US20080019065A1 - Drive device for a household appliance and method for mounting an electric motor - Google Patents
Drive device for a household appliance and method for mounting an electric motor Download PDFInfo
- Publication number
- US20080019065A1 US20080019065A1 US11/903,833 US90383307A US2008019065A1 US 20080019065 A1 US20080019065 A1 US 20080019065A1 US 90383307 A US90383307 A US 90383307A US 2008019065 A1 US2008019065 A1 US 2008019065A1
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- Prior art keywords
- arm
- insulator
- electric motor
- bearing plate
- threaded fastener
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
- D06F37/206—Mounting of motor
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
- D06F58/04—Details
- D06F58/08—Driving arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding
- H01R13/6485—Electrostatic discharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/40—Structural association with grounding devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
Definitions
- the invention relates to a drive device for a household appliance with an electric motor and measures for fastening the electric motor and also to a method for mounting an electric motor in or on a household appliance.
- German Published, Non-Prosecuted Patent Application DE 199 37 229 A1 discloses the problem of so-called discharge currents, which occur in the case of a drive device for a washing machine with an electric motor.
- Discharge currents are caused by capacitive effects in the case of an electric motor with a converter drive or an electronically commutated DC motor, i.e., a frequency-converted electric motor, in particular, at high conversion frequencies, for example, at 16 to 20 kHz.
- Such high-frequency discharge currents may be problematical with regard to the electromagnetic compatibility.
- a drive device for a household appliance having an electric motor
- the drive device including a motor fastening device for fastening the electric motor to the appliance and an insulator disposed between the fastening device and the electric motor for electrically insulating the electric motor from the fastening device, the insulator having a defined resistance for discharging electrostatic charges from the electric motor.
- the invention allows discharge currents to be effectively suppressed in order to ensure the electromagnetic compatibility of the household appliance. Because, the electric motor is not completely electrically insulated, however, electrostatic charges can, nevertheless, be discharged through the defined resistance of the insulating material provided with a residual conductivity.
- the insulating material may be a conductive plastic or else a plastic that is not conductive itself with which conductive material is admixed.
- the conductive material is carbon and/or metal powder.
- the resistance of the insulator between the electric motor and the fastening device is between approximately 0.5 megaohms and approximately 2 megaohms.
- a defined resistance between the electric motor and its fastening of, preferably, one megaohm is realized as a result.
- Such a resistance leads to effective suppression of the discharge currents and at the same time allows efficient discharging of an electrostatic charge.
- the defined resistance between the electric motor and its fastening is, advantageously, fixed, on one hand, by the conductivity of the insulating material and, on the other hand, by a defined contact pressure of the insulating material between the electric motor and its fastening.
- the defined overall resistance is, then, obtained from the sum of the resistances of the insulating material and the electric motor/insulating material and insulating material/fastening transition resistances.
- the resistance of the insulating material is determined by its residual conductivity; the resistance of the transition resistances is determined by the defined contact pressure.
- a contact pressure device disposed between the electric motor and the fastening device for producing a defined contact pressure.
- the defined contact pressure is, advantageously, realized by a fastening screw.
- the fastening screw holds the electric motor, for example, on a one-arm bearing cross or directly on a housing of the household appliance, for example, the rear side of the laundry tub in the case of a washing machine. If the fastening screw is tightened with a defined torque, this results in a defined contact pressure, which, in turn, fixes the transition resistance.
- the fastening device has a first clearance for receiving a screw shank of a screw having a screw head with a seating surface and an insulating layer is disposed under the seating surface of the screw head.
- the screw has a screw shank and a screw head with a seating surface
- the fastening device has a first clearance for receiving the screw shank
- an insulating layer is disposed under the seating surface of the screw head.
- the invention also allows the fastening of the electric motor to be performed by only one fastening screw, it being possible, for example, for arresting pins to be provided for the additional rotational fixing of the electric motor.
- the arresting pins are, advantageously, formed from nonconductive material, that is, from material without residual conductivity, or are coated with a nonconductive material.
- the invention is also advantageous because it allows the electric motor to be mounted with only one fastening screw, which is tightened with a defined torque. This has considerable associated cost advantages, in particular, for mass production. Furthermore, this also has advantages for quality assurance.
