GB815480A - Improvements in or relating to control systems for alternating current electric motors - Google Patents
Improvements in or relating to control systems for alternating current electric motorsInfo
- Publication number
- GB815480A GB815480A GB2853155A GB2853155A GB815480A GB 815480 A GB815480 A GB 815480A GB 2853155 A GB2853155 A GB 2853155A GB 2853155 A GB2853155 A GB 2853155A GB 815480 A GB815480 A GB 815480A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- feedback
- control systems
- speed
- oct
- 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
- 230000001419 dependent Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/02—Control systems without regulation, i.e. without retroactive action
- B66B1/06—Control systems without regulation, i.e. without retroactive action electric
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
815,480. Automatic speed-control systems. GENERAL ELECTRIC CO. Ltd. Oct. 8, 1956 [Oct. 6, 1955], No. 28531/55. Class 38 (4). In a system wherein the speed of an A.C. motor 1 is controlled automatically by an adjustable liquid resistance 4 in the rotor circuit and in accordance with the difference between an adjustable reference voltage applied at terminals 9 and the output of a tachometer generator 7, 8, through a magnetic amplifier 11, a feedback or compensating signal dependent on the motor torque is obtained from a current transformer 21 and a rectifier 22 and applied through a delay network 24 to an auxiliary winding 20 on the magnetic amplifier to reduce variation of speed due to variation in load. The system provides for dynamic braking during overspeed periods by the application of a direct current from source 23 to the stator windings, through contacts 19 which are caused to be actuated by a polarized relay 14 in the event of overspeeding. During dynamic braking the output from the current transformer is shortcircuited by contacts 25 and the feedback voltage is taken from a series resistor in the stator circuit. The tachometer field 8 is arranged to be reversed when the motor 1 is reversed, and alternative arrangements for deriving the feedback proportional to torque are referred to. Specifications 717,253 and 738,310 are referred to.
Publications (1)
Publication Number | Publication Date |
---|---|
GB815480A true GB815480A (en) | 1959-06-24 |
Family
ID=1741133
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2853155A Expired GB815480A (en) | 1955-10-06 | Improvements in or relating to control systems for alternating current electric motors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB815480A (en) |
-
1955
- 1955-10-06 GB GB2853155A patent/GB815480A/en not_active Expired
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