Torque detecting apparatus

A torque detecting apparatus comprising rotary members, with magnetic members of a plurality of poles being provided thereon, fitted on both ends of a torsion bar;

• electromagnetic transducer elements disposed to confront said rotary members for detecting a relative displacement of said magnetic members;
• and a signal processing circuit for measuring a torque from a signal detected by said electromagnetic transducer elements, said signal processing circuit comprising a waveform shaping circuit which produces pulses in response to the rotation of the magnetic members of one rotary member on the basis of the signal detected by said electromagnetic transducer elements, a differential voltage detecting circuit which produces a differential voltage from a relative displacement of both rotary members on the basis of the signal detected by said electromagnetic transducer elements, and an arithmetic circuit which evaluates a rotational angle and torque on the basis of signals provided by said circuits.

A torque detecting apparatus for detecting a load torque from a relative angular difference of angles detected by angle detectors fitted at a certain interval on a shaft rotated by a drive source, said apparatus comprising two rotary drums or rotary discs with a plurality of magnetic poles for generating magnetic signals being provided on the surface thereof, and magnetic sensors disposed to confront said surface of said rotary drums or discs, with magnetic resistance effect elements which varies in internal resistance in response to the magnetism of said magnetic poles being provided thereon, a relative angular position of said rotary drums or rotary discs being taken out as a resistance variation of said magnetic resistance effect elements.

A torque detecting apparatus comprising a plurality of rotary drums fitted with a certain spacing on the drive side and load side of a rotary shaft, with signal tracks with a record of magnetic signals being formed on the surface thereof, and magnetic resistance effect elements disposed on a fixed portion which confront each of said drums, a relative displacement created by a torsion of rotational axis between said rotary drums being taken out as a resistance variation of said magnetic resistance effect elements, wherein one of said rotary drums is formed in a cup shape, and wherein said drums are fitted on said rotary shaft to meet a relation of Ld>Ls where Ld is a distance between positions on the shaft where said drums are fitted and Ls is a distance between the signal tracks, and wherein said plurality of magnetic resistance effect elements for detecting the magnetic signals on both rotary drums are formed by evaporative deposition or etching on a single substrate to form a single-chip magnetic sensor.

A torque detecting apparatus comprising a plurality of angle detectors fitted with a certain spacing on a rotational shaft which connects a load with a drive source and operates to detect a load torque from a relative angular difference of angles detected by said angle detectors, said apparatus comprising a plurality of rotary drums or rotary discs fitted with a certain spacing on the drive side and load side of said rotary shaft, with a plurality of magnetic poles for generating magnetic signals being formed on the surface thereof, and a magnetic sensor disposed to confront said surface of said rotary drums or discs, with magnetic resistance effect elements which vary in internal resistance in response to the magnetism of said magnetic poles being provided thereon, said magnetic sensor producing two sets of outputs with a virtually sinusoidal waveform in correspondence to angles of said rotary drums or discs, an angular difference of the two set of sinusoidal outputs being calculated to detect a torque.

A torque detecting apparatus comprising a plurality of angle detectors fitted with a certain spacing on a rotational shaft which connects a load with a drive source and operates to detect a load torque from a relative angular difference of angles detected by said angle detectors, said apparatus comprising a plurality of rotary drums or rotary discs fitted with a certain spacing on the drive side and load side of said rotary shaft, with a plurality of magnetic poles for generating magnetic signals being formed on the surface thereof, and a magnetic sensor disposed to confront said surface of said rotary drums or discs, with magnetic resistance effect elements which vary in internal resistance in response to the magnetism of said magnetic poles being provided thereon, said magnetic sensor producing two sets of outputs with a virtually triangular waveform in correspondence to angles of said rotary drums or discs, an angular difference of the two sets of triangular outputs being calculated to detect a torque.

A torque detecting apparatus comprising a plurality of angle detectors fitted with a certain spacing on a rotational shaft which connects a load with a drive source and operates to detect a load torque from a relative angular difference of angles detected by said angle detectors, said apparatus comprising a plurality of rotary drums or rotary discs fitted with a certain spacing on the drive side and load side of said rotary shaft, with a plurality of magnetic poles for generating magnetic signals being formed on the surface thereof, and a magnetic sensor disposed to confront said surface of said rotary drums or discs, with magnetic resistance effect elements which vary in internal resistance in response to the magnetism of said magnetic poles being provided thereon, said magnetic sensor producing two sets of outputs in correspondence to angles of said rotary drums or discs, and apparatus further comprising a ROM (memory) which stores angles corresponding to the waveform of the outputs, the angular difference of the two sets of outputs being calculated from the output of said ROM.