An electric machine with variable torque generation having a tunable Halbach array configuration. The electric machine includes a magnet assembly for generating a magnetic field. The magnet assembly includes a plurality of fixed magnets disposed in a ring arrangement so that fixed magnets having a north pole faced toward the rotor or stator are alternated with fixed magnets having a south pole faced toward the rotor or stator, a plurality of rotatable magnets disposed within a respective slot formed between two adjacent fixed magnets, a drive assembly for turning the rotatable magnets within the slots to vary the magnetic field generated by the magnet assembly in the rotor or stator, the drive assembly configured to turn the rotatable magnets between a first position wherein the magnetic field in the rotor or stator is augmented and a second position wherein the magnetic field in the rotor or stator is cancelled.

An apparatus includes a first electrode, a second electrode, and a third electrode having first and second opposing surfaces. The first opposing surface is adjacent the first electrode and separated from the first electrode by a first distance, and the second opposing surface is adjacent the second electrode and separated from the second electrode by a second distance. The third electrode is configured to move relative to the first and second electrodes. A capacitance sensing circuit is coupled to the first and second electrodes. The capacitive sensing circuit is configured to determine a capacitance using the first and second electrodes.

An apparatus includes a first electrode, a second electrode, and a third electrode having first and second opposing surfaces. The first opposing surface is adjacent the first electrode and separated from the first electrode by a first distance, and the second opposing surface is adjacent the second electrode and separated from the second electrode by a second distance. The third electrode is configured to move relative to the first and second electrodes. A capacitance sensing circuit is coupled to the first and second electrodes. The capacitive sensing circuit is configured to determine a capacitance using the first and second electrodes.

A hand-held impact tool includes a motor, a driving mechanism, a tool body, a main handle, a first detection part, a second detection part and a control part. The tool body is configured such that an auxiliary handle is removably attached thereto. The main handle is connected to the tool body. The first detection part is configured to detect selected one of a plurality of modes. The second detection part is configured to detect whether or not the auxiliary handle is attached to the tool body. The control part is configured to control operation of the impact tool based on detection results of the first detection part and the second detection part.

A hand-held impact tool includes a motor, a driving mechanism, a tool body, a main handle, a first detection part, a second detection part and a control part. The tool body is configured such that an auxiliary handle is removably attached thereto. The main handle is connected to the tool body. The first detection part is configured to detect selected one of a plurality of modes. The second detection part is configured to detect whether or not the auxiliary handle is attached to the tool body. The control part is configured to control operation of the impact tool based on detection results of the first detection part and the second detection part.

An electric motor includes a motor winding interconnection for operating an electrosurgical instrument with exactly one motor platform that is designed to operate the motor at a first operating voltage and a second operating voltage different from the first operating voltage. The motor platform includes a circuit, preferably a delta circuit or a star circuit, formed in each case by three phases with a respective phase coil. At least one phase coil is formed from N>1 interconnected individual coils. At the first operating voltage, the N individual coils of each phase coil are connected in parallel. At the second operating voltage, the N individual coils of each phase coil are connected in series. At least one short-circuiting mechanism per phase coil switches over between the first and second operating voltage.

A power tool including a housing, a motor housed in the housing, and a handle formed on the housing, the handle being provided with a speed regulating mechanism for adjusting the rotational speed of the motor. A speed limiting mechanism cooperates with the speed regulating mechanism. The speed limiting mechanism includes a first knob and a second knob disposed on two sides of the handle. The first knob and the second knob are interlocked with each other to be toggled to limit the motor to operate at a fixed rotational speed.

A power tool including a housing, a motor housed in the housing, and a handle formed on the housing, the handle being provided with a speed regulating mechanism for adjusting the rotational speed of the motor. A speed limiting mechanism cooperates with the speed regulating mechanism. The speed limiting mechanism includes a first knob and a second knob disposed on two sides of the handle. The first knob and the second knob are interlocked with each other to be toggled to limit the motor to operate at a fixed rotational speed.

An assembly (2) is described for the electrical connection of two components, in particular of a power electronics switch (58) to an electric motor (56) of a charging device (48), wherein a first component (24) has a first contact element (4) made from a conductive material and formed along a longitudinal axis (6) and designed with an outer surface (8) at least partially surrounding the longitudinal axis (6), and a second component (30) has a second contact element (14) made from a conductive material and is designed with a cavity (18) formed along the longitudinal axis (6), whose inner surface (20) corresponds to the outer surface (8) of the first contact element (4), wherein either the inner surface (20) of the second contact element (14) or the outer surface (8) of the first contact element (4) is provided with a profile (22) which has a plurality of projecting elements, wherein the inner surface (20) and the outer surface (8) are selected with respect to their lateral dimensions such that the projecting elements of the profile (22) penetrate in an area close to the surface during insertion of the first contact element (4) into the second contact element (14).

An assembly (2) is described for the electrical connection of two components, in particular of a power electronics switch (58) to an electric motor (56) of a charging device (48), wherein a first component (24) has a first contact element (4) made from a conductive material and formed along a longitudinal axis (6) and designed with an outer surface (8) at least partially surrounding the longitudinal axis (6), and a second component (30) has a second contact element (14) made from a conductive material and is designed with a cavity (18) formed along the longitudinal axis (6), whose inner surface (20) corresponds to the outer surface (8) of the first contact element (4), wherein either the inner surface (20) of the second contact element (14) or the outer surface (8) of the first contact element (4) is provided with a profile (22) which has a plurality of projecting elements, wherein the inner surface (20) and the outer surface (8) are selected with respect to their lateral dimensions such that the projecting elements of the profile (22) penetrate in an area close to the surface during insertion of the first contact element (4) into the second contact element (14).