EP0932025A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Actuator of a paper or board machine
Assignee: Valmet Automation Oy
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Filing: 1999-01-20
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Granted: —
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Expires: 2019-01-20
Abstract
Abstract The invention relates to an actuator comprising a motor (4) by which the shafts (1, 5, 7) of the actuator are driven. At least one magnet (2) is arranged in conjunction with the shaft (1, 5, 7). The actuator further comprises at least one Hall sensor (3), which generates pulses as the magnet (2) on the shaft (1, 5, 7) passes the Hall sensor (3) as the shaft (1, 5, 7) rotates. The pulses are used to define the position of the actuator in the linear direction (Fig. 2).
Inventors
- 👤 Jukka Sorsa
- 👤 Juha Sanaksenaho
- 👤 Kimmo Saunisto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:39
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; G01D5/145; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/23; G05B19/231; G05B19/232; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8225; Y10T137/8242
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
An actuator of a paper or board machine comprising a motor (4);
a shaft (1, 5, 7) driven by the motor (4), the position of the actuator in the
linear direction being adjusted by rotating the shaft (1, 5, 7) by the motor (4);
and a sensor which is arranged to measure the rotation of the shaft (1, 5, 7)
and to generate a pulse output proportional to the rotation of the shaft (1, 5 7)
to define the position of the actuator in the linear direction, characterized in that at least one detection point is arranged in conjunction with
the shaft (1, 5, 7) and that the apparatus comprises at least one Hall sensor
(3), which generates a pulse when the detection point of the shaft (1, 5, 7)
revolves past the Hall sensor (3).
Claim 2
Dependent Claim
34 words
An actuator as claimed in claim 1, characterized in that
the detection point in conjunction with the shaft (1, 5, 7) comprises a magnet
(2) arranged in conjunction with the shaft (1, 5, 7).
Claim 3
Dependent Claim
99 words
An actuator as claimed in claim 1 or 2, characterized in
that the apparatus comprises a detection point wheel (8), which is arranged to
be driven by the shaft (1, 5, 7), the rim of that part of the shaft (1, 5, 7) which
comes into contact with the detection point wheel (8) being larger than the rim
of that part of the detection point wheel (8) which comes into contact with the
shaft (1, 5, 7), so that when the shaft (1, 5, 7) rotates, the detection point
wheel (8) rotates faster than the shaft (1, 5, 7).
Claim 4
Dependent Claim
30 words
An actuator as claimed in any one of the preceding claims, characterized in that the Hall sensor (3) is arranged in conjunction
with the shaft (5) of the motor (4).
Claim 5
Dependent Claim
21 words
An actuator as claimed in any one of the preceding claims, characterized in that the motor (4) is a synchronous motor.
References Cited (Backward Citations)
GB2039079A
Cited
DE3138323A1
Cited
US4719419A
Cited
DE3726885A1
Cited
WO1995020781A1
Cited
DE19506938A1
Cited
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