Energy Efficient Motors Specialty & Its Constructional Improvement
- As stated earlier, the energy efficient motor is that motor which operates giving efficiencies (2 to 4 % more than other standard motors), operates at reasonably good power factor and loss of power is lesser.
- These are manufactured with the change in design of slot shapes.
Specialty of Motor and its Constructional Improvement
- Energy Efficient Motors (EEM) are the ones in which, design improvements are incorporated specifically to increase operating efficiency over motors of standard design.
- Design improvements focus on reducing intrinsic motor losses.
- Improvements include the use of lower-loss silicon steel, a longer core, thicker wire, thinner laminations, smaller air gap between stator and rotor, copper instead of aluminium bars in the rotor, superior bearings and a smaller fan, etc.
- Energy efficient motors now available in India operate with efficiencies that are typically 3 to 4 percentage points higher than standard motors.
- In keeping with the stipulations of the BIS, energy-efficient motors are designed to operate without loss in efficiency at loads between 75 % and 100 % of rated capacity. This may result in major benefits in varying load applications.
- The power factor is about the same or may be higher than for standard motors.