And scheduling; electric motor systems management software; and the U.S. Department of Energy's Motor Challenge Program (now the Best Practices program). Results 1 - 30 of 332 - Discover Book Depository's huge selection of Electric Motors Books online. Free delivery worldwide. We use cookies to give you the best possible experience. By using our. Manual of Repairing & Reconditioning Starter Motors and Alternators. Practical Variable Speed Drives and Power Electronics.
Electric motors are intrinsically very efficient. Their efficiencies vary from 85% to 95% for motors of sizes ranging from 10 HP to 500 HP. It is still possible to improv e the efficiency of these motors by 1 to 4% by using more efficient motors. However, in the energy efficiency game, there are a number of other things also one should focus; m ore than just improving the efficiency of motors alone.
This guide will discuss mainly the energy efficiency related issues in selection and application of three phase squirrel cage induction motors. They are very reliable, rugged and cover more than 90% of the installed capacity of electric motors in the industrial sector. All India market for electric motors is summarised in Table 1.1.
It can be seen that squirrel cage LT motors account for about 75% of total motor market in terms of kW. Table 1-1: Estimation of All India Market For Electric Motors (Year 2002-03) (Based on kW) LT – Low Tension, HT- High Tension, SCR- squirrel cage rotor, FLP – Flame proof, SR- Slip Ring The following figure 1.1 shows the break up of electricity use in motor driven systems in India.
Read Microsoft Word - BEST PRACTICE MANUAL-ELECTRIC MOTORS.doc text version BEST PRACTICE MANUAL ELECTRIC MOTORS Prepared for Bureau of Energy Efficiency, (under Ministry of Power, Government of India) nd Hall no.4, 2 Floor, NBCC Tower, Bhikaji Cama Place, New Delhi 110066. Indian Renewable Energy Development Agency, Core 4A, East Court, st 1 Floor, India Habitat Centre, Lodhi Road, New Delhi 110003 By Devki Energy Consultancy Pvt. Ltd., 405, Ivory Terrace, R.C. Dutt Road, Vadodara 390007, India. 2006 CO N TE NTS 1 1.1 1.2 2 INTRODUCTION.
3 BACKGROUND. 3 CLASSIFICATION OF MOTORS. 3 FUNDAMENTALS. 5 2.1 2.1.1 2.1.2 2.1.3 2.1.4 2.1.5 2.2 2.3 2.4 3 PRINCIPLE OF OPERATION. 5 Speed, Torque and Power.
6 Load Considerations. 6 Power Factor. 7 Efficiency. 9 Torque & Current /vs. Speed Characteristics of Motors. 10 MOTOR LOADING. 11 POWER LOSSES IN MOTORS.
11 EFFECT OF VOLTAGE UNBALANCE ON MOTOR PERFORMANCE. 12 SELECTION & EFFICIENT OPERATION OF MOTORS. 14 3.1 3.2 3.3 3.4 3.4.1 3.4.2 3.5 3.5.1 3.5.2 3.5.3 3.5.4 3.6 3.6.1 3.6.2 3.6.3 3.6.4 3.6.5 3.7 3.7.1 3.7.2 3.8 3.8.1 3.8.2 IMPORTANCE OF MOTOR RUNNING COST LIFE CYCLE COSTS. 14 MOTOR RATING SURVEY. 14 STOPPING IDLE/REDUNDANT RUNNING OF MOTOR DRIVEN EQUIPMENTS. 15 PROPER SIZING OF MOTORS. 16 Operation of Under-Loaded Delta-Connected Motors in Star Connection.
Electric Motor Repair Manual
17 Use of Electronic Soft Starters. 19 SELECTION & APPLICATION OF HIGH EFFICIENCY MOTORS. 20 Design.
20 Efficiency Standards. 20 A Note of Caution. 21 Estimation of energy saving.
21 M OTOR M AINTEN ANCE & R EWINDING. 22 Proper Lubrication. 22 Belts and Pulleys. 22 Bearings. 23 Rewinding. 23 Maintenance of Motors. 24 DRIVE TRANSMISSION.
24 Belt Drives. 24 Gear Drives. 25 APPLICATION OF ADJUSTABLE SPEED DRIVES.
26 Energy saving by use of ASDs. 26 Some Issues for Consideration When Using Electronic Ac Variable Speed Drives. 27 4 4.1 4.2 4.3 5 INTEGRATED SYSTEMS APPROACH. 29 PUMPING SYSTEMS. 29 COMPRESSED AIR. 30 REFRIGERATION & AIR-CONDITIONING.
31 CASE STUDIES. 34 5.1 5.1.1 5.2 5.2.1 5.2.2 5.3 5.3.1 5.3.2 5.3.3 5.4 5.4.1 5.4.2 5.5 5.5.1 5.5.2 SWITCHING OFF IDLE/REDUNDANT OPERATION OF MOTOR DRIVEN EQUIPMENT. 34 Case Study-1: Thermostat based operation of cooling tower fan. 34 MATCHING MOTOR WITH THE DRIVEN LOAD. 35 Case Study-2: Operation in STAR connection for under loaded motors. 35 Case Study-3: Use Of Electronic Soft Starters on Conveyors System.
36 USE OF HIGH EFFICIENCY MOTORS. 37 Case Study 4: Replacement of Inefficient Motor by High Efficiency Motor. 37 Case Study-5: Replacement of Inefficient, Oversized Motor with High Efficiency Motor. 37 Case Study-6: High efficiency motor in place of standard motors when replacing equipments.
38 IMPROVE DRIVE TRANSMISSION EFFICIENCY. 39 Case Study-7: Flat Belt in Place of V Belt in Air compressor. 39 Case Study-8: High efficiency planetary gears in place of worm gears.
40 IMPROVEMENT IN MOTOR DRIVEN SYSTEMS. 41 Case Study-9: Proper Sizing of Pumps. 41 Case Study-10: Use of variable frequency drive for a Cooling Tower Pump. 43 REFERENCES.