Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K9/00—Arrangements for cooling or ventilating
  • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
  • F04C11/008—Enclosed motor pump units
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
  • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
  • F04C15/008—Prime movers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
  • F04C15/0096—Heating; Cooling
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
  • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D13/00—Pumping installations or systems
  • F04D13/02—Units comprising pumps and their driving means
  • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
  • F04D13/0653—Units comprising pumps and their driving means the pump being electrically driven the motor being flooded
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/58—Cooling; Heating; Diminishing heat transfer
  • F04D29/5806—Cooling the drive system
• • 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
  • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
• • 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
  • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
  • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
  • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
  • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
  • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2240/00—Components
  • F04C2240/40—Electric motor

Definitions

• the invention relates to an electric motor for a pump, in particular a gear pump or a vane pump, according to the preamble of
• Patent claim 1 Furthermore, the invention relates to a pump with such an electric motor and a cooling method for an electric motor of a pump.
• An electric motor of the type mentioned is known for example from DE 603 11 177 T2.
• the electric motor is designed as a brushless electric motor and has a stator and a rotor, wherein the rotor comprises a rotor shaft which is rotatably mounted in a rotor bearing of a bearing cap.
• the rotor shaft is connected to a pump wheel, which promotes engine oil.
• the extracted engine oil is directed through the stator to a rear side of the electric motor. From the back of the electric motor, the engine oil is finally returned to the front, in particular to the pump, wherein the engine oil flows through the rotor of the electric motor.
• a second coolant path is provided, which is formed on a rear side of the electric motor and serves to cool a power electronics, which is electrically connected to the
• Electric motor is connectable.
• the structure of the previously known electric motor is relatively expensive. Due to the longitudinal axial flow of the electric motor with the coolant are on the Rear of the electric motor Coolant guides required to increase the size of the electric motor.
• the invention has the object to provide an electric motor for a pump having a structurally simple structure and a compact design. It is another object of the present invention to provide a pump with such an electric motor and a cooling method for an electric motor of a pump.
• the invention is based on the idea of a brushless electric motor for a pump, in particular a gear pump or
• Vane pump to provide a housing and a bearing cap, wherein in the housing, a stator and a rotor are arranged.
• the bearing cap closes the housing longitudinally.
• the rotor has a rotor shaft which extends through a cover-side rotor bearing and a central opening of the bearing cap.
• the bearing cap also has an inlet opening for a pumping medium, wherein the inlet opening opens in the region of the cover-side rotor bearing, so that the pumping medium can reach the housing via the cover-side rotor bearing.
• the rotor bearing for supplying the pumping medium into the electric motor. Additional inlet openings are thus avoided.
• the rotor bearing can for this purpose preferably be designed as an open bearing, in particular deck disc-free, bearings. It is also possible to provide channels in the rotor bearing which make it possible for the pumping medium to reach the interior of the electric motor. In any case, in the bearing cap a corresponding inlet opening is provided so that the pumping medium can get to the rotor bearing.
• Electric motor by a particularly simple structure. Since the pumping medium passes directly through the rotor bearing in the interior of the electric motor, also an elaborate design of coolant channels to the Electric motor around dispensable. The electric motor therefore has a compact size.
• the inlet opening is formed by an expansion of the central opening. This further contributes to the simplification of the structure of the electric motor.
• a rotor shaft and an edge of the central opening a
• Annular gap may be formed, which forms the inlet opening. That's how it works
• the passage opening may form a further inlet opening, which is provided adjacent to the inlet opening formed by the widening of the central opening.
• the bearing cap thus has two inlet openings, wherein an inlet opening through the annular gap between the rotor shaft and the central
• Opening is formed and the further opening is a passage opening which is spaced from the central opening or formed separately.
• the bearing cap has a single inlet opening, which is formed as a passage opening, wherein the passage opening is separated from the central opening.
• Inlet opening is used, in the region of the cover-side rotor bearing opens, so that the pumping medium can be performed directly to the cover-side rotor bearing.
• the inlet opening or passage opening is provided that the inlet opening or passage opening in the manufacture of the
• the bearing cap may also have an outlet passage extending
• the inlet for the pumping medium and the outlet for the pumping medium are arranged in the bearing cap. Additional inlet and / or outlet openings in the housing of the electric motor are thus unnecessary.
• the housing bottom can be formed without openings. This simplifies the production of the electric motor, since only in the bearing cap corresponding openings are provided. At the same time this contributes to a compact design of the electric motor. In particular, it is possible to dispense with additional coolant channels in the region of the housing bottom of the electric motor.
• the outlet channel may be connected to a suction port of the bearing cap.
• the suction port can generally be a recess in the bearing cap, via which the pumping medium is sucked by the pump.
• the suction port is preferably a curved recess in one
• the suction port has in particular a kidney-shaped or crescent-shaped contour.
• a negative pressure prevails due to the pumping movement, which can also act on the interior of the electric motor due to the arrangement of the outlet channel in the region of the suction porting.
• the negative pressure generated by the pump can be effectively used for sucking pumping medium from the electric motor.
• a return channel is preferably formed, which is fluidly connected to the outlet channel.
• the return channel can run through the stator or be formed between the stator, in particular a stator lamination, and the housing of the electric motor.
• the plurality of return passages may extend through the stator or between the stator and the housing of the electric motor. It is also possible that individual return channels in the stator and further return channels between the stator and the housing of a
• coolant can be in the form of the pumping medium over the
• Inlet opening and the rotor bearing are fed into the interior of the electric motor. Due to the pump pressure, the pumping medium through the inlet opening and pressed the rotor bearing into the electric motor. The pumping medium flows as a coolant between the rotor and the stator of the electric motor in the direction of the housing bottom. Thus, the housing bottom of the electric motor is cooled.
• a power electronics which is preferably arranged on the housing bottom, can also be cooled by the pumping medium.
• the housing bottom is preferably used as
• the outlet channel is
• the at least one return channel may extend through an insulating member disposed between the stator and the bearing cap.
• the insulating member causes electrical insulation between the bearing cap and the housing of the electric motor and the stator.
• the insulating part can be designed so that it acts to assist in the compression of the stator within the housing of the electric motor.
• the insulating part may have a collecting ring channel, which passes through the
• the collecting ring channel is preferably fluidly connected to the at least one return channel.
• Collar ring be connected, so that sucked from the interior of the electric motor pumping medium can be collected in the collecting ring channel.
• the collecting ring channel is formed in the insulating part. It is also possible that the
• Collar ring channel is formed in the bearing cap. Furthermore, both the Isolation part, as well as the bearing cap together form a collecting ring channel. In general, the collecting ring channel can be molded in the bearing cap or in the insulating part or partially in the bearing cap and in the insulating part.
• Inlet channel which is connected to a pressure port of the bearing cap.
• the additional inlet channel can be formed by the passage opening, which is separated from the central opening and opens in the region of the rotor bearing.
• the intake port may be a pressure port of the
• the pressure port is preferably formed as a recess in a pump-side outer surface of the bearing cap. As well as the suction port, the pressure porting a
• the pressure port is preferably associated with the high pressure side of the pump. Due to the high pressure prevailing in the area of the pressure porting, the pumping medium is forced into the electric motor.
• the rotor shaft has an impeller.
• the impeller is preferably within the electric motor, in particular between the
• Bearing cap and a housing bottom arranged.
• the impeller between the stator and the bearing cap can be arranged. That about the
• Rotor bearing penetrating into the interior of the electric motor pumping medium can be distributed uniformly by the impeller within the electric motor. This ensures safe cooling in any mounting position of the electric motor.
• a pump in particular an oil pump, with a previously described electric motor
• the pump preferably has a pumping space which is at least partially bounded by the bearing cap of the electric motor.
• the bearing cap of the electric motor forms a pump bearing shield, so that an outer surface of the bearing cap substantially forms an inner surface of a pumping space.
• the inlet opening and / or the inlet channel connects the pump space to an interior of the housing. In this case, the inlet opening and / or the
• Inlet duct may be formed by a passage opening which is formed spaced from a central opening in the bearing cap. It can also be provided in the pump that the outlet opening in the bearing cap connects the at least one return channel with the pump chamber.
• An independent aspect of the invention relates to a method for cooling an electric motor of a pump, in particular a pump described above, wherein pumping medium flowing through a pump chamber of the pump at least partially by a cover-side rotor bearing of the electric motor in an interior of the electric motor and between a rotor and a stator of the Electric motor is passed to a housing bottom of a housing of the electric motor. Via return channels, the pumping medium is returned to the pump chamber, wherein the return channels extend through the stator or along the stator from the housing bottom to the bearing cap.
