Abstract: A motor 1 includes a stator having an annular shape; and a rotor including a rotor magnet surrounding the stator, wherein an outer diameter of the rotor is in a range from 80 mm to 100 mm, the stator includes a yoke having an annular shape, a plurality of magnetic pole portions, a plurality of coupling portions connecting the yoke and the plurality of magnetic pole portions to each other, and a plurality of coils each wound around each of the plurality of coupling portions, the rotor magnet is continuously formed of a resin in an annular shape, the number of magnet poles of the rotor magnet is 14×N (pieces) (where N is a positive integer), the number of the plurality of magnetic pole portions is 12×N (pieces), and each of the plurality of magnetic pole portions extends in a circumferential direction.

Abstract: A rotor assembly used in an electric motor, includes a rotor having an inner diameter, an outer diameter, and a plurality of rotor slots; a plurality of permanent magnets received within the rotor slots; and a rotor plate having an inner diameter, an outer diameter, and an outer lip extending away from a radial face of the rotor plate toward the rotor, wherein an adhesive bonds the rotor plate to a radial face of the rotor.

Abstract: A rotating electrical machine includes a magnetic field-producing unit equipped with a magnet unit including a plurality of magnetic poles, and an armature which includes a multi-phase armature winding. The armature winding has conductor portions which are arranged at a given interval away from each other in a circumferential direction. The armature is designed to have conductor-to-conductor members arranged between the conductor portions in the circumferential direction. The armature may alternatively be designed not to have the conductor-to-conductor members disposed between the conductor portions in the circumferential direction. The magnet unit is magnetically oriented to have an easy axis of magnetization which is directed in a region close to a d-axis that is a center of a magnetic pole to be more parallel to the d-axis than that in a region close to a q-axis that is a boundary between magnetic poles.

Abstract: A centrifugal pump to improve the efficiency of fluid flow, and minimize long term wear on the pump by progressively increasing fluid pressure as fluid moves from an eye of an impeller towards diffuser blades, into the volute and out through an outlet. The fluid pressure is increased by progressively increasing the volume through which the fluid travels. A tear-drop shaped volute casing surrounding the diffuser and impeller creates a pocket of maximum pressure just below the outlet. A dampener can be provided to dampen the vibration of the motor. A cylindrical basket strainer can be provided with a flat face abutting against the volute casing to distribute pressure evenly. A clamp ring can be provided to easily seal and access the basket strainer using a plain rod.

Abstract: Provided is an electric motor which is simple to design and manufacture, and can be operated by a small current. The electric motor is comprised of a stator 55 having a first disk 45 and a second disk 50, a first ring core 10 having a first switching winding 15 divided into a winding part and a gap part, a second ring core 12 having a second switching winding 20 divided into a winding part and a gap part, and a first rotor 35 having a third disk 25 and a second rotor 40 having a fourth disk 30 mutually connected by a driving shaft 60. The first and second switching windings 15, 20 include first and second power supplies 125-1, -2, and first and second switches 75-1, -2, respectively.

Abstract: A small DC motor includes a motor frame having a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that comprises four sides and connecting portions, each of the connecting portions connecting adjacent two of the four sides and being located inward from a corresponding corner in a quadrangle comprising the four sides; and a magnet having a circumferential surface on an inside thereof and having conformable contact with the motor frame on an outside thereof.

Abstract: A motor comprises a stator and a rotor (20) disposed within the stator. The stator comprises a shell comprising a plurality of sidewalls (10a-10d) and arcuate connection parts (11a-11d) connecting neighboring sidewalls. The cross section of the shell is a polygon with fillets. The stator also comprises a plurality of magnets (12a-12d) installed inside the arcuate connection parts. The magnets (12a-12d) are mutual arranged at intervals. The outer surface of each magnet (12a-12d) is attached to inner surfaces of the two neighboring sidewalls (10a-10b) and a gap is formed between the magnet and the inner surface of the corresponding arcuate connection part. Air gaps are formed between the inner surface of the magnets (12a-12d) and the outer surface of the rotor. Disposing the magnets inside the arcuate connection parts improves the space utilization ratio.

Abstract: An electric motor has a rotor (20), a housing (10) and a ring magnet (12) fixed onto an inner surface of the housing. The housing (10) has a cross section in a polygon, preferably tetragonal, shape that comprises a plurality of side portions (10a˜10d) and a plurality of curved corner portions (11a˜11d), each of which connects two adjacent side portions. The thickness of the ring magnet at portions corresponding to the corner portions of the housing is larger than the thickness of the ring magnet at portions corresponding to the side portions of the housing. An air gap (123) is formed between a peripheral surface of the rotor and an inner surface of the ring magnet, the thickness of the air gap at portions corresponding to the corner portions of the housing being smaller than that of the air gap at portions corresponding to the side portions of the housing. The motor has a polygon housing which is convenient to install and has good space utilization.

Abstract: A small DC motor includes a motor frame having a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that comprises four sides and connecting portions, each of the connecting portions connecting adjacent two of the four sides and being located inward from a corresponding corner in a quadrangle comprising the four sides; and a magnet having a circumferential surface on an inside thereof and having conformable contact with the motor frame on an outside thereof.

Abstract: A flux-focused, shaped permanent magnet includes a body of magnetic material having multiple surface contouring to form a reduced flux side with convex surfaces and an increased flux side with concave surfaces. The surfaces develop high and low resistance external flux paths creating focused asymmetric flux fields. A magnetic unit having the shaped permanent magnet and a magnetic flux attracter or two shaped permanent magnets interconnected by two segmented permanent magnets and a kinetic device having a stationary stator ring, a rotor disc rotating within the stator ring and a multiplicity of the magnetic units on the stator ring and the rotor disc, are also provided.

