US Patent No: 5,293,125

Number of patents in Portfolio can not be more than 2000

Self-aligning tachometer with interchangeable elements for different resolution outputs

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Importance

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Abstract

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A tachometer for monitoring the rotation of an output shaft (e.g. of a motor, where the motor is enclosed within a standard NEMA housing), includes an enclosure (e.g. adapted to be secured to an end plate of the motor housing), the enclosure having a radial center and a longitudinal axis which, when the enclosure is secured to the housing, are aligned with a longitudinal axis of the output shaft. The enclosure has at least one mounting surface in a peripheral wall portion thereof, the mounting surface having an aperture formed therein which opens in a radial direction. A sensor module including a pair of axially aligned magneto-resistive sensors is mountable on the mounting surface of the enclosure such that the module protrudes through the aperture with the sensors facing radially inwardly. An annular drum having a pair of magnetic patterns arranged on a peripheral end surface thereof is operatively fixed on the motor output shaft via a hub member such that the magnetic patterns on the drum are automatically aligned with the sensors and radially spaced therefrom by a predetermined radial gap when the drum is fixed to the output shaft and the enclosure is mounted on the end plate in an operatively assembled relationship.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
LAKE SHORE CRYOTRONICS, INC.WESTERVILLE, OH22

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bioty, Joseph F Westerville, OH 3 38
Griffen, Neil C Westerville, OH 20 439
Stokes, Richard S Westerville, OH 7 98

Cited Art Landscape

Patent Info (Count) # Cites Year
 
HITACHI, LTD. (9)
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* 4,853,632 Apparatus for magnetically detecting a position of a movable magnetic body 32 1981
* 4,639,807 Magnetic detector having magnetoresistive elements 23 1983
* 4,766,376 Magnetic position detector for detecting an absolute position of a movable member 17 1986
* 4,786,870 Magnetic sensor for magnetically detecting the position of a movable body 16 1986
* 4,816,948 Magneto-resistive head 18 1987
* 4,818,939 Apparatus for magnetically detecting position or speed or moving body utilizing bridge circuit with series connected MR elements 30 1987
* 4,874,053 Torque detecting apparatus 55 1988
* 5,019,776 Magnetic position detection apparatus having two magnetic recording medium tracks with magnetoresistors arranged in a bridge circuit so as to eliminate even order harmonic distortion 24 1989
 
ADMOTEC, INC (2)
* 4,853,631 Magnetoresistive sensor having inter-leaved magnetoresistive elements for detecting encoded magnetic information 13 1987
* 4,866,382 Magnetic rotary encoder system having a multi-element magnetoresistive sensor 20 1987
 
MID-AMERICA COMMERCIALIZATION CORPORATION (2)
* 4,857,841 Proximity detector employing magneto resistive sensor in the central magnetic field null of a toroidal magnet 19 1987
* 4,914,389 Multiturn shaft position sensor with backlash compensation 24 1988
 
ROBERT BOSCH GMBH (2)
* 4,506,217 Gear tooth position and speed sensor with four, bridge circuit connected, magnetic resistance tracks 30 1982
* 4,712,064 Magnetoresistive sensor for detecting position or speed of a ferromagnetic body 48 1986
 
The Torrington Company (2)
* 4,914,387 Magnetic speed sensor with an adaptive threshold circuit for use with a bearing assembly 42 1988
* 5,081,416 Magnetic encoder with retainer ring for retaining magnetic encoder ring on a rotating shaft 13 1990
 
VISI-TRAK WORLDWIDE, LLC (2)
* 5,041,784 Magnetic sensor with rectangular field distorting flux bar 22 1989
* 4,992,733 Position sensing transducer having a circular magnet with an integral flux distorting member and two magnetic field sensors 24 1989
 
CARNEGIE MELLON UNIVERSITY (1)
* 4,800,457 Magnetoresistive sensor element 20 1987
 
EATON CORPORATION (1)
* 4,922,197 High resolution proximity detector employing magnetoresistive sensor disposed within a pressure resistant enclosure 54 1988
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
* 4,668,913 Constant flux magneto resistive magnetic reluctance sensing apparatus 33 1985
 
Kabushiki Kaisha Yaskawa Denki Seisakusho (1)
* 4,851,771 Magnetic encoder for detection of incremental and absolute value displacement 41 1988
 
KOYO SEIKO CO., LTD. (1)
* 4,907,445 Automobile wheel bearing unit 21 1988
 
KYKLOS BEARING INTERNATIONAL, INC. (1)
* 4,988,220 Servicable wheel speed sensor assembly 36 1990
 
