Asea Aktiebolag

Asea Brown Boveri Ab

Christer Aminder

Jarl R Sobel

Jan O Nordvall

A method for preventing magneto-elastic torque transducers (1,2) from being influenced by a static, axially-extending magnetic field (9) comprises dividing the driving shaft between the driving source and the load in such a way that the shaft (3) between the driving source and the transducer shaft and the shaft (4) between the transducer shaft and the load, respectively, are provided with a shaft part (7,8) of non-magnetic material and that the transducer and the transducer shaft including the non-magnetic shaft parts are surrounded by an external magnetic shield (5) provided with flanges such that a very small air gap is present between the shield and the non-magnetic shaft parts.

Shielding of magnetoelastic torque transducers from low-frequency

A torque transducer which is constructed so as to be protected from an overload includes a measuring axle which extends through a housing and a take-up axle which also extends through the housing in parallel with the measuring axle. The portion of the measuring axle within the housing includes two spaced apart gear wheels which are respectively engaged with backlash with gear wheels on the take-up axle, the gear wheels on the measuring axle being larger in diameter than the gear wheels on the take-up axle. When the measuring axle is subjected to excessive torque, such that the portion thereof within the housing twists sufficiently, the gear wheels on the measuring axle will engage with the gear wheels on the take-up axle to transfer the excessive torque to the take-up axle.

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Vaster.ang.s, Sweden

Christer Aminder