• the pumping medium is oil and a portion of the oil as leakage oil for cooling flows through the electric motor.
• the leakage oil not only the cooling of the electric motor, but also the cooling of a
• the electric motor has a power electronics, which by the in
• Power electronics is preferably connected to the housing bottom of the housing of the electric motor, in particular thermally coupled.
• the power electronics can be mounted on an outside of the housing bottom.
• the housing bottom thus serves as a heat transfer medium for transmitting the heat of the power electronics to the pumping medium circulating within the electric motor.
• the cover-side rotor bearing and / or a bottom-side rotor bearing can be lubricated by the circulating in the interior of the housing pumping medium.
• the leakage oil which is used as a coolant, additionally cause lubrication of the bearings of the electric motor.
• the rotor bearings can be provided with an oil lubrication.
• the cooling method according to the invention fulfills a dual function, namely on the one hand, the cooling of the electric motor and on the other hand, the lubrication of the rotor bearings of the
• the electric motor This significantly simplifies the construction of the electric motor.
• Fig. 1 a longitudinal sectional view of an inventive
• Fig. 2 is a longitudinal sectional view of an inventive
• Fig. 3 a longitudinal sectional view of an inventive
• Electric motor is provided;
• Fig. 4 is a cross-sectional view of an electric motor according to a preferred embodiment with
• Fig. 5 a cross-sectional view through a
• FIG. 6 shows a longitudinal sectional view through a bearing cap of an electric motor according to the invention after a preferred embodiment, wherein a
• Fig. 7 is a longitudinal sectional view of an inventive
• Embodiment wherein the rotor shaft is rotatably supported by a cover-side and a pump-internal rotor bearing.
• a brushless electric motor 1 is shown in longitudinal section, wherein the electric motor has a stator 11 and a rotor 12.
• the stator 11 and the rotor 12 are arranged in a housing 10.
• the housing 10 has a housing bottom 10 a and a side wall 18.
• the side wall 18 is preferably cylindrical. Coaxial to
• the housing 10 further comprises a bearing cap 20, which is arranged substantially parallel to the housing bottom 10a and closes the housing 10 longitudinally axially.
• the bearing cap 20 simultaneously forms the boundary for a pump chamber 2, through which a pumping medium flows.
• the rotor shaft 12a extends through the bearing cap 20 and projects into the pump chamber 12.
• On the rotor shaft 12a may be arranged a pumping wheel.
• the pump wheel is rotatably connected to the rotor shaft 12a and rotates within the pump chamber. 2
• Bearing cover 20 has a central opening 21. At the here shown
• an annular gap 23 is formed between the rotor shaft 12a and the central opening 21.
• the annular gap 23 is open towards a cover-side rotor bearing 12b.
• the annular gap 23 thus forms an inlet opening 22, which opens in the region of the cover-side rotor bearing 12b.
• pumping medium in particular oil
• the cover-side rotor bearing 12b is preferably designed so that the pumping medium can flow through the cover-side rotor bearing 12 b.
• a fluid path from the pump chamber 2 into the interior 16 of the electric motor 1 is provided by the inlet opening 22 in the region of the cover-side rotor bearing 12b.
• cover-side rotor bearing 12b as a rolling bearing, in particular as an open ball bearing without
• Cover discs is formed.
• the rotor shaft 12a is also rotatably mounted at a bottom end in a rotor bearing 12c, in particular a bottom rotor bearing 12c.
• the bottom rotor bearing 12c is also designed as a rolling bearing, in particular as a ball bearing.
• bottom-side rotor bearing 12c is rotatably held in a bottom-side bearing receptacle 18 of the housing bottom 10a.
• the bottom-side rotor bearing 12c may also be provided a pump-internal rotor bearing. Such an embodiment will be explained later in connection with FIG. 7.
• an electronics compartment 3 adjoins the interior 16 of the housing 10 outside. In other words, it separates
• Housing bottom 10a the interior 16 of the housing 1 of an electronics compartment 3 of the electric motor 1.
• the electronics compartment 3 is preferably a
• Electric motor 1 is connected.
