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Author: Brian Ribeiro

  • What is an AC drive?

    What is an AC drive?

    A Variable Frequency Drive (VFD), also known as a Variable Speed Drive (VSD) or Adjustable Frequency Drive (AFD), is an electrical device used to control the speed and torque of an electric motor. It does this by varying the frequency and voltage supplied to the motor, which in turn adjusts the motor’s rotational speed. VFDs are commonly used in industrial and commercial applications where precise control of motor speed is required. Here’s how they work and some of their key features:

    1. Frequency and Voltage Control: VFDs control the frequency and voltage supplied to an AC (Alternating Current) motor. By varying these parameters, they can increase or decrease the motor’s speed and torque. This allows for precise control of the motor’s performance.
    2. Energy Efficiency: One of the primary benefits of using VFDs is energy savings. They can significantly reduce energy consumption by matching the motor’s speed to the actual requirements of the load. When a motor operates at full speed all the time, it often uses more energy than necessary. VFDs enable motors to run at lower speeds when the load is light, saving electricity.
    3. Soft Start and Stop: VFDs can provide a soft start and stop for motors. This gradual acceleration and deceleration help reduce mechanical stress on equipment and improve the lifespan of the motor and connected machinery.
    4. Precise Control: VFDs offer precise control over motor speed. This is crucial in applications where speed and torque must be adjusted for specific processes, such as conveyor systems, pumps, fans, and compressors.
    5. Dynamic Braking: Some VFDs can perform dynamic braking, which converts excess kinetic energy into electrical energy, dissipated as heat. This feature can help stop a motor quickly and safely.
    6. Motor Protection: VFDs often include built-in protection features, such as overload protection, overvoltage protection, and under-voltage protection, which help prevent damage to the motor and connected equipment.
    7. Reduced Wear and Tear: By avoiding sudden starts and stops, VFDs reduce the mechanical wear and tear on motors and associated machinery. This extends the lifespan of these components and reduces maintenance costs.

    Remote Control and Monitoring: Many VFDs can be controlled remotely and integrated into automation systems, allowing for centralized monitoring and control of multiple motors and processes. VFDs are widely used in various industries, including manufacturing, HVAC (Heating, Ventilation, and Air Conditioning), water and wastewater treatment, and transportation, among others. They offer a cost-effective way to improve energy efficiency, process control, and equipment reliability. 

     

  • What are manual motor starters?

    What are manual motor starters?

    Manual motor starters are devices used to control the operation of electric motors in industrial settings. They serve several key functions:

    1. Starting and Stopping: As the name suggests, manual motor starters allow for the manual starting and stopping of motors. This is typically done through a switch or a button that an operator can engage or disengage.
    2. Overload Protection: They often incorporate overload protection, which helps to safeguard the motor against potential damage caused by overcurrents. This is usually achieved through thermal or magnetic means. The thermal protection works by detecting excessive current over a period, indicative of an overload condition, while magnetic protection responds to short-circuit conditions.
    3. Short-Circuit Protection: Some manual motor starters may also offer short-circuit protection, although this is often handled by separate devices like fuses or circuit breakers in many installations.
    4. Disconnecting Means: They provide a means of disconnecting the motor from the power source for maintenance or emergency purposes. This feature is crucial for ensuring safety during repairs or when resolving issues with the motor or associated equipment.
    5. Local Control: Manual motor starters allow for local control of a motor, meaning that the start and stop functions can be performed at the motor’s location. This is particularly useful in smaller or simpler systems where centralized control is not necessary or practical.
    6. Adjustable Settings: Many industrial manual motor starters have adjustable settings that allow operators to set overload protection thresholds according to the specific requirements of the motor and the application.
    7. Robust Design: Designed for industrial environments, these starters are typically built to withstand harsh conditions, including dust, moisture, and mechanical vibrations.
    8. Simplicity and Cost-Effectiveness: Manual motor starters are generally simpler and more cost-effective compared to automatic starters or those with more advanced control features. They are well-suited for applications where automatic control is not necessary, or where manual operation provides sufficient control.

    In summary, manual motor starters are fundamental components in motor control, offering basic functionalities such as start/stop control, overload protection, and a means of disconnection for maintenance and safety purposes. They are widely used in various industrial applications due to their simplicity, reliability, and cost-effectiveness.

  • What is the difference between an IGBT and a MOSFET? 

    What is the difference between an IGBT and a MOSFET? 

    IGBTs (Insulated Gate Bipolar Transistors) and MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) are both types of semiconductor devices, but they have different characteristics and are suitable for different applications.

    Here are some key differences between IGBTs and MOSFETs:

    1. Type of Device:
      • IGBT: Combines features of both MOSFET and bipolar transistor. It has a voltage-controlled gate like a MOSFET and a bipolar-like current-carrying capability.
      • MOSFET: A voltage-controlled transistor that relies on the voltage applied to the gate to control the flow of current between the source and drain terminals.
    2. Voltage Rating:
      • IGBT: Generally suitable for higher voltage applications (hundreds to thousands of volts).
      • MOSFET: Typically used in lower to medium voltage applications (tens to hundreds of volts).
    3. Current Handling:
      • IGBT: Well-suited for high current applications. It combines the voltage control of a MOSFET with the current-carrying capability of a bipolar transistor.
      • MOSFET: Generally used for lower to moderate current applications.
    4. Switching Speed:
      • IGBT: Slower switching speed compared to MOSFETs. Suitable for applications where switching speed is not the primary concern.
      • MOSFET: Faster switching speed, making them suitable for applications that require high-frequency operation.
    5. Efficiency:
      • IGBT: Lower conduction losses compared to a MOSFET at high voltages and currents. Suitable for high-power applications like motor drives and power inverters.
      • MOSFET: More efficient at low voltages and currents. Often used in applications where efficiency and fast switching are critical, such as power supplies and certain amplifiers.
    6. Applications:
      • IGBT: Commonly used in high-power applications such as motor drives, power inverters, and induction heating systems.
      • MOSFET: Widely used in applications where fast switching and efficiency at lower power levels are crucial, such as voltage regulators and electronic switching circuits.
    7. Gate Drive Requirements:
      • IGBT: Requires a positive voltage on the gate relative to the emitter for turn-on, but the turn-off can be controlled by reducing the gate voltage.
      • MOSFET: Requires a positive voltage on the gate relative to the source for both turn-on and turn-off.

    The choice between IGBTs and MOSFETs depends on the specific requirements of the application, including voltage and current levels, switching frequency, and efficiency considerations. Each device has its advantages and is better suited to different types of electronic circuits and systems.

  • Why is fluid flow management becoming increasingly important in the manufacturing industry?

    Why is fluid flow management becoming increasingly important in the manufacturing industry?

    The need for accurate measurement and control of fluids is ubiquitous in manufacturing processes, in research laboratories, during the transformation of raw materials into finished products and during packaging. Continuous measurement, control, and analysis of fluid flow using appropriate measurement technologies improve the reliability, performance, and uptime of industrial processes, as well as environmental sustainability and compliance with standards and regulations.

    Industrial fluid flow measurement and control technologies are well established for applications involving large pipes, but accelerating market trends present a distinct and pressing challenge: measuring flow in small pipes. The move towards faster, smaller, more compact and less expensive machines has increased the need to measure fluid flow in small diameter, densely spaced pipes. Examples include semiconductors, pharmaceuticals, biopharmaceuticals and life sciences, food processing, heating, ventilation and air conditioning, and any high-purity water application. Applications in small pipes and confined spaces require a new method of measuring and metering, and not just in terms of size. Manufacturers are looking for accurate, efficient and cost-effective technology that offers ease of use, low or no installation costs, reliable data and low energy consumption.

  • How to communicate through HMI Systems

    How to communicate through HMI Systems

    Human Machine Interfaces (HMIs) play a critical role in efficiently monitoring and controlling control systems, whether they are on a small scale or span multiple geographic locations. Regardless of the system’s scope, effective communication is essential as it ensures transparency, rapid responsiveness, and allows decision-makers to free themselves from a specific physical location. These goals can be achieved through three main approaches:

    Direct Access:
    Modern PCs are equipped with hardware that, when combined with well-designed HMI software, facilitates communication. The simplest and most established method is through an HMI’s web server. The procedure involves connecting the HMI to the internet via an Ethernet connection. The company’s data and functions become accessible through web pages and technologies like the cloud, allowing other mobile devices to access them via simple addresses. While security is a growing concern in open communication, web server technologies such as Apache HTTP and Microsoft IIS adhere to the latest security standards, including SSL and HTTPS security, ensuring user data integrity. User rights can be established to enhance security and reduce misuse of authority. Over-reliance on the internet can, however, lead to operational interruptions in the event of network breakdowns.

    Onsite IT:
    A more expensive but reliable approach involves using onsite IT hardware and software. This option provides more power and flexibility for distributing data across multiple devices but requires specialized hardware and software, along with ongoing maintenance. Multiple HMIs within a plant are connected through Ethernet ports, forming an intranet with all the functionalities of the internet, but on a local level. Information can be accessed in the same way as before through various devices, but with greater security and control. Setting up an internal IT network that extends to all corners of the plant and associated offices is necessary. The intranet should ideally be location-independent and connect all company assets, both enterprise and manufacturing. Security is less of a concern, but the network requires high maintenance and constant service to operate without interruptions.

    The Cloud:
    Cloud technologies can revolutionize the way information flows, allowing devices to interact in a more stable, reliable, and resourceful manner. Multiple redundant connections enable each device to connect to the cloud and access HMI functions through smartphone apps. These apps reflect changes across databases and spreadsheets stored in the cloud, which are subsequently reflected in the industrial hardware in place. Cloud systems offer flexibility, affordability, and high security. Examples include Amazon Web Services and Microsoft Cloud, which employ a high level of virtual and physical security and a range of backup mechanisms to ensure uninterrupted operations even in adverse scenarios. The cloud-based system represents the latest and most viable solution for HMI communications with remote devices. The widespread availability of the internet, including 4G cellular networks, and powerful mobile devices have transformed it into an industrial technology poised to establish itself over the coming decades.

  • Choosing the right Instrumentation device for chemical and petrochemical manufacturing processes

    Choosing the right Instrumentation device for chemical and petrochemical manufacturing processes

    The safety and efficiency of any chemical or petrochemical manufacturing process depend largely on the selection of the right instrumentation. From reactor pressure transmitters to distillation column level measurement, state-of-the-art technology is essential for successful operations.

    The excellent reliability and measurement accuracy of the chosen measuring instruments enable you to increase process performance to guarantee maximum availability and optimize operating costs. Improving installations by using measuring instruments that are adapted and specific to your processes means optimizing energy and raw material consumption. The performance thus obtained generates significant savings in operating and investment costs: Enhanced reliability and improved process availability Accurate measurement for a quality finished product A low failure rate to increase equipment safety and integrity Long-term stability to reduce service intervals and maintenance costs Short response times to cope with rapid process variations A durable range to guarantee the longevity of the equipment

    Choose pressure and level transmitters designed for the toughest environments. Pressure measurement is used in many industrial process applications in the chemical and petrochemical industries (distillation columns, reactors, separators, etc.). These applications are characterized by very wide temperature and pressure ranges, and operate in highly corrosive media (chlorine, hydrochloric acid, sulfuric acid, etc.). Level, flow and density measurements are obtained in real time from information obtained from differential, gauge or absolute pressure measurements.

    Fuji Electric has developed a wide range of hydrostatic level transmitters with diaphragm seal(s) that are resistant to the most severe chemical attack. They are ideal for the storage and supply of raw materials for processes (vats and buffer tanks, storage of solvents, toxic liquids, ammonia, chlorine, etc.). Our diaphragm seals pressure transmitters are temperature-compensated to ensure accurate, reliable measurements in all ambient and process conditions. The materials used in their manufacture guarantee a long lifespan (stainless steel, Hastelloy C®, Tantalum, Monel®, etc.).

  • What are the benefits of a hybrid SiC module?

    What are the benefits of a hybrid SiC module?

    A hybrid SiC (Silicon Carbide) module refers to a power module that incorporates both SiC and other semiconductor materials, often silicon (Si). This combination leverages the strengths of SiC while mitigating potential drawbacks or cost considerations.

    Here are several benefits associated with hybrid SiC modules:

