Speed Regulation of a Series Wound DC Motor
Due to the self-regulating nature of a series wound motor, external methods are often needed to control its speed. Here are some common approaches:
- Variable Resistor: Adding a variable resistor in series with the armature circuit allows for manual speed control by adjusting the current.
- Solid-State Speed Controls: Electronic control circuits utilizing thyristors or transistors can offer more precise and automated speed regulation.
The Back EMF(Eb ) equation is given by
Eb = PΦNZ / 60A
Where,
P = Number of poles
A = Number of parallel paths
N = Speed of rotation(rpm)
Z = Total no of conductors in armature
Speed of rotation (N) = (Eb x 60A) / PΦZ
The speed of the motor is directly proportional to back EMF and inversely proportional to Magnetic flux(Φ).
However, the speed regulation of a series wound motor is poor. As the motor speeds up, the back EMF (E b) increases, opposing the applied voltage (V). This reduces the current (I) flowing through the motor, consequently lowering the magnetic field strength and torque. This inherent characteristic makes it unsuitable for applications requiring precise speed control.
Series Wound DC Motor or DC Series Motor
In electric motors, the series wound DC motor or DC series motor is one of the types of self-excited DC motor. The field winding of the series wound DC motor is internally connected to the armature winding and stands out for its robust starting torque and unique characteristics. Whereas in the shunt wound DC motor, the field winding is connected in parallel with the armature winding.
In this article, we will cover the topics of Construction, Voltage and current equation, Speed regulation and with the advantages, disadvantages and applications of series wound DC motor or DC Series Motor.
Table of Content
- Series Wound DC Motor or DC series Motor
- Construction
- Voltage and Current Equation
- Speed and Torque
- Speed Regulation
- Characteristics
- Advantages and Disadvantages
- Applications