Abstract: An apparatus and method of determine rotor position for a switched reluctance motor is claimed. A phase voltage and a phase current are measured. An estimated flux voltage value is determined from the measured phase voltage and the phase current. The phase current is again measured when the estimated flux linkage value is approximately equal to a reference flux linkage value. Rotor position is determined based on the reference flux linkage value and the measured phase current value.

Abstract: The driving ring magnet 2 of 4 n magnetic poles is allocated on the rotor 1. 3 m flat coils 5 are allocated on the stator 3 with surrounding the FG (Frequency Generator) pattern 4. Each flat coil 5 is allocated in the distance of (5/3).pi. of the electrical angle with being adjacent to each other. The magnetic sensor 6 is allocated in the area 20 of the maximum spacing area between the flat coils 5.

Abstract: A system and method are provided for measuring rate of rotation. A brushless DC motor is rotated and produces a back electromagnetic force (emf) on each winding thereof. Each winding's back-emf is squared. The squared outputs associated with each winding are combined, with the square root being taken of such combination, to produce a DC output proportional only to the rate of rotation of the motor's shaft.

Abstract: A contactless electronic control system particularly adapted to drive a motorized wheel hub includes a tubular bracket and a tubular grip member encircling the bracket and connected thereto by a rotary connection so that the grip member can rotate about the bracket. A ring magnet having diametrically opposite poles is mounted in the grip member for rotation therewith and a Hall Effect device is mounted to the bracket. When the grip member is rotated in one direction so as to move one of the poles toward the device, the device produces a proportional positive electrical signal and when the grip members rotated relatively in the opposite direction so as to move the other of the poles toward the device, the device produces a proportional negative signal. Preferably, the magnet is positioned between concentric inner and outer pole pieces and the grip member is biased to a home position which locates the magnets poles on opposite sides of the sensor.

Abstract: 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) provided in vicinity of the magnetic element for applying a biasing magnetic field to the magnetic element for making a predetermined magnetization; and a magnetic circuit forming unit (4) provided in vicinity of the magnetic element for applying a main magnetic field to the magnetic element for causing a large Barkhausen jump in the magnetic element. The magnetic field generator is provided with magnetic field concentration means (32A) for concentrating the biasing magnetic field upon the magnetic element and the magnetic field adjusting means (74) for adjusting an intensity of the biasing magnetic field upon the magnetic element.

Abstract: The present invention provides a high pressure pump (1), which comprises an electric motor (2) having a through-hole in axial direction on a rotation shaft (5), a thrust transmission shaft (8) engaged with threads of a rotation nut (6) operated by rotation of the motor, passing through the through-hole and performing linear reciprocal movement, plungers (9a, 9b) performing reciprocal movement in cylinders and connected to at least one end of the thrust transmission shaft (8), and a stress-strain sensor (16) provided on at least one of the plunger or the thrust transmission shaft.

Abstract: In a VR-type resolver which is used in combination with a motor to detect the rotation position of the motor, the teeth number of a rotor of the resolver is reduced over the teeth number of a rotor of the motor. Also, the shape of the teeth of the resolver rotor is simplified into a curved shape such as a sine wave shape. Further, in another type of VR-type resolver, the number of the magnetic poles of the stator with respect to the number of the teeth of the rotor is set as a number being capable of satisfying not only the condition that it is a multiple of the phase number N and an even number but also the condition that it is a number which can be calculated according to one of the following expressions (1) and (2), that is,stator pole number=rotor teeth number/(M+1/N) (1)stator pole number=rotor teeth number/{M+(N-1)/N} (2),where M is an integral number of one of 1, 2, and 3.