• the power electronics are preferably thermally coupled to the housing bottom 10a. Thus, by the pumping medium flowing through the interior 16 of the housing 10 also heat from the
• the housing bottom 10a serves as a heat transfer element between the power electronics and the
• the stator 11 is arranged with two longitudinal axial ends of the housing bottom 10 a on the one hand and the bearing cap 20 on the other hand spaced. As spacers serve in particular two insulating parts 13, each to the longitudinally axial ends of the stator 11 are arranged. In particular, one is
• Isolation part 13 between the stator 11 and the bearing cap 20 is arranged.
• Another insulating member 13 is disposed between the stator 11 and the housing bottom 10a.
• the insulating parts 13 are substantially annular and have a U-shaped cross-sectional contour.
• a leg of the U-shaped insulating member 13 covers the stator 11.
• Another leg of the U-shaped insulating member 13 extends parallel and spaced from the side wall 10b of the housing 10. The other leg prevents the coil wires from slipping in the direction of the rotor 12.
• the thighs runs
• Connecting flange of the insulating part 13 separates winding wires IIa of a laminated stator core IIb.
• the insulating member 13 not only has the function of a spacer between the stator 11 and the housing 10, but also serves to guide the coil wires and isolates them from the stator 11 and the housing 10th
• return channels 17 are formed in the stator 11 and along the stator 11 .
• the return channels 17 extend from the housing bottom 10a to the bearing cap 20.
• the housing bottom 10a however, the return channels 17 at a distance, so that along the housing bottom 10a flowing
• Return channels 17 preferably extend into the bearing cap 20 or through the bearing cap 20.
• the bearing cap 20 has an outlet channel 25, which is fluidly connected to the return channel 17.
• the outlet passage 25 extends through the bearing cap 20.
• the outlet passage 25 is spaced from the central opening 21.
• Outlet channel 25 is disposed on an outer edge of the bearing cap 20.
• bearing cover 20 on the one hand an inlet opening 22 is formed, which opens in the region of the cover-side rotor bearing 12b. Furthermore, an outlet channel 25 is formed in the bearing cap 20, which is fluidly connected to a return channel 17. The return channel 17 may extend through the stator 11 or may be formed between a stator 11 and the side wall 10b of the housing 10.
• the bearing cap 20 has a pressure port 26 and a suction port 27.
• the pressure port 26 and the suction port 27 are preferably provided as kidney-shaped or crescent-shaped recesses in the bearing cap 20.
• the pressure port 26 and the suction port 27 are facing the pump chamber 2.
• the outlet channel 25, which extends through the bearing cap 20, is connected by a connecting channel 29 with the Sauporting 27.
• the pressure prevailing in the pump chamber 2 in the region of the suction port 27 negative pressure can be efficiently used to suck via the connecting channel 29, the outlet channel 25 and the return channel 17 pumping medium from the interior 16 of the housing 10.
• FIG. 1 Provided embodiment of FIG. 1, that passes through the inlet opening 22, which is formed as an annular gap 23 of the central opening 21, pumping medium from the pump chamber 2 to the cover-side rotor bearing 12b.
• the pumping medium flows through the cover-side rotor bearing 12 b and is passed between the rotor 12 and the stator 11 to the housing bottom 10 a.
• the pumping medium absorbs heat energy from the electric motor 1 and the power electronics, which is arranged in the electronics compartment 3.
• the pumping medium is guided further into the return channels 17 and flows via the return channels 17 to the
• Outlet channel 25 in the bearing cap 20 From the output channel 25 from the pumping fluid flows through the connecting channel 29 to the suction port 27 and thus passes back into the pump chamber. 2
• a collecting ring channel 14 may additionally be arranged on the pump chamber side. Pumping medium can be collected from a plurality of return channels 17 via the collecting ring channel.
• FIG. 2 shows an electric motor 1, which essentially has the same basic construction as the electric motor 1 according to FIG. 1.
• the electric motor 1 according to FIG. 1.
• Electric motor 1 a rotor 12 and a stator 11, wherein the rotor 12 includes a rotor shaft 12a, which is rotatably mounted in rotor bearings 12b, 12c.
• the bottom rotor bearing 12c is designed as a sliding bearing.
• the bottom rotor bearing 12 c is disposed a bottom-side bearing seat 18, which is formed by a shape of the housing bottom 10 a.
