parker switch German parker model parker price

parker switches are components that convert changes in non-electrical quantities (such as speed, pressure) into changes in electrical quantities. Depending on the non-electrical quantity converted, they can be classified as pressure switches, speed switches, temperature switches, etc., and serve as parts and accessories for measurement, control instruments, and equipment.

parker switch operating 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 the ends gold-plated as contacts and leads soldered outside the tube. When the magnetic induction intensity at the switch's location is sufficiently strong, the two reeds attract each other, closing the contacts; when the magnetic field weakens to a certain extent, the reeds release under their own elastic force. Magnetic induction switches are often used for detection when driven by permanent magnets, such as limit switches, replacing travel switches that rely on collision contact, thereby improving system reliability and service life. They are commonly used in PLC controllers as communication signals for position control.

parker switch precautions

The voltage used for DC magnetic induction switches is generally 3~30V DC, with a typical application voltage range of 5~24V DC. Excessively high voltage causes internal component temperature rise, making the switch unstable, while excessively low voltage makes the magnetic field strength characteristics susceptible to external temperature changes, leading to circuit malfunction. When using Hall switches to drive inductive loads, 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.

parker 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 (VFDs) can be manufactured (AC VFDs are used for motor speed control and offer excellent energy-saving effects). 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. Using conversion technology can save significant amounts of energy; 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 prospects. Among these, the potential absorption of a large number of current switches represents another huge industrial application area for magnetic switches. 3) Energy management: The automatic detection system of the power grid needs to collect large amounts of data. After computer processing, it monitors the operating status of the power grid and performs load distribution adjustment and safety protection. Each control link of the automatic monitoring system can be implemented using current switches and transformers based on magnetic switches. Hall current switches are gradually being applied in power grid systems. Electricity meters made with Hall devices have shifted from research and development to practical application; they can automatically bill and display the power factor for timely adjustment, ensuring efficient electricity usage. 4) Mechanical technology and information read/write heads: In addition to magnetic tapes and disks, magnetic information recording devices include magnetic cards, magnetic ink record books, and magnetic records on banknotes, creating huge demand for magnetic information storage and readout switches. Inductive heads, thin-film magnetoresistive heads, and amorphous heads have been widely used. With the increase in recording density, for example up 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 engaging in intense competition. 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 towards brushless designs). The extensive use of magnetic switches in these motors is self-evident. Another area with significant use of 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, which are gradually being promoted, as well as Wiegand devices, amorphous devices, and magnetoresistive devices, are entering this field. Additionally, speed switches and igniters for ignition timing in automobile engine systems 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 car. 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 number exceeded hundreds of millions.

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