Abstract: A brushless commutated torque motor suitable for use with a rotary low frequency sound reproducing apparatus, includes a shaft having a longitudinal axis, a position sensor, a rotor having a plurality of permanently magnetized rotor pole sectors, the rotor being mounted for rotation upon the shaft, and a stator having a plurality of stator poles and stator winding slots disposed alternately therein, the stator slots having stator windings therein driven by individual power amplifiers in response to a control signal, the stator having commutation between stator windings controlled by sensing of rotor angular position by the position sensor, with each rotor pole sector being configured and disposed such that a plurality of stator poles are axially adjacent to each rotor pole sector and each rotor pole sector is angularly separated from adjacent rotor pole sectors by a selective number of stator poles.

Abstract: The invention is based on an electrically operated motor, having a shaft with a magnet rotor body, the RPM of the shaft can be picked up by a Hall sensor disposed on a circuit board. The circuit board is embodied with soldered pins or contact shoes and is integrated into a component of the motor, and that contacts, supply and signal lines for the circuit board are injected and/or plugged into the component of the motor.

Abstract: According to the present invention, a zero-speed rotary pulse generator is disclosed. The zero-speed rotary pulse generator detects and counts shaft rotation of DC motors. The invention measures the rotation of a shaft by being coupled to a disc-shaped magnet having alternating polarity on its face. The magnet rotates at the same speed as the motor. Positioned close to the rotating magnet is a Hall effect device that can sense the alternating magnet polarity as the shaft rotates. The Hall effect device provides a digital output based upon the direction and the strength of the magnetic field it senses.

Abstract: A drive system is described that uses an electric motor and a rotary angle measuring system. The measuring system shaft is supported in roller bearings in a stator which is supported relative to the electric motor in a nonrotatable fashion by means of a stator coupling. The measuring system shaft is rigidly mounted on the end of motor shaft. The rotary angle measuring system thus assumes support of motor shaft at the B end.

Abstract: A brushless motor includes motor holder having a plate, a stator attached to the plate and a rotor having a rotary shaft. The rotary shaft has a lower end that protrudes from the stator. A sensor magnet is located near the lower end of the rotary shaft. The plate has a through hole through which the sensor magnet passes. This structure allows a unit including the stator, the rotor and the sensor magnet to be pre-assembled. The unit is then secured to the motor holder. This permits a set of standardized parts to be attached to a non-standard part in one step, which makes assembly more efficient.

Abstract: A positioning device for a miniature fan includes a coil seat having an axle tube, an upper polar plate assembly, a lower polar plate assembly, and a winding mounted between the upper polar plate assembly and the lower polar plate assembly. A circuit board is mounted to the axle tube and includes a sensor element for activating rotor. The sensor element is located on a line extending from an end edge of the upper polar plate assembly along a direction parallel to a longitudinal axis of the axle tube.

Abstract: A positioning device for a miniature fan includes a coil seat having an axle tube, an upper polar plate assembly, a lower polar plate assembly, and a winding mounted between the upper polar plate assembly and the lower polar plate assembly. A circuit board is mounted to the axle tube and includes a sensor element for activating a rotor. The sensor element is located on a vertical line extending from an end edge of the lower polar plate assembly along a direction parallel to a longitudinal axis of the axle tube.

Abstract: In a rotating machine with employment of a sensor-less DC brushless motor, a terminal voltage of a motor is corrected in a phase corrector by using a motor phase current signal. At this time, the terminal voltage is processed in an integrator and a comparator so as to be converted into an ON/OFF signal having a duty ratio of 1:1. Then, a rotation signal is produced based on an induced voltage which is generated by rotating a permanent magnet rotor, so that a rotation sensor is no longer required. On the other hand, an output derived from the phase corrector is entered as a 1-pulse/1-rotation output signal into a PLL circuit. The PLL circuit contains a phase comparator, a low-pass filter, an oscillator, and a counter. The PLL circuit frequency-divides the 1-pulse/1-rotation output signal. The sine wave data are stored into a ROM with respect to each of the frequency-divided signal positions. The unbalance vibrations of the magnetic bearing are controlled every frequency-divided signal.

