What is no load terminal voltage?
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What is no load terminal voltage?
The no load voltage is the terminal voltage when zero current is drawn from the supply, that is, the open circuit terminal voltage. Some portion of voltage drops down due to internal resistance of voltage source.
What is terminal voltage in DC generator?
Terminal Voltage in Generators The terminal voltage is equal to zero when there is no load in the electric circuit. The reason terminal voltage is equal to zero is no electric current flowing throwing through the circuit when there is no load is given to the circuit for a series wound DC generator.
Can a DC series generator excite on no load?
Hence based on above discussion it is advised that DC Series motor should not operate at no load condition.
Can Series DC motor start at no 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.
What is the ideal no load speed for a DC series motor?
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.
How do you calculate no load DC voltage?
No load current for DC motor = 0.25 x Motor Full load current.
How do you find the terminal voltage of a DC generator?
- As the name suggests, terminal voltage is the voltage measured across DC machine’s terminals.
- i.e.,
- Terminal Voltage = Back EMF + Armature Current * Armature Resistance.
- Back EMF is governed by the EMF equation of a DC machine .
Is it possible to run DC series motor on no load?
Thus from equation (2), it is clear that speed of DC Series Motor is inversely proportional to Armature Current Ia. 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.
What is no load condition in DC motor?
No load means there is no opposing torque on their rotors. They then run at their rated speeds ( expect for the dc series motor whose speeds go dangerously high during no load condition). The power taken from the supply under no load is consumed by the losses i.e., no load losses.
Why do DC series motors start loading?
When the motor is connected across the supply mains without load, it draws small current from the supply mains. This current will flow through the series field and armature, the speed tends to increase so that back emf may approach the applied voltage in magnitude. This cause again increases the speed so the back emf.