A magnetostrictive-type sensor temperature-detecting circuit configured to be used in a magnetostrictive-type sensor including an applied stress-detecting coil, and a driving section to output an alternating voltage, excite the coil with a resulting alternating electric current, and switch flow directions of the electric current flowing in the coil in response to switching voltage polarities of the output alternating voltage, to detect a temperature of the coil in the sensor. This temperature-detecting circuit includes an alternating electric current direction switching time-detecting section to detect an amount of time from when the voltage polarities of the output alternating voltage are switched until when the flow directions of the electric current flowing in the coil are switched, and a temperature-computing section to compute the temperature of the coil on the basis of the amount of time detected by the alternating electric current direction switching time-detecting section.

An electromechanical chassis actuator, for example an actuator of a roll stabilizer, for a motor vehicle has a torque measuring arrangement based on the inverse magnetostrictive principle. At least one electronic unit has a printed circuit board which is connected at least indirectly to an actuator housing through a rivet connection.

Provided are a magnetostrictive torque sensor shaft with excellent processing accuracy and stability of quality and a preferred method for manufacturing the shaft. The magnetostrictive torque sensor shaft has an amorphous thermal spray coating on the surface of a substrate made of a metal material, the amorphous thermal spray coating having a magnetostrictive property and being formed by thermal spraying, and the substrate surface being subjected to surface roughening by laser irradiation. The laser irradiation is performed in the surface roughening process prior to the amorphous thermal spraying and in pattern formation process after the thermal spraying.

A sensor for sensing stress in a ferromagnetic material includes a non-magnetic substrate. The substrate has a first surface and a second surface opposite the first surface. A first coil is attached to or formed on the first surface of the substrate. The first coil is configured to induce a magnetic flux in the ferromagnetic material being driven by an alternating current (AC) signal. At least one second coil is attached to or formed on the first surface of the substrate. The at least one second coil is spaced from the first coil. In addition, the second coil is configured to detect changes in the magnetic flux induced in the ferromagnetic material.

A torque sensor is provided. The torque sensor includes a shaft configured to receive an applied torque. The shaft includes a first region and a second region, both regions being magnetoelastic. The first region and the second region generate a first magnetic field and a second magnetic field in response to the applied torque. The shaft also includes a third region disposed between the first region and the second region. The third region generates a substantially negligible magnetic field in response to the applied torque. The torque sensor also includes a first sensor disposed adjacent to the first region, a second sensor disposed adjacent to the second region, and a third sensor disposed adjacent the third region. The first sensor senses the first magnetic field, the second sensor senses the second magnetic field, and the third sensor senses an ambient magnetic field.

A torque sensor assembly including a shaft configured to receive an applied torque. The shaft includes at least one region being magnetoelastic and configured to generate a magnetic field in response to the applied torque. A plurality of sensors, circumferentially positioned around the at least one region, configured to generate a plurality of signals that are indicative of the magnetic field. Each of the plurality of signals includes multiple harmonic components. A controller is connected with the plurality of sensors and being configured to receive the plurality of signals and determine (i) an average of the plurality of signals in order to cancel at least one of the harmonic components of the multiple harmonic components for each of the plurality of signals, and (ii) a magnitude of the applied torque based on the average of the plurality of signals.

A coil arrangement has a first cylindrical coil having a first winding direction and a second cylindrical coil having a second winding direction. The first and second cylindrical coils are arranged in longitudinal succession aligned on a common axis. Mutually adjacent ends of the first and second cylindrical coils are electrically connected to each other, and the second winding direction is opposed to the first winding direction.

A method of manufacturing a coil for a torque sensor includes: holding a bobbin with a jig, the bobbin being formed in a cylindrical shape and provided with first inclined grooves and second inclined grooves on a cylindrical outer peripheral surface of the bobbin, the first inclined grooves being inclined at a preset specified angle with respect to an axial direction of the cylindrical shape, and the second inclined grooves being inclined at the specified angle with respect to the axial direction in a direction opposite to the first inclined grooves; and rotating the bobbin while simultaneously supplying insulated wires from nozzles arranged to surround the bobbin, and driving the nozzles in a direction orthogonal to a rotation direction of the bobbin so as to wind the insulated wires around the bobbin along the first inclined grooves or the second inclined grooves.

An impact tool includes a motor, an output block, a hammer, and a magnetostrictive sensor. The magnetostrictive sensor includes a magnetostrictive member and a coil portion covering the magnetostrictive member. The output block includes a claw block and a body block. The claw block includes an anvil claw, against which a hammer claw collides. The claw block has been subjected to quenching treatment. The body block includes a thermally sprayed portion and is coupled to the claw block. The thermally sprayed portion includes, on a surface thereof, the magnetostrictive member made of a magnetostrictive material.

A torque sensor including a shaft that receives an applied torque is disclosed. The shaft includes a magnetoelastic region that generates a non-negligible magnetic field responsive to the applied torque and one or more null regions that each generates a negligible magnetic field. The torque sensor includes a plurality of null region sensors proximal a null region that generate a null region magnetic field measure corresponding to a magnitude of an ambient magnetic field. The torque sensor includes a magnetoelastic region sensor proximal the magnetoelastic region that generates a magnetoelastic region magnetic field measure corresponding to the magnitude of the ambient magnetic field and a magnitude of the non-negligible magnetic field. The torque sensor includes a controller coupled to the null region sensors and the magnetoelastic region sensor that calculates a magnitude of the applied torque based on the null region magnetic field measures and the magnetoelastic region magnetic field measure.