A rotor position sensor for a motor vehicle for sensing the rotational position of a rotor of an electric motor includes a sensor housing, in which the components of the rotor position sensor are accommodated. At least part of the sensor housing forms a cover for closing a motor housing of the electric motor.

The disclosure describes techniques to filter unwanted noise from feedback signals of an electrical machine. An electrical machine may receive AC power from an inverter and circuitry in the inverter may cause noise on the AC power signals to the electrical machine. The noise may couple to sensors for the electrical machine and cause noise in the sensor output signals. The sensor output signals may provide feedback for a closed loop control system for the electrical machine and noise may impact the closed loop operation. Also, the noise in the feedback signals may cause electromagnetic compatibility (EMC) issues, either by direct radiated emissions or by coupling to other circuits in the vehicle wiring harness as the feedback signals travel from the electrical machine. The techniques of this disclosure may include filter circuitry located near or inside the electrical machine that filters out the unwanted noise in the feedback signals.

A deroll control system includes an outer housing, a detector configured to capture an image, an annular torsional flexure, at least one drive and a controller configured to control the at least one drive. The annular torsional flexure has a rotatable inner mount surface to which the detector is mounted, a fixed outer mount surface fixed to the outer housing and spaced radially apart from the rotatable inner mount surface, and a flexure region having a plurality of flexures spaced radially between the inner mount surface and the outer mount surface. The at least one drive is coupled to the inner mount surface of the torsional flexure and is configured to cause a counter-rotation of the inner mount surface and the detector about a central rotational axis perpendicular to an image plane to correct a rotation of the image as the detector is capturing the image.

A deroll control system includes an outer housing, a detector configured to capture an image, an annular torsional flexure, at least one drive and a controller configured to control the at least one drive. The annular torsional flexure has a rotatable inner mount surface to which the detector is mounted, a fixed outer mount surface fixed to the outer housing and spaced radially apart from the rotatable inner mount surface, and a flexure region having a plurality of flexures spaced radially between the inner mount surface and the outer mount surface. The at least one drive is coupled to the inner mount surface of the torsional flexure and is configured to cause a counter-rotation of the inner mount surface and the detector about a central rotational axis perpendicular to an image plane to correct a rotation of the image as the detector is capturing the image.

An in-wheel electric motor includes at a vehicle side a connector stub, a stator body connected to the connector stub and on an outer surface equipped with stator windings, and further includes a rotor body coaxially enclosing the stator and rotatable around a rotation axis. The electric motor further includes a power electronics device for powering the stator and a detector for an angular position of the rotor body relative to the stator. The connector stub is provided with a support for coupling to the power electronics device which is mounted on the support inside the hollow stator body. The detector includes an angular position sensor mounted inside the hollow stator body and coupled to the rotor body wherein the detector is mounted on the power electronics device coaxially with the rotation axis.

An in-wheel electric motor includes at a vehicle side a connector stub, a stator body connected to the connector stub and on an outer surface equipped with stator windings, and further includes a rotor body coaxially enclosing the stator and rotatable around a rotation axis. The electric motor further includes a power electronics device for powering the stator and a detector for an angular position of the rotor body relative to the stator. The connector stub is provided with a support for coupling to the power electronics device which is mounted on the support inside the hollow stator body. The detector includes an angular position sensor mounted inside the hollow stator body and coupled to the rotor body wherein the detector is mounted on the power electronics device coaxially with the rotation axis.

A drive device for a braking device of a motor vehicle. The drive device includes an electric machine that includes a housing and a rotor that is rotatably supported in the housing, and a rotor position sensor device that includes a circuit board with at least one sensor element that is associated with the rotor. The circuit board has a circular disk-shaped design and is situated coaxially with respect to a rotational axis of the rotor. The circuit board is fastened in or at the electric machine via at least one detent connection.

A drive device for a braking device of a motor vehicle. The drive device includes an electric machine that includes a housing and a rotor that is rotatably supported in the housing, and a rotor position sensor device that includes a circuit board with at least one sensor element that is associated with the rotor. The circuit board has a circular disk-shaped design and is situated coaxially with respect to a rotational axis of the rotor. The circuit board is fastened in or at the electric machine via at least one detent connection.

A method, system, and computer-readable medium related to control of mud motors in drilling systems, of which the method includes measuring an eccentricity of rotation of a rotor in a stator of a mud motor using a rotor-position sensor, determining a torque of the mud motor based in part on the eccentricity, and selecting a fluid flow rate, a pressure, or both of fluid delivered downhole, through the mud motor, based in part on the determined torque.

A method, system, and computer-readable medium related to control of mud motors in drilling systems, of which the method includes measuring an eccentricity of rotation of a rotor in a stator of a mud motor using a rotor-position sensor, determining a torque of the mud motor based in part on the eccentricity, and selecting a fluid flow rate, a pressure, or both of fluid delivered downhole, through the mud motor, based in part on the determined torque.