A measuring element that converts the relative displacement between two planar windings into an electrical signal using the principle of electromagnetic induction for a length measuring tool. Inductive synchronizers (commonly known as encoders, grating scales) are divided into two types: linear and rotary. The former consists of a fixed length and a sliding ruler for linear displacement measurement; the latter consists of a stator and a rotor for angular displacement measurement. In 1957, the United States RW Triump and other patents inductive synchronizer in the United States, formerly known as position measurement transformer, inductive synchronizer is its trade name, initially used for radar antenna positioning and automatic tracking, missile guidance. In mechanical manufacturing, inductive synchronizers are often used in digitally controlled machine tools, machining centers and other positioning feedback systems, and in coordinate measuring systems such as coordinate measuring machines and boring machines. It has low requirements on environmental conditions and can work normally in an environment with a small amount of dust and oil mist.
The period of the continuous winding on the fixed length is 2 mm. There are two windings on the slider, the period of which is the same as that on the scale, but they are staggered by 1/4 cycle (electrical phase difference of 90°). The inductive synchronizer works in two ways: phase-detection and amplitude-detection. The former is to input two alternating voltages U1 and U2 with the same phase difference of 90°, frequency and amplitude into the two windings on the slider. According to the principle of electromagnetic induction, the winding on the fixed length generates the induced potential U. If the slider moves relative to the fixed length, the phase of U changes accordingly. After amplification, it is compared with U1 and U2, subdivided and counted, and the displacement of the slider can be obtained. In the amplitude-correcting type, the input slider winding is an AC voltage with the same frequency and phase and different amplitudes. According to the amplitude variation of the input and output voltages, the displacement of the slider can also be obtained. A system consisting of an inductive synchronizer and electronic components such as amplification, shaping, phase contrast, subdivision, counting, display, etc. is called an inductive synchronizer measurement system. It has a length measurement accuracy of 3 microns / 1000 mm and an angular accuracy of 1" / 360 °.
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