Your question: Why DC shunt motor is a constant flux motor?

DC shunt motor is called a constant flux motor because flux depends upon the value of Ish and Ish =V/Rsh and both (V) and (Rsh) are constant therefore Ish is constant and hence flux remains constant. In dc shunt motor flux produced by field winding is proportional to field current Ish.

Why is flux constant in DC shunt motor?

Ans: In dc shunt motor flux produced by field winding is proportional to field current Ish. Here the input voltage is constant so field current and flux is also constant. Therefore, dc shunt motor is also called a constant flux or constant speed motor.

Why the shunt motor is called a constant speed motor?

If the load on the motor increases armature speed reduces and thereby cause a reduction in the back emf. Hence, when back emf decreases the armature current increases. Hence, a DC shunt motor always maintains a constant speed.

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What is the effect of constant flux in operating of DC shunt motor?

Since in case of a dc shunt motor the flux per pole φ is considered to be constant, therefore, torque increases with the increase in load current following linear law, i.e., torque-armature current characteristic is a straight line passing through origin O (Fig. 1.15).

Which DC motor is preferred for constant speed?

Explanation: Rotary compressor generally demand constant speed operation throughout the load. Sometimes, DC machines are not able to produce constant speed throughout the process hence, synchronous machine is used. 4.

What is the principle of DC shunt motor?

Construction and Working Principle

The working principle of a DC Shunt Motor is, whenever a DC motor is turned ON, then DC flows throughout stator as well as the rotor. This current flow will generate two fields namely pole as well as the armature.

What are the advantages of DC shunt motor?

Advantages of Dc shunt motor:

  • The power supply of the DC motor is any way cheap.
  • Shunt would motor able to runs at a predetermined speed.
  • The speed of a dc shunt motor is sufficiently constant.
  • Direct current machines can use for heavy industrial applications where the torque and speed wider range.

Which motor is constant speed?

Induction Motor – Constant speed with continuous operation – Stop in 2 sec. when switched off – Overrunn: 30-40 times – Possible for reverse rotation Suitable for Uni-directional … DKM Motor Co., Ltd.

Why is the DC motor preferred over AC motor?

AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.

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Why DC shunt motor is started on no load?

For DC shunt motor the field resistance is high and armature resistance is low so the variation of flux is very less when rated voltage is applied to the motor and motor speed does not exceeds rated speed at no load. So we can start the DC shunt motor with no load.

How many types are characteristics of DC shunt motor?

There are 3 main types of DC motor that are available:- Series, Shunt and Compound. These terms relate to the type of connection of the field windings with respect to the armature circuit.

Why do the starting current in DC shunt motor is high?

Answer: The starting current is high as there is no back EMF or counter EMF present in the armature circuit because atstarting counter EMF is zero. … It’s armature has very less resistance due to this it need more current at starting time. Hence DC starters are used to limit the starting current ofmotor.

What are the characteristics of a self excited shunt wound DC 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.

Which DC motor has maximum self loading property?

Which DC motor has got maximum self-loading property? Explanation: A differentially compound DC motor, flux reduces so sharply at small increase in load at higher values of load.

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Which motor has poorest speed control?

Which of the following DC motor has the poorest speed control? Explanation: DC series motor at no load condition gives infinite speed ideally. Practically it will damage all the armature circuit.

Which power is mentioned on a name plate of a motor?

Which power is mentioned on a name plate of a motor? Explanation: Name plate of the motor shows rated values i.e. rated speed, rated current, rated voltage. It also shows output power available at shaft when all other quantities are set to rated values.