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What else can I help you with?
What type of motor has a stator?
An electric motor has a stator and a rotor. The stator does not move. The rotor rotates inside the stator.
Is the rotor turning with or against the rotating stator field when we interchange the DC armature connection in order to reverse the motor direction and why?
When we interchange the DC armature connection to reverse the motor direction, the rotor turns against the rotating stator field. This is because reversing the armature connection effectively changes the direction of the magnetic field produced by the rotor. As a result, the rotor's magnetic field opposes the stator's rotating magnetic field, causing the rotor to turn in the opposite direction.
What is squirrel cage in motors?
When the number of rotor and stator poles are equal in the motor and if these rotor poles have opposite polarity with respect to the stator poles magnetic locking occurs. This magnetic locking is know as "Cogging" in 3 phase squirrel cage induction motor. In order to avoid this problem, the rotor slots housing the conductors are skewed by an angle of 5 degrees over the surface.
Can you change the direction on an ac motor?
A series DC motor can be thought of as having two components, the rotor and the stator. The rotor has windings which rotate and the stator's windings stay stationary. In a series DC motor these windings are connected in series. To make the motor turn backwards you must reverse the current through either the rotor or stator windings, but not both.
Why friction and windage loss for an induction motor remain constant with change of stator voltage?
Because the RPM remains same
What happen if fan not run in squirrel cage induction motor?
The fan mounted on the shaft is for cooling of the stator and rotor. If the fan stops the motor gets overheated and burns out.
What type of motor has a stator?
An electric motor has a stator and a rotor. The stator does not move. The rotor rotates inside the stator.
When the screwdriver motor changes direction?
The magnet is the stator part of the motor,either as a permanent or an electromagnet.It doldrums the rotor past of the motor towards it causing the rotation.
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 Synchronous motor work with principal?
A synchronous motor comprises of a stator windings and a rotor with a squirrel cage and inside that is windings(coils). At starting, this motor is an induction motor running with slip. After the rotor has reached a certain speed, a DC current is applied to the windings inside the squirrel cage. A fixed field is induced in these windings. This field locks in with the synchronous rotating magnetic flux of the stator windings. The rotating stator windings then pull the rotor along. The amount of excitation current can be used to control the power factor of the motor, making this a popular type of motor for high power use with a constant mechanical load.
Is the rotor turning with or against the rotating stator field when we interchange the DC armature connection in order to reverse the motor direction and why?
When we interchange the DC armature connection to reverse the motor direction, the rotor turns against the rotating stator field. This is because reversing the armature connection effectively changes the direction of the magnetic field produced by the rotor. As a result, the rotor's magnetic field opposes the stator's rotating magnetic field, causing the rotor to turn in the opposite direction.
In induction motor the will the direction of the rotor will be in the direction of the current?
The direction an induction motor will turn depends upon the direction of the rotating field setup by the winding. Remember in AC the direction of the current reverses itself 120 times every second for a 60 hz system. So no it will not turn in the "direction" of the current.
What is the principle of operation of universal motor?
Similar to DC permanent magnet motor (which I'm assuming you understand); except the stator is not a permanent magnet but an electromagnet. There are 2 separate coils on the stator, which are connected in series with the brushes and armature: supply ----- stator segment --- brush - armature - brush --- stator segment ----- return Since the stator coil segments are wired in series with the armature, reversing the supply will *not* change the direction of rotation; as both magnetic fields will reverse together. (But a reversing switch affecting only the armature *will* reverse the rotation.) And since the motor will always turn in the same direction independent of the supply polarity, this means it will work equally well from DC or AC; and the supply frequency will not affect the rotation speed.
What is generator slip?
Most electrical machines are induction machines, e.g. the motor of vacuum cleaners and refrigerators. The spinning metallic rotor is not connected to the outside mains electrical cables. It has a structure (called a squirrel-cage, since it resembles a cylindrical cage for a small animal) within which electrical currents are induced from the coils of the outside stator, which are connected to the mains supply. As a motor, the squirrel-cage rotor electrical currents oscillate at a slightly slower rate those in the stator, consequently the rotor is 'dragged around', so giving the motor action. However, if the rotating shaft of the same device is forced round faster than the changes in the stator, the machine becomes a generator of electricity. The relative change in speed between the electrical currents in the stator and rotor is called the SLIP; positive for generating action and negative for motor action.
What is squirrel cage in motors?
When the number of rotor and stator poles are equal in the motor and if these rotor poles have opposite polarity with respect to the stator poles magnetic locking occurs. This magnetic locking is know as "Cogging" in 3 phase squirrel cage induction motor. In order to avoid this problem, the rotor slots housing the conductors are skewed by an angle of 5 degrees over the surface.
Difference between squirrel cage and wound rotor induction motor?
Both have 3 a phase stator winding, the squirrel cage has a rotor with bars arranged around it's periphery, these bars are joined at both ends by a continuous ring. This forms a closed circuit of low resistance which is fixed. The wound rotor (slip ring motor) is similar in construction but the bars are replaced by copper windings, similar to those in the stator. They are star connected and the three ends are brought out to slip rings which allow an electrical connection to be made to the outside world. When no connection is made between these ends and the stator is energised, little current flows in the stator which does not turn, but when some resistance is inserted, current flows in the stator windings and the rotor rotates. As the rotor gains speed the resistance is taken out of circuit and the slip rings shorted together. The motor runs as a cage induction motor.
Can you change the direction on an ac motor?
A series DC motor can be thought of as having two components, the rotor and the stator. The rotor has windings which rotate and the stator's windings stay stationary. In a series DC motor these windings are connected in series. To make the motor turn backwards you must reverse the current through either the rotor or stator windings, but not both.
