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CN-121977743-A - Dynamic torque standard device based on electromagnetic force and measuring method thereof

CN121977743ACN 121977743 ACN121977743 ACN 121977743ACN-121977743-A

Abstract

A dynamic torque standard device based on electromagnetic force principle and a measuring method thereof are used for realizing the generation and calibration of dynamic and static torque values based on electromagnetic force. The device generates adjustable electromagnetic torque by constructing a stable magnetic field environment and utilizing the electromagnetic action between an electrified coil and a magnetic field under the condition of a fixed shafting structure, and establishes a quantitative relation between torque and electric quantity by synchronously measuring electric and motion parameters such as voltage, rotation angular velocity and the like, thereby realizing the generation and measurement of dynamic torque magnitude by controlling programmable current.

Inventors

  • FU JIAHAO
  • BAI YANG
  • WU SHI
  • MENG CHEN

Assignees

  • 中国计量科学研究院

Dates

Publication Date
20260505
Application Date
20260313

Claims (9)

  1. 1. The electromagnetic force-based dynamic torque standard device is characterized by comprising a rotary driving system (1), an electromagnetic torque generating system (2), a rotary shaft system (3), an angle measuring system (4), an electrical measuring system (5) and a control and data acquisition system (6), wherein the electromagnetic torque generating system (2) comprises a magnet array and a coil assembly, the magnet array comprises a magnet (2-1), a magnet yoke (2-2), a fixed ring (2-3) and a magnetic hoop (2-4), the electrical measuring system (5) comprises an alternating current source (5-1) and a high-precision voltmeter (5-2), and the coil assembly comprises a coil (2-5) and a coil disc (2-6); The system is coaxially arranged, the rotary driving system (1) is mechanically connected with the rotary shaft system (3), the electromagnetic torque generating system (2) is sleeved outside the rotary shaft system (3), the angle measuring system (4) is connected with the end part of the rotary shaft system (3), the electric measuring system (5) is electrically connected with the electromagnetic torque generating system (2), and the control and data acquisition system (6) is electrically connected with all other systems; The rotary driving system is used for providing adjustable stable angular speed and driving the rotary shaft system to operate so as to establish a quantitative relation between the electric quantity and the torque quantity; the coil assembly is arranged in a magnetic field area formed by the magnet array, and when current is input to the coil, the coil generates electromagnetic force in the magnetic field and forms electromagnetic torque acting on the rotating shaft system; The rotating shaft system is used for connecting a calibrated torque sensor or a loading mechanism and transmitting the electromagnetic torque; the angle measurement system is used for measuring the rotation angle and the angular speed and outputting a high-resolution angle signal; the electrical measurement system is used for controlling the input current of the coil and measuring the output voltage of the coil; the control and data acquisition system is used for realizing synchronous acquisition of rotation control, current control and electric quantity and angle signals; The dynamic torque is obtained by establishing a relation between mechanical power and electric power, and the calculated relation is as follows: Wherein T is the torque generated; -rotational angular velocity; u-coil output voltage; I-the drive current of the input coil; -coil rotation angle; The diagonal positions are uniformly sampled in a complete rotation period, and m groups of measurement data { are obtained -Calculating the corresponding ratio The ratio is then statistically averaged and plotted simultaneously And angular position An angle section with good magnetic field uniformity is determined according to the curve change condition, and the section is used as a coil preferential power-on area.
  2. 2. The electromagnetic force-based dynamic torque calibration apparatus as set forth in claim 1, wherein the magnet array is composed of a plurality of permanent magnets arranged in a circumferential direction to form a multipole magnetic field structure, the magnet array is divided into an upper part and a lower part, the upper and lower magnets are arranged oppositely in an axial direction to form N-S pole alignment structures of adjacent magnets, thereby forming a stable magnetic gap magnetic field region between the two sets of magnets.
  3. 3. The dynamic torque calibration device of claim 2, wherein said coil assembly is disposed in said magnetic gap field region and maintains a fixed relative position with respect to the rotating shaft system to reduce the effect of magnetic field variations on torque measurements.
  4. 4. The dynamic torque calibration device according to claim 1, wherein the rotating shaft system comprises a high-rigidity rotating shaft structure and a bearing support structure for reducing the influence of axial vibration and radial vibration on dynamic torque measurement.
  5. 5. The dynamic torque calibration device according to claim 1, wherein the angle measurement system comprises a circular grating encoder and at least two reading heads, and the reading heads adopt an orthogonal arrangement mode and are used for improving the angle measurement precision and inhibiting the shafting eccentric error.
  6. 6. The dynamic torque calibration device of claim 1, wherein the electrical measurement system comprises a programmable alternating current source and a high precision voltage measurement unit for current input waveform control and voltage signal measurement.
  7. 7. A dynamic torque measuring method using the electromagnetic force-based dynamic torque measuring device as recited in any one of claims 1 to 6, comprising the steps of: (1) Establishing an electromagnetic torque generating system, and adjusting a rotary driving system to enable the device to reach a set running state; (2) Acquiring a rotation angle signal and calculating the angular velocity through an angle measurement system, measuring the output voltage of a coil, and establishing a relation between an electrical quantity and the angular velocity; (3) Determining a proportional relation parameter according to a system measurement result; (4) Inputting control current to the coil according to a preset dynamic working condition, so that the coil generates electromagnetic acting force in a magnetic field and forms dynamic torque; (5) Synchronously acquiring data through an electrical measurement system and an angle measurement system, and calculating dynamic torque according to the electrical quantity; (6) And collecting output signals of the calibrated torque sensor, and completing dynamic torque calibration through an comparison method.
  8. 8. The method for measuring dynamic torque of a dynamic torque measuring device based on electromagnetic force as set forth in claim 7, wherein the input current is a programmable periodic signal comprising a sine wave, a current step or a multi-frequency superimposed signal.
  9. 9. The method of claim 7, wherein the accuracy of the dynamic torque measurement is improved by synchronously detecting the voltage and angular velocity signals, controlling the output signal of the current detecting sensor, and performing time synchronization.

