Machine monitor with status indicator

• US 6,297,742 B1
• Filed: 05/06/1998
• Issued: 10/02/2001
• Est. Priority Date: 08/22/1996
• Status: Expired due to Term

• Current Assignee: Computational Systems Incorporated (Emerson Electric Company)
• Original Assignee: CSI Technology Incorporated (Emerson Electric Company)
• Inventors: Pardue, Eugene F., Robinson, James C., Canada, Ronald G.
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): LA, ANH V
• Application Number:
  US09/073,754
• Time in Patent Office: 1,245 Days
• Field of Search: 340/635, 340/680, 340/679, 340/683, 340/870.09, 340/870.16, 340/870.17, 340/539, 318/471, 318/473, 318/490, 702/56, 702/132, 361/23
• US Class Current: 340/635
• CPC Class Codes: G01R 31/343 in operation
• CPC Class Codes: G01R 33/028 Electrodynamic magnetometers
• CPC Class Codes: G07C 3/00 Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
• CPC Class Codes: H02K 11/0094 Structural association with other electrical or electronic devices
• CPC Class Codes: H02K 11/20 for measuring, monitoring, testing, protecting or switching rectifiers H02K11/04; power electronics H02K11/33
• CPC Class Codes: H02K 11/25 Devices for sensing temperature, or actuated thereby
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 11/35 Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis

Abstract

A monitor attaches to a machine or proximate a machine to determine the health and operating status of the machine. The monitor is preferably self-contained, having its own internal power source, electronics, and sensor suite. One or more sensors are provided to sense machine operating characteristics such as temperature, flux, and vibration. Sensor outputs are processed and analyzed by monitor electronics to determine various operating parameters, including machine speed and load, and to determine when an anomalous machine operating condition is present. Monitor electronics are operable to transform time domain data generated by the sensors to frequency domain data for storage and/or analysis. A communications port enables a peripheral device, such as a notebook computer or portable data collector, to communicate with the monitor and download stored data. Downloaded data can be further analyzed and statistically compared to trend data at a base computer to further ascertain the health and condition of the machine.

Claims

1. A monitor for being placed in sensory contact with a machine for monitoring the operation of the machine and producing an operation history, said monitor comprising:

a structural enclosure;

an engagement surface formed on said enclosure;

a fastener for attaching said engagement surface to a mount proximate said machine so that said engagement surface is in sensory contact with the machine;

a power supply for supplying electrical power to the monitor;

a sensor disposed in said enclosure for sensing an operating parameter of the machine and producing sensor signals representative of the operating parameter that was sensed;

a signal processor disposed in said enclosure for receiving, processing, and analyzing said sensor signals to produce sensor data corresponding to the operating status of the machine, and producing an alarm signal when the analysis of said sensor signals indicates the existence of an anomalous machine condition;

an indicator for receiving alarm signals and producing a humanly perceivable indication of an anomalous machine condition when an alarm signal is received; and

memory for storing sensor data, said stored sensor data corresponding to the operation history of the machine.

2. The monitor of claim 1 wherein said signal processor is further operable to perform a fast Fourier transform of said sensor signals to produce machine operating data in the form of spectra, said processor being further operable to analyze said spectra to determine the condition of the machine.

3. The monitor of claim 1 wherein said indicator includes a visual indicator for providing a visual indication corresponding to the operating condition of the machine based on the presence or absence of alarm signals.

4. The monitor of claim 3 wherein said visual indicator is further operable to provide a visual indication of the severity of anomalous machine conditions.

5. The monitor of claim 4 wherein said visual indicator includes:

a yellow illumination element for visually indicating the presence of an intermediate level machine fault condition which does not require immediate attention; and

a red illumination element for visually indicating the presence of a critical machine fault condition requiring immediate attention.

6. The monitor of claim 1, further comprising a communications module formed in said housing to enable the monitor to communicate with a peripheral device.

7. The monitor of claim 6 wherein said communications module includes an infrared communications module.

8. The monitor of claim 6 wherein said communications module includes an RF communications module for wirelessly communicating with the peripheral device.

9. The monitor of claim 1 wherein said fastener includes:

a threaded stud attached to the outer surface of the machine; and

a recess formed in said housing and threaded to receive said stud so that when the recess and stud are adjacent each other, rotation of the monitor in a first direction attaches the monitor to the stud and rotation of the monitor in a second direction which is opposite to said first direction disengages the monitor from the stud.

10. The monitor of claim 1 wherein said sensor includes a vibration sensor for sensing machine vibration.

11. The monitor of claim 1 wherein said sensor includes a temperature sensor for sensing machine temperature.

12. The monitor of claim 1 wherein said sensor includes a flux sensor for sensing an electrical characteristic of said machine.

13. The monitor of claim 1 wherein said power supply includes a dc power source disposed in said enclosure.

14. The monitor of claim 1, further comprising a wireless transmitter for transmitting wireless alarm signals when an anomalous machine condition is detected, said indicator being remote from said monitor and including a receiver for receiving wireless alarm signals and annunciating alarm conditions through humanly perceivable indications.

15. A machine fault detection and indicator system for monitoring the operating condition of a plurality of machines and indicating to personnel when one or more anomalous machine conditions are detected, the system comprising:

for each of said plurality of machines, at least one monitor permanently attached to the machine for sensing and analyzing an operating characteristic of the machine, producing an alarm signal when an anomalous machine operating characteristic is sensed, and producing a humanly perceivable indication of an anomalous condition when an alarm signal is produced, said at least one monitor including;

a housing;

a fastener for attaching said housing to the exterior surface of a machine;

a sensor disposed within said housing for sensing an operating characteristic of the machine and producing sensor signals representative of the operating characteristic that was sensed;

a signal processor disposed in said housing for receiving, processing, and analyzing said sensor signals to determine the operating status of the machine, and producing an alarm signal when the analysis of said sensor signals indicates the existence of an anomalous machine condition; and

an indicator for receiving alarm signals and producing a humanly perceivable indication of an anomalous machine condition when an alarm signal is received; and

a peripheral device for obtaining machine operating data from a monitor when an anomalous machine condition is indicated.

16. The system of claim 15 wherein each of said monitors includes a wireless transmitter for transmitting a wireless signal when an anomalous machine condition is detected, said system further including an annunciation device for receiving a wireless signal transmitted by a monitor and indicating the presence of an anomalous machine condition when a wireless signal is received.

17. The system of claim 16 wherein said wireless signal corresponds to the severity of the anomalous condition, and wherein said annunciation device indicates fault severity as represented by wireless signals transmitted by said wireless transmitter.

18. The system of claim 15 wherein each of said monitors includes a memory for storing operating characteristics of the machine, said machine operating data being obtained by the peripheral device from data stored in a monitor.

19. The system of claim 15 wherein said peripheral device includes a sensor for obtaining the machine operating data.

20. The system of claim 15, further comprising a base computer for receiving and analyzing the machine operating data to determine an anomalous machine condition which contributed to the alarm signal.