Industrial and medical applications Magnetic sensors continue to grow strongly in the next few years
According to IHS iSuppli's magnetic sensor market tracking report, the semiconductor magnetic sensor market in industrial and medical applications grew moderately by 6% last year, and the green energy trend is the main factor driving its growth.
In 2011, industrial and medical magnetic sensor revenues were $118.2 million, compared to $111.9 million in 2010. Although the industry's revenue is less than other magnetic sensors in the automotive and wireless-consumption sectors, it will continue to expand the sensor market in the coming years. By 2016, revenue from this magnetic sensor segment will increase to $175.5 million, as shown in the chart below, with a five-year compound annual growth rate of 8%.
Magnetic sensors continue to grow strongly in the next few years
The magnetic sensor market consists of Hall effect and magnetoresistive semiconductor ICs used to track angular velocity and linear angle in machines and products, or to detect and process magnetic fields to establish positional relationships. In industrial and medical applications, magnetic sensors are used in motors to improve their energy efficiency. Sensors are also used in a range of medical devices involving some form of motor control, comparing pumps.
70% of last year's operating income came from industrial applications, and medical applications accounted for the remaining 30%.
Magnetic sensors are widely used in industrial applications
In industrial applications, renewable energy systems such as solar installations and wind turbines have been the main growth points for magnetic sensors. On the other hand, the power consumed by various types of motors is estimated to be 45%. If the efficiency of the motor can be improved, it is possible to save a lot of energy. Government legislation focuses on reducing energy consumption and is also good for sensors.
Examples of magnetic sensors used in motors include low voltage AC and DC motors, three phase induction motors, stepper and servo motors, single phase motors and compact motor drives.
In other industrial applications, magnetic sensors can be used for uninterruptible power supplies (UPS), welding systems, robotics, train transportation infrastructure, off-road vehicles and forklifts for machines such as computer servers.
In industrial applications, the most popular types of magnetic sensors are current sensors, including shunt resistors, Hall-effect integrated circuits, current-sense transformers, open-loop and closed-loop Hall devices, and fluxgate sensors. In many applications that measure currents below 50 amps, such as residential solar inverter applications or small UPS systems, simple resist bar or shunt is used.
But as the measured current strength increases, shunt becomes bulky and expensive. In applications with higher currents such as large inverter motors, open-loop and closed-loop Hall sensors use Hall-effect ICs in a small package; they also increase integration and include an application-specific integrated circuit in the package. Hall IC is also used in inverter control applications for industrial washing machines.
In addition to current sensors, independent Hall-effect ICs or magnetoresistive sensor switches also have a smaller market for magnetic sensors that are used for motor rectification to reduce ripple and improve performance, or for position measurement.
Magnetic sensors play a key role in medical applications
The application of magnetic sensors in the medical field, although smaller than the industrial field, can save lives or improve the quality of life. Mainly used in medical devices using commutation sensors for motor control, such as ventilator applications; infusion, insulin and syringe pumps; or kidney dialysis machines.
Another example of a sensor application in the medical field is a simple centrifuge for preparing samples. Sensors are used to help control small motors, making them quieter and more reliable.
The switch is also a prominent application and is used in medicine cabinets that can be operated safely, or in bed adjustments and hearing aids. In the field of hearing aids, the giant magnetoresistive sensor IC (GMR) competes with Hall and reed switches.
Major producer
Major semiconductor suppliers of Hall-effect ICs include Japan's Asahi Kasei Microsystems of Japan, USA's Allegro MicroSystems (belonging to Sanken), Belgium's Melexis NV, Switzerland's Micronas and LEM. These vendors typically offer stand-alone ICs in plastic packages for commutation and position switches, as well as current sensing.
Hall-effect elements with amplifiers or Hall ICs are also part of open-loop or closed-loop current sensors, and manufacturers that produce these sensors include LEM, Swedish ABB, British Telco, and Japan's Tamura and Kohshin. In this supplier camp, the German Vacuumschmeize is a major supplier of non-Hall current sensing, which uses magnetic induction.
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