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AssigneeFanuc Corporation
InventorsKeitarou Inagaki, Kazunori Iijima, Kazuhiro Satou
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To provide an abnormality monitoring device capable of reducing the size of a mounted device, enabling high-speed response, and achieving high accuracy in detecting abnormality. The abnormality monitoring device includes: at least one filter that extracts state information pertaining to drive of a mechanism of an industrial machine using a motor, as a signal of at least one frequency band; an integrator that integrates an output of the filter in each frequency band; and an abnormality detection unit that detects abnormality based on an integrated value integrated by the integrator. The state information may be control information of the controller that controls the motor or detection information from at least one detector attached to the mechanism.
An abnormality monitoring device, comprising:
A control device that controls a motor that drives a mechanism of an industrial machine, the control device comprising:
An abnormality monitoring method, comprising:
Dependencies are inferred from the claim text.
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Bearings: acoustic or vibration analysis
With devices affected by abnormal or undesired conditions: related to temperature and heat, e.g. insulation
With devices affected by abnormal or undesired conditions: related to vibration and noise
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…
About 14 years 5 months of term left · ends 8 Apr 2041 (estimated)
This application is based on and claims the benefit of priority from Japanese Patent Application No. 2018-146804, filed on 3 Aug. 2018, the content of which is incorporated herein by reference.
The present invention relates to an abnormality monitoring device, an abnormality monitoring method, and a control device.
An abnormality monitoring device for use in an industrial machine is disclosed in, e.g. Patent Documents 1 to 3. Patent Document 1 discloses an abnormality diagnostics device for use in machinery and equipment provided with a component that rotates or slides relative to a stationary member. The abnormality diagnostics device includes: a detection unit which is fixed to a rotating or sliding component or to a stationary member and which has a vibration sensor and a temperature sensor; and a signal processing unit for determining a state of the component based on a detection signal outputted from the detection unit. The signal processing unit includes: a comparison/collation unit for comparing a frequency component calculated based on a rotational velocity signal arising from damage to the component and a frequency component of actually measured data based on the signal detected by the vibration sensor; and an abnormality determination unit for determining presence or absence of abnormality of the component or identifying a damaged portion based on a result of comparison by the comparison/collation unit.
FIG. 1 is a schematic diagram showing a servo control device of a first embodiment of the present invention;
FIG. 2 is a block diagram showing a configuration of an abnormality monitoring unit;
FIG. 3 is a waveform diagram showing a waveform fs(t) of a torque command;
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a servo control device according to a first embodiment of the present invention. The servo control device 10 controls the rotation of a servo motor 20; and the servo motor 20 is included in an industrial machine and drives a mechanism 30 of the industrial machine. The servo control device 10 serves as a control device for controlling a motor for driving the mechanism of the industrial machine. The industrial machine is a machine tool, an industrial robot, a forging machine such as an electric pressing machine, an injection molding machine, or the like. The servo control device 10 together with the servo motor 20 may be included in the industrial machine.
The servo control device 10 includes a position command generation unit 101, a subtractor 102, a position control unit 103, a subtractor 104, a velocity control unit 105, a subtractor 106, a current control unit 107, an integrator 108, a control information acquisition unit 109, and an abnormality monitoring unit 110. The abnormality monitoring unit 110 serves as an abnormality monitoring device. The control information acquisition unit 109 and the abnormality monitoring unit 110 are provided herein as part of the servo control device 10, but may be provided separately from the servo control device 10.