SE8005040L - SPEED SWITCH FOR SMALL ELECTRIC SINGLE ENGINE - Google Patents
SPEED SWITCH FOR SMALL ELECTRIC SINGLE ENGINEInfo
- Publication number
- SE8005040L SE8005040L SE8005040A SE8005040A SE8005040L SE 8005040 L SE8005040 L SE 8005040L SE 8005040 A SE8005040 A SE 8005040A SE 8005040 A SE8005040 A SE 8005040A SE 8005040 L SE8005040 L SE 8005040L
- Authority
- SE
- Sweden
- Prior art keywords
- motor
- voltage source
- calculator
- pulse
- computes
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/093—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against increase beyond, or decrease below, a predetermined level of rotational speed
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromechanical Clocks (AREA)
- Control Of Stepping Motors (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The appts. comprises a calculating and alarm circuit which is fitted between the motor voltage source and the motor itself. It has a first pulse calculator controlled by the voltage source frequency, which computes the number of periods in the voltage source. The pulse calculator controls a current adjuster in the motor's supply cable so that it interrupts feed on a regular basis and for short periods within a required time interval. A second such calculator computes the number of induced impulses on the motor feed cable based on the motor's rotation within the above time interval, and activates an alarm circuit when the pulse count exceeds a specific limit. (Provisional Basic advised week E08)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8005040A SE450443B (en) | 1980-07-09 | 1980-07-09 | Primary pulse calculator for AC motor rotation surveillance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8005040A SE450443B (en) | 1980-07-09 | 1980-07-09 | Primary pulse calculator for AC motor rotation surveillance |
Publications (2)
Publication Number | Publication Date |
---|---|
SE8005040L true SE8005040L (en) | 1982-01-10 |
SE450443B SE450443B (en) | 1987-06-22 |
Family
ID=20341402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8005040A SE450443B (en) | 1980-07-09 | 1980-07-09 | Primary pulse calculator for AC motor rotation surveillance |
Country Status (1)
Country | Link |
---|---|
SE (1) | SE450443B (en) |
-
1980
- 1980-07-09 SE SE8005040A patent/SE450443B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
SE450443B (en) | 1987-06-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |
Ref document number: 8005040-4 Effective date: 19930204 Format of ref document f/p: F |