Rotor for modulated pole machine
A magnetic pole modulation and rotor technology, applied in the magnetic circuit rotating parts, magnetic circuit shape/style/structure, magnetic circuit, etc., can solve the problems of low power factor, large leakage flux, expensive, etc., and achieve increased thickness and cut-off Effects of area, efficient magnetic flux concentration, and simplified manufacturing
Inactive Publication Date: 2013-05-22
HOGANAS AB
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Problems solved by technology
However, one of the disadvantages of such designs is that they are usually relatively expensive to manufacture and they experience large leakage fluxes, which results in low power factor and requires more magnetic material
Low power factor requires an increased size of the power electronics (or power supply when the machine is used synchronously), which also increases the size, weight and cost of the overall drive
Method used
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[0051] In the following description, reference is made to the accompanying drawings, which show by way of illustration how the invention may be practiced.
[0052] The present invention is in the field of a modulated pole electrical machine 100 , an example of which is shown in a schematic exploded perspective view in FIG. 1 a . A fundamental feature of the modulated pole motor stator 10 is the use of a central single coil 20 which magnetically feeds a plurality of teeth 102 formed by a soft magnetic core structure. The stator core is then formed around the coils 20, whereas for other general electric machine constructions the coils are formed around individual tooth core sections. Examples of pole-modulated machine topologies are sometimes identified as claw poles, bird's feet, Rendell machines, or TFM machines. More specifically, the illustrated modulated pole motor 100 comprises: two stator core sections 14, 16 each comprising a plurality of teeth 102 and being substantial...
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A rotor for an inner-rotor modulated pole machine, the rotor being configured to generate a rotor magnetic field for interaction with a stator magnetic field of a stator of the modulated pole machine, wherein said rotor is adapted to rotate around a longitudinal axis of the rotor; wherein the rotor comprises a plurality of permanent magnets arranged circumferentially around the longitudinal axis, each permanent magnet being magnetised in a direction of magnetisation so as to generate a magnetic flux; a plurality of axial flux guiding members each adapted to provide an at least two-dimensional flux path for the magnetic flux generated by a respective one of the plurality of permanent magnets; a support structure comprising an inner tubular support member arranged radially inward of the plurality of permanent magnets; and at least one outer flux guiding member adapted to provide a path in at least a radial direction for the magnetic flux generated by one or more of the plurality of permanent magnets.
Description
technical field [0001] The present invention relates to rotors for modulated pole machines, such as electric motors, and more particularly to rotors for modulated pole machines which are readily mass-producible and suitable for operation at high speeds. Background technique [0002] Over the years, electric machines such as modulated pole machines (eg claw pole machines, Rendell machines, and transverse flux machines (TFM)) have gained increasing attention. Electric machines using the principles of these machines were first disclosed by Alexandersson and Fessenden around 1910. One of the most important reasons for the growing interest is that the design enables extremely high torque outputs such as those associated with induction motors, switched reluctance machines and even permanent magnet brushless machines. Furthermore, an advantage of such machines is that the coils are generally easy to manufacture. However, one of the disadvantages of such designs is that they are u...
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IPC IPC(8): H02K1/27
CPCH02K1/276H02K21/145H02K1/2773H02K1/27
Inventor G·阿特金森A·杰克L-O·彭纳德
Owner HOGANAS AB