Abstract: A method and device of determining a fault condition in a synchronous motor including a rotor provided with damper bars and an end ring to which the damper bars are mechanically connected thereby forming a damper cage, wherein the method includes: obtaining a first measurement of an end ring current from a first location along the end ring, processing the first measurement to thereby obtain a processing result, and determining whether a fault condition is present in the synchronous motor based on the processing result.

Abstract: The present disclosure discloses a Condition Monitoring Device (CDM), configured to monitor power consumption and loading of motor. The CDM receives value of a measured current in a stator of the motor, and measures at least one of a magnetic flux around the motor and vibrations in the motor. The magnetic flux, the vibrations and the current in the stator are measured within a predefined time window. The CDM calculates various parameters of the motor and estimates a value of current using the measurements and rated parameters stored in the CDM. The estimated parameter of current is compared with the measured value of current. A value of rotor speed (one of the rated parameters) is varied until the value of the estimated current is approximately equal to the value of the measured current. The value of current is considered to monitor power consumption and loading of the motor.

Abstract: A method for preventing a frequency component of a voltage from occurring in an electrical machine including the steps of: obtaining, either by measuring a voltage signal or a current signal from the electrical machine in time domain and transforming the measured signal into frequency domain, by simulating or deducing a first frequency component present in the electrical machine in absence of a grounding, the first frequency component representing a first undesired frequency higher than a limit frequency of 500 Hz; and providing the electrical machine with a first grounding at a grounding location, the first grounding including a resonant circuit resonating at the first undesired frequency. In order to get rid of harmful shaft voltages in the form of sharp voltage peaks at high frequencies, it is first necessary to determine at which undesired frequency or frequencies these voltage peaks occur.

Abstract: The present disclosure discloses a Condition Monitoring Device (CDM), configured to monitor power consumption and loading of motor. The CDM receives value of a measured current in a stator of the motor, and measures at least one of a magnetic flux around the motor and vibrations in the motor. The magnetic flux, the vibrations and the current in the stator are measured within a predefined time window. The CDM calculates various parameters of the motor and estimates a value of current using the measurements and rated parameters stored in the CDM. The estimated parameter of current is compared with the measured value of current. A value of rotor speed (one of the rated parameters) is varied until the value of the estimated current is approximately equal to the value of the measured current. The value of current is considered to monitor power consumption and loading of the motor.

Abstract: An inspection system for inspecting an internal component of a machine includes a remote controlled vehicle constructed to fit inside a desired portion of the machine; a controller operative to control an operation of the remote controlled vehicle; a tether coupled to the controller and to the remote controlled vehicle, wherein the tether is operative to transmit control signals from the controller to the remote controlled vehicle; and an imaging device extending from a front portion of the remote controlled vehicle and operative to view the internal component. The imaging device has a flexible articulating tip spaced apart from the front portion of the body.

Abstract: In aspects, the present invention discloses a method of detecting a rotor fault in an electric machine using a data analysis unit. The method comprises measuring magnetic field strength along a first axis and a second axis, determining operating slip frequency of the electric machine using the measured magnetic field strength along the first axis and the second axis, determining an amplitude of the determined operating slip frequency in a first frequency spectrum and an amplitude of operating slip frequency in a second frequency spectrum, and detecting the rotor fault by comparing the amplitude of the determined operating slip frequency in the first frequency spectrum and the amplitude of operating slip frequency in the second frequency spectrum against a predetermined threshold.

Abstract: In aspects, the present invention discloses a system for monitoring condition of a plurality of motors. The system includes a plurality of condition monitoring devices capable of measuring one or more parameters associated with the corresponding motors, a gateway device coupled to the one or more condition monitoring devices for configuring the one or more condition monitoring devices upon installation and for communicating measurement data from the one or more condition monitoring devices, a server configured to receive measurement data from the gateway device 140 and to detect a condition of at least one motor from the one or more motors, and at least one mobile device capable of configuring the one or more condition monitoring devices, and for displaying one or more alert messages associated with the detected condition of the at least one motor based on a message from the server.

Abstract: In aspects, the present invention discloses a method of detecting a condition of an electric machine using a portable diagnostic device comprising one or more sensors for measuring at least one physical parameter associated with the electric machine in at least two axes. The method comprises measuring the at least one physical parameter associated with electric machine at a first position in a first axis and a second axis, determining a ratio of a first measurement of the at least one physical parameter in the first axis and a second measurement of the at least one physical parameter in the second axis at the first position, identifying a spatial distribution associated with the condition of the electric machine from a database based on the determined ratio and identifying the condition of the electric machine based on the identified spatial distribution.

Abstract: The present invention is concerned with a method for diagnosing the state of electromechanical systems in which electrical rotating machinery is used on the basis of analysis of impedance estimated from at least two currents and two voltages, measured during an operation of the electromechanical system. The method may be especially useful in the condition monitoring of electric motors and generators. The invention combines the information from both the voltage and current signals measurable at the motor terminals. Specifically, the measurements of voltage and current from two or more phases of a polyphase electrical machine are combined to estimate the impedance of the machine, impedance being the resistance to the flow of current that a circuit exhibits when a voltage is applied to it.

