GB1319111A - Electric motor speed control - Google Patents
Electric motor speed controlInfo
- Publication number
- GB1319111A GB1319111A GB5157270A GB1319111DA GB1319111A GB 1319111 A GB1319111 A GB 1319111A GB 5157270 A GB5157270 A GB 5157270A GB 1319111D A GB1319111D A GB 1319111DA GB 1319111 A GB1319111 A GB 1319111A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- potentiometer
- thyristors
- terminals
- control
- 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
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/292—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC
- H02P7/293—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC using phase control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Multiple Motors (AREA)
Abstract
1319111 Control of DC motors CHILES (PATENTS & SYSTEMS) Ltd 29 Oct 1971 [29 Oct 1970] 51572/70 Heading H2J A reversible motor may be driven at a variable speed in either direction of rotation by the control circuit shown, in which a unidirectional current corresponding to one or other direction is produced between AC supply terminals PT1, PT2 and motor terminals M1, M2 by firing of an appropriate one of thyristors SCR1, SCR2 whose current path is completed by a corresponding diode D3, D2. At the centre wiper position of a potentiometer R3, neither thyristor is fired and the motor is stationary. Variable resistors R4, R5 are adjustable to determine the instant in each half-cycle at which the thyristors conduct and thus provide adjustment of the "flat spot" in the centre of the potentiometer and compensation for differences between the thyristors and motors to be controlled. Automatic speed regulation at any particular setting of the wiper of potentiometer R3 is inherently provided by virtue of the fact that a variation in load on the motor varies its back EMF, which varies the trigger potential applied through members R1, R2, D1, R3 in a compensating manner, such that the firing point of the conducting thyristor is varied to restore the speed to its previous set value. The motor A is a universal motor having a field winding F supplied through a full wave rectifier bridge D4-D7. Alternatively the field winding F may be across the terminals M1, M2 and the armature A may be supplied through the rectifier bridge, Fig. 2 (not shown). Application of the circuit to control a seriesfield motor is also described. Fig. 3 (not shown). Alternatively the motor may have a permanent magnet or separately-excited field.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5157270 | 1970-10-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1319111A true GB1319111A (en) | 1973-06-06 |
Family
ID=10460535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5157270A Expired GB1319111A (en) | 1970-10-29 | 1970-10-29 | Electric motor speed control |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPS529805B1 (en) |
CA (1) | CA943626A (en) |
GB (1) | GB1319111A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2229590A (en) * | 1989-02-28 | 1990-09-26 | Square D Co | Bidirectional motor control system |
-
1970
- 1970-10-29 GB GB5157270A patent/GB1319111A/en not_active Expired
-
1971
- 1971-10-27 JP JP7185416A patent/JPS529805B1/ja active Pending
- 1971-10-28 CA CA126,322A patent/CA943626A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2229590A (en) * | 1989-02-28 | 1990-09-26 | Square D Co | Bidirectional motor control system |
GB2229590B (en) * | 1989-02-28 | 1993-09-01 | Square D Co | Control circuit for a bidirectional motor |
Also Published As
Publication number | Publication date |
---|---|
JPS529805B1 (en) | 1977-03-18 |
CA943626A (en) | 1974-03-12 |
AU3503871A (en) | 1973-05-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |