Abstract: A linear motor includes a stator having field poles arranged linearly with opposing polarities arranged in an alternating manner; and a rotor having an armature core with teeth that faces a pole face of the field poles with a gap, and coils wound around the teeth. The stator and the rotor are supported in a slidable manner, a direction perpendicular to a sliding direction of the rotor and in parallel with the pole face is defined as a stacking direction. A head of each of the teeth has an extended portion extended in the sliding direction. At least heads of the teeth arranged at both ends of the armature core along the sliding direction is divided into a plurality of areas along the stacking direction. At least one of extended portions arranged on adjacent areas is extended by a different length along the sliding direction.

Abstract: An electric motor with a stator and a rotor, the stator and/or the rotor comprising a soft magnetic core comprising a lamination stack, is characterised, in that the lamination stack has a composition of 35% by weight?Ni?50% by weight, 0% by weight?Co?2% by weight, 0% by weight?Mn?1.0% by weight, 0% by weight?Si?0.5% by weight and 0.5% by weight?Cr?8% by weight and/or 0.5% by weight?Mo?8% by weight, residual iron and unavoidable impurities, where 0.5% by weight?(Mo+Cr)?8% by weight.

Abstract: A motor for optical systems, for example endoscopes, has a stator with two permanent magnets having poles which are disposed in the same direction and are magnetically interconnected by a flux return element. A coil is disposed between the magnets. Laterally of each magnet, a pole shoe is also magnetically coupled with the flux return element. A slider of the motor includes a yoke of a soft magnetic material, which yoke is in magnetic engagement with the permanent magnets of the stator. When the coil is excited with a current, the slider can be displaced from its rest position along a longitudinal direction.

Abstract: A magnet unit includes a first magnetic pole (7a), a second magnetic pole (7b) and a third magnetic pole (7c) at a center between the first magnetic pole (7a) and the second magnetic pole (7b), providing an E-shaped configuration. In the magnet unit, a first magnet is defined between the first magnetic pole (7a) and the third magnetic pole (7c) by connecting two electromagnets (71aa, 73aa) with each other through a permanent magnet (72a), while a second magnet is defined between the second magnetic pole (7b) and the third magnetic pole (7c) by connecting two electromagnets (71ba, 73ba) with each other through a permanent magnet (72b). With this configuration, it is possible to reduce a deviation in the length of respective magnetic paths from the permanent magnets (72a, 72b) up to their respective magnetic poles. By controlling exciting currents to the respective electromagnets (71aa, 73aa, 71ba, 73ba), it is also possible to adjust fluxes (or flux density) in respective directions x, y individually.

Abstract: A permanent magnetic actuator includes a flux inducing unit having a hollow space therein and formed by laminating a plurality of plates, a movable element disposed in the hollow space of the flux inducing unit to be reciprocated, permanent magnets installed at inner walls of the hollow space, and guide members located between the permanent magnets and the movable element and configured to guide reciprocating motion of the movable element.

Abstract: An electromagnetic machine (1) comprises an electrical conductor vane (7) disposed between two magnetic arrays (3). The electrical conductor vane (7) comprises a plurality of electrically insulated conductors (35), wherein when the conductors (35) are disposed in magnetic fields produced by the magnetic arrays (3) and when current flows in the conductors (35), an electromagnetic force is induced to cause movement of the magnetic arrays (3) relative to the electrical conductor vane (7) and wherein the set of conductors (35) substantially fills the gap between the magnetic arrays (3) through which the magnetic fields pass.

Abstract: A coreless linear motor includes a fixed member and a movable member. The fixed member has groups of permanent magnets arranged in a yoke. The movable member has a coil assembly. The groups of permanent magnets include first and second groups of permanent magnets arranged so as to face each other. Each of the first and second groups of permanent magnets has a plurality of magnets along a longitudinal direction of the yoke. In the plurality of magnets, magnetic poles of magnets facing along the longitudinal direction of the yoke alternate. Magnetic poles of the permanent magnets along the longitudinal direction of the yoke are the same. The coil assembly has at least three coils arranged movably relative to the first and second groups of permanent magnets along the longitudinal directions of the yoke between the first and second groups of permanent magnets.

