Flat brushless motor for velomobile
published: 05/09/20, 11:38
As part of a velomobile project, I am working on the design of a flat brushless motor, with axial flux (magnetic field parallel to the axis of rotation) in the style of this example. Incorporating a flat motor into a bicycle wheel is much easier to imagine and a flat motor has more torque at lower revs, as a bicycle does.
The stator is central and carries the windings, which facilitates the fixing and the exit of the wires in the case of a wheel (windings, Hall sensors).
The (double) rotor carries the permanent magnets and is integral with the rim.
There is a strong interest in using a arrangement by Halbach for permanent magnets, insofar as this configuration eliminates the need for a ferrous support to "loop" the field lines behind the magnets: these are fixed on a composite plate for example, hence the gain weight...
I'm not good (euphemism!) At magnetism, my lessons are (very) far, but I know how to model, so if anyone can give me some clues based on the first sketches to know what power we can - at first glance - expect such a thing, I'm a taker ^^
Some 3D outputs:
the stator (before inclusion of the windings in the resin ...:
one of the rotors, with the poles of the magnets in red / gray:
The stator is central and carries the windings, which facilitates the fixing and the exit of the wires in the case of a wheel (windings, Hall sensors).
The (double) rotor carries the permanent magnets and is integral with the rim.
There is a strong interest in using a arrangement by Halbach for permanent magnets, insofar as this configuration eliminates the need for a ferrous support to "loop" the field lines behind the magnets: these are fixed on a composite plate for example, hence the gain weight...
I'm not good (euphemism!) At magnetism, my lessons are (very) far, but I know how to model, so if anyone can give me some clues based on the first sketches to know what power we can - at first glance - expect such a thing, I'm a taker ^^
Some 3D outputs:
the stator (before inclusion of the windings in the resin ...:
one of the rotors, with the poles of the magnets in red / gray: