Phoenix switch German Phoenix model Phoenix price

Phoenix switch is a device that converts magnetic signals into electrical signals. Utilizing the transformation relationship between magnetic quantities and other physical quantities, with the magnetic field as a 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, it will attract and emit a signal once it approaches the magnetic induction switch. The latter is mostly used for control; if the electromagnetic coil is energized, the contacts will attract. Using magnetic induction switches to replace limit switches that rely on collision contact can improve system reliability and service life; therefore, they are often used in programmable logic controllers as signaling devices for position arrival.

Phoenix switch structure

It consists of two parts: the scale grating and the grating readhead. The figure on the right shows the structure of the linear encoder. The key part of the grating detection device is the grating readhead, which consists of a light source, condensing lens, index grating, photoelectric elements, and adjustment mechanisms. There are many structural forms of grating readheads, which are divided into direct-receiving readheads (also known as silicon photovoltaic cell readheads, mirror-image readheads, beam-splitter readheads, and metal grating reflective readheads) based on structural characteristics and application scenarios.

Phoenix switch principle

The essence of the grating displacement measurement switch is to measure position using the grating pitch as a standard ruler. High-resolution linear encoders are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating switch systems mostly adopt electronic subdivision methods. When two gratings overlap with a slight inclination angle, Moiré fringes are generated in the direction roughly perpendicular to the grating lines. As the grating moves, the Moiré fringes move up and down accordingly. This converts the measurement of grating pitch into the measurement of the number of Moiré fringes. Within the width of one Moiré fringe, placing 4 photoelectric devices at certain intervals can achieve electronic subdivision and direction judgment functions. For example, for a linear encoder with 50 line pairs/mm, its grating pitch is 0.02mm. If four-fold subdivision is adopted, counting pulses with a resolution of 5μm can be obtained, which has reached a very high precision in general industrial measurement and control. Since displacement is a vector, both its magnitude and direction must be detected, so at least two photoelectric signals with different phases are required. To eliminate common-mode interference, DC components, and even harmonics, differential amplifiers composed of low-drift operational amplifiers are usually used. The 4 photoelectric signals obtained from 4 photosensitive devices are sent to the input terminals of 2 differential amplifiers respectively. The two signals output from the differential amplifiers have a phase difference of π/2. To obtain direction judgment and counting pulses, these two signals need to be shaped, first into square waves with a duty cycle of 1:1. Then, by comparing the phase of the square waves, the movement direction of the linear encoder can be determined. By counting the square wave pulses, the displacement and speed of the linear encoder can be obtained.

Phoenix switch precautions for use

Power must be switched off before plugging or unplugging the grating scale switch and the connector of the digital display unit. Install an external protective cover whenever possible, and promptly remove chips and oil splashed onto the scale to strictly prevent any foreign matter from entering the housing of the grating scale switch. Regularly check whether the mounting and connection screws are loose. To extend the service life of the dust-proof sealing strip, apply a thin, even layer of silicone oil to the strip, taking care not to let it splash onto the glass grating etched surface. To ensure reliable operation of the grating scale switch, clean and wipe the grating scale surface and the index grating surface at regular intervals with an ethanol mixture (each 50%) to keep the glass grating scale surface clean. The grating scale switch must not be subjected to severe vibration or impact, as this may damage the grating scale; if the grating scale breaks, the grating scale switch will fail. Do not disassemble the grating scale switch yourself, and never arbitrarily change the relative spacing between the main grating scale and the secondary grating scale. Doing so may impair the accuracy of the grating scale switch and may also cause relative friction between the main and secondary grating scales, damaging the chrome layer and thus the grating lines, which would render the grating scale unusable. Take care to prevent oil stains and water from contaminating the grating scale surface, as this can disrupt the distribution of the grating lines and cause measurement errors. Avoid operating the grating scale switch in environments with severe corrosive effects, to prevent corrosion of the grating chrome layer and the grating scale surface, which would degrade the quality of the grating scale.

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