Abstract: An arrangement for the determination of the temperature of a direct-current motor. The temperature is determined in an indirect manner from the temperature-dependent armature resistance, with the armature resistance being determined as the quotient of the voltage being applied to and measured at the motor terminals and of the blocking current of the armature, and being set in relation to the respective temperature. The current signal determined from the current flowing within the armature is averaged with adjustable, calculated integration times with the aid of an integrator that can be controlled by a microcontroller. The arrangement, can be used for the indirect determination of the rpm rate (N) and/or variations that are critical or of interest in the rpm rate of the motor. The rpm rate is proportional to the voltage (U.sub.ind) induced within the armature, taking into consideration a motor-typical proportionality constant (.kappa.) according to equation N=.kappa. U.sub.

Abstract: A drive assembly for driving an adjustable unit in a motor vehicle includes a motor/transmission and an associated control unit. The motor/transmission is suitable for adjusting an adjustable part in a motor vehicle for normal applications. The transmission is driven by the motor to adjust the adjustable part. The motor and the transmission are separated by an interface region. The motor includes a magnetic field generator for generating an alternating magnetic field as the motor drives the transmission. The control unit can be readily connected to the motor/transmission for controlling the adjustment of the adjustable part for more advanced applications. To be readily connected to the motor/transmission, the control unit includes a profiled projection having a hollow chamber. A magnetic sensor is positioned inside the hollow chamber.

Abstract: A microelectric motor has a housing and a rotatable motor shaft extending axially in the housing. The housing has an axial length. A rotor is fastened to the motor shaft and a stator is positioned in the housing for cooperating with the rotor. A receiving chamber is provided in the housing within its axial length. The transducer is positioned in the receiving chamber.

Abstract: A housing assembly for an electrical device (such as an electronic circuit) is disclosed in which a support member is provided in a compartment to physically divide a componentry sensitive to such radiation. In a preferred embodiment, an electric power-assisted steering system is disclosed of the kind in which an electric motor (12) is connected through a gearbox to an output shaft operatively connected to a steering column of the vehicle and in which a one-piece housing (1) is provided which defines two discrete compartments (2, 3). A first compartment (3) is adapted to house the motor and the gearbox, and a second compartment (2) is adapted to house a motor control circuit and a motor drive circuit, a support member (21) being adapted to provide a physical banner between the two circuits. The one-piece housing (1) is advantageous in that it reduces the number of potential openings through which electromagnetic radiation may pass compared with providing multiple housings.

Abstract: A motor actuator has a position detector provided with a pulse plate made of resin and a sliding contact. The pulse plate has a first conductive unit and a second conductive unit. The sliding contact has an input contact and an output contact. The first conductive unit makes contact with the input contact and the second conductive unit makes contact with the output contact so that a pulse signal is obtained by rotation of the pulse plate. A plurality of slit portions are formed on the first conductive unit by exposing the resin material of the pulse plate so that grease is collected in a boundary portion of each of the slit portions due to a difference in thickness between the slit portions and a conductive portion of the first conductive unit.

Abstract: A coil assembly for sensorless rotor angular position control of a single phase permanent magnet motor. The coil assembly is positioned axially adjacent one end of the motor's rotor core in magnetic coupling relationship with the rotor and substantially independent of the magnetic coupling relationship between the main winding of the motor's stator and rotor. The coil assembly comprises a coil of wire and a coil fixture for holding the coil of wire.

Abstract: A brushless D.C. motor assembly includes a balancing sheet made of material with magnetic conductivity, the balancing sheet having an axle hole joined together with a stator by an axle tube, a rotor rotatably received in the axle tube, the rotation thereof controlled by a controlling device, and the rotor having a annular permanent magnet with a diameter substantially the same as the diameter of the balancing sheet wherein the permanent magnet and the balancing sheet attract each other.

