Tehran International Oil Exhibition

The visit of the Honorable Minister of Oil to the latest achievements and products of Roshd Sanat Niroo Company at the 25th Tehran International Oil Exhibition

The visit of the Honorable Minister of Oil to the latest achievements and products of Roshd Sanat Niroo Company at the 25th Tehran International Oil Exhibition

 

Roshd Sanat Niro (RSN), a knowledge-based company, as a domestic manufacturer of all kinds of explosion proof high voltage electric motors operated in the oil and gas industry, had an active presence in the 25th Tehran International Oil Exhibition. In this exhibition, the latest achievements of RSN in the field of designing and manufacturing explosion-proof high voltage electric motors were displayed to the public. Among the most important visits was the presence of the Honorable Minister of Oil and his accompanying delegation at the RSN booth. During this visit, the respected oil minister emphasized on the use of domestic products.

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Duty Cycle – Working regimes in electric motors

Duty Cycle - Working regimes in electric motors

(S1): Permanently working with constant load (Continuous duty)

The electric motor keeps a stable and constant temperature under rated load. Electromotor with duty cycle (S1) works continuously, without its temperature exceeding the allowable temperature.

(S2): Working with a constant load in a short time (Short time duty)

The electric motor works in a short period with a nominal load. In this duty cycle category or (ΔT-C) should be shorter than the stop period and temperature loss. Intervals of 10, 30, 60, and 90 minutes are recommended for working time.

(S3): Intermittent periodic duty

In this category, the electric motor has a working and stop range as a percentage. It should be noted that in (S3) mode, the effect of starting and stopping current on the temperature rise of the electric motor is negligible. Recommended values for electric motor working cycle are equal to 15, 25, 40 and 60 percent.

(S4): Intermittent periodic duty with starting

In this category, the electric motor has a heavy starting cycle, operating at rated load and stopping. You can see these items in the sections (ΔTc), (ΔT*)) and (ΔT0) of the image below. The electric motor in this category is stopped by the force of the load or mechanical brakes, and its stopping process does not affect the temperature increase of the coils.

(S5): Intermittent periodic duty with starting and breaking

In this category, the electric motor has a heavy starting cycle, working with rated load and stopping with electronic brake. In simpler words, in class (S5) in addition to working with rated power, the effect of starting and stopping with electronic brake is also taken into account on the temperature increase of the coils.

(S6): Regular periodic continuous operation: (Continuous duty with Intermittent periodic loading)

In this class, the electric motor is always on, but its working range is defined as full load (ΔT-C) and without load (0-T). In other words, the electric motor in this class will not work with rated load. The recommended values for a 10-minute work interval are 15, 25, 40, and 60 percent.

 

 

(S7): Continuous duty with starting and breaking

In this category, the electric motor is always working in a cycle that is repeated in the form of start-up, working with nominal load and electronic braking. Electronic brake in this group is considered as reverse flow. Since the electric motor in category (S7) never stops, the moment of inertia of the motor and the load be used to express its working period.

(S8): Continuous duty with periodic speed changes with related predicted load: (Continuous duty with periodic speed /load changes)

In this category, the electric motor works continuously and the cycles of start-up, speed change and electronic braking are repeated without stopping. The speed selection in this electric motor is done by changing the number of poles and the load has a constant value at each speed. For example, we can mention the speed change in Dahlander electric motors. You can see the working cycle of the electric motor in the (S8) category in the picture below. According to the picture, each working cycle includes starting, working and stopping at three different speeds. The load of the electric motor at each speed has a specific value, and the electronic brake is used before changing the poles of the electric motor.

(S9): duty with non -periodic variations of speed and load

In this category, the amount of load and speed of the electric motor changes irregularly. In other words, in this mode, there is no regular cycle of starting, working, stopping, speed changing, etc. Changes in the load and speed of the electric motor are carried out within the permissible limits, but overload may also occur at moments. According to the picture below, in this working cycle, the amount of full load and overload is well-thought-out.