Description

Dynamic torque standard device based on electromagnetic force and measuring method thereof Technical Field The invention relates to the technical field of mechanical measurement and precise measurement, in particular to a device for realizing dynamic torque generation and calibration based on an electromagnetic force principle and a measurement method thereof, which are suitable for measuring and calibrating dynamic/static torque values. Background Torque is an important physical quantity describing the torsion state of the system, and plays an important role in aerospace execution mechanisms, robot joint driving systems, automobile power transmission systems and precision electromechanical equipment. Under actual operating conditions, torque generally varies with time, load and operating conditions, with dynamic characteristics directly affecting system control accuracy, operating stability and safety. Therefore, the development of accurate measurement and calibration of dynamic torque is of great importance. Dynamic torque sensors widely used in current engineering still mostly rely on static or quasi-static torque standard devices for calibration. The calibration device generally establishes a torque value based on a force arm and weight loading mode, a measurement basis of the calibration device mainly comes from parameters such as mass, gravity acceleration, geometric dimension and the like, and torque tracing is realized through force value conversion. The method can obtain higher measurement accuracy under static conditions, but under dynamic loading conditions, the dynamic response characteristic of the sensor when the torque changes along with time is difficult to reflect, so that accurate evaluation of a dynamic torque measurement result is limited. Some research institutions developed dynamic torque calibration devices based on the principle of inertia. The device generally generates angular acceleration through a rotary system, and utilizes rotational inertia to realize loading and measurement of dynamic torque. However, such methods require a rotational motion to form a dynamic torque, and the system structure is complex, and the requirements for rotational stability, mechanical vibration and shafting dynamics are high. Meanwhile, the magnitude basis of the device is still derived from the equivalent value transmission link of the mass, the geometric dimension and the inertia parameter, and the whole device still belongs to an indirect tracing mode based on a mass magnitude system. With redefinition of international system of units (SI) in 2019, kilograms are no longer dependent on physical references, but are defined by fixing planck constants, and a new technical path is provided for realizing direct traceability of mechanical quantities by using an electromagnetic method. Under the background, the traditional technical route for realizing torque magnitude transmission by depending on a mass system still has a certain limitation in realizing direct association with a new SI system, and a dynamic torque metering method capable of establishing a relation between mechanical power and electric power and realizing direct association of electric quantity is not yet available. Therefore, the patent provides a dynamic torque standard device based on electromagnetic force and a measuring method thereof, and the direct association of the dynamic torque magnitude and a new SI system is realized by establishing a quantitative relation between the torque magnitude and the electrical quantity, so that the stability, the repeatability and the metering traceability of the dynamic torque calibration process are improved. Disclosure of Invention The invention aims to provide a dynamic torque standard device based on electromagnetic force and a measuring method thereof, and the invention constructs a magnetic field system, a conductor coil assembly and a high-precision angle measuring system, and under the condition of a fixed shafting structure, an adjustable loading moment is generated by utilizing electromagnetic force to form dynamic torque output. Meanwhile, through synchronously measuring current, voltage and angular displacement or micro angular vibration, the correlation calculation between the dynamic torque and the electric quantity is realized, so that the dynamic torque standard is established. The invention aims at realizing the following technical scheme: a dynamic torque standard device based on electromagnetic force comprises a rotary driving system, an electromagnetic torque generating system, a rotary shaft system, an angle measuring system, an electrical measuring system and a control and data acquisition system. The torque and electrical quantity relationship generated by the design is as follows: Wherein T is the torque generated; -rotational angular velocity; u-coil output voltage; I-the drive current of the input coil; -coil rotation angle; By measuring The resulting torque can be accurat