DEVICE FOR EXAMINATION OF MAGNETIC FORCE INTERACTION Russian patent published in 2011 - IPC G01R33/00 

FIELD: electricity.

SUBSTANCE: measuring disc coil is fixed at non-magnetic, for example, dielectric lever rotating at synchronous motor axis. Coil outputs are connected to input of low-noise alternating-current amplifier through current collectors with sliding brushes installed at synchronous motor axis. At the plane of rotation of disc coil there installed is direct electromagnet with magnetisation winding, longitudinal magnetic axis of which coincides with tangent line to the said rotation circle of disc coil. Electromagnet winding is connected to alternator of elevated frequency (in the range of 1-10 kHz) via power amplifier regulated by amplitude. The second output of alternator is connected to reference signal input of phase-sensitive rectifier, the signal input of which is connected to the output of low-noise alternating-current amplifier and the output of phase-sensitive rectifier is connected to integrating unit input. Integrating unit output is connected to the first input of recording device, the second input of which is connected to one of the phases of three-phase generator with adjustable frequency connected to the windings of synchronous motor. Recording device control output is connected with integrating unit reset input. Note that the plane of disc coil location and non-magnetic lever fixed at it are in one plane, orthogonal to plane of rotation, and disc coil centre is aligned with trajectory of its movement by circle.

EFFECT: increase of accuracy of performed measurements of interaction power increment at ferromagnetic body rotation in magnetic field of direct permanent magnets.

1 dwg