Abstract: An electronically commutated external rotor motor has an external rotor having a cup-shaped housing and a radially magnetized permanent magnet connected in the cup-shaped housing. An interior stator is positioned in the cup-shaped housing. The interior stator has a laminated core having grooves. Windings are provided within the grooves. The windings have first end turns proximal to a bottom of the cup-shaped housing and second end turns positioned distal to the bottom. The first and second end turns electrically connect the windings to one another. The permanent magnet has an end face remote from the bottom of the cup-shaped housing. At least one galvano-magnetic rotor position sensor is arranged opposite the end face of the permanent magnet so as to be located within a magnetic leakage of the permanent magnet and within a magnetic leakage of the interior stator. The at least one rotor position sensor is designed to control current within at least a portion of the windings.

Abstract: An actuator for an HVAC system includes a motor coupled by an electrically operated clutch to a gear train which drives an output connector. A spring is connected to the transmission to drive the output connector to a normal position in the event of a power failure. A control apparatus is connected to the transmission and provides the combined functions of a magnetic eddy current brake and a motion sensor.

Abstract: A shaft-mounted electronic sensor with an independent, rotating power supply, and a method for powering shaft-mounted electronic sensors by harnessing the energy present in the residual magnetic fields present in the permanent magnet armature windings of a generator or motor. Windings are placed on the shaft of a rotating machine such as a synchronous motor or generator that uses a permanent magnet generator for supplying exciter field power via a regulator. These windings are placed such that they rotate with the shaft and break the lines of flux produced in the permanent magnet stationary armature windings. Breaking the lines of flux induces a current in the windings of the invention which is used to power an electronic sensor mounted on the shaft.

Abstract: A rotor position transducer for an electronically commutated electric motor has a vane mounted to rotate with the rotor and a pair of sensors, according to one embodiment. One sensor has an output coincident with positions of zero torque. The other sensor produces signals slightly in advance. Overlapping portions of the signals denote regions of different levels of torque. The second sensor output can also be used in high-speed, single-pulse control of the motor. Method embodiments and other apparatus embodiments are also disclosed.

Abstract: In a motor having a rotation detection sensor, a Hall IC device for generating an output signal indicative of rotation of a motor rotary shaft is accommodated within a casing. The casing is formed into a longitudinal shape, and is sandwiched between a motor and housing attached to the motor. The casing extends perpendicularly to the rotary shaft in the housing.

Abstract: A system and method are provided for measuring rate of rotation. A brushless DC motor is rotated and produces a back electromagnetic force (emf) on each winding thereof. Each winding's back-emf is integrated and multiplied by the back-emf associated with an adjacent winding. The multiplied outputs associated with each winding are combined to produce a directionally sensitive DC output proportional only to the rate of rotation of the motor's shaft.

Abstract: A motor structure in a salient pole type DC motor in which torque ripple and cogging torque are reduced, without deceasing motor efficiency, and the torque constant and irregularity of the rotation are reduced. The magnetic flux density distribution of an air gap approaches a sine wave shape by forming a groove in the vicinity of the neutral part (a boundary of an N-pole and an S-pole) of a rotor magnet.

Abstract: The invention relates to a motor which comprises a drive system which has a stator (10) and a rotor (14), and a control system which controls the drive system and has circuit boards (21), (22), both being housed in a casing (2), wherein the casing (2) has a first conductive pin (25) for flowing a current to input power to the control system and a second conductive pin (26) for flowing a current to output from the control system to respective phases of a coil, and the circuit boards are supported by the first and second conductive pins. And, the invention relates to a method of manufacturing a motor which comprises the steps of using a first die (101) and a second die (102) which are mutually connected with a die split face (104) therebetween and a third die (103) which is inserted in the middle of the first and second dies, inserting and fixing a motor stator, a metallic cylinder and embedding members into a cavity formed by the first, second and third dies, and pouring a molten resin to effect resin molding.

Abstract: A vacuum pump a the magnetic bearing assembly includes the magnetic bearing assembly with rotor position sensors and backup bearings being placed inside the rotatable shaft of the vacuum pump. The sensor placements are independent of the bearing position, so that the respective radial sensors can be at the same axial position as the respective radial bearings, which provides sensors co-location and a space saving within a turbopump housing, in particular, in its axial direction, while sensors and mechanical backup bearings are placed in a better protected area with respect to pumped corrosive gases.

