What is the disadvantages of preventive maintenance of 3 phase induction motor?

3 phase induction motors have poor starting torque and high have in rush currents. Therefore these motors are not widely used for applications which require high starting torques like traction systems. Squirrel cage induction motor have poor starting torque.

What are the reasons for failure of three phase induction motor?

Potential causes of winding failure include over-voltage operation, excessive current, high ambient temperature or loss of cooling, an excessive number of motor starts or full reverses, physical damage and penetration of contaminants.

What are the disadvantages of a single phase induction motor?

Disadvantages: While single-phase motors are simple mechanics-wise, this does not mean that they are perfect and nothing can go wrong. On occasion they have been known to run slow, overheat, or even fail to start, overheat or run slow.

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In which induction motor maintenance is less?

Squirrel Cage Type Induction Motor:- Squirrel cage induction motor requires significantly less maintenance as it does not contain brushes, commutators, slip rings. Wound Rotor Type Induction Motor:- Since it contains slip ring, brushes so it does require maintenance time to time.

What are the disadvantages of induction motor operation with unbalanced supply voltage?

The negative effects of voltage unbalance on the performance of three-phase induction motors include: higher losses, higher temperature rise of the machine, reduction in efficiency and a reduction in developed torque [14].

What is the most common cause of induction motor failure?

Winding insulation breakdown and bearing wear are the two most common causes of motor failure, but those conditions arise for many different reasons.

Shaft imbalance

  • Dirt accumulation.
  • Missing balance weights.
  • Manufacturing variations.
  • Uneven mass in motor windings and other wear-related factors.

Is the most common cause of motor failure?

Low Resistance. The most common cause of motor failure, and arguably the most difficult to overcome, is low resistance. Low resistance is caused by the degradation of the insulation of the windings due to conditions such as overheating, corrosion, or physical damage.

What are the advantages and disadvantages of a single phase motors?

In this article, we have outlined some of the main advantages and disadvantages that you should be aware of when using such a unit.

  • Advantages. …
  • Lightweight, Compact Unit. …
  • Efficient Transmission. …
  • Less Substations Required. …
  • Disadvantages. …
  • High Insulation Costs. …
  • Not Uniform Torque. …
  • Cannot Handle Overload.
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Why are induction motors better?

The motor shaft rotates. Induction Motors induce the magnetic field within the rotor by implanting a short current in the squirrel cage. This concept effects higher losses in the rotor and causes higher heat and less efficiency. … Higher efficiency motors use copper because of its better electromagnetic behaviour.

What are the disadvantages of induction training?


Advantages Disadvantages
Employees will settle quickly into the job Takes time so reduces output
Employees will be made aware of important health and safety issues before starting the job
Employees will understand who the main personnel in the organisation are

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.

Is the advantages of preventive maintenance of 3 phase induction motor?

Due to the absence of Brushes, there are no sparks in the motor. It can also be operated in hazardous conditions. Unlike synchronous motors, a 3 phase induction motor has a high starting torque, good speed regulation and reasonable overload capacity.

What is overhauling of motor?

An electrical motor with its five major parts; rotor, stator, winding, terminal box and bearings require overhaul from time to time to ensure safe operation. … The process involves complete de assembly of electric motor, visual inspection, insulation checks, repairs, final check and reassembly.

What happens if the induction motor runs on unbalanced voltage?

A small amount of voltage unbalance may increase the current an excessive amount. The effect on the motor can be severe and the motor may overheat to the point of burnout. The voltages should be evenly balanced as closely as can be read on the usually available commercial voltmeter.

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What happens if one phase of a 3 phase induction motor fails?

This is called phase failure or single phasing. If a three-phase motor is operating and loses one of the phases, the motor will continue to operate at a reduced speed and experience vibrations. The current will also increase considerably in the remaining phases, causing an internal heating of the motor components.

What causes voltage imbalance?

Unbalanced voltages usually occur because of variations in the load. When the load on one or more of the phases is different than the other(s), unbalanced voltages will appear. This can be due to different impedances, or type and value of loading on each phase.