Pulsed torque, force or general measurement with a coil and...

G - Physics – 01 – D

Patent

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Details

G01D 5/12 (2006.01) G01B 7/00 (2006.01) G01D 5/14 (2006.01) G01D 5/20 (2006.01) G01L 3/10 (2006.01)

Patent

CA 2476543

A method of measuring torque in a part, for example a shaft, (210) in which at least one coil, (212) wound about an axis of the part about which axis torque is applied, is A.C. energised to create an alternating polarity magnetic field in the part, which field emanates a component dependent on torque. A magnetic field sensor arrangement (218) is responsive to the emanated component to produce a torque-indicating signal. The at least one coil is energised (220) by a series of energising pulses of current of alternating polarity which pulses have a relatively small duty cycle. The sensor arrangement produces sensor pulses of alternating polarity corresponding to said energising pulses, and the sensor pulses are measured in a peak-to-peak fashion to produce an output signal representing torque.

L'invention concerne un procédé de mesure d'un couple dans une pièce, par exemple un arbre (210), dans lequel au moins une bobine (212) enroulée autour d'un axe de la pièce autour duquel est appliqué un couple, est excitée par courant alternatif de manière à créer un champ magnétique à polarité alternée dans la pièce, ledit champ générant une composante dépendant du couple. Un dispositif (218) à capteur de champ magnétique sensible à ladite composante génère un signal indicateur de couple. Ladite bobine est excitée (220) par une série d'impulsions de courant d'excitation à polarité alternée, lesdites impulsions présentant un taux d'impulsions relativement faible. Le dispositif à capteur génère des impulsions de capteur à polarité alternée correspondant auxdites impulsions d'excitation, et les impulsions du capteur sont mesurées de crête à crête pour générer un signal de sortie représentant le couple.

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