Abstract: A linear motor is provided with a stator, a slider disposed to be movable relatively with respect to the stator with a gap, and a non-magnetic plate mounted to either one of the stator and the slider so as to define the gap between the stator and the slider.

Abstract: A mover includes a permanent magnet array having a plurality of permanent magnets that are magnetized in a direction perpendicular to a motion direction of the mover such that magnetic poles having different polarities alternately appear on magnetic pole surfaces of the plurality of permanent magnets in the motion direction. A stator includes first and second magnetic pole portion arrays and three excitation windings. Each of the magnetic pole portion arrays include a plurality of plate-like magnetic pole portions disposed on both sides of the permanent magnet array in the perpendicular direction. Each of the excitation windings is hollow-structured whereby two magnetic pole portions included in the first magnetic pole portion array and two magnetic pole portions included in the second magnetic pole portion array are located in an internal space of the coil and are excited by the corresponding one of the excitation windings.

Abstract: First and second projections are formed to protrude toward a guide rail from both sides of a slide table. Third and fourth projections are formed to protrude toward the slide table from both sides of the guide rail. A plurality of balls are arranged in clearances between the first and second projections and the third and fourth projections.

Abstract: A linear motor includes a slider unit having a magnet row in which plural permanent magnets are arranged in series so that the same poles are opposed to each other and moving in an arrangement direction of the magnet row by electromagnetic force, a stator unit in which the slider unit is inserted at an inner circumference side and electromagnetic coils for plural phases that receive supply of drive currents at different phases with respect to each phase are arranged along a movement direction of the slider unit, and a back yoke provided at an outer circumference side of the electromagnetic coils for plural phases in the stator unit, wherein plural slits along the movement direction of the slider unit for dividing a generation region of eddy currents into plural parts are formed in the back yoke.

Abstract: A coreless linear motor having a high rigidity, a high heat radiation effect, and a light weight is provided. The coreless linear motor includes a fixed member and a movable member moving relative with respect to the fixed member. The fixed member has a yoke and groups of permanent magnets arranged in the yoke. The movable member has a coil assembly. The groups of permanent magnets include first and second groups of permanent magnets arranged so as to face each other. Each of the first and second groups of permanent magnets has a plurality of magnets along a longitudinal direction of the yoke. In the plurality of magnets, magnetic poles of magnets facing along the longitudinal direction of the yoke alternate. Magnetic poles of the permanent magnets along the longitudinal direction of the yoke are the same.

Abstract: This disclosure discloses a rotating electrical machine comprising: a stator; and a rotor; one of said stator and said rotor having a coil, the other having a plurality of magnetic pole units each forming first and second magnetic poles configured to be aligned alternately and to have mutually opposite polarities at a side of the one of said stator and said rotor, each of said magnetic pole units comprising: a unit core that a projecting part configured to protrude toward the side of the one of said stator and said rotor is formed; and a permanent magnetic provided between each of said projecting parts on the side of the one of said stator and said rotor from said unit core, said first magnetic pole being formed by said permanent magnet, and said second magnetic pole being formed by each of said projecting parts.

Abstract: The invention relates to a short stroke linear motor. In order to improve the dynamics of such a short stroke linear motor, the primary part (12) of the motor is provided with a single-strand winding. The primary part (12) and the secondary part (1) have essentially the same pole pitch (tZ=tM). In this way, a very high motor torque is produced in a limited range of displacement. In order to be able to reach a plurality of working positions without an inactive intermediate position, a short stroke linear motor having a double-strand winding is additionally provided, both strands being operated at a phase difference of <90°. The pole pitch of the primary part and the secondary part are again essentially the same.