(S10): Duty with discrete constant loads and speeds

In this category, there are a certain number of separate loads and, if possible, different speeds. In the case of (S10), the loads and times have different values. For example, the electric motor can work without load for a certain period of time or it can be loaded to such an extent that the electric motor reaches equilibrium with the allowed temperature. The maximum load cannot exceed 1.15 times of S1 category

It should be mentioned that in the working periods (S3) to (S8), the electric motor operation time is generally much shorter than the time required to reach the heat exchange and equilibrium of the electric motor. The electric motor heats up alternately and cools down in each work cycle. Only after a large number of times of electric motor operation in work cycles (S3) to (S8) the electromotor reaches equilibrium and heat exchange.

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اخبار-رشد-صنعت-نیرو1

Opening of the new plant of knowledge based Roshd Sanat Niro Company (RSN) for the manufacturing of high voltage, high power and explosion-proof electric motors

Opening of the new plant of knowledge based Roshd Sanat Niro Company (RSN) for the manufacturing of high voltage, high power and explosion-proof electric motors

At government week commemoration period, the official opening ceremony of the new factory, the extension project of the Roshd Sanat Niro Company (RSN) was held in the presence of the honorable governor of Alborz province Mr. Dr. Abdullahi, the honorable governor of Savajbalag city, Mr. Dr. Alborzi and the honorable director of the Industry and Mining Organization of Alborz province Mr. Dr. Rabiei and other respected city and provincial officials.

This project was put into operation with an investment of more than 2,500,000,000,000 Rials (USD 11,900,000.00) by Roshd Sanat Niroo Company in a land area of about 15000 square meters within a year. Increasing the capacity of manufacturing and producing all kinds of explosion-proof electric motors, high-power and high-voltage electric motors, as well as creating new job opportunities in the region, are part of the goals of this project. Also, the launching of fundamental facilities, including a multi-megawatt dedicated substation, switchgear, transformer, load and the control equipment required to perform the tests required in the process of manufacturing high-power electric motors, are among the most important features of this project.

It should be noted that the process of designing and manufacturing high voltage electric motors with a power of more than 10 megawatts and DC electric motors with a power of more than 4 megawatts are currently being done in this plant.

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88888-1

Production of High Voltage EX d Electric Motors for the first time in Qazvin Science and Technology Park

Production of High Voltage EX d Electric Motors for the first time in Qazvin Science and Technology Park

ac electric motors for sale

High Voltage explosion-proof electric motor

High Voltage explosion-proof electric motor with Exd protection class manufactured in the country for the first time.

According to the public relations of the Ministry of Science, a number of knowledge-based products by Roshd Sanat Niroo Company entered the industrial production stage in one of the private technology units located in Qazvin Science and Technology Park.

In addition to active factories in Hashtgerd industrial city, this knowledge-based unit also runs an active research and development (R&D) unit in Qazvin Science and Technology Park. Thanks to specialists in the fields of electric, mechanic and metallurgy, it produces electric machines required for the country’s heavy industries, including oil, gas and petrochemicals, cement, power plants, mines and metals.

One of the most important knowledge-based products of Roshd Sanat Niroo Company is the production of Exd class explosion-proof electric motors, manufactured at a power of 550 kW and a voltage level of 6000 V which has successfully passed the required tests to obtain the ATEX certification.

One of the most important applications of explosion-proof electric motors is in the petrochemical, oil and gas industries. Due to the lack of domestic manufacturers, especially at the medium voltage and high voltage level, similar foreign models were used but now, this product can be produced in the Islamic Republic of Iran.

