Energy Efficient Motors


Generally, the term energy efficient motor refers to maximizing the product of efficiency and power factor of a motor.

 

i.e. Max (efficiency X power factor)
 

 

High Performance Motors
 

This class of Energy Efficient motors has higher efficiency and higher performance values (speed, torque).

 

Motors with least energy consumption

Higher speed (rpm)                                                                     
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Most Suitable for Textile Industry
                                                                                                                         

High Performance motors are most suited to Textile Industry where motors are required not only to consume less energy but also, at the same time, give increased production.

 

Hence, High Performance motors have twin advantage:

Savings in power cost

More production* 

 

 

 

Indian Standard (IS 12615 : 1989)
For Energy Efficient Motors

 

 Rated Output(kW)

Speed at rated output (Min) (rpm)

Input current at Rated output (Max) (A)

Efficiency at 75% and 100% load (Min) (%)

Breakaway Torque  (as a percentage of full load torque) (Min)(%)

15

1440

28

89

180

18.5

1440

34

90

180

22

1440

40

90

180

30

1450

53

91

180

37

1450

65

91

180


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IEEMA Standard
for Energy Efficient Motors
 

This standard is prepared with “energy conservation” as the major requirement.

It follows the philosophy of categorizing motor efficiencies at three levels – i.e.

 Low efficiency           – (eff 3)

 Improved efficiency   – (eff 2)

 High efficiency          – (eff 1)
 

To conform to this standards and eligible to be considered as energy efficient, the motors shall meet the minimum norms of eff 2.
 

High performance motors should have efficiency conforming to eff 1.

IEEMA Standard – Performance Characteristics
 

 Rated Output (kW)

Full Load Speed  (Min) (rpm)

Full Load current (Max) (A)

Efficiency (equal or above) (%) eff 2, eff 1

Breakaway Torque in terms of full load torque (Min) (%)

22

 1440 43.0

90.5, 92.6

160

30

1450

 56.0

91.4, 93.2

160

37

 1450

69.0

92.0, 93.6

160

45

 1460

84.0

92.5, 93.9

160

55

 1460

99.0

93.0, 94.2

160


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 Savings using High Performance motor
  

Load

Motor type (40kw)

Effy (%)

Input Power (kW)
Unit in Lakhs/year (kWhr)

Annual Saving (Rs)

100%
EE

92.70

 43.15

3.668

Hi-Per

94.70

 42.24

3.590

EE

92.63

32.38

2.752

Hi-Per

94.18

31.85

2.707

EE

91.60

 21.83

1.856

Hi-Per

93.10

21.48

1.826

32,500

75%

18,921

50%

12,495

 


 Assumptions:

Power cost is assumed to be Rs 4.2 per unit

Motor utilization is assumed to be : 8500 hours per annum

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