摘要:
A rotor of a dynamoelectric machine is provided, the rotor comprising a shaft, an essentially cylindrical armature, an armature coil comprising aluminum coil wires and a drum commutator, which comprises an insulating support body and conductor segments which are attached to said support body and fixed therein by means of armature sections. Said conductor segments each comprise a copper running surface area and a connection area made of aluminum or a metal which can be soldered with aluminum (aluminum-compatible metal) having a soldering tag which greatly projects over the brush running surface. Said coil wires are soldered to the end side to the soldering tag of the respectively associated conductor segments and to be precise, without directly contacting the areas of the running surface.
摘要:
An electrical machine with a brush commutator arrangement (1) is proposed. Brushes (3) and a commutator (5) are adapted and arranged such that, upon operating the electrical machine (1), the brush (3) and the commutator (5) are displaced relative to each other in a lateral displacement direction (7) and a contact surface (9) of the brush (3) mechanically contacts a contact surface (11) of the commutator (5) along an overlapping area (13) thereby generating an electrical contact. Accordingly, an electric current is transmitted between brush (3) and commutator (5) through the overlapping area (13). An orthogonal electrical conductivity of the brush (3) and/or the commutator (5) in a direction (25) orthogonal to a respective contact surface (9, 11) locally varies along the lateral displacement direction (7). An orthogonal electrical conductivity distribution in the brush (3) and/or the commutator (5) is adapted such that, even when operating the electrical machine at maximum allowable power, for at least 90% of all spatial configurations during displacing the brush (3) and the commutator (5) relative to each other, an electrical current density through the overlapping area (13) does not exceed 130% of a rated maximal average electrical current density through the brush commutator arrangement (1). Due to the specific variation of orthogonal electrical conductivity within the brush (3) or commutator (5), sparking and resulting wear in the proposed brush commutator arrangement (1) may be reduced.
摘要:
The invention relates to a disc commutator and a drum commutator for an electric motor having at least two commutator plates, each having a sliding-surface segment for contacting a carbon brush, said sliding-surface segments being electrically separated from one another. In the disc commutator, the electrical separation extends between the sliding-surface segments towards a commutator diameter inclined at an angle α In the drum commutator, the electrical separation of the sliding-surface segments is inclined in the longitudinal direction of the drum commutator and forms an angle β with a projection of the rotational axis of the drum commutator on the casing surface of the drum commutator.
摘要:
The earth's magnetic field has not been mined as a source of energy for electric vehicles. With average field strength of 0.5 Tesla around the world it is easy to understand why it has been overlooked. A disruptive technology is needed to mine the earth's magnetic field for powering electric vehicles. Such a technology, graphene, is now at an early stage of development with excellent properties in the form of high conductivity, low resistivity sheets that are durable, light weight, and low cost. Electrical properties of multiple sheets of graphene provide a significant multiplier to earth's weak magnetic field yielding a feasible source of ecologically clean power for electric vehicles. Graphene based EcoCharge systems can be mounted on a vehicles drive shaft and axles putting graphene in motion to mine the earth's magnetic field. Estimates show that EcoCharge can generate 15.1 kW at 60 mph while weighing only 10 oz.
摘要:
A commutator includes a substantially tubular insulating core, a first slip ring fixed to the core, a plurality of first bars electrically connected to the first slip ring, a second slip ring fixed to the core, and a plurality of second bars electrically connected to the second slip ring. The first bars and the second bars are fixed to the outer surface of the core and are alternately arranged at equally spaced intervals in the circumferential direction of the core. The first slip ring and the second slip ring are arranged on the same side of the first bars and the second bars. The first and second slip rings respectively comprise a contact surface that is substantially perpendicular to the axis of the commutator and is configured for contacting brushes.
摘要:
A commutator is formed by providing an electrically insulating commutator body. First and second areas are defined on the commutator body covering a brush contact surface in an alternating manner. At least the surfaces of the first areas are formed of laser direct structured material. The first areas are treated by a laser to form metal particle layers. Conductive layers are formed on the metal particle layers by a plating process to form commutator segments. Terminals are connected to the conductive layers for connecting the commutator to rotor windings.
摘要:
A brush direct current motor has a stator with a plurality of coils that correspond to a number of stator windings, a rotor with a number of poles, and a commutator. The commutator is connected to a first terminal of a direct current power source to convert the power into N phase alternating current. One end of each stator winding is connected to a respective phase of the alternating current via a brush and the other ends of the stator windings are connected to the second terminal of the direct current power source.
摘要:
The invention relates to a commutator (1) comprising electrically conductive commutator segments (12), which are disposed about a rotational axis (10) in a manner free of a pressing material body, and which are electrically insulated from each other by means of an air gap (14) disposed between two adjacent commutator segments (12), characterized in that a fixing means (42) applied to the commutator (1) in a flowable phase in a form-free manner is cured after a flow process between two commutator segments (12) adjoining in the circumferential direction about the rotational axis (10), and that the position of the commutator segments (12) is fixed by the cured fixing means (42), and to a power tool having an electric motor comprising such a commutator, and to a method for the production of a commutator.
摘要:
A method of manufacturing a commutator main body which has a cylindrical insulating body, and a plurality of segments arranged in an outer circumference of the insulating body. A short-circuit member is arranged in an end in an axial direction of the insulating body. The short-circuit member has a plurality of first short-circuit pieces and a plurality of second short-circuit pieces. A tabular insulating portion covers first coupling portions of the first short-circuit pieces, and second coupling portions of the second short-circuit pieces. The insulating portion has a restriction recess, and the end in the axial direction has a restriction projection. The restriction projection is engaged with the restriction recess, whereby the movement of the short-circuit member in the circumferential direction with respect to the commutator main body is restricted. Accordingly, the assembly of the short-circuit member in the commutator main body is facilitated.
摘要:
A commutator is provided which can be produced at low cost and is excellent in wear resistance and can be used in the fuel pump. The commutator is one in which at least those portions which come into contact with brushes comprise a filler mainly consisting of coke, and a carbonized binder.