Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)

Ask More Info Of  A Seminar Ask More Info Of A Project Post Reply  Follow us on Twitter
07-12-2012, 02:05 PM
Post: #1


.ppt  ELECTRIC DRIVES.ppt (Size: 1.25 MB / Downloads: 192)

Electrical Drives

About 50% of electrical energy used for drives
Can be either used for fixed speed or variable speed
MEP 1523 will be covering variable speed drives

Components in electric drives

Control unit

Complexity depends on performance requirement
analog- noisy, inflexible, ideally has infinite bandwidth.
digital – immune to noise, configurable, bandwidth is smaller than the analog controller’s
DSP/microprocessor – flexible, lower bandwidth - DSPs perform faster operation than microprocessors (multiplication in single cycle), can perform complex estimations
Electrical isolation between control circuit and power circuit is needed:
Malfuction in power circuit may damage control circuit
Safety for the operator
Avoid conduction of harmonic to control circuit


Sensors (voltage, current, speed or torque) is normally required for closed-loop operation or protection
Electrical isolation between sensors and control circuit is needed for the reasons previously explained
The term ‘sensorless drives’ is normally referred to the drive system where the speed is estimated rather than measured.

Overview of AC and DC drives

AC motors used in high performance applications – elevators, tractions, servos
AC motors favorable than DC motors – however control is complex hence expensive
Cost of microprocessor/semiconductors decreasing –predicted 30 years ago AC motors would take over DC motors

Elementary principles of mechanics

As the motor speed increases, the kinetic energy also increases. During deceleration, the dynamic torque changes its sign and thus helps motor to maintain the speed. This energy is extracted from the stored kinetic energy:

Thermal considerations

Electrical machines can be overloaded as long their temperature does not exceed the temperature limit
Accurate prediction of temperature distribution in machines is complex – hetrogeneous materials, complex geometrical shapes
28-07-2016, 09:18 PM
Post: #2
29-07-2016, 12:03 PM
Post: #3
Electrical drives have become the most essential equipment now days in the electrical motors and other rotating machines. We know that electrical drives mainly accomplishes three kinds of work,


Speed control


It can be said that the electrical drives enable us to control the motor in every aspect. But control of electrical drives is also necessary because all the functions accomplished by the drives are mainly transient operations i.e the change in terminal voltage, current, etc are huge which may damage the motor temporarily or permanently. That’s why the need of controlling the drives rises and there are various methods and equipment's to control different parameters of the drives which are discussed later.

Closed Loop Control of Drives

In a control system, there are two types of systems, one is open loop and the other is closed loop control system. In open loop control system the output has no effect on the input, i.e the controlling phenomenon is independent of the output, on the other hand closed loop control system is much more advanced and scientific, here the output is fed back to the input terminal which determines the amount of input to the system, for example if the output is more than predetermined value the input is reduced and vice-versa. In electrical drives feedback loops or closed loop control satisfy the following requirements.


Enhancement of speed of response

To improve steady –state accuracy

In the following discussions, we will see through different closed loop configurations which are used in electrical drives irrespective of the type of supply they are fed, i.e DC or AC.
Current Limit Control

During the starting, we know if precautionary measures are not taken there is a chance of huge current flow through the motor circuit. To limit the current and sense the current fed to the motor, current limit controller is installed. The feedback loop does not effect the normal operation of the drive but if the current exceeds the predetermined safe limit, the feedback loop activates and the current is brought down below the safe limit. Once the current is brought down below the safe limit the feedback loop again deactivates and in this way the control of current takes place.
Share INTRODUCTION TO ELECTRIC DRIVES PPT To Your Friends :- Seminar Topics Bookmark
Post Reply 

Marked Categories : ppt on electrical drives, ppts of electrical drives, electrical drives ppt, recent electric drives ppt abstract, ppt on electrical drive, electric drive ppt, introduction on electric drive ppt, abstract of electric drives and control in ppt, what is an electric drive ppt, electrical drives, seminar electrical drives ppt, electric drives and control ppt, introduction to ac drives ppt, electric drives introduction ppt, introduction to electric drives ppt, electrcal drives ppt, introduction to electrical drives ppt, electric drives, drives ppt, electric drives ppt, electrical drives ppts, electric drives introduction, download introduction to electric drives ppt,

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Hybrid Electric Vehicle mkaasees 0 0 09-11-2016 03:41 PM
Last Post: mkaasees
  ELECTRIC TRACTION ppt seminar ideas 2 8,085 11-10-2016 04:50 PM
Last Post: jaseela123
  THIN FILM TRANSISTOR PPT study tips 1 1,322 05-09-2016 05:54 PM
Last Post: computer science crazy
  ppt on Transformer seminar flower 4 4,554 18-07-2016 03:43 PM
Last Post: jaseela123
  Recent trends in power generation and transmission ppt study tips 2 2,840 25-04-2016 11:47 AM
Last Post: mkaasees
  RENEWABLE ELECTRIC ENERGY SOURCES seminar class 3 160,516 11-04-2016 09:39 AM
Last Post: mkaasees
  Mobile CHARGING BY HEARTBEAT PPT project girl 11 4,771 28-01-2016 11:25 AM
Last Post: mkaasees
  Energy Saving and Advanced Hybrid, Battery Electric, and Fuel Cell Vehicles dhanabhagya 0 359 02-01-2016 12:52 PM
Last Post: dhanabhagya
  Biomedical Signal Processing PPT study tips 2 1,753 30-12-2015 10:00 AM
Last Post: mkaasees
  Electrical Transients in Power System ppt project girl 1 3,212 27-10-2015 02:11 PM
Last Post: Guest
This Page May Contain What is INTRODUCTION TO ELECTRIC DRIVES PPT And Latest Information/News About INTRODUCTION TO ELECTRIC DRIVES PPT,If Not ...Use Search to get more info about INTRODUCTION TO ELECTRIC DRIVES PPT Or Ask Here