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Patent Searching and Data


Matches 1,151 - 1,200 out of 16,063

Document Document Title
WO/1995/022851A1
First, second and third zones (11a, 12a, ...) having different physical properties are disposed in this order on the outer periphery of a rotary disc (15) rotating synchronously with a motor. The lengths of the zones of these first to th...  
WO/1995/022192A1
A two-phase variable reluctance electric motor has four stator poles (81, 82), each pole having a magnetising winding. Pole (81) has a first phase winding and pole (82) has a second phase winding and the phases of the windings alternate ...  
WO/1995/022195A1
The invention relates to a D.C. motor (1) comprising a stator (60) with at least two stator coils (2, 3), a rotor (4) rotatably arranged relative to the stator, a position detector (5) for detecting predetermined rotor positions, an elec...  
WO/1995/012241A1
An electric motor is described, of the type that includes a rotor with permanent magnets and a stator with electromagnets, which operates at high efficiency to produce a high ratio of mechanical power output to electrical power input. Du...  
WO/1995/010134A1
An electric motor (10) including a stator and a rotor, the rotor includes a plurality of equispaced permanent magnets mounted on a non-magnetic disk, the stator includes a plurality of equispaced windings energised by a circuit means (12...  
WO/1995/003917A1
A grinding machine provided with a spindle (5) rotating under the influence of a cantilever mounted rare earth permanent magnet motor (40). Hydrostatic fluid film bearings (41, 42) are provided between the ends of the spindle (5) and a b...  
WO/1995/003646A1
A motor or alternator comprises a number of permanent magnets (34, 36) arranged about the periphery of a rotor (30). The magnets (34, 36) are encompassed by stator coils (44) pressed over and supported on the stator housing (41) between ...  
WO/1995/002915A1
An electromechanical machine (10) includes a field producing assembly (18) which is constructed so as to have an annular gap (20) circumferentially disposed about an axis of rotation and to produce a magnetic field across the gap (20) wh...  
WO/1995/002922A1
This reluctance motor rotates at a high speed with small vibrations, but develops a great output torque. The torque characteristic of the output torque is flat. The motor comprises a rotor having n (n is a natural number of 2 or more) sa...  
WO/1995/001884A1
The invention relates to a drive arrangement for a hybrid vehicle fitted with an internal combustion engine and an electric motor (4) which can be driven, as desired, at least for limited periods, purely by the internal combustion engine...  
WO/1994/029942A1
A flux path and core loss reduction assembly is provided. The assembly comprises a magnetizable peripheral rotor section (18) upon which armature windings (70e-84e) are disposed, isolated from the rest of the assembly by a non-magnetizab...  
WO/1994/028616A1
A method for smoothing the torque characteristics of a multi-phase PM synchronous machine by controlled driving with a conventional voltage source inverter operated in accordance with a predetermined switching sequence wherein the sum of...  
WO/1994/023911A1
A concentric-shaft rotational drive system for an articulated arm transfer device (3) adaptable for imparting movement to an assembly inside a vaccuum chamber (2) wherein rotary movement is imparted to rotors (7, 9) inside the vaccum cha...  
WO/1994/023490A1
A brushless repulsion motor (10) in which the rotor (17) carried electronic switch circuits (22) for selectively shorting the rotor windings (19) at appropriate times in its rotational cycle. A noncontact reference signal source (24) on ...  
WO/1994/023486A1
A permanent magnet generator (50) includes a rotor (56) having poles (P1-P12) wherein one of poles (P1) of the rotor is non-magnetic. A stator (54) has stator windings (106, 118, 130) wound in cooperation with the poles of the rotor. The...  
WO/1994/022206A1
This invention provides a brushless DC motor capable of ultra-high speed revolution by setting a gap length between a stator (1) and a portion of a rotor (2) having a metallic property to at least N5/6.p1/8.d.Kg.  
