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What is the speed of a DC shunt motor?
The speed of a DC motor is directly proportional to the voltage across the armature terminals and inversely proportional to the flux (φ) due to the field windings (N ∝ 1 / φ), that is N ∝ 1 / Ish.
Why the shunt motor has good speed regulation?
Since torque is proportional to armature current, torque also increases. Finally, this increased torque allows the motor to increase its speed and compensate for the slowdown due to loading. Hence, a DC shunt motor is able to self-regulate its speed, and can be referred to as a constant speed motor.
Why does speed regulation occur?
If the load is applied to the DC motor or machine, the speed of the motor decreases automatically. Thus to maintain the constant speed, the difference between no-load and full-load speed (called Speed Regulation) should be maintained very less.
What are the characteristics of a DC shunt motor?
The change in armature current and torque on supplying load is graphically shown below. This increase in the amount of torque increases the speed and thus compensating for the speed loss on loading. Thus the final speed characteristic of a DC shunt motor, looks like.
Which is DC motor can provide zero speed regulation at full load without?
The motor capable of maintaining a nearly constant speed for varying load is said to have good speed regulation i.e the difference between no load and full load speed is quite less. The speed regulation of a permanent magnet DC motor is good ranging from 10 – 15% whereas for DC shunt motor it is somewhat less than 10 %.
When does the speed of a DC motor decrease?
On application of load the speed of a DC motor decreases gradually. This is not at all desirable. So the difference between no load and full load speed should be very less.
Why is a shunt wound motor called a constant flux motor?
Thus the field flux remains more or less constant, and for this reason, a shunt wound DC motor is called a constant flux motor. You can learn more about DC motors by studying our collection of over 1000 electrical questions.