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This method is used in electric traction for the speed control of the drive The circuit diagram of this method is as shown in the below figure Fig4 Speed Control of DC Shunt Motor Methods of speed control for DC Shunt motor is similar to the DC series motor Armature control and field control methods also applicable to the DC shunt motor.
Speed control of dc shunt motor circuit diagram. The brushed DC electric motor generates torque directly from DC power supplied to the motor by using internal commutation, stationary magnets (permanent or electromagnets), and rotating electromagnets Advantages of a brushed DC motor include low initial cost, high reliability, and simple control of motor speed Disadvantages are high maintenance and low lifespan for high intensity uses. A DC shunt motor (also known as a shunt wound DC motor) is a type of selfexcited DC motor where the field windings are shunted to or are connected in parallel to the armature winding of the motor Since they are connected in parallel, the armature and field windings are exposed to the same supply voltageThough there are separate branches for the flow of armature current and field current. Hence, a DC shunt motor is able to selfregulate its speed, and can be referred to as a constant speed motor When a load is applied to a DC shunt motor, its speed decreases, but the motor is able to selfregulate and quickly compensate for the lost speed Image credit electrical4ucom Uses for DC shunt motors Because of their selfregulating.
A more efficient way to proceed is by using Pulse Width Modulation technique to Control the speed of our DC motor Also Read the Related Post – Stepper Motor Controller using ATC51 Microcontroller Circuit Diagram of PWM Based DC Motor Speed Control Components Required 555 Timer IC 12V DC Motor 1N5819 x 2 1N4007 100nF 100pF 10KΩ Resistor. Armature Resistance Control of DC Motor Shunt Motor The connection diagram of a shunt motor of the armature resistance control method is shown below In this method, a variable resistor R e is put in the armature circuit The variation in the variable resistance does not affect the flux as the field is directly connected to the supply mains. But, for a DC motor A, P and Z are constants Therefore, N ∝ K E b / Ø (where, K=constant) This shows the speed of a dc motor is directly proportional to the back emf and inversely proportional to the flux per pole Speed control methods of DC motor Speed control of Shunt motor 1 Flux control method.
The DC shunt motor circuit diagram is shown below, and the flow of current and voltage being supplied to the motor from the supply can be given by Itotal & E DC Shunt Motor Circuit Diagram In case of the shunt wound DC motor, this current supply will divide into two ways like Ia,& Ish, where ‘Ia’ will supply throughout the ‘Ra. The speed of the motor in either direction can be controlled using the POT as it controls the duty cycle of the output PWM signal Applications This circuit, where a DC motor is controlled using an Arduino UNO, can be used in applications like Arduino based robots, speed as well as direction control of DC motors, etc. Field Diverter Method This method uses a diverter Here the field flux can be reduced by shunting a portion of motor current around the series field Lesser the diverter resistance less is the field current, less flux therefore more speed.
Armature Resistance Control Method for DC Shunt Motor With this method, the speed of the DC motor can be controlled by controlling the armature resistance to control the voltage drop across the armature This method also uses a variable resistor in series with the armature. The direction of rotation of a DC shunt motor can be reversed by changing the polarity of either the armature coil or the field coil In this application the armature coil is usually changed, as was the case with the series motor Figure 1216 shows the electrical diagram of a DC shunt motor connected to a forward and reversing motor starter.
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