Abstract: The integrated magnet body according to the invention is an integrated magnet body formed by laminating and securing a plurality of pieces of magnet through an insulating film between pieces of magnet, characterized in that the insulating film has a film thickness of 0.01 &mgr;m or more, and a ratio of a total sum of the thickness of the insulating films to an overall length in the laminating direction of the integrated magnet body is in a range of from 0.0005 to 3%. The integrated magnet body according to the invention is excellent in insulating property and effective volume ratio and thus can attain high efficiency of a motor by installing the integrated magnet body in the motor.

Abstract: A rotor structure for a motor having built-in type permanent magnets includes a multiplicity of axial slots for containing the permanent magnet, and a shaft hole for installing a shaft. The invention essentially forms a petal-shaped convex polar portion having an exterior circular arc on the outer side of the rotor adjacent each axial magnet slot, where the radius of the circular arc is smaller than the radius of the rotor. The petal-shaped convex polar portions provide an approximately sinusoidal distribution of air-gap magnetic flux that can improve the cogging torque of the motor, weaken the armature reaction of the motor, and prevent the permanent magnets from being demagnetized. In addition, an axial empty slot is also provided between the shaft hole and the corners where the adjacent magnet slots approach such that the magnetic flux leakage can be prevented and the weight of the rotor can be reduced too.

Abstract: A generator-motor for a vehicle includes a rotor having a rotor core and a plurality of permanent magnets and a stator having a stator core and an armature winding. The rotor core has a plurality of axially extending through-holes in a circumferential direction thereof to accommodate the permanent magnets and to increase circumferential magnetic reluctance thereof to form a plurality of auxiliary pole portions disposed between the through holes. The stator core has a plurality of teeth radially extending at equal intervals in a circumferential direction to face the rotor core. Each of auxiliary pole has a circumferential width that is 30%-55% of a circumferential width of each tooth. The minimum torque of the generator motor can be increased while torque ripple is reduced.

Abstract: An interior permanent magnet synchronous motor wherein cogging torque and torque pulsation during feeding of electricity can be both restrained. 2p (p: a positive integer of 1 or more) magnetic salient pole sections consists of two groups of magnetic salient pole sections, a first group of which consists of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while having one magnetic salient pole section of a second group interposed between each of two adjacent magnetic salient pole sections, and the second group of which consists of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while having one magnetic salient pole section of the first group interposed between each of two adjacent magnetic salient pole sections. The open angle &agr; 1 of the p magnetic salient pole sections of the first group is smaller than the open angle &agr; 2 of the p magnetic salient pole sections of the second group.

Abstract: For achieving a constant capacity range by way of field weakening of a permanent magnet excited drive the magnetic transverse resistance (Rm) of the rotor plate pack is increased by pole gaps (P1, P2), which are produced by milling into the upper surface (O) of the rotor plate section (L), or are punched into the rotor plate section (L), whereby a covering of the poles of Tp in the range of from 70% to 80% has been shown to be particularly advantageous.

Abstract: A permanent magnet rotating electric machine uses no skewing under a predetermined current and voltage condition to prevent torque from decreasing and to decrease pulsation torque to make the machine less vibrating and less noisy. The permanent magnet rotating electric machine includes a stator with multi-phase stator windings and a rotor with a plurality of permanent magnets internally embedded in a rotor core. The core shape of the rotor is uniform in the depth (longitudinal) direction with no skewing in the arrangement of the permanent magnets. The permanent magnets are symmetrical with respect to the rotation direction, but irregular with respect to the depth direction, for each pole. A magnetic flux generated from the between-pole permanent magnets almost equals a magnetic flux generated from the pole-center permanent magnet.

Abstract: An AC servo motor in which annular polar anisotropic magnets, formed by splitting an anisotropic magnet into two or more portions in an axial line direction, are used in a rotor. The magnetic poles of the split annular polar anisotropic magnets are disposed so as to be shifted by a predetermined angle &thgr;′ which is greater than a skew angle &thgr; determined based on the number of torque ripples per rotation of the rotor determined by the number of magnetic poles and the number of slots in a stator-side iron core. The predetermined angle &thgr;′ is the angle obtained after adding to the skew angle &thgr; a value which takes into consideration magnetic interference between the magnets. The invention provides an AC servomotor which can be controlled with high precision as a result of reducing cogging torque generated between the magnet and the stator-side iron core.

