公开(公告)号：SE0601249L

公开(公告)日：2007-12-08

申请号：SE0601249

申请日：2006-06-07

Applicant: ABB AB

Inventor： SOBEL JARL ,  NILSSON JAN

Abstract: A method and device are provided for demodulation of an output signal from a transducer (1) driven by an alternating excitation signal having an excitation frequency. The transducer produces an amplitude-modulated output signal (y(t)) containing the quantity to be measured. The device has sampling units (5,6,7) to sample the output signal from the transducer and the output signal from the excitation unit, and a computation unit (8) to compute a first complex valued quantity ( Y) including information on the amplitude and phase of the output signal at the excitation frequency based on sampled values of the output signal from the transducer, compute a second complex valued quantity (Ū, Ī) including information on the amplitude and phase of the excitation signal at the excitation frequency based on sampled values of the excitation signal, forming a complex valued output quotient between the first and second complex valued quantities, and compute the demodulated output signal (Od) based on the output quotient.

公开(公告)号：ES2282099T3

公开(公告)日：2007-10-16

申请号：ES00919227

申请日：2000-03-24

Applicant: ABB AB

Inventor： SOBEL JARL

IPC: G01D5/20 ,  G01L1/12 ,  G01R19/25 ,  G01R35/00 ,  H03M1/12 ,  H03M3/02

Abstract: Un método para procesar señales desde un transductor excitado por una señal de excitación de corriente alterna, cuyo transductor produce como salida una señal modulada en amplitud que contiene la cantidad a medir, caracterizado por las etapas de generar una primera señal de reloj de frecuencia n.f para el muestreo de la señal del transductor y sincronizada con dicha señal de excitación, generar una segunda señal de reloj de frecuencia f sincronizada con la señal de excitación, muestrear la señal de salida del transductor a una frecuencia n.f controlada por dicha señal primera de reloj, producir promedios de medio periodo por medio de computar un promedio ponderado de n/2 muestras de la señal de salida de corriente alterna del transductor, estando el punto de arranque de dicho promediado en sincronismo con dicha señal de reloj segunda, obteniendo por consiguiente una reducción de valores de medición correspondientes a un muestreo óptimo a 2f, rectificar en un modo sensible a la fase y demodular la señal del transductor muestreada cambiando alternativamente el signo de los promedios de medio periodo de acuerdo con el valor lógico de la segunda señal de reloj.

公开(公告)号：DE69528201T2

公开(公告)日：2003-05-08

申请号：DE69528201

申请日：1995-11-28

Applicant: ABB AB VAESTERAAS

Inventor： BEIJBOM JAN ,  SOBEL JARL

IPC: G01L5/04 ,  B21B38/06 ,  B65H23/04 ,  B65H23/188 ,  G01L5/10 ,  G01L5/108 ,  B65H26/04

Abstract: PCT No. PCT/SE95/01422 Sec. 371 Date May 16, 1997 Sec. 102(e) Date May 16, 1997 PCT Filed Nov. 28, 1995 PCT Pub. No. WO96/17233 PCT Pub. Date Jun. 6, 1996The present invention relates to a method and a device for two-shaft force measurement and its application to the determination of tensile force in a continuous web. The device comprises a force-introducing part (4) with two force-measuring parts A and B for determining the forces FA and FB, and the force is applied in a torque-free manner around a center of force via a device (3), for example in the form of a deflector roll journalled in bearing brackets (3) placed on the force-introducing part, and wherein the force-measuring parts, due to their built-in design, measure forces FA and FB in directions directed through angles +/- phi from a mean measurement direction, and wherein the force-measuring parts A and B are placed at the same distance L on different sides of a plane parallel to the mean measurement direction and through said center of force, and wherein the force-measuring parts A and B are placed at a distance h on the same side of a plane perpendicular to the mean measurement direction and through said center of force (FIG. 2).

公开(公告)号：SE0003441L

公开(公告)日：2002-03-28

申请号：SE0003441

申请日：2000-09-27

Applicant: ABB AB

Inventor： SHAHCHERAGHI ROOZBEH ,  SOBEL JARL ,  BLOMKVIST KENT ,  LING HANS

IPC: G01L3/10

Abstract: A torque transducer for measuring torque transmitted in a rotating as well as a stationary shaft. The torque transducer comprises a transducer shaft 1 arranged with a cylinder-shaped magnetoelastic region 2 fixed to the cylindrical periphery of the transducer shaft, which cylinder-shaped magnetoelastic region is permanently magnetized in the azimuthal direction. The transducer shaft with the cylinder-shaped magnetoelastic region is surrounded by a winding 4 which is supplied by an alternating current. Further, the winding is connected to a phase-sensitive detector 5. According to the present invention, a magnetic and non-linear ferromagnetic material 3' is arranged in physical contact with the cylinder-shaped magnetoelastic region 2. The advantages are that the transducer shaft is manufactured independently of the magnetic properties of the shaft material and may substantially consist of a ferromagnetic material.

公开(公告)号：ES2154334T3

公开(公告)日：2001-04-01

申请号：ES95914624

申请日：1995-03-22

Applicant: ABB AB

Inventor： LING HANS ,  SOBEL JARL ,  UGGLA DAN J

IPC: G01L1/12 ,  G01L3/10

Abstract: PCT No. PCT/SE95/00289 Sec. 371 Date Sep. 4, 1996 Sec. 102(e) Date Sep. 4, 1996 PCT Filed Mar. 22, 1995 PCT Pub. No. WO95/27191 PCT Pub. Date Oct. 12, 1995A magnetoelastic torque transducer for measuring, in a non-contacting manner, the torque in a stationary or a rotating shaft. The transducer comprises a shaft (1) with surrounding excitation windings (2, 3) and measuring windings (10, 11). Concentrically with the windings, anisotropic measuring zones are created by applying layers (8, 9), for example in the form of copper strips, on the surface of the shaft. The angle between the strips and a generatrix to the cylinder surface of the transducer shaft is in a preferred embodiment chosen to be +/-45 DEG (FIG. 5).

公开(公告)号：SE513954C2

公开(公告)日：2000-12-04

申请号：SE9901199

申请日：1999-04-01

Applicant: ABB AB

Inventor： SOBEL JARL

IPC: G01D5/20 ,  G01R19/25 ,  G01R35/00 ,  H03M1/12 ,  H03M3/02 ,  G01L1/12

Abstract: A method and a system for phase sensitive rectification of signals from transducers driven by an AC excitation signal will be disclosed. The method and system demand a very moderate calculation capacity, thereby to facilitate the use of low cost microprocessors of ordinary speed. The present method and system utilize a sampling being synchronized with the transducer excitation frequency f. Sampling of the sensor signal is performed by an A/D-converter at a high sampling frequency, nf. The sampled signal then is averaged over half a period of the excitation signal frequency, whereby the starting point of the averaging is decided by the time of commutation. This is equal to filtering the sampled signal by a decimating filter. The rectification may then may be preformed with a number sequence sampled by the optimal sampling frequency 2f (twice the excitation frequency only) instead of the sampling frequency nf used for obtaining high resolution. The output then is further filtered by means of a digital filter acting as an ideal low-pass filter as well as an output filter for achieving a desired output signal level. The signal output will be then be simply made available for further digital processing. However, the output still offers high resolution measurements in spite of only demanding moderate speed microprocessor capacity for the processing.