Abstract: Disclosed is a micro actuator capable of being formed in compact as a whole, such as 10 mm in diameter by diminishing a difference between a stroke distance of a moving member and an overall length, and by reducing a sectional area taken in a direction orthogonal to a stroke direction. The micro actuator includes: a spline shaft formed as a cylinder with a hollow part and having an axially extending slit opening; a spline nut fit-engaged with the spline shaft and axially guiding the spline shaft; a pair of end caps fixed to openings at both ends of the spline shaft; a magnet rod supported at both ends within the hollow part of the spline shaft by the end caps; and a forcer loosely fit-engaged with a periphery of the magnet rod within the hollow part of the spline shaft to constitute a linear motor together with the magnet rod and connected with the spline nut through the slit opening.

Abstract: A cylindrical linear motor capable of solving the problem that a leak flux links an aluminum frame at both ends of an armature of a conventional cylindrical linear motor, which causes a viscous braking force as a motor brake force, is provided. The cylindrical linear motor armature 20 includes a plurality of cylindrical coils 20a arranged in the axial direction in a cylindrical yoke 20b formed by a magnetic material and frames 20d and 20e covering the outside of the cylindrical yoke 20b. Only in the axial direction region of the frame 20d where the cylindrical yoke 20b exists, the frame 20d is formed by an aluminum frame 20d, and the axial direction both end portions are formed by a resin cap 20e.

Abstract: The brushless electric machine includes a first drive member (30U) having a plurality of permanent magnets (32U); a second drive member (10) having a plurality of electromagnetic coils and capable of movement relative to the first drive member (30U); and a third drive member (30L) disposed at the opposite side from the first drive member (30U) with the second drive member (10) therebetween. The second drive member (10) has magnetic sensors (40A, 40B) for detecting the relative position of the first and second drive members. The third drive member (30L) has at locations facing the permanent magnets of the first drive member (30U) a plurality of magnetic field strengthening members (32L) for strengthening the magnetic field at the location of the second drive member (10) in conjunction with the permanent magnets.

Abstract: An apparatus comprises a linear electromagnetic actuator which has a series of ferromagnetic poles, coils, and a series of permanent magnets to interact with the poles to induce movement of the actuator along a path. The poles have non-uniform configurations.

Abstract: A tool-changing device includes a tool gripper and a stroke and pivoting actuator for operating the tool gripper. The stroke and pivoting actuator can be driven by a first direct drive for producing a linear movement and by a second direct drive for producing a rotational movement, wherein the first and the second direct drives have a common rotor which serves as the stroke and pivoting actuator.

Abstract: A linear drive including a stator and a rotor configured for linear reciprocal movement along an axis, with the stator having a magnetic-field guide core having a plurality of legs extending each with one foot substantially toward the rotor, with the rotor having a plurality of magnets disposed in a linear array along the direction of the axis, wherein at least one of a respective one of respective lengths of the magnets along the axis and the respective widths of the legs along the axis and the respective spacings of the legs along the axis are different such that force components of the magnets along the axis will substantially compensate each other when the linear drive is in a de-energized state.

Abstract: Systems and methods for a linear motor having an integrated position sensing of the anchor of the motor are disclosed. An integrated position sensing of the anchor is achieved by sensing the inductance of one or more coils driving the anchor. The anchor comprises at least one permanent magnet. The inductance is dependent on a current position of the anchor. The anchor is driven by PWM pulses. A control unit controls the duration of driving the anchor and the duration of sensing the inductance. In normal operation during about 80% of a motor control period the anchor is driven and during a remaining time the inductance is sensed. In a preferred embodiment of the invention the linear motors invented are used in a camera module driving a lens barrel and a shutter.

Abstract: A linear motor is equipped with a coil body (62), and a yoke (71) that supports a magnetism generating body (72) and that moves relative to the coil body (62). The yoke (71) has a first portion (73) that is formed from a magnetic material and disposed based on the saturation state of the magnetic field, which is generated by the magnetism generating body (72), in the yoke (71).

