A vacuum cleaner includes a suction inlet, a motor, and an impeller connected to the motor and operable to generate suction through the suction inlet upon operation of the motor. The vacuum cleaner further includes a power connector mounted to the vacuum cleaner and selectively connectable to a direct current (DC) power source and an alternating current (AC) power source. The power connector includes external terminals accessible from an exterior of the vacuum cleaner. The external terminals are configured for removable mechanical connection to each of the DC power source and an AC power supply cord such that the DC power source and the AC power supply cord are selectively and mechanically connectable to the same external power connector terminals.

A vacuum cleaner includes a suction inlet, a motor, and an impeller connected to the motor and operable to generate suction through the suction inlet upon operation of the motor. The vacuum cleaner further includes a power connector mounted to the vacuum cleaner and selectively connectable to a direct current (DC) power source and an alternating current (AC) power source. The power connector includes external terminals accessible from an exterior of the vacuum cleaner. The external terminals are configured for removable mechanical connection to each of the DC power source and an AC power supply cord such that the DC power source and the AC power supply cord are selectively and mechanically connectable to the same external power connector terminals.

The disclosure relates to a brake device for an electric motor, which has at least one armature winding and at least one field winding, comprising at least one open-loop and/or closed-loop control unit at least for open-loop control and/or closed-loop control of at least one electric current through the armature winding and/or through the field winding. According to the disclosure, in the event of short-circuit braking of the electric motor, the open-loop and/or control-loop unit is intended to reduce, at least temporarily, an electric armature current flowing through the armature winding.

A machine tool device for a portable machine tool in one embodiments includes at least one coupling unit which couples a machining tool and at least one drive unit configured to drive the coupling unit. The machine tool device includes a recuperation unit which provides, in at least one deactivated state of the drive unit, electrical energy which supplies at least one functional unit from a kinetic energy of at least the coupling unit.

A machine tool device for a portable machine tool in one embodiments includes at least one coupling unit which couples a machining tool and at least one drive unit configured to drive the coupling unit. The machine tool device includes a recuperation unit which provides, in at least one deactivated state of the drive unit, electrical energy which supplies at least one functional unit from a kinetic energy of at least the coupling unit.

A multi-axis servo control system includes a plurality of motors and a plurality of drive control apparatuses. The drive control apparatuses are connected to each other through an external field bus. Each drive control apparatus includes a control unit and a plurality of drive units. The drive units are connected to the control unit in series by a plurality of local buses to form a series-connected communication loop of sequentially transmitting data. Each drive unit controls at least one of the motors. The control unit receives multi-axis position commands through the external field bus, and the drive units correspondingly receive multi-axis commands through the local buses so as to control the motors in a decentralization manner.

The present disclosure is directed to a convertible battery pack having an improved switching circuit. The switching circuit includes a converter element having a plurality of contacts positioned in the converter element such that as the converter element slides within the battery pack the contacts move from a first position to engage a first set of contact pads to a second position to engage a second set of contact pads. The converter element includes a pair of springs for each of the plurality of contacts that force the contacts into engagement with the contact pads but also allow the contacts to adjust for imperfections in the contact pad surface or the manufacturing tolerances of the contact pads or a support board that holds the contact pads.

An electric working machine comprises a motor, a switch, a drive device, a brake device, and a failure determiner. The switch is configured for operation by a user, has an on-state and an off-state. The drive device is configured to drive the motor in response to the switch being placed in the on-state. The brake device is configured to control deceleration of the motor to a stopped state in response to the switch being placed in the off-state. The failure determiner is configured to monitor deceleration of the motor during controlled deceleration and to determine whether the brake device has failed based on the monitored deceleration.

A switching device includes a base module equipped with an electromagnetic drive that has a yoke, a coil and an armature arranged movably relative to the yoke, and that has a switching contact that includes a stationary switching piece and a movable switching piece arranged opposite the stationary switching piece, wherein the switching contact is switchable between an “open” position and a “closed” position via movement of the armature, where the switching device also includes a modular auxiliary switching unit equipped with a contact system that consists of a stationary switching piece and a movable switching piece arranged opposite the stationary switching piece such that the coupling between the base module and the modular auxiliary switching unit is configured such that different distances in the contact system of the auxiliary switching unit are transferrable during a trigger event via an elastic element regardless of the auxiliary switching unit in use.

A switching device includes a base module equipped with an electromagnetic drive that has a yoke, a coil and an armature arranged movably relative to the yoke, and that has a switching contact that includes a stationary switching piece and a movable switching piece arranged opposite the stationary switching piece, wherein the switching contact is switchable between an “open” position and a “closed” position via movement of the armature, where the switching device also includes a modular auxiliary switching unit equipped with a contact system that consists of a stationary switching piece and a movable switching piece arranged opposite the stationary switching piece such that the coupling between the base module and the modular auxiliary switching unit is configured such that different distances in the contact system of the auxiliary switching unit are transferrable during a trigger event via an elastic element regardless of the auxiliary switching unit in use.