Abstract: An electric synchronous machine with improved torque characteristic has a stator and a rotor, wherein the stator includes a winding, preferably a three-phase AC winding, with an average coil width &tgr;sp. The rotor is provided with permanent magnets and has a pole pair number of 2p with a pole pitch width &tgr;p, wherein the pitch ratio &tgr;sp/&tgr;p is ≧2.5.

Abstract: A circumferential confronting type motor includes an armature core that has drive coils wound around its plurality of poles, and a drive magnet positioned opposite to the armature core in the radial direction. The drive magnet has a plurality of divided magnetized sections, each with a magnetic center, formed separated from each other in the axial direction by a non-magnetized section. The magnetic centers of the respective plurality of divided magnetized sections are provided in symmetrical positions with respect to a magnetic center in the axial direction of the armature core. Further, electromagnetic action between the drive magnet and the armature core causes the two to rotate relatively, while magnetic action between the plurality of divided magnetized sections and the armature core regulates their relative movements in the axial direction.

Abstract: An outer rotor type brushless direct current motor has an outer rotor including a plurality of permanent magnets attached along the inner circumference of an annular yoke such that the magnetic poles face the S magnetic poles. Thin sections are formed by chamfering the radially outer periphery of the two end sections in the circumferential direction of each of the permanent magnets. Magnetic flux passage sections of the yoke providing connection between the thin sections of adjacent permanent magnets are expanded radially inwards. In accordance with the above-mentioned arrangement, the cross section of the magnetic path in the magnetic flux passage sections is increased, thereby suppressing the occurrence of magnetic saturation and preventing the maximum torque of the permanent magnets from decreasing while reducing their size. Moreover, because the magnetic flux passage sections of the yoke are expanded radially inwards, the external dimensions of the yoke do not increase.

Abstract: A permanent magnet rotating electric machine that comprises a stator, into which concentratively wound armature windings are inserted in such a way as to surround a plurality of teeth formed in a stator core, and a rotor having permanent magnets accommodated into a plurality of permanent magnet inserting holes formed in a rotor core. In this rotating electric machine, the permanent magnets are convex V-shaped or U-shaped with respect to a rotor axis. Moreover, nearly V-shaped recess portions, each of which is placed between adjacent poles, are formed in outer circumferential surface portions of the rotor core. Thus, torque caused by magnetic flux due to the magnets is increased, while armature reaction magnetic flux generated by an armature current is reduced. Consequently, q-axis inductance is reduced, so that armature current commutation is quickly achieved.

Abstract: A rotor and each magnet are configured to satisfy one of the following conditions: (D&pgr;/Z)×n+T<X<(D&pgr;/Z)×(n+1)−T and (D&pgr;/Z)×(n−1)+T<X<(D&pgr;/Z)×n−T. Here, Z is a number of cores. D is an outer diameter of the rotor. T is a circumferential dimension of a tooth of each core. X is a circumferential dimension between a circumferentially innermost one of first and second opposing points of a first tapered portion and a circumferentially innermost one of first and second opposing points of a second tapered portion. The first and second opposing points radially oppose first and second imaginary end circles, respectively, defined by outer peripheral surfaces of the cores. Furthermore, n is the number of the teeth that are entirely placed within a range defined by X when a circumferential center of one of the teeth is radially opposed to a circumferential center of the range defined by X.

Abstract: A permanent magnet type stepping motor capable of exhibiting increased rotational angle accuracy and static angle accuracy minimizing a reduction in static torque. The permanent magnet type stepping motor includes a permanent magnet element having n (n: a positive integer of 4 or more) N magnetic poles and n S magnetic poles. A pitch between each adjacent two pole teeth of claw pole type yoke units is set to be constant. Magnetic center-magnetic center pitches between respective adjacent two of the n N magnetic poles and those between respective adjacent two of the n S magnetic poles are not set to be constant at 360°/n but defined to include two or more different pitches between more than 270°/n and less than 450°/n. Also, magnetic center-magnetic center pitches of respective adjacent two of the magnetic poles of the rotor are not set to be constant but defined to include two or more different pitches between more than 135°/n and less than 225°/n.

Abstract: The present invention provides a permanent magnet rotating electric machine comprising a stator, a rotor having a rotor core and permanent magnets inserted into the rotor core, wherein the permanent magnets are shaped like an arc convex toward the stator and a flat surface facing toward the stator is provided at a tip end portion of each of the teeth of the stator.

