The conversion process can be achieved through dual conversion, utilizing a static frequency converter, or a combination of a motor and a generator called a rotating frequency converter. In the dual conversion method, the rectifier converts AC to DC, and the inverter converts DC to AC. Alternatively, the motor and generator can perform the conversion by changing the generator's speed.
Types of frequency converters
Before delving into the role of frequency converters in industrial applications, it's essential to understand the following types of frequency converters:
Single-phase converter: The single-phase static frequency converter features a multi-functional communication platform for network, local, or remote control and monitoring. It also includes communication packages such as USB and RS-232 serial ports.
Static inverters: These use 6- and 12-pulse converters, including IGBT topologies, to improve the efficiency of solid-state inverters. This is a significant advancement compared to other types of inverters. They are also designed to support equipment even under extreme electrical conditions.
Dynamic frequency regulators are designed to provide a higher level of reliability for control equipment and power systems. This is because they are designed based on hybrid rotary technology. Dynamic frequency regulators have a power range from 25 to 500 kVA.
Rotary frequency converters: In addition to converting voltage to frequency, they also provide reliable power to equipment. Rotary frequency converters can also be used as rotary filters to prevent blowouts.
Industries using frequency converters
Different industries have different frequency requirements, mainly depending on the power supply method of the equipment. Weapons and aviation systems require 400Hz, therefore, equipment used on the ground and operating at 400Hz will require ground power support.
Railway systems operate their signaling systems using 100Hz, 91.55Hz, or 25Hz. Docks and shipyards also require shore power conversion mechanisms. In 50Hz countries, there are often power systems operating at the same frequency, and frequency converters are needed to meet the power needs of ships being built, docked, or repaired in these countries.
If equipment is manufactured in one country and used in another, the voltage conversion requirement is typically higher. This also applies to frequency. Generally, 50Hz and 60Hz are the most common frequencies and can be found in most commercial machines. However, some applications require conversion to higher frequencies. Frequency converters have a wide range of applications across various industries.
Benefits of using frequency converters
As mentioned above, frequency converters are commonly used devices in many industries, including aerospace and shipping, where conversion between 400, 60, and 50 Hz is required. Frequency converters provide an efficient method for converting current from one frequency to another. This process offers several advantages, including:
Improve efficiency
Using a frequency converter allows pumps or motors to operate at high speeds while still meeting any power requirements. This helps ensure the motor isn't overworked, thus improving the operating efficiency of the motor or pump and reducing overall costs.
Extend machine lifespan and reduce maintenance costs.
Because machines operate more efficiently and at slower speeds, frequency converters ensure better performance and a longer lifespan, thus reducing the need for frequent maintenance. However, this doesn't mean proper and regular maintenance is bad; it simply means avoiding unnecessary spending on maintenance.
Essentially, frequency converters provide a way to operate motors and pumps more efficiently, thereby extending the lifespan of the machine. Without a frequency converter, the lifespan of the machine would not be as long as that of a machine with one. This is because operating at a higher efficiency reduces the stress on the machine, thus reducing the number of maintenance and replacements required.
Improve the process
Using frequency converters can also help businesses improve processes because they allow for better control over machine speeds. Success in any industry depends on processes, and frequency converters can significantly improve those processes.
Affordable price
Contrary to popular belief, frequency converters are actually much cheaper than before. The reduced price of frequency converters means a smaller initial investment, but the long-term benefits are far greater. Essentially, frequency converters are significantly cheaper than flow control valves and various traditional starters.
Compatible with foreign equipment
Pumps and motors used abroad typically operate at different frequencies. Therefore, equipping them with frequency converters will reduce the chances of problems and ensure the equipment remains trouble-free for as long as possible. As mentioned above, this will further help extend the equipment's lifespan and result in a significant return on investment.
