Crompton Greaves has now developed a complete family of high
efficiency motors confirming to Eff level 1 standards of IEEMA : 19-2000
and other applicable standards in Europe and rest of the world.
These motors are available in TEFC construction for use in safe areas
and also in flameproof enclosure for use in Hazardous areas.
SPECIAL DESIGN FEATURES :
Higher efficiencies are achieved by following special features :
• Low loss special grade of thinner laminations. This reduces the Iron
loss even at partial loads.
• Thicker conductors and more copper contents reduce copper loss
due to lower resistance.
• Longer core length, reduced and uniform air gap between stator
and rotor to reduce stray losses .
• Special design of fan and fan cover to reduce windage losses.
Improved efficiency is available from 60 % to 100 % load. The eff curve
is almost flat resulting in higher energy savings as in most of the cases
the motor is not always fully loaded .
The special design features also result in lower operating temperatures
which enhance the life of motor and reduce the maintenance costs.
These motors have inherently low noise and vibration and help in
conservation of environment .
Crompton Greaves energy efficient motors offer an additional feature
which no other manufacturer offers.
These motors are with highest power factor in the industry due the
special exclusive designs available with Crompton
The higher power factor reduces the currents in the cables supplying
power to motor and this reduces cable loss, improving the system
efficiency sometimes by even 2 %.
Sometimes this allows even a lower cable size saving tremendously on
capital costs. Saving is also made by reducing capacitors required to
improve power factor.
MANUFACTURING RANGE :
Efficiency Level 1
• 0.37 kW to 160 kW
• Frame sizes : 71 to 315 for TEFC
80 to 315 for Flame proof
• The entire range is available in IEC frames sizes (metric
range) and also in NEMA frames
CONFORM TO FOLLOWING STANDARDS : • IEEMA : 19-2000
• IS 12615
• IS 325-1996 & IEC 60034
• NEMA EPACT EFFICIENCY VALUES (for NEMA motors)
IEEMA 19-2000 standard covers kW ratings only up to 160kW. However
we are offering energy efficient motors up to 450 kW.
IMPORTANCE OF ENERGY EFFICIENCY :
Growing cost of energy calls for power saving at each possible step of
manufacturing. Electric motor driven systems used in industrial
processes consume more than 70 percent of electricity used in industry,
hence best possible technology is being applied for achieving highest
possible efficiency values.
EFFICIENCY MEASUREMENT OF AN ELECTRIC MOTOR
The efficiency of an electric motor is determined by the amount of useful
power it produces compared to the amount of energy required to
operate it. The figure below illustrates how a Crompton Greaves Energy
efficient motor effectively turns 1000 units of electrical power into
Since motor efficiency is commonly expressed as a percentage.
Efficiency in this case would be 94%.
ENERGY EFFICIENT MOTORS LEVEL 1
The benefits of using these motors are maximum in continuous duty
applications like Blowers, Compressors, Fans, Exhausters Pumps etc.
BEST PERFORMANCE EVEN AT PARTIAL LOADS :
In many applications the load factor of the motor will range between
60% to 80%. The efficiency curve of standard motor is drooping in
nature i.e there is a sharp fall in efficiency at partial loads. But the
energy efficient motors have a flat efficiency curve and hence the fall in
efficiency is marginal. Thus energy saving is significant even in part
INTERNATIONAL APPROVALS CERTIFICATES
ASSESSING COST EFFECTIVENESS OF ENERGY EFFICIENT
Savings are calculated as follows :-
kW - out put of motor in kW
E1 - efficiency of standard motor
E2 - efficiency of energy efficient motor
3.7 kW 4 pole motor in frame ND112M
Std motor eff 2: 85 % eff1 88.3 %
Price eff2 : Rs 7215/- eff1: Rs 9380/-
Working hours 16 per day, working days 300 in a year,
power rate Rs 4.50 per kWH
X = 0.1626
RS Savings = 0.1626X16X300X4.5
= 3514 /- RS per year
Extra investment RS 2615/-
Payback period = 9 months
Energy cost for a 15 years usage at Rs 4.50 / kWH is staggering 14.10
lacs as compared to buying cost of Rs 7215/-. Also the energy kWH rate
is likely to only go up in future.
If we compare initial purchase price of the motor with the cost of energy
it uses over it working lifetime, the initial cost represents less than two
percent of its lifetime cost in most of the cases .
So it makes a great deal of sense to choose an eff1 level motor
whenever a motor is needed to drive any applications.
Combining this with usual Crompton greaves motors reliability, wide
service network (over 180 service points all over India), the wise choice
is Crompton greaves EFF1 motor.