Nippon Electric Co., Ltd. (1)
* 4,319,188 Magnetic rotary encoder for detection of incremental angular displacement 69 1980
 
SIEMENS AKTIENGESELLSCHAFT (1)
* 4,890,059 Digital tachometer with air gap adjusting yoke insertable through holes in the tachometer housing 15 1988
 
STANDARD ELEKTRIK LORENZ AG (1)
* 4,975,675 Device comprising at least one magneto-resistor contained in a housing 8 1988
 
TECHNOLOGY HOLDING COMPANY (1)
* 4,742,297 Programmable cycle meter 14 1986
 
U.S. PHILIPS CORPORATION (1)
* 4,686,472 Magnetic sensor having closely spaced and electrically parallel magnetoresistive layers of different widths 34 1986
 
VICTOR COMPANY OF JAPAN, LTD. (1)
* 4,656,377 Tachogenerator having a magnetoresistance stator coil 14 1985
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
STEERING SOLUTIONS IP HOLDING CORPORATION (4)
6,530,269 Enhanced motor velocity measurement using a blend of fixed period and fixed distance techniques 5 2000
6,498,409 Tachometer apparatus and method for motor velocity measurement 12 2000
6,791,217 Method and system for motor velocity measurement 5 2002
7,075,290 Tachometer apparatus and method for motor velocity measurement 9 2002
 
LAKE SHORE CRYOTRONICS, INC. (3)
* 5,514,955 Slim profile digital tachometer including planar block and rotor having spokes and clamp 0 1994
* 5,680,042 Magnetoresistive sensor with reduced output signal jitter 18 1994
* 5,900,727 Magneto-resistive tachometer kit including two sensor modules providing different resolution quadrature outputs from the same rotor 5 1997
 
NorthStar Technologies Inc. (2)
6,246,233 Magnetoresistive sensor with reduced output signal jitter and temperature compensation 19 1997
6,300,758 Magnetoresistive sensor with reduced output signal jitter 20 1999
 
ASMO CO., LTD. (1)
* 6,091,171 Electric motor having rotation detection sensor 11 1999
 
AVTRON INDUSTRIAL AUTOMATION, INC. (1)
* 5,608,277 Rotary pulse generator having preset sensor gap 2 1994
 
DANAHER CONTROLS CORPORATION (1)
* 6,717,302 Motor for use with a sensor 9 2002
 
EMW GROSCHOPP INCORPORATED (1)
* 5,461,270 Attachment device for speed sensor in a motor 6 1994
 
GENERAL MOTORS CORPORATION (1)
* 5,508,611 Ultrathin magnetoresistive sensor package 27 1994
 
Groschopp, Inc. (1)
* RE36336 Attachment device for speed sensor in a motor 1 1996
 
LEOPOLD KOSTAL GMBH & CO. KG (1)
* 6,107,713 Drive assembly 22 1999
 
LEXMARK INTERNATIONAL, INC. (1)
* 5,763,970 Encoder system with cover mounted encoder 6 1997
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
* 5,952,824 Magnetic detecting apparatus with giant magnetoresistive sensing element and level shifting waveform processing circuit 7 1997
 
NIDEC MOTOR CORPORATION (1)
* 8,004,135 Electric motor and controller assembly with integrated sensor device 0 2007
 
PACIFIC CENTURY MOTORS, INC. (1)
6,510,396 Symmetry compensation for encoder pulse width variation 9 2000
 
REGAL-BELOIT ELECTRIC MOTORS, INC. (1)
* 6,354,162 Sensor mounting assembly and method 6 2001
 
SAIA-BURGESS ELECTRONICS AG (1)
* 6,211,588 Electromoter having a position sensor with a plurality of field sensitive elements on a semiconductor chip 3 1998
 
SAMSUNG THALES CO., LTD. (1)
* 6,098,025 Apparatus and method for calibrating moment-of-inertia and center-of-gravity 6 1998
 
SIEMENS INDUSTRY, INC. (1)
* 5,406,156 Electrodynamic machine having self-aligning housing mounting system 1 1993
 
SSI TECHNOLOGIES, INC. (1)
* 5,744,950 Apparatus for detecting the speed of a rotating element including signal conditioning to provide a fifty percent duty cycle 16 1996
 
THE RESEARCH FOUNDATION OF STATE UNIVERSITY OF NEW YORK (1)
* 5,929,631 Method of position sensing utilizing giant magneto resistance elements and solid state switch array 14 1997
 
VALEO SCHALTER UND SENSOREN GMBH (1)
* 6,198,185 Magnetic ring 4 1999
* Cited By Examiner