Abstract: An electrostatic actuator 100 includes: a stator 1 that includes a substrate 102 and a plurality of linear electrodes 1a to 1d separately provided on the substrate 102 and arranged in parallel; and a movable element 2 disposed on the linear electrodes 1a to 1d of the stator 1. Multiple projecting elements 104b are provided at regular intervals on a surface of the stator 1 so as to face the movable element 2, forming a mat surface. A smooth layer 105 is formed on a surface of the movable element 2 so as to face the mat surface.

Abstract: Provided is a technology for enhancing the reliability of a permanent magnet rotating machine against thermal degradation of a permanent magnet. Specifically, provided is a permanent magnet rotating machine comprising a housing which houses a rotation shaft, a rotor connected to the rotation shaft and configured to rotate together with the rotation shaft, a stator, and permanent magnets fastened to the rotor or the stator; an air intake port provided at one end of the housing and an air exhaust port provided at the other end of the housing, the air intake port and the air exhaust port being configured to allow cooling air to flow through the housing; and a blower for feeding the cooling air to the air intake port; wherein the permanent magnet rotating machine is configured to be driven by magnetic force of the permanent magnets, and among the permanent magnets, a permanent magnet in the air exhaust port side has a higher coercivity than a permanent magnet in the air intake port side.

Abstract: A stator includes a hollow cylindrical stator core having stator teeth and slots. The stator teeth each extend radially inward and are circumferentially spaced from one another. Each of the slots is formed between one circumferentially-facing pair of the stator teeth and opens at the radially inner periphery of the stator core. Each of the stator teeth has a distal end portion that includes a slit, a base part and an oblique part. The slit is formed in a distal end surface of the stator tooth and extends axially. The base part and the oblique part are formed respectively on opposite circumferential sides of the slit. The base part extends radially inward to have a distal end surface that makes up an inner-diameter surface of the stator core. The oblique part is bent toward an adjacent slot so as to extend obliquely with respect to the base part.

Abstract: A spindle motor having a turntable is disclosed, the spindle motor including a rotating rotation shaft, a turn table coupled to the rotation shaft to rotate along with the rotation shaft, and formed at a central upper surface with an accommodation groove, and a torque enhancement member coupled to the rotation shaft, and arranged inside the accommodation groove of the turn table to enhance a rotational torque of the turn table by depressing the turn table.

Abstract: The present invention provides a sintered magnet having superior residual magnetic flux density and coercive force. The sintered magnet of the present invention comprises a group of R-T-B based rare earth magnet crystal particles 2 having a core 4 and a shell 6 covering the core 4, the mass ratio of a heavy rare earth element in the shell 6 is higher than the mass ratio of a heavy rare earth element in the core 4, and the thickest part of the shell 6 in the crystal particles 2 faces a grain boundary triple junction 1. A lattice defect 3 is formed between the core 4 and the shell 6.

Abstract: An electric machine includes a first magnetic pole with an arrangement of interposed magnetically active layers and magnetically inactive layers, and a second magnetic pole movable relative to the first magnetic pole and spaced from the first magnetic pole by a gap. An electrical conductor operates as a coupling element between an electrical circuit and a magnetic circuit. At an operating time, a common useful magnetic flux for electromechanical energy conversion flows through the magnetic circuit composed of the first magnetic pole, the gap and the second magnetic pole. The magnetically inactive layers have a lower average density than the magnetically active layers. A ratio (k) of the total volume of the magnetically active layers to the combined total volume of the magnetically active and inactive layers fulfills the condition 0.5?k?0.8 A method for producing an electric machine are also disclosed.

Abstract: Cooling apparatuses and methods comprising cooling apparatuses, such as those configured to be coupled to and/or cool electric machines (e.g., motors, generators, and the like).

Abstract: Adverse effects of a large assembling step comparable to tolerance of stacking members among constituent parts are prevented. At least two components and, among a voltage regulator, a brush holder and a rectifier, that are fastened with each other are provided with both component-fixing portions and fastening-together portions and for fastening the components together with each other, and an assembling step absorbing portion is provided at least at the fastening-together portion that is not close to the component-fixing portions of the respective components.

Abstract: An electric machine, such as a generator, providing for the generation of electricity and includes a rotor generating a magnetic field and a stator having stator windings. The interaction of the magnetic field with the stator windings generates current in the windings. The generator may provide the generated current to a power output of the generator, where it may be further transmitted to an electrical load to power the load.

Abstract: The present invention provides such a vibration generator which can obtain desired power-generation efficiency even if the vibration frequency is low. A vibration generator is provided with a vibrator which includes a plurality of magnets whose same magnetic poles are arranged by being faced to one another and which vibrates by a predetermined resonant frequency; a coil spring which supports the vibrator falling toward the gravitational direction and concurrently which vibrates the vibrator by a predetermined resonant frequency; a tubular winding bobbin in the inside of which the vibrator and the coil spring vibrate; coils which are wound on the outer circumference of the winding bobbin and which are connected in series inside groups divided into two or more; and a plurality of rectification circuits, each of which rectifies the output voltages of the coils for every one of the groups.