- the fastening device has at least a second clearance for receiving the arresting pin.
- the fastening device has at least one projection for being received in a corresponding clearance and an insulating layer of an electrically nonconductive material is disposed between the at least one projection and the corresponding clearance.
- the invention is suitable both for a direct drive—for example, an electric motor directly driving the laundry drum—and for an indirect drive—for example, an electric motor which drives the shaft of a laundry drum or a gear mechanism or a V-belt, as disclosed for example by German Published, Non-Prosecuted Patent Application DE 199 11 139 A1, corresponding to U.S. Pat. No. 6,499,323 to Skrippek et al.
- the fastening device has a one-arm fastening for the electric motor.
- a drive device for a household appliance having an electric motor
- the drive device including a means for fastening the electric motor to the appliance, and a means for electrically insulating the electric motor from the fastening means disposed between the fastening means and the electric motor, the insulating means having a defined resistance for discharging electrostatic charges from the electric motor.
- a drive device including a motor fastening device for fastening the electric motor to the appliance, and an insulator disposed between the fastening device and the electric.
- motor for electrically insulating the electric motor from the fastening device, the insulator having a defined resistance for discharging electrostatic charges from the electric motor.
- the appliance is a washing machine, a laundry dryer, or a food processor.
- a method for mounting an electric motor at a household appliance with a fastening screw including the steps of disposing an insulator of a defined residual conductivity between the electric motor and the household appliance, and tightening a fastening screw with a defined torque to press the insulator between the electric motor and the household appliance with a defined contact pressure and to produce a defined transition resistance.
- a method for mounting an electric motor at a household appliance including the steps of disposing an insulator of a defined residual conductivity between the electric motor and the household appliance, mounting the electric motor at the household appliance with a fastening screw, and tightening a fastening screw with a defined torque to press the insulator between the electric motor and the household appliance with a defined contact pressure and to produce a defined transition resistance.
- FIG. 1 is a lateral cross-sectional view of a drive device according to the invention
- FIG. 2 is an enlarged, fragmentary, plan view of the drive device of FIG. 1 ;
- FIG. 3 is a cross-sectional view of the drive device of FIG. 2 along section line III-III;
- FIG. 4 is a cross-sectional view of an alternative embodiment of the drive device of FIGS. 2 and 3 ;
- FIG. 5 is a cross-sectional view of another embodiment of the drive device of FIGS. 2 and 3 ;
- FIG. 6 is a cross-sectional view of a further alternative embodiment of the drive device of FIGS. 2 and 3 .
- FIG. 1 there is shown an electric motor 10 , which is connected by a fastening screw 12 to a one-arm bearing cross 14 .
- the electric motor 10 has a V-belt pulley 16 for receiving a non-illustrated V-belt, for instance, for driving the laundry drum of a washing machine, of a laundry dryer, or of a food processor.
- the drive device shown in FIG. 1 is a so-called indirect drive because between the electric motor 10 and the element to be driven there is a gear mechanism—in the example shown, a V-belt gear mechanism.
- the invention is not restricted to such a configuration; it can also be realized in the case of other drive configurations, in particular in the case of direct drives without a gear mechanism interposed.
- a direct drive for instance, the fastening screw 12 of the electric motor 10 would be fixed directly to a housing of the household appliance, or, for example, to the laundry tub.
- FIG. 2 shows a view of a detail of the drive device of FIG. 1 .
- the arresting pins 18 are of an electrically nonconductive plastic.
- insulating layers 22 which are, likewise, of an electrically nonconductive plastic.
- the insulating layers 22 may be formed as a structural unit with the arresting pin or pins 18 , which is advantageous when mounting the electric motor 10 .
- the one-arm bearing cross 14 has a bore for receiving the shank of the fastening screw 12 .
- the inner side of the bore is coated with an insulating layer 24 , which is of a material with a defined conductivity.
- the insulating layer 24 extends outside the bore in the one-arm bearing cross 14 to under the seating surface of the screw head of the fastening screw 12 so that the tightened fastening screw 12 is insulated from the one-arm bearing cross 14 by the insulating layer 24 .
