Archive for the ‘Energy Efficiency – motors’ Category

Asynchronous motor starting system

February 3rd, 2017 | Make a comment | Posted in Energy Efficiency - motors
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megaphone-redNew guest article today by A.N. abotu motor starting systems. If any remarks or questions are welcomed, write a comment below.

The asynchronous motors are used for a wide range of applications. They are used in industrial processes, commercial buildings, recreational areas, at home, and other areas.

However, if motor is switched on directly from the mains supply, it draws a very high initial current. The current at startup is usually between five and seven times what the motor normally draws at full load, but only develops a torque of between 1.5 and 2.5 times the torque at full load.
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Checking phase sequence of 3 phase supply

January 26th, 2017 | Make a comment | Posted in Energy Efficiency - motors
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megaphone-blueToday, let’s read a guest post written by A.N, one of our loyal fellow electrical engineer. Since the end of year 2016 he has published articles quite often in the blog and we thank him. If you want to do like him, please send us mail.

The correct phase sequence is required for the proper operation of any three phase system. It ensures that the load works as desired, when incorrect, the equipment such as the motor may malfunction, rotate in the reverse direction. The phase reversal may damage the motor or the equipment the motor is driving.

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Causes of faults in electric motors and their effects

October 21st, 2016 | 3 Comments | Posted in Energy Efficiency - motors
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Toay, A.N. tells us about AC motors/electric motors and the causes of faults. If like him you want to discuss a topic that you like, send us a mail and we will publish it after a short review!

Failure in electric motors may occur at start-up or during operation. Most of the electric motor failures occur at start up due factors such as low insulation resistance, over-current or mechanical failures. Other causes include issues with the supply, operation environment or lack of maintenance.

Most of the motors, regardless of type and rating have a long service life and only require a minimum maintenance to ensure they do not malfunction. It is recommended to regularly maintain the motors and associated equipment, and to check for signs of aging of the insulation or other parts that may degrade the motor.

Main parts of an electric motor

Main parts of an electric motor | image: je-bearing.com


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Industrial application of Synchronous motors

July 14th, 2016 | 2 Comments | Posted in Energy Efficiency - motors
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D.Ros is so crazy about motors that everytime we receive an article from him, we know what it’ll be about. Despite of this, his material is always very interesting and well explained.

For our pleasure, here’s the latest article from him. He chose to make an insight to typical start-up profiles… Let’s read!

Understanding the basics of how synchronous motors work will surely help you take good decisions upon whether or not to use this type of motor, if you rather get a brushless exciter or not, and choose the right start-up method suitable for your application and power system’s availability.

The next thing you should get to know is how a typical start-up looks like, what problems you might encounter and what are the possible solutions to them.

Normal reactor assisted start-up profile of synchronous motors

Figure 1: Normal reactor assisted start-up profile of a synchronous motor

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Synchronous motors: Motor start-up strategies

June 6th, 2016 | 4 Comments | Posted in Energy Efficiency - motors
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Last day, D.Ros told us about brushless synchronous motor field exciters. Today, he focuses on motor start-up strategies. Enjoy and ask questions if you have any!

As time goes by and industries keep growing and growing exponentially, motors keep getting larger and sites keep moving further away from the power sources, however, most of the times, power systems can’t keep up with the voracious rhythm of industrial growth.

Figure 1 Motor start-up strategies: Failed control panel for an assisted starting method of a synchronous motor

Figure 1: Failed control panel for an assisted starting method of a synchronous motor

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