EGE switch German EGE model EGE price

EGE switch is a device that converts magnetic signals into electrical signals. By utilizing the transformation relationship between magnetic quantities and other physical quantities, with the magnetic field as the medium, it can also convert other non-electrical physical quantity signals into electrical signals. There are two driving methods: one is driven by a permanent magnet, and the other is driven by an electromagnetic coil. The former is mostly used for detection; for example, if a moving part is made of a magnet, once it approaches the magnetic induction switch, it will be attracted and emit a signal. The latter is mostly used for control; if the electromagnetic coil is energized, the contacts will be attracted. Replacing limit switches that rely on collision contact with magnetic induction switches can improve system reliability and service life; therefore, it is often used in programmable logic controllers as a signaling device for position arrival.

EGE switch working principle

The magnetic induction switch is a contact switch; its structural schematic is shown in the figure. It consists of two alloy reeds with high magnetic permeability and low coercivity, sealed in a glass tube filled with inert gas. A certain overlap and appropriate gap are maintained between the two reeds, with gold-plated ends serving as contacts, and lead wires welded outside the tube. When the magnetic induction intensity at the switch's location is sufficiently strong, the two reeds attract each other, causing the contacts to conduct; when the magnetic field weakens to a certain extent, they release under the elastic force of the reeds themselves. When the magnetic induction switch is driven by a permanent magnet, it is mostly used for detection, such as serving as a limit switch to replace limit switches that rely on collision contact, thereby improving system reliability and service life. In PLC controllers, it is often used as a communication signal for position control.

EGE switch precautions

The voltage generally used for DC magnetic induction switches is 3~30V DC, and the typical application voltage range is generally 5~24V DC. Excessively high voltage causes internal component temperature rise, making the switch unstable, while excessively low voltage makes the circuit susceptible to misoperation due to external temperature changes affecting magnetic field strength characteristics. When using a Hall switch to drive an inductive load, please connect a freewheeling diode in parallel across the load terminals; otherwise, transient high-voltage pulses during long-term operation of the inductive load will affect the service life of the Hall switch. To ensure no accidents occur, please check whether the wiring is correct and verify that the voltage is the rated value before powering on.

EGE switch applications

1) Motor industry: Brushless motors offer a series of advantages, including compact size, light weight, high efficiency, convenient speed regulation, low maintenance, long service life, and no electromagnetic interference, with annual demand reaching hundreds of millions. In brushless motors, magnetic switches serve as rotor magnetic pole position sensors and stator armature current commutators. Many magnetic switches, such as Hall devices, Wiegand devices, and magnetoresistive devices, can be used, but Hall devices are the most widely used. Rotational encoders are used for motor speed detection and control; optical encoders were commonly used in the past. Magnetic encoders are showing increasing advantages and are gradually replacing optical devices. Magnetic switches can also be used for motor overload protection (mainly using Hall current switches) and torque detection. 2) Power electronics technology: Power electronics technology combines power technology and electronic technology, enabling mutual conversion between AC and DC currents, and allowing free regulation of current, voltage, and frequency within required ranges. Using these technologies and products, various special power supplies (such as UPS, high-frequency power supplies, switching power supplies, arc welder inverter power supplies, etc.) and AC variable frequency drives (AC VFDs are used for motor speed control, offering excellent energy-saving effects) can be manufactured. The core of these conversion devices is high-power semiconductor devices. Various current switches based on magnetic switches are used to monitor, control, and protect these high-power devices. Hall current switches feature fast response speeds and rely on magnetic field coupling with the controlled circuit without connecting to the main circuit, resulting in low power consumption, strong overload resistance, good linearity, and high reliability. They can serve both as overcurrent protection drivers for high-power devices and as feedback components, becoming a control link in automatic control loops. Conversion technology enables significant energy savings; abroad, 95% of electrical energy is processed through conversion. Although conversion technology has received high attention domestically, only 5% of electrical energy undergoes this transformation, indicating huge application potential. This represents another major industrial application area likely to absorb a large volume of current switches. 3) Energy management: Automatic grid monitoring systems need to collect large amounts of data, which is processed by computers to monitor grid operating conditions, perform load distribution adjustments, and ensure safety protection. Each control link in automatic monitoring systems can be implemented using current switches and transformers based on magnetic switches. Hall current switches are gradually being applied in grid systems. Electricity meters made with Hall devices have shifted from research and development to practical application; they can automatically calculate fees and display power factor for timely adjustment, ensuring efficient power usage. 4) Machine technology and information read/write heads: In addition to magnetic tapes and disks, magnetic information recording devices include magnetic cards, magnetic ink record ledgers, and magnetic records on banknotes, creating huge demand for magnetic information storage and readout switches. Inductive heads, thin-film magnetoresistive heads, and amorphous heads are widely used. As recording density increases, for example to 100G bytes, heads with higher sensitivity and spatial resolution are required. Giant magnetoresistive heads based on multilayer metal films, amorphous alloy heads made from amorphous alloy wires, and giant magneto-impedance heads are competing intensely. 5) Automotive industry: A large number of motors are used in automobiles (advanced cars require approximately 40 to 60 motors per vehicle, while standard cars have 15 motors, showing a trend toward brushless designs). The extensive use of magnetic switches in these applications is self-evident. Another major application area for magnetic switches is the automotive ABS system (Anti-lock Braking System), where each car uses an average of 4 to 6 speed switches, primarily inductive speed switches. New types of Hall gear switches, as well as Wiegand devices, amorphous devices, and magnetoresistive devices, are gradually being promoted and are entering this field. Additionally, speed switches and igniters for engine ignition timing mainly use inductive switches. Hall gear switches and Hall plate switches are already used in some car models. According to Honeywell, by June 6, 1996, they had supplied 8000 ten thousand Hall vane switches and 300 ten thousand Hall gear speed switches to the automotive industry. It is predicted that in the future, more than 30 magnetic switches similar to Hall switches will be adopted in a single vehicle. Furthermore, in fields such as industrial automatic control, robotics, office automation, home appliances, and various security systems, in addition to the widespread use of brushless DC motors and AC variable frequency drives, a large number of magnetic temperature controllers are used in devices such as refrigerators, air conditioners, and rice cookers. By the mid-80s, the quantity exceeded hundreds of millions.

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