    1. Enhanced Efficiency:
      • SiC devices are known for their superior material properties, including a wide bandgap, which results in lower conduction and switching losses. Incorporating SiC components in a hybrid module can enhance overall efficiency, especially in high-frequency and high-temperature applications.
    2. Improved Thermal Performance:
      • SiC has better thermal conductivity compared to silicon, leading to improved thermal performance in power modules. The hybrid approach allows for optimized thermal management, combining the benefits of both materials to handle high-power densities more effectively.
    3. Optimized Cost:
      • While SiC devices can offer superior performance, they can be more expensive than traditional silicon devices. A hybrid SiC module allows designers to achieve a balance between performance and cost by strategically using SiC where it provides the most benefit and using silicon for less critical parts of the circuit.
    4. Compatibility with Existing Designs:
      • Hybrid SiC modules can be designed to be compatible with existing systems and infrastructure. This allows for easier integration into current applications without requiring a complete redesign of the entire system.
    5. Flexibility in Design:
      • Designers have the flexibility to choose where to implement SiC components based on the specific requirements of the application. This adaptability allows for customization and optimization for different parts of the power electronic circuit.
    6. Reduced Switching Losses:
      • SiC devices have faster switching speeds compared to traditional silicon devices. Hybrid SiC modules can capitalize on this advantage to reduce switching losses, leading to increased overall system efficiency.
    7. Higher Temperature Operation:
      • SiC devices can operate at higher temperatures compared to silicon devices. Hybrid SiC modules benefit from this characteristic, enabling applications in harsh environments or those that require high-temperature operation.
    8. High-Frequency Operation:
      • The fast switching speeds and low losses of SiC devices make hybrid SiC modules well-suited for high-frequency power electronic applications. This can be advantageous in areas such as power supplies, converters, and motor drives.
    9. Compact Size and Weight:
      • The improved performance and efficiency of SiC devices allow for the design of smaller and lighter power electronic systems. Hybrid SiC modules contribute to reducing the size and weight of the overall system.
    10. Reliability and Longevity:
      • SiC devices often exhibit improved reliability and longevity due to their robust material properties. This can lead to longer lifespan and reduced maintenance requirements in certain applications.

    While hybrid SiC modules offer various benefits, the specific advantages will depend on the application requirements and the way in which SiC is integrated into the overall power module design. Designers need to carefully consider factors such as cost, efficiency, thermal performance, and compatibility with existing systems when choosing between hybrid SiC and other power module options.

  • What is the difference between single-phase and three-phase drives?

    What is the difference between single-phase and three-phase drives?

    A Variable Frequency Drive (VFD), also known as a Variable Speed Drive (VSD) or Adjustable Frequency Drive (AFD), is an electrical device used to control the speed and torque of an electric motor. It does this by varying the frequency and voltage supplied to the motor, which in turn adjusts the motor’s rotational speed. VFDs are commonly used in industrial and commercial applications where precise control of motor speed is required. Here’s how they work and some of their key features:

    1. Frequency and Voltage Control: VFDs control the frequency and voltage supplied to an AC (Alternating Current) motor. By varying these parameters, they can increase or decrease the motor’s speed and torque. This allows for precise control of the motor’s performance.
    2. Energy Efficiency: One of the primary benefits of using VFDs is energy savings. They can significantly reduce energy consumption by matching the motor’s speed to the actual requirements of the load. When a motor operates at full speed all the time, it often uses more energy than necessary. VFDs enable motors to run at lower speeds when the load is light, saving electricity.
    3. Soft Start and Stop: VFDs can provide a soft start and stop for motors. This gradual acceleration and deceleration help reduce mechanical stress on equipment and improve the lifespan of the motor and connected machinery.
    4. Precise Control: VFDs offer precise control over motor speed. This is crucial in applications where speed and torque must be adjusted for specific processes, such as conveyor systems, pumps, fans, and compressors.
    5. Dynamic Braking: Some VFDs can perform dynamic braking, which converts excess kinetic energy into electrical energy, dissipated as heat. This feature can help stop a motor quickly and safely.
    6. Motor Protection: VFDs often include built-in protection features, such as overload protection, overvoltage protection, and under-voltage protection, which help prevent damage to the motor and connected equipment.
    7. Reduced Wear and Tear: By avoiding sudden starts and stops, VFDs reduce the mechanical wear and tear on motors and associated machinery. This extends the lifespan of these components and reduces maintenance costs.

    Remote Control and Monitoring: Many VFDs can be controlled remotely and integrated into automation systems, allowing for centralized monitoring and control of multiple motors and processes. VFDs are widely used in various industries, including manufacturing, HVAC (Heating, Ventilation, and Air Conditioning), water and wastewater treatment, and transportation, among others. They offer a cost-effective way to improve energy efficiency, process control, and equipment reliability.

    Single-phase and three-phase AC drives are electrical systems used to control the speed and torque of AC (alternating current) motors. The primary difference between the two lies in the number of phases of the AC power supply they use and the motors they can drive.

