Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/14—Means for supporting or protecting brushes or brush holders
  • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
  • H02K5/148—Slidably supported brushes
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/08—Structural association with bearings
  • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor

Definitions

• the invention relates to a DC motor, in particular electric motor for driving pumps for slip-controlled brake systems, essentially comprising a fixed part, in particular stator, comprising a motor housing comprising a cylindrical wall portion for receiving permanent magnets, and having a rotating part, in particular rotor, containing a shaft with an end piece for a winding support, as well as with a bearing between stator and rotor, and with electrical connection components such as in particular carbon brushes in an electrical connection between the rotor and an electrical load or an electrical power supply.
• Such electrical machines for motor vehicles are generally designed as a direct current machine and serve primarily the energy conversion in a motor vehicle, preferably for the conversion of electrical energy into hydraulic energy for the purpose of driving stability control or for driving hydraulic actuators.
• a motor pump unit is apparent with an axial length shortened electric motor.
• a topffömig designed motor housing is located with its pot bottom side to the outside moisture protected against the pump housing, a rotor shaft end protrudes through a central opening of the pot bottom side and A-side is mounted on a fixed in the interference fit rotor shaft bearing directly centered in a bearing receptacle of the pump housing to this, and the rotor shaft end via the A-side plugged rotor shaft bearing in the direction of the B-side of the rotor shaft axially supported against the pot bottom side of the motor housing.
• the known electric motor allows a compacted construction in the axial direction.
• the geometric design of an electric motor in particular the design of length and diameter, as a motor design size.
• the variables have an influence on the dimensioning of the engine torque.
• the dimensioning and in particular the minimization of a magnetic air gap is a very effective measure to change engine characteristics.
• the variation of other constructive geometric properties is convincing due to its particular unpretentiousness and cost-effective, simple reproduction within a mass production.
• diameter-different motors are produced, each with individually manufactured brush holder plates.
• this approach has the disadvantage that always an inappropriately large number of different sized engine components must be made and stored. This unduly increases the required logistical effort.
• the invention is therefore based on the object to enable a simplified and cost-effective production of electric motors of different power classes.
• a further object of the invention is to provide a DC motor of compacted construction which allows at least equal or increased power.
• FIG. 1 shows an electrical machine according to a first design comprising standard magnets with enlarged details X and Y,
• Fig. 2 shows an electrical machine according to a second design with reinforced magnets
• FIG 3 shows an electrical machine according to a third design with extended motor housing.
• the drawing illustrates a designed as an electric drive machine 1 which is designed in particular for use in conjunction with a motor pump unit.
• the machine 1 is flanged to a not further clarified receiving body 2, which has not further clarified pump components, electromagnetically actuated valves, memory, damper and channels for the hydraulic connection of said components.
• the rotational movement of a rotor 3 of the machine 1 is converted into a linearly oscillating movement of the pump piston by means of an eccentric 5 connected in a rotationally fixed manner to the shaft 4.
• the shaft 4 is standardized and has a thickened center piece 6 and two end pieces 7,8 which have a reduced diameter compared to the center piece 6.
• the end piece 7 is formed eccentrically and engages in a not clarified crankcase to pump piston drive.
• the eccentric geometry can be designed to vary depending on the performance.
• the end piece 8 merges with a generously bevelled or rounded transition 9 into the middle piece 6.
• the tail 8 carries a winding support 10 with windings and a so-called A-bearing, which is formed space neutral by the gradation of the shaft 4 as a ball bearing, and an inner ring 12 which is seated directly on the shaft 4, and an outer ring 13, which in a cupped everted portion 14 is received by a stepped pot-shaped motor housing 15.
• the middle piece 6 also carries a commutator 16, which is connected to electrical windings, and is acted upon by carbon brushes 17, which are arranged movably guided on a separate brush holder plate 18.
• the brush holder plate 18 is also designed as a bearing plate for a so-called B-bearing 19.
• the B-bearing 19 is designed as a ball bearing, the inner ring 20 is seated on the middle piece 6 of the shaft 4.
• An outer ring 21 is at least partially received by the brush holder plate 18.
• the standardized brush holder plate 18 is made substantially in one piece from plastic material and has an inner ring 22 and an outer ring 23, which are interconnected by an annular flat disc 24 so that the brush holder plate 18 forms a lid-like closure member, the motor interior 25 substantially complete separated from the flanged pump unit.
• the disk 25 is placed in the axial direction with the smallest possible air gap on the winding support 10.
• carbon brushes 17 are to be additionally arranged between the winding carrier 10 and the disk 24.
• the two rings 22,23 are so to the disc 24th connected, that they protrude substantially with their entire length at right angles to the radial main extension direction of the disc 24 and axially in the direction of the pump unit.
• a peripheral outer surface 26 of the outer ring 23 is tapered or convex outwardly rounded in the manner of a chamfer, so that the part of the outer ring 23 which is deeply inserted into the stepped motor housing 15 has a smaller outer diameter than a less deeply inserted part of the outer ring 23.
• the cutout 27 makes it possible to lower the rotor 3 particularly quickly into the motor housing 15 during assembly because it has a favorable influence on the air displacement.
• the outer ring 23 of the brush holder plate 18 has a, circumferentially stepped shoulder 28, pointing in the direction of the motor interior, which is suitable in the axial direction for seating on a step 29 of the motor housing 15. Due to the peripheral support between shoulder 28 and step 29 not only increased axial Dichtungsanpress concept allows, but at the same time allows an additional labyrinthine seal.
• the outer ring 23 is provided with a stepped, even radially outwardly open, recess 30 which receives a sealing element 31 such that this elastic, three-sided contact between the motor housing 15, (pump) receiving body 2 and brush holder plate 18 allows when the motor housing 15 is seated on the receiving body 2.
• the commutator 16 is at least partially aligned with the inner ring 22 and outer ring 23. Axially next to the commutator 16 and in front of the B-bearing 19, a so-called bulkhead 32 is provided, which extends substantially to a thickened emergency bearing 33, which can be effective at the same time as a gap or labyrinth seal, to the outer periphery of the shaft 4.
• Figures 1 and 2 illustrate the box-like design identical part strategy with component identity regarding shaft 4, bearings 11,19, motor housing 15, commutator 16 and brush holder plate 18.
• motor variation only dimensions or material of permanent magnets 34 and the diameter of the winding support 10 are varied. This can be done relatively easily, because the winding support is usually made of lamellar stamped sheet metal parts.
• neodymium magnets with the thickness t2, which allow an increased magnetic excitation.
• the invention also makes it possible to reduce the volume of a DC motor and to vary its performance in a simple manner.
• To change the electrical power of the DC motor is preferably a change in diameter of the rotor 3.
• the described tuning of the components it is possible in the sense of a modular system that a brush holder plate 18 is dimensioned in principle as a standard component, and at the same time acts as a bearing plate.
• a standardized brush holder plate 18 can therefore be provided for differently powerful dimensioned DC motors.
• the described design principle makes it possible to represent a wide variety of electric motor power classes without having to exert any significant influence on the basic mechanical design.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Motor Or Generator Frames (AREA)
• Dc Machiner (AREA)

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Citations (4)

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• 2007
  • 2007-10-13 DE DE102007049209.1A patent/DE102007049209B4/de active Active
• 2008
  • 2008-01-31 WO PCT/EP2008/051211 patent/WO2008095862A1/de active Application Filing
  • 2008-01-31 JP JP2009548664A patent/JP5372777B2/ja active Active

Patent Citations (4)

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