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DC Motor & DC Generator (DC Motor ((Higher number of armature loops…

- - - - Highly permeable steal layers are used to enhance magnetic flux
    - - DC motor with Electromagnet and field coil surround it
        
        The field coil has 2 way to connect to rotor wingdings
        
        Parallel connection
        
        Shunt Motor
        
        Series connection
        
        Series Motor
    - - The internal EMF will be induced that oppose the input voltage, reduce the armature current
        
        I = [EMF(in) - EMF(back)]/R
        
        Back EMF directly proportional to Speed of Rotor
        
        Large DC motor need a proper starting mechanism, as the starting of motor will has slow speed, causes the low amount of Back EMF and high amount of armature current, which will burn out the rotor
- - - - Made up of copper wire
        
        Magnetic flux produced when current pass through
    - - Cut the magnetic flux of the field magnet
        
        Provide low reluctance for flux
    - - Pole core + Pole shoes
        
        Act as support for field coil
        
        Large cross section, reduce reluctance of magnetic path
    - - Lap windings
        
        No. of paralle path = No. of path = No. of brushes
        
        High current, low voltage machines
        
        Wave windings
        
        No. of paralled path = 2
        
        High voltage, low current machines
    - - Protecting shield for generator and supporting for poles
    - - Facilitate the collection of current from armature conductors
        
        Convert AC current to Unidirectional Current
        
        Segment s are insulated by layers of mica
    - - Collect current from commutator
        
        No. of brushes per Spindle depends on magnitude of current to be collect
    - - Sleeve bearing are used to reduce bearing wear