GB1447778A - Speed control circuit for a universal motor - Google Patents
Speed control circuit for a universal motorInfo
- Publication number
- GB1447778A GB1447778A GB4552473A GB4552473A GB1447778A GB 1447778 A GB1447778 A GB 1447778A GB 4552473 A GB4552473 A GB 4552473A GB 4552473 A GB4552473 A GB 4552473A GB 1447778 A GB1447778 A GB 1447778A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- motor
- control
- thyristor
- reference 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.)
- Expired
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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/10—Commutator motors, e.g. repulsion motors
- H02P25/14—Universal motors
- H02P25/145—Universal motors whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value, speed feedback
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
1447778 Automatic control of speed INTERNATIONAL STANDARD ELECTRIC CORP 28 Sept 1973 [5 Oct 1972] 45524/73 Heading G3R [Also in Division H2] The speed of a universal (series-wound) motor is controlled by providing a first transistor whose base is connected to a reference voltage source and whose emitter is energized by the motor back e.m.f. to control a second transistor in the firing circuit of a thyristor in the motor armature circuit. In the arrangement shown the base of transistor T 1 is connected to a potentiometer P to tap off a proportion of the reference voltage developed by resistance R4 and Zener diode D 1 connected in series with motor field windings F2, F1 across the supply. The collector of transistor T1 is connected to the firing circuit Z which includes a transistor T2 which acts as a variable impedance to control the charging rate of capacitor C1 used to fire thyristor Th through diac D3. The transistor T1 is thus controlled by the difference between the reference voltage and armature back e.m.f. to change the firing angle of the thyristor and thus control the motor speed to a level set by potentiometer P. The use of a full-wave bridge rectifier to supply the control and firing circuit is disclosed.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19722248914 DE2248914B2 (en) | 1972-10-05 | 1972-10-05 | CIRCUIT ARRANGEMENT FOR THE SPEED CONTROL OF A UNIVERSAL MOTOR |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1447778A true GB1447778A (en) | 1976-09-02 |
Family
ID=5858275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4552473A Expired GB1447778A (en) | 1972-10-05 | 1973-09-28 | Speed control circuit for a universal motor |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE2248914B2 (en) |
GB (1) | GB1447778A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2269280A (en) * | 1992-07-30 | 1994-02-02 | Yang Tai Her | Electric motor control |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS535717A (en) * | 1976-07-05 | 1978-01-19 | Yamamoto Electric Ind Co Ltd | Speed control device for electric motor |
DE2826629A1 (en) * | 1978-06-19 | 1980-01-03 | Marquardt J & J | Half-wave control circuit for universal motors - has thyristor regulated by voltage divider and has control circuit with trigger diode and ignition capacitor |
US4275343A (en) | 1978-12-28 | 1981-06-23 | The Charles Stark Draper Laboratory, Inc. | Back EMF controlled permanent magnet motor |
DE4021560A1 (en) * | 1990-07-06 | 1992-01-16 | Telefunken Electronic Gmbh | Electric power tool with tachogenerator - determining and regulating RPM with circuit determining armature voltage of motor proportional to RPM |
-
1972
- 1972-10-05 DE DE19722248914 patent/DE2248914B2/en not_active Withdrawn
-
1973
- 1973-09-28 GB GB4552473A patent/GB1447778A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2269280A (en) * | 1992-07-30 | 1994-02-02 | Yang Tai Her | Electric motor control |
Also Published As
Publication number | Publication date |
---|---|
DE2248914B2 (en) | 1978-01-05 |
DE2248914A1 (en) | 1974-04-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |