Mission Malfunction…!

sometimes i found happiness thinking of my redrawn strategies and changed gears!
Suddenly i will get involved in Holmsian thinking of philosophy(I used to call it so…Don’t care if othr ppl think something else…!!)all these happen just after getting my semester results..
What happened to me…?
What came over my typical brain which stood sensible during my intermediate ,3 years ago!
The ecstasy i have felt after excelling beyond my expectations ! I never knew then that it might be my swan song.!
As my performance in engineering is always far below my caliber!
Some turbulence which i had experienced during my 2-2 semester exams suddenly flashed before my eye balls.!
To be frank i’m at my wits end ..
In a desperate situation to strike back under any circumstances i have to strike back….
Get back to 70+
Tossing and turning emotions But all i knew that is i had to hold on…!
The support i’ve got from my fewest pals could be a good reason for my striking back.
Ofcourse for other ppl its nothing(71.2) But for me its something considerable thing of my life.!
I got that when i was a textaholic….
Atleast 400 sms’s daily i used to forward …
Every damn thing i received i used to forward.!
But there is some regular chat with two people whom i consider somewhat closer than others ..!
Its good to share experiences of studying ..
Hey I have selected these chapters what u gonna do chap….
can we find those chapters in that book..?
Was that book good enough..?
How many chapters u were going through..?
Ofcourse that was a silly thing…
But it builds some confidence..
Thanks to those two.!
But now every one had stopped texting…
even i had recovered from my textaholic state…!!
Only one who still text is Kittu only…
He remained same since 1st yr…!!
I have chosen this trade only to satisfy me endless love for machines..Still i’m infinite far from getting what i deserved..I have had the count of things that i dint had…
I was very impeccable at planning of course every one do..
and i was insane enough to fail at execution.!
And now there are no people to share them tooo.. 😦

Some times i feel like shouting ” A hell hound is outta thr to give u ppl a great hell..”
But the same thing of failing at execution scares me like anything….!
All i hope is that my life is busy in preparing something extra normal and large for me..
I ended up inn writing the same sentence as i always do…
“LET THE DESTINY TO PLAY ITS BELATED ROLE”
And there is something hot on the board for this summer….
” Some one is about to get caught in a tarantula’s web called Love..
He may get sucked outta his life again….
Increased instances of pirated emotions made me to think so…””

Lets see what this summer got for me
A Huge Gift box or The Same Size Pandora’s Box…!!!
And i have started another mission for 3-2 exams…
i.e Mission Malfunction…!!

MAGNETIC BEARING TECHNOLOGY

Magnetic bearings have been utilized by a variety of industries for over a decade with benefits that include non-contact rotor support, no lubrication and no friction.

Conventional mechanical bearings, the kind that physically interface with the shaft and require some form of lubrication, can be replaced by a technology that suspends a rotor in a magnetic field, which eliminates friction losses.

There are two types of magnetic bearing technologies in use today – passive and active.  Passive bearings are similar to mechanical bearings in that no active control is necessary for operation. In active systems, non-contact position sensors continually monitor shaft position and feed this information to a control system.  This in turn, based on the response commanded by the system, flows to the actuator via current amplifiers.  These currents are converted to magnetic forces by the actuator and act on the rotor to adjust position and provide damping.

Additional benefits of magnetic bearings include:

• No friction
• No lubrication
• No oil contamination
• Low energy consumption
• Capacity to operate within a wide temperature range
• No need for pumps, seals, filters, piping, coolers or tanks
• Environmentally friendly workplace
• Impressive cost savings

In practice, these attractions are balanced in order to maintain a gap between the shaft (rotor) and static parts (stator). The function of the magnetic bearing is to locate the shaft’s rotation axis in the center, reacting to any load variation (external disturbance forces),

Floating rotors could boost compressor efficiencies

Traditional centrifugal compressors are based on low-speed drives, mechanical gears and oil-film bearings, resulting in high running costs because of their high losses, wear, and need for maintenance.

This new compressor drive (above) uses a permanent magnet motor, operating at an efficiency of around 97%, to drive a rotor “floating” on magnetic bearings, which spins the compressor impeller at speeds of around 60,000 rpm. These drives experience almost no friction or wear, and need little maintenance. They also minimize the risk of oil contamination, and result in compressors that are about half the size of traditional designs.

How they work

 

Magnetic bearings are basically a system of bearings which provide non-contact operation, virtually eliminating friction from rotating mechanical systems. Magnetic bearing systems have several components. The mechanical components consist of the electromagnets, position sensors and the rotor. The electronics consist of a set of power amplifiers that supply current to electromagnets. A controller works with the position sensors which provide feedback to control the position of the rotor within the gap.

The position sensor registers a change in position of the shaft (rotor). This change in position is communicated back to the processor where the signal is processed and the controller decides what the necessary response should be, then initiates a response to the amplifier. This response should then increase the magnetic force in the corresponding electromagnet in order to bring the shaft back to center. In a typical system, the radial clearance can range from 0.5 to 1 mm.

This process repeats itself over and over again. For most applications, the sample rate is 10,000 times per second, or 10 kHz. The sample rate is high because the loop is inherently unstable. As the rotor gets closer to the magnet, the force increases. The system needs to continuously adjust the magnetic strength coming from the electromagnets in order to hold the rotor in the desired position.