Abstract: It is proposed a system for condition monitoring electric machine and the method thereof. The system includes a portable unit, being adapted for free movement around said electric machine; a magnetic field sensor, being adapted for measuring magnetic field intensity at at least one of a plurality points of a path of said free movement; a processing unit, being adapted for receiving at least one corresponding magnetic field intensity signal from said magnetic field sensor, comparing at least one magnetic field intensity value to at least one corresponding expected value, and determining, based on the comparison, if a fault is present in the electric machine; wherein: said magnetic field sensor and said processing unit are integrated into said portable unit.

Abstract: A method and device of determining a fault condition in a synchronous motor including a rotor provided with damper bars and an end ring to which the damper bars are mechanically connected thereby forming a damper cage, wherein the method includes: obtaining a first measurement of an end ring current from a first location along the end ring, processing the first measurement to thereby obtain a processing result, and determining whether a fault condition is present in the synchronous motor based on the processing result.

Abstract: A method for identifying a fault condition in an electrical machine in which at least a stator or a rotor has parallel winding branches is disclosed. A measurement is carried out for obtaining a set of circulating current values between two parallel winding branches of which each winding branch includes a single coil. A frequency analysis is applied on the set of circulating current values to obtain at least one frequency component. A fault condition of the electrical machine is determined on the basis of the at least one frequency component.

Abstract: A method for preventing a frequency component of a voltage from occurring in an electrical machine including the steps of: obtaining, either by measuring a voltage signal or a current signal from the electrical machine in time domain and transforming the measured signal into frequency domain, by simulating or deducing a first frequency component present in the electrical machine in absence of a grounding, the first frequency component representing a first undesired frequency higher than a limit frequency of 500 Hz; and providing the electrical machine with a first grounding at a grounding location, the first grounding including a resonant circuit resonating at the first undesired frequency. In order to get rid of harmful shaft voltages in the form of sharp voltage peaks at high frequencies, it is first necessary to determine at which undesired frequency or frequencies these voltage peaks occur.

Abstract: An inspection system for inspecting an internal component of a machine includes a remote controlled vehicle constructed to fit inside a desired portion of the machine; a controller operative to control an operation of the remote controlled vehicle; a tether coupled to the controller and to the remote controlled vehicle, wherein the tether is operative to transmit control signals from the controller to the remote controlled vehicle; and an imaging device extending from a front portion of the remote controlled vehicle and operative to view the internal component. The imaging device has a flexible articulating tip spaced apart from the front portion of the body.

Abstract: A method and system of determining an electro-mechanical fault condition in a synchronous machine having a stator, a rotor, and exciter. The method includes: a) obtaining an exciter current signal which is a measurement of an exciter current through stationary windings of the exciter, b) transforming the exciter current signal to obtain an exciter current frequency spectrum, and c) determining whether an electro-mechanical fault condition is present, and a type of the electro-mechanical fault condition, based on harmonic content related to the frequency of the stator, of the exciter current frequency spectrum.

Abstract: A method and system of determining an electro-mechanical fault condition in a synchronous machine having a stator, a rotor, and exciter. The method includes: a) obtaining an exciter current signal which is a measurement of an exciter current through stationary windings of the exciter, b) transforming the exciter current signal to obtain an exciter current frequency spectrum, and c) determining whether an electro-mechanical fault condition is present, and a type of the electro-mechanical fault condition, based on harmonic content related to the frequency of the stator, of the exciter current frequency spectrum.

Abstract: In aspects, the present invention discloses a method of detecting a condition of an electric machine using a portable diagnostic device comprising one or more sensors for measuring at least one physical parameter associated with the electric machine in at least two axes. The method comprises measuring the at least one physical parameter associated with electric machine at a first position in a first axis and a second axis, determining a ratio of a first measurement of the at least one physical parameter in the first axis and a second measurement of the at least one physical parameter in the second axis at the first position, identifying a spatial distribution associated with the condition of the electric machine from a database based on the determined ratio and identifying the condition of the electric machine based on the identified spatial distribution.

Abstract: In aspects, the present invention discloses a method of detecting a rotor fault in an electric machine using a data analysis unit. The method comprises measuring magnetic field strength along a first axis and a second axis, determining operating slip frequency of the electric machine using the measured magnetic field strength along the first axis and the second axis, determining an amplitude of the determined operating slip frequency in a first frequency spectrum and an amplitude of operating slip frequency in a second frequency spectrum, and detecting the rotor fault by comparing the amplitude of the determined operating slip frequency in the first frequency spectrum and the amplitude of operating slip frequency in the second frequency spectrum against a predetermined threshold.

Abstract: It is proposed a system for condition monitoring electric machine and the method thereof. The system includes a portable unit, being adapted for free movement around said electric machine; a magnetic field sensor, being adapted for measuring magnetic field intensity at at least one of a plurality points of a path of said free movement; a processing unit, being adapted for receiving at least one corresponding magnetic field intensity signal from said magnetic field sensor, comparing at least one magnetic field intensity value to at least one corresponding expected value, and determining, based on the comparison, if a fault is present in the electric machine; wherein: said magnetic field sensor and said processing unit are integrated into said portable unit.