Table of Contents
- 1 How are eddy current reduced?
- 2 How are eddy currents produced in metallic core?
- 3 How are Eddy currents Minimised Class 12?
- 4 How are eddy currents produced?
- 5 How are eddy currents used in induction furnace?
- 6 How do DC machines reduce losses?
- 7 What is eddy current loss in magnetic materials?
- 8 Why does a thinner core reduce the eddy current?
How are eddy current reduced?
Eddy current magnitude can be reduced by designing the core as a set of thin sheets or laminations, in parallel to the magnetic field. Eddy currents can also be reduced by using a magnetic material such as silicon steel, with a higher resistivity.
How are eddy currents produced in metallic core?
Eddy currents is produced in any metallic conductor when magnetic flux is changed around it.
How do you reduce the eddy current in the core of a transformer?
We can reduce eddy currents in the core of transformer
- A. by increasing the number of turns in secondary coil.
- B. by taking laminated core.
- C. by making step-down transformer.
- D. by using a weak ac at high potential.
- Answer. B.
How does DC machine reduce eddy current loss?
To reduce eddy-currents, the armature and field cores are constructed from laminated (layered) steel sheets. The laminated sheets are insulated from one another so that current cannot flow from one sheet to the other.
How are Eddy currents Minimised Class 12?
(A) Using a laminated iron core. (B) Moving the conductor rapidly. Hence laminating a core can reduce the currents. …
How are eddy currents produced?
They can be created when a conductor is moving through a magnetic field, or when the magnetic field surrounding a stationary conductor is varying i.e. anything which results in the conductor experiencing a change in the intensity or direction of a magnetic field can produce eddy currents.
What are eddy currents how are they produced give two applications of eddy currents and how can they be minimized?
2. Induction Motor : The eddy currents may be used to rotate the rotor. Its principle is : When a metallic cylinder (or rotor) is placed in a rotating magnetic field, eddy currents are produced in it. According to Lenz’s law, these currents tend to reduce to relative motion between the cylinder and the field.
What is eddy current loss in transformer?
These induced currents do no useful work and are known as eddy currents. Eddy current loss in the transformer is basically I2R loss present in the core due to the production of eddy current in the core. Eddy current losses are directly proportional to the conductivity of core.
How are eddy currents used in induction furnace?
In the induction furnace, a coil carrying alternating electric current surrounds the container or chamber of metal. Eddy currents are induced in the metal (charge), the circulation of these currents producing extremely high temperatures for melting the metals and for making alloys of exact composition.
How do DC machines reduce losses?
The losses can be reduced by reducing the field current. Ifso, the armature current should be increased to keep the required torque. 1) The adaptive sub-controller repeatedly adjusts the field current until there is a minimum power input.
How can the mechanical losses be reduced?
Mechanical friction losses are being reduced by converting sliding metal contacts to rolling contacts, reducing the weight of moving parts, reducing production tolerances to improve the fit between pistons and bore, and improving the lubrication between sliding or rolling parts.
How can eddy currents be Minimised Mcq?
EXPLANATION: The eddy current loss can be reduced by increasing the resistance of the core.
What is eddy current loss in magnetic materials?
Since the magnetic material (magnetic core) is completely closed an electric current start flowing in the material. This current is known as Eddy current. To reduce the Eddy current loss we use lamination of thin plate. Thin plate results in lower cross sectional area which increase the core resistance and hence Eddy current reduce.
Why does a thinner core reduce the eddy current?
However if the cross section of the metal is less then there won’t be enough of the metal to form a loop of current in it ( eddy current) or at least the number will be reduced by a lot , decreasing the eddy currents. So a thinner core will ensure that there are lower Eddy currents are formed due to a simple reason.
How to reduce eddy current loss in Transformers?
In order to reduce the eddy current loss, the resistance of the core should be increased. In other words, low reluctance should be retained. In devices like transformers, the core is made up of laminations of iron. ie,the core is made up of thin sheets of steel, each lamination being insulated from others.
How can we reduce the eddy current loss of a microcontroller?
To reduce the Eddy current loss we use lamination of thin plate. Thin plate results in lower cross sectional area which increase the core resistance and hence Eddy current reduce. So when the v/f ratio is same then Eddy current losses only depend upon the frequency.