Abstract: The invention relates to a rear-projecting device including a light guide for distribution of light from a light source to a light projecting area, a spatial light modulating arrangement, the light modulating arrangement is arranged in relation to the light-projecting area such that the arrangement illuminates a sub-area of the light-projecting area, the light projection area is at least partly transparent.

Abstract: A retarded electric motor is disclosed which may be designed as a series motor or an asynchronous motor having a squirrel cage rotor. A valve means is provided for switching between motor operation and braking operation. During motor operation the motor is operated in a known configuration as series motor or as asynchronous motor. If configured as a series motor, the valve means (S1, S2, S3) allows to bypass the armature (12) and to operate the motor (10) as an externally excited direct current generator when switching into braking operation. If configured as an asynchronous motor, a switch is utilized to disconnect at least two field windings from mains. A valve means is utilized to excite the motor externally from mains with a pulsating direct current during braking.

Abstract: A series-wound motor is disclosed which is particularly suitable as a universal motor for an electric power tool. The motor comprises a stator with at least two field poles, each having two pole horns. At least one of the pole horns of each pole comprises first and second protrusions extending circumferentially from an axial edge of the pole horn. Sparking is reduced thereby. Also a retarded motor is disclosed, wherein each pole comprises a pole horn having a run-on edge, and further comprises a pole horn having a run-off edge. The pole horns having run-off edges are shortened in circumferential direction compared to the pole horns having run-on edges or comprise at least one cutout section extending in circumferential direction. The motor can be switched between a motor operation and a brake operation, without the need for providing commutating windings or additional coils to avoid excessive sparking.

Abstract: The invention relates to a rear-projecting device comprising: light guides (13) for distribution of light from at least one light source (30) to a light projecting area (10; 62) via at least one, preferably two spatial light modulating arrangements (41; 26), said light modulating arrangements (41; 26) being arranged in relation to a light-projecting area (10; 52) in such a manner that each of said arrangements (41; 26) illuminates a sub-area (10A; 38; 51; 61) of the said light-projecting area (10; 52), said light projection area (10; 52) being wholly or partly transparent. According to the invention, a compact and light efficient system has been obtained.

Abstract: A series-wound motor is disclosed which is particularly suitable as a universal motor for an electric power tool. The motor comprises a stator with at least two field poles, each having two pole horns. At least one of the pole horns of each pole comprises first and second protrusions extending circumferentially from an axial edge of the pole horn. Sparking is reduced thereby. Also a retarded motor is disclosed, wherein each pole comprises a pole horn having a run-on edge, and further comprises a pole horn having a run-off edge. The pole horns having run-off edges are shortened in circumferential direction compared to the pole horns having run-on edges or comprise at least one cutout section extending in circumferential direction. The motor can be switched between a motor operation and a brake operation, without the need for providing commutating windings or additional coils to avoid excessive sparking.

Abstract: A retarded series-wound motor is provided which is particularly suitable as a universal motor for an electric power tool. The motor comprises a stator with at least two field poles. Each pole comprises a pole horn having a run-on edge, and further comprises a pole horn having a run-off edge. The pole horns having run-off edges are shortened in circumferential direction compared to the pole horns having run-on edges or comprise at least one cutout section extending in circumferential direction. The motor can be switched between a motor operation and a brake operation, without the need for providing commutating windings or additional coils to avoid excessive sparking.

Abstract: A series motor with commutator is disclosed which is especially suited as universal motor for a braked power tool. The series motor comprises a switch for switching between a motor mode and a braking mode, wherein, in motor mode, at least one field winding is connected in series with an armature winding in a motor circuit, which is connected to an a.c. power source, and wherein, in braking mode, the at least one field winding and the armature winding form together a closed braking circuit disconnected from the power source. The secondary winding of a mains-operated transformer is connected within the braking circuit. This arrangement guarantees improved safety of the braking action.

Abstract: A series wound commutator motor is disclosed which is particularly suited for an inverse-speed electric tool. A switch is provided for switching between a motor operation mode and a braking operation mode, wherein in motor operation at least one field coil is connected in series with an armature winding in a motor circuit fed with a voltage supply and wherein in braking operation the at least one field coil with the armature winding forms a closed braking circuit separated from the voltage supply. A mains-supplied transformer is provided whose secondary winding is connected in the braking circuit parallel to the at least one field coil. A transistor circuit is provided for controlling the current flowing in the braking circuit through the armature winding and the at least one field coil.

Abstract: A series motor with a commutator and commutating winding, in particular for a braked power tool with a universal motor, is disclosed, having a stator which has a stator plate bundle that forms a closed yoke, having at least two field windings and at least one commutating winding, which is laid into grooves of the stator plate bundle. The stator plate bundle has, in the region of the axial ends of the at least one commutating winding, lateral grooves running transversely to the axial direction of the stator for receiving the ends of the at least one commutating winding, so that the commutating winding can be received flush in the stator plate bundle and thus the axial size of the stator can be shortened while output remains the same.