1.17, four important characteristics of a dc shunt motor, namely, torque, speed, armature current, and efficiency, each plotted against the useful output power, are shown. These curves are also known as performance curves of a motor.
What are characteristics of DC series and shunt motor?
Characteristics of DC compound motor
DC compound motors have both series as well as shunt winding. In a compound motor, if series and shunt windings are connected such that series flux is in direction as that of the shunt flux then the motor is said to be cumulatively compounded.
What are the characteristics of a DC series motor?
Characteristics of a DC Series Motors:
- Speed-Current Characteristic:
- Since on no load the series motor attains dangerously high speed, which causes heavy centrifugal force resulting in the damage of machine, series motors are not suitable for the services:
- Torque-Current Characteristic:
- Speed-Torque Characteristic:
What are the applications of DC shunt motor depending on its characteristics?
DC Shunt Motor Applications
- These motors are used wherever stable speed is required.
- This kind of DC motor can be used in Centrifugal Pumps, Lifts, Weaving Machine, Lathe Machines, Blowers, Fans, Conveyors, Spinning machines, etc.
Which type of motor characteristics are similar to DC shunt motor?
Speed-Torque Characteristics :
Similar to the dc shunt motor, the N vs T relation of the dc series motor is similar to N vs Ia (a parabolic curve) as shown in figure (c). At no-load, Ia will be low, and hence torque, thus speed will be very high. As the load increases, torque increases, and speed decreases.
What is the characteristics of DC?
The fundamental characteristic of a DC signal is the absence of changes in polarity. If you connect a DC voltage signal to a resistor, the resulting current will always flow in the same direction. The magnitude of the current may exhibit large variations, but the direction does not change.
What is a DC shunt motor?
A DC shunt motor (also known as a shunt wound DC motor) is a type of self-excited 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 voltage.
How the characteristic of DC series motor differs from DC shunt motor?
In a DC shunt motor, the armature and field (shunt) windings are connected in parallel. … In contrast, for a series-wound DC motor, torque increases as the square of armature current. This exponential torque-current relationship allows series-wound DC motors to provide high starting torque and handle high startup loads.
What is the difference between shunt and series motor?
A series motor respond by decreasing its speed with small increase in current for a given load torque. A shunt motor holds its speed nearly constant with large increase in input current for same amount of load torque.
What are the characteristics of DC generator?
Characteristics of DC Generators
- Open Circuit Characteristic (O.C.C.) (E/If) …
- Internal or Total Characteristic (E/Ia) An internal characteristic curve shows the relation between the on-load generated emf (Eg) and the armature current (Ia). …
- External Characteristic (V/IL)
What are the advantages and disadvantages of a DC shunt motor?
The installation of DC machines is expensive compare with other types of machines. Shunt motor is a constant speed motor, it would be disadvantages where it’s necessary to operate under variable speed. For the same current input, its starting torque is not a high as that of a DC series motor.
What are uses of DC shunt motor?
shunt motors are used wherever there is a request for stable speed. Shunt DC motors can be used in centrifugal pumps, lifts, weaving and lathe machines, blowers, fans, conveyors, spinning machines, and more.
What are the characteristics of a cumulatively compounded DC motor?
All the characteristics of the compound motor are the combination of the shunt and series characteristic. Cumulative compound motor is capable of developing large amount of torque at low speeds just like series motor. However it is not having a disadvantages of series motor even at light or no load.
What is the torque speed characteristics of DC shunt motor?
CHARACTERISTICS OF DC SHUNT MOTOR
For a constant value of Rsh and supply voltage, V>>Ish is also constant and hence flux is also constant. The equation represents a straight line, passing through the origin as shown in the figure. Torque increases linearly with armature current.