DYNAMIC FORCE CONTACTOR, PROVIDING A DYNAMIC FORCE, AND CALIBRATING A FORCE SENSOR TO BE TRACEABLE TO THE INTERNATIONAL SYSTEM OF UNITS

• US 20190078945A1
• Filed: 09/13/2018
• Published: 03/14/2019
• Est. Priority Date: 09/13/2017
• Status: Active Grant

• Current Assignee: THE GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE
• Original Assignee: THE GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE
• Inventors: Chijioke, Akobuije D., Vlajic, Nicholas
• Granted Patent: US 10,641,663 B2
• Time in Patent Office: Days
• CPC Class Codes: G01L 1/122 by using permanent magnets
• CPC Class Codes: G01L 25/00 Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
• CPC Class Codes: H01F 7/064 Circuit arrangements for actuating electromagnets circuit arrangements for obtaining special operating characteristics H01F7/18; driving circuits for electromagnets making use of a switching regulator H01H47/325
• CPC Class Codes: H01F 7/066 Electromagnets with movable winding
• CPC Class Codes: H01F 7/081 Magnetic constructions
• CPC Class Codes: H01F 7/121 Guiding or setting position of armatures, e.g. retaining armatures in their end position
• CPC Class Codes: H01F 7/122 by permanent magnets H01F7/1615, H01F7/1646 take precedence
• CPC Class Codes: H01F 7/1844 Monitoring or fail-safe circuits for relays H01H47/002

Abstract

A dynamic force contactor includes: a magnet that provides a magnetic field; an electrical conductor that provides an electric field perpendicular to the magnetic field, the electric field from the electrical conductor in combination with the magnetic field from the magnet providing a Lorentzian force; an armature disposed proximate to the magnet, the electrical conductor disposed on the armature such that the armature reciprocates in a reciprocating direction relative to the magnet in response to the Lorentzian force and that produces the dynamic force; and a dynamic force mediator in communication with the electrical conductor and the armature such that: the dynamic force mediator monitors an alternating voltage across the electrical conductor; the dynamic force mediator monitors an alternating current through the electrical conductor; and the dynamic force mediator monitors a reciprocation velocity of the armature.

Claims

1. A dynamic force contactor to provide a dynamic force, the dynamic force contactor comprising:

a magnet that provides a magnetic field;

an electrical conductor that communicates an alternating current perpendicular to the magnetic field, the alternating current from the electrical conductor in combination with the magnetic field from the magnet providing a Lorentzian force;

an armature disposed proximate to the magnet, the electrical conductor disposed on the armature such that the armature reciprocates in a reciprocating direction relative to the magnet in response to the Lorentzian force and that produces the dynamic force; and

a dynamic force mediator in communication with the electrical conductor and the armature such that;

the dynamic force mediator monitors an alternating voltage across the electrical conductor;

the dynamic force mediator monitors an alternating current through the electrical conductor; and

the dynamic force mediator monitors a reciprocation velocity of the armature.

2. The dynamic force contactor of claim 1, further comprising a housing on which the magnet, the electrical conductor, the armature, and the dynamic force mediator are disposed.

3. The dynamic force contactor of claim 1, further comprising an accelerometer disposed on the armature.

4. The dynamic force contactor of claim 1, further comprising a light source disposed on the armature or the housing, such that the light source provides light to monitor the reciprocation velocity of the armature.

5. The dynamic force contactor of claim 1, further comprising a light detector disposed on the armature or the housing, such that the light detector receives light from a light source and monitors the reciprocation velocity of the armature.

6. The dynamic force contactor of claim 1, further comprising a secondary electrical conductor disposed opposing the electrical conductor such that the magnet is interposed between the second electrical conductor and the electrical conductor.

7. The dynamic force contactor of claim 6, further comprising a secondary magnet disposed opposing the electrical conductor such that the magnet is interposed between the secondary magnet and the electrical conductor.

8. The dynamic force contactor of claim 7, wherein the secondary magnet is interposed between the magnet and the secondary electrical conductor.

9. The dynamic force contactor of claim 7, wherein the secondary electrical conductor is interposed between the magnet and the secondary magnet.

11. The dynamic force contactor of claim 1, further comprising a magnetic field guide disposed proximate to the magnet and that provides a selected shape of the magnetic field.

12. The dynamic force contactor of claim 1, further comprising an armature guide disposed proximate to the armature and that provides a linear motion in the reciprocating direction of the armature.

13. The dynamic force contactor of claim 1, wherein the dynamic force mediator produces a dynamic force signal based on the reciprocation velocity, the alternating voltage, and the alternating current.

14. The dynamic force contactor of claim 1, wherein the reciprocation velocity, the alternating voltage, and the alternating current are measured to be traceable to the SI.

15. A process for providing a dynamic force, the process comprising:

disposing the armature of the dynamic force contactor of claim 1 in contact with a structure to which the dynamic force is applied;

providing electrical power to the electrical conductor, the electrical power comprising a time-varying amplitude; and

reciprocating the armature at the reciprocation velocity in response to providing electrical power to the electrical conductor to provide the dynamic force to the structure.

16. A process for calibrating a force sensor to be traceable to the international system of units (SI), the process comprising:

disposing the armature of the dynamic force contactor of claim 1 in contact with a structure to which the force sensor under calibration is disposed;

providing electrical power to the electrical conductor, the electrical power comprising a time-varying amplitude;

reciprocating the armature at the reciprocation velocity in response to providing electrical power to the electrical conductor;

providing the dynamic force to the structure;

measuring the alternating voltage;

determining the alternating current through the electrical conductor;

determining the reciprocation velocity of the armature;

determining the dynamic force from the reciprocation velocity, the alternating voltage, and the alternating current; and

determining a calibration response for the force sensor to calibrate the force sensor to be traceable to the SI,

wherein the reciprocation velocity, the alternating voltage, and the alternating current are traceable to the SI.

10. The dynamic force contactor of claim 10, further comprising a coupler in mechanical communication with and interposed between the secondary electrical conductor and the armature.