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What is the similarity between an AC induction motor and an AC synchronous motor?
Only Stator winding is similar in both the cases.
How is the synchronous motor made self starting?
The synchronous motor is made self starting by providing a special winding on the rotor poles, known as damper winding or squirrel cage winding. AC supply given to the stator produces a rotating magnetic field which causes the rotor to rotate, therefore, in the beginning synchronous motor provided with damper winding starts as a squirrel cage induction motor. The exciter moves along the rotor. When the motor attains about 95%of synchronous speed, the rotor winding is connected to exciter terminals and the rotor is magnetically locked by the rotating field of the stator and the motor runs as a synchronous motor. While starting a synchronous motor, the field winding must be shorted through a suitable resistance so that the induced voltage is distributed throughout the whole winding and no part is subjected to the high voltage induced in the entire winding.
How schrage motor works?
The Schrage Motor, Model 8234, is a variable-speed polyphase AC motor with both high torque and efficiency. It requires standard three-phase power. The Schrage Motor is used in a variety of industrial applications, such as packaging machinery, conveyors, pumps, and knitting machines, where full torque is needed over a variable speed range. The motor is basically a special wound-rotor motor in which a built-in variablefrequency source is connected to one winding, while the network frequency is applied to the other winding. The voltage of the variable frequency source can be set over a certain range and the resulting speed of the motor depends upon this setting. The Schrage Motor circuit diagram pictured in Figure 1 shows that the primary winding is on the rotor and the insulated secondary winding is on the stator. On the rotor, there is a tertiary, or control, winding, which is connected to the secondary windings on the stator via a commutator and three pairs of adjustable brushes lying on the commutator. When the brushes in each pair move apart or closer together, a variable voltage is applied to the secondary winding by the tertiary winding. The change in voltage varies the speed of the motor below and above synchronous speed.
Which statement describes an AC generator?
AC generator is a rotating machine with a rotor and stator winding, driven by another prime mover, which generates alternating current at a specified voltage.
How do you change an ac motor to a DC motor?
Ac motor have slip ring, to remove the slip ring,connected to the commutator its a dc motor.
What do you understand about the stator of an AC motor?
AC motor has two main winding components - stator and a rotor. Stator winding is stationary where as rotor winding is on rotating part.
What is the similarity between an AC induction motor and an AC synchronous motor?
Only Stator winding is similar in both the cases.
When the dc motor is connected across an AC supply then?
It depends on the construction of the motor. If the field winding is connected in series with the armaturewinding, the motor is like a universal motor and will probably operate normally. If the field winding is connected in parallel with the armature, the motor will not run, but will draw current, make noise and get hot.
How is the synchronous motor made self starting?
The synchronous motor is made self starting by providing a special winding on the rotor poles, known as damper winding or squirrel cage winding. AC supply given to the stator produces a rotating magnetic field which causes the rotor to rotate, therefore, in the beginning synchronous motor provided with damper winding starts as a squirrel cage induction motor. The exciter moves along the rotor. When the motor attains about 95%of synchronous speed, the rotor winding is connected to exciter terminals and the rotor is magnetically locked by the rotating field of the stator and the motor runs as a synchronous motor. While starting a synchronous motor, the field winding must be shorted through a suitable resistance so that the induced voltage is distributed throughout the whole winding and no part is subjected to the high voltage induced in the entire winding.
Working principle of ac motors?
Michael Faradeys laws of electromagnetic induction:When a current is passed through stator winding, an alternating flux created on the stator winding which in turn cuts a rotor winding(wire wound motor)/short circuited copper bar(squirrel cage motor), then a current flows through it and as above one motors works.
What will happen of you give AC supply to stator winding of DC generator?
why the supply is given to the stator of dc generator give answer
What is induction motor in physics?
An induction motor consists of a rotor winding and stator winding. Rotor windings are short circuited and stator winding are given electrical AC supply .Now lets do the physics behind it . As the current starts to flow in the stator winding , magnetic flux start to produce around it . due to it's alternating nature that flux varies and according to farady law emf is induced in the rotor winding .Since the rotor winding is short circuited the current circulates in it .And when a current carrying conductor is placed in magnetic field it experiances a force and hence if start to rotate.
Why is the rotation of a fan only in one direction although it is connected to an AC supply?
The direction of the motor is dependent on the way the stator coils are wound.
How schrage motor works?
The Schrage Motor, Model 8234, is a variable-speed polyphase AC motor with both high torque and efficiency. It requires standard three-phase power. The Schrage Motor is used in a variety of industrial applications, such as packaging machinery, conveyors, pumps, and knitting machines, where full torque is needed over a variable speed range. The motor is basically a special wound-rotor motor in which a built-in variablefrequency source is connected to one winding, while the network frequency is applied to the other winding. The voltage of the variable frequency source can be set over a certain range and the resulting speed of the motor depends upon this setting. The Schrage Motor circuit diagram pictured in Figure 1 shows that the primary winding is on the rotor and the insulated secondary winding is on the stator. On the rotor, there is a tertiary, or control, winding, which is connected to the secondary windings on the stator via a commutator and three pairs of adjustable brushes lying on the commutator. When the brushes in each pair move apart or closer together, a variable voltage is applied to the secondary winding by the tertiary winding. The change in voltage varies the speed of the motor below and above synchronous speed.
How the direction can change of Permanent split capacitor motor?
A single speed permanent split capacitor AC induction motor has two separate pairs of series wound stator windings arranged at right angles to each other around the central rotor. The main run winding is connected directly to the AC power source while the secondary start winding is connected to the same source with a capacitor in series with it. The capacitor causes an electrical phase shift to the power in the start winding relative to the run winding, to produce a rotating magnetic field around the rotor which can start it turning. Since the capacitor remains in the circuit while the motor is running it's called a permanent split capacitor design.
How many types of winding are used in AC and DC motors?
IN DC MOTORThere are 2 types of windings:1. Field windingOn poles core which are on stator body.These are always concentrated type.2. Armature windingOn rotor on motor may be simplex or multiplex and lap or wave connected.IN AC (Synchronous ) MOTOR3-phase star or delta connected on stator (armature ) suppliedby 3 phase may be concentrated or distributed (usually preferred) .Rotor (field ) has concentrared in salient pole type nd distributed in cylindrical type supplied by DC supply.IN AC ( Induction ) MOTOR3-phase (star or delta connected) distributed winding on stator and wound rotor .In squirrel cage rotor short circuted copper bars are used.
Answering Which one is a separately excited generator - ac generator or dc generator?
Excitation is the phenomenon by which you control the excitation of field winding of a generator. In DC generator field winding is placed on stator and this field winding can be self excited or seperately excited depending upon the type on generator used. AC generators can also be self excited or seperately excited type but field winding is placed on rotor nad armature winding on stator.
