Electric motor with angle sensor, e.g., hollow shaft encoder

The electric motor according to one of the preceding claims,

• characterized in that
• the hollow shaft of the angle sensor is connected to the attachment shaft in the connection region, in particular in a force-locking manner,
• and/or in that
• an elastic ring, in particular an O-ring, is arranged between the rotor shaft and the second non-circular portion,
• in particular wherein the elastic ring is arranged radially outside the cylindrical portion that effects the centering fit,
• in particular wherein the elastic ring bears against an end face, in particular an axial end face, of the second non-circular portion facing away from the connection region and/or against an end face, in particular an axial end face, of the rotor shaft facing the second non-circular portion,
• in particular wherein the ring axis of the elastic ring is oriented parallel to the axis of rotation of the rotor shaft.

The electric motor according to one of the preceding claims,

• characterized in that
• a fan is fitted onto the rotor shaft and connected for conjoint rotation with the rotor shaft,
• wherein the region covered by the fan in the axial direction overlaps with or comprises the region covered by the internally threaded region and/or thread run-out region in the axial direction.
• in particular wherein fan blades are formed on the fan that are evenly spaced from one another in the circumferential direction.

The electric motor according to one of the preceding claims,

• characterized in that
• the clear inside diameter of the fan or the outside diameter of the rotor shaft in the region covered by the fan in the radial direction is smaller than the largest outside diameter of the second non-circular portion,
• and/or in that
• the largest outer diameter of the second non-circular portion is larger than the largest outer diameter of the connection region and than the largest outer diameter of the first non-circular portion.

The electric motor according to one of the preceding claims,

• characterized in that
• the first non-circular portion is an outer non-circular portion, in particular an outer hexagonal portion, or an inner non-circular portion, in particular an inner hexagonal portion,
• and/or in that
• the second non-circular portion is an outer non-circular portion, in particular an outer hexagonal portion.

The electric motor according to one of the preceding claims,

• characterized in that
• the guide region is formed as the jacket surface of a circular cylinder
• or that
• instead of the guide region and the cylindrical region that effects the centering fit, a conically shaped region is formed on the attachment shaft, which region is arranged axially between the threaded region of the attachment shaft and the second non-circular portion,
• in particular wherein the outer diameter of the conical region increases monotonically, in particular strictly monotonically, with decreasing distance from the second non-circular portion.

The electric motor according to one of the preceding claims,

• characterized in that
• the hollow shaft of the angle sensor is connected to the connection region of the attachment shaft in a force-locking manner,
• wherein a seal, in particular a sealing ring such as an O-ring, is arranged between the hollow shaft and the second non-circular portion, which seals the hollow shaft towards the second non-circular portion,
• in particular wherein the seal is arranged radially outside the connection region, i.e. in particular the radial distance region related to the axis of rotation of the rotor shaft and covered by the seal is at a distance from the radial distance region covered by the connection region and related to the axis of rotation of the shaft,
• in particular wherein the seal bears against a finely machined end surface of the attachment shaft,
• in particular wherein the end surface is flat and the normal of the end surface is oriented parallel to the axis of rotation of the rotor shaft,
• in particular wherein the housing of the angle sensor is connected to a housing part, in particular a fan hood, of the electric motor by means of a torque support,
• wherein a shaft seal ring is accommodated in the housing of the angle sensor, which seals towards the hollow shaft, in particular wherein a seal lip of the shaft seal ring bears against the radial outer circumference of the hollow shaft.