The main challenges of the twenty-first century are to reduce energy consumption and environmental Safety. Since 2005, at regular meetings of the G8 leaders, these issues have been highlighted at the level of key global ones. To explore savings opportunities in energy products European countries the same year the EcoDesign directives were approved. Based on these directives, energy consumption in European countries should be reduced by 34 terawatt-hours per year.
Fans and air conditioners are among the leading group of equipment in terms of energy consumption in Europe. The amount of electricity consumption in Europe is this moment is 400 terawatt-hours per year, and by 2020 it can reach 650 terawatt-hours per year. In 2010, the European Parliament adopted strict measures to compulsorily reduce the electricity consumption of fans. Accordingly, everything European manufacturers ventilation equipment when creating their products are forced to take into account new energy efficiency standards.
EC engines are one of the most promising directions in the field of fan production. Already now EC engines found wide application in refrigeration, ventilation equipment, air conditioners, heat pumps. According to preliminary calculations, further use of EC technologies in these industries will reduce electricity consumption in Europe by more than 30%.

EC motors, or electronically commutated motors with permanent magnets, - This brushless motors direct current With external rotor, having a built-in control function and the ability to directly connect to the network alternating current. Unlike traditional engines, with transformer or electronic adjustment speed, in EC engines optimal and effective work at any speed it is provided by electronic (contactless) switching.
Built-in EC controller allows you to control the fan based on signals external devices (sensors temperature, pressure, humidity, timer, etc.) remotely through a dispatch system.
In addition to significant energy savings, EC fans, due to their low heating, do not require additional cooling, and the costs for them service maintenance minimal.
The presence of full automatic control of the operation of protection against overheating, phase imbalance, rotor blocking, etc. significantly extends the service life of EC equipment compared to traditional ones.
Due to the fact that EC fans have a design in which the engine is located inside the impeller, the possibility of it mechanical damage reduced to a minimum. In addition, this fan design allows for excellent system balancing, maximum compact size, minimum level noise.
Absence V-belt transmission, pulleys, tensioning mechanisms and other elements of traditional fans minimizes operating costs.
All of the above and maximum opportunity smooth and precise adjustment depending on external conditions without any additional equipment, minimizes the total cost of the system.
EC motors are more reliable in operation during network fluctuations. Unlike conventional asynchronous motors, which begin to overheat when the voltage is slightly exceeded, EC motors operate stably at voltages up to 480V, and when the voltage drops to a certain level, the motor issues an alarm and stops smoothly.
Despite the fact that EC fans are quite expensive today, their payback period is short.

A distinctive feature of the new digital format of Turgor AM vegetable and fruit storage technology from traditional foreign technologies is the use high-pressure radial centrifugal fans with EC motors (electronically commutated).

Turgor AM specialists, guided by many years of storage experience, believe that EC fans from German concern ebm-papst based on "green" technologies GreenTech are the best solution to provide technology for storing vegetables and fruits in accordance with the latest scientific research in the field of specific agricultural technologies, energy saving and ecology.

These fans have been excellent for many years cope with harsh operating conditions that are observed in the agricultural sector: humidity, vibration, dust, dirt, temperature changes, etc. The engine has a dust- and moisture-proof design and is equipped with wear-resistant bearings.

U EC motors efficiency is more than 90% at any speed. Increased efficiency means not only best use primary energy, but also that during operation less heat will be released into the environment.

Compared to standard fans With asynchronous motors EC fans consume 50% less electricity.

On the graph: the difference between AC (asynchronous motors) and EC (electronically commutated motors) technologies

EC technology can be used in the entire range shaded in blue. In addition, in the dark blue field, EC technology has clear power reserves compared to AC technology.

In the area of ​​smooth control, the absolute and relative savings are significantly higher. Compared to conventional phase control, EC technology, depending on the operating point, consumes 2 times less energy.

Maximum performance guaranteed!

EC fans have precise, very delicate and smooth speed control from 0 to 100%. Thanks to this, a uniform flow rate is ensured, despite obstacles of different characteristics, which allows, without additional equipment, to achieve effective air distribution with uniform speeds in the product and throughout the entire volume of the storage area.

Thanks to the external rotor motor design, the fans have a very compact dimensions . The EC motor is integrated directly into the impeller, resulting in significantly reduced installation dimensions.

Electronics and motor form a single unit, not required optional equipment : EMC filters, shielded cables or external motor circuit breakers, etc.

Cost approvals during commissioning also practically not needed, as well as grounding and shielding measures. Therefore, these fans for ventilation units, for example, as an active ventilation and microclimate module PTK "Turgor AM", are a real plug-and-play solution("plug and play"). This solution helps to get rid of a large number of individual parts, making the installation process more convenient and efficient.

The operation of EC fans is controlled via digital interface. This allows network a large number of fans, while allowing you to very conveniently balance the performance of each fan in accordance with specific needs.

