Dc Moter

What is an Induction Motor? An induction motor (also known as an asynchronous motor ) is a commonly used AC electric motor . In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction from the rotating magnetic field of the stator winding. The rotor of an induction motor can be a squirrel cage rotor or wound type rotor. Induction motors are referred to as ‘asynchronous motors’ because they operate at a speed less than their synchronous speed. So first thing to understand – what is synchronous speed? Synchronous speed is the speed of rotation of the magnetic field in a rotary machine, and it depends upon the frequency and number poles of the machine. The induction motor always runs at speed less than its synchronous speed. The rotating magnetic field produced in the stator will create flux in the rotor, hence causing the rotor to rotate. Due to the lag between the flux current in the rotor and the flux

In a DC motor , an armature rotates inside a magnetic field . The basic working principle of DC motor is based on the fact that whenever a current carrying conductor is placed inside a magnetic field, there will be mechanical force experienced by that conductor . All kinds of DC motors work under this principle. Hence for constructing a DC motor , it is essential to establish a magnetic field. The magnetic field is established by using a magnet. You can use different types of magnets – it may be an electromagnet or it can be a permanent magnet. A Permanent Magnet DC motor (or PMDC motor ) is a type of DC motor that uses a permanent magnet to create the magnetic field required for the operation of a DC motor.