Abstract: A miniature magnetic-levitated lens driving device includes a lid, a casing, a lens module, a plate spring, and a magnetic-levitated module. The lid has a hollow structure and is coupled to the casing. The casing is formed therein with a receiving space. The lens module is provided in the receiving space. The plate spring is fixed between the lid and the casing and configured to resiliently confine the lens module to the receiving space. The magnetic-levitated module is provided in the receiving space and corresponds in position to the lens module. A magnetic repulsive force is produced by and between the magnetic-levitated module and the lens module, and in consequence the lens module is magnetically suspended in the receiving space formed by the lid and the casing, so as to save power, and minimize friction and microparticles.

Abstract: A positioning apparatus includes a moving member, an actuator, and a controller. The moving member can move in at least a first direction. The actuator is provided along the first direction. The controller controls a current applied to the actuator in order to support the weight of the moving member. The bending rigidity of the moving member in the first direction is greater than the bending rigidity of the moving member in a second direction perpendicular to the first direction.

Abstract: Electric machines which are excited with permanent magnets are to be improved in terms of their smoothness of operation and their loss properties. For this purpose, an electric machine is proposed comprising a first active part (40) on which one electric magnet (41, 42) and at least one permanent magnet (44) are mounted, and a second active part (43) which has a multiplicity of pole teeth (45, 46) and which interacts magnetically with the first active part (40). The pole teeth (45, 46) are spaced apart from one another in a non-uniform fashion in the direction (3) of the movement of the electric machine and/or have different average widths from one another, with the respective width of a tooth being measured in the direction (3) of movement and being averaged in terms of the extent of the tooth in the transverse direction with respect to the direction of travel. The geometry of the tooth causes the harmonics of the magnetic field to be influenced in a selective fashion.

Abstract: An exemplary description provided for patent searches includes a linear electrodynamic system involving conversions between electrical power and mechanical motion uses unique magnet assemblies that move and unique stator assemblies and stator members shaped and oriented with respect to the moving magnet assemblies.

Abstract: A linear actuator is provided with an armature and a stator. The armature has at least two stacks of permanently magnetic rods one over another, the stacks being arranged at a predetermined distance from each other. The stator is at least partly produced from a soft magnetic material, and comprises at least two pairs of teeth with teeth opposite each other, each pair of teeth receiving one of the two stacks between them while forming an air gap. The stator has at least two magnetically conducting inner areas which are located between the two stacks and arranged at a predetermined distance from each other in the direction of motion of the armature. The inner areas are each at least partially surrounded by a substantially hollow cylindrical coil arrangement, the central longitudinal axis of which is oriented substantially transversely to the direction of motion of the armature.

Abstract: A linear motor includes a stator having teeth symmetrically formed on upper and lower surfaces thereof at regular pitch; a movable member including upper cores disposed above the stator, lower cores disposed below the stator in symmetrical with the upper cores, and yoke parts connecting the upper and the lower cores around the stator, wherein the upper and lower cores have upper and lower coils wound therearound, respectively; at least one gap sensor to detect the gap between the stator and the upper or lower core and the inclination of the movable member; a controller performing the levitation control by adjusting the amplitudes of currents applied to the upper and lower coils, based on the gap variation, and driving the linear motion by changing the current phases; and a multichannel voltage-to-current power amplifier of which each channel is connected to each coil of the upper and lower cores.

Abstract: A magnet yoke of a linear motor includes a plurality of recesses set in equidistance in a side surface of the magnet yoke and defining a plurality of peaks and valleys arranged alternately and a plurality of permanent magnets aligned abreast in equidistance in an opposite side surface of the magnet yoke so that an interval is defined between two adjacent permanent magnets and has a center aligned with a center of a corresponding peak and valley. Two adjacent permanent magnets form a magnet unit for generating a magnetic flux distribution. An empty section formed in each of the valleys is twice as wide as an interval between two adjacent permanent magnets, and is located in a middle of the two permanent magnets so as to make a moderate magnetic flux distribution.

Abstract: A stator element is disclosed for an electrical driving of a slidable body, such as a sliding door. Such a sliding door and a method for displacing thereof are also disclosed. In at least one embodiment, he stator element includes an elongate holder; a number of carrier elements arranged adjacently of each other and connected to the holder, wherein the carrier element includes a number of plate-like strips; and at least one winding arranged round each carrier element, wherein during use the winding is connected to a voltage source for the purpose of generating an electromagnetic field which during use is operatively connected to at least one counter-element in the form of a magnet or magnetizable element provided on the slidable body.

Abstract: A speaker apparatus comprises: a drive cone transferring a drive power of a voice coil to the diaphragm; a diaphragm disposed in a driving direction; and a diaphragm disposed in a driving direction. The drive cone is fixed to a diaphragm support of a frame. An outer circumference of the diaphragm is fixed to the diaphragm support of the frame. An outer circumference of the diaphragm is fixed to the diaphragm support of the frame. The diaphragm, the drive cone and the frame surround a sealed space where the diaphragm and the drive cone are connected through a non-ring-shaped connection piece. A vibration system is supported through a voice coil bobbin by a spring property of air contained in the sealed space.

Abstract: Linear electric generators include stationary windings and armature magnets arranged to reciprocate axially relative to the windings, or stationary magnet structures and movable windings arranged to reciprocate relative to the stationary magnet structures. The armature magnets or stationary magnet structures are in the form of multiple pole magnets made up of a plurality of individual pole structures, each pole structure including a pair of magnets joined to each other with facing poles of like polarity. In addition, the windings may be in the form of a double winding structure including at least one first clockwise winding and at least one second counterclockwise winding arranged in a multi-layered stacked arrangement.

Abstract: The invention relates to a primary part (2) for an electrical machine (1), with the primary part (2) being formed at least from a laminated core (3) and having at least one element (11) for reduction of the force ripple adjacent to one or both of its respective end faces (S1, S2), with the element (11) being electrically conductive (?el>0) and having negligibly low magnetic permeability (?r?1).

Abstract: A linear motor assembly includes two stators extending in parallel and having salient poles arranged at a predetermined interval on opposing surfaces and a mover having three types of mover blocks. The mover blocks are made up of three-phase alternating current coils configuring magnetic poles of three phases and permanent magnets arranged in alternating polarities on two surfaces of the mover blocks opposing each of the two stators. The mover blocks are movable between the two stators along a direction in which the stators extend. A plurality of linear motors are arranged in parallel with respect to a travel direction of the movers, and the stators provided between adjacent movers are integrally formed such that they have said salient poles on the two surfaces opposing these movers.

Abstract: Disclosed herein is to a flux reversal motor. The flux reversal motor includes a mover, and a plurality of permanent magnets. The mover moves linearly relative to a stator. A plurality of permanent magnets, having identical polarities, is provided in the end of each mover tooth. The permanent magnets are arranged on the left and right sides of a protrusion of the end of the mover tooth. Thus low noise/low vibration, high speeds, high precision, and high thrust motion can be realized.

Abstract: A magnet unit includes a first magnetic pole (7a), a second magnetic pole (7b) and a third magnetic pole (7c) at a center between the first magnetic pole (7a) and the second magnetic pole (7b), providing an E-shaped configuration. In the magnet unit, a first magnet is defined between the first magnetic pole (7a) and the third magnetic pole (7c) by connecting two electromagnets (71aa, 73aa) with each other through a permanent magnet (72a), while a second magnet is defined between the second magnetic pole (7b) and the third magnetic pole (7c) by connecting two electromagnets (71ba, 73ba) with each other through a permanent magnet (72b). With this configuration, it is possible to reduce a deviation in the length of respective magnetic paths from the permanent magnets (72a, 72b) up to their respective magnetic poles. By controlling exciting currents to the respective magnetic poles.

Abstract: A primary part of a linear electrical machine includes a first member for production of a first magnetic field, a second member for production of a second magnetic field. The first member and the second member are arranged to realize a superimposition of the first magnetic field with the second magnetic field. Arranged on at least one end face of the primary part is a flux-guiding element to reduce a force ripple. The flux-guiding element is constructed in the form of an end tooth module having at least one permanent magnet.

Abstract: A linear guide with an integrated linear motor, the linear guide having a stationary support extending in a guide direction, a table movable in the guide direction and a linear motor. The linear motor includes 1) a movable element connected with the table, 2) a stationary element connected with the stationary support and contactless bearings between the stationary support and the table and 3) an electromagnetic positioner based on electromagnetic interaction for positioning the table transversely in relation to the guide direction. The linear guide includes an integrated position-measuring system having a scale and scanning heads which detect a position of the table in the guide direction and a deviation direction, which lies transversely in relation to the guide direction and parallel in relation to a plane of an air gap of the linear motor. The electromagnetic positioner acts in such a way so that the table is positioned in the deviation direction.

Abstract: The brushless electric machine includes a first drive member (30U) having a plurality of permanent magnets (32U); a second drive member (10) having a plurality of electromagnetic coils and capable of movement relative to the first drive member (30U); and a third drive member (30L) disposed at the opposite side from the first drive member (30U) with the second drive member (10) therebetween, and having a fixed relative positional relationship with respect to the first drive member (30U). The second drive member (10) has magnetic sensors (40A, 40B) for detecting relative position of the first and second drive members; and a control circuit for carrying out control of the brushless electric machine utilizing the output signals of the magnetic sensors.

Abstract: An electro-magnetic motor-generator system, including a wheel assembly having a wheel mounted onto a shaft. The shaft has a sleeve mounted thereon. A frame assembly is mounted onto the sleeve. The frame assembly comprises at least one hub having a sprocket. A gear assembly comprises a second sprocket mounted onto the shaft that engages the sprocket. A rotating ring assembly has first and second walls. The first wall comprises first gear teeth and the second wall comprises second gear teeth. The ring assembly further has consecutive magnetized/non-magnetized sections. The electro-magnetic means consist of at least one coil having first and second openings. Electro-magnetic means generate an electromotive force between said first and second openings, and said consecutive magnetized/non-magnetized sections. Switching said magnetic polarity forces said rotating ring assembly to rotate upon said sprocket thus rotating said wheel mounted onto said shaft.

Abstract: A linear actuator includes permanent magnet annuli arranged about an armature core for axial movement in a tubular stator upon energization of coils arranged in concentric association with the armature. The stator has portions extending radially inwards of the coils and towards one another beneath each coil, which define a spacing between the coil and the armature. The annuli have a substantially radially magnetized structure and the coils are configured for single phase power input. In one embodiment (FIG. 6), two pairs of spaced annuli are arranged on the core, wherein the axial length of the outermost annuli is half the axial length of the inner annuli.

Abstract: A tool moving device with a linear motor is provided with a movable body which is movable bodily with a tool on a support frame through a pair of fluid bearings. A plurality of magnet constructs are circumferentially arranged on the movable body to respectively face stationary coils secured to the support frame. Each of the magnet constructs comprises at least one pair of magnet members juxtaposed in the moving direction of the magnet yoke and arranged with their polarities of magnet pole being opposite to each other, wherein respective pairs of the magnet members attached to the circumferential surface form first and second rows spaced from each other in the moving direction of the magnet yoke. Each magnet member in each of the first and second rows is arranged to be opposite in polarity of magnet pole to each of the magnet members next thereto in the circumferential direction.

Abstract: A first member (40a) has a magnet assembly (20) that includes a plurality of permanent magnets (10) held with their homopoles contacting one another. A second member (50a) includes magnet coils (30), and is designed to be changeable in position relative to the first member. The magnet assembly (20) generates the strongest magnetic field in a magnetic field direction lying in the homopolar contact plane at which the homopoles contact one another, the magnetic field direction being oriented outward from the magnet assembly (20) along the magnetic field direction.

Abstract: An actuator in which, when a supporting shaft, where a mirror (control object) is provided, is tilted by receiving an electromagnetic force of a magnetic driving mechanism, small balls of a supporting mechanism move in an axial direction in a space provided between an outer base and an inner ring member. Therefore, the supporting shaft and the inner ring member holding the supporting shaft swing. At this time, since the inner ring member swings around a rotational fulcrum as center, the supporting shaft can swing around one rotational fulcrum as center at all times. A plurality of laid members serving as a rotation restricting member prevent rotation of the supporting shaft in a direction around the axis.