Abstract: A drive device has an electric motor having a rotor, a rotor shaft rotatable by the rotor, a ring magnet which is rotatable during the operation of the electric motor and having at least one North pole and one South pole, a hall sensor oriented to the ring motor, the ring motor being rotatably supported at a distance from the rotor shaft near the rotor shaft, and a drive wheel arranged on the rotor shaft, the ring magnet being in a driving connection with the drive wheel, the drive wheel having a diameter which is a greater than a diameter of the ring magnet.

Abstract: A dynamoelectric machine having a wire retaining device constructed to frictionally retain the quadrature winding to allow automated winding of the quadrature winding. The wire retaining device includes stator end caps having integrally formed wire retention elements at the radially inner end of the stator tooth. The wire retaining device frictionally holds the wire in place as the quadrature winding is automatically wound about the stator. In addition, the stator end caps electrically insulate the quadrature winding from the stator and the main winding.

Abstract: A stator assembly operated in a 2-phase drive manner including first and second stator coils wound in a star shape with a plurality of projections and a plurality of grooves, and arranged with a predetermined phase difference; and an annular supporting body into which the first and second stator coils are inserted for supporting the coils, insulating them from each other. Each stator coil includes four projections and four grooves, and there is a phase difference .theta. between the first and second stator coils, the difference determined by the following equation: .theta.=360/2P.+-.360/P, wherein P denotes the number of a rotor's magnetic poles.

Abstract: A rotary motor and a rotary magnetic bearing are integrated in a compact assembly that is contact-less. A stator assembly surrounds a ferromagnetic rotor with an annular air gap which can accommodate a cylindrical wall, e.g. of a chamber for semiconductor wafer processing. The stator assembly has a permanent magnet or magnets sandwiched between vertically spaced magnetic stator plates with plural pole segments. The rotor is preferably a ring of a magnetic stainless steel with complementary pole teeth. The stator assembly (i) levitates and passively centers the rotor along a vertical axis and against tilt about either horizontal axis, (ii) provides a radial position bias for the rotor, and (iii) establishes a motor flux field at the rotor poles. Polyphase coils wound on the stator plates produce a rotating flux field that drives the rotor as a synchronous homopolar motor. A rotor without pole teeth allows operation with an asynchronous inductive drive.

Abstract: An electric motor with a sensor, in particular an rpm sensor, is proposed. The sensor contains at least one means (20), generating a magnetic field, as the signal emitter, at least one magnetic field sensor (28, 30) as the signal receiver, and signal conducting means (22, 24, 26). The signal conducting means (22, 24, 26) contain magnetically conducting material and conduct the signal of the at least one magnetic field-generating means (20) to the at least one magnetic field sensor (28, 30). At least one current conducting means (40, 42, 44) is arranged essentially along the signal conducting means (22, 24, 26).

Abstract: A rotating machine includes an endshield assembly, a stator assembly, and a rotor assembly including a shaft. The endshield assembly includes an endwall having a substantially planar surface and a cylindrical endshield protrusion projecting along a longitudinal axis substantially perpendicular to the planar surface from a substantially central position on the endwall. The stator assembly is connected to the endshield assembly and has a substantially cylindrical main body extending from the endwall along the longitudinal axis substantially perpendicular to the planar surface. The rotor assembly is positioned within a central cavity of the stator assembly and arranged for rotation relative to the stator assembly. The shaft extends from the rotor assembly and passes through the cylindrical endshield protrusion. An outer surface of the shaft and an inner surface of the cylindrical endshield protrusion form a hydrodynamic bearing when the rotating machine is immersed in fluid.

