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What is the angle between magnetic fields on a three phase motor?
Wiki User
∙ 13y ago
You have to sort of visualize the composite EM Field from the 3 phases. The 3 phases are offset 120 degrees from each other. Imagine 3 electromagnets in a straight line. Each magnet is connected to one of the phases. If the first one to the left is at peak (max magnetic field is over it), the other 2 are at less than peak, but the current in the left magnet is falling while the current in the center and right are building. The right is farther behind===> Center reaches peak first (Now the peak magnetic field is over the center). But the center current is falling while the right continues to build to peak. Now the peak magnetic field is over the right and the left has been building again ===> The magnetic field moves over the left again and the cycle repeats.
Now bend those 3 magnets into a circle ===> rotating field.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoIt depends on how many poles there are.
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Why current will reduces after motor runs in constant?
Because the slip angle between magnetic fields decreases as the rotor comes up to speed.
What are magnetic shading coils and what do they do in a magnetic motor Starter?
Shading coils provide a phase shift between the magnetic field of the rotor and stator, which is necessary to get the motor spinning.
Importance of reactive power?
So as to start the motor because reactive power helps create the magnetic fields in rotor.
Which principle is used in a DC motor?
Current carrying conductor kept in a magnetic field gets deflected. This is the basic principle. In short Lorentz force causes the rotation
Why use capictor in motor?
To create rotating magnetic field inside motor stator and it is done by capacitor. current drawn by motor running winding is lagging in nature when capacitor is connected in series with starting winding then the phase angle of running winding current and starting winding currents changes which creates a rotating magnetic field and motor is able to run.
Why current will reduces after motor runs in constant?
Because the slip angle between magnetic fields decreases as the rotor comes up to speed.
The operation of an electric motor depends on?
Controlled movement of magnetic fields.
Does induction motor has rotor winding?
Yes, the induction motor has a rotor winding. It is usually one turn, shorted. This is how the magnetic fields generated in the stator induce a current in the rotor, which subsequently generates a torque from the opposing magnetic fields, stator to rotor.
What are magnetic shading coils and what do they do in a magnetic motor Starter?
Shading coils provide a phase shift between the magnetic field of the rotor and stator, which is necessary to get the motor spinning.
Difference between a magnetic treadmill and a motor treadmill?
$ 200.00
A device that can induce alternating voltage using armatures forced to spin in strong magnetic fields is the?
This is an AC induction motor.
Importance of reactive power?
So as to start the motor because reactive power helps create the magnetic fields in rotor.
How is electricity used to move a car?
Electricity can create magnetic fields. A magnetic field will attract or repel another magnetic field. That principle is used in the manufacture of electric motors. Magnetic fields are created in both an armature and an outside winding. When the magnetic fields are opposite, the armature tries to turn so that it is in line with the outside winding. Then the magnetic field changes polarity and the armature continues in the same direction, pushing the magnetic fields away. The process continues, repeatedly and quite rapidly to make an electric motor armature turn. The armature can be connected to a drive shaft or even directly to a wheel to make the vehicle move.
How does an induction motor develop torque?
The shaft of an AC induction motor rotates because of the torque created by the interaction between the magnetic field of the stator and the magnetic field of the rotor.
What is a step angle?
The nominal angle through which the step motor shaft rotates between adjacent step positions.
Which principle is used in a DC motor?
Current carrying conductor kept in a magnetic field gets deflected. This is the basic principle. In short Lorentz force causes the rotation
Why the induction motor power factor is poor at no laod?
If the power demand is lower than that, you still have to setup the magnetic fields as if you were going to supply that maximum power
