It's self-started. and it has a normal speed less than that of
synchronous. but its speed decreases as the load
increases.
An induction motor has 2 sets of coils in it that are physically displaced from each other. (One is the 'start' winding, connected only during starting, and a 'run' winding, connected whenever the motor is turned on.) The sets of coils have different electrical charactreristics, and when current flows in the coils, they each create their own magnetic fields that are displaced in time by the different values of coil resistance and inductance.
The physical and timing displacements produce a combined magnetic field that rotates through the iron core and copper or aluminum bars of the rotor, inducing a current in the bars ('induction' motor....) creating a magnetic field around the bars that repels the original rotating field. This magnetic repulsion pushes the rotor around, driving the motor (and the load).
The 'start winding' has a high resistance and gets VERY hot if left connected once the motor has started. It is usually turned off (by a centrifugal switch) once the motor is running, and the 'pulsating' field from the 'run' winding keeps the rotor turning.
Some motors use a capacitor (or 'condenser') to enhance the displacement between the magnetic fields (and increase the force of repulsion) to improve starting torque, and a smaller capacitor to improve running torque and smoothness of operation.
Small, low torque motors may not have a 'start' winding, but rather a single turn, short-circuited coil ('shading ring') on part of each of its poles to create a weakly rotating magnetic field - but without a switch or capacitor.
a self starting and three phase ac supply
yes
it depends upon the duty of motor if it is s1 then only one start
Open ended induction motor - i assume you are talking about split phase induction motor. With these motors old style speed controlling method using external resistors can be used. However this is now obsolete.
A single phase induction motor has two sets of coils and a centrifugal start switch. The start winding is in series with the start switch. The start winding provides a rotating magnetic field in one direction enabling the motor to start. The motor can be reversed by reversing the connections of either the start winding or the run winding but not both.
how will you start 3phase inuction motor using star delta stater
capacitive start motors start by themselves however a normal single phase induction motor requires a starter motor to 'kick-start' the motor into action.
yes
A single phase induction motor is mainly used in fans.It is capacitor start capacitor run induction motor.In three phase induction motor squirrel cage induction motor is mainly used in elevators,lifts,cranes.slip ring induction motor is mainly used in electrically driven ships.
Three Phase Induction Motor is self starting motor so you can start it by conneting to power lines directly if the power line capacity is sufficient.
The single phase induction motors are made self starting by providing an additional flux by some additional means. Now depending upon these additional means the single phase induction motors are classified as: 1.Split phase induction motor. 2.Capacitor start inductor motor. 3.Capacitor start capacitor run induction motor. 4. Shaded pole induction motor.
To start an induction motor we have to excite field. The excitation is done by connecting the DC supply to the field winding's.
A single phase induction motor has two sets of coils and a centrifugal start switch. The start winding is in series with the start switch. The start winding provides a rotating magnetic field in one direction enabling the motor to start. The motor can be reversed by reversing the connections of either the start winding or the run winding but not both.
Yes the Induction motor works on Electromagnetic induction principle.
to start the motor and give more current to motor to run
capacitor start induction run motor
Single phase induction motor ( usually capacitor- start type)
Star delta starter