- the fastening screw 12 engages in an internal thread 26 in the bearing plate 20 of the electric motor 10 so that a connection with good electrical conduction is established between the fastening screw 12 and the electric motor 10 .
- the fastening screw 12 is tightened with a defined torque so that a defined contact pressure is obtained in the region of the seating of the screw head of the fastening screw 12 on the insulating layer 24 .
- the defined contact pressure produces a defined transition resistance for the transitions between the one-arm bearing cross 14 and the insulating layer 24 , on one hand, and the insulating layer 24 and the fastening screw 12 , on the other hand.
- the transition resistances defined in this way, together with the defined conductance of the material of the insulating layer 24 produce a defined resultant resistance for the electrical connection between the bearing plate 20 of the electric motor 10 and the one-arm bearing cross 14 .
- the defined resistance is, advantageously, chosen in the range between 0.5 and 2 megaohms, preferably, 1 megaohm. Such a range ensures, on one hand, effective suppression of the undesired high-frequency discharge currents and, on the other hand, permits the desired discharging of electrostatic charge from the electric motor 10 through the one-arm bearing cross 14 .
- the fastening of the electric motor 10 by the one fastening screw 12 also has the advantage that, when the electric motor 10 is being mounted, only this one screw 12 has to be tightened with a defined torque to realize both the mechanical fixing of the electric motor 10 and the establishment of a defined resistance for discharging electrostatic charges from the electric motor. Because the tightening of the fastening screw 12 constitutes only one working step, this has advantages both with regard to production costs and also with regard to quality control.
- FIG. 4 shows an alternative embodiment of the invention, in which, in comparison with the embodiment of FIG. 2 , the arresting pins 18 respectively have projections for realizing the insulating layer 22 .
- the projections also serve as a mounting aid because they fix the depth of insertion of the arresting pins 18 into the corresponding bores in the bearing plate 20 .
- the material of the arresting pins 18 and of the insulating layer 22 is, in turn, electrically nonconductive so that the defined overall resistance—as in the case of the exemplary embodiment of FIG. 2 —is determined by the insulating layer 24 together with the defined contact pressure of the fastening screw 12 .
- FIG. 5 shows a further alternative exemplary embodiment, in which the insulating layer 24 is realized in the bearing plate 20 of the electric motor 10 and the thread 26 is realized in the one-arm bearing cross 14 .
- the bearing plate 20 has projections 28 , which engage in corresponding clearances in the one-arm bearing cross 14 .
- the insulating layer 22 of electrically nonconductive material so that the defined overall resistance is, in turn, fixed by the insulating layer 24 together with the defined contact pressure by the fastening screw 12 .
- FIG. 6 shows a further preferred exemplary embodiment of the invention, in which, in comparison with the exemplary embodiment of FIG. 5 , the insulating layer 24 is, in turn, formed in the one-arm bearing cross 14 and the thread 26 is formed into the bearing plate 20 of the electric motor 10 .
- the projections 28 are located on the bearing plate 20 of the electric motor 10 and engage in corresponding clearances in the one-arm bearing cross 14 , from which they are insulated by an insulating layer 22 of nonconductive material.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Food-Manufacturing Devices (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Lens Barrels (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
A drive device for a household appliance, in which an electromotor is fixed by a fixing screw. An insulation layer of a material with a defined conductivity is located between the fixing screw and the electromotor. The fixing screw is tightened with a defined torque such that, due to the resultant defined contact pressure, a defined resistance for discharging electrostatic charges from the electromotor is obtained. This simultaneously ensures the suppression of leakage currents. A method for mounting an electric motor is also disclosed.
Description
- This application is a continuation of copending International Application No. PCT/EP01/13448, filed Nov. 20, 2001, which designated the United States and was not published in English.
- The invention relates to a drive device for a household appliance with an electric motor and measures for fastening the electric motor and also to a method for mounting an electric motor in or on a household appliance.
