How do I reduce the harmonics of my alternator?
Table of Contents
How do I reduce the harmonics of my alternator?
The different ways to eliminate the harmonics from generated voltage are,
- Distribution of armature windings : Instead of having concentrated type of windings, they should be distributed in different slots.
- Chording :
- Fractional slot windings:
- Skewing:
- Large length of air gap:
How harmonics are generated?
Harmonics are created by electronic equipment with nonlinear loads drawing in current in abrupt short pulses. The short pulses cause distorted current waveforms, which in turn cause harmonic currents to flow back into other parts of the power system.
What causes signal harmonics?
These unwanted signals are called Harmonics and Spurious signals. They are usually caused by the use of non-linear active devices like BJTs, FETs, MOSFETs, etc. Harmonics are a subset of Spurious signals found at integer multiples of the fundamental frequency of the signal.
What are slot harmonics?
The actual construction of the stator windings of alternating current rotating electric machines can give rise to the appearance of harmonic components in voltage known as “slot harmonics”.
Why harm harmonics are produced in alternators?
harmonics are produced in alternators because the the flux waveform is never perfectly sinusoidal. The effect of harmonics can be diminished by using short pitched coils with chording angle usually taken as30 electrical degrees. The actual voltage waveform from rotating machinery is never perfect.
Which chording angle is most useful in an alternator?
A chording angle of 30° is most useful in an Alternator as it gives the following pitch factors, 0.966 for fundamental, 0.707 for 3rd harmonic, 0.259 for 5th and 7th harmonics and 0.7.7 for 9th harmonics.
What are the characteristics of a harmonic component?
Harmonics are defined as an unwanted higher frequency component that is an integer multiple of the fundamental frequency. Harmonics create a distortion in the fundamental waveform. Harmonics usually have a lower amplitude (volume) than the fundamental frequency. What is Amplitude?
What is the difference between a harmonic and an overtone?
A harmonic is an integral multiplication of the fundamental frequency. An overtone is defined as any frequency which is greater than the fundamental frequency. Harmonics starts counting from the fundamental frequency. Overtones start counting after the fundamental frequency and starts counting from the harmonics.