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Why carbon brushes are used in DC machines?
Carbon brushes used in DC machines because carbon is soft material and it does not generate spikes when contact with commutator
What is commutation in DC machines?
It is the process of conversion of generated ac voltage into the armature of a dc generator to dc voltage at the terminal of the dc generator by use of pair of brushes and commutator. OR It is the process of conversion of given dc voltage at the terminal of the dc motor to ac voltage in the armature windings in a dc motor by use of pair of brushes and commutator.
Why are the brushes of a dc machine always placed at the neutral points?
The function of brush is to collect current from rotating commutator and supplies the current to external stationary load. The brushes of a DC machine are placed at neutral points because the current in the rotating part drops to zero at the neutral point. If brushes are placed in location other than the neutral points, then the current may be switched off and it causes magnetic field and it may also create voltage spikes and arc at brushes.
What are the Difference between dc motor and dc generator?
a motor Will do work by consuming power a generator is just the opposite
What are brushes with reference to DC motors?
Bushes, with reference to DC motors is a brushed DC motor which is a motor that designed to run from a direct current (DC) power source. This type of motor is an internally committed electric motor.
Why carbon brushes are used in DC machines?
Carbon brushes used in DC machines because carbon is soft material and it does not generate spikes when contact with commutator
What is commutation in DC machines?
It is the process of conversion of generated ac voltage into the armature of a dc generator to dc voltage at the terminal of the dc generator by use of pair of brushes and commutator. OR It is the process of conversion of given dc voltage at the terminal of the dc motor to ac voltage in the armature windings in a dc motor by use of pair of brushes and commutator.
What is mechanical loss in dc machines?
Friction and windage causes mechanical loss in DC machines.
What is the principles of DC machines?
All DC machines are works based on the principle of FARADAY'S LAW OF ELECTROMAGNETIC INDUCTION.
What is the function of pole shoes of dc motor?
To overcome the sparking at brushes.
Why brushes are made of only carbon graphite in dc machines?
The brushes are made up of carbon because it has low friction as compare to other materials and cheaply also, but carbon has high resistance due to which output can vary. So we mix carbon with copper metal to reduce resistance. Note that we cannot use copper only for brushes because it creates more friction with commutator.
How can the field coils of DC machines be connected with self excited machines?
No
How many types of DC machine?
05 types of dc machines
How is DC shoes made?
machines
What part of a DC motor should be inspected most frequently?
Commutator and brushes.
What part of a DC motor on the armature is responsible for connecting brushes to a coil?
commutator
If you connected the test leads of an ohmmeter to the brushes of a DC electric motor what reading would you read?
If you connect the test leads to the brushes of a DC electric motor, you would typically measure the resistance across the armature circuit. This reading can help you determine the condition of the armature winding, the brushes, and the connections.
