Shunt Motor Schematic

May 30, 2024 Post a Comment

Shunt motor schematic

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

What is the principle of shunt?

In electronics, a shunt is a device that creates a low-resistance path for electric current, to allow it to pass around another point in the circuit. The origin of the term is in the verb 'to shunt' meaning to turn away or follow a different path.

What is a shunt electric motor?

A shunt motor is a "winding-field DC motor" that generates magnetic field flux using electromagnets. Its field winding and armature winding are connected in parallel. The shunt motor is configured with a stator of concentrated winding and commutator rotor as shown in the figure.

How is a DC shunt motor connected?

In a DC Shunt motor the field winding is connected in parallel (shunt) with the armature. The shunt winding is wound from many turns of small copper wire and since it is connected across the DC field supply, its field current will be constant.

Why is it called a shunt motor?

In a DC shunt motor, the armature and field (shunt) windings are connected in parallel. A parallel circuit is also known as a shunt circuit; thus, the term, “shunt motor” is used.

What is the main advantage of a shunt motor?

The shunt-connected motor offers good speed regulation. The field winding can be separately excited or connected to the same source as the armature. An advantage to a separately excited shunt field is the ability of a variable speed drive to provide independent control of the armature and field.

What are two uses shunt?

Uses of shunt: -It is used in galvanometers to measure large currents. -It is connected in parallel to the galvanometer in a circuit so that it behaves like an ammeter. -It is used as a diode. -Measure current.

What is shunt and its use?

A shunt is an electrical element that creates a low resistance path in a circuit and allows the current to flow through it. A shunt is used for measuring the amount of current flowing through it. It is also used in circuits to protect from overvoltage.

How does a DC shunt motor start?

The back emf (Eb) is developed as motor armature starts to rotate in presence of the magnetic field. Initially, the back emf is zero, starting current is high. To limit this starting current, we use a starter. A three-point starter helps in starting and running the shunt-wound motor or compound wound DC motor.

Why does a shunt motor run slow?

Similarly when the load decreases, the excess torque speed ups the armature and the back emf increases. Then the motor draws less current which results in a decrease in torque and slows down to previous speed. Hence, a DC shunt motor always maintains a constant speed.

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.

Can a DC shunt motor be started with a load?

Since speed is constant and torque (τ) is proportional to armature current (Ia). So that, starting a shunt motor at a heavy load requires a high starting current. In order to avoid this high starting current, shunt motors are not started at heavy loads and they should be started without any load.

How do you test a DC shunt motor?

first test the field winding with a megohmmeter to check, that the winding has no short to the housing. Then check the current consumption of the field winding. If you can, start with a low voltage and rise it until you reach the nominal voltage. Look for the maximum current at the specification plate.

How do you change the direction of a DC shunt motor?

Detailed Solution. The direction of rotation of DC shunt motor can be reversed by reversing either field terminals or armature terminals but not both. The torque can be changed by changing either field flux or armature current. Hence the motor will rotate in the same direction by changing the supply connections.

How do you identify a DC shunt motor?

Notice how the field winding is wired in parallel with the rotor assembly – this is the defining feature of shunt DC motors. The field winding, which produces the constant magnetic field in the stator, is wired in parallel, or in shunt, with the armature windings in shunt DC motors.

Where is shunt motor normally used?

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.

Why DC motor has higher speed than shunt motor?

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. However, in a series wound motor, the increased voltage causes both the armature and field currents to increase.

What are the 4 types of DC motor?

There are 4 main types of DC motors:

Permanent Magnet DC Motors. The permanent magnet motor uses a permanent magnet to create field flux.
Series DC Motors. In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current. ...
Shunt DC Motors. ...
Compound DC Motors.

What is the main disadvantage of a shunt motor?

Dc motors are unreliable at low-speed operations. The size of Dc motors is large compared to alternative current motors. The installation of DC machines is expensive compare with other types of machines.

What is the disadvantage of shunt?

There are some disadvantages of a transistor shunt regulator are given below, It has poor efficiency for large load currents. It has high output impedance. The output DC voltage is not absolutely constant because both VBB and VZ voltages decrease with increase in room temperature.