Thereby handling of equipment is greatly simplified from commissioning configuration to service, fault diagnosis and maintenance.

Ventilation with EC motors

Systems ventilation, heating and air conditioning are the largest consumers of energy in buildings. They account for up to 70% total energy consumption.

It is necessary to make the most efficient use of available energy, reuse it where possible, and use free renewable energy environment(soil, air, water).

Money saved is money earned, and the best renewable energy is energy that is not wasted.

Our company offers design , installation , adjustment new systems energy-saving ventilation, and modernization and reduction of energy consumption existing systems.

One of the ways to reduce energy consumption in microclimate systems is the use of Electronically Commutated motors with built-in control electronics or, more briefly, EC motors.

EC motors are attracting increasing interest from consumers, specialists and manufacturers due to a radical reduction in energy consumption, an increase in equipment productivity and the period of its uninterrupted operation.

Fans with electronically commutated EC motors consume up to 50% less energy than conventional fans. Operating costs when using them are reduced by an average of 30%. In many countries, consumers and manufacturers of ventilation equipment are switching en masse to EC fans, because on the scale of an object, an enterprise, and even more so a city or country, this leads to enormous savings in energy and money.

The electronically commutated EC motor is innovative development German company ebm-papst Mulfingen, which is unique in that it integrates electronics directly into the engine.

Built-in electronics guarantee full control over energy consumption, accurate, smooth and automatic support of parameters. IN conventional fans To achieve similar performance, additional control equipment is required.

The undoubted advantage of the EC engine is very high efficiency at any rotation speed, reaching more than 90%, due to the fact that its rotor is external with permanent magnets and there are no heat losses, inevitable in the case of a squirrel-cage rotor of an asynchronous motor.

Efficiency comparisondifferent types of electroengines

Providing high power, fans equipped with EC motors are characterized by a low noise level, which is especially important when used as part of equipment for public facilities (supermarkets, hotels), as well as near residential buildings and in the domestic sphere.

EC fans are characterized by high performance And optimal control over the entire range of rotation speeds. They differ long term service - up to 7-8 years of continuous operation. At the same time, due to the exceptional reliability of the equipment, maintenance is reduced to a minimum.

Operating principle and deviceEU-engine

Driven by an electronic switching device (controller), the EC motor is a synchronous electric motor DC with an external rotor, which, unlike conventional engine has no rubbing or wearing parts, such as commutator and brushes.

In the magnetic field created by permanent magnets built into the rotor, the field vector is controlled by changing the direction of the current in the stator winding. At each moment of time, the controller calculates and supplies the stator winding with the current polarity, which is necessary to ensure continuous rotation of the rotor at a given speed.

The EC motor has an outer rotor containing permanent magnet segments. Rotor rotation is controlled through a controlled supply of electricity to the stator winding depending on the rotor position, which is monitored using Hall sensors, as well as specified control parameters coming, for example, from external sensors of the appropriate type in the form of current (4-20 mA) or potential (0-10 V) signals.

EC motors can be connected to a DC power source or via a built-in switching module to an AC power supply (220 V, 380 V). Using a standard RS-485 interface or a special ebm BUS, it is possible to control a fan or a group of fans via a computer. It is also possible to use Bluetooth technology. Provision is made for issuing alarms and alarms, as well as ensuring monitoring of system operation.

By using electronic controller The EC motor can be used to control the fan using a temperature sensor, pressure sensor or other parameters. The electronic board of the EC controller does not require maintenance.

Key BenefitsEC motorto her:

• Low power consumption - high Engine efficiency(more than 90%) due to the absence of heat losses, reduces energy costs by 30-50% compared to asynchronous motors. With speed control, energy consumption is reduced by 4-8 times!
• Long service lifeAnd high reliability work due to the absence of rubbing brushes, a commutator and inrush currents when the fan starts, as well as thanks to the built-in power protection (more than 80,000 hours of continuous operation).
• Minimumnoise leveland no vibration at any rotation speed (the noise is 20-35 dB(A) lower than that of traditional fans! There is no resonant noise accompanying the operation of the motor with an external frequency converter.
• Compact and reduced weight - the required pressure and air flow can be obtained using a smaller fan, thereby reducing general dimensions and weight of ventilation units.
• Reduced heat generation - The EC motor generates virtually no heat during operation, while the AC asynchronous motor has operating temperature up to + 75°C.
• No high inrush currents thanks to the smooth start of EC fans while starting current AC fans are usually 5-7 times rated. The trouble-free operation life of the EC motor increases, the cross-section of electrical cables and the parameters of the starting equipment are reduced.
• Smooth and precise regulation fan speeds - performance changes are possible depending on any control signal (temperature, humidity, pressure, air quality, etc.).
• Built-in control allows you to avoid without an additional external controller, frequency converter, or the need to lay a shielded cable to the converter. External sensors are directly connected to the engine.
• High efficiency is achieved even at low revs unlike motors with frequency converters.
• Safety - built-in protection against overcurrent, overheating, phase loss, voltage surges, Automatic blocking engine in an accident. Not required additional devices protection. Trouble-free operation provided in unfavorable conditions environment and wide range rated voltage: 1~200..277 V or 3~380..480 V.
• Remote centralized control and monitoring. EC fans can be controlled remotely with high precision, including via the Internet, and can be networked for collaboration. Remote control of all fan operating parameters.