- German Published, Non-Prosecuted Patent Application DE 199 37 229 A1 discloses the problem of so-called discharge currents, which occur in the case of a drive device for a washing machine with an electric motor. Discharge currents are caused by capacitive effects in the case of an electric motor with a converter drive or an electronically commutated DC motor, i.e., a frequency-converted electric motor, in particular, at high conversion frequencies, for example, at 16 to 20 kHz. Such high-frequency discharge currents may be problematical with regard to the electromagnetic compatibility. To prevent the discharge currents, it has, therefore, been proposed to produce the supporting body of the stator supporting part or the stator supporting part of the electric motor as a whole from electrically nonconductive plastic.
- One disadvantage of this is that such plastic stator supporting parts do not have great dimensional stability. A further disadvantage is that, on account of the complete insulation of the electric motor, it is also not possible, for example, for electrostatic charges to be discharged.
- It is accordingly an object of the invention to provide a drive device for a household appliance and method for mounting an electric motor that overcome the hereinafore-mentioned disadvantages of the heretofore-known devices and methods of this general type and that improves the drive device of the type stated at the beginning and also provides an improved household appliance and an improved method for mounting an electric motor.
- With the foregoing and other objects in view, there is provided, in accordance with the invention, a drive device for a household appliance having an electric motor, the drive device including a motor fastening device for fastening the electric motor to the appliance and an insulator disposed between the fastening device and the electric motor for electrically insulating the electric motor from the fastening device, the insulator having a defined resistance for discharging electrostatic charges from the electric motor.
- The invention allows discharge currents to be effectively suppressed in order to ensure the electromagnetic compatibility of the household appliance. Because, the electric motor is not completely electrically insulated, however, electrostatic charges can, nevertheless, be discharged through the defined resistance of the insulating material provided with a residual conductivity.
- The insulating material may be a conductive plastic or else a plastic that is not conductive itself with which conductive material is admixed. In accordance with a further feature of the invention, the conductive material is carbon and/or metal powder.
- In accordance with another feature of the invention, the resistance of the insulator between the electric motor and the fastening device is between approximately 0.5 megaohms and approximately 2 megaohms. Preferably, a defined resistance between the electric motor and its fastening of, preferably, one megaohm is realized as a result. Such a resistance leads to effective suppression of the discharge currents and at the same time allows efficient discharging of an electrostatic charge.
- The defined resistance between the electric motor and its fastening is, advantageously, fixed, on one hand, by the conductivity of the insulating material and, on the other hand, by a defined contact pressure of the insulating material between the electric motor and its fastening. The defined overall resistance is, then, obtained from the sum of the resistances of the insulating material and the electric motor/insulating material and insulating material/fastening transition resistances. The resistance of the insulating material is determined by its residual conductivity; the resistance of the transition resistances is determined by the defined contact pressure.
- In accordance with an added feature of the invention, there is provided a contact pressure device disposed between the electric motor and the fastening device for producing a defined contact pressure.
- In accordance with an additional feature of the invention, to produce a defined transition resistance, the defined contact pressure is, advantageously, realized by a fastening screw. The fastening screw holds the electric motor, for example, on a one-arm bearing cross or directly on a housing of the household appliance, for example, the rear side of the laundry tub in the case of a washing machine. If the fastening screw is tightened with a defined torque, this results in a defined contact pressure, which, in turn, fixes the transition resistance.
- In accordance with yet another feature of the invention, the fastening device has a first clearance for receiving a screw shank of a screw having a screw head with a seating surface and an insulating layer is disposed under the seating surface of the screw head.
- In accordance with yet a further feature of the invention, the screw has a screw shank and a screw head with a seating surface, the fastening device has a first clearance for receiving the screw shank, and an insulating layer is disposed under the seating surface of the screw head.
- The invention also allows the fastening of the electric motor to be performed by only one fastening screw, it being possible, for example, for arresting pins to be provided for the additional rotational fixing of the electric motor. The arresting pins are, advantageously, formed from nonconductive material, that is, from material without residual conductivity, or are coated with a nonconductive material.
- This ensures that the defined resistance between the electric motor and the fastening for discharging the electrostatic charge is determined alone by the insulating material with a defined residual conductance that is used in the region of the fastening screw together with the defined contact pressure.
