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Why is a motor is a reverse function of generator?
from Faraday's laws its clear that when ever there is change in flux, an emf is produced. in a dc motor there are permanent magnets that produce a magnetic flux. If the shaft of the motor is rotated, which in tern rotates the coil that is placed in the magnetic field. Thus, changing the flux that cuts the coil. since there is change in flux an emf is induced.thus, a dc motor can be used as a generator.
Why permanent magnets are curve in dc motor?
To provide a radial magnetic flux.
How speed increases when flux decreases in dc shunt motor?
Increasing flux, torque of the dc motor will be increased and speed of the dc motor will be decreased as speed of the dc motor is inversely proportional to that of the flux and the torque of the dc motor is directly proportional to the flux.
What are industrial applications of DC shunt motors?
Dc shunt motor is a constant flux and constant speed motor . So that it is used in centrifugal pumps ,machine tools ,blowers and fans etc.
What happens to d.c motor when Field is weakened in DC?
when the field winding of dc motor opens the flux is zero so the speed is inversely propotional to speed ,so motor runs at dangerous speed...........
Why dc series motor is always runs at loads?
At no load, the flux is only due to the residual flux, which is very small. the no load speed of dc series motor is very high. so the rotating part of the motor are damaged. hince dc series motor should never be run without motor.
Why is a motor is a reverse function of generator?
from Faraday's laws its clear that when ever there is change in flux, an emf is produced. in a dc motor there are permanent magnets that produce a magnetic flux. If the shaft of the motor is rotated, which in tern rotates the coil that is placed in the magnetic field. Thus, changing the flux that cuts the coil. since there is change in flux an emf is induced.thus, a dc motor can be used as a generator.
Why permanent magnets are curve in dc motor?
To provide a radial magnetic flux.
Can DC motor runat sysnchronous speed?
No they don't. A rotating magnetic flux is required which the dc motors cannot attain.
Do GFI work on DC?
Typical household GFIs are designed using cheap magnetics which would saturate given a DC leakage current. This means it will not be sensitive to a slow changing DC leakage current. a DC GFI can be made and does exist, but it will require a sensor that can sense DC flux without being saturated, such as a hall effect sensor chip.
How speed increases when flux decreases in dc shunt motor?
Increasing flux, torque of the dc motor will be increased and speed of the dc motor will be decreased as speed of the dc motor is inversely proportional to that of the flux and the torque of the dc motor is directly proportional to the flux.
What are industrial applications of DC shunt motors?
Dc shunt motor is a constant flux and constant speed motor . So that it is used in centrifugal pumps ,machine tools ,blowers and fans etc.
What happens to d.c motor when Field is weakened in DC?
when the field winding of dc motor opens the flux is zero so the speed is inversely propotional to speed ,so motor runs at dangerous speed...........
What change occurs in flux when load increases in DC shunt motor?
no change occurs because the flux is controlled by the supply and not the load on the generator. thus flux doesnot change unless the supply changes
Why is the speed of dc shunt motor practically constant under the normal condition?
The speed of dc shunt motor is practically constant under the normal condition because the field flux is constant.
What are the differences between the natures of dc flux and ac flux?
dc flux is caused by dc current (flux and current are proportional), it is a constant value. Put an inductor (or transformer winding) across a battery and you will get dc flux. ac flux is caused by ac current (flux and current are proportional), it is a moving value, the flux moves with the current, typically cyclical but the waveform is arbitrary as long as we're moving.
When pole flux of dc motor is zero what is its speed?
when the pole flux is zero there is no induced emf in the armature conductor of dc machine as a result of this there is no back emf for controlling action so speed become dangerously high or we can say it will be infinite.