Abstract: A MEMS or NEMS device with at least one component made of a non-naturally occurring isotope material. The refined isotopic material provides advantages to device operation such as reduced mechanical loss, increased breakdown voltage, improved tunability and other advantages.

Abstract: An electronically commutated electric motor has an internal stator (18) and an external rotor (24). They are separated by an air gap (23). A circuit board (68) equipped with openings (58?, 70?, 72?) is arranged on the internal stator (18). The internal stator (18) has a lamination stack (22) that is equipped with a winding arrangement (60; 86, 88) whose terminals are implemented at least in part as wire segments (86E, 88E, 90). The lamination stack (22) of the internal stator (18) is covered, at least locally, by an insulating layer (20) made of a thermally stable plastic. Implemented on said layer are supporting elements (58; 70, 72) that project from the internal stator (18) toward the circuit board (68) and serve to secure wire segments (86E, 88E, 90) of the winding arrangement (86, 88). These supporting elements (58, 70, 72), with the wire segments mounted thereon, are each arranged in an associated opening (58?, 70?, 72?) of the circuit board (68) and are there soldered thereto.

Abstract: An electrical machine including a stator and a rotor rotatable relative to the stator with an air gap therebetween. The stator includes a first plurality of sources of magnetic field, which is equally spaced in a circumferential configuration over the stator. The rotor includes a second plurality of sources of magnetic field, which is equally spaced in a circumferential configuration over the rotor. The magnetic sources of at least one plurality are electromagnets and electromagnet includes at least one magnet coil resting on a magnet conductor. The magnetic conductor includes at least one member made of magnetically isotropic and/or anisotropic materials.

Abstract: An electric machine including a stator that is provided with at least one exciter unit including a coil, at least two annular yokes and at least one row of intermediate pieces, and a rotor having a structure and at least one receiver unit including at least two series of at least two rows of magnets. Two sides of each yoke include the first teeth, fitting with the intermediate pieces on a face of the exciter unit and alternatingly forming the second north poles and the second south poles. Each series is positioned opposite one face, forming an air gap with the exciter unit, with the electric machine thus including at least two air gaps, with a flux thus circulating inside the electric machine, dividing and regrouping itself in the vicinity of the magnets and of the yokes.

Abstract: An electric motor with a casing in which a stator in coaxial arrangement with the motor shaft and a rotor are disposed, and a terminal box which is attached to a casing peripheral wall and in which electronic components are arranged. Between the terminal box and the casing a breakthrough is provided on the one hand and an auxiliary impeller firmly connected to the motor shaft is mounted inside the motor casing on the other hand such that an air stream can flow from the interior of the casing into the interior of the terminal box and/or vice versa when the electric motor is operating.

Abstract: Electric motor systems and methods may provide highly efficient operation. The electric motor systems and methods discussed herein provide an oil filled motor that is low speed and utilizes permanent magnets. The electric motor may utilize a large number of poles and fractional slot design. Further, in some embodiments, the electric motor systems and methods may be suitable for use downhole.

Abstract: A hybrid induction motor includes an inductive rotor and an independently rotating permanent magnet rotor. The inductive rotor is a squirrel cage type rotor for induction motor operation at startup. The permanent magnet rotor is axially displaced and variably coupled to the inductive rotor (or to a motor load) through a clutch and is allowed to rotate independently of the inductive rotor at startup. The independently rotating permanent magnet rotor quickly reaches synchronous RPM at startup. As the inductive rotor approaches or reaches synchronous RPM, the coupling between the inductive rotor and the permanent magnet rotor increases until the two rotors are coupled the synchronous RPM and the motor transitions to efficient synchronous operation.

Abstract: Disclosed is a motor including: a rotor housing; a stator assembly located inside the rotor housing; a first core located inside the stator assembly; a second core located at the center of the rotor housing; and a coil housing located inside the rotor housing and having a space portion formed at the inside thereof.

Abstract: Disclosed is a voice coil motor, the motor including a mover having a bobbin equipped with a lens and a coil block secured to an outer circumference of the bobbin; a stator having a magnet that is disposed in such a way as to face the coil block; elastic members coupled to a lower end of the bobbin and connected to both ends of the coil block; a base supporting the elastic members and the stator; and a cover can covering the mover, the stator and the base, with an opening being formed in the cover can to expose the lens therethrough, wherein each of the elastic members includes a terminal portion that extends between the cover can and a side surface of the base, the terminal portion including a short-circuit prevention portion so as to inhibit a short-circuit between the terminal portion and the cover can.

Abstract: A motor connecting member, which connects a motor winding and a terminal block, includes a terminal to be connected to the terminal block, a winding connecting portion to be connected to the motor winding, and an extended portion extending between the terminal and the winding connecting portion. The extended portion is made by plastically deforming a single wire having a circular cross section, and is bent in a predetermined shape fitted for connection between an end of the motor winding connected with the winding connecting portion and the terminal block.