WO/1994/022204A1
This invention relates to high-density discoidal brushless induction open frame motors and generators with multistacking, multiphasing and multistaging capability. These motors may be in the range from 10 hp to 25,000 hp or more and thes...  
WO/1994/019914A1
Apparatus (21) is described for reproducing low frequency sound in response to an applied electrical signal having a rotary acoustic radiator (22) comprised of a chamber (26) having a rotor assembly (58) including a shaft (61) and movabl...  
WO/1994/019864A1
An economical reluctance drive/generator system including a double AC-fed reluctance motor (2) having two three-phase stator windings (p1 and p2) and a rotor (20) with simple salient poles. The speed of the motor (2) may be varied by alt...  
WO/1994/019855A1
A device for field weakening in a doubly-salient variable reluctance motor having permanent magnets (22, 24) in the stator (10). The field weakening increases the constant power range of the motor and is accomplished by controlled moveme...  
WO/1994/019859A1
A discoidal dynamo-electric machine has a discoidal stator (303) carrying a plurality of meandering copper windings (301, 302) embedded in a substrate having a magnetic permeability of less than 20, relative to air, and a discoidal rotor...  
WO/1994/017582A1
A motor system apparatus (100, 800) and method that converts pulsed electromagnetic energy into mechanical force and motion. Motor apparatus (100, 800) produces usable mechanical power by rotary action (A3) made possible by wheels (200, ...  
WO/1994/014226A1
A fault tolerant brushless DC motor includes plural parallel windings (17), each individually controlled by a respective control module (21). At least three windings are provided such that in the event there is a short in one of the wind...  
WO/1994/013051A1
Brushless dynamoelectric machines (30) utilizing conventional DC armature construction. The winding (17) of the armature (31) is modified by providing a set of three leads (37, 38, 39) to its coil ring circuit (36) at point spaced angula...  
WO/1994/013052A1
High power self-controlled multi-phase synchronous machine consisting of a movable magnetized rotor rotating in relation to a coaxial stator part (99) comprising electric coils for energizing stator magnetic circuits. The machine also co...  
WO/1994/011945A1
A method of estimating and controlling rotor position and velocity for a multi-phase brushless permanent-magnet motor (12) by measuring only the stator phase 5 currents (24) at a high sampling rate. Measurements of the stator phase curre...  
WO/1994/009549A1
The brushless DC motor (500) comprises at least one multi-pole composite magnet (4, 5, 30, 506, 1006) which functions as a rotor, at least one stator member (502, 1002) which determines the angular position of this rotor, means for posit...  
WO/1994/006198A1
A new class of higher phase-order (five or more) quasi square-wavbe back emf permanent magnet machines including radial, axial and linear embodiments which employ a greater number of active phase windings located in the slots between the...  
WO/1994/005074A1
In a brushless DC motor of a radial gap type, one of a pair of vertical (right and left) pole teeth (Xx, Yy) is formed in such a manner as to possess a smaller gap in a circumferential direction than the other, and the position of this p...  
WO/1994/005075A1
In a brushless motor which includes a stator (26) and a rotor (1) rotatably supported inside the stator and wherein the rotor has a yoke (2) formed by laminating a large number of steel sheets (4), the yoke has an even number of magnetic...  
WO/1994/003779A1
An apparatus for position detection using signal patterns created by use of a fixed disk having three conductive patterns disposed thereon. The first and second patterns are annular conductive paths which are coaxial with respect to one ...  
WO/1994/001920A1
A brushless motor which includes a stator (9) and a rotor (8) rotatably supported inside the stator. The rotor has a rotor yoke (10) formed by laminating a large number of steel plates, the rotor yoke has an even number of magnetic pole ...  
WO/1994/001917A1
An electric motor-wheel including a hollow shaft with a first opening at a first end thereof and a second opening at a second end thereof, wherein said first opening receives conductors from outside the motor-wheel; a stator coaxial with...  
