62results about How to "High force density" patented technology

An improved linear hybrid brushless servo motor is disclosed. The motor comprises a forcer and a platen. The forcer has a plurality of stacks, permanent magnets, and coils which form a three-phase motor. The platen has a low cost ferromagnetic steel plate. The stacks, permanent magnets and phase coils of the forcer are specially designed to have the optimal electromagnetic coupling between the forcer and platen to achieve a high force density servomotor. In one embodiment, two E-shaped stacks are used to physically couple two phases to substantially minimize the unexpected cogging force and force ripple. Three other forcer configurations which achieve a three-phase, highly cost effective and high force density linear hybrid brushless servo motor are also disclosed.

A linear actuator in an electric percussion tool is equipped with a rotor and a stator, wherein the rotor has at least two stacks, which are arranged at a predetermined distance from one another, of superposed permanently magnetic bars, the stator is formed, at least partially, from a soft-magnetic material and has at least two pairs of teeth with mutually opposed teeth, of which each pair of teeth receives one of the two stacks between them, in each case, while forming an air gap, and wherein the stator has at least two magnetically conductive inner regions which are located between the two stacks, are arranged at a predetermined distance from one another in the direction of movement of the rotor and are at least partially surrounded, in each case, by an essentially hollow-cylindrical coil arrangement, the central longitudinal axis of which is oriented approximately transversely to the direction of movement of the rotor, and the rotor has a driving element which is able to transmit a mechanical impulse to a tool belonging to the electric percussion tool.

Motive power of a combined driving device or a linear motor should be improved, and accordingly a combined driving device for performing rotational motion and reciprocating linear motion is provided that possesses a rotary motor (1) and a linear motor (2) and an operating shaft (3). The operating shaft (3) can be rotated by the rotary motor (1) to perform rotational motion and can perform linear motion by the linear motor (2); the operating shaft (3) possesses an output side (4). The rotary motor (1) is more closely arranged on the output side (4) of the operating shaft (3) than the linear motor (2). Accordingly the operating shaft (3) can be designed to be shorter. The measure of improving motive power is to reduce rotor quality of the linear motor (2).

A plunger lift system that uses a linear induction motor instead of gas or fluid pressure to lift the plunger. Electrical voltage is applied to electromagnets installed along the tubing of a wellbore that will induce magnets contained within a special plunger that is introduced inside the tubing to move it and allow it to lift liquids with a piston-like action. The electromotive force may be adjusted by varying the applied voltage as needed to lift the column of liquid from the wellbore or the current reversed to accelerate and optimize plunger descent.

An integrated bearing system (10) for supporting a rotatable shaft journal (58). The system (10) comprises a foil bearing (40) in combination with a magnetic field generating device (50) that produces a magnetic bearing capability to the rotatable shaft journal (58). The foil bearing (40) is integrated into the magnetic field generating device (50), leaving an air gap between the shaft journal (58) and the foil bearing (10). Under normal operating conditions, the magnetic field generating device (50) and the foil bearing (10) each provide a portion of the support to the shaft journal (58).

The gas exchange valve drive for a valve-controlled combustion engine has a hollow cylindrical rotor to be coupled with a valve member and a stator, with the rotor comprising permanent-magnetic rings concentrically arranged one above the other, the stator being at least partially constructed of a soft magnetic material and comprising at least one tooth facing towards the rotor, the stator comprising a radially inner magnetically conductive area and a radially outer magnetically conductive area, with the rings of the rotor being arranged between the inner area and the outer area of the stator, and the outer area of the stator in at least one partial section being designed with a C-shaped cross-section and comprising at least one stator coil. In the radially inner magnetically conductive area of the stator and/or in the radially outer magnetically conductive area of the stator at least one tooth is formed in the direction of movement of the rotor, whose dimension in the direction of movement of the rotor is essentially the same as the dimension of a permanent-magnetic ring in the direction of movement of the rotor, so that in a predetermined position of the rotor the at least one tooth of the stator is in alignment with one permanent-magnetic ring.