- The invention is also advantageous because it allows the electric motor to be mounted with only one fastening screw, which is tightened with a defined torque. This has considerable associated cost advantages, in particular, for mass production. Furthermore, this also has advantages for quality assurance.
- In accordance with yet an added feature of the invention, the fastening device has at least a second clearance for receiving the arresting pin.
- In accordance with yet an additional feature of the invention, the fastening device has at least one projection for being received in a corresponding clearance and an insulating layer of an electrically nonconductive material is disposed between the at least one projection and the corresponding clearance.
- The invention is suitable both for a direct drive—for example, an electric motor directly driving the laundry drum—and for an indirect drive—for example, an electric motor which drives the shaft of a laundry drum or a gear mechanism or a V-belt, as disclosed for example by German Published, Non-Prosecuted Patent Application DE 199 11 139 A1, corresponding to U.S. Pat. No. 6,499,323 to Skrippek et al.
- In accordance with again another feature of the invention, the fastening device has a one-arm fastening for the electric motor.
- With the objects of the invention in view, there is also provided a drive device for a household appliance having an electric motor, the drive device including a means for fastening the electric motor to the appliance, and a means for electrically insulating the electric motor from the fastening means disposed between the fastening means and the electric motor, the insulating means having a defined resistance for discharging electrostatic charges from the electric motor.
- With the objects of the invention in view, in a household appliance having an electric motor, there is also provided a drive device including a motor fastening device for fastening the electric motor to the appliance, and an insulator disposed between the fastening device and the electric. motor for electrically insulating the electric motor from the fastening device, the insulator having a defined resistance for discharging electrostatic charges from the electric motor.
- In accordance with again an added feature of the invention, the appliance is a washing machine, a laundry dryer, or a food processor.
- With the objects of the invention in view, there is also provided a method for mounting an electric motor at a household appliance with a fastening screw, including the steps of disposing an insulator of a defined residual conductivity between the electric motor and the household appliance, and tightening a fastening screw with a defined torque to press the insulator between the electric motor and the household appliance with a defined contact pressure and to produce a defined transition resistance.
- With the objects of the invention in view, there is also provided a method for mounting an electric motor at a household appliance, including the steps of disposing an insulator of a defined residual conductivity between the electric motor and the household appliance, mounting the electric motor at the household appliance with a fastening screw, and tightening a fastening screw with a defined torque to press the insulator between the electric motor and the household appliance with a defined contact pressure and to produce a defined transition resistance.
- Other features that are considered as characteristic for the invention are set forth in the appended claims.
- Although the invention is illustrated and described herein as embodied in a drive device for a household appliance and method for mounting an electric motor, it is, nevertheless, not intended to be limited to the details shown because various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
- The construction and method of operation of the invention, however, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
-
FIG. 1 is a lateral cross-sectional view of a drive device according to the invention; -
FIG. 2 is an enlarged, fragmentary, plan view of the drive device ofFIG. 1 ; -
FIG. 3 is a cross-sectional view of the drive device ofFIG. 2 along section line III-III; -
FIG. 4 is a cross-sectional view of an alternative embodiment of the drive device ofFIGS. 2 and 3 ; -
FIG. 5 is a cross-sectional view of another embodiment of the drive device ofFIGS. 2 and 3 ; and -
FIG. 6 is a cross-sectional view of a further alternative embodiment of the drive device ofFIGS. 2 and 3 . - Referring now to the figures of the drawings in detail and first, particularly to
FIG. 1 thereof, there is shown anelectric motor 10, which is connected by afastening screw 12 to a one-arm bearingcross 14. Theelectric motor 10 has a V-belt pulley 16 for receiving a non-illustrated V-belt, for instance, for driving the laundry drum of a washing machine, of a laundry dryer, or of a food processor. The drive device shown inFIG. 1 is a so-called indirect drive because between theelectric motor 10 and the element to be driven there is a gear mechanism—in the example shown, a V-belt gear mechanism. However, the invention is not restricted to such a configuration; it can also be realized in the case of other drive configurations, in particular in the case of direct drives without a gear mechanism interposed. In the case of a direct drive, for instance, thefastening screw 12 of theelectric motor 10 would be fixed directly to a housing of the household appliance, or, for example, to the laundry tub. - Hereafter, elements of the figures that are the same or correspond to one another are designated by the same reference numerals.