 Source: Ministry of Science, Research and Technology website

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Manufacture of 2.2 MW electric motor for pelletizing mills by domestic manufacturers

Manufacture of 2.2 MW electric motor for pelletizing mills by domestic manufacturers

ساخت موتور ۲٫۲ مگاوات

According to the Steel Reporter, Mohammad Khodabandeh, Head of Electrical and instrument Repairs of the Pelletizing Unit announced that: “For the first time, one of the mill motors of Line No. 1 of the Pelletizing Unit was replaced with a domestic motor by installation during the last 13 stoppage (cold line) days successfully brought up to line of operation. Explaining the motors used in each of the pelletizing unit’s mills, he added: “Each of these mills has two 2.2 MW motors with rotation speed of 1000 rpm and a rotor weight of 12 tons, yielding the driving force to rotate the mill container at a speed of 13.9 rpm through a gearbox and pinion.

The mill container with a diameter of 5.2 meters contains more than 200 tons of steel pellets with a size of 30 to 40 mm. According to the interior design of the mill container and its equipment, every hour, 240 tons of grit concentrate that is transformed from 95% granulation under 1 mm to 80% granulation under 45 microns and reaches the appropriate granulation for crude pellet formation.

According to this report, Rahmatollah Soltani, foreman of electrical and instruments repairs of pelletizing unit, also noted: this motor was manufactured domestically instead of foreign one by Roshd Sanat Niroo (RSN) Company in coordination with the spare parts purchase management department and technical office of iron making repair department. During the manufacturing process of this motor, production-line inspections and various performance tests were performed in Roshd Sanat Niroo Plant with the cooperation of the electrical specialists of the pelletizing unit and the technical office of iron making repair and also the spare parts purchase experts. By ensuring the correct operation of the motor, it was transported to Mobarakeh Steel Complex and the necessary planning was performed to install and run the motor at the stoppage of the pelletizing unit in July. This great measure was carried out with the support of the iron making management, follow-up of pelletizing unit personnel, spare parts purchasing management, pelletizing unit repair technical office, the support of the technical inspection manager, constructive opinions of electrical and rotary machinery department and RSN. At the end, it is necessary to thank and appreciate the cooperation of the procurement units, technical inspection, repair office and support of the iron making and procurement managers.

Click to view “Selected Products of Roshd Sanat Niroo Company”

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Vibrations and vibration analysis

Vibrations and vibration analysis

Mechanical vibrations are a type of movement of dynamic systems in the form of oscillation and are repeated over a period of time. In the simplest form, this type of movement can be simulated with a weight and a spring. By changing the initial position of the weight attached to the spring and releasing it, an oscillating motion occurs, the amplitude of which can be expressed by a sine function.

In general, there are two types of static and dynamic forces in machines. Vibrating forces are a type of dynamic force created by the presence of defects in the machine. Some areas of deficiency (deviation from the ideal state) include:

  • Design limitations
  • Manufacturing restrictions
  • Errors in initial installation
  • Operation errors
  • Issues during repairs

Since it is not possible to reach the ideal state, there is always limited vibration in the machinery, which is allowed. However, over time and due to the occurrence of subsequent defects, the amplitude of vibrations may increase over the allowable limit, which can be restored by analyzing the vibrations and taking appropriate corrective measures.

You can find out more about the basic vibration concepts and vibration analysis by downloading and reading the following articles.

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88888-1

Production of high voltage explosion-proof electric motor

Production of high voltage explosion-proof electric motor

ac electric motors for sale

According to the provincial group of the Young Journalists Club of Qazvin, the Public Relations and International Affairs of Qazvin Science and Technology Park announced: This product was designed and manufactured by one of the private sector Knowledge-based units located in this park, which has entered the industrial production stage.

One of the most important applications of explosion-proof electric motors is in petrochemical, oil and gas industries, which due to the lack of domestic manufacturers, especially at medium voltage and high voltage, similar foreign models were used and now this product can be produced in the country.

This knowledge-based unit, in addition to active factories in Hashtgerd industrial city, owns an active research and development unit in the province’s science and technology park. Using experts in the fields of electric, mechanic and metallurgy, it has produced electrical machines needed by the country’s heavy industries, including oil, gas and petrochemicals, cement, power plants, mines and metals.

Source: Young Journalists Club

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