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7629723 |
Detection of the amount of wear on a motor drive system
A method and a device, respectively, for detecting the amount of wear on the carbon brush drive system of an electrically commutated d.c. motor which is used, for example, in the form of a pump...
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7605712 |
Power generator and power generator auxiliary monitoring
A generator monitoring system and method includes a plurality of sensors ( 12 ) disposed within a generator enclosure ( 18 ) to sense health conditions of a generator ( 10 ) housed within the...
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7592772 |
Stator inter-turn fault detection of synchronous machines
A fault detection system using field current and rotor search coil voltage harmonics is provided. The technology is capable of detecting an inter-turn fault unambiguously and rapidly in a...
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7545163 |
Three phase motor diagnostics and phase voltage feedback utilizing a single A/D input
A motor system utilizes a single feedback output to determine various fault states for a 3-phase motor in a non-operational condition. The same single feedback output may be used to determine the...
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7535372 |
Method for measuring the operating state of a synchronous motor using composite power angle meter
The present invention discloses a method for measuring the operating state of synchronous motor by using composite power angle meter, the method comprising steps of: a) obtaining various signals of...
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7525443 |
Method and apparatus for machine state quantification in machinery management systems
A method for determining a steady state operating condition of a machine includes determining whether a current machine speed of the machine is within a defined range of operation, determining...
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7460022 |
Device for protecting electric motors
A device for the explosion protection of electric motors or similar electrical devices such as pumps, in which the motor has a protective housing and works together with an interconnected sensor...
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7450022 |
Bearing failure identification system
A bearing failure detection system includes a thermal protector switch circuit having a wear strip located within an interior of a motor stator. In response to bearing failure or wear above a...
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7382138 |
System and method for non-destructive testing of rotors
A method is provided for testing an electrical characteristic of a rotor. In one embodiment, the method may include applying current to the rotor, measuring voltage drop between first and second...
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7358640 |
Automotive rotary electric machine
The present invention provides an automotive rotary electric machine enabling brush abrasion limit detection reliability to be increased and stable brush abrasion limit detection indication to be...
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7355520 |
Motor diagnostic indicator
A motor receiving power from a power source. The motor comprises a motor housing, a stator at least partially disposed within the motor housing and supported by the motor housing, a rotor disposed...
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7298282 |
Health monitoring method and system for a permanent magnet device
A method and system for monitoring the performance of a permanent magnet device, such as a motor or generator, and providing early detection of motor performance deterioration. The back...
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7256701 |
Motor driver
A motor driver capable of detecting the insulation deterioration of a motor easily and inexpensively is disclosed. The voltage supplied from an AC power supply ( 1 ) is rectified by a first...
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7245225 |
Failure monitor for motor drive control system
A failure monitor designed to monitor a failure in operation of a motor drive control system. The system works to drive a motor-driven member through an output shaft and includes an angular...
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7183935 |
Method and apparatus for determining motor velocity using edge mode hysteresis with a finite impulse response average filter
A method for determining motor velocity includes generating an edge signal including a plurality of edges. The edge signal indicates rotational travel of a motor. Edge counts in the edge signal...
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7164362 |
Apparatus for driving a brushless motor
A control unit for a brushless motor has an upper-arm current detector for detecting an electric current flowing into an upper-arm switching transistor for driving the brushless motor, and a...
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7161493 |
Brush abrasion detector of vehicle generator
The brush abrasion detector is unnecessary to provide any detecting element for detecting limit of abrasion of a brush in the proximity of the brush. The brush abrasion detector includes: a brush...
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7142125 |
Fan monitoring for failure prediction
A method for monitoring a fan comprises measuring power usage of the fan, determining a derivative of the measured fan power usage, tracking the derivative over time, and predicting impending fan...
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7079039 |
Process and device for testing electric motors, in particular fan motors, for functionality
The invention concerns a device for and a process for testing electric motors, in particular fan motors, for functionality, wherein electromagnetic alternating fields produced by an electric motor...
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7075446 |
Method and apparatus for monitoring motor rotation speed
The invention concerns a method for generating an alarm signal in a motor which comprises a rotor ( 50 ) whose actual rotation speed during operation lies in a normal zone (nSoll, TSoll), can...
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7034706 |
Early warning and problem detection in rotating machinery by monitoring shaft voltage and/or grounding current
A rotating machinery monitor provides a warning that is indicative of a developing problem with the rotating machinery. The rotating machinery monitor has at least one current sensor for detecting...
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7019661 |
Axial bearing wear detection device for canned motor
An axial position detection circuit detects the axial position of a rotor from the difference in voltages generated at axial position detection coils disposed at both ends in the axial direction of...
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6970093 |
Method for configuring the alarm device of an electrical motor and motor for implementing said method
If a motor becomes defective, e.g. stops running, runs too slowly, or becomes too hot, many customers demand the generation of an alarm signal, i.e. ask for an alarm device provided on the motor....
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6950029 |
Airflow blockage detection apparatus for a permanent split-capacitor single-phase fan motor
An airflow blockage detection apparatus for a permanent split-capacitor single-phase cooling fan motor measures and compares electrical currents in main and auxiliary windings of the motor to...
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6911838 |
Online detection of shorted turns in a generator field winding
A method for detecting a shorted turn in a synchronous machine having a rotor using a magnetic flux probe is disclose having the steps of: monitoring a signal from the flux probe during on-line...
