Combination balanced type standard device

Abstract

A combination balanced type standard device solves the technical problems of the device such as sensitivity, stability and accuracy, and the like. The technical scheme is that a set of front electromagnetic force generators is arranged on a standard beam; a set of back electromagnetic force generators is arranged on a balanced beam; and the front and back electromagnetic force generators are respectively connected with a detected sensor and a control resolving system. The device of the invention is fit for a tiny torsion standard device, particularity for a mNm level tiny range torsion standard device.

Description

Technical field: [0001] The invention relates to the testing and calibration of an instrument for measuring torque, in particular to a torque standard device. Background technique: [0002] In the fields of industry, transportation, national defense, etc., transmission devices are widely used in various power machinery and working machinery, so torque measuring devices and torque sensors are widely used. The implementation, acceptance, regular inspection and calibration of these torque measuring devices and sensors require The torque standard device whose accuracy is one level higher than that is used to transmit the value. The existing torque devices above are all loaded with weights to verify and calibrate the torque sensor. The basic principle is: the random balance principle of the mechanical balance and the torque The combination of the principle of dual balance, in which the theory of casual balance is the basic theory of mechanical balance, the sensitivity of the beam...

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of science and technology, micro-motors are widely used in technical fields such as inertial navigation, self-guidance and automatic control systems, so micro-scale torque sensors and small-scale torque sensors for testing micro-motors are widely used. For some torque standard devices, the sensitivity and stability cannot be guaranteed for the small range below 10Nm, especially for the small range of mNm. For this, Germany PTB adopts 101Nm static weight standard torque device (uncertainty 5× 10 -4 ), the device performs step-loaded calibration of the torque sensor, or uses a standard sensor in series with the measured micro torque sensor to perform comparison calibration, but it is not over-standard, and it is difficult to meet the needs of technological development; Torque calibration device, install the rotor on the modified balance, apply current to the rotor coil of the eccentric mass through the hairspring, the eccentric mass deviates from the vertical position to form a force arm, the product of the force arm and the mass block is the torque value, and this torque value leads to The modified balance beam of the balance is tilted, and then loaded with the step method to make the balance beam balanced, so as to calibrate (uncertainty is 1×10 -2 ), it is obvious that this technical solution still cannot meet the needs of the micro-range torque standard device. How to solve this problem, the related technology of precision electromagnetic balance can provide valuable information. Technology and electronic technology are applied to mechanical balances. In the industry of measuring quality, precision electromagnetic balances appear. It is a new technology combining the principle of random balance and electromagnetic force balance, which makes the balance obtain new breakthroughs in the quality measurement industry. Its high stability and sensitivity have been well verified; the principle of electromagnetic force balance is: when the weight of the object to be weighed and the standard weight are unequal and a torque difference occurs, the balance beam tilts to one side, and the differential copper sheet of the displacement sensor Swing along with it, convert the angle of inclination of the balance beam into a change of displacement (arc length), and then the displacement sensor converts the displacement signal into an electrical signal, which is amplified by the displacement amplifier, and then amplified by the summing amplifier, and negatively fed back to the torque device with current , so that the torque device generates torque (that is, the electromagnetic restoring torque), and then the beam is tilted in the opposite direction to realize the balance of the electromagnetic force

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