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.
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 Greaves.
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.
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
⇒ 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.
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.
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 mechanical power.
The benefits of using these motors are maximum in continuous duty applications like Blowers, Compressors, Fans, Exhausters Pumps etc.
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 loads.
⇒ 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
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.
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 .