Abstract:
A permanent magnet rotating machine includes a rotor with a permanent magnet having circumferential magnetic poles with a skew at boundaries between magnetic poles of the permanent magnet, and a stator having a stator iron core in an almost cylindrical shape and convex poles protruding inwardly, the rotor being disposed within the stator. A skew angle of the skew is smaller than a theoretical angle θs (electrical angle) and larger than one-half the theoretical angle θs, wherein the theoretical angle θs is defined as, θs=180×(number of magnetic poles in the rotor)/smallest integer of which both the number of magnetic poles in the rotor and the number of magnetic poles in the stator are factors) [deg.].
Abstract:
A brushless motor A includes a permanent magnet used as a rotor 1 that is driven by three-phase power supply, wherein the permanent magnet is magnetized by a trapezoidal magnetization, and the trapezoidal magnetization is applied such that a generation period of a cogging torque is set to almost half of the generation period of the cogging torque generated when the permanent magnet to which a square magnetization is applied is used. In this brushless motor A, preferably a skew magnetization is also applied to the rotor 1. Further, in case of driven by a sinusoidal-wave current, the skew angle is set to the angle in the range that has ±15% of the reference angle as an upper limit and a lower limit by a combination of a trapezoidal magnetization and a skew magnetization.
Abstract:
An electrical rotating machine in which the laminated magnetic circuit of an external stator includes a stack of yokes each made from a magnetic metal sheet and disposed substantially parallel to a plane perpendicular to the axis and a plurality of teeth disposed inside the yokes, the teeth each being made from a magnetic metal sheet and disposed substantially parallel to a plane perpendicular to the axis, the teeth being stacked and the stacks of teeth delimiting slots, the teeth being bound with the yokes by gluing with resin.
Abstract:
An electrical machine having a machine output rating. The electrical machine including a shaft rotatable about an electrical machine axis, a rotor coupled to the shaft and rotating with the shaft, and a stator including a stator core. The rotor is configurable to include a first rotor portion having a relation to a first output rating and a second rotor portion having a relation to a second output rating. The stator core is configurable to be disposed adjacent to the first rotor portion relative to the machine axis when the machine output rating corresponds to the first output rating and adjacent to the second rotor portion when the machine output rating corresponds to the second output rating.
Abstract:
An electrical rotating machine in which the laminated magnetic circuit of an external stator includes a stack of yokes each made from a magnetic metal sheet and disposed substantially parallel to a plane perpendicular to the axis and a plurality of teeth disposed inside the yokes the teeth each being made from a magnetic metal sheet and disposed substantially parallel to a plane perpendicular to the axis, the teeth being stacked and the stacks of teeth delimiting slots , the teeth being bound with the yokes by gluing with resin.
Abstract:
A rotor for a reluctance type rotating machine includes a rotor core formed by stacking a number of annular core materials each of which includes magnetic concave and convex portions alternately formed on an outer circumference thereof and a central through hole, the rotor core having a key axially extending on an outer circumference thereof, the rotor core being divided into a plurality of blocks, the core materials constituting at least one block having the magnetic concave and convex portions shifted by a predetermined angle relative to the core materials constituting the other or another block on the basis of a center line passing the key, and a rotational shaft inserted through the central hole of the rotor core, the shaft having a key groove engaging the key of the rotor core.
Abstract:
It is intended to suppress the vibration and noise during operation of a concentrated winding electric motor and to provide an electric motor with high efficiency, low vibration and low noise. A skew is formed on at least one of a stator (10) and a rotor (20), arranged with a concentrated winding, and a winding vibration damping body (18) is inserted between windings (13) of different phases within a winding groove (19) and contacted therewith.
Abstract:
A stator 10 has a pair of pole parts 11 extending inwardly in opposite directions. The pole parts 11 are wrapped with inductance coils 12. A rotor 14 is equipped with a pair of permanent magnets 13 that essentially face toward the pole parts 11. The permanent magnets 13 are magnetized radially, and are shifted angularly from positions in direct radial alignment with the pole parts 11. An excitation current is applied to the coils 12 to cause the rotor 14 to move through a specific angular range by a magnetic field induced in the pole parts 11 and magnetic fields of the permanent magnets 13. The radial misalignment between the pole parts 11 and the permanent magnets 13 improves the performance characteristics of the rotary solenoid.
Abstract:
This invention relates to geometric, electrical, and electronic techniques improving torque, power, cost, size, weight, reliability, and efficiency of electric generators and motors using the following: Geometric relationships eliminating lateral magnetic short circuits, providing sine wave output waveforms, and allowing axial extendibility; Radial and axial Permanent Magnet concentration; Speed independent rotating transformer inductive coupling; Precise speed independent rotor position sensing using a threshold and comparator circuit to provide Hall Effect low speed & Back-EMF medium to high speed sensing; Bi-directional Buck-Boost PWM converter topology using H-bridge power transistors, parallel reverse diodes and an H-bridge connected inductor.
Abstract:
There is provided an alternating current generator comprising: a rotatably supported field rotor having a pair of opposed rotor pole cores, each being provided with P/2 claw poles wherein P is an even number, and a field winding wound on the rotor pole cores; an armature core located around the outer periphery of the field rotor and having axially extending 3nP slots wherein n is an integer more than one; n independent sets of three-phase windings, each being wound on the armature core by being inserted in the slots so that the n sets of three-phase windings are shifted from each other by electrical angle of &pgr;/(3n) radians; and three-phase rectifiers connected with the n sets of three-phase windings to rectify output voltages generated by the three-phase windings.