Table of Contents
Why are coils laminated?
The core is laminated to reduce these to a minimum as they interfere with the efficient transfer of energy from the primary coil to the secondary one. The eddy currents cause energy to be lost from the transformer as they heat up the core – meaning that electrical energy is being wasted as unwanted heat energy.
What is stator lamination?
ABSTRACT. Thin metal laminations are used to minimize the eddy current loss in the stator cores of high-speed, high-performance induction motors.
Why do we use lamination?
Lamination increases the durability of print materials, allowing them to withstand frequent use. Lamination adds protection against fingerprints and smudges, stains and spills, tears and wrinkles, marks and abrasions, plus oil, grease, dirt, moisture and other contaminants.
Why is armature core laminated instead of solid?
Eddy current losses are directly proportional to area of armature or more precisely the path of motion. In laminated armature eddy current losses are reduced to very less or ‘0’ quantity. That is why armature of DC machines (either motor or generator) is laminated.
Why transformer is laminated?
The iron core of a transformer is laminated with the thin sheet; the laminated iron core prevents the formation of eddy currents across the core and thus reduces the loss of energy.
Is the stator laminated?
A typical stator core is made up of countless individual steel laminations – from thousands up to even hundreds of thousands. As of now, laminations are created by computer-controlled laser cutting machines or stamping/punching dies.
What are the disadvantages of lamination?
Disadvantages of Using Laminates
- Laminates are difficult to recycle.
- If the top layer get worn then whole laminate sheet has to replaced.
- If laminate sheets are used for flooring, then it’s create very slippery surface.
- Laminates are brittle hence they are prone to clipping.
- Laminates are difficult to bend.
Is laminate a plastic?
Contrary to popular belief, laminate flooring is not made out of plastic. Now, due to innovative manufacturing, laminate looks as if it is solid hardwood or stone, but is much more affordable.
Why are some part of a DC machine laminated?
It is laminated to reduce the eddy current losses. In a DC machine, open slots are use to reduce leakage flux, inductance, and leakage reluctance.
What happens when a stator is laminated?
By laminating the stator, you reduce the eddy current and the heat it generates. Cooling the core simplifies down to pumping air or hydrogen across the core structure. The electromagnetic field created by the rotating stator magnetizes the iron core. However, these effects don’t happen at the same time.
What would happen if the stator core were made of solid steel?
Conversely, as the magnetic field of our energized rotor passes through our stator core, it creates a perpendicular flow of current through the stator. If our stator core were made from one solid piece of steel, these currents (known as circulating currents or eddy currents) and the associated heat generated would be huge.
What is the effect of eddy current on a stator core?
As a result, the reduced eddy current will mean that the stator core is able to keep its constant power and operate efficiently. Other than producing eddy currents, the electromagnetic field also magnetizes the stator core, also known about as hysteresis.
How do you cool a stator core?
Hence, allowing the heat generated by the currents to be managed by pumping cooling gases (hydrogen or air) through and/or across the stator core structure. Simply put, this makes sure that the stator core’s performance is not compromised or even driven to the point of terminal malfunction.