159results about "Prevention/reducing eddy-current losses in winding heads" patented technology

An automotive alternator including a rotor having a plurality of poles; a plurality of phases in operable communication with the plurality of poles; and a stator core in operable communication with the rotor, the stator having a number of slots defined by:

S=(P×PH)+((M×PH)+N)

where S=number of slots P=number of poles PH=number of phases M=a whole integer greater than or equal to 0 N=a whole integer selected from a group of integers ranging from, and including, 1 through the number of phases minus 1. A method for reducing magnetic noise in an automotive alternator includes selecting a number of poles, selecting a number of phases, selecting a number of stator core slots, the foregoing selections interacting in the automotive alternator to produce an order of frequency of a tangential force different than any multiple of the number of phases and different than an order of frequency of a radial force of the alternator.

An electromechanical apparatus includes: a rotor including a central shaft and permanent magnets disposed around a cylindrical surface along an outer circumference of the central shaft, and a stator including hollow electromagnetic coils disposed around a cylindrical surface along an outer circumference of the permanent magnets and a pipe member having a hollow cylindrical shape and disposed between the permanent magnets and the electromagnetic coils, wherein the pipe member is made of a carbon fiber reinforced plastic, and the carbon fiber reinforced plastic is formed by weaving carbon fiber bundles formed of bundled carbon fibers.

A power generator (20) includes a rotor (22), and a stator (23) surrounding the rotor and having opposing ends. The stator (23) includes a stator core (21) and a plurality of windings (28) carried by the stator core creating an undesired axial magnetic field component adjacent the opposing ends of the stator. The power generator (20) may also include at least one counteracting magnetic field generator (30) associated with at least one end of the stator (23) for generating a counteracting magnetic field for counteracting the undesired axial magnetic field component.

A rotating electrical machine, especially a turbogenerator, includes a rotor and a stator, which concentrically surrounds the rotor and is terminated at each of the two axial ends by a laminated press plate (14), which is constructed from a stack of individual press plate laminates (30). The electrical properties are improved by providing the press plate laminates (30) at least partially with slits (26) for reducing the eddy current losses.

A rotation machine is configured such that permanent magnets and pole shoes holding the permanent magnets at the outer diameter side of the permanent magnets are provided for a rotor, and an outer diameter size (Ra) in the axial end portion of the pole shoe is made smaller than an outer diameter size (Rb) in the axial center portion.

In an electric rotating machine, for reducing losses that occur in clamping plates and their shield, the electric rotating machine includes a rotor formed with field winding wound around a rotor core, a stator placed opposite to the rotor at a predetermined space and formed with stator winding wound around a stator core formed by stacking multiple magnetic steel sheets in the axial direction, clamping plates clamping and retaining the stator core from both axial end parts thereof in the stacking direction of the magnetic steel sheets, and a magnetic shield placed around the clamping plates to shield flux leakage flowing into the clamping plates, and the magnetic shield is formed of a cylinder of stacked steel sheets stacked in a form of a cylinder about the rotor shaft and powder magnetic core segments and powder magnetic core segments having portions which are stuck to the cylinder of stacked steel sheets on the stacking cross section, and arranged to cover side surfaces and an inner surface of radial direction of the clamping plates.

An AC asynchronous motor with circumferential windings includes three phases of stator magnetic cores (145, 146 and 147), three phases of circumferential windings (167, 168 and 169), an a asynchronous motor rotor and accessories including a casing and a bearing. the three phases of stator magnetic cores are arranged axially phase by phase, and each phase of stator magnetic core comprises a cylindrical magnetic core, stator magnetic poles arranged in parallel with the axial direction of the cylindrical wall and magnetic circuit connectors; the magnetic poles form a circumferential range, a gap exists between the adjacent magnetic poles, one end of the magnetic pole and one end of the adjacent magnetic pole are connected to the two ends of the cylinder via the magnetic circuit connectors respectively, and the circumferential winding is embedded into an annular space between the magnetic poles and the inner cylindrical wall; and three phases of rotor magnetic cores are aligned and connected in series along the axial direction, busbars in the three phases of rotor slotways share short-circuit rings at the two ends, under the three-phase AC of the three-phase circumferential windings, induction currents of the busbars of the rotors bear a force in a mixed manner, self-startup operation is realized, and loss and end-portion loss of traditional windings are avoided. Thus, the AC asynchronous motor has the advantages including little magnetic flux leakage, simple structure, reduced copper material, less heating, high efficiency and reliability and energy-saving performance.

The invention relates to a winding tooth (3) for a component (2) of an electrical machine (1), in particular for a stator and/or a rotor, comprising: a tooth shaft for being wound with a winding coil (4); and a tooth head (5) which is arranged at one end of the tooth shaft with respect to a winding axis; wherein one or more slots (14) are provided at at least one end section of the winding tooth (3), said slots extending along the winding axis through the tooth head (5), wherein the end section corresponds to a region at one or both ends of the winding tooth (3) along a transverse direction which runs substantially perpendicular to the winding axis.

A motor driving device includes N units (N is a natural number equal to or greater than 2) of inverters configured to control N units of motors, respectively, a×N units (a is a natural number) of cables configured to allow connection between the N units of inverters and the N units of motors, respectively, and a PWM signal output unit configured to transmit a PWM signal to the N units of inverters. The N units of inverters and the a×N units of cables are divided into M groups (M≤N). The PWM signal output unit outputs the PWM signal for driving at least one inverter belonging to each group of the M groups so that the PWM signals have phase differences shifted by 360 degrees/M among the groups.