GB734746A - Improvements in and relating to electric relays - Google Patents
Improvements in and relating to electric relaysInfo
- Publication number
- GB734746A GB734746A GB29948/53A GB2994853A GB734746A GB 734746 A GB734746 A GB 734746A GB 29948/53 A GB29948/53 A GB 29948/53A GB 2994853 A GB2994853 A GB 2994853A GB 734746 A GB734746 A GB 734746A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contacts
- strip
- overload
- plunger
- coil
- 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 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
- H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Generators And Motors (AREA)
- Motor And Converter Starters (AREA)
Abstract
734,746. Controllers; control of A.C. motors; thermal switches; electromagnetic switches. GENERAL ELECTRIC CO. Oct. 29, 1953 [Oct. 30, 1952], No. 29948/53. Classes 38 (3) and 38 (5). A relay for controlling the starting operation of an electric motor having a starting winding 14 and a running winding 11 comprises an overload bimetallic strip 22 and a relay coil 6 with a soft iron plunger 4. A finger 37 extends from the lower end of the plunger and co-operates with a contact arm 33 which is made of high resistance material so that the arm also acts as a heater. The application of current to the leads 17, 26 completes a circuit through the running winding 11, the coil 6, and the overload strip 22. The starting current is sufficient to lift the plunger 4 so that contacts 32 close to complete a circuit through the starting winding 14. Under normal operating conditions, the current in the coil 6 decreases when the motor reaches full speed and the plunger 4 drops to separate contacts 32, so opening the starting winding circuit. If the high-current condition in the coil 6 is prolonged however, the heat derived from the contact arm 33 is added to that generated in the strip 22 which flexes to open the overload contacts 23 and to disconnect the motor. The temperature at which the overload strip will open its contacts is determined by a U-shaped spring 27 having one end positioned in an aperture in the strip and the other end anchored to a pendent arm 29. An adjusting screw 30 is used for regulating the pressure between contacts 23.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US734746XA | 1952-10-30 | 1952-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB734746A true GB734746A (en) | 1955-08-03 |
Family
ID=22113901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29948/53A Expired GB734746A (en) | 1952-10-30 | 1953-10-29 | Improvements in and relating to electric relays |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1094896A (en) |
| GB (1) | GB734746A (en) |
-
1953
- 1953-10-28 FR FR1094896D patent/FR1094896A/en not_active Expired
- 1953-10-29 GB GB29948/53A patent/GB734746A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1094896A (en) | 1955-05-25 |
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