WO/1994/001919A1
A fault-tolerant reluctance motor has a multiphase stator winding. The stator (2) has a different number of poles from the rotor (5). The lead angle and the pole angle beta, betar) embraced by each stator and rotor pole (3, 5) is at leas...  
WO/1994/000903A1
The present invention relates to an apparatus having spaced permanent magnets (24, 54, 56) positioned so there is a magnetic interaction between them, and controlling the interaction by having a coil (26, 28, 30, 32, 34, 36, 38) in the s...  
WO/1993/024983A1
The invention concerns an electric machine whose windings (85) are connected to controllable semiconductor valves (101), in particular of the power-transistor type, the windings (85) also being in heat-exchange contact with a fluid-coola...  
WO/1993/024955A1
The proposal is for a fluid-cooled power transistor arrangement, the semiconductor component (1) of which is arranged on an especially boardlike insulating substrate (9) via a metal electrode (7). The flat side of the semiconductor compo...  
WO/1993/023918A1
A variable reluctance drive system including a motor and corresponding converter for improved current commutation. The motor incorporates a salient pole rotor (16) and a salient pole stator (10) having one or more full pitch windings (20...  
WO/1993/023911A1
The aim of the present invention is to use only one sensor in a system of motor control using Hall sensors. According to the invention, various combinations of potential and/or phase shifts of the two sensor signals of a Hall sensor are ...  
WO/1993/023266A1
An electric car equipped with a battery power source, a motor and a controller and having a construction wherein a filler (15) seals a gap between a motor case (11) and a motor cover (12); a portion connecting the motor (6) with the case...  
WO/1993/022820A1
The present invention is related to a rotor position detecting apparatus for a brushless motor enclosed in a housing. The apparatus comprises a plurality of light reflecting members attached to the surface of a rotor of the motor in the ...  
WO/1993/019510A1
An electronically switched small-power motor operated with a d.c. voltage network has a plate-like stator (10) and a disk-like rotor (11) with axially magnetized magnetic poles. In order to reduce the speed of rotation in an optimal mann...  
WO/1993/017484A1
A pump specially designed for aggressive or environmentally hazardous materials contains a pump wheel, the shaft (8) that carries the pump wheel, and the rotor (12) of an electromotive drive (4) inside a hermetically sealed housing (10)....  
WO/1993/015513A1
A motion producing device using permanent magnets (22) as the source of energy including one or more permanent magnets (22) at least one having a coil (24) mounted on it, and an electric circuit for connecting the coil (24) to a source o...  
WO/1993/015550A1
A reluctance motor, which has a small diameter, a high rotating speed and a high efficiency, or which has a large output torque, little vibration and, if necessary, which can be regeneratively braked. The rotor of the reluctance motor is...  
WO/1993/015547A1
In a rotational/linear brushless DC motor/generator the rotor/slide (100) has many equally spaced permanent magnet poles (101) of alternating polarity and it has no or little magnetically permeable iron parts. These magnets (101) cover t...  
WO/1993/013585A1
A flat brushless motor for generating vibration used as a paging means of a portable communication device such as a radio pager. The flat brushless motor has a back yoke (5a) of which the center of gravity is deviated from the center of ...  
WO/1993/012573A1
The present invention relates to doubly salient reluctance machines (DSRMs) including switched reluctance machines, stepping motors and hybrid stepping motors. To improve the utilisation of the machine windings and associated electronic ...  
WO/1993/011597A1
A structure of the terminals of a brushless motor, which enables the motor to be thin and enables the windings of the motor to be connected to a circuit base board easily and automatically. The brushless motor comprises a rotor section, ...  
WO/1993/010593A1
A brushless DC motor, whose stator (10) is a combination of stator yokes (11, 16), a bobbin (14) on which a magnetic field coil (15) is wound and to which terminal pins are provided, and a base plate (20). The stator (10) is fixed to the...  

Matches 1,151 - 1,200 out of 16,063