This presentation is all about the control of Elevator. This presentation includes history of elevator, motors used in elevator and V/F control of it.

1. Electric Drives for Elevators
Presented By:
Prashant Kumar, B12072
Himanshu Rathore, B12075
Sakshama Ghoslya, B12122
Instructor: Dr. Bhakti Joshi, Assistant Professor, IIT Mandi

2. Electric Drives
A system which controls motion of electric machines

3. Introduction to Elevator
o Most common solution for vertical transport
oModern elevator: High transport speed, low jerk,
precise positioning, simple and efficient control
o Factors to improve: Control structures, safety
elements, drive endurance, durability and economy

4. History
 1850: Hydraulic and steam elevator
 1857: First passenger elevator installed
 1922: Gearless elevator in Chicago
 1975: Thyristor (SCR) DC Drives Control
Elevators, All Analog Components in the 70’s
1980’s – Microprocessors Improve

5. Types of Elevator
 Hydraulic Elevators
 Gear Traction Elevator
 Gear-less Traction Elevator
 Machine Room-less Elevator
 Climbing elevator
 Pneumatic Elevators
Pic courtesy: www.archtoolbox.com

6. Quadrant Operation

7. Modern Elevator
 Commutator type DC motors were used in earlier days
 Now a days 3-phase Induction motor with variable
frequency drives are used after development of high power
controlling devices

8. Elevators’ Motor Speed Control
 Stator voltage control
 Stator frequency control
 Rotor resistance control
 V/F control

9. V/F Control

10. V/F Control
Output of VSI fed to Induction motor
Pic Courtesy: www.electrical4u.com

11. V/F Control
 Speed is accurate
 simple control scheme
 Constant speed even at varying load

12. Thanks