GB590060A - Improvements in and relating to electric control systems employing limit switches for electric and other motors - Google Patents
Improvements in and relating to electric control systems employing limit switches for electric and other motorsInfo
- Publication number
- GB590060A GB590060A GB1871343A GB1871343A GB590060A GB 590060 A GB590060 A GB 590060A GB 1871343 A GB1871343 A GB 1871343A GB 1871343 A GB1871343 A GB 1871343A GB 590060 A GB590060 A GB 590060A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- torque
- rectifier
- limit
- winding
- 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
- 238000004804 winding Methods 0.000 abstract 6
- 230000001419 dependent Effects 0.000 abstract 2
- 230000002441 reversible Effects 0.000 abstract 2
- 230000001133 acceleration Effects 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000000875 corresponding Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000006011 modification reaction Methods 0.000 abstract 1
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
- H02P7/20—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 multi-position switch, e.g. drum, controlling motor circuit by means of relays
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Servomotors (AREA)
Abstract
590,060. Fluid-pressure servomotorcontrol systems. SIMMONS, J. D., and METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Nov. 10, 1943, No. 18713. Drawings to Specification. [Class 135] [Also in Group XXXVII] In a system for controlling a hydraulic motor in which the operation of a limit switch gives rise to a torque dependent on the speed of the motor and in opposition to the movement of the motor, a rectifier is arranged so that when the motor is reversed the opposition torque is eliminated or reduced. In the arrangement described a reversible hydraulic motor is controlled by a throttle valve operated by a moving coil electromagnetic device, the moving element of which has a main and an auxiliary winding. In normal operation, the direction and amount of opening of the valve is dependent on the direction and magnitude of the current supplied to the main winding through any suitable control means from a source of constant voltage. At each limit of motor travel, the auxiliary winding is energized through a limit switch and rectifier from a tachometer generator coupled to the motor so as to oppose the main winding and thereby reduce motor torque. Thus, the motor may be held against limit stops by a torque of low value. On reversal of the motor, the rectifier is no longer conductive and the motor moves away from the stop with full acceleration. Two pairs of limit. switches may be used so that only one rectifier is necessary. In a modification, the throttle valve may be manually operated and a byepass valve, which is spring-biassed to its closed position, opened electromagnetically, to reduce motor torque at the limits of motor travel, by a winding corresponding to the auxiliary winding above.
Publications (1)
Publication Number | Publication Date |
---|---|
GB590060A true GB590060A (en) | 1947-07-08 |
Family
ID=1734128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1871343A Expired GB590060A (en) | 1943-11-10 | Improvements in and relating to electric control systems employing limit switches for electric and other motors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB590060A (en) |
-
1943
- 1943-11-10 GB GB1871343A patent/GB590060A/en not_active Expired
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