GB669850A - Improvements in electric motor control devices - Google Patents
Improvements in electric motor control devicesInfo
- Publication number
- GB669850A GB669850A GB9783/49A GB978349A GB669850A GB 669850 A GB669850 A GB 669850A GB 9783/49 A GB9783/49 A GB 9783/49A GB 978349 A GB978349 A GB 978349A GB 669850 A GB669850 A GB 669850A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- rectifier
- motor
- another modification
- 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
- 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 Direct Current Motors (AREA)
- Motor And Converter Starters (AREA)
Abstract
669,850. Control of D.C. motors. HEWITTIC SOC. A.R.L. April 11, 1949. [April 9, 1948; Feb. 17, 1949] Nos. 9783/49 and 9784/49. Class 38 (iii). [Also in Group XXXV] The speed of a D.C. motor is controlled by applying to the grid of the rectifier supplying the motor armature, a saw tooth voltage, the phasing of which is controlled by a voltage dependent on motor speed. The armature voltage of the separately excited motor 7, Fig. 1, is opposed by an auxiliary D.C. reference voltage, the resultant appearing across potentiometer 32. A portion of this voltage is added to a saw tooth voltage (generated by condenser 23 charging through rectifier 22 and discharging through resistor 24) to control the firing point on the saw tooth of an auxiliary gas filled valve 10 which in turn controls the main rectifier 1. A transformer 50 connected across a series resistor 8 produces a current limiting voltage across resistor 53, if the peak voltage across the transformer secondary exceeds a limiting voltage from a bias source 51. The voltage between the point L and the cathode of the rectifier 1 is limited by a load limiter comprising a biasing source 41 and a rectifier 42. In a modification. Fig. 2 (not shown) only a portion of the motor armature voltage tapped off a further potentiometer is used for control purposes. In another modification, Fig. 4, the field is supplied, through reversing switches 72A, 72B and contactors 70, 71, from a transformer winding 63 and auxiliary electrode 60; 61 in the main rectifier. A rectifier 34 supplies the reference voltage to the forward and reverse speed controlling potentiometers 32<SP>1</SP> and 32<SP>2</SP>, the output of the appropriate potentiometer being selected by a switch 72c and applied to the control circuit at point L as in Fig. 1. The full reference voltage may be applied to the control circuit in positions r and s of switch 72c in order to brake the motor. In another modification, Fig. 5 (not shown) an A.C. reference voltage is compared in a ring modulator with the output of an A.C. generator, the resultant being used as the control voltage at point L of,Fig. 1. The A.C. sources may be generated: by rotating interruptors and photo-cells. In another modification, Fig. 6 (not shown), the D.C. reference voltage of Fig. 1 is regularly interrupted by a timing relay. This enables a momentary peak to be obtained for motor starting. In another modification Fig. 8 (not shown) a field winding opposing the separately excited main field is connected across the motor armature. In another modification, Fig. 10, the field 9 is excited from an A.C. source via a rectifier 106 and an, impedance 107 which is, itself connected via a rectifier 108 across the motor armature. When the armature voltage exceeds the normal voltage . drop across resistor 107, rectifier 108 conducts and the resulting circulating current. reduces the field excitation. In another modification, Fig. 11 (not shown) the D.C. reference voltage is obtained by rectifying the output of a saturated current transformer,. the primary of which is in series with the A.C. supply to the. rectifier which supplies the motor field. Specification 657,031, [Group XXXV], is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR669850X | 1948-04-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB669850A true GB669850A (en) | 1952-04-09 |
Family
ID=9015950
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9783/49A Expired GB669850A (en) | 1948-04-09 | 1949-04-11 | Improvements in electric motor control devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB669850A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2715708A (en) * | 1954-06-04 | 1955-08-16 | Oscar E Carlson | Electronic motor speed control |
US2977523A (en) * | 1958-12-31 | 1961-03-28 | Gen Electric | Control circuit |
-
1949
- 1949-04-11 GB GB9783/49A patent/GB669850A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2715708A (en) * | 1954-06-04 | 1955-08-16 | Oscar E Carlson | Electronic motor speed control |
US2977523A (en) * | 1958-12-31 | 1961-03-28 | Gen Electric | Control circuit |
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