- THE RESISTANCE OF A MOTOR WINDING IS EXPRESSED IN HOW TO
- THE RESISTANCE OF A MOTOR WINDING IS EXPRESSED IN SERIES
The arrangement and speed-current characteristics are shown in the figure.īy the change in the resistance value, a voltage drop across the resistor will change.
THE RESISTANCE OF A MOTOR WINDING IS EXPRESSED IN SERIES
In this method, a variable resistor is attached in series with the armature. This armature resistance control method is one of the most commonly employed methods for controlling the speed of dc series motor. If the field coils are arranged in series, or parallel, the MMF produced by the coils changes hence, the flux produced also changes. This method is used generally in case of fan motors. In this method of speed control, several speeds can be obtained by grouping the several field coils as shown in Figs. Series-parallel connection of field coils
This method is generally used in DC traction motor. Hence, flux produce will change and speed of the motor will also change. Hence, by tapping we can select different no. You will get a better idea by the figure shown below. In this method tapped field control, we control the speed of the dc series motor by tapping on the series field winding. So, the current through field winding increase, so the flux increases and the speed of the motor reduces. So that, the motor reacts by drawing more current from the supply. If the armature current is reduced due to diverter resistance then flux will be increased. The arrangement of the parallel resistor and winding is shown in the figure.īy the resistor across the armature, we can change in the flux produced. In this method, Armature diverter is attached in parallel with armature winding of the motor. The arrangement of field diverter and speed-armature current characteristics is shown in the figure. The series field diverter speed control method is mainly used in dc series motor. Hence, the flux will be change and we can control the speed of the induction motor. Any desired amount of current can be passed through the diverter by changing its resistance. In this method, resistance is attached in parallel with the series field winding. The field diverter method is one of the methods for speed control of dc series motor by changing in flux. In the series motor, the variation of flux can be brought about by diverting the current flowing through the series field winding by any one of the following methods. If you want to know in brief read completely. In the Armature control method, we change the armature resistance which gives a change in the speed of dc series motor. In a flux control method, we change speed by varying flux per pole. So that the methods are used to control the speed of dc series motor are,
The speed of dc motor can be expressed as,Īs per the above equation, you can see that the speed of the dc motor can be changed by, The main advantage of dc motor is that we can control the speed of dc motor in a wide range.
THE RESISTANCE OF A MOTOR WINDING IS EXPRESSED IN HOW TO
How to control the speed of dc series motor?ĭc motors are generally available in three types: Dc series motor, Dc shunt motor, and Dc compound motor. here we will discuss in detail different methods of speed control of dc series motor. For speed control of dc series motor, various methods are used that we will see in this article. This article will explain you about the speed control of DC series motor. According to the application, speed control is required. In practical life, the numbers of motors are used for different applications.
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