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close this bookElectrical Machines - Basic Vocational Knowledge (IBE - Deutschland; 144 pages)
View the documentIntroduction
Open this folder and view contents1. General information about electrical machines
Open this folder and view contents2. Basic principles
close this folder3. Execution of rotating electrical machines
View the document3.1. Size
Open this folder and view contents3.2. Designs
Open this folder and view contents3.3. Degree of protection
Open this folder and view contents3.4. Cooling
close this folder3.5. Mode of operation
View the document3.5.1. Definition
View the document3.5.2. Operational mode designation
View the document3.5.3. Frequent nominal cycle ratings
View the document3.6. Heat resistance categories
Open this folder and view contents3.7. Connection designations of electrical machines
Open this folder and view contents3.8. Rotating electrical machines in rotational sense
View the document3.9. Rating plate
Open this folder and view contents4. Synchronous machines
Open this folder and view contents5. Asynchronous motors
Open this folder and view contents6. Direct current machines
Open this folder and view contents7. Single-phase alternating current motors
Open this folder and view contents8. Transformer
 

3.5.2. Operational mode designation

Following abbreviations have been stipulated:

S1

permanent operation

S2

short-term operation

S3

intermittent operation with starting or braking influences

S4

intermittent operation with starting influence on temperature

S5

intermittent operation with starting and electric braking influence on the temperature

S6

continuous operation with intermittent loading

S7

uninterrupted operation with starting and electric braking

S8

uninterrupted operation at differing speeds

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