CapacitorsA capacitor is a device that stores electric

charge.A capacitor consists of two conductors

separated by an insulator.Capacitors have many applications:

Radios and electronic circuits.Fans , motor e.t.c.

There are 2 types of capacitor. Fixed capacitors with fixed capacitance

values and variable capacitors with variable (or adjustable) capacitance values.

A fixed capacitor is constructed in such manner that it possesses a fixed value of capacitance which cannot be adjusted. A fixed capacitor is classified according to the type of material used as its dielectric, such as paper, oil, mica, or electrolyte.

VARIABLE CAPACITORA variable capacitor is constructed in such

manner that its value of capacitance can be varied.

E.g tune a radioSymmetric diagram of capactor

Capacitors and Capacitance

Charge Q stored:

CVQ The stored charge Q is proportional to the potential difference V between the plates. The capacitance C is the constant of proportionality, measured in Farads.

Farad = Coulomb / Volt

A capacitor in a simpleelectric circuit.

ENERGY EFFICIENT MOTOR

Energy Efficiency Purpose

The purpose of energy efficient motors is to be able to supply the same level of energy service only using less energy.

Efficient energy use is achieved primarily by means of a more efficient technology or process rather than by changes in individual behavior.

Energy conservation reduces the energy consumption.

Efficiency

Definition of "efficiency".

For an electric motor, efficiency is the ratio of mechanical power delivered by the motor (output) to the electrical power supplied to the motor (input).

Efficiency = (Mechanical Power Output / Electrical Power Input) x 100%

Thus, a motor that is 85 percent efficient converts 85 percent of the electrical energy input into mechanical energy.

The remaining 15 percent of the electrical energy is dissipated as heat, evidenced by a rise in motor temperature.

Energy efficient electric motors utilize improved motor design and high quality materials to reduce motor losses, therefore improving motor efficiency.

Description of motor component’s losses

Copper loss:

Iron loss:

Friction and windage loss:

Cost of energy efficient motors: Usually it is of normal cost and slightly

more than the normal motors. It is about 15% to 30% more than the normal motors.

In Future, the initial cost may be available at the same cost as a standard motor when the population of EE Motors increases

Advantages

The EEM has a greater efficiency than a standard motor; therefore they have less operating costs.

EEM has a lower slip so they have a higher speed than standard motor.

EEM can reduce maintenance costs and improve operations in industry due to robustness and reliability.

Application

Energy efficient motors are specially suited for industries which are power intensive and equipments which run on constant load for long duration.

For example: fans, blowers, pumps, compressors etc. are some of the driven equipments and industries such as textile, paper, cement, power generation etc.

THANK YOU