# What is 4 pole DC machine?

## What is 4 pole DC machine?

It is cylindrical in shape with slots to carry armature winding. The armature is built up of thin laminated circular steel disks for reducing eddy current losses. Armature core is made of silicon steel laminations which are insulated from each other by insulating varnish coating.

## What is emf equation of DC machine?

Eb = PΦNZ / 60A Ф is the Flux per pole. N is the Speed of motor in (RPM) Z is the Number of conductors. A is the Number of parallel paths.

**What is the formula of back emf?**

The back emf is calculated based on the difference between the supplied voltage and the loss from the current through the resistance. The power from each device is calculated from one of the power formulas based on the given information. The back emf is ϵi=ϵS−I(Rf+REa)=120V−(10A)(2.0Ω)=100V.

### What is the formula of emf equation in wave wound DC generator?

As the armature rotates, a voltage is generated in its coils. In the case of a generator, the emf of rotation is called the Generated emf or Armature emf and is denoted as Er = Eg. In the case of a motor, the emf of rotation is known as Back emf or Counter emf and represented as Er = Eb.

### What is 2 pole dc machine?

Figure 5.13 shows a 2 Pole Elementary DC Machine with a single coil rotating armature. It may be seen that the field winding is stationary with salient poles whose pole-shoes occupy a major part of the pole-pitch. An alternating emf is induced in the coil due to rotation of the armature past the stator (field) poles.

**What is dc machine PDF?**

A DC Machine is an electro-mechanical energy conversion device. There are two types of DC machines; one is DC generator, and another one is known as DC motor. A DC generator converts mechanical power (ωT) into DC electrical power (EI), whereas, a DC motor converts d.c electrical power into mechanical power.

#### What is DC motor equation?

DC Motor Voltage Equation Consider a DC shunt motor as shown in the figure. Let, V=AppliedDCvoltage. Eb=BackEMF. R−a=Resistanceofthearmaturecircuit.

#### What is equation of back emf of DC motor?

For a DC motor, magnitude of the back emf is given by the same emf equation of a dc generator i.e. Eb = PɸNZ / 60A.

**How do you calculate back emf of a dc machine?**

Net voltage = supply voltage + back EMF Back EMF = -45 V. Net voltage across the motor, calculated according to Ohm’s Law (V = I x R = 10 A x 15 Ω), = 150 V.

## What is the formula for back emf of DC shunt motor?

The Induced Back EMF Shunt DC Motor Using Voltage formula is defined as the electromagnetic force that resists Induced EMf of the shunt DC motor and is represented as Eb = V-(Ia*Ra) or Back emf = Voltage-(Armature Current*Armature Resistance).

## What is the rpm of a 2 pole motor?

approximately 3600 rpm

Two pole AC motors operating at 60 Hz will always run at approximately 3600 rpm, and four pole AC motors will have speeds around 1800 rpm.