Electric micromotor
AssigneeDr. Fritz Faulhaber GmbH & Co. KG
InventorHerbert Wallner
Life of this patent
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Abstract
A miniature electric motor (1) with an outer diameter (DA) that is smaller than or equal to 6 mm, has a hollow cylindrical stator (2) with stator coils (8) and a magnetic rotor (4) rotatably arranged around a rotational axis (16) in the stator (2) by means of a rotor shaft (10). The stator coils (8) can be energized in order to generate a magnetic rotational field in dependence upon the rotational position of the magnetic rotor (4). A sensor chip (20) having at least one magnetic field sensor (22) is arranged in such a manner in an area axially adjacent to a front face of the magnetic rotor (4) located within a plane that is vertical to the rotational axis (16) that the magnetic field sensor (22) is impinged in such a way by the magnetic field that the rotational position of the rotor can be evaluated.
Claims17
A miniature electric motor (1) with an outer diameter (DA) that is smaller than or equal to 6 mm, comprising,
- a hollow cylindrical stator (2) with stator coils (8),
- a magnetic rotor (4) arranged so as to rotate around a rotational axis (16) in the stator (2) by means of a rotor shaft (10), wherein the stator coils (8) can be energized in order to generate a magnetic rotational field in dependence upon the rotational position of the magnetic rotor (4),
- a sensor chip (20) arranged concentrically with respect to the rotational axis (16), having at least four magnetic field sensors (22), and arranged in an area axially adjacent to a front face of the magnetic rotor (4) located within a plane that is vertical to the rotational axis (16) for the purpose of detecting the rotational position of the magnetic rotor (4), wherein the sensor chip (20) is spaced from an adjacent front face of the magnetic rotor (4) via an axial gap (A) in such a way that the magnetic field of the magnetic rotor (4) passes through several components until it reaches the area of the sensor chip (20) and that the magnetic field sensors (22) are impinged in such a way by the magnetic field of the magnetic rotor (4) that the magnetic field can be evaluated in order to determine the rotational position of the rotor.
A miniature electric motor (1) with an outer diameter (DA) that is smaller than/equal to 6 mm, comprising a hollow cylindrical stator (2) with stator coils (8), a magnetic rotor (4) arranged so as to rotate around a rotational axis (16) in the stator (2) by means of a rotor shaft (10), wherein the stator coils (8) can be energized in order to generate a magnetic rotational field in dependence upon the rotational position of the magnetic rotor (4),
- a sensor chip (20), having at least one magnetic field sensor (22), is arranged in an area axially adjacent to a front face of the magnetic rotor (4) located within a plane that is vertical to the rotational axis (16) for the purpose of detecting the rotational position of the magnetic rotor (4), the magnetic field sensor (22) is impinged in such a way by the magnetic field of the magnetic rotor (4) that the magnetic field can be evaluated in order to determine the rotational position of the rotor, wherein the sensor chip (20), which is preferably configured according to the flip chip technology, is electrically connected via a flexible conductor foil (26), wherein the flexible conductor foil (26) has a chip carrier section (34) connected to the sensor chip (20) and a stator section (36) electrically connected to the stator coils (8), wherein the chip carrier section (34) and the stator section (36) are arranged in two parallel and offset planes and are mutually connected via a folded-over connecting section (38).
Dependencies are inferred from the claim text.