Matches 1 - 50 out of 129 1 2 3 >


Match Document Document Title
7817062 Surface communication apparatus and method for use with drill string telemetry  
An operation of drilling an earth borehole uses a drilling rig, a drill string of drill pipes having its generally upper end mechanically coupleable with and suspendable from the drilling rig, a...
7737583 Vibration-damping rotor assembly  
A rotor assembly comprising: an inner rotor and an outer rotor for rotating in a magnetic field of a motor, the inner rotor comprising a main inner rotor cavity, and a plurality of first holes...
7687950 Drillstring alternator  
A downhole source of electrical power for drilling tools is driven by the rotation of a drillstring or, if the drillstring is not rotating, by the rotation of a drilling sub. The source consists of...
7514832 Single field rotor motor  
An electric motor having a single field rotor wherein the flux within the rotor is generated by magnetic means located at the end regions of the motor housing such that the flux within the motor...
7296409 Electric motor assisted turbocharger  
A turbocharger comprises a turbine wheel and a compressor wheel mounted to a turbocharger shaft. An electric induction motor is provided for assisting rotation of the compressor wheel in...
6954014 Motor with frequency generator and office automation equipment using same  
The invention relates to a motor with a frequency generator attached thereto, equipped with the frequency generator (FG) for detecting a rotational speed of the motor. The motor with the frequency...
6836028 Segmented arc generator  
A segmented arc generator is adapted to convert mechanical power such as wind or water power into electrical power at a wide range of wind or shaft speeds. A rotor has a plurality of salient poles...
6376957 Alternating current machine  
A generator or a 3-phase motor is arranged to provide multipolar permanent magnet excitation in combination with multipolar reluctance distribution wherein different numbers of poles are used for...
6252325 Switched reluctance motor  
In a switched reluctance motor and control system for such a motor, a rotor comprises four salient poles each having a width of about 50-degrees, and a stator has six salient poles each having a...
6210596 Magnetic ceramic composition and inductor using the composition  
A magnetic ceramic composition containing ferrite serving as a primary component and a sintering aid. The composition can be sintered at low temperature. The sintering aid contains about 2-45 mol %...
6140727 Pulse signal generator  
A pulse signal generator comprises a magnetic element (1) capable of causing a large Barkhausen jump; a detector (2) provided relative to the magnetic element; a magnetic field generator (3)...
6137268 System with limited long-time-averaged battery charging rate  
A battery charging system in which current is averaged over a long time period (seconds) to determine the maximum average charging rate. When the integral of charging current over this long period...
6057622 Direct control of air gap flux in permanent magnet machines  
A method and apparatus for field weakening in PM machines uses field weakening coils (35, 44, 45, 71, 72) to produce flux in one or more stators (34, 49, 63, 64), including a flux which counters...
5894219 Magnetic sensor including a coil surrounding a pair of magnets, for detecting rotary motion  
A device for determining rotary motions generally includes a signal generator with inwardly directed teeth or inwardly directed projections and a double-sided measuring coil which is arranged...
5696442 Rotational velocity sensor ring apparatus and method  
A rotational velocity sensor ring comprising a circular cylindrical body with a radially interior cylindrical surface, a radially exterior cylindrical surface and first and second cylinder ends, a...
5696419 High-efficiency electric power generator  
An electrical generator has a plurality of C-shaped stator members which are made of magnetically permeable material. Each C-shaped stator member includes a respective stator winding, and the...
5508608 Magnetic flux device for measuring rotary motions and for generating an electric alternating signal representative of the rotary motions  
A device for measuring rotary motions having a signal generator ring which rotates with the rotating part and of a double-sided measuring coil. Within the core of the measuring coil there are a...
5416372 Induction type motion sensor  
The sensitivity of an induction-type motion sensor having a magnetic circuit with a permanent magnet to small movements is increased by the use of a stator with a core containing a permanent magnet...
5376851 Variable reluctance motor with full and short pitch windings  
A variable reluctance drive system including a motor and corresponding converter for improved current commutation is described. The motor incorporates a salient pole rotor and a salient pole stator...
5291130 Vehicle wheel speed sensor employing an adaptable rotor cap  
A vehicle wheel speed sensor incorporated on an axle spindle hub and hub cap assembly of the type using permanent magnets to generate a magnetic field having a magnetic path conducted through a...
5281911 Vehicle wheel speed sensor employing a locating plate  
A vehicle wheel speed sensor of the type using permanent magnets to generate a magnetic field having a magnetic path which is conducted through a plurality of teeth on a rotor into a plurality of...
5124602 DC motor unit with a rotational speed detector  
A d.c. motor unit with a rotational speed detector comprising a d.c. motor (1) having an output end and an idle end, and a rotational speed detector (14) water-tightly attached to the motor output...
5059884 Variable reluctance motor providing holding torque  
A variable reluctance motor (10, 100, 200) for providing holding torque in accordance with the invention includes a magnetically permeable rotor (12); a stator (18) axially aligned with the rotor...
5057727 Shaft position sensor employing a wiegand-effect device  
A Wiegand-effect shaft position sensor is excited by an alternating magnetic field generated by stationary magnets or solenoids interacting with a high-strength, toothed wheel that is fixed to the...
5045784 Tachometer noise reduction system using a pickup coil to cancel the noise from the tachometer signal  
A current carrying drive coil in a magnetic field is moved by the field. An attached tachometer coil, passing through the same field, produces a voltage from which the speed of the coils may be...