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6879260 |
Load indicator
A load indicator for an electric motor, comprising a first means (II, IU, CPU) for repeated determination of the motor load, a second means (CPU) for comparing the current motor load, as determined...
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6842117 |
System and method for monitoring and indicating a condition of a filter element in a fluid delivery system
A filter condition sensing circuit includes current and voltage sensors and a data processor. The current and voltage sensors produce signals indicating magnitudes of electrical current and...
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6771178 |
Method of identifying actuators in a motor-vehicle air-conditioning installation
A flap to be identified is caused to move over the whole of its angular range of travel. The number of motor steps is counted during this movement, and the number of steps counted is compared with...
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6747424 |
Integrated fan speed control and fault detection circuitry
Aspects for integrating speed control and fault detection in a fan assembly are described. The aspects include a fan, a first circuit is coupled to the fan for regulating speed of the fan, and a...
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6707385 |
DC motor rotation speed alarm circuitry
DC motor rotation speed alarm circuitry includes an input node, a connection node, a ground node, a comparison circuit and a signal generator. When the rotation speed of the DC motor changes during...
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6696968 |
Visualization luminous device adapted for electric motors of equipments supplied by the three-phase voltage
The present invention is a visualization luminous device adapted for electric motors of equipments supplied by three-phase voltage, allowing a person to visualize with certainty whether there is...
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6674369 |
Fan control circuit
There is described a circuit for controlling the operation of a fan. The circuit operates to control the speed of the fan and to operate the means to monitor fan malfunctioning.
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6650245 |
Multi-functional hybrid contactor
A multi-functional hybrid contactor has a motor protection function against an abnormal state in addition to the starting, running and stopping of the motor, the same effect as the case that an...
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6529135 |
Integrated electric motor monitor
A method monitors an operational condition of an electric motor, and stores in a memory device general trend, prognostic, diagnostic, and hazardous event information indicative of the motor's...
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6407672 |
Adaptive CPU cooling fan speed monitor device
A device is provided which allows a personal computer user to monitor the operational parameters of the central processing unit's cooling fan. This device, called the CPU cooling fan speed monitor,...
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6384733 |
Temperature monitoring apparatus for microprocessor cooling devices
A temperature monitoring apparatus for microprocessors, having a fan device for producing an air stream for cooling the microprocessor. The temperature of the microprocessor is sensed by means of a...
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6377168 |
Engine operation detecting circuit for a visual display
A timing circuit for providing an output to a microcontroller indicating whether an engine is operating, wherein the engine has a magneto. The circuit includes a triac coupled to the magneto for...
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6288648 |
Apparatus and method for determining a need to change a polishing pad conditioning wheel
The present invention provides a method of manufacturing an integrated circuit using a conditioning wheel status indicator with a polishing apparatus having a conditioning wheel and a polishing...
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6255860 |
Pulse detection circuit, method of operation thereof and fan assembly test circuit employing the same
A pulse detection circuit, a method of operation and a fan assembly test circuit employing the same. In one embodiment, the pulse detection circuit includes a charge pump that receives an input...
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6255955 |
Brush warning indicator and methods for indicating brush wear-out
A brush warning indicator for an electric motor is described. The brush warning indicator includes a contact spring having a non-conductive bushing connected to a conductive member. The contact...
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6225911 |
Information processing apparatus and its control method for cooling inside apparatus with fan
An information processing apparatus includes a fan sensor for detecting a failure of a fan for cooling an inside of the apparatus and for outputting a cooling fan failure signal, a counter for...
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6184795 |
Motor controller having dead ended winding detection capability on a single phase line
Problems associated with delta motors and motor controllers being subjected to the potentially damaging combination of extremely low motor torque and very high overcurrent conditions resulting from...
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6169489 |
Motor winding contamination detector and detection
A method and apparatus for detecting motor contamination utilizes zero-sequence currents in a sensing coil to detect contamination. The detector includes a current transformer comprised of a...
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6163266 |
Fan operation detection circuit for a DC fan and method of operation thereof
For use with a DC fan, a detection circuit and a method of detecting an operational condition thereof. In one embodiment, the detection circuit includes: (1) a sensor, coupled to the DC fan, that...
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6147615 |
Speed detecting device for a direct current motor, and electric fan with a motor speed detecting device
A speed detecting device is adapted for use with a direct current motor, and includes a coupling circuit adapted to be connected electrically to a power input line of the motor, a one-shot circuit,...
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6137418 |
Single channel apparatus for on-line monitoring of three-phase AC motor stator electrical faults
An on-line monitor for electrical faults in the stator of an ac motor has a single di/dt current transformer or three separate di/dt current transformers coupled to the three phase conductors of...
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6133840 |
Apparatus using vibration motor
An apparatus using a vibration motor as a drive source is arranged to inhibit a starting action of the vibration motor when the motor is found to be in a sticking state and not drivable. The...
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6118381 |
Fire detection including an air movement device and pre-condition sensing
A system for the detection of fire in an apparatus or device having a fan and a pump, comprising means 20, 25 for detecting the presence of a pre-condition of fire, control means 30 for...
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6114966 |
Motor having a bearing wear monitoring device
A motor is provided in which zero-point positioning of the stator and rotor in the axial direction is simple. The operation of replacing the rotor or stator can be done easily. A motor is provided...
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6100809 |
Bearing wear detection system
A bearing detection system for an electrical generator (10) includes auxiliary bearings (29) for supporting a rotating shaft (39) upon failure of main bearings (62). The auxiliary bearings (29) are...
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