Electric motor assembly
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorsMarcel Kuhn, Roman Nestlinger, Ignacio Serrahima
Life of this patent
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Abstract
An electric motor assembly (10), in particular for driving a vehicle, comprises an electric motor (12), a magnetic sensor (46) and a shield (14), the electric motor (12) being equipped with a stator (16), a rotor (18) and at least one magnet (28) which is connected to the rotor (18) for conjoint rotation therewith and generates a measuring magnetic field (MM). The magnetic sensor (46) is located in the measuring magnetic field (MM) and is connected to the shield (14), and the shield (14) has high magnetic permeability and is closed in the area of the magnetic sensor (46).
Claims15
An electric motor assembly configured to drive a vehicle, the assembly comprising:
- an electric motor comprising a stator, a rotor, and at least one magnet that is connected to the rotor in a rotationally fixed manner and which generates a measuring magnetic field;
- a magnetic field sensor;
- and
- a shield,
- wherein the magnetic field sensor is situated in the measuring magnetic field and connected to the shield,
- wherein the shield has high magnetic permeability and is closed in the area of the magnetic field sensor,
- wherein the magnet is mounted on a shaft of the electric motor,
- wherein the shaft has a cavity at an end of the shaft, wherein the end of the shaft is open in an axial direction,
- wherein the magnet is fastened in the cavity to an inner side of the shaft,
- wherein the magnetic field sensor is provided in the cavity at a radial inner side of the magnet, and
- wherein the shield has a base part and a sensor holder, wherein the base part is closed in an area of an axis of rotation.
An electric motor assembly configured to drive a vehicle, the assembly comprising:
- an electric motor comprising a stator, a rotor, and at least one magnet that is connected to the rotor in a rotationally fixed manner and which generates a measuring magnetic field;
- a magnetic field sensor;
- and
- a shield,
- wherein the magnetic field sensor is situated in the measuring magnetic field and connected to the shield,
- wherein the shield has high magnetic permeability and is closed in the area of the magnetic field sensor,
- wherein the magnet is mounted on a shaft of the electric motor,
- wherein the shaft has a cavity at an end of the shaft, wherein the end of the shaft is open in an axial direction,
- wherein the magnet is fastened in the cavity to an inner side of the shaft,
- wherein the magnetic field sensor is provided in the cavity at a radial inner side of the magnet, and
- wherein the shield has a base part and a sensor holder, wherein an opening is provided in the base part in an area of an axis of rotation, and
- wherein the opening is closed by the sensor holder.
An electric motor assembly configured to drive a vehicle, the assembly comprising:
- an electric motor comprising a stator, a rotor, and at least one magnet that is connected to the rotor in a rotationally fixed manner and which generates a measuring magnetic field;
- a magnetic field sensor;
- and
- a shield,
- wherein the magnetic field sensor is situated in the measuring magnetic field and connected to the shield,
- wherein the shield has high magnetic permeability and is closed in the area of the magnetic field sensor, and
- wherein at least one current conductor is provided in the rotor, the current conductor being situated with respect to the magnet such that a perturbing magnetic field induced by a current through the current conductor in the area of the measuring magnetic field is substantially parallel to the measuring magnetic field.
Dependencies are inferred from the claim text.