38results about How to "Fault detection" patented technology

A state monitoring system of a wind power generator (10) is provided with: a sensor that detects the state of a yaw bearing; a monitoring apparatus (80) that generates diagnostic parameters on the basis of the detection results from this sensor; a sensor that detects rotation angular velocities of a nacelle and a main shaft; and a data server (330) that diagnoses a fault in the yaw bearing on the basis of the diagnostic parameters. The data server (330) diagnoses whether or not there is a fault in the yaw bearing on the basis of changes in the diagnostic parameters from initial values thereof when the rotation angular velocity of the nacelle falls within a non-zero first predetermined range and the rotation angular velocity of the main shaft falls within a second predetermined range.

An improved filter assembly (1) is disclosed, particularly for electric cabinets, comprising a filter cloth (5), a conveying sump (7) and a fan (9), equipped with at least one thermal-resistive sensor (11) placed next to at least one hole (13) obtained in the conveying sump (7).

The present invention provides an elevator apparatus and a program capable of detecting troubles of a position detector without setting a restriction on an installation position of a position detection component. The elevator apparatus includes a car position detection circuit that detects movement amount of the car from the departure floor based on a signal output from a signal generator that outputs signals corresponding to rotation of a rotating body; a position detection component correspondingly arranged in a lifting hoistway; a position detector arranged on the car to detect the positiondetection component; a height storage unit in which relationships between the floors and the height from a reference floor are stored; and a floor detection circuit that detects, based on the movement amount of the car from the departure floor and the relationships between the floors and the height from a reference floor; and a failure determination circuit that obtains detection results of the floor detection circuit and the position detector, and based on the number of floors through which the car moves and the number of position detection components detected by the position detector, determines failure of the position detector.

The invention relates to an automatic monitoring and fault positioning system of a single-fiber three-way multiplexer, which comprises a first sampling circuit, a second sampling circuit, a third sampling circuit and a fourth sampling circuit, wherein the first sampling circuit is used for sampling an optical signal at the front end of the detected single-fiber three-way multiplexer, and the second sampling circuit, the third sampling circuit and the fourth sampling circuit are respectively used for sampling signals with the wavelengths of 1550nm, 1490nm and 1310nm at the rear end of the detected single-fiber three-way multiplexer; the first to the fourth sampling circuits are connected with a central controller, and the central controller is used for reading the numerical value of each sampling circuit and finishing the judging and positioning working of faults. The fault of the single-fiber three-way multiplexer can be detected in real time.

The invention discloses a low-voltage circuit breaker. The low-voltage circuit breaker comprises a shell, a contract system which is connected with a circuit, a tripping mechanism which drives the contact system to break the circuit and an arc-extinguishing device which conducts arc extinguishing on the contact system, the tripping mechanism comprises a circuit module which detects circuit faults and an operation module which drives the contact system to break the circuit, the operation module comprises an electromagnetic component and an action component, the electromagnetic component is connected with the circuit module in a coupled mode, and when the circuit breaker is tripped, the circuit module drives the electromagnetic component to drive the action system to make the contact system break the circuit. According to the low-voltage circuit breaker, by means of the arrangement of the circuit module, the circuit faults can be effectively detected; by means of the the arrangement of the electromagnetic component and the action component, when the circuit module detects the circuit faults, the electromagnetic component and the action component can effectively drive the contact system to break the circuit, and the influences of the environment and the temperature do not exist.

The invention belongs to the field of electric appliance control, in particular to an AC / DC fan control device. Compared with the traditional fan control circuit, the signal input terminal, the first optocoupler relay and the second optocoupler relay are added, and the signal input terminal is connected to the first integrated chip through the first optocoupler relay to realize pulse speed regulation input. An integrated chip adjusts the rotation speed of the motor according to the duty cycle of the pulse. The higher the duty cycle, the faster the speed. On the contrary, the lower the duty cycle, the slower the speed. It can be adjusted from stop to full speed; The relay is connected to the signal input terminal to send parameters such as the motor’s rotation speed to the signal input terminal. By comparing the signal sent by the signal input terminal with the feedback signal, the fault detection of the motor can be realized.