WO2001092894A2 - Integrated speed sensor for elevator application - Google Patents
Integrated speed sensor for elevator application Download PDFInfo
- Publication number
- WO2001092894A2 WO2001092894A2 PCT/US2001/008780 US0108780W WO0192894A2 WO 2001092894 A2 WO2001092894 A2 WO 2001092894A2 US 0108780 W US0108780 W US 0108780W WO 0192894 A2 WO0192894 A2 WO 0192894A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- encoder
- sensor
- signal
- elevator
- output
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/3492—Position or motion detectors or driving means for the detector
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
Definitions
- This invention pertains to the field of elevator control, and in particular, to an integrated speed sensor using a bearing encoder.
- Elevators may require up to three different speed feedback signals: (1) a high resolution quadrature motor speed control feedback (main encoder), (2) a low resolution quadrature rescue encoder (rescue encoder), and a low resolution single track ANSI speedcheck encoder (ANSI encoder).
- Providing these three signals requires either three separate encoders mounted on a shaft of the machine, or a combination of a multiple track encoder and a third sensor designed to provide the rescue functionality.
- the encoders can take up to 40 mm of space at the end of the machine. This space is preferably used for machine adjustment, so it is desirable to eliminate the need for the encoders.
- Another reason for eliminating encoders is that encoders have proven to be the weak link in elevator control systems because they require coupling to the elevator motor shaft.
- an integrated sensor for an elevator includes a bearing encoder with two or three Hall effect sensors on the encoder.
- One sensor is used to provide a high resolution quadrature signal for speed control, with the other sensors providing a low resolution signal that is used for a rescue encoder quadrature signal and an ANSI speedcheck encoder signal.
- an integrated sensor for an elevator includes a bearing encoder; first and second Hall effect sensors on the encoder; wherein an output of the first sensor is a high resolution quadrature signal and an output of the second sensor is a low resolution signal.
- Fig. 1 shows an end view of a prior art bearing encoder.
- Fig. 2 shows an end view of a bearing encoder according to an embodiment of the present invention.
- Fig. 3 shows a perspective view of the encoder of Fig. 2.
- a high resolution magnetic sensor such as a bearing encoder 10 includes an outer bearing casing 12 and an inner race 16 that fit around a shaft 18.
- a magnetic ring 14, attached to inner race 16, is subdivided into a plurality of north and south magnetic poles.
- Inner ring 14 and inner race 16 move with shaft 18, while a Hall effect sensor 20 remains stationary.
- Sensor 20 detects the changing magnetic fields caused by the rotation of ring 14 and provides an output.
- the output is conditioned by electronics and sent directly to a control processor.
- the pulses per revolution (PPR) of bearing encoder 10 is equal to the number of north-south magnetic poles in ring 14.
- the output is processed by some other means and a high resolution output is produced, such as 4,096 PPR.
- High resolution magnetic sensors are known to be manufactured by Heidenheim, SKF, and Torrington. Such a sensor would be used to provide motor speed control feedback for a drive motor for an elevator.
- a bearing encoder 30 includes second and third sensors 22 and 24, which operate the same way as sensor 20.
- Such a bearing encoder has applicability to the elevator industry because of the need for a rescue encoder and an ANSI speedcheck encoder.
- the rescue encoder is used by a mechanic as a visual check of the speed of the elevator car during a rescue operation. Since the rescue encoder signal is not used for controlling the elevator car, it does not need to be a high resolution signal, but it needs to be a quadrature signal for direction sensing.
- the ANSI speedcheck encoder provides an independent speed check and is required by code in North America,. This signal is also a low resolution signal, but only has to be a single track signal. Since the it is not used for controlling the elevator car, it does not need to be a high resolution signal. Using two sensors makes it possible to obtain quadrature signals.
- the sensor output can be processed in one of two ways.
- the output is conditioned by electronics and sent directly to the elevator system's control processor.
- the number of pulses per revolution is equals the number of north-south magnetic pole pairs.
- the output is processed to Obtain a high resolution signal, such as the 4,096 pulses per revolution described above.
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Indicating And Signalling Devices For Elevators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US58421500A | 2000-05-31 | 2000-05-31 | |
US09/584,215 | 2000-05-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001092894A2 true WO2001092894A2 (en) | 2001-12-06 |
WO2001092894A3 WO2001092894A3 (en) | 2002-04-11 |
Family
ID=24336387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/008780 WO2001092894A2 (en) | 2000-05-31 | 2001-03-19 | Integrated speed sensor for elevator application |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2001092894A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010150416A1 (en) | 2009-06-26 | 2010-12-29 | Mitsubishi Electric Corporation | Rotary speed detection device with error monitoring |
WO2014113015A1 (en) * | 2013-01-18 | 2014-07-24 | Otis Elevator Company | Encoder resolution reduction |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5026178A (en) * | 1989-05-05 | 1991-06-25 | Gmn Georg Miller Nurnberg Ag Aktiengesellschaft | Sensor bearings for determining rotational speed and/or angle of torsion |
EP0443940A2 (en) * | 1990-02-22 | 1991-08-28 | Snr Roulements | Apparatus for sensing the direction and speed of a steering wheel shaft |
WO1996033124A1 (en) * | 1995-04-21 | 1996-10-24 | Wittur Aufzugteile Gmbh & Co. | Method of controlling and monitoring the operation of a lift installation, and a roller bearing for use in the method |
-
2001
- 2001-03-19 WO PCT/US2001/008780 patent/WO2001092894A2/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5026178A (en) * | 1989-05-05 | 1991-06-25 | Gmn Georg Miller Nurnberg Ag Aktiengesellschaft | Sensor bearings for determining rotational speed and/or angle of torsion |
EP0443940A2 (en) * | 1990-02-22 | 1991-08-28 | Snr Roulements | Apparatus for sensing the direction and speed of a steering wheel shaft |
WO1996033124A1 (en) * | 1995-04-21 | 1996-10-24 | Wittur Aufzugteile Gmbh & Co. | Method of controlling and monitoring the operation of a lift installation, and a roller bearing for use in the method |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010150416A1 (en) | 2009-06-26 | 2010-12-29 | Mitsubishi Electric Corporation | Rotary speed detection device with error monitoring |
WO2010150596A1 (en) * | 2009-06-26 | 2010-12-29 | Mitsubishi Electric Corporation | Sensing device |
JP2012529627A (en) * | 2009-06-26 | 2012-11-22 | 三菱電機株式会社 | Detection device and control device for elevator or escalator |
CN102803971A (en) * | 2009-06-26 | 2012-11-28 | 三菱电机株式会社 | Rotary speed detection device with error monitoring |
KR101313370B1 (en) * | 2009-06-26 | 2013-10-01 | 미쓰비시덴키 가부시키가이샤 | Sensing device, and control device for elevator and escalator |
KR101317030B1 (en) * | 2009-06-26 | 2013-10-11 | 미쓰비시덴키 가부시키가이샤 | Sensing device, and control device for elevator and escalator |
WO2014113015A1 (en) * | 2013-01-18 | 2014-07-24 | Otis Elevator Company | Encoder resolution reduction |
US9979412B2 (en) | 2013-01-18 | 2018-05-22 | Otis Elevator Company | Encoder resolution reduction |
Also Published As
Publication number | Publication date |
---|---|
WO2001092894A3 (en) | 2002-04-11 |
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