The invention discloses a block-based switched reluctance motor with a short end part and a short magnetic circuit and a control circuit thereof. The motor comprises a motor stator and a block-based motor rotor; the stator comprises a stator core and a winding; a rotor part comprises rotor overlaid cores and a non magnetic framework; a plurality of stator teeth are uniformly distributed on the stator core; the stator winding is of a concentrated winding structure and wound on the stator teeth; the rotor overlaid cores are uniformly distributed at the inner side of the stator teeth and embedded in the non magnetic framework; a rotating shaft is arranged at the center of the non magnetic framework; during the running process of the motor, the motor at least has two electrified phases which are adjacent to each other; the route of the magnetic field inside the motor comprises the stator teeth of the two adjacent phases, as well as a stator yoke part, the rotor overlaid core and an air gap between the stator teeth of the two adjacent phases. When the motor disclosed by the invention runs, two adjacent phases are powered on and off at the same time, the width of the air gap magnetic field of the more is improved, the output torque of the motor is improved, and the force density of the motor is increased.

The invention provides a multiphase transverse magnetic field permanent magnet linear synchronous motor, which relates to a linear synchronous motor and aims to solve the problems that the prior transverse magnetic field motor has a complex structure and higher processing technological requirement. A stator component consists of n magnetic iron core rings, n-1 non-magnetic support rings and armature windings, wherein the n magnetic iron core rings and the n-1 non-magnetic support rings are arranged and overlaid alternately along the axial direction to prepare a stator core, the armature windings are encircled on I-shaped stator teeth of the magnetic iron core rings along the axial direction, the outer surface of a cylindrical mover iron core is provided with permanent magnet strips which have the same number with the pole number of motors and consist of permanent magnets along the axial direction, and the adjacent two-phase permanent magnet strips are arranged at a distance which is 2/m times of the staggered polar distance Tau, wherein m is the phase number of the motors, and the permanent magnet strips consist of a plurality of permanent magnets which have opposite magnetization directions and are arranged alternately along the axial direction. The multiphase transverse magnetic field permanent magnet linear synchronous motor not only has simple structure and processing technique, but also has the advantages of high force density and high control characteristic, and can be widely applied in the fields of national economy, national defence and the like.

A clutch couples a car door of an elevator car with a landing door of an elevator system, wherein the car door is movable with respect to the elevator car by a first actuator. The clutch includes at least one coupling element and a second actuator. The coupling element is movable with respect to the car door between a first position and a second position by the second actuator such that the coupling element engages with the landing door when the elevator car is within a landing zone and the coupling element is moved towards the second position, thereby establishing the coupling of the car door with the landing door. The second actuator is a linear motor.

The invention provides a permanent magnet levitation linear electromagnetic propelling system and relates to a motor, in particular to a magnetic levitation linear motor. The system aims at solving the problems that a magnetic field formed by superconducting magnets is serious in flux leakage, the magnetic field shielding difficulty is large, and the levitation control difficulty of the normal conducting magnetic levitation technology is large. The system comprises a drive control subsystem and a linear motor subsystem. The drive control subsystem comprises a power converter unit and a controller. The linear motor subsystem comprises a stator and a rotor, the stator is fixed to the ground, and the rotor is fixed to a prying vehicle and moves relative to the stator; the stator comprises a levitation-guide winding and a propelling winding; the levitation-guide winding a unilateral levitation-guide primary unit; and the propelling winding comprises a bilateral propelling primary unit. A special levitation and guide control device is not needed; and no leaking magnetic field exists on a vehicle.

A linear actuator is provided with a rotor and a stator. The rotor comprises 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 rotor. 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 rotor.

