GB933862A - Improvements in or relating to electric motor control arrangements for use in the transportation of web - Google Patents
Improvements in or relating to electric motor control arrangements for use in the transportation of webInfo
- Publication number
- GB933862A GB933862A GB3849858A GB3849858A GB933862A GB 933862 A GB933862 A GB 933862A GB 3849858 A GB3849858 A GB 3849858A GB 3849858 A GB3849858 A GB 3849858A GB 933862 A GB933862 A GB 933862A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tape
- motor
- switch
- power
- full
- 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
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
- H02P5/50—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another by comparing electrical values representing the speeds
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
933,862. Control of several A.C. motors. ELECTRIC & MUSICAL INDUSTRIES Ltd. Nov. 30, 1959 [Nov. 28, 1958], No. 38498/58. Class 38 (3). When a switch SWA is closed, full power is applied to a take-up motor 10 for reeling magnetic tape, reduced power being supplied to the running winding 13 of capstan motor 12 through resistors R1, R2, in parallel. Full mains power is also applied to starting winding 14, the motor 11 coupled to the supply spool being de-energized. At a predetermined speed of the capstan roller, centrifugal switch 15 opens so that full power is now applied to the running winding 13 and the starting winding is disconnected. The take-up motor 10 receives reduced power through resistor R1, whilst the motor 11 is excited with D.C. braking current through resistor R3 to provide a back-tension. The tape thus reaches full speed and continues so to travel until the end of the tape is approached, whereupon a signal from photo-sensitive device P1 or P2 causes the starting winding 14 to receive full power in the reverse direction, the running winding 13 receiving reduced power. The capstan motor slows down, and simultaneously the motor driving the new take-up spool receives full power. The tape is accelerated until the centrifugal switch 15 opens whereupon the power supplies are changed to bring the tape to full speed. During the change-over it is necessary for relay RLF4 to be energized even though the centrifugal switch 15 is open and this is achieved by means of mercury switch 16 responsive to the direction of rotation of the capstan motor. Movement of the tape is stopped by opening switch SWA to de-energize the capstan motor, apply a small alternating-current to the take-up motor, and a direct braking current to the supply motor. After a predetermined period, both motors are de-energized. In the system described the tape is brought to rest due to the provision of transparent portions at the ends thereof, a switch SWB being operated when a spool is half full. With such an arrangement the length of transparent portions of the tape may be reduced. The photo-sensitive devices may be replaced by recorded signals at the ends of the tape. A switch 23 is coupled to switch 16 to ensure response to the signal from the photo-cell which occurs nearest to the end of the tape which is being approached and not to a signal which is received during acceleration of the tape. If the tape stops in the middle of its length due to power failure, the switch SWB ensures that, upon re-starting, the take-up spool is the one with the least amount of tape.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3849858A GB933862A (en) | 1958-11-28 | 1958-11-28 | Improvements in or relating to electric motor control arrangements for use in the transportation of web |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3849858A GB933862A (en) | 1958-11-28 | 1958-11-28 | Improvements in or relating to electric motor control arrangements for use in the transportation of web |
Publications (1)
Publication Number | Publication Date |
---|---|
GB933862A true GB933862A (en) | 1963-08-14 |
Family
ID=10403858
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3849858A Expired GB933862A (en) | 1958-11-28 | 1958-11-28 | Improvements in or relating to electric motor control arrangements for use in the transportation of web |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB933862A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3444445A (en) * | 1962-01-15 | 1969-05-13 | Minnesota Mining & Mfg | Plural motor torque control for tape transport mechanism |
-
1958
- 1958-11-28 GB GB3849858A patent/GB933862A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3444445A (en) * | 1962-01-15 | 1969-05-13 | Minnesota Mining & Mfg | Plural motor torque control for tape transport mechanism |
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