magnetisation characteristic of dc generator is nothing but the open circuit characteristic of dc generator where we determine the operating characteristics of dc machines.it is used to determine the open circuit armature voltage keeping armature current zero,at rated speed and after few laps of time filed current is gonig to be raised from zero.where the armature open circuit voltage is reached above its rated value.
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The slip rings are the most important brush in DC machine.
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............................
05 types of dc machines
Yes, it is normal for a welding machine to convert AC voltage to a DC voltage.
No
The armature voltage is a critical parameter in the determination of performance characteristics for the DC machine. The armature voltage has been shown to be proportional to the magnetic flux density per pole and the armature speed. Thus, the armature voltage will also exhibit nonlinear behavior when saturation occurs. The analysis of DC machine performance typically requires that the characteristics of the armature voltage saturation be known. This information is typically provided in a plot of the armature voltage vs. field current (magnetization curve) for a given operating speed
After magnetization, they remain magnetic due to high levels of Br and Hc.
What motor is NOT suitable for use as a DC machine?
The slip rings are the most important brush in DC machine.
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............................
it is a machine which operates on the dc power source.
05 types of dc machines
yes. dc is used for magnetization. for instance in magnetic relays.. and in other many devices... you can make a search on the web for more.
equation of ac machine
A DC generator is a DC machine that is driven by an external rotating force. It is constructed the same as a DC 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'
Yes, it is normal for a welding machine to convert AC voltage to a DC voltage.