which one is not result of motor fail to start

Hi there!

Hi there!

six main causes of electric motor failures:

1,Over-Current

2,Low Resistance

3,Over heating

4,Dirt

5,Moisture

6,Vibration

These causes are briefly explained below:

1. Over-Current (Electrical Overload): in several operating conditions, electrical devices will sometimes start to draw more current than their overall capacity. This unpredictable event will happen very suddenly and can greatly impact the motor. To avoid an over-current, there are some devices that require to be installed which will prevent it from happening. These devices are usually wired within the circuits and can automatically pack up the additional amount of current flowing within the circuit.

2. Low Resistance: Most motor failures occur thanks to low insulation resistance. This issue is considered to be the most difficult one to tackle. In the initial stages of motor installation, the insulation resistance is observed to be quite one thousand megaohms. After a while , the insulation performance starts to degrade at an alarming level because the resistance starts to decay gradually. After tons of research, an answer has been found which may prevent low resistance failures. There are automatic devices that test insulation resistance from time to time and safeguard rotating equipment is installed that forestalls such failures. It is important that the insulation performance is monitored at regular intervals.

3. Over Heating Excessive heat in motors can cause variety of performance problems. Overheating causes the motor winding insulation to deteriorate quickly. For every ten centigrade rise in temperature, the insulation life is cut in half. It has been concluded that quite 55% of the insulating failures are caused by over heating.

Over heating occurs thanks to variety of things . Every electric motor has a design temperature. If a motor is started off at a nasty current value, it starts operating during a much warmer condition than the planning temperature. It is vital that the motors should be matched with their ideal current values.

Overheating also occurs when an electrical motor is forced to work during a heat environment. This causes the speed at which heat are often conducted to scale back at an alarming rate. The area where electric motors are operating must have a correct cooling system and a ventilation should be there just in case the cooling system stops working.

4. Dirt: Dirt is one among the main sources that cause damage to the electrical motors. It can damage the motor by blocking the cooling fan which causes its temperature to boost . It can also affect the insulating value of the winding insulation if it settles on the motor windings. Proper steps should be taken to stop the motors from dirt. Shielding devices are available which are used for this purpose.

5. Moisture: Moisture also affects the performance of electrical motors. It greatly contributes in the corrosion of the motor shafts, bearings and rotors. This can lead to an insulation failure also. The motor inventory should be kept dry all the time.

6. Vibration: There are variety of possible causes of vibration, like misalignment of the motor. Corrosion of parts also can cause the motor to vibrate. The alignment of the motor should be checked to eliminate this issue.

Thanks