GB894583A - Improvements in and relating to electric motor equipments - Google Patents
Improvements in and relating to electric motor equipmentsInfo
- Publication number
- GB894583A GB894583A GB920358A GB920358A GB894583A GB 894583 A GB894583 A GB 894583A GB 920358 A GB920358 A GB 920358A GB 920358 A GB920358 A GB 920358A GB 894583 A GB894583 A GB 894583A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- control
- voltage
- error
- 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
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
- B66B1/30—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical effective on driving gear, e.g. acting on power electronics, on inverter or rectifier controlled motor
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
894,583. Control of motors. ENGLISH ELECTRIC CO. Ltd. March 23, 1959 [March 21, 1958], No. 9203/58. Class 38 (3). [Also in Group XXXV] In a motor control system a bi-stable amplifying device responsive to a control signal, dependent on a deviation of the motor speed from a reference value, energizes a change-over device in one sense so that the motor operates as a regenerative brake and in the other sense so that the motor drives a load. In an embodiment, Fig. 1, a control lever 18 positions a slider 17a of a speed reference potentiometer 17 and actuates change-over contacts 32, 33 to apply the correct polarity for the selected direction of rotation, to a control winding 16a of a bi-stable amplifying device 16. The voltage at the slider 17a is compared with the voltage of a tacho-generator 19, driven by an armature 10a of a direct-current winding motor 10, and the resultant voltage is fed to contacts 20a, 20b and to an error sensing device 28 which saturates at a predetermined resultant voltage. The amplitude-limited error signal is fed to a second control winding 16b and at a predetermined amplitude triggers the bi-stable amplifying device 16 to determine the energization of a field winding 14a of an exciter 14 through a magnetic amplifier 15. The exciter 14 supplies a field winding 10b of the motor 10. Polarized relays 29a, 29b are energized by the voltage drop across a resistor 30 in the supply to the field winding 10b and the appropriate relay closes changeover contacts 20a or 20b to apply the resultant voltage as an error signal to a negative error suppressing device 21 that passes positive amplitude error signals to an operating coil 22a of a grid control device 22 controlling a current converter 11. With increase in the positive error signal, the converter changes operation from an inverter, the motor then acting as a regenerative brake, to a rectifier, when the motor drives a load. In a modification, Fig. 2 (not shown), the magnetic amplifier 15 energizes polarized relays that reverse the connections to the armature 10a with respect to the current converter 11 and after a delay change-over contacts 20a, 20b. In another embodiment, Fig. 3, the error signal through the negative error suppressing device 21 operates an electrical transducer 108 to control the speed of a slip-ring induction motor 100 by varying the value of a resistor in the rotor circuit. At a predetermined amplitude and sense, the resultant voltage triggers the bi-stable device 16 and through the magnetic amplifier 15 operates a polarized relay 34 or 35. The polarized relay 34 closes a contactor 106 to apply a direct current or low-frequency alternating current to a stator of the motor 100 which then acts as a brake on the load. The polarized relay 35 closes a contactor 102 or a contactor 103, as selected by the control lever 18, to energize the stator of the motor 100 from a mains supply 104. Specification 892,231 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB920358A GB894583A (en) | 1958-03-21 | 1958-03-21 | Improvements in and relating to electric motor equipments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB920358A GB894583A (en) | 1958-03-21 | 1958-03-21 | Improvements in and relating to electric motor equipments |
Publications (1)
Publication Number | Publication Date |
---|---|
GB894583A true GB894583A (en) | 1962-04-26 |
Family
ID=9867400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB920358A Expired GB894583A (en) | 1958-03-21 | 1958-03-21 | Improvements in and relating to electric motor equipments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB894583A (en) |
-
1958
- 1958-03-21 GB GB920358A patent/GB894583A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1419544A (en) | Dc electric motors | |
GB614157A (en) | Improvements in and relating to electrical apparatus for testing the power transmitted by tractive elements such as the wheels of a vehicle | |
US2447654A (en) | Torque control system for electric reel motors | |
GB894583A (en) | Improvements in and relating to electric motor equipments | |
US2329538A (en) | Control system | |
US2246905A (en) | Constant speed series wound motor | |
US2433130A (en) | Speed control for ward leonard systems | |
GB717253A (en) | Improvements in or relating to electric motor control systems | |
US2785359A (en) | Variable voltage motor control | |
US2743405A (en) | Variable voltage motor control | |
US2838724A (en) | Electrical servo-mechanisms | |
US2589279A (en) | Speed responsive plugging for electric motors | |
US3774094A (en) | Control circuit for regulating electric motor speed | |
GB1532032A (en) | Electric braking apparatus for alternating current motors | |
US2943250A (en) | Motor control system | |
US2785357A (en) | Dynamic braking for ward leonard system | |
US1886773A (en) | Motor control system | |
ES215849A1 (en) | Improvements relating to electric motor control systems | |
US2214604A (en) | Electric motor control system | |
GB740256A (en) | Improvements in or relating to control systems for electric motors | |
GB738310A (en) | Improvements in or relating to control systems for electric motors | |
GB1000274A (en) | Improvements in and relating to control systems for dynamo-electric machines | |
GB892231A (en) | Improvements in and relating to d.c. electric motor equipments | |
GB782645A (en) | Improvements in or relating to electric motor control systems | |
GB815480A (en) | Improvements in or relating to control systems for alternating current electric motors |