Abstract: To provide an orientation device capable of efficiently orientating resinous magnets filled in slits of a rotor core. An orientation device comprising a plurality of permanent magnets 5 disposed at the same intervals as slits 2 in the rotor core 1 with their magnetic poles of the same polarity adjacent to each other, along the outside circumference of a rotor core housing section 4 for housing the rotor core 1, and a plurality of pole pieces 6 disposed between the plurality of permanent magnets 5, wherein the width of the pole piece 6 at the end 6a on the side of the rotor core housing section 4 is no larger than the maximum width &agr; max of an outermost slit 2a of the rotor core 1 between opposite ends thereof.

Abstract: An electromagnetic machine is provided. The machine includes a stator extending along a longitudinal axis and having an inner surface defining a rotor receipt cavity. The rotor extends along and is rotatable about the longitudinal axis within the rotor receipt cavity. A plurality of ring assemblies are supported on the rotor and a plurality of magnets are circumferentially spaced about the rotor and extend through the ring assembly. Each magnet is generally parallel to the axis of the rotor.

Abstract: An electrical rotating machine having a rotor comprising a shaft made from nonmagnetic material, a plurality of pole pieces made from magnetic material and surrounding the shaft, with permanent magnets fixed in receivers by wedges cooperating with the pole pieces to block radially outward movement of the magnets.

Abstract: An electromagnetic machine is provided. The machine includes a stator extending along a longitudinal axis and having an inner surface defining a rotor receipt cavity. The rotor extends along and is rotatable about the longitudinal axis within the rotor receipt cavity. A plurality of ring assemblies are supported on the rotor and a plurality of magnets are circumferentially spaced about the rotor and extend through the ring assembly. Each magnet is generally parallel to the axis of the rotor.

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: A number of embodiments of mechanisms for rotating electrical machines wherein the cogging torque of the machine can be effectively cancelled by generating a cancellation cogging torque. This can be done either mechanically or electrically and in some embodiments, the cancellation mechanism can be disabled under conditions when cogging presents no significant problem.

Abstract: A composite powder metal disk for a rotor assembly in a surface permanent magnet machine. The disk includes permanent magnets on the surface of an inner ring of magnetically conducting powder metal compacted and sintered to a high density. In one embodiment, the permanent magnets are separated by magnetically non-conducting powder metal compacted and sintered to a high density. A rotor assembly is also provided having a plurality of the composite powder metal disks mounted axially along a shaft with their magnetic configurations aligned. A method for making the composite powder metal disks is further provided including filling a die with the powder metals, compacting the powders, and sintering the compacted powders.

Abstract: A rotor structure for a motor having built-in type permanent magnet includes a multiplicity of axial slots for containing 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 axial magnet slot where the radius of the circular arc is smaller than the radius of the rotor. The petal-shaped convex polar portion provides an approximately sinusoidal distribution of air-gap magnetic flux that can improve the disadvantage of being excessive cogging torque of the motor, weaken the armature reaction of the motor, and prevent the permanent magnet 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: An electric machine or assembly 10 including a housing 12, a stationary stator 14, two substantially identical and opposed rotors 16, 18, and a pair stationary field coils 22, 24. Field coils 22, 24 are selectively energizable to controllably vary the flux generated by assembly 10, thereby allowing assembly 10 to provide a relatively constant output torque, power, or voltage over a relatively wide range of operating speeds.

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: The invention provides a movable magnet type instrument able to reduce cost and an instrument device using this movable magnet type instrument. The movable magnet type instrument M1 has a rotor magnet 1 magnetized such that adjacent magnetic poles are poles different from each other; a pair of coils 5, 6 arranged around this rotor magnet 1 and having winding central axes C1, C2 crossing each other without being perpendicular to each other; control means 120 for processing an input signal based on a measured amount and supplying a driving signal mutually having a different electrical angle to each of the coils 5, 6 and rotating and operating the rotor magnet; and a pointer 9 for rotating the rotor magnet 1 as a driving source; wherein, when the number of magnetic poles of the rotor magnet 1 is set to n and an acute angle formed by crossing the winding central axes C1, C2 is set to r, the acute angle r is set to an angle calculated by 360/2n (n is a multiple of 2 equal to or greater than 4).

Abstract: An interior permanent magnet synchronous motor capable of significantly restraining cogging torque and torque pulsation during feeding of electricity thereto. Each of the outer peripheral surface sections of a rotor core and a magnetic pole surface of each of magnetic poles of a stator core are arranged so as to have a gap defined therebetween and having a size &dgr;d which satisfies an expression &dgr;d=&dgr;d0/cos(p&thgr;d), wherein &dgr;d0 is a size of the gap which is determined along a virtual center line defined so as to extend through centers of two virtual lines extending from a center of a shaft through both ends of the outer peripheral surface section defined in a peripheral direction thereof and &thgr;d is an angle between the virtual central line and each of the virtual lines.

Abstract: Reduction of cogging torque and torque pulsation in the rotor with permanent magnets embedded therein. In a rotating electrical machine comprising a stator 5 with an armature winding wound on the stator core and a rotor 1 with permanent magnet 2 embedded in the rotor core 9, a magnetic flux short circuit preventive hole 3 radially extending from the circumferential ends of the permanent magnets 2 (in the vicinity of q-axis) to the vicinity of outer periphery of the rotor core is further extended toward the d-axis (circumferential direction). At the same time, the distance between the outer periphery of the magnetic flux short circuit preventive hole 3 and that of the rotor core is increased gradually in conformity to the approach to d-axis side from q-axis.

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: A rotor assembly for a brushless motor is disclosed. In an exemplary embodiment of the invention, the rotor assembly includes a core having a central opening for insertion of a rotor shaft therein. A plurality of rotor magnets disposed upon a periphery of the core, wherein a space is defined between one of the plurality of rotor magnets and another of the plurality of rotor magnets. A portion of said core occupies said space, thereby defining a salient pole therewithin.

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: In an ultra-permanent-magnet-type electric rotating machine including a stator in which a winding of armatures is wound in each of a plurality of slots of a stator core, and a rotor having permanent magnets respectively inserted into permanent-magnet-inserting holes in a magnetic steel sheet ring provided at an outer periphery of a conductive and magnetic shaft, the thickness of the stator core is 0.1 to 0.2 mm, and the magnetic steel sheet ring is made of a high-tensile-strength magnetic steel sheet had tensile strength of 80 kg/mm2 or more.