Abstract: An electric machine comprising the following features: (a) an outer, first stator part and an inner, second stator part, the two stator parts being coaxial and being radially spaced apart by an intermediate space; (b) each stator part has, facing the intermediate space, a circumferential series of stator poles, at least a partial number of which carries a winding; (c) a rotor part disposed in the intermediate space; (d) the rotor part has a circumferential series of alternating permanent magnets and magnetic flux conducting pieces, said permanent magnets being magnetized in circumferential direction; (e) the width of the permanent magnets—measured in circumferential direction—is larger on the central radius of the rotor part than radially outside and radially inside on the rotor part and the width of the magnetic flux conducting pieces—measured in circumferential direction—is correspondingly smaller on the central radius of the rotor part than radially outside and radially inside on th

Abstract: An electromotive machine comprises a stator element and a rotor element, the stator element including at least one set of four toroidally shaped electromagnetic members, the electromagnetic members arranged along an arc a predetermined distance apart defining a stator arc length. Each of the members has a slot, and the rotor element comprises a disc adapted to pass through the slots. The disc contains a plurality of permanent magnet members spaced side by side about a periphery thereof and arranged so as to have alternating north-south polarities. These permanent magnet members are sized and spaced such that within the stator arc length the ratio of stator members to permanent magnet, members is about four to six. The electromagnetic members are energized in a four phase push-pull fashion to create high torque and smooth operation.

Abstract: A rotor (11) for a synchronous motor is provided with a plurality of magnets (15) being substantially V-shaped in cross-section. The V-shaped cross-section is defined by an inner V-surface (25), an outer V-surface (19) and an outward face (23) facing outwardly. A first angle &agr; is subtended between a first straight line connecting a point of intersection (31) of the outer V-surface (19) and the outward face (23) and a second straight line connecting the center (35) of the rotor (11) and the acute angle point (27). A second angle &bgr; is subtended between the first straight line and a third straight line connecting a point of intersection (33) of the inner V-surface (25) and the outward face (23). By setting the angle &bgr; to be larger than 20 percent of the angle &agr;, leakage flux at both ends of the magnets (15) is reduced.

Abstract: There is provided a stepping motor of low vibration realized by reducing cogging with a simple structure while maintaining the performances such as torque.

Abstract: A a rotating electromagnetic actuator with limited stroke, including at least 2N poles on the stator, N being a whole number, energized by at least one energizer coil and N magnetized parts on the rotor arranged in an air gap of thickness E wherein each magnetized part is juxtaposed with at least one ferromagnetic part with a thickness e between 0 and E, defining one or two air gaps with a total length of E-e.

Abstract: A motor comprises a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a turn, and a rotor incorporating plural permanent magnets. The rotor is rotated and driven by utilizing reluctance torque in addition to magnetic torque. Since the winding is not crossed, the size of the coil end is reduced.

Abstract: The invention relates to a rotor for an electrical machine, specially a transversal flow machine, having at least one pole structure. The pole structure encompasses two adjacent rows of magnet arrangements which are alternatively magnetized in the peripheral direction. The rows are separated by an intermediate layer made of magnetically and electrically non-conductive material (intermediate ring). The magnet arrangements having of inter-lying collector and soft iron elements. The magnet arrangements interlock with adjacent collector or soft iron elements in the peripheral direction. The collector or soft magnet elements are at least partially provided with an insulating layer. The invention is characterized in that at least one of the collector or soft iron elements that is adjacent in the periphery of the magnet arrangement is devoid of a radially external stop providing at least indirect support for the magnet arrangements in radial direction.

Abstract: A rotor is provided for a permanent magnet type rotating machine having a stator 1 with armature windings 11. The rotor 3 includes a rotor core 31 and a plurality of permanent magnets 32 arranged in the rotor core 31 so as to negate magnetic flux of the armature windings 11 passing through interpoles 3b. The rotor 3 is constructed so that the average of magnetic flux in an air gap 2 between the rotor 3 and the stator 1, which is produced by the permanent magnets 32 at the armature windings' de-energized, ranges from 0.1 [T] to 0.7 [T] and the ratio (Lq/Ld) of self-inductance of the magnetic portion in a hard-magnetizing direction (q-axis) to self-inductance in an easy-magnetizing direction (d-axis) under a rated load condition ranges from 0.1 to 0.8. Under these conditions, it is possible to realize the rotating machine which operates as an induction machine at the machine's starting and also operates as an synchronous machine at the rated driving due to smooth pull-in.