An energy conversion system includes rotor, stator and shell components configurations for increasing power efficiency and improving replacement and repair efficiency. The system harvests environmental energy for lower power generation and accounts for non-mechanical sources of rotational resistance within the generator.

A high performance rotating electrical machine which aims at downsizing, and challenges inevitable technical problems such as deterioration of efficiency η caused by copper loss and temperature rise inside the rotating electrical machine due to heat generation induced by eddy current generated in magnetic body.

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.

A rotor includes a rotor core, a plurality of permanent magnets, and a rotating shaft. The rotor core includes a through-hole, an inner circumference-side rotor core, an outer circumference-side rotor core, an annular portion, a plurality of inner circumference-side ribs, and a plurality of outer circumference-side ribs. The through-hole is provided on a first inner circumference side of magnet insertion holes. The inner circumference-side rotor core is located on a second inner circumference side of the through-hole. The outer circumference-side rotor core is located on an outer circumference side of the through-hole. The annular portion has a substantially annular shape, and is being provided inside the through-hole. The plurality of inner circumference-side ribs connect the inner circumference-side rotor core and the annular portion and are provided at predetermined intervals in a circumferential direction.

A rotor structure for a rotary electric machine in which an inner surface of a hollow rotor core and an outer surface of a shaft inserted into a hole of the rotor core are fitted together by mutual engagement between a projection and a recess to compose a rotor, the rotor structure including: a first retainer brought into contact with one end of the rotor core; and a second retainer brought into contact with a surface of the first retainer opposite to a surface in contact with the rotor core so as to fix the first retainer and the rotor core to the shaft, wherein a coefficient of static friction of a first sliding surface between the first retainer and the second retainer is smaller than any other sliding surface provided in the rotor.

A void group made up of plural voids is formed on an outer circumferential side of a longitudinal end portion of a permanent magnet provided in a rotating electric machine rotor. The void group includes a first void and a second void row where plural second voids are formed at predetermined intervals at a position further radially outwards than the first void. A rib is formed between a pair of adjacent second voids of the second void row. End portions of the first void respectively overlap the pair of adjacent second voids. An imaginary line that extends along the center of the rib passes through at least part of the first void. A magnetic pole center-side end portion of the void group extends from the outer circumferential surface of the permanent magnet towards an outer circumferential surface of a rotor core.

Some embodiments provided rotor assemblies, comprising: a rotor core barrel comprising a wall extending, and at least two compression bridges each formed in the wall proximate one of the lateral ends and separated by a distance; an array of a plurality of magnets positioned on and spaced along the wall between the compression bridges and about a circumference of the rotor core barrel; and one or more pre-stress wraps wrapped over the plurality of magnets and about the rotor core barrel along at least a portion of a length of the rotor core barrel between the compression bridges, wherein the compression bridges enable radial compression deflection, induced by radial compression of the rotor core barrel by the one or more pre-stress wraps, of the wall of the rotor core barrel at the compression bridges relative to the wall of the rotor core barrel proximate the lateral ends.

Each permanent magnet module for a permanent magnet rotor includes a base-plate and a permanent magnet element attached to the base-plate. The base-plate includes a bottom section and an upper section between the bottom section and the permanent magnet element. The permanent magnet modules constitute subsets so that permanent magnet modules of different subsets differ from each other by positions of the upper sections of the base-plates with respect to the bottom sections of the base-plates so that the permanent magnet elements of the permanent magnet modules of the different subsets are axially successive and circumferentially shifted when the bottom sections of these permanent magnet modules are axially successive and circumferentially aligned. Thus, the permanent magnet elements of the permanent magnet modules can be arranged into, for example, skewed rows on a surface of the rotor.

Rotor, in particular permanent magnet rotor, for an electric machine, having a magnet support, a plurality of magnets which are arranged on the magnet support, and a rotor core which is arranged between a shaft and the magnet support, wherein the rotor core comprises plastic.

An electrical machine (20) having a stator (21) and a rotor (22) mounted rotatable with respect to the stator (21) is provided. The rotor (22) comprises at least one magnetic pole pair that has two magnets (23). Further, the rotor (22) comprises at least two recesses (25) that extend at least partially through the rotor (22), the recesses (25) being arranged at opposite sides of the rotor (22), and the number of magnetic pole pairs of the rotor (22) being different from the number of electromagnetic pole pairs able to be generated during operation of the rotor (22). Further disclosed is a method of operating the electrical machine (20).