• Technical Blog

Induction Versus BLDC Motors For The Oil And Gas Industry

The use of the Brushless DC motors with permanent magnets for large power applications is becoming very popular. A three-phase induction motor has a stall torque, making it easy to run; just connect it across the power lines. Also, it can be designed to run very efficiently at a given operation point, making it a very attractive choice for pump applications. By contrast, a BLDC motor does not have a stall torque and requires electronics to make it run. In spite of that, the motor can run very efficiently across a wide range of speeds and at a higher power factor. Therefore, the natural question is: Are the BLDC more or less fit than an induction motor? This presentation tries to answer this question by walking the reader through motor construction similarities and differences, the advantages and disadvantages of the use of each motor type, with a focus on the subsea oil and gas industry. Each motor kind has unique functional characteristics, making it the best fit for a given application.

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Magnets And Their Losses In Large Brushless Motors

The use of the rare earth permanents magnets in the electrical brush and brushless DC motors is very common in our days. A large popularity they have got in making small (fractional Hp) motors. Going forward to larger sizes (i.e. hundreds or thousands of HPs) the use of the permanent magnets remains still an attractive solution due to their low price. However, some precaution must be taken into the account when the use of the magnets is considered such as: the magnet type, its losses and their temperature rise associated. If you want to know more, please click the link below to see the full article written by our Director of Engineering, Dr. Dan Vasile, during his legacy with Powertec Industrial Motors.

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Finite Elements Modeling Of The Sheets Levitation In The Horizontal Electromagnetic Casting

The work deals with the numerical modelling of the electromagnetic field in the levitated sheets continuous casting device, describes in the US Patent 4,678,024. By means of the dedicated computing program, LEVITA, the influence of the physical structure, of the side guard configuration, and of the magnetic core properties are studied, on the transverse uniformity of the levitation electromagnetic force. The supply frequency choice and the liquid metal stability are analyzed.

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United State Patent Application Publication

A multi-phase linear induction machine includes at least one armature which can be disposed in an elevator hoistway and is configured to electrically conduct electromagnetic energy, and a plurality of stators which can be coupled to an elevator car that is configured to travel through the hoistway. Each of the stators are configured to conduct electrical current therethrough and generate an electromagnetic field in response to the current. The electromagnetic field induces eddy currents that flow through the at least armature to generate a magnetic force to move the elevator car through the hoistway.

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We listen to the customer needs, see the technology trend and push “the impossible” to become possible.

Dr. Dan Vasile - Director of Engineering