Abstract: Improvement of torque densities, miniaturization and weight saving for outer rotor type motors or permanent-magnet-field-type DC motors can be efficiently achieved by high-energy densification of a magnet. However, torque pulsation or armature reaction gives negative influences thereto. Further, in application of a slotless (coreless) structure eliminating the torque pulsation or the armature reaction, the magnetic resistance of motor magnetic circuits will be enhanced. For solving the above problems, there is provided an annular magnet that is opened in a reverse direction relative to the opening direction of a U-shaped segment fabricated in constantly-directed magnetic fields, the annular magnet having an anisotropic distribution where angles relative to inner peripheral tangent lines can be continuously changed in the range of approximately 0 to 90 degrees, and having energy density (BH)max of 160 to 186 kJ/m3.

Abstract: A motor comprises a stator and a rotor (20) disposed within the stator. The stator comprises: a housing (31) having a polygon cross section that comprises a plurality of side portions (32a-32d) and a plurality of curved corner portions (33a-33d), each of the corner portions connect two adjacent side portions and curve around a center (O?) which is offset from the rotational center (O) of the rotor; and a ring magnet (34) fixed to the inner surface of the housing. An air gap (37) is formed between a peripheral surface of the rotor (35) and an inner surface of the ring magnet (34). The thickness of the ring magnet at portions corresponding to the corner portions (33a-33d) of the housing being larger than the thickness of the ring magnet at portions corresponding to the side portions (32a-32d) of the housing.

Abstract: An electric motor has a rotor (20), a housing (10) and a ring magnet (12) fixed onto an inner surface of the housing. The housing (10) has a cross section in a polygon, preferably tetragonal, shape that comprises a plurality of side portions (10a˜10d) and a plurality of curved corner portions (11a˜11d), each of which connects two adjacent side portions. The thickness of the ring magnet at portions corresponding to the corner portions of the housing is larger than the thickness of the ring magnet at portions corresponding to the side portions of the housing. An air gap (123) is formed between a peripheral surface of the rotor and an inner surface of the ring magnet, the thickness of the air gap at portions corresponding to the corner portions of the housing being smaller than that of the air gap at portions corresponding to the side portions of the housing. The motor has a polygon housing which is convenient to install and has good space utilization.

Abstract: A stator, in which a rotor is rotatably accommodated, is provided with a cylindrical yoke and a magnet that is arranged so as to extend along an inner circumference of the yoke, and has a plurality of magnetic poles generating a magnetic field operable to rotate the rotor. A tip tool is coupled to the rotor and operable to perform a prescribed working in accordance with the rotation of the rotor. The yoke is includes a plurality of steel plates laminated together to form a cylindrical yoke. At least one of a groove and a rib is provided on at least one of the inner circumference of the yoke and an outer circumferential of the magnet so as to extend in an axial direction of the cylindrical yoke. The at least one of the groove and the rib is provided at a boundary between the magnetic poles.

Abstract: A small DC motor includes a motor frame having a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that comprises four sides and connecting portions, each of the connecting portions connecting adjacent two of the four sides and being located inward from a corresponding corner in a quadrangle comprising the four sides; and a magnet having a circumferential surface on an inside thereof and having conformable contact with the motor frame on an outside thereof.

Abstract: An electromagnetic circuit that may be advantageously employed in an articulated camera, such as a CCTV camera, as a part of a servo mechanism to directly drive the camera and optical lens assembly, for example, in the pan and/or tilt axes. In one embodiment, the coil assembly of the servo mechanism may comprise four separate coils that rotate about the center of the ring shape of a single one-piece ring-shaped permanent magnet that has been pre-magnetized in two pair of opposing polarities. The magnet assembly that includes the magnet ring, may be bonded to a circular plate made of ferrous metal.

Abstract: The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum energy product approximately 4 times greater than the conventional sintered ferrite magnets. The use of a 4-pole configuration shortens the magnetic path length of the individual magnetic circuits and the magnetic force contributing to the torque is increased. When the torque is kept the same as in the conventional motor, the length of the electromagnetic rotor core and the axial magnet length can be reduced. In this fashion, 1-300 W class motors can be reduced in size.

Abstract: The present invention provides a structure for magnetizing a rotor magnet of a motor, which includes a rotor having a magnet cylinder with a wavy curve surface and a stator having a plurality of silicon steel sheets wound by a plurality of winding coils. The present invention also provides a structure for magnetizing a stator magnet of a motor, which includes a stator having a magnet cylinder with a wavy curve surface and a rotor having a plurality of silicon steel sheets wound by a plurality of winding coils.

Abstract: A brush motor has a magnetic sensor provided for detecting a change in a field magnet occurring in correspondence with a change in a rotational position of a rotor core.

Abstract: An electric machine including a direct current or an alternating current electric motor or generator and having a stator. The stator has an outer circumferential ring of equally spaced magnets. Spaced inwardly radially from the magnets is an inner circumferential ring of equally spaced magnets of opposite polarity to the first ring of magnets. A rotor including a plurality of H shaped energized electromagnetic coils is positioned in the space between the two rings of stator magnets with the rotor connected to a shaft whereby the pole pieces of the H shaped electromagnetic coils are influenced by the magnetic field of the two rings of stator magnets. The direct current machine being arranged to change the direction of electric current flow to the coils of the electromagnets.