• the cover side of the rotor 12 is rotatably mounted in a cover-side rotor bearing 12b, wherein the cover-side rotor bearing 12b is rotatably fixed in a cover-side bearing receptacle 28.
• the cover-side bearing receptacle 28 is formed on the bearing cap 20.
• the collecting ring channel 14 is arranged on a pump chamber side of the bearing cap 20, is provided in the embodiment of FIG. 2, the
• the lid-side insulating member 13 has a groove which in the leg of the
• Insulating member 13 is formed, which abuts against the side wall 10b.
• the collecting ring channel connects the return channels 17 with each other, so that pumping medium flowing through the return channels 17 can be transferred to the outlet channel 15 via the collecting ring channel 14.
• the pumping medium passes from the pumping space 2 via the inlet opening 22 or the central opening 21 into the cover-side rotor bearing 12b.
• the pumping medium flows through the cover-side rotor bearing 12b and is guided between the rotor 12 and the stator 11 to the housing bottom 10a.
• the pumping medium in particular oil, for lubricating the bottom-side rotor bearing 12c, which is formed in the embodiment of FIG. 2 as a sliding bearing. From the collecting ring channel 14 in the insulating part 13, the pumping medium flows through the outlet channel 25 into the connecting channel 29. The connecting channel 29 guides the pumping medium to the suction port 27, so that the Pump medium again enters the pump chamber 2.
• the electric motor 1 according to FIG. 3 likewise has a basic structure which essentially corresponds to the basic construction of the exemplary embodiments according to FIGS. 1 and 2 equivalent.
• the brushless electric motor 1 has a rotor 12 and a stator 11, which are arranged in a housing 10.
• the stator 11 is arranged longitudinally between insulation parts 13.
• the lid-side stator 11 is arranged longitudinally between insulation parts 13.
• Isolation part 13 is analogous to the embodiment of FIG. 2 a
• Collar ring channel 14 is formed.
• the rotor 12 is rotatably mounted in rotor bearings 12b, 12c, wherein the rotor bearings 12b, 12c analogous to the
• Embodiment of FIG. 2 are formed.
• a cover-side rotor bearing 12 b is provided, which is non-rotatably mounted in a cover-side bearing receptacle 28 of the bearing cap 20.
• the cover-side rotor bearing 12b is designed as a roller bearing, in particular as an open ball bearing.
• the bottom-side rotor bearing 12c is held in a bottom-side bearing receptacle 18 formed in the housing bottom 10a.
• the bottom-side rotor bearing 12c is designed as a plain bearing, which can be lubricated by the pumping medium.
• the rotor 12 carries an impeller 15.
• the impeller 15 is rotatably connected to the rotor shaft 12a. That's it
• Impeller 15 arranged longitudinally axially between the stator 11 and the bearing cap 20.
• the impeller 15 is arranged between the cover-side rotor bearing 12b and a rotor laminated core 12d.
• the inlet opening 22 is again formed by a widening of the central opening 21.
• the central opening 21 forms an annular gap 23.
• the annular gap 23 forms the inlet opening 22.
• the fluid flow through the electric motor 1 is substantially analogous to the embodiments of FIGS. 1 and 2. In particular, the flows
• the pumping medium is used to absorb heat energy of a power electronics, which is thermally coupled to the housing bottom 10a.
• the pumping medium which is preferably formed by leakage oil from an oil pump, for lubrication of
• the pumping medium is then passed from the housing bottom 10 a via the return channels 17 in the direction of the bearing cap 20.
• the guided over the return channels 17 pumping medium is collected in the collecting ring channel 14, which is formed in the cover-side insulating part 13. Via the outlet channel 25, the pumping medium leaves the collecting ring channel 14 and returns to the pumping space 2.
• FIGS. 4 and 5 show alternative configurations of the return channels 17.
• the electric motor 1 comprises a side wall 10b of the housing 10, in which the stator 11 is arranged.
• the stator 11 has a laminated stator core IIb which forms stator horns 11c. To the stator horns 11c are
• the return channels 17 are provided.
• the pumping medium thus passes from the housing bottom 10a back in the direction of the bearing cap 20.
• the return channels 17 may be formed between the stator 11 and the side wall 10b of the housing 10.
• the laminated stator core IIb has a plurality of, in particular three, channel-like cut-outs on the outer circumference, which are delimited by the side wall 10b.