Abstract: The aim of the invention is to simplify and to secure the mounting and adjusting of sensors on built-in motors. As a result, a direct drive built-in motor is equipped with a first motor component (2) which comprises at least one motor mounting element (21) for securing the first motor component (2) to a first machine part (4), and a second motor component which cooperates with the first motor component (2) for carrying out an opposite-sided movement. Also, a sensor device (5, 6) can be secured to the first motor component (2). Said sensor device comprises at least one sensor mounting bore (61) which is arranged in a predetermined manner through the motor mounting part and can be connected to the first machine part Also, the position and/or orientation of the sensor device (5, 6) are predetermined in a mounted state on the first machine part (2).

Abstract: A periodic magnetic field generation device is provided with a field pole of a Halbach array structure in which main pole permanent magnets magnetized in a direction of a generated field and sub pole permanent magnets magnetized in a direction opposite to the direction of magnetic poles of the main pole permanent magnets are alternately disposed linearly or circularly so as to be adjacent to each other. A part of each of the main pole permanent magnets on a side on which the magnetic field is generated is replaced by a soft magnetic member, and a relation between a length A of the soft magnetic member on the side of the generated field along a moving direction and a length B of each main pole permanent magnet on a side of a back yoke along the moving direction is A<B.

Abstract: The aim of the invention is to provide a robust, simple woodworking machine. To achieve this, the invention provides a machine comprising at least one linear direct drive, which contains a primary part (3, 3a, 3b, 4, 4a, 4b) with a first element (9, 10, 12, 14) for generating a first magnetic field and at least one additional element (17, 18, 20, 27, 28, 29, 30) for generating an additional magnetic field. The first element (9) for generating the first magnetic field is positioned, in particular, in such a way in relation to the additional element (17, 18, 20, 27, 28, 29, 30) for generating the additional magnetic field that the first magnetic field overlaps the additional magnetic field. The machine also comprises a secondary part (5, 6, 6a, 6b), which comprises magnetic return elements and is devoid of magnetic sources.

Abstract: The invention relates to an electrical machine of the transversal-flux type. The machine comprises a stator and a movable element. The stator has a plurality of stator elements with magnetic flux conductors and an electric winding extending in a closed winding path through each magnetic flux conductor. The movable element comprises a number of permanent-magnet members and is movable in relation to the stator along a movement path. The winding path comprises a first current-carrying section extending along the movement path. Each magnetic flux conductor forms, together with one of the permanent-magnet members, a closed magnetic flux circuit around said current-carrying section. Each permanent-magnet member comprises a primary magnet with a magnetic direction across the movement path.

Abstract: A linear motor is provided including a magnet track including a plurality of permanent magnets, and a coil assembly including a plurality of laminations. The coil assembly defines a plurality of teeth having slots therebetween. The plurality of teeth include (1) two end teeth and (2) at least one non-end tooth arranged between the two end teeth. Each of the two end teeth defines an end profile including a first surface and a second surface. The first surface and the second surface are separated by a step which is substantially perpendicular to a plane defined by the plurality of magnets. The linear motor also includes a plurality of coils at least partially disposed in at least a portion of the slots defined by the plurality of teeth.

Abstract: A lens driving device, comprises a base; a casing fixed to the base; a coil bracket disposed within the casing; a coil wound on the coil bracket, a spring disposed within the casing, a drive rod; and a lens holder; wherein, one end of the spring is fixed to the base; one end of the drive rod is fixed to the other end of the spring, and the other end of the drive rod extends out of the casing. The lens holder is slidably fixed to the exposed portion of the drive rod. The lens holder is held stationary with respect to the drive rod by static friction between the drive rod and the lens holder. A driving signal may be applied to the coil to move the lens holder. The driving signal has the characteristic of making the current flowing through the coil slowly increase and then rapidly decrease, or to rapidly increase and then slowly decrease. The drive current is preferably a sawtooth pulse train, with each pulse causing movement of the lens holder in the micron range or below.