5023547 Variable reluctance rotation sensor with changing flux linkages and including a pair of oppositely poled magnets  
A variable reluctance rotation sensor comprises a rotatable toothed wheel and a magnetic pickup assembly comprising a pair of permanent magnets each having a pair of poles with an opposite one of...
4989574 Electromagnetic pickup  
An electromagnetic pickup has a coil and a core. A noise shielding cylindrical member of magnetic material is provided around the coil to form an open magnetic circuit between the noise shielding...
4977372 Tachometer device having limiting means for limiting frequency variations  
A tachometer device having a sensor generating an electrical signal at a frequency which is proportional to a speed to be detected, an operating drive member, and electrical link means connecting...
4940937 Pulse generating ring for electromagnetic rotary position detection  
A pulser ring has cylindrical inner and outer rings nested together. The inner ring is formed at its one end with protrusions arranged at equal angular intervals. The outer ring is in the shape of...
4937522 Speed sensor pickup assembly with slotted magnet  
A dual speed sensor pickup assembly (140) for sensing the rotational velocity of two independently rotatable, closely axially spaced exciter rotors (116 and 118) is provided. The pickup assembly...
4853575 Tachometer generator  
A tachometer generator of the inductive pickup variety is disclosed, particularly adapted to be mounted in close proximity with a rotating multipole permanent magnet structure. The coil produces a...
4849728 Induction generator  
The invention provides an iduction generator comprising a plastic injection-molded housing having a port and one or more pole shoe(s) associated with a permanent magnet. A plastic bobbin inserted...
4829834 Speed and torque sensors  
A speed and torque sensor has a permanent magnet and a pole piece about which are wound together a torque coil and two speed coils and identical with the torque coil. The coils and permanent magnet...
4795278 Bearing assembly  
A bearing assembly comprising a bearing including an inner and outer rings one of which is fixed to a rotating member, and a pulser gear fixed to the rotating member. The pulser gear is composed of...
4755703 Electric motor  
The invention relates to improvement of a motor with a rotor including a permanent magnet. The motor comprises a yoke of soft magnetic material, a plurality of field poles each having a field core...
4721864 Inductive pulse generator  
An inductive pulse generator for converting a rotary movement into a frequency proportional therewith. The pulse generator includes a measuring wheel (1) provided with poles (3) of magnetic...
RE32520 Magnetic probe  
A magnetic probe for sensing the passage of a moving magnetic element, comprising a radially magnetized cylindrical permanent magnet, formed of a flat sheet of elastomer bonded ferrite material...
4659953 Magnetic structure for synchro and tachometer  
A magnetic structure including a stator including sensor windings and a field exciter, and a movable armature having a variety of applications, including a synchro resolver and a tachometer. The...
4647892 Dual magnetic sensor  
A dual magnetic sensor utilizing a pair of separate coils to generate separate and isolated signals from a single pickup point, each signal having a power output at least equal to that of a...
4639626 Permanent magnet variable reluctance generator  
A variable magnetic reluctance generator is disclosed generally comprising a stator having pairs of spaced magnetic poles of opposite polarity. Like polarity poles are adjacent one another to...
4636674 Linear flux switch alternator  
A stator adapted for mounting adjacent the periphery of a moving machine gear, whereby the gear serves as a rotor in an electric alternator. A pair of elongated pole pieces are mounted in parallel...
4626781 Device for detecting the speed of rotation and/or an angle of rotation of a shaft  
A device for detecting the speed of rotation and/or an angle of rotation of a shaft having a motion transmitter which rotates with the shaft, the device consisting of a magnetic-field-dependent...
4596973 Inductive transmitter  
An inductive transmitter has a housing 1 within which two pole shoes 8, a permanent magnet 7 arranged between the pole shoes 8 and a coil 6 surrounding the permanent magnet 7 and the pole shoes 8...
4567376 Signal generator  
In a signal generator with a magnetic rest, consisting of a ferromagnetic studded disk (13) with a U-shaped part (6) consisting of a permanent magnet (3) and lateral ferromagnetic small plates...
4567407 Biased unitized motor alternator with stationary armature and field  
A unitized (single unit) motor and flux switch alternator having stationary field, armature and motor windings which provides a magnetic path for some of the motor input power to feed through and...
4538082 High-output magnetic field transducer  
To increase the output amplitude obtained from Wiegand wire transducers, for example of the type used in contactless ignition breaker systems, a flux concentration or flux guide element (3) of...
4503348 Magnetic transducer  
An electromagnetic transducer which generates signals on the basis of the Barkhausen effect under periodically alternating externally applied magnetic switching fields. Prior to use, the magnetic...
4480324 Constant beamwidth frequency independent acoustic antenna  
A frequency independent log periodic acoustic device is utilized for the transmission or reception of underwater sound. A key element of the device is a particularly shaped plate or diaphragm,...
RE31199 Magnetic speed sensor  
A speed sensor for a vehicle wheel has a rotating tone wheel with a stationary magnetic sensor having a pair of sensing poles positioned proximate the tone wheel teeth. Coil means are wound on the...
4355251 Tachometric generator  
Several embodiments of tachometers generators for use in controlling the speed of electrical motor driven tools. In each embodiment a toothed rotor (28, 52, 72, 92, 122) is fixed for rotation with...
Matches 1 - 50 out of 129 1 2 3 >