EP0107082A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Torque sensor and method for manufacturing the same
Assignee: Toshiba Corp
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Filing: 1983-09-27
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Granted: —
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Expires: 2003-09-27
Abstract
Abstract @ There are disclosed a torque sensor having a rotary shaft and a thin strip of an amorphous magnetic alloy which has a great magnetic strain constant windingly fixed on the rotary shaft and detecting a torque in a non-contact style by a variation in magnetic properties of the thin strip of the amorphous alloy, characterized in that the amorphous alloy is an iron-based amorphous alloy having a crystallization temperature of 450°C or more, and a method for manufacturing the same, characterized in that an inductive magnetic anisotropy had been previously given to the thin strip and then the thin strip is windingly fixed on the rotary shaft. The torque sensor according to the present invention permits measuring a large torque with a good accuracy in an extensive temperature, and is manufactured with ease.
Inventors
- 👤 Koichiro Inomata
- 👤 Takao Sawa
- 👤 Osamu Arakawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 15:02
CPC Classifications
G; G01; G01L; G01L3/00; G01L3/02; G01L3/04; G01L3/10; G01L3/101; G01L3/102; G01L3/103; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15308; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F10/13; H01F10/131; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
75 words
A torque sensor which has a rotary shaft and a thin strip of an amorphous magnetic alloy windingly fixed on the rotary shaft and having a great magnetic strain constant and which detects a torque in a non-contact style by a variation in magnetic properties of the thin strip of the amorphous magnetic alloy, characterized in that said amorphous magnetic alloy is an iron-based amorphous alloy having a crystallization temperature of 450 °C or more.
Claim 2
Dependent Claim
75 words
A torque sensor which has a rotary shaft and a thin strip of an amorphous magnetic alloy windingly fixed on the rotary shaft and having a great magnetic strain constant and which detects a torque in a non-contact style by a variation in magnetic properties of the thin strip of the amorphous magnetic alloy, characterized in that said amorphous magnetic alloy is an iron-based amorphous alloy having a crystallization temperature of 450 °C or more.
Claim 3
Dependent Claim
20 words
A torque sensor according to Claim 1, wherein said iron-based amorphous alloy has a thickness of 20 pm or less.
Claim 4
Dependent Claim
29 words
A torque sensor according to Claim 1, wherein said iron-based amorphous alloy has an absolute value of a magnetic strain constant of at least 5 x 10- 6 .
Claim 5
Dependent Claim
38 words
A torque sensor according to Claim 1, wherein said thin strip of the amorphous magnetic alloy is fixed on said rotary shaft by a shape-memory alloy fixing material which wraps said thin strip of the amorphous magnetic alloy.
Claim 6
Dependent Claim
26 words
A torque sensor according to Claim 4, wherein said shape-memory alloy is selected from the gorup consisting of Au-Cd, Cu-Al-Ni, Cu-Al-Zn, Cu-Sn, In-Tl, Ni-Al and Ni-Ti.
Claim 7
Dependent Claim
101 words
A torque sensor according to Claim 1, wherein said iron-based amorphous alloy is represented by the following formula: wherein M 1 is Co and/or Ni; M 2 is at least one selected from the group consisting of Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, Ta and W; a is in the range of 0 ≤ a ≤ 0.2; b is in the range of 0 < b < 0.1; and x, y and z are numbers satisfying the relations of 0 < x < 20, 5 < y < 30 and x + y + z = 100, respectively.
Claim 8
Dependent Claim
20 words
A torque sensor according to Claim 6, wherein said iron-based amorphous alloy has a thickness of 20 pm or less.
Claim 9
Dependent Claim
29 words
A torque sensor according to Claim 6, wherein said iron-based amorphous alloy has an absolute value of a magnetic strain constant of at least 5 x 10 -6 .
Claim 10
Dependent Claim
38 words
A torque sensor according to Claim 6, wherein said thin strip of the amorphous magnetic alloy is fixed on said rotary shaft by a shape-memory alloy fixing material which wraps said thin strip of the amorphous magnetic alloy.
Claim 11
Dependent Claim
26 words
A torque sensor according to Claim 9, wherein said shape-memory alloy is selected from the gorup consisting of Au-Cd, Cu-Al-Ni, Cu-Al-Zn, Cu-Sn, In-Tl, Ni-Al and Ni-Ti.
Claim 12
Independent Claim
92 words
A method for manufacturing a torque sensor which has a rotary shaft and a thin strip of an amorphous magnetic alloy windingly fixed on the rotary shaft and having a great mangetic strain constant and which detects a torque in a non-contact style on the basis of a variation in magnetic properties of the thin strip of the amorphous magnetic alloy, characterized in that after an inductive magnetic anisotropy has been previously given to said thin strip of the amorphous magnetic alloy, said thin strip is windingly fixed on the rotary shaft.
Claim 13
Independent Claim
92 words
A method for manufacturing a torque sensor which has a rotary shaft and a thin strip of an amorphous magnetic alloy windingly fixed on the rotary shaft and having a great mangetic strain constant and which detects a torque in a non-contact style on the basis of a variation in magnetic properties of the thin strip of the amorphous magnetic alloy, characterized in that after an inductive magnetic anisotropy has been previously given to said thin strip of the amorphous magnetic alloy, said thin strip is windingly fixed on the rotary shaft.
Claim 14
Dependent Claim
112 words
A method for manufacturing a torque sensor according to Claim 11, wherein said thin strip of the amorphous magnetic alloy comprises an amorphous alloy represented by the following formula: wherein M 1 is Co and/or Ni; M 2 is at least one selected from the group consisting of Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, Ta and W; a is in the range of 0 ≤ a ≤ 0.2; b is in the range of 0 < b < 0.1; and x, y and z are numbers satisfying the relations of 0 < x < 20, 5 ≤ y ≤ 30 and x + y + z = 100, respectively.
Claim 15
Dependent Claim
32 words
A method for manufacturing a torque sensor according to Claim 11, wherein said amorphous alloy has an absolute value of a magnetic strain constant of at least 5 x 10 -6 .
Claim 16
Dependent Claim
46 words
A method for manufacturing a torque sensor according to Claim 11, wherein said thin strip of the amorphous magnetic alloy is fixed on said rotary shaft by a shape-memory function of said shape-memory alloy fixing material which wraps said thin strip of the amorphous magnetic alloy.
Claim 17
Dependent Claim
30 words
A method for manufacturing a torque sensor according to Claim 11, wherein said shape-memory alloy is selected from the gorup consisting of Au-Cd, Cu-Al-Ni, Cu-Al-Zn, Cu-Sn, In-Tl, Ni-Al and Ni-Ti.
References Cited (Backward Citations)
DE2908972A1
Cited
DE2939566A1
Cited
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