GB711962A - Improvements in and relating to the control of electric motors - Google Patents
Improvements in and relating to the control of electric motorsInfo
- Publication number
- GB711962A GB711962A GB540751A GB540751A GB711962A GB 711962 A GB711962 A GB 711962A GB 540751 A GB540751 A GB 540751A GB 540751 A GB540751 A GB 540751A GB 711962 A GB711962 A GB 711962A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contacts
- levers
- spindle
- motor
- cam
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23H—GRATES; CLEANING OR RAKING GRATES
- F23H11/00—Travelling-grates
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
711,962. Controllers; time switches. BRITISH THOMSON-HOUSTON CO.. Ltd. March 6, 1952 [March 6, 1951], No. 5407/51. Classes 38(3) and 38(5) A device controlling the intermittent energization of a main electric motor comprises a shaft E which carries similar cams J, K, and is driven by a pilot motor through shaft D, chain F, and sprockets G, H. The cam J co-operates with diametrically disposed contact-operating levers (one of which is shown at M) mounted on the casing of the device, whilst the cam K co-operates with another pair of diametrically disposed contactlevers, such as the lever N, mounted with their contacts on a plate P rotatable with spindle R by means of handwheel S. The movable contacts are connected to the motor circuit through slip-rings T and brushes U. When the levers M, N, are aligned their contacts operate in unison so as to close for one half of a revolution of spindle E and open for the other half. The lever N may be moved so that its contact closes in advance of that of the lever M and opens earlier, the period during which both contacts are closed being reduced and the speed of the main motor decreased. The levers diametrically opposed to the levers M, N, are operated half a revolution behind the latter, and their contacts are connected in series with each other and in parallel with the contacts of levers M, N, so that the main motor will be energized twice during a revolution of the spindle E. Thus, adjustment from a condition of continuous energization of the main motor when each pair of contacts are aligned, to a condition of zero entergization when the pair of contacts are 180 degrees apart, is possible. When the controlled motor drives a chain-grate stoker of a boiler, the spindle R may be coupled to a fan speed regulating means, and the levers co-operating with the cam J made manually adjustable, Fig. 6 (not shown). The cams J, K, may be replaced by a drum switch. Specification 683,152 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB540751A GB711962A (en) | 1951-03-06 | 1951-03-06 | Improvements in and relating to the control of electric motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB540751A GB711962A (en) | 1951-03-06 | 1951-03-06 | Improvements in and relating to the control of electric motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB711962A true GB711962A (en) | 1954-07-14 |
Family
ID=9795591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB540751A Expired GB711962A (en) | 1951-03-06 | 1951-03-06 | Improvements in and relating to the control of electric motors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB711962A (en) |
-
1951
- 1951-03-06 GB GB540751A patent/GB711962A/en not_active Expired
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