SU1206910A1 - Electromagnetic vibrator for determining dynamic characteristics of machine tools - Google Patents

Description

The invention relates to electrical engineering, in particular to electromagnetic vibrators, and can be used as a loading and measuring device in determining the dynamic (frequency) characteristics of processing machines and other

machines. I

The purpose of the invention is to improve the accuracy of measuring the force developed by the vibrator.

FIG. 1 shows an electro-magnetic vibrator, a longitudinal section; in fig. 2 is a view along arrow A in FIG. one; in fig. 3 - the same, bottom view

The device contains a U-shaped core consisting of two parts 1 and 2 of the same shape, part 1 being fixed on base 3 and having a greater thickness and weight than part 2. Coils with windings 4 and 5 are placed at the core poles, connecting -1th respectively to the source of AC and DC (sources not shown). The vibrator anchor is made in the form of a mandrel 6, which is the element of the machine being investigated. The parts 1 and 2 of the core are interconnected by elastic t-m plates 7 and 8 located parallel to the axis of the core. The spring plate 7 is installed in the slot of the core above the coils. Another elastic plate 8, having strain gauges 9, is located with a gap relative to the lower plane of the greater part 1 of the core. Such an installation of the plate 8 allows it to move in the direction of the core together with a small part 2 of the core when the force effects the vibrator.

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The vibrator works as follows.

The winding 4 is connected to the source of direct current, and the winding 5 to the source of alternating current. As a result, two constant and variable magnetic fluxes are induced in the core, which in turn create two forces - a constant and a variable, acting on measles 6. Under the action of these forces, a smaller part 2 of the low-mass core moves in the direction of the core 6, which leads to deflection of the elastic plate 8. The deformation of the elastic plate 8 by means of strain gauges 9 is converted into an electrical signal used to measure the force generated by the vibrator.

Due to the high sensitivity of the measuring system, consisting of an elastic plate 8 with strain gauges 9, with small deformations of the plates 8 and the presence of a total magnetic flux for greater 1 and smaller 2 parts of the magnetic circuit, the strength developed by the smaller part of the vibrator 2 magnetic circuit (previously Noah and ottarirovannoy), with a high degree of accuracy, you can determine the force developed by the entire vibrator as a whole.

Thus, the proposed device makes it possible to increase the accuracy of measuring the forces developed by the vibrator, since the measuring system — a part of the low-mass core — the elastic plate has a high natural frequency of oscillation and does not introduce additional errors into the measurement.

1206910

Type A

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eight

Fig.Z

Claims (1)

ELECTROMAGNETIC VIBRATOR for determining the dynamic characteristics of machines, containing a core with windings placed on it and an armature made in the form of a cylinder of magnetically conductive material, characterized in that, in order to increase the accuracy of measuring the force developed by the vibrator, it is equipped with at least one elastic plate with load cells located parallel to the axis of the armature, and the core is made of two U-shaped parts of different thicknesses, located side by side along the axis, and the _Q- plate with strain gauges at one end S it is rigidly connected with a part of the core of a larger thickness, and another with a part of the core of a smaller thickness. SU „„ 1206910