Abstract:
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.
Abstract:
A linear motor is provided including a magnet track including a plurality of permanent magnets, and a coil assembly including a plurality of laminations. The coil assembly defines a plurality of teeth having slots therebetween. The plurality of teeth include (1) two end teeth and (2) at least one non-end tooth arranged between the two end teeth. Each of the two end teeth defines an end profile including a first surface and a second surface. The first surface and the second surface are separated by a step which is substantially perpendicular to a plane defined by the plurality of magnets. The linear motor also includes a plurality of coils at least partially disposed in at least a portion of the slots defined by the plurality of teeth.
Abstract:
A DC linear electric motor-generator has located at each edge of a curved triangular shaped linear ferromagnetic core, electro-magnets or solenoids interconnected in series or parallel as determined by user objectives, with each main solenoid coil hosted by each segment of the ferromagnetic core.
Abstract:
The invention relates to a primary part (2) for an electrical machine (1), with the primary part (2) being formed at least from a laminated core (3) and having at least one element (11) for reduction of the force ripple adjacent to one or both of its respective end faces (S1, S2), with the element (11) being electrically conductive (κel>0) and having negligibly low magnetic permeability (μr≅1).
Abstract:
According to the invention, a system for aiming an antenna in a direction below-horizon is disclosed. The system may include a support member, a spherical structure, and at least one arm. The support member may be coupled with a surface. The spherical structure may be coupled with the support member and the spherical structure may be at least partially spherical in shape about a central point. The at least one arm may be rotatably coupled with the spherical structure. The at least one arm may be coupled with the antenna. The at least one arm may at least partially defines a void. And the support member may be at least partially disposed within the void when the antenna is aimed in the direction below-horizon.
Abstract:
A reliable and cost-efficient direct drive force feedback motor is suitable for joystick applications, allowing multiple degrees of output freedom, requiring no coil commutation, and permitting compact packaging. A multiple degree-of-freedom motor consistent with the invention comprises an output shaft, a stator, and a rotor. The stator comprises first and second lamination stacks, each lamination stack having an interior curved surface and a coil wound thereon, the lamination stacks being disposed adjacent the output shaft. The rotor is fixed to the output shaft and movably supported adjacent the stator with an air gap disposed between the rotor and the stator, the rotor including at least one magnet disposed thereon and being movable along the interior curved surface of the lamination stacks in directions defining at least first and second degrees of freedom. Energization of the coil of the first lamination stack establishes a first magnetic field to urge the output shaft to rotate in a first plane, and energization of the coil of the second lamination stack establishes a second magnetic field to urge the output shaft to rotate in a second plane substantially orthogonal to the first plane.
Abstract:
To reduce the magnetic flux leakage through the gap between magnetic pole teeth of an armature so as to reduce the magnetic attraction force generated between the armature and a needle, an armature unit is provided with two magnetic poles, on the top of which are magnetic pole teeth protruding toward the opposing magnetic pole, where the magnetic pole teeth of the magnetic pole are arranged at two heights, upper and lower, and the magnetic pole teeth of the opposing magnetic pole are arranged at two heights, upper and lower, so that the magnetic flux flows upward and downward alternately between the upper and lower magnetic pole teeth. The needle equipped with permanent magnets moves relatively in the gap between the upper and lower magnetic pole surfaces of the armature unit.
Abstract:
A rotary machine includes at least one rotating member and at least one stationary member positioned such that a clearance gap is defined between a portion of the at least one rotating member and a portion of the at least one stationary member. The clearance gap has a measurable radial dimension and a measurable magnetic flux is generated in the clearance gap at least partially by relative movement between the stationary member and the rotating member. A method of monitoring a clearance gap measurement system for the rotary machine includes providing at least one clearance gap measurement assembly. The measurement assembly has at least one dimension measurement apparatus and at least one magnetic flux measurement apparatus. The method also includes positioning the at least one measurement assembly on the stationary member to facilitate measurements of the clearance gap during operation of the rotary machine.
Abstract:
It is an object to obtain a highly efficient synchronous induction motor by letting the magnetic flux hardly pass in the direction of a q axis without interrupting a magnetic path in the direction of a d axis and by increasing a salient pole difference. A slit next to a shaft 5 is extended towards the shaft along a circumference of the shaft 5 to form an extended part of slit 8a. In addition, a gas vent hole 7 is formed as a slender opening stretched in the direction of d axis, and a slit is projected along the circumference of the gas vent hole 7. Further, the gas vent hole 7 is formed as a slender opening stretched in the direction which is displaced by a predetermined angle from the d axis. Yet further, a rotor iron core 1 is formed by a plurality of rotor iron core portions in the laminating direction, and the rotor iron core portions have different shapes of slits, respectively.
Abstract:
A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof; resulting in a permanent magnet rotating electric machine effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.