• return channels 17 are formed, which have a substantially triangular cross-section. The punched holes on the outer circumference of the stator lamination I Ib can be punched out in the punching of the individual sheets of the stator lamination I Ib.
• the return channels 17 directly in the stator 11, in particular in the laminated stator core IIb.
• FIG. 5 Such a variant is shown in FIG. 5.
• the return channels 17 are arranged in the region of the stator horns 11.
• Fig. 6 shows a further embodiment of an electric motor 1, wherein substantially the bearing cap 20 is shown. Generally is at the
• Embodiment according to FIG. 6 provided that the electric motor 1 is formed according to one of the embodiments of Figures 1 to 3. Only the bearing cap 20 is changed in the embodiment of FIG. 6.
• the bearing cap 20 has an additional inlet channel 24.
• the inlet channel 24 is formed as a passage opening in the bearing cap 20.
• the inlet channel 24 is provided separately from the inlet opening 22, in particular separately from the central opening 21.
• the inlet channel 24 is located in particular on a radius of the bearing cap 20, which is arranged between the central opening 21 and the outlet channel 25.
• the inlet channel 24 opens directly into the interior 16 of the housing 10.
• the inlet channel 24 is connected to a pressure port 26 of the housing
• Bearing cap 20 connected. Via the inlet channel 24, therefore, pump medium, in particular oil, can pass directly into the housing 10 of the electric motor 1, bypassing the cover-side rotor bearing 12b.
• pump medium in particular oil
• Such a design of the bearing cap 20 is provided in particular when a leakage oil from the pump is insufficient to cool the electric motor 1 and / or to lubricate rotor bearings 12b, 12c arranged therein.
• the inner space 16 of the housing 10 towards the collecting ring channel 14 is formed.
• the collecting ring channel 14 is thus generally provided that this can be formed either in the cover-side insulating part 13 or in the bearing cap 20.
• the collecting ring channel 14 is formed by two sub-channels, wherein a first sub-channel in the cover-side insulating part 13 and a second sub-channel in the bearing cap 20 is formed. If the collecting ring channel 14 is completely formed in the bearing cap 20, the collecting ring channel can be formed either on a side facing the inner space 16 of the housing 10 of the bearing cap 20 or on the pump chamber 2 side facing the bearing cap 20.
• the collection ring channel 14 can easily miteingeformt in the bearing cap 20 with the casting of the bearing cap 20. In other words, the
• Mold for the bearing cap 20 have a corresponding annular elevation to form the collecting ring channel 14 directly during casting in the bearing cap 20.
• the insulating part 13 is preferably a plastic injection molded part. In this respect, it can be provided, the collecting ring channel 14, when in the
• Insulating member 13 is formed directly in the Kunststoffsp scribe the insulating part 13 tileen.
• the formation of the collecting ring channel 14 can thus easily be integrated into the production process in all variants described here.
• FIG. 7 shows an electric motor 1 whose construction is substantially similar to the structure of the electric motor 1 according to FIG. 2.
• the embodiment of FIG. 7 differs from this by eliminating the bottom rotor bearing 12c.
• a pump-internal rotor bearing is provided within the pump chamber 2.
• the pump-internal rotor bearing can be a sliding bearing.
• the rotor shaft 12a is in this embodiment on the one hand by the cover-side rotor bearing 12b and on the other hand by the
• Rotor bearing 12b an inlet channel 24 extends.
• the inlet channel 24 begins at the central opening 21 or the inlet opening 22 and bypasses the cover-side rotor bearing 12b.
• the inlet channel 24 forms so far a bypass for oil from the pump chamber 2.
• the oil guide thus vermos past the rotor bearing.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Motor Or Generator Cooling System (AREA)
• Details And Applications Of Rotary Liquid Pumps (AREA)
• Motor Or Generator Frames (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

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• 2016
  • 2016-01-14 DE DE102016100535.5A patent/DE102016100535B4/de active Active
  • 2016-11-09 JP JP2018531346A patent/JP6725666B2/ja active Active
  • 2016-11-09 KR KR1020187019713A patent/KR102087204B1/ko active IP Right Grant
  • 2016-11-09 WO PCT/DE2016/200509 patent/WO2017101922A1/de active Application Filing
  • 2016-11-09 CN CN201680075518.9A patent/CN108475958B/zh active Active

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