FIG. 2 shows a view of a detail of the drive device ofFIG. 1 . Along the sectional line A-A ofFIG. 2 there are arrestingpins 18 along with thefastening screw 12, which engage in corresponding clearances both of the one-arm bearing cross 14 and in the bearingplate 20 of theelectric motor 10. The arresting pins 18 are of an electrically nonconductive plastic. - In a region between the one-
arm bearing cross 14 and the bearingplate 20, there are insulatinglayers 22, which are, likewise, of an electrically nonconductive plastic. The insulating layers 22 may be formed as a structural unit with the arresting pin or pins 18, which is advantageous when mounting theelectric motor 10. - The one-arm bearing cross 14 has a bore for receiving the shank of the
fastening screw 12. The inner side of the bore is coated with an insulatinglayer 24, which is of a material with a defined conductivity. The insulatinglayer 24 extends outside the bore in the one-arm bearing cross 14 to under the seating surface of the screw head of thefastening screw 12 so that the tightenedfastening screw 12 is insulated from the one-arm bearing cross 14 by the insulatinglayer 24. On the other hand, thefastening screw 12 engages in aninternal thread 26 in the bearingplate 20 of theelectric motor 10 so that a connection with good electrical conduction is established between thefastening screw 12 and theelectric motor 10. - The
fastening screw 12 is tightened with a defined torque so that a defined contact pressure is obtained in the region of the seating of the screw head of thefastening screw 12 on the insulatinglayer 24. The defined contact pressure produces a defined transition resistance for the transitions between the one-arm bearing cross 14 and the insulatinglayer 24, on one hand, and the insulatinglayer 24 and thefastening screw 12, on the other hand. The transition resistances defined in this way, together with the defined conductance of the material of the insulatinglayer 24, produce a defined resultant resistance for the electrical connection between the bearingplate 20 of theelectric motor 10 and the one-arm bearing cross 14. - The defined resistance is, advantageously, chosen in the range between 0.5 and 2 megaohms, preferably, 1 megaohm. Such a range ensures, on one hand, effective suppression of the undesired high-frequency discharge currents and, on the other hand, permits the desired discharging of electrostatic charge from the
electric motor 10 through the one-arm bearing cross 14. - The fastening of the
electric motor 10 by the onefastening screw 12 also has the advantage that, when theelectric motor 10 is being mounted, only this onescrew 12 has to be tightened with a defined torque to realize both the mechanical fixing of theelectric motor 10 and the establishment of a defined resistance for discharging electrostatic charges from the electric motor. Because the tightening of thefastening screw 12 constitutes only one working step, this has advantages both with regard to production costs and also with regard to quality control. -
FIG. 4 shows an alternative embodiment of the invention, in which, in comparison with the embodiment ofFIG. 2 , the arrestingpins 18 respectively have projections for realizing the insulatinglayer 22. The projections also serve as a mounting aid because they fix the depth of insertion of the arresting pins 18 into the corresponding bores in the bearingplate 20. The material of the arresting pins 18 and of the insulatinglayer 22 is, in turn, electrically nonconductive so that the defined overall resistance—as in the case of the exemplary embodiment ofFIG. 2 —is determined by the insulatinglayer 24 together with the defined contact pressure of thefastening screw 12. -
FIG. 5 shows a further alternative exemplary embodiment, in which the insulatinglayer 24 is realized in the bearingplate 20 of theelectric motor 10 and thethread 26 is realized in the one-arm bearing cross 14. The bearingplate 20 hasprojections 28, which engage in corresponding clearances in the one-arm bearing cross 14. Between theprojections 28 and their bearing surface with the corresponding clearances is the insulatinglayer 22 of electrically nonconductive material so that the defined overall resistance is, in turn, fixed by the insulatinglayer 24 together with the defined contact pressure by thefastening screw 12. -
FIG. 6 shows a further preferred exemplary embodiment of the invention, in which, in comparison with the exemplary embodiment ofFIG. 5 , the insulatinglayer 24 is, in turn, formed in the one-arm bearing cross 14 and thethread 26 is formed into the bearingplate 20 of theelectric motor 10. Theprojections 28 are located on the bearingplate 20 of theelectric motor 10 and engage in corresponding clearances in the one-arm bearing cross 14, from which they are insulated by an insulatinglayer 22 of nonconductive material.
