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What are the problems of commutation in a DC generator?
1.resistance commutation 2.e.m.f commutation
What is the difference between current and voltage commutation?
Voltage commutation: This is possible in ac circuits...The thyristor gets turned off by reverse bias (negative half cycle) voltage applied across it. This is also called line commutation. Current Commutation: This is possible in dc circuits ...This type of commutation makes use of auxiliary circuit which contains inductor,capacitor,diode and even a thyristor(auxiliary). This is called Forced commutation.
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.
How does the area of copper-carbon contacts decide the distribution of current in commutation process of DC machine?
Copper carbon decides the distribution of commutation from the rotation. It tells what direction for it flow.
What component of a welding machine changes AC current to DC current?
Yes, it is normal for a welding machine to convert AC voltage to a DC voltage.
Can a fan work on a DC voltage?
Yes, if the fan is designed to work on DC voltage, otherwise no.
Will a photocell work using dc voltage?
it creates a dc current
Can SMPS work in DC supply?
Yes. Input DC voltage would be root2 times the input AC voltage.
What are the difference between choppers and inverters?
chopper transforms ac to dc (dc chopper) while all inverter transform dc to ac commutation used in chopper: forced,load commutation used in inverter:forced(180 vsi),natural or line(120 vsi)
What is commutation in DC generator?
The rotor of a d.c. generator naturally produces an a.c. voltage as it spins. In order to create a d.c. voltage, it is necessary to reverse the machine's output every half cycle -i.e. each time the voltage 'goes negative', so to speak. This is done using a split-ring commutator which is basically a rotating switch. At the same time, the commutator provides a means of connecting a rotating coil with a fixed external circuit.
What commutation in dc generator?
The rotor of a d.c. generator naturally produces an a.c. voltage as it spins. In order to create a d.c. voltage, it is necessary to reverse the machine's output every half cycle -i.e. each time the voltage 'goes negative', so to speak. This is done using a split-ring commutator which is basically a rotating switch. At the same time, the commutator provides a means of connecting a rotating coil with a fixed external circuit.
What is the typical no-load open circuit voltage of a DC arc welding machine?
The typical no-load open circuit voltage of a DC arc welding machine generally ranges from 60 to 80 volts. This voltage is necessary to establish and maintain the arc between the electrode and the workpiece. The specific voltage can vary based on the machine design and application requirements, but it typically falls within this range for effective welding operations.
