Abstract: It has been confirmed that even though there is a difference in the dimension of a perpendicular reference surface of a permanent magnet, there is almost no change in surface magnetic flux density, and variations in the dimension of the perpendicular reference surface do not much affect the surface magnetic flux density. Therefore, even though variations occur in the dimension of the perpendicular reference surface, variations in the characteristics of an IPM motor are prevented.

Abstract: It can be considered that a cross-sectional shape of a permanent magnet having a parallel reference surface is obtained by removing a portion from a cross-sectional shape of a permanent magnet which does not have the parallel reference. A cross-sectional area of the permanent magnet is further reduced than that of the permanent magnet which does not have the parallel reference surface. In addition, also a magnet volume of the permanent magnet is further reduced than that of the permanent magnet that does not have the parallel reference surface. The inventors have confirmed that a decrease in magnet volume induced by the parallel reference surface does not affect the characteristics of an IPM motor.

Abstract: A sintered magnet has an arc shape cross-section defined by an outer arc, an inner arc, and a pair of end sides connecting an end point of the outer arc and an end point of the inner arc, and a range of an central angle ? of the inner arc is 145°???180°. The inventors have newly found that a large magnetic flux can be obtained according to the sintered magnet and the characteristics of the motor can be improved, using such a sintered magnet.

Abstract: A sensor system determines an absolute angular position of a to-be-sensed rotating member. The sensor system may include a rotor with a first magnet coupled to the rotor and a shaft having threads thereon. The sensor system may further include a sleeve with a second magnet and threads complementary to the threads of a shaft. The sleeve may be configured to travel axially along the shaft as a function of rotation of the rotor. The sensor system may also include a first transducer configured to sense orientation of the first magnet and at least one second transducer configured to sense a location of the second magnet along the shaft. Through use of the sensor system, an absolute number of turns and, consequently absolute angular position, of the rotating member can be determined.

Abstract: A magnetic motor includes a rotor and a stator, in which there are magnets and materials of high magnetic permeability. The stator magnets are arranged with surfaces facing the rotor magnets in a staggered arrangement. The motor may be used to boost torque, for example in bicycles.

Abstract: The disclosure relates to an electric machine with a permanent magnet rotor, where permanent magnets have been fitted on an outer surface of a cylindrical rotor, and relates to a permanent magnet. The permanent magnets forming the electric machine's rotor pole are shaped so that the electric machine's air gap is substantially constant in a middle of the pole, and the air gap increases in an essentially straightforward manner when moving towards the edge of the pole. The permanent magnet is of an even thickness in the middle, and becomes thinner towards the edges. This can result in a decrease in the torque ripple and cogging torque of an electric machine.

Abstract: An electric motor (1) has a stator (3), a rotor (2) and a number of permanent magnets (6). The use of permanent magnets (6) having a cuboidal shape, without impairing performance. The stator (3) has a number of permanent magnets (6) having a cuboidal shape, which are embedded in recesses (7) and whose axial length (8) is greater than the axial length (4) of the stator (3).

Abstract: A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ferromagnetic material grains, wherein an amount of iron atoms in the fluorine compound particles is 1 to 50 atomic %.

Abstract: An electric motor with a small diameter can be provided with a stator with a comparatively small radial thickness which has the material volume required to conduct the magnetic flux. To this end, an electric motor (1) with a stator (3), has a laminated core (8) and a number of permanent magnets (6) and a rotor (2), which co-operates with the stator (3) and can rotate about a rotational axis (5). The stator (3) has a number of flux propagation elements (31), which together with the laminated core (8) are designed to conduct the magnetic flux and whose axial length (32) is greater than the axial length (4) of the laminated core (8).