![]() ![]() ![]() The above picture shows the amplitude of the sine wave. As the instantaneous value gives the positional value of the sine wave we can plot the graph on the sine wave. In fact, to find the instantaneous voltage we multiply the maximum or peak to peak voltage of the sine wave with the sine of the coil rotation angle.Īngle of rotation of coil in a magnetic field is θ = ωtįor a known value of a maximum voltage of the sine wave, we can calculate the instantaneous voltages along the waveform. The displacement of the sine wave is found by the angle of rotation of the coil. Instantaneous voltage = Maximum voltage x sin θīack to top Displacement of a Coil With in a Magnetic Field To find the instantaneous voltage value of the sine wave, we depend on Maximum voltage of the sine wave. In the above diagram v1, v2, v3, v4, v5, v6…… are the instantaneous voltages of the sine wave. The voltage of a waveform at a given instant in time is called “Instantaneous voltage”. Instantaneous voltage is the voltage between two points at a particular moment in time. The number of poles vs speed of a 50 Hz frequency machine is The number of poles vs speed of a 60 Hz frequency machine is Ω is the angular velocity of the sine wave Ω = (2 / n) where n represents the no of poles Generally we say ω = 2π f, but in case of rotation takes place because of magnetic poles, we write the angular velocity as The relation between the RPM of the coil, the frequency of the produced sine wave and the number of poles is given below. The number of poles is always an even number. For suppose a shaft of a motor is completing 100 revolutions in a minute, then the speed of the motor is said to be ‘100 RPM’ This means ‘The number of revolutions made by a coil’ is called “RPM”. The basic method for generating sine wave is “ Basic single coil generator” which is already explained in our previous article “AC theory”. There are many methods to generate sine wave. It’s most basic form as a function of time (t) is The length of this repeating piece of the sine wave is called the wavelength. We can define the sine wave as “The wave form in which the amplitude is always proportional to sine of its displacement angle at every point of time”.Īll waves can be made by adding up sine waves. The sine or sinusoidal wave is a curve that describes a smooth repetitive oscillation. Displacement of a Coil With in a Magnetic FieldĪmong all the waveforms, sine waves are frequently used because of their ease of representation and some specific advantageous characteristics.
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