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US 4,286,184 AGranted
Electronic motor having a multi-pole external rotor
AssigneeSiemens Aktiengesellschaft
InventorsGeorg Kogler, Hans Kuhnlein, Karl Schalk
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AssigneeSiemens Aktiengesellschaft
InventorsGeorg Kogler, Hans Kuhnlein, Karl Schalk
Estimating the term…
An electronic motor has a multi-pole external rotor and a multi-slot stator which is rotatable inside the external rotor. At least two magnetic field sensing elements are arranged in the vicinity of the external rotor and current supply to the stator windings is provided by a commutation device. The prior art stator was provided with obliquely set stator winding slots and involved a complicated winding technique. To eliminate this disadvantage and to be able to use slots lying parallel to the axis, the neutral field lines between each north and south pole of the external rotor are made to lie parallel to the rotor axis in the region of the magnetic field sensing elements and obliquely thereto in the region of the laminated rotor stack.
In an electronic motor having a multipole external rotor comprising a magnet body having north and south poles and adapted to revolve about a rotor axis, a multislot stator fixed inside the external rotor, and at least two magnetic field sensing elements radially disposed between the magnet body and a flux return part and fixed near by the external rotor, the sensing elements furnishing signals dependent on the angular position of the rotor to an electronic commutation device for feeding current to the stator windings, the improvement comprising:
Dependencies are inferred from the claim text.