Claims (18)
1-19. (canceled)
20. A drive assembly comprising:
an electric motor having a bearing plate;
an arm being coupled to the bearing plate and supporting the motor;
a threaded fastener coupling the motor to the arm;
a first insulator being disposed between the bearing plate and the arm and suppressing discharge currents between the electric motor and the arm; and
a second insulator disposed between the threaded fastener and the arm and having an electrical resistance, the second insulator permitting the discharge of electrostatic charges from the electric motor.
21. The drive assembly according to claim 20 , wherein the first and second insulators are made from different materials having different electrical properties from one another.
22. The drive assembly according to claim 20 , wherein the second insulator comprises an electrically conductive plastic material.
23. The drive assembly according to claim 20 , wherein the second insulator comprises a plastic with an admixture of an electrically conductive material including at least one of carbon and metal powder.
24. The drive assembly according to claim 20 , wherein the resistance of the second insulator between the electric motor and the fastening device is between approximately 0.5 megaohm and approximately 2 megaohms.
25. The drive assembly according to claim 20 , wherein the threaded fastener provides a contact pressure on the second insulator in response to a torque applied on the threaded fastener, the electrical resistance of the second insulator being adjustable in response to the contact pressure from the threaded fastener.
26. The household appliance according to claim 20 , wherein at least one of the arm and the bearing plate defines a recess and the other of the arm and the bearing plate includes a projection, the projection extending into the recess to at least partially couple the arm to the bearing plate, the first insulator being at least partially disposed between the projection and the recess.
27. A drive assembly comprising:
an electric motor having a bearing plate;
an arm being coupled to the bearing plate and supporting the motor;
a first insulator being disposed between the bearing plate and the arm; and
a second insulator disposed between the bearing plate and the arm and having an electrical resistance, wherein the first and second insulators do not contact one another.
28. The drive assembly according to claim 27 , wherein the first insulator suppresses discharge currents between the electric motor and the arm, the second insulator permitting the discharge of electrostatic charges from the electric motor to the arm.
29. The drive assembly according to claim 27 , further comprising a threaded fastener coupling the motor to the arm, the second insulator being disposed between the threaded fastener and at least one of the arm and the bearing plate.
30. The drive assembly according to claim 28 , wherein the threaded fastener directly contacts the other of the arm and the bearing plate in an electrically conductive connection.
31. The drive assembly according to claim 28 , wherein the second insulator is disposed between the threaded fastener and the arm and the threaded fastener is directly contacts the bearing plate in an electrically conductive connection.
32. The drive assembly according to claim 28 , wherein the threaded fastener provides a contact pressure on the second insulator in response to a torque applied on the threaded fastener, the electrical resistance of the second insulator being adjustable in response to the contact pressure from the threaded fastener.
33. A drive assembly comprising:
an electric motor having a bearing plate defining a plate recess;
an arm being coupled to the bearing plate and supporting the motor, the arm defining an arm recess;
a threaded fastener coupling the motor to the arm;
a first insulator being disposed between the bearing plate and the arm;
a second insulator disposed between the threaded fastener and the arm and having an electrical resistance; and
an arresting pin extending into the arm and plate recesses to at least partially couple the arm to the bearing plate, the arresting pin at least partially forming the first insulator.
34. The household appliance according to claim 32 , wherein the arm defines a second arm recess and the bearing plate defines a second plate recess, a second arresting pin extending into the second arm recess and second plate recess to at least partially couple the arm to the bearing plate, the second arresting pin at least partially forming the first insulator.
35. The drive assembly according to claim 32 , wherein the first insulator suppresses discharge currents between the electric motor and the arm, the second insulator permitting the discharge of electrostatic charges from the electric motor to the arm.
