GB724661A - Improvements in or relating to arrangements for the operation of three-phase motors with an auxiliary frequency lower than the normal operating frequency - Google Patents
Improvements in or relating to arrangements for the operation of three-phase motors with an auxiliary frequency lower than the normal operating frequencyInfo
- Publication number
- GB724661A GB724661A GB1893/53A GB189353A GB724661A GB 724661 A GB724661 A GB 724661A GB 1893/53 A GB1893/53 A GB 1893/53A GB 189353 A GB189353 A GB 189353A GB 724661 A GB724661 A GB 724661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- speed
- tachometer
- phase
- output
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
- B66B1/28—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
724,661. Automatic speed-control systems. SIEMENS-SCHUCKERTWERKE AKT.-GES. Jan. 22, 1953 [Jan. 22, 1952], No. 1893/53. Class 38 (4). [Also in Group XXXVII] In a three-phase-hoist motor-control system of the kind using a low auxiliary frequency during, e.g., braking and stopping, the excitation of the motor at the auxiliary frequency is automatically controlled to maintain a predetermined speed. As shown, a three-phase wound rotor induction motor 1 may be supplied from a main supply at, e.g., 50 cycles through " forward " or " reverse " switches 2, 3, or it may be supplied from an auxiliary supply at, e.g., 2 c/s. through " forward " or " reverse " switches 4, 5, and a motor-operated resistor 6 for varying the excitation. The hoist-motor 1 drives a tachometer-generator 14 having a three-phase field rotating in the opposite direction to the rotor, whereby the rotor output voltage varies with the speed, and there is a high output at synchronous speed. The output of the tachometer 14 is rectified at 21 and applied to the resistance-operating servomotor 28, in opposition to a reference voltage, from rectifier 22, the magnitude of which is preset by a contact arm 23 co-operating with resistors 24, 25 and mechanically coupled to the hand-control lever (not shown). The direction of rotation of the servomotor is controlled by a relay 20 according to whether the motor is hoisting, or braking an overhauling load (i.e. according to the tachometer output indicating that the motor is below or above synchronous speed) so that resistor 6 is varied in the correct direction to maintain constant speed.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE724661X | 1952-01-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB724661A true GB724661A (en) | 1955-02-23 |
Family
ID=6634591
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1893/53A Expired GB724661A (en) | 1952-01-22 | 1953-01-22 | Improvements in or relating to arrangements for the operation of three-phase motors with an auxiliary frequency lower than the normal operating frequency |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB724661A (en) |
-
1953
- 1953-01-22 GB GB1893/53A patent/GB724661A/en not_active Expired
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