Abstract: Transducer, in particular clockwork driving motor, comprising a stator (2) formed of two stator parts (16 and 26) and three cores (18, 19, 20) connecting respectively three magnetic poles (28, 29, 30), defined by the first stator part (16), to the second stator part (26) used to close the magnetic paths of the transducer. The coils (22 and 24) are used to supply the transducer to drive in rotation respectively the two rotors (4 and 6). The coil (23) is connected to detection means (72) used for detecting the rotation of one or other of the two rotors (4 and 6), and in particular, for detecting zero crossing of the induced voltage (or similarly of the induced current) in the coil (23). Detection of zero crossing of the induced voltage is used to provide input signals to the supply means (70) to control driving of the rotors (4 and 6) in an efficient and reliable manner, in particular in a rapid or continuous operating mode, whether in a forward or backward rotational direction.

Abstract: A dynamoelectric machine includes a stator having a stator core. A winding is provided on the stator core and the stator core has a stator bore. A rotor including a rotor core is received in the stator bore. A permanent magnet is mounted on the rotor core periphery and a rotor shaft is mounted on the rotor core. Bearing means are provided for supporting the rotor shaft for rotation relative to the stator. A first circuit board having electrical components thereon is used in operating the dynamoelectric machine, and a second circuit board having an electrical component in the form of a sensing device thereon is used in determining the position of the rotor. The first circuit board is constructed for mounting the second circuit board thereon so that the second circuit board projects axially inwardly from the first circuit board and the sensing device is disposed in an axial position overlapping the axial position of the permanent magnet.

Abstract: A miniature heat-dissipating fan includes a stator seat having a winding wound therearound and an axle tube for rotatably receiving a rotor shaft. A circuit board is mounted around the axle tube and includes a straight edge. The circuit board further includes a number of leads each having an end led to the straight edge. A Hall element has a number of pins respectively connected to the leads of the circuit board, the pins being bendable along the straight edge of the circuit board.

Abstract: A motor provided with a rotational-speed detector has a driving coil for driving the motor, a driving magnetized portion, a rotational-speed detecting magnetized portion, and a detecting pattern. An even number of blocks of the detecting patterns having detecting lines are provided. A pair of blocks are displaced from each other in the rotating direction in relation to the arrangement of the N poles and the S poles of the rotational-speed detecting magnetized portion by an amount equal to one pitch between the detecting lines. An adder for adding currents flowing in the detecting lines of the respective blocks is provided. Alternatively, a subtracter for calculating a difference between currents flowing in the above-mentioned detecting lines is provided. Due to magnetic flux from the driving coil, noise currents are generated in the connecting lines for connecting the detecting line. However, noise currents IA and IB generated in the respective blocks A and B cancel each other.

Abstract: A motor unit capable of preventing a sensor magnet made to rotate in synchronization with its output shaft from being supported in an inclined condition with respect to a case cover. The sensor magnet and the output shaft are coupled to each other through a first holder fitted to the output shaft so as to rotate integrally with the output shaft, a second holder fitted to the sensor magnet so as to rotate integrally with the sensor magnet and rotatably supported by the case cover, and an elastic member placed between the first holder and the second holder and including axially extending engaging leg portions and radially recessed engaging catch portions respectively engaging with the first holder and the second holder without looseness in the circumferential direction.

Abstract: In an electric motor having a rotation detection sensor, a pair of engagement recesses are provided on an axial end surface of a resin cylindrical body of a commutator. A permanent magnet is held around a rotary shaft of the motor with its one axial end surface being in abutment with the axial end surface of the cylindrical body. A pair of engagement recesses is provided on the other axial end surface of the magnet. A resin busing having a cylindrical part and a disk part is fitted on the rotary shaft at the side of the other axial end surface of the magnet. A pair of engagement protrusions is formed on the cylindrical part to be engaged with the engagement recesses of the cylindrical body, thereby restricting a relative movement between the bushing and the cylindrical body. Further, a pair of engagement protrusions is formed on the disk part to be engaged with the engagement recesses of the magnet, thereby restricting a relative movement between the bushing and the magnet.

