Why DC series motor is never used without any load?
A series motor should never be started at no load. With no mechanical load on the series motor, the current is low, the counter-EMF produced by the field winding is weak, and so the armature must turn faster to produce sufficient counter-EMF to balance the supply voltage. The motor can be damaged by overspeed.
Can a house run on DC?
But even they can be more efficient running on DC, thanks to Variable Frequency Drives or VFDs. According to the Electric Power Research Institute, As motor-operated loads become increasingly controlled through VFDs — very little will remain in a house that really needs AC power.
What is the main advantage of a series DC motor?
The series motor has the highest starting torque for a given power rating. When the motor is overloaded, the speed drops and the torque increases. While delivering high torque during an overload, the series motor draws less current and power from the source compared to a shunt or compound DC motor.
Can you run a house on 12V?
Using 12V DC for home power requires some adjustments, but generating your own energy will protect you from rising utility rates. Sun and wind energy are the go-to sources for 12V DC home power. You will need a control panel to manage your system if you’re living on 12V DC power.
Why is DC series motor should not be started at no load?
Speed of DC Series Motor ωm = Very high, which is also clear from the Speed Current Characteristics of DC Series Motor as shown in figure above. Therefore if the DC Series Motor is started at No Load then the speed of DC Series Motor will become dangerously high which will definitely damage the DC Series Motor.
How are DC series motor operating characteristics determined?
Explanation: From speed current characteristics for a DC series motor, we get that speed is inversely proportional to flux. If flux direction is reversed, same flux will be available with negative sign in vectors, thus, speed will remain same but with the other direction.
Which is DC series motor will be highest?
3. No-load speed of which of the following DC motor will be highest? Explanation: At no load, armature current tends to zero, flux φ tends to zero, where speed is inversely proportional to the flux, speed will tend to infinity. Thus, no load speed of DC series motor is highest.
Why not to use DC power directly for home operation?
Recent PM motors cannot also be driven directly by ac without converters. It implies dc is enough for these applications. All reason of applying ac are to keep the conventional apparatus in electric power network, and to feed power companies. Multiple conversion will waist energies in the steps.