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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 staggering of brushes in dc machines?
Staggering of brushes is nothing but displaying the positive brush sets in one direction and negative brush sets in the other direction. This ensures uniform wearing of commutator segments or surface (and avoids steps like between brush sets).
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 most used in dc?
Carbon is used because it is soft and does not damage the commutator. This means that the brushes must be replaced at intervals, and the powdered carbon scraped out from between the segments of the 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
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.
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 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.
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
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 staggering of brushes in dc machines?
Staggering of brushes is nothing but displaying the positive brush sets in one direction and negative brush sets in the other direction. This ensures uniform wearing of commutator segments or surface (and avoids steps like between brush sets).
Why DC used for electronics?
DC means direct current it is used for practically all electronic components in Computers,gaming machines and I pod's etc
What is mechanical loss in dc machines?
Friction and windage causes mechanical loss in DC machines.
