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Why is the starting torque of a DC series motor more than that of a DC shunt motor of the same rating?
The torque of the DC series motor is proportional to the square of the armature current. That is why DC series motor has high starting torque. The DC series motor produces the highest torque among all kinds of motors.
Why a series motor has a higher starting torque than a shunt motor?
The field windings are thicker diameter, with fewer turns than in a DC shunt motor, so the resistance of the windings is lower. This allows the series motor to draw a large amount of current and produce a high amount of torque. This allows the series motor to produce very high torque on startup, for short durations.
Which has stronger torque series motor or shunt motor?
For light loads a series motor produces less toryue for the same arrnature current; for heavy loads it produces more torque than a shunt motor. Series motors are alwaye rigtdly connected to their loads, and never operated without some Ioad.
What is the value of starting torque in a DC series motor?
While in DC shunt motor torque is proportional to field and armature current but in this case value of field current is very less (because we take resistance of field winding very high) hence we can say that starting torque is proportional to armature current only.
Why the starting torque is low in DC shunt motor?
The high number of turns allows a strong magnetic field to be generated, but the smaller gauge wires provide a high resistance and limit the current flowing through the shunt coil. Therefore, the starting torque of a DC shunt motor is low, meaning that the shaft load must be small at startup.
Which DC motor is used for high starting torque?
Series wound DC motors
Series wound DC motors are best for applications that require high startup torque, without the need for speed regulation. Like a shunt motor, as a load is applied to a DC series motor, the motor speed decreases, which reduces the back EMF and increases the net voltage.
Which motor is suitable for high starting torque?
What type of motor has the highest starting torque?
DC Series motors
DC Series motors have high starting torque but induction motors have wide range of speed control.
Which motor is used for high starting torque?
Why is motor starting torque high?
In order to increase the starting torque, extra resistance should be added to the rotor circuit at start and cut out gradually as motor speeds up. The maximum torque is directly proportional to square of rotor induced emf at the standstill. The maximum torque is inversely proportional to rotor reactance.
Which applications require high starting torque?
Which of the following application requires high starting torque?
- Lathe machine.
- Centrifugal pump.
- Locomotive.
- Air blower.
Which is better DC shunt or DC series motor?
The DC shunt motor is best suited for the application where the speed regulation is required. The starting torque of the DC shunt motor is less compared to the starting torque of DC series motor. The flux in the motor remains constant and the motor delivers the constant torque.
When to add series winding to shunt motor?
If you need high starting torque in a shunt motor, add a series winding : during start, the very high starting current adds to the field strength and the starting torque. This was known as a compound wound motor. Thanks for contributing an answer to Electrical Engineering Stack Exchange!
How is the speed of a shunt motor related to the torque?
The speed of the motor is directly proportional to the back emf. The relationship between torque and speed of a shunt motor is given by T α φ Ia. (φ) flux is constant in the case of a shunt motor. So, torque is directly proportional to the armature current.
How is shunt field wound on DC compound motor?
With a DC compound motor, the majority of the field is wound for a shunt field but with a few turns of series winding on top. The shunt is connected across the field supply and the series turns are connected in series with the armature.