EC-motors: what, where, why and what for

E. P. Vishnevskiy, Candidate of Technical Science, technical Director, United Elements Group
G. V. Malkov, Product Manager

Specialists today are becoming more oriented on purchasing of energy saving equipment. It is more expensive than traditional, but fully pays back for itself in the process of operation.EC-motors described in the article allow for energy consumption reduction while increasing the equipment performance and time-to-fail.

Keywords: EC-motor,EC-fan, energy saving equipment

Description:

Currently, specialists are increasingly focusing on purchasing energy-saving equipment. Compared to the traditional one, it is more expensive, but it fully pays for itself during operation. EC motors, which this article is devoted to, make it possible to reduce energy consumption, while increasing equipment performance and its uninterrupted operation life.

EC motors: what, where, why and why

Energy savings when using EC systems in various areas

conclusions

Summarizing all the advantages of systems acquired by using EC technology, we can highlight the main thing: EC fans with electronic control smoothly respond to changes in output power requirements and operate in particularly economy mode part load and insensitive to voltage fluctuations. EC fans provide up to 30% consumption reduction electrical energy compared to conventional three-phase AC fans.

Literature

1. Vishnevsky E.P. Energy saving in the design of microclimate systems for buildings // Plumbing, Heating, Air Conditioning (S.O.K.). – 2010. – No. 1.
2. Vishnevsky E. P., Chepurin G. V. New European standards in the field of HVAC // Plumbing, Heating, Air Conditioning (S.O.K.). – 2010. – No. 2.
3. EC fans in heat pumps // Plumbing, Heating, Air Conditioning (S.O.K.). – 2008. – No. 6.
4. EC fans for vegetable stores and mushroom chambers // Plumbing, Heating, Air Conditioning (S.O.K.). – 2010. – No. 1.
5. Excellent climate and low energy costs with EC fans in Airius air circulators // Plumbing, Heating, Air Conditioning (S.O.K.). – 2008. – No. 2.
6. The synergy of EC motors and FCUs // Modern Building Services. 2006, August.
7. EC motors for unit coolers // Product Bulletin. 2007, October.
8. GOST-R 52539-2006. Air purity in medical institutions.
9. General requirements.

Supply and exhaust ventilation and air conditioning systems for premises for various purposes that require an economical solution and a controlled ventilation system. The use of EC motors in the VKM fan made it possible to significantly reduce electricity consumption (about 35%) and at the same time provide high aerodynamic characteristics and low noise levels. This is especially important when fans are used in systems of public facilities (banks, supermarkets, restaurants, hotels, etc.), near residential buildings, as well as in the domestic sphere (for example, ventilation of private swimming pools). Thanks to EC motors, the fans can be easily networked and controlled centrally. The steel body provides reliable operation for outdoor installation. Designed for connection with round air ducts with a diameter of 160, 200, 250, 315 mm.

Design

The fan housing is made of polymer-coated steel. New technologies for manufacturing structural elements ensure absolute tightness of the housing. For more convenient connection and use, the fan can be equipped with a power cord with a plug (VKM... ES R).

Engine

High efficiency external rotor electronically commutated (EC) DC motors equipped with backward curved impellers are used. Such motors are by far the most advanced solution in the field of energy saving. EC motors are characterized by high performance and optimal control over the entire speed range. The undoubted advantage of an electronically commutated motor is its high efficiency (up to 90%).

The motors are equipped with rolling bearings to ensure longer period operation (40,000 hours). To achieve accurate specifications, safe work And low level noise during assembly, each turbine passes dynamic balancing. Motor protection class IP 44.

Speed ​​adjustment

The fan is controlled using an external control signal 0-10 V (performance adjustment is carried out depending on the level of temperature, pressure, smoke and other parameters). When the value of the EC control factor changes, the fan changes the rotation speed and supplies exactly as much air as is necessary for ventilation system. Maximum speed fan rotation does not depend on frequency electric current in a network (it is possible to work both in a network with a current frequency of 50 Hz and 60 Hz). Fans can be combined into a single computer control network. Software allows you to control the operation of networked fans with high precision. All system parameters are displayed on the computer display, and, if necessary, you can set an individual operating mode for each fan in the network.

Installation

Installation at any angle relative to the fan axis is allowed. Connection to the wall is carried out using mounting brackets, which are included in the delivery set. Power supply to the fan is carried out through the external terminal box