D.C. MOTOR PRINCIPLE

explain DC MOTOR PRINCIPLE .

When a conductor is placed in magnetic field is produced on the conductor.

This force is given by F = B.L.I. Newton.

The direction of the force is given by Fleming's left hand rule.

F = B.LI. newtons

B = magnetic flux density in weber/m2

I = current in conductor in amperes

1 = length of conductor in metres

The electric motor converts electrical energy into mechanical energy or motion by using electromagnetic induction.

When the field magnets of the motor are excited and it's Armature conductors are supplied with current from the supply mains, then they experience a force tending to rotate the armature

Armature conductors under North pole are assumed to carry currents downwards (crosses) and those under South-pole to carry currents upwards (dots). The direction of this force is given by Fleming's Left Hand Rule (also known as motor rule).

. It is seen that each conductor experiences a force F which tends to rotate the armature in anti-clock wise direction as shown by the arrows placed above conductors.

. These forces combine and produce driving torque to keep the armature rotating.

Comments

What is two transistor model of scr ? Explain SCR

Power electronics Two Transistor Model of SCR full explain and pdf. Basic operating principle of SCR, can easily be understood by the two transistor model of SCR , as it is a combination of p and n layers. This is a pnpn thyristor. If we bisect it through the dotted line then we will get two transistors i.e. one pnp transistor with J 1 and J 2 junctions and another is with J 2 and J 3 junctions as shown in figure below. The relation between the collector current and emitter current is shown below Here, I C is collector current, I E is emitter current, I CBO is forward leakage current, α is common base forward current gain and relationship between I C and I B is Where, I B is base current and β is common emitter forward current gain. Let’s for transistor T 1 this relation holds And that for transistor T 2 Now, by the analysis of two transistors model we can get anode current, From equation (i) and (ii), we get, If applied gate current is I g then cathode current will b...

Types of USB and Their Technical Specifications

Types of USB and Their Technical Specifications. USB (Universal Serial Bus) is a standard that was developed to simplify the connection between computers and peripheral devices. Over the years, several types of USB standards have emerged, each offering different capabilities. Here's a comprehensive guide to the different types of USB, including their technical specifications and comparisons. 1. USB Type-A Description : The original and most recognizable USB connector, typically used in computers, chargers, and peripherals. Specifications : Dimensions : 12.0 mm x 4.5 mm Versions : USB 1.0, USB 2.0, USB 3.0, USB 3.1, USB 3.2 Data Transfer Rates : USB 1.0: 1.5 Mbps (Low Speed) / 12 Mbps (Full Speed) USB 2.0: 480 Mbps (High Speed) USB 3.0: 5 Gbps (SuperSpeed) USB 3.1: 10 Gbps (SuperSpeed+) USB 3.2: 20 Gbps (SuperSpeed+) Power Delivery : Up to 2.5W (0.5A @ 5V) for USB 2.0, up to 4.5W (0.9A @ 5V) for USB 3.0 and above. Use Cases : Connecting keyboards, mice, flash drives, external hard d...

regula falsi, method / false position method / explain

regula falsi , method of false position , or false position method In mathematics , the regula falsi , method of false position , or false position method is a very old method for solving an equation with one unknown; this method, in modified form, is still in use. In simple terms, the method is the trial and error technique of using test ("false") values for the variable and then adjusting the test value according to the outcome. This is sometimes also referred to as "guess and check". Versions of the method predate the advent of algebra and the use of equations . As an example, consider problem 26 in the Rhind papyrus , which asks for a solution of (written in modern notation) the equation x + x /4 = 15 . This is solved by false position. [1] First, guess that x = 4 to obtain, on the left, 4 + 4/4 = 5 . This guess is a good choice since it pr...

Study

Search This Blog