Anomaly Detection for a Cutting Machine with an Electrically Driven Spindle
AssigneeSiemens Aktiengesellschaft
InventorLouis LEVEQUE
Life of this patent
Estimating the term…
Abstract
A method for anomaly detection in a cutting machine with a spindle that is driven by an electric motor, wherein the method includes determining an electric power consumption of the motor during a working cycle of the machine, dividing the working cycle into time windows, determining, for each time window, whether the spindle was cutting and/or idling based on associated electric power values, determining median and expected deviation of electric power values for cutting and idling operation over the sequence of time windows, and determining an anomaly if electric power values during cutting or idling exceed a predetermined relationship to the corresponding median and expected deviation values.
Claims16
A method for anomaly detection in a cutting machine with a spindle which is driven by an electric motor, the method comprising:
- determining an electric power consumption of the motor during a working cycle of the machine;
- dividing the working cycle into time windows;
- determining, for each time window, whether the spindle was at least one of cutting and idling based on associated electric power values;
- determining median and expected deviation of electric power values for cutting and idling operation over the sequence of time windows;
- and
- determining an anomaly if electric power values during cutting or idling exceed a predetermined relationship to the corresponding median and expected deviation values.
A non-transitory computer-readable medium encoded with instructions which, when executed by at least one of an electronic device and electronic control system, cause the electronic device and/or electronic control system to detect anomalies in a cutting machine with a spindle which is driven by an electric motor, the instructions comprising:
- program code for determining an electric power consumption of the motor during a working cycle of the machine;
- program code for dividing the working cycle into time windows;
- program code for determining, for each time window, whether the spindle was at least one of cutting and idling based on associated electric power values;
- program code for determining median and expected deviation of electric power values for cutting and idling operation over the sequence of time windows;
- and
- program code for determining an anomaly if electric power values during cutting or idling exceed a predetermined relationship to the corresponding median and expected deviation values.
A monitoring device for a cutting machine with a spindle which is driven by an electric motor, the monitoring device comprising:
- a first interface to the cutting machine for determining electric power consumption of the motor;
- a second interface for outputting an indication;
- a processor which is configured to:
- determine electric power consumption of the motor during a working cycle of the machine;
- divide the working cycle into time windows;
- determine, for each time window, whether the spindle was at least one of cutting and idling based on associated electric power values;
- determine median and expected deviation of electric power values for cutting and idling operation over the sequence of time windows;
- and
- determine an anomaly if electric power values during cutting or idling exceed a predetermined relationship to the corresponding median and expected deviation values.
Dependencies are inferred from the claim text.