Abstract:
A stator (2) and a rotor (4) suitable for use in an electric motor or generator. The stator comprises a plurality of stator coils (12) and a support (30) for holding the coils around a rotor of the motor. A cylindrical sleeve (16) is mounted radially inwardly on the support to form a barrier in use between cooling fluid passing over the coils and a rotor located within the stator. The rotor comprises a hub (73), a plurality of rotor segments (50,72), and a plurality of permanent magnets (56). The segments are arranged around the hub in a ring, with the permanent magnets disposed between the segments. A radially outwardly facing exposed surface (58)of each magnet is spaced radially inwardly from an outer cylindrical profile defined by the segments.
Abstract:
The present invention is a high efficiency permanent magnet machine capable of maintaining high power density. The machine is operable over a wide range of power output. The improved efficiency is due in part to copper wires with a current density lower than traditional designs and larger permanent magnets coupled with a large air gap. In a certain embodiment wide stator teeth are used to provide additional improved efficiency through significantly reducing magnetic saturation resulting in lower current. The machine also has a much smaller torque angle than that in traditional design at rated load and thus has a higher overload handling capability and improved efficiency. In addition, when the machine is used as a motor, an adaptive phase lag compensation scheme helps the sensorless field oriented control (FOC) scheme to perform more accurately.
Abstract:
The rotor unit has a plurality of rotating bodies which is arranged along a central axis. Each of the plurality of rotating bodies has an annular rotor core which surrounds the central axis, a plurality of magnets which is arranged in the circumferential direction around the rotor core, and a holder which holds the magnets. Further, the holder has a plurality of partitioning portions each axially extending between the magnets. The axial dimension of the partitioning portion is longer than the axial dimension of the magnet which is held by the partitioning portions. Further, the plurality of rotating bodies is disposed in a state where the circumferential positions of the plurality of magnets are out of alignment. In this way, contact between the magnets is prevented by the partitioning portion. Therefore, damage to each magnet is suppressed.
Abstract:
The invention concerns an AC rotary electric machine, such as a motor-generator comprising: a internal rotor (7) peripherally (6) made of mild steel and provided with permanent magnets (3) with radial magnetisation distributed with alternating N and S poles, said magnets (3) being made of a high induction material; and an annular stator (1) coaxially enclosing the rotor (7) made of mild steel, and having internally radial cores (2) each bearing: an emitter coil (4) arranged opposite to and in the proximity of the rotor and a receiver coil (5) arranged radially rearwards of the receiver coil and magnetically coupled therewith; the emitter coils (4) having their winding direction alternately inverted and being all connected (18) to one another in series, between two terminals (9) supplying electric power to the machine; the receiver coils (5) having all their respective windings in the same direction and being connected (19) to one another in series, between two terminals (10) between which occurs a voltage when the machine is operating.
Abstract:
A rotary pump for pumping fluids through a patient having a housing with an internal region, a stator member and an impeller positioned within the housing and having impeller blades, wherein the impeller is magnetically suspended and rotated, and wherein the geometric configuration of the rotary pump is sized and proportioned to minimize stagnant and traumatic fluid flow within the rotary pump. The plurality of magnetic impeller blades are preferably rare earth, high-energy-density magnets selected from the group consisting of samarium cobalt and neodymium-iron-boron alloy.
Abstract:
An induction generator with a single pair of opposing magnetic poles for generating electric power at a high energy conversion efficiency. This induction generator is provided with a rotating shaft which is driven from the outside, an even number (four or more) of stator cores arranged at intervals on a circle whose centre is the axis of the rotating shaft, a first monopole rotator which is pivotally fitted to the rotating shaft, surrounded by the stator cores, and has first and second magnetic poles which are counterposed to each other in the direction perpendicular to the rotating shaft and have the same polarity, a second monopole rotator which is pivotally fitted to the rotating shaft, counterposed to the first rotor, surrounded by the stator cores, and have third and fourth magnetic poles which are counterposed to each other and have the polarity opposite to that of the first and second magnetic poles, and windings which are respectively wound around the stator cores and connected in a specific manner.