An electronic device includes a first housing, a second housing slidably coupled to the first housing, a rollable display configured to be enlarged or reduced based on a movement of the second housing, a rack gear disposed on the second housing, a pinion gear driven in engagement with the rack gear and including a plurality of teeth, an actuator configured to rotate the pinion gear and coupled with the pinion gear by a shaft, a first magnet surrounding at least part of the shaft, and spaced apart from the pinion gear along the shaft, and a hall sensor spaced apart from the pinion gear in direction perpendicular to the shaft, and a processor, wherein the processor is configured to obtain data related to a change in the magnetic force using the hall sensor and identify a rotating angle of the pinion gear based on the data related to a change in the magnetic force.

An electrical submersible well pump assembly has a SAW (surface acoustic wave) sensor on a motor shaft. A SAW electronic circuit mounts to the motor housing. The SAW electronic circuit has an antenna closely spaced to the SAW sensor for monitoring torque on the motor shaft. A controller at an upper end of the well supplies power to the motor. A motor gauge unit mounted to a lower end of the motor transmits signals to the controller. A signal line extends from the SAW electronic circuit to the motor gauge unit for transmitting signals from the SAW electronic circuit to the motor gauge unit, and from the motor gauge unit to the controller.

An electrical submersible well pump assembly has a SAW (surface acoustic wave) sensor on a motor shaft. A SAW electronic circuit mounts to the motor housing. The SAW electronic circuit has an antenna closely spaced to the SAW sensor for monitoring torque on the motor shaft. A controller at an upper end of the well supplies power to the motor. A motor gauge unit mounted to a lower end of the motor transmits signals to the controller. A signal line extends from the SAW electronic circuit to the motor gauge unit for transmitting signals from the SAW electronic circuit to the motor gauge unit, and from the motor gauge unit to the controller.

According to one aspect of the present disclosure, an electric motor for a laundry appliance includes a first stator having a central axis. A first rotor is in electromagnetic communication with the first stator and is rotationally operable about the central axis. A second stator is aligned with the central axis. A second rotor is in electromagnetic communication with the second stator and is rotationally operable about the central axis. The first and second stators are positioned within a common motor cavity of an outer housing. A controller regulates a first electrical current to the first stator and a second electrical current to the second stator. The controller includes a torque discrimination module for monitoring an output torque of at least the first rotor.

A spindle shaft device including a shaft, a first torque sensor, and a second torque sensor. The shaft extends along an axial direction and comprises a first side portion, a second side portion, and a central portion located between the first side portion and the second side portion. The central portion has a central torsional rigidity with respect to the axial direction. The first side portion has a first torsional rigidity with respect to the axial direction. The second side portion has a second torsional rigidity with respect to the axial direction. The first torsional rigidity is smaller than the central torsional rigidity. The second torsional rigidity is smaller than the central torsional rigidity. The first torque sensor is disposed on the first side portion. The second torque sensor is disposed on the second side portion.

According to one aspect of the present disclosure, an electric motor for a laundry appliance includes a first stator having a central axis. A first rotor is in electromagnetic communication with the first stator and is rotationally operable about the central axis. A second stator is aligned with the central axis. A second rotor is in electromagnetic communication with the second stator and is rotationally operable about the central axis. The first and second stators are positioned within a common motor cavity of an outer housing. A controller regulates a first electrical current to the first stator and a second electrical current to the second stator. The controller includes a torque discrimination module for monitoring an output torque of at least the first rotor.

A power tool includes a motor including a rotor and a stator disposed around the rotor; an output shaft to which a tip tool is attached and that is rotated by power generated by the motor; a torque sensor unit that is disposed between the stator and the output shaft in a front-rear direction parallel to a rotation axis of the motor and that is coupled to the output shaft; an amplifier circuit that amplifies a detection signal of the torque sensor unit; and a housing including a motor housing part for housing the motor and a grip part. The torque sensor unit is disposed forward of the stator. The grip part is disposed downward of the motor housing part. The amplifier circuit is disposed upward of the grip part. The amplifier circuit is disposed forward of a rear end part of the stator.

A power tool includes a motor including a rotor and a stator disposed around the rotor; an output shaft to which a tip tool is attached and that is rotated by power generated by the motor; a torque sensor unit that is disposed between the stator and the output shaft in a front-rear direction parallel to a rotation axis of the motor and that is coupled to the output shaft; an amplifier circuit that amplifies a detection signal of the torque sensor unit; and a housing including a motor housing part for housing the motor and a grip part. The torque sensor unit is disposed forward of the stator. The grip part is disposed downward of the motor housing part. The amplifier circuit is disposed upward of the grip part. The amplifier circuit is disposed forward of a rear end part of the stator.

A yoke member includes a primary yoke and a secondary yoke which are opposed to each other. The primary yoke is configured such that a maximum width of a widest portion of each of a plurality of primary teeth of the primary yoke is smaller than a minimum width of a narrowest portion of a primary ring plate of the primary yoke. The secondary yoke is configured such that a maximum width of a widest portion of each of a plurality of secondary teeth of the secondary yoke is smaller than a minimum width of a narrowest portion of a secondary ring plate of the secondary yoke.

A yoke member includes a primary yoke and a secondary yoke which are opposed to each other. The primary yoke is configured such that a maximum width of a widest portion of each of a plurality of primary teeth of the primary yoke is smaller than a minimum width of a narrowest portion of a primary ring plate of the primary yoke. The secondary yoke is configured such that a maximum width of a widest portion of each of a plurality of secondary teeth of the secondary yoke is smaller than a minimum width of a narrowest portion of a secondary ring plate of the secondary yoke.