Abstract: An improved design for a switched reluctance motor is disclosed that keeps the motor cool during operation and thereby improves the performance and reliability of the motor. The improved design employs three centrifugal fans mounted to the motor shaft, which are used to create two independent airflow paths, one of which cools the electronic components of the motor. The improved design also divides the functions performed by a single printed circuit board into two circuit boards, an upper circuit board and a lower circuit board. Another feature of the improved design includes locating the position/speed sensing encoder immediately below one of the centrifugal cooling fans. The disclosed construction provides for increased dissipation of heat that is generated by the motor and its electronic components. In this configuration, the printed circuit boards and other electronic components are located in such a manner that air can be circulated in a path to remove heat from these components.

Abstract: Systems and apparatus for integrating an air switch and a power cord into an electric motor, and methods for assembling an electric motor including an integral air switch and an integral power cord, are described. In one embodiment, an air switch and a power cord are incorporated into an electric motor. No additional removable cover is required for the switch and cord. To eliminate the motor centrifugal switch, an air switch is provided to control energization and de-energization of the motor windings. The air switch includes a snap action switch to cut-out the start winding used for ensuring that the rotor has sufficient starting torque.

Abstract: A two-phase brushless direct-current (BLDC) motor having a single Hall effect device. The BLDC motor includes a stator comprised of 2n coils grouping as first and second phase coils at a uniform interval, and a rotor which N-pole and S-pole magnets of the same number as that of the stator coils are alternately disposed, the 2n magnets forming n pairs, each pair of magnets are disposed at a uniform interval, wherein a distant ratio from the center of one N-pole magnet to the centers of the S-pole magnets adjacent the N-pole magnet is established into 1:1.4. Since 2n auxiliary magnets are disposed annularly on the rotor with the same length as each other corresponding to the N-pole and S-pole magnets, a single Hall effect device detects the magnetic pole by magnetic flux of the rotating auxiliary magnets and generates the rotating position signal of the rotor, so that a switching controller can activate the first and second phase coils alternately.

Abstract: A fault-tolerant control system for a magnetic bearing arrangement which maximizes dynamic response of the control system is disclosed. The arrangement includes a main digital signal processor responsive to rotor position/velocity signals to supply control signals to bearing control coils and a secondary digital signal processor responsive to accelerometer signals to provide open-loop vibration control for correction of mass imbalance of the rotor system. In addition, sources of vibration which have fundamental frequencies at some multiple of the rotor system rotational frequency can also be controlled.

Abstract: A dynamoelectric machine has a stator end cap mounted on a stator core, which attaches a control circuit board directly onto the stator. The end cap has integrally formed fingers which permit snap on connection of the circuit board. Guide pins make certain the circuit board is oriented properly upon connection to the end cap. The end cap also has wire fixtures which hold winding leads of a winding and permit insulation displacement terminals on the circuit board to plug into the winding leads and achieve electrical contact at the same time the circuit board is mounted on the end cap. Hall devices mounted onto the circuit board are guided into pockets formed on teeth of the stator end cap for precise location. The end cap is constructed to shield the winding from contact with the motor shell. In addition, backward curved fans are employed to reduce mechanical noise in the direction of high speed rotation.

Abstract: A motor stator 400 is integrated with a position sensor 200 through a novel attachment ring 600. Electrical connection to the integrated device is through terminals 202, 210 that pass through the position sensor housing 250. The stator 400 is preferably overmolded, though other suitable forms of encapsulation are contemplated. The attachment ring 600 is preferably ultrasonically bonded to the sensor 200 during manufacture, prior to insertion of the motor armature 430. Other methods of attachment arc contemplated, and various types of motors and sensors are also contemplated.

Abstract: A ring-shaped bearing failure sensor constructed of insulation and electrically conductive material utilizing printed circuit board technology. Because of its construction, high dimensional tolerances can be achieved and the ring can be easily assembled as a component of a generator. Further, the bearing sensor is equipped with a resistor so that the operational readiness of the sensor can be monitored.