RU2498244C1 - Device for measurement of moment of resistance due to forces of magnetic friction in non-contact suspensions - Google Patents

Abstract

FIELD: measurement equipment.

SUBSTANCE: device includes a stator and a rotor of axial or radial active electromagnetic bearing; with that, rotor is rotated in bearings by an actuating motor. In addition, it is equipped with additional bearings allowing the stator to be turned about rotation axis and moved along the axis with adjusting screws in the limits of air gaps, and trunnions connected to dynamometers of tension and (or) compression.

EFFECT: simplifying the device and improving measurement accuracy.

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Description

The invention relates to measuring technique and can be used to measure the braking torque from the action of eddy currents and hysteresis in rotor mechanisms on electromagnetic supports.

Known devices that are similar in purpose, for example, for measuring engine torque, including “A method for automatically and continuously changing the torque and speed of the output shaft depending on the resistance to movement and a device for its implementation” (RF patent No. 2398989, F16H 3 / 74 dated 09/10/2010), or “A device for measuring torque on rotating shafts” (RF patent No. 2232355, G01L 1/12, 2006.01), or “Device for measuring torque on a rotating shaft” (application No. 2005133529/28, 10/31/2005).

The closest to the tasks and technical implementation is a device for measuring the torque of electric motors "G. Momentomer Nikulina ”(RF patent No. 2006009, class G01L 3/10, 1994), selected as a prototype, the essence of which is that the device contains two coupling halves connected by elastic elements and mounted on coaxial drive and driven shafts. The coupling halves are kinematically coupled by gearing, one element of which is rigidly connected to one coupling half, and the other is located on the axis of the electric machine angle converter, rigidly fixed to the end of the other coupling half. The torque meter is made in the form of a second electric machine angle converter.

The disadvantage of this device is its complexity and the presence of an electromechanical angle converter, which introduces an additional error in the measurement. In the prototype, the measurement is made not of the moment, but of the angle of movement of the elastic element, which introduces an additional error in the measurement due to the possible nonlinearity of the characteristics of the elastic elements.

The technical result is to simplify the device and improve accuracy, which is achieved due to the fact that the device for measuring the moment of resistance from the forces of "magnetic friction" in non-contact magnetic suspensions, containing a rotor of an axial or radial active electromagnetic bearing, driven by a motor, a stator of an active electromagnetic bearing equipped with additional bearings, allowing it to rotate around the axis of rotation and move along the axis with adjusting screws within air gaps, and trunnions connected to tensile and / or compression dynamometers.

Figure 1 presents a longitudinal section of the device on the example of an axial active electromagnetic bearing, figure 2 is a side view of it.

The device contains a rotor of an axial active electromagnetic bearing in the form of a disk 1, mounted on a shaft 2, rotating in bearings 6 by an engine 3, and two stator halves, consisting of magnetic circuits 4 and control coils 5. The stator has the ability to rotate in bearings 7 and move in the axial direction adjusting screws 8 within the air gaps δ1 and δ2. On the stator there are trunnions 9 to which tensile and / or compression dynamometers 10 are attached at a distance R from the center of rotation.

The device operates as follows.

The shaft 2 with the disk 1 is rotated by the engine 3 with a frequency ω. A current is applied to one or both control coils 5 of the axial active electromagnetic bearing, which creates a magnetic flux in the gaps δ1 and δ2. Disk 1 rotates in a magnetic field and eddy currents are induced in it and the magnetization reversal of domains occurs. The result is a braking torque M, which, according to Newton’s third law, is transmitted to the stator. The value of this moment is fixed by dynamometers 10.

The device provides the ability to measure the amount of braking torque at various air gaps δ1 and δ2, various rotational speeds and magnetic induction in the disk.

The device can also be used to measure the braking torque from the action of eddy currents and hysteresis in the rotor of active radial electromagnetic bearings.

Claims (1)

Device for measuring the torque resistance from forces "magnetic friction" in a non-contact magnetic suspensions, comprising a rotor of the axial or radial active electromagnetic bearing, driven by a motor, and a stator active electromagnetic bearing, characterized in that the stator is provided with additional bearings allowing it to rotate about an axis rotate and move along the axis with adjusting screws within the air gaps, and pins connected to tensile and / or compression dynamometers.

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