Armature shaft

Armature shaft manufacturers and their maintenance crews can effectively do the armature shaft repair for shaft armature misalignment more quickly and easily because of technological advancements and more sophisticated tools. The winding of the electric machine that carries alternating current is the armature shaft function in the field of electrical engineering. Even on DC machines, the armature windings conduct AC because of the commutator action (which periodically reverses the direction of the current) or because of electronic commutation, as is the case with brushless DC motors.

Depending on the kind of electric machine, the armature may be located on either the rotor (the component that rotates) or the stator (the part that remains stationary). When two rotating shafts are not parallel, this condition is known as misalignment. Misalignment can be caused by either an offset or an angular gap at the coupling.

Misalignment of the armature shaft material, such as an armature shaft bent and damage in the armature shaft bearing, is particularly common in rotating machinery and is often the primary factor contributing to the machine’s failure. The good news is that the technology available today makes it possible to diagnose misalignment concerns during the armature shaft manufacturing process in machinery such as motors, pumps, blowers, and fans much quicker and simpler. Once the issue has been identified, we are equipped with more advanced tools to overcome these problems, regardless of how basic or complex they may be, and achieve exact machinery alignment and/or resort to armature shaft replacement. Stay tuned for further discussion about armature shaft misalignment!

What is an Armature Shaft?

An electric machine’s armature is a component that generates power; depending on the type of machine, the armature may be either a spinning or a stationary section of the device. The axis of components that are installed onto an armature is described by the shaft, which is a single kind of hard rod that is positioned between two bearings. It ought to be wide enough to send out the appropriate torque with the engine, and it ought to be stiff enough to regulate some of the forces which are not in balance.

The interaction of the machine’s armature with the magnetic flux can occur in the air gap. The field element can consist of any stable magnets; alternatively, it can be an electromagnet that is shaped with a conducting coil like another armature. This type of electric machine is referred to as a doubly-fed electric machine. The armature always functions like a conductor and has a normal slope that is directed toward both the field and the direction in which the motion, torque, or force is being applied.

How Does Armature Shaft Works?

The interaction of two magnetic fields has the potential to set in motion the rotation of the armature. The field winding has the potential to create one magnetic field, while the armature has the potential to produce a second magnetic field when a voltage is being provided to the brushes to bring them into contact with the commutator. A magnetic field is produced whenever an electric current flows through the winding of an armature because of the way that it is wound. Because of this, the force of attraction will be directed toward one pole, while the strength of repulsion will be directed toward the other. When the commutator is attached to the shaft, it will begin to move to the same extent as the shaft, which in turn will cause the pole to become active. The armature will persist in its pursuit of the pole in order to spin.

If the voltage is not supplied to the brushes, then both the field and the armature will get excited, and the armature will be driven mechanically. Because it approaches and then flows away from the pole, the voltage applied is alternating current (AC). However, the commutator is connected to the shaft and regularly activates the polarity since it rotates. This means that the actual output may be seen across the brushes while operating in DC.

What are the Applications of an Armature

The following are examples of the applications that may make use of an armature.

  • The armature is the component of an electric machine that is responsible for the generation of electricity;
  • The armature may function either as a rotor or a stator in the machine;
  • This is used for the purpose of monitoring the current in DC motor applications.

Different Types of Shaft Misalignment

Misalignment arises in many sorts and magnitudes. The majority of specialists believe that there are five categories. Compound misalignment is the term used to describe situations in which the problem with alignment is the result of a combination of angular and offset misalignment. The following are the five:

  • Parallel Misalignment- This kind of misalignment occurs when the two shafts that need to be aligned have centerlines that should be parallel to each other, yet the centerlines of the two shafts are not aligned with each other.
  • A misalignment between two shafts in the vertical plane is referred to as vertical angle misalignment (VAM).
  • A shaft misalignment between two shafts in the horizontal plane is referred to as having a horizontal angle misalignment.
  • When a shaft is at an angle with respect to another shaft, but both shafts continue to function within the same vertical plane, this kind of misalignment is known as a combination of vertical angular and offset misalignment.
  • When a shaft is at an angle with respect to another shaft, yet both shafts continue to function in the same horizontal plane, this is an example of a combination of a horizontal angular misalignment and an offset misalignment.

What Causes Armature Shaft Misalignment?

Here are the primary causes of armature shaft misalignments:

  • A base plate that has been settled, resulting in a soft foot;
  • Torsion-induced deformation of the shaft during the starting process;
  • Insufficient or poor-quality alignment measurements owing to human inaccuracy;
  • Misalignment of the pipe’s parallel and angular dimensions caused by strain in the pipe; and
  • An increase in temperature that, when combined with other factors, may cause one piece of machinery to move in proportion to another.

The wobbling of the shaft and substantial vibration may be caused by a misalignment of the centerlines of the shafts, which can ultimately lead to the destruction of seals, bearings, and couplings. In order for a machine to live up to its projected lifespan, it is vital that any instances of misalignment and the underlying reasons be discovered and addressed.

How To Identify Armature Shaft Misalignment

By “prediction,” we really mean checking the worst-case misalignment in any given situation to make sure that the coupling’s ability to fix things is enough. The misalignment of a shaft has three main parts: parallel, angular, and radial. Each of these parts is three-dimensional. The following explanations should help you understand what’s going on.

1.) Diagnosis via laser shaft alignment system

When a machine first begins to exhibit symptoms of a problem, it is common practice to begin by looking for signs of shaft misalignment. The degree of misalignment at the coupling is determined by a laser shaft alignment system, which then computes the required machine movement to be carried out at the base of the shaft. Laser shaft alignment systems give real-time readings that are accurate and precise, allowing the user to determine when the alignment has been successfully attained.

2.) Vibration analysis

Vibration monitoring and analysis are becoming increasingly prevalent as a direct result of the rapidity with which contemporary data collectors can handle triaxial sensor inputs. There is a certain amount of vibration that is considered to be typical for a machine, but there are situations in which the vibration level rises or goes above the allowed limitations.

3.) Thermography

Through the identification of aberrant hot patches, thermography may give an early diagnosis of alignment difficulties. Incorrect alignment may lead to an increase in the amount of friction that occurs inside a machine, which in turn causes the temperature to rise. An electronic picture that depicts an item’s apparent surface temperature may be generated from the infrared data collected by a thermal imager after the infrared data has been detected and measured by the object.

4.) Oil analysis

When oil analysis reveals an abnormality in a condition or a parameter, urgent steps may be taken to determine the underlying source of the problem or to respond appropriately to an impending breakdown. By giving information about the overall state of an asset, oil, and impurities, oil analysis may assist in the detection of misalignment. Oil analysis may be difficult, which is why many businesses use specialized firms to carry out the process on their behalf.


Misalignment may result in many symptoms as well as significant problems with the equipment. The implementation of a preventative maintenance plan to check the proper alignment of equipment will save both time and money. By ensuring that the shafts are aligned at all times, you may enhance the energy efficiency, raise uptime, and boost manufacturing output. Please visit for additional clarification if you are interested in learning more about armature shaft misalignment.

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Julia Carpenter
She graduated with a Bachelor of Arts (B.A.) and A.B.J. in Journalism from the University of Georgia. She has 13 years of experience in content writing. She writes about money, finance & science-related articles. Her articles have been featured in popular magazines like CNN, Vogue & ELLE.


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