Abstract:
An electrical rotating machine having a stator or a rotor with a core that includes a plurality of tapered pole pieces is a low loss electrical machine that results in improvements such as higher output power, higher torque and higher efficiency than a machine that does not have tapered pole pieces. The stator or the rotor with tapered pole pieces may be applied to a power train in automobiles, power tools, and various appliances. A method of constructing the core includes winding an iron-based amorphous magnetic alloy ribbon to form a cylinder-shaped core, then heating, impregnating with resin, and machining the cylinder-shaped core to form a plurality of tapered pole pieces being separated in an alternating manner by a plurality of slots. The cores having an outside diameter in a range of 50 mm-1200 mm, a tapered angle in a range of 10°-45°, and a slot depth in a range of 10 mm-210 mm are advantageous.
Abstract:
A wind turbine component (18) includes an inner member (32) and an outer member (34) disposed relative to the inner member (32), wherein the inner and outer members (32, 34) move relative to each other. A plain bearing (200) is coupled to one of the inner or outer member (32, 34) and configured to provide a fluid film (202) for maintaining separation of and facilitating relative movement between the inner and outer members (32, 34). A position adjustment mechanism (78) is coupled to the one of the inner or outer member (32, 34) for selectively moving the plain bearing (200). A position controller (176) may be operatively coupled to the position adjustment mechanism (78) for controlling the position of the plain bearing (200). The wind turbine component may be a wind turbine generator (18) with the inner member and outer member corresponding to one of the stator and rotor assemblies (32, 34). Methods for controlling the generator are also disclosed.
Abstract:
An arrangement to ensure an air gap in an electrical machine is provided. The electrical machine has a stator arrangement and a rotor arrangement, wherein an air gap is defined by a distance between parts of the rotor arrangement and parts of the stator arrangement. A cross section of the air gap changes along the certain length. The stator arrangement includes a stator support structure and a lamination stack, wherein the stator support structure has support elements for a two-sided support of the lamination stack, the support elements being ring-shaped and connected via a single main bearing to the rotor arrangement. Elements of the ring-shaped support element show different diameters in reference to the longitudinal axis. A first diameter of a first element of the ring-shaped support element is greater than a second diameter of a second element of the ring-shaped support-element.
Abstract:
An arrangement to compensate a non-uniform air gap, which is located in an electric machine is provided. The electrical machine includes a stator arrangement and a rotor arrangement. The rotor arrangement rotates around a longitudinal axis. At least parts of the rotor arrangement interact with parts of the stator arrangement to generate electrical power. The air gap is defined by the distance between the parts of the rotor arrangement and the parts of the stator arrangement. The parts of the stator arrangement are opposite to the parts of the rotor arrangement along a certain length. The cross section of the air gap changes along this length thus the air gap is not uniform in view to the referred certain length. The flux density of magnets, which are part of the rotor arrangement, is changed in dependency to the cross section of the air-gap.
Abstract:
Rotor arrangement for a generator is disclosed. The rotor arrangement includes a rotor including a number of circumferentially adjacently disposed magnetic elements, at least one axially extending spacer element is disposed between at least two circumferentially adjacently disposed magnetic elements.
Abstract:
A method, apparatus, system and computer-readable medium for designing and/or simulating electrodynamic machinery are disclosed to, among other things, optimize one or more performance characteristics by manipulating structural and/or functional characteristics of the constituent components of an electrodynamic machine. According to the various embodiments, a motor designer can create a new motor design by modeling a rotor-stator structure to design and/or simulate electrodynamic machines that implement, for example, conically shaped magnets and accompanying field pole members.
Abstract:
Method for fabricating an electric miniature motor, substantially comprising a housing assembly, a rotor assembly, a power transmission and bearing assembly and a second bearing assembly, wherein the housing assembly comprises a housing tube having a division extending in the axial direction over an entire length of the housing tube, comprising the following steps of a) inserting a cylindrical core having a defined outer diameter into the housing assembly; b) adjusting an inner diameter of the housing assembly to an outer diameter of the core; c) fixing the inner diameter of the housing assembly by fixing the housing tube in an area of the division; and d) removing the cylindrical core.
Abstract:
A brushless motor includes: a stator assembly including a stator core which includes a plurality of pole teeth each having a winding therearound; and a rotor assembly including a magnet which has a ring shape, is rotatably disposed so as to oppose the pole teeth of the stator core and which is circumferentially magnetized with a plurality of magnetic poles with opposite polarities alternating with each other, wherein the number of the pole teeth of the stator core is twice the number of the magnetic poles of the magnet such that each magnetic pole opposes a pair of adjacent pole teeth, one pair of adjacent windings have the same number of winding turns and the same winding direction as each other, and wherein another pair of windings located next to the one pair of windings have a winding direction opposite to the winding direction of the one pair of windings.
Abstract:
Disclosed herein are an electromagnetic module for a spindle motor including a shaft and a spindle motor having the same. The electromagnetic module includes: an armature including a core and a coil wound around the core; and a magnet facing the armature, wherein the magnet is provided with a protrusion part disposed over the core. The spindle motor includes: a rotor part including a shaft, a hub, and a magnet; a stator part including a sleeve rotatably supporting the shaft, a base having the sleeve coupled thereto, and an armature facing the magnet, fixedly coupled to the base, and including a core and a coil; and a fluid dynamic bearing part formed between the rotor part and the stator part by being filled with oil, wherein the magnet is provided with a protrusion part disposed over the core.
Abstract:
An assembly for supporting a motor of a vehicle powertrain includes a housing, a stator secured to the housing, a bearing having a radial position established by the housing, a member contacting the bearing, and a rotor secured to the member and including a radial outer surface spaced radially from the stator by an air gap established by contact between the bearing and the member.