Provided is a commutator of a motor including a body and hooks forming coil-receiving spaces between the body and inner surfaces of the hooks, wherein the hooks include recesses concavely formed on the inner surfaces of the hooks, and coils are seated on the recesses. Thus the present disclosure provides an advantageous effect of increasing fixing force of the hooks.

Provided is a commutator of a motor including a body and hooks forming coil-receiving spaces between the body and inner surfaces of the hooks, wherein the hooks include recesses concavely formed on the inner surfaces of the hooks, and coils are seated on the recesses. Thus the present disclosure provides an advantageous effect of increasing fixing force of the hooks.

A brush-commutated direct-current motor comprises a stator with a plurality of exciter poles, a rotor with a plurality of pole teeth, which is rotatable relative to the stator about an axis of rotation, grooves arranged between the pole teeth, and coil windings arranged on the pole teeth and a commutator which is arranged on the rotor and a plurality of lamellae to which the coil windings are connected. For manufacturing such direct-current motor the coil windings are arranged on the pole teeth in winding cycles, in each of which a coil winding is wound onto each pole tooth. It is provided that on each pole tooth a first coil winding wound around the pole tooth in a first winding direction and a second coil winding wound around the pole tooth in a second winding direction opposite to the first winding direction are arranged.

A brush-commutated direct-current motor comprises a stator with a plurality of exciter poles, a rotor with a plurality of pole teeth, which is rotatable relative to the stator about an axis of rotation, grooves arranged between the pole teeth, and coil windings arranged on the pole teeth and a commutator which is arranged on the rotor and a plurality of lamellae to which the coil windings are connected. For manufacturing such direct-current motor the coil windings are arranged on the pole teeth in winding cycles, in each of which a coil winding is wound onto each pole tooth. It is provided that on each pole tooth a first coil winding wound around the pole tooth in a first winding direction and a second coil winding wound around the pole tooth in a second winding direction opposite to the first winding direction are arranged.

The invention relates to a commutator, comprising an insulating base and a plurality of commutator segments arranged on the insulating base, wherein each commutator segment comprises a metal layer, a transition layer and a graphite layer arranged on the base in sequence. The transition layer contains a material identical to that of the graphite layer and a material identical to that of the metal layer. The invention further relates to a motor comprising the commutator and a method for manufacturing the commutator. As the transition layer contains the material identical to that of the graphite layer and the metal layer, the problem that the graphite layer and the metal layer are cracked during high temperature sintering is resolved. The service life of the commutator is prolonged. The method for manufacturing the commutator reduces chemical contamination and production cost caused by electroplating and brazing used in a traditional technology.

Connection terminal (10) according to the present invention includes a tab part and not smaller than four pinching plates (12) that hold an aluminum electric wire. Pinching plates (12) each include first slit (13) and contact surfaces (14). First slit (13) has a first open end located in one side of the slit, and a first tip located in the other side. The aluminum electric wire is inserted into first slit (13). Contact surfaces (14) are in contact with the aluminum electric wire that is press-fitted into first slit (13). A contact area in which contact surfaces (14) are in contact with a core wire is an area of 100% to 200% of a radial cross-sectional area of the core wire.

The invention relates to an electric motor (2) comprising a switching unit (8) having a number of contact wires (24) arranged in relation to a connection ring (22) for coil ends of a stator winding, and comprising an annular frame part (28) having a number of sockets (30) into each of which an insulation-displacement contact (14) with an insulation-displacement slot (52) can be inserted or is inserted, between two insulation-displacement limbs (54) for making terminal contact with at least one w ire end (26) of the contact wires (24), said sockets (30) each comprising a socket slot (38), on opposing socket walls (36), which is flush with the insulation-displacement slot (52) of the insulation-displacement contact (14) plugged into said socket (30), and the two socket walls (36) of each socket (30) each have a first clamping contour (42) protruding into the socket slot (38), for each wire end (26) received in the socket slot (38).

The invention relates to a discharge device (10) for discharging electro-static charges from a shaft (39), comprising an annular holder (11) and a conductor arrangement (12), said conductor arrangement comprising at least one flexurally elastic conductor (13) arranged on the holder, said conductor being made of a carbon fiber arrangement, each end of the conductor being accommodated in the holder, said conductor arrangement comprising at least two conductor portions (33) extending transversely to a longitudinal shaft axis (32), said conductor portions each comprising a shaft contact portion (34) which together form a contact arrangement for being contacted with two circumferential contact areas of a shaft circumference (35), which are arranged in a shaft contact plane W, in such a manner that the shaft contact portions are arranged tangentially to the shaft circumference upon contact to the shaft circumference.

The invention relates to an electric motor (2) comprising a switching unit (8) having a number of contact wires (24) arranged in relation to a connection ring (22) for coil ends of a stator winding, and comprising an annular frame part (28) having a number of sockets (30) into each of which an insulation-displacement contact (14) with an insulation-displacement slot (52) can be inserted or is inserted, between two insulation-displacement limbs (54) for making terminal contact with at least one w ire end (26) of the contact wires (24), said sockets (30) each comprising a socket slot (38), on opposing socket walls (36), which is flush with the insulation-displacement slot (52) of the insulation-displacement contact (14) plugged into said socket (30), and the two socket walls (36) of each socket (30) each have a first clamping contour (42) protruding into the socket slot (38), for each wire end (26) received in the socket slot (38).

A terminal connection structure of a motor casing configured to house an AC motor of a plurality of phases, the terminal connection structure includes a plurality of terminal blocks located side by side to each other along a circumferential direction of the motor casing and including a plurality of terminal surfaces facing away from the motor casing, and a plurality of terminals that penetrate the terminal blocks and are configured to be electrically connected to the phases of the AC motor. A portion of each of the terminals is located on the terminal surfaces. At least one terminal surface is offset in a perpendicular direction from a plane aligned with another terminal surface of the plurality of terminal surfaces.