What affects motor speed?

The rotating speed of an electric motor depends on two factors: its physical construction, and the frequency (Hz) of the voltage supply. Electrical engineers select the speed of a motor based on the needs of each application, similar to how the mechanical load determines the horsepower required.

Why is the terminal voltage less than the generated EMF of a DC generator?

Terminal voltage V is less than the generated emf Eg due to voltage drop in the armature circuit. Therefore, external characteristic curve lies below the internal characteristic curve. External characteristics are very important to determine the suitability of a generator for a given purpose.

What is the function of brushes in electric generator?

A brush or carbon brush is an electrical contact which conducts current between stationary wires and moving parts, most commonly in a rotating shaft. Typical applications include electric motors, alternators and electric generators.

What happens to a generator when the load is changed?

A few things happen on sudden load change. Load is switched. There is suddenly more/less demand, lowering/raising the voltage of the generator. The automatic voltage regulator will change the magnetic field strength of the rotor.

How does a brushed DC motor work?

The entire process is driven by applying electrical power to the coil, with the source voltage having a direct relationship to the motor’s output speed. To understand this relationship between voltage and speed, let’s look at a typical brushed dc motor circuit. DC motor circuit.

How is the current output of a generator determined?

The current output of a generator is determined by its load, as long as the load doesn’t exceed the maximum capacity of the generator’s prime mover (engine) plus the conversion losses of the actual generator.

How does a generator regulator work?

There is suddenly more/less demand, lowering/raising the voltage of the generator. The automatic voltage regulator will change the magnetic field strength of the rotor. The governor (speed regulator) will respond to the changed load conditions.