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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
Most of the brushes that I am using are Manufactured by GE but I cannot find them there.Where can I find reliable data sheets for dc motor carbon brushes including the brush's current density rating?
TMNT
Why are the brushes of DC motor motor made of carbon rather than copper?
Carbon is much stronger and because the motor commuter is spinning copper brushes will wear off quickly.
Why you use carbon for making connection to DC motor?
Carbon brushes are used to connect the rotating commutator of a DC machine with the external circuit. Carbon is selected becauseit has a negative temperature coefficient of resistance, i.e. its resistance falls with a rise in temperature.it is self-lubricating.it quickly shapes itself to the curve of the commutator.
What part of a DC motor should be inspected most frequently?
Commutator and 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.
Why carbon is used for making bruses of dc machines?
Carbon is used for brushes becauseit has a negative temperature coefficient of resistance -i.e. its resistance falls as its temperature increasesit is self-lubricatingit easily takes on the shape of the commutator/slip rings, improving area of contact
What is the main composition of the brushes of a dc motor?
Carbon Brush yang terbuat dari campuran tembaga dan Zinc atau lainnya.
What is the basic difference between carbon brush of AC slip ring motor and carbon brush of Direct current commutator motor?
The main difference is in how the carbon brushes are used. In an AC slip ring motor, the brushes transfer power to the rotor through slip rings, whereas in a DC commutator motor, the brushes switch the current direction on the rotating armature to maintain torque and rotation. Additionally, the design and composition of the brushes may vary to accommodate the specific requirements of each motor type.
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 is AC more widely used compared to DC?
The Electricity when generated is always in AC form. Some additional devices (like commutator, carbon brushes etc) to be used to conevrt the AC to DC form. It is very cumbersome, unviable. Concept of transformer is feasible only in AC form. Induction motor which a most common application is based on AC. Hence AC usage come into practice. Neverthless DC has certain advantages like less losses. Hence you find many high voltage transmission system is on DC voltage. Only direct source of DC is from Batteries.
Does a ac generator have a brush?
AC generators (alternators) usually have a dc supply to the rotor coils, supplied through slip-rings with carbon brushes. Because the slip-rings can be made very smooth the life of the brushes is greatly extended when compared with brushes on the commutator of a dc motor or an ac commutator motor. Cars generate electrical power with a three-phase AC alternator, connected directly to the battery through rectifier diodes. The alternator voltage is controlled by the voltage regulator, which works by controlling the dc supply to the rotor.