    Single-Phase AC Drives:

    • Single-phase AC drives are designed to operate with a single-phase AC power supply, typically 120V or 230V in residential and light commercial applications.
    • They are commonly used for smaller loads, such as household appliances (e.g., fans, pumps, and some small machinery).
    • Single-phase motors have only one winding in the stator, which makes them less efficient for some applications and generally not suitable for high-power or industrial use.
    • Single-phase AC drives are less complex and generally more cost-effective for lower-power applications.

    Three-Phase AC Drives:

    • Three-phase AC drives are designed to work with a three-phase AC power supply, which is the standard in industrial and commercial settings.
    • They are used for a wide range of applications, from small motors to very high-power industrial machines.
    • Three-phase motors have three windings in the stator, which provides smoother operation and better performance, making them more efficient and suitable for high-torque and high-power applications.
    • Three-phase AC drives can provide more precise control over motor speed, torque, and direction and are commonly used in industrial automation and manufacturing.

    In summary, the main difference between single-phase and three-phase AC drives is the number of phases in the AC power supply they are designed for and the types of motors they can drive. Single-phase drives are typically used for smaller, low-power applications, while three-phase drives are used in a wide range of industrial and high-power settings.

     

  • The Evolution of HMI Systems

    The Evolution of HMI Systems

    The evolution of Human Machine Interfaces (HMIs) has unfolded over decades, influenced and propelled by emerging technologies in electronics, telecommunication, and power engineering. Over the past 30 years, HMIs have served communication and control purposes, adapting to evolving technology.

    1980’s
    In the 1980s, process flow diagrams dominated monitoring processes, with large walls dedicated to such diagrams, adorned with gauges, indicators, and switches for a realistic representation of industrial processes.

    1990’s
    In the mid-1990s, PLC manufacturers gained ground, utilizing proprietary Operator Interface Terminals for control. The mid-1990s saw the introduction of PCs to manufacturing, necessitating a real-time Operating System. With the advent of Windows OS, Distributed Control Systems migrated to PCs. Platform-independent software was introduced, shifting HMI towards a software-centric technology. Simultaneously, ethernet revolutionized connectivity, transcending previous boundaries.

    2000’s
    In the early 2000s, HMIs capable of operating in hazardous areas were developed. Distributed control systems focused on HMI software and PC hardware. Touchscreens became prevalent in industrial technology, offering ease of use and reducing reliance on keyboards and mice.

    2010-Present
    The continual rise of new technologies ensures ongoing evolution in HMIs. Regardless of their future form, these devices will remain vital on the plant floor. The entry of multitouch video technologies, like tablets and smartphones, has once again transformed the role and scope of HMIs. Manufacturers now explore HMIs dependent on cross-platform technologies, such as HTML5, with Cloud Computing Servers at the backend, enabling access, monitoring, and control from any global location.

  • What is the most important thing to consider when selecting a regenerative blower?

    What is the most important thing to consider when selecting a regenerative blower?

    • Optimizing the efficiency of a regenerative blower requires proper system design. To reduce friction losses, one of the most crucial things to think about is using large-diameter plumbing. The piping ought to be one size bigger or at least the same size as the blower outlet port.
    • Blower performance is impacted by high altitude because of decreased airflow volume and pressure. By subtracting 4% of the volume and pressure for each 300 meters above sea level, one can easily estimate these losses. A blower intended to produce 100 cfm at sea level, for instance, will produce 96 cfm at 300 m above sea level.
    • Although performance varies, most regenerative blowers run on 50- or 60-cycle (Hz) power. Pressure and volume at 50 Hz are usually 16 percent lower than at 60 Hz.
    • Blowers take around ten seconds to start up to full speed. During this period, the power draw exceeds the specifications for full-load operation. Engineers advise sizing breakers using full-load amps and generators using starting watts.
    • Since the exhaust air temperature of regenerative blowers rises with increasing pressure, the heat of compression must be taken into account when designing piping systems. For instance, the exit air may be too hot for plastic pipe if a blower is run at a higher pressure because of high friction losses. In those situations, before connecting to the plastic piping system, longer lengths of metal pipe or sections of heat-dissipating pipe must be considered.
    • Lastly, always keep in mind the “laws” of fan performance. Rotational speed directly relates to variations in airflow. The square of the speed ratio causes a change in pressure. Additionally, horsepower varies with the speed ratio’s cube.