Torque generator for measuring bearing startup friction torque

Abstract

The present invention discloses a moment generator for measuring the starting friction moments of bearings. The moment generator consists of moment coil (1), a U-shaped moment iron core (2), a bakelite plate (3), a voltage coil (5), a concave voltage iron core (6) and a housing (7). Two orthogonal power supplies are applied on the voltage coils and the moment coils respectively for generating magnetic fluxes having the same phases as that of the coil current in the concave voltage iron coil and the U-shaped moment iron coil; the orthogonal magnetic fluxes from the two paths are applied on an aluminum disc (4) through the interval simultaneously for generating the induction electromagnetic force perpendicular to the axis of the aluminum disc and generating a moment perpendicular to the axis on the aluminum disc for rotating the aluminum disc in the axis direction; The driving moment of the aluminum disc is directly proportional to the product of the orthogonal magnetic fluxes generated by the coil currents from the two paths, therefore the value of the moment is just the value of the current. The direction of the induction electromagnetic force can be changed by controlling the phase angles of the two orthogonal power supplies to realize that the aluminum disc can be rotated both in the normal direction and the reverse direction, solving the problem of acquiring the signals of the starting friction moment of bearings. The technique can be widely used in bearing manufacturers.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic induction, and in particular relates to a torque generator for measuring the starting friction torque of a bearing. Background technique [0002] At present, domestic instrument manufacturers have stagnated at the level of 30 years ago for the measuring instrument of the starting friction torque of the bearing. Most of the torque generators that drive the starting friction torque of the bearing use a simple method, that is, the C-shaped iron core half of the torque generator is embedded with a short circuit. Wind the coil on the C-shaped iron core, place the half of the aluminum disc in the gap of the C-shaped iron core, and install the aluminum disc on the mandrel connected to the tested bearing. When an alternating current is applied to the C-shaped core coil, an alternating magnetic flux is generated on the notch end face of the C-shaped iron core. Due to the effect of electromagnetic i...

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Problems solved by technology

[0003] 1) It is difficult to do quantitative measurement;

[0004] 2) The single coil structure is determined, and the direction of the force is also fixed accordingly, and the measurement of the positive and negative directions cannot be realized;

[0005] 3) The volume of the coil core is relatively large;

[0006] 4) It is difficult to sample the measurement signal of the bearing starting friction torque

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