The present disclosure relates to hub apparatuses and associated systems. An embodiment of the hub apparatus includes a rotor assembly, a shaft, and a stator assembly. The rotor assembly includes first/second housing components and multiple magnets mounted on one or both of the first and second housing components. The stator assembly includes (1) a coil assembly positioned corresponding to the magnets; (2) a main circuit board fixedly coupled to the coil assembly; and (3) a battery assembly positioned inside the coil assembly and carried by the main circuit board.

A washing machine appliance or drive assembly, as provided herein, may include an agitator drive shaft and a motor. The agitator drive shaft may extend along a drive axis from a first end to a second end defang a mounting portion about the drive axis. The motor may be operably connected to the agitator drive shaft to drive rotation thereof. The motor may include a rotor and a stator. The rotor may be fixed to the agitator drive shaft at the second end. The rotor may define a central aperture along the drive axis. The central aperture may define an interior profile complementary to the mounting portion of the agitator drive shaft. The stator may be rotationally fixed and positioned radially inward from the rotor.

A washing machine appliance or drive assembly, as provided herein, may include an agitator drive shaft and a motor. The agitator drive shaft may extend along a drive axis from a first end to a second end defang a mounting portion about the drive axis. The motor may be operably connected to the agitator drive shaft to drive rotation thereof. The motor may include a rotor and a stator. The rotor may be fixed to the agitator drive shaft at the second end. The rotor may define a central aperture along the drive axis. The central aperture may define an interior profile complementary to the mounting portion of the agitator drive shaft. The stator may be rotationally fixed and positioned radially inward from the rotor.

A nail drive device of electric nail gun includes a nailing rod and a rotary actuator that can output a specific rotation angle and can drive the nailing rod to move downward for nailing. Specifically, the rotary actuator includes a stator and a rotor surrounding it, between the stator and the rotor, even groups of electro-magnetic mutual action components are configured in pairs, to generate a tangential force to drive the rotor to rotate for a specific rotation angle, and to drive the nailing rod to move for a nailing stroke. The nailing stroke can be determined by the specific rotation angle. Thus, through the above configuration of the rotary actuator, the structure of the electric nail gun can be simplified.

A nail drive device of electric nail gun includes a nailing rod and a rotary actuator that can output a specific rotation angle and can drive the nailing rod to move downward for nailing. Specifically, the rotary actuator includes a stator and a rotor surrounding it, between the stator and the rotor, even groups of electro-magnetic mutual action components are configured in pairs, to generate a tangential force to drive the rotor to rotate for a specific rotation angle, and to drive the nailing rod to move for a nailing stroke. The nailing stroke can be determined by the specific rotation angle. Thus, through the above configuration of the rotary actuator, the structure of the electric nail gun can be simplified.

The invention relates to a linear drive unit comprising a first and second actuator element, a guiding unit configured to enable a linear relative movement between both actuator elements, a first and second power unit, each attached to the first actuator element and configured to provide the second actuator element with a respective first and second driving force, and a control unit for controlling both power units and configured to control the first and second driving force such that the first driving force can be different from the second driving force. The invention further relates to a telescope comprising a linear drive unit as well as to a method of aligning such telescope.

The invention relates to a linear drive unit comprising a first and second actuator element, a guiding unit configured to enable a linear relative movement between both actuator elements, a first and second power unit, each attached to the first actuator element and configured to provide the second actuator element with a respective first and second driving force, and a control unit for controlling both power units and configured to control the first and second driving force such that the first driving force can be different from the second driving force. The invention further relates to a telescope comprising a linear drive unit as well as to a method of aligning such telescope.

Aspects of the disclosure relate to electrically driven power end apparatus and methods, and associated components thereof. In one implementation, a power end for a pump includes a crankshaft coupled to a plurality of actuation rods, and a motor. The motor includes a rotor coupled to the crankshaft. The rotor includes a plurality of electrical coils wound at least partially around the rotor. The motor includes a stator disposed radially outside the rotor, and the stator includes one or more magnets. The plurality of electrical coils apply a magnetic force to the rotor to turn the crankshaft when the plurality of electrical coils are powered.

Aspects of the disclosure relate to electrically driven power end apparatus and methods, and associated components thereof. In one implementation, a power end for a pump includes a crankshaft coupled to a plurality of actuation rods, and a motor. The motor includes a rotor coupled to the crankshaft. The rotor includes a plurality of electrical coils wound at least partially around the rotor. The motor includes a stator disposed radially outside the rotor, and the stator includes one or more magnets. The plurality of electrical coils apply a magnetic force to the rotor to turn the crankshaft when the plurality of electrical coils are powered.

Motor dampening provisions are described. Incorporation and use of the motor dampener(s) in a rotary type drain cleaning machine enables elimination of a clutch in the machine. Also described are clutch-free drive systems using the motor dampener(s). Also described are torque countering members that are used in conjunction with the motor dampener(s).