0
The most common faults are i know as below:
a) brush carbon arcing due to high current and friction;
b) dust or dirt;
c) over temperature due to high ambient and excessive use;
d) overload and winding insulation failure
e)inadequate protection against heat and poor ventilation
What else can I help you with?
Is a DC motor single excited or double excited?
It is doubly excited if it is sparately excited dc motor, singly excited if it is self excited machine
Advantage of dynamic braking in dc machines?
This helps the machine to stop easier. It is a much easier process to use and safer for everyone involved in the process.
Where The core losses in a dc machine occur in?
in a dc machine core losses occur both in stator and rortor but stator core losses are negligible as compared to rotor core losses because in stator constant dc flux is given and the statot conductor is stationary so there are no eddy losses and as the flux is stationary there are no hysteresis loassses also but in rotor armature winding is placed so here alternating field is induced which cuts the rortating conductors of rotor thereby inducing eddy as well as hysteresis losses fo any more info. contact zombie
When is it important to make sure to match the polarity of the meter leads to the polarity of the circuit being tested?
This is important when meter cannot display negative values, e.g. it is analogous meter with scale. Most digital meters can display negative values. P.S. I am amateur in elecrtonics.
What is DC signal?
(This answer assumes that this is a straightforward question about the electrical term "DC". If it is about something else, feel free to explain in the discussion area and I will try to answer.) "DC" refers to Direct Current. This is as opposed to "AC", which stands for Alternating Current. Direct Current involves a flow of current (electron flow) in one direction only. The delivery of power to an electronic circuit is by far the most common application of DC current in your house, for example. (There are some high power DC power delivery systems used in industry as well as other non-domestic applications such as welding.) Alternating Current involves a flow of current that reverses direction periodically, that is, at some "frequency". Historically, the vast majority of "signalling" was done with AC. This corresponds to what we commonly call "analog" today, including audio, radio, and telephone communications. With the advent of the digital age, digital signal transmission (in the case of signaling over most wires and circuit traces) could be considered to be switched DC, since the current direction does not reverse, i.e., during the signalling of a digital "one", current flows in one direction, while during the signalling of a digital zero no current flows (so the direction does not alternate, it only stops and starts). (By no means all digital signalling is DC however. All wireless transmission could be considered to be AC, and signalling in systems such as USB and FireWire is AC.)
What is the important of brush in DC machine?
The slip rings are the most important brush in DC machine.
What motor is NOT suitable for use as a DC machine?
What motor is NOT suitable for use as a DC machine?
What is swinburne's test of DC shunt motor?
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
What is an dc meachine?
it is a machine which operates on the dc power source.
How many types of DC machine?
05 types of dc machines
Is there a fault line in Washington D.C.?
There is no known major fault line to exist in the Washington DC area.
Derive emf equation of a DC machine?
equation of ac machine
How do you make DC generator?
A DC generator is a DC machine that is driven by an external rotating force. It is constructed the same as a DC motor.
Whether a pmbldc motor is a dc or ac motor?
PMBLDC machine is actually an ac machine and due to power electronics components it's output is dc ,so therefor it is called 'dc'
Why are the losses in a dc machine important to know?
Losses mean energy losses, which cost money, and most people like to know how much a machine is going to cost to run.
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.
How AC is converted into DC in welding machine?
rectifyer
