Power Saving System For Lathe Machine – Mechanical Project

Power Saving System For Lathe Machine – Mechanical Project

In this modern world, the power saving system is help to us many purposes. Here
we are using an electronic A.C motor speed regulator. This regulator is used to maintain
the set speed of the motor constant.
The speed variation due to over load, line voltage fluctuations, over voltage, surge
problems etc. Can be controlled and the speed is maintained constant by using this
“POWER SAVING SYSTEM IN LATHE”. This unit can be used upto 1 H.P. A.C.


In most of the applications of A.C. motor constant speed is most suitable for many
applications. Speed varied due to overload, line voltage fluctuations in the input supply,
over voltage, changes in the frequency. Surge problems etc., Hence to overcome the
above electronics control unit are suggested. These problems may cause poor speed
regulation of the motor and also lesser efficiency. To avoid these problems electronic
this unit is used to maintain a constant speed of the motor.
Electronic Digital Speed control of A.C. Motor can be economically constructed
ensuring the automatic speed regulation irrespective of load conditions however being
essentially we can set the required constant speed with constant power. The motor speed
can be from zero to maximum rated speed. This unit can be used upto 1HP A.C. Motor.

For speed setting there is a regulating potentiometer with points for Indicating the setting we can select the required speed of the particular motor depends upon its purpose.


The control circuit is consisting of an error amplifier speed amplifier, a current amplifier, voltage controlled oscillator, a trigger circuit and a full wave bridge converter.

The A.C motor is powered by an A.C converter, depending upon the firing angle of the SCR. The current supplied by the SCR will be lagging with the applied voltage, so speed control can be achieve by the varying the firing angle of the SCR.

The speed and current amplifier provided with regulated constant D.C. voltage. When the speed is set to a value by means of potentiometer, the error amplifier gives a voltage. The output from the error amplifier is amplified by a speed amplifier; the output from the speed amplifier drives a current amplifier. The output of the current amplifier provides a D.C voltage to the oscillator circuit depending on the amplifier of the input voltage available at the VCO.

power saving in lathe Mechanical Project
power saving in lathe Mechanical Project


  • Industrial application
  • Machinery Application
  • Power Generation station
  • Power Transmission Station


  1. Speed control upto 1 H.P A.C motor
  2. Speed variation is smoothly.
  3. This circuit is a Closed loop control system
  4. In this circuit Isolation transformer is used so that the A.C motor is products
  5. SCR firing angle is varied automatically
  6. By slight modification of this circuit, the single phase induction motor speed also varied.


  • This circuit produce the sinusoidal A.C voltage only, not the pure A.C voltage
  • The noise produced by the motor is high due to voltage variation
  • The efficiency of the motor is decreased due to input voltage is varied by the SCR circuit.

Sachin Thorat

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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