A torque detecting device and an electric power steering system, of which the size of the body is reduced, are provided. A torque sensor (7) includes a first rotor (31) that is fixed to an input shaft (21) and that has a predetermined shaft angle multiplier, and a second rotor (32) that is fixed to an output shaft (22) and that has a shaft angle multiplier different from that of the first rotor (31). In first to fourth output coils arranged on a stator (30) that is arranged around outer peripheries of the first and second rotors (31, 32), electric signals having different phases are generated on the basis of a variation of a gap between the stator (30) and the first and second rotors (31, 32) due to rotation of the first and second rotors (31, 32). A twist angle of a torsion bar (23), which is coupled between the input shaft (21) and the output shaft (22), is calculated on the basis of the electric signals, and a torque that acts between the input shaft (21) and the output shaft (22) is calculated on the basis of the twist angle.
TORQUE DETECTION DEVICE AND ELECTRIC POWER STEERING DEVICE
DREHMOMENTERKENNUNGSVORRICHTUNG UND SERVOLENKVORRICHTUNG
DISPOSITIF DE DÉTECTION DE COUPLE ET DISPOSITIF DE DIRECTION ASSISTÉE
2015-09-23
Patent
Electronic Resource
English
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