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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
Open this folder and view contents3. Execution of rotating electrical machines
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
close this folder7. Single-phase alternating current motors
Open this folder and view contents7.1. Single-phase asynchronous motors (single-phase induction motors)
close this folder7.2. Three-phase asynchronous motor in single-phase operation (capacitor motor)
View the document7.2.1. Assembly and operating principle
View the document7.2.2. Operational behaviour
View the document7.3. Split pole motors
Open this folder and view contents7.4. Single-phase commutator motors (universal motors)
Open this folder and view contents8. Transformer
 

7.2.2. Operational behaviour

Initial torque is only some 30 per cent of rated torque. Consequently, in some cases it becomes necessary to parallel switch a starting capacitor of approx. 150 F/kW to the operating capacitor. However, because of its excessive current acceptance after starting, this operating capacitor should be switched off, for example by means of a centrifugal switch.

The magnitude of the operating capacitor must be selected in accordance with a motor power of some 70 F/kW and in line with voltage level.

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