ENERGY EFFICIENT MOTORS

1. ENERGY EFFICIENT MOTORS Submitted by: Nishchal Sharma EEE 0581324907

2. What’s The Need ??? • Energy crisis in the world will be one of the factors to impede the economic growth of both developing and developed countries. • If new oil and gas reserves are not found, the whole country with a high population growth will have serious problem. • The alternative solution to this energy crisis is to optimize the use of available non-renewable energy or to device efficient machines running on renewable energy.

3. Losses in a Machine • winding losses • Iron losses 1. Eddy current losses 2. Hysteresis losses • Friction losses • Windage losses

4. Energy efficient machinescan be designed by….. • By redesigning the basic machine structure • By selection of energy efficient core and winding materials • By interfacing the machine with external devices

5. Induction Motors • Due to easy construction, cheapness, high efficiency, ruggedness induction motors are widely used. • Long operating life and almost zero maintenanceare added advantages. • Almost 95% of the motors used in house hold appliances, industries and commercial enterprises employ induction motors.

6. Energy Efficient Core Material • Normally core loss in a machine is around 30~ 50% of the total losses and about 3% of the machine rating. • Using core material having high permeability and low loss. 1.Electrical steel of grades 8050, 8050H, 5350,5350H 2.Using die cast copper cage • Die cast copper rotor reduced total energy losses by 15~23%.

7. Synchronous machines using superconducters • Efficiency improvements near 1% • Decreased size and weight for equivalent ratings • Ability to manufacture larger size generators than is possible with conventional technology • Improved steady state and transient system performance • Reduced life-cycle costs

8. Efficiency Optimization using the Skin Effect • The skin effect may be utilized to optimize the performance of squirrel cage induction motors. • Double cage rotors are used to increase rotor resistance at start up. • An outer cage of high resistance material such as brass and inner cage of low resistance such as copper. • Outer cage limits the starting current.

10. Benefit Comparison

11. Conclusions • Using of improved magnetic materials • Replacement of Aluminum cage with Copper cage • Design of permanent magnet machines. • Utilizing skin effect for efficiency • Use of superconducting materials in the machine

12. THANK YOU