The invention discloses a rapid deflection mirror driven by a Maxwell force. The deflection mirror comprises a reflector, a Maxwell force actuator, a flexible support system, an angle detection systemand an outer frame assembly, wherein the reflector is installed in a center of a reflector support, the Maxwell force actuator includes a ring armature and four electromagnetic units, the ring armature is fixedly connected with the reflector support, each electromagnetic unit is composed of a permanent magnet, a coil winding and a stator core, and the four electromagnetic units form four permanent magnet magnetic circuits and eight alternating current magnetic circuits; the flexible support system mainly includes a flexible diaphragm and an axial flexible piece, recovery torque is provided for an actuating torque to achieve angle control, the flexible diaphragm supports the ring armature on four side surfaces, and the axial flexible piece supports the ring armature in the center of a lower end; and four non-contact capacitance displacement sensors in the angle detection system are uniformly distributed in four directions to detect a steering angle of the reflector in real time and generate angle feedback control and angle closed-loop control. The deflection mirror is high in force density, compact in structure and convenient to machine and manufacture.

The invention relates to a cylinder linear motor. The cylinder linear motor comprises a primary structure, a secondary structure, multiple sets of thirteenth salient pole structures, multiple third permanent magnets, multiple fourth permanent magnets, multiple first windings and multiple second windings, wherein the primary structure and the secondary structure are cylindrical structures, the primary structure is sleeved outside the secondary structure, the primary structure and the secondary structure are coaxially arranged, the multiple fourth permanent magnets are mounted on an outer wall of the secondary structure, one ends of the thirteenth salient pole structures are mounted on an inner wall of the primary structure, and the multiple third permanent magnets, the multiple first windings and the multiple second windings are mounted on the multiple sets of thirteenth salient pole structures. The windings are arranged on the static side of the primary structure, so the structure of the secondary structure is made to be simple, cost is reduced, moreover, the secondary structure is disposed in the sea water, corrosion to the magnet windings is avoided, maintenance is convenient, reliability is high, the permanent magnets used for having the auxiliary effect are all arranged on the secondary structure, and the magnetic field of the linear motor is further improved.

A magneto-optical trap apparatus includes a vacuum vessel for encapsulating an atom to be trapped, an anti-Helmholtz coil for applying a magnetic field to an inside of the vacuum vessel, a laser device for generating a laser beam, and an irradiation device for irradiating the generated laser beam from a plurality of directions. The laser beam includes a first laser beam detuned from a first resonance frequency when the atom transits from a total angular momentum quantum number F in a ground state to a total angular momentum quantum number F′=F+1 in an excited state, and a second laser beam detuned from a second resonance frequency when the atom transits from the total angular momentum quantum number F in the ground state to a total angular momentum quantum number F′=F−1 in the excited state, among transitions from J=0 in a ground state to J′=1 in an excited state.

Disclosed is a double-stator linear vernier permanent magnet (DS-LVPM) motor and method to increase the magnetic field modulation effect. The motor contains a primary, and first and second secondaries on both sides of the primary, spaced by an air gap. The motor secondary includes modulation teeth. The primary is bilaterally symmetrical, and permanent magnets (PM) are embedded in the yoke of the primary core elements. The design solves the inherent problem of flux leakage at the end of PMs for conventional VPM motors, so as to improve utilization of PMs, thereby increasing thrust density of the motors. Additionally, the motor secondaries are laminated by silicon steel sheet, which saves PM material and significantly reduces cost for linear long stroke applications. By adjusting PM structure parameters, the design can use finite element method (FFM) to calculate repeatedly to get PM structure parameters corresponding to maximum electromotive force (EMF).

An electrical machine has a variable reluctance rotor, and a stator formed as an annular array of stator segments. The reluctance of the rotor-to-stator magnetic flux path varies with rotor position whereby the stator segments are magnetically energizable to rotate the rotor. The stator segments are arranged in the array such that, when energized to rotate the rotor, they produce an unbalanced force on the rotor. The machine further has a compensator including one or more balancing segments which are configured to be magnetically energizable to produce a balancing force on the rotor which balances the unbalanced force. The reluctance of the rotor-to-compensator magnetic flux path is substantially invariant with rotor position.