As
Control circuit for an AC motor.
AT289964B
(en)
*
1968-04-18
1971-05-10
Siemens Ag
Electrical device for the formation of actual values in a meshed control arrangement for an in particular converter-fed three-phase asynchronous machine
US3718847A
(en)
*
1971-05-28
1973-02-27
Gen Electric
Adjustable speed polyphase a-c motor drive utilizing an in-phase current signal for motor control
US3719873A
(en)
*
1971-06-15
1973-03-06
Gen Electric
Current limiting control for an electric power system
1973
1973-04-25
US
US00354355A
patent/US3849709A/en
not_active
Expired – Lifetime
1974
1974-04-23
GB
GB1767274A
patent/GB1459835A/en
not_active
Expired
1974-04-25
DE
DE2420073A
patent/DE2420073A1/en
not_active
Withdrawn
1974-04-25
JP
JP49047086A
patent/JPS5027020A/ja
active
Pending
1974-04-25
FR
FR7414464A
patent/FR2227679B1/fr
not_active
Expired
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2122434A
(en)
*
1982-05-28
1984-01-11
Michael John Flowerday
Electric motor control
Also Published As
Publication number
Publication date
DE2420073A1
(en)
1974-11-14
US3849709A
(en)
1974-11-19
FR2227679B1
(en)
1978-07-07
JPS5027020A
(en)
1975-03-20
FR2227679A1
(en)
1974-11-22
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Legal Events
Date
Code
Title
Description
1977-05-18
PS
Patent sealed [section 19, patents act 1949]
1984-12-27
PCNP
Patent ceased through non-payment of renewal fee