36. The drive assembly according to claim 32 , wherein the threaded fastener provides a contact pressure on the second insulator in response to a torque applied on the threaded fastener, the electrical resistance of the second insulator being adjustable in response to the contact pressure from the threaded fastener.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/903,833 US20080019065A1 (en) | 2000-12-14 | 2007-09-24 | Drive device for a household appliance and method for mounting an electric motor |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10062364A DE10062364A1 (en) | 2000-12-14 | 2000-12-14 | Drive device for a household appliance and method for assembling an electric motor |
DE10062364.6 | 2000-12-14 | ||
PCT/EP2001/013448 WO2002048444A2 (en) | 2000-12-14 | 2001-11-20 | Drive device for a domestic appliance and a method for mounting an electromotor |
US10/462,421 US7320185B2 (en) | 2000-12-14 | 2003-06-16 | Drive device for a household appliance and method for mounting an electric motor |
US11/903,833 US20080019065A1 (en) | 2000-12-14 | 2007-09-24 | Drive device for a household appliance and method for mounting an electric motor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/462,421 Division US7320185B2 (en) | 2000-12-14 | 2003-06-16 | Drive device for a household appliance and method for mounting an electric motor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080019065A1 true US20080019065A1 (en) | 2008-01-24 |
Family
ID=7667152
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/462,421 Expired - Fee Related US7320185B2 (en) | 2000-12-14 | 2003-06-16 | Drive device for a household appliance and method for mounting an electric motor |
US11/903,833 Abandoned US20080019065A1 (en) | 2000-12-14 | 2007-09-24 | Drive device for a household appliance and method for mounting an electric motor |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/462,421 Expired - Fee Related US7320185B2 (en) | 2000-12-14 | 2003-06-16 | Drive device for a household appliance and method for mounting an electric motor |
Country Status (5)
Country | Link |
---|---|
US (2) | US7320185B2 (en) |
EP (1) | EP1348055B1 (en) |
AT (1) | ATE423864T1 (en) |
DE (2) | DE10062364A1 (en) |
WO (1) | WO2002048444A2 (en) |
Cited By (2)
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US20090049707A1 (en) * | 2007-08-22 | 2009-02-26 | Miele & Cie.Kg | Laundry dryer with a holding device |
ES2430948A1 (en) * | 2012-05-22 | 2013-11-22 | BSH Electrodomésticos España S.A. | Electrical household appliance with motor fixing system |
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DE10062364A1 (en) * | 2000-12-14 | 2002-06-20 | Bsh Bosch Siemens Hausgeraete | Drive device for a household appliance and method for assembling an electric motor |
US7958651B2 (en) * | 2006-05-19 | 2011-06-14 | Maniha Allan M | Clothes dryer rake |
KR101407962B1 (en) * | 2007-05-22 | 2014-06-17 | 삼성전자 주식회사 | Washing machine and tub thereof |
US20090000139A1 (en) * | 2007-06-29 | 2009-01-01 | Hodges Timothy M | Clothes dryer air intake system |
DE102007052083A1 (en) * | 2007-10-31 | 2009-05-07 | BSH Bosch und Siemens Hausgeräte GmbH | Domestic appliance with adsorption dryer |
ITPD20080159A1 (en) | 2008-05-30 | 2009-11-30 | Ln 2 S R L | PERFECT ELECTRIC MOTOR |
KR20100096856A (en) * | 2009-02-25 | 2010-09-02 | 엘지전자 주식회사 | Washing machine |
WO2012115622A1 (en) * | 2011-02-22 | 2012-08-30 | International Truck Intellectual Property Company, Llc | Hanger assembly |
DE102011083652A1 (en) * | 2011-09-28 | 2013-03-28 | BSH Bosch und Siemens Hausgeräte GmbH | Arrangement with a tub of a washing machine and a drive motor and washing machine |
US20130239428A1 (en) * | 2012-03-14 | 2013-09-19 | Alliance Laundry Systems Llc | Method to reverse cylinder drive in a direct belt on basket dryer/tumbler |
EP3165664B1 (en) * | 2015-11-05 | 2020-07-22 | Electrolux Appliances Aktiebolag | Washing group for laundry washing machines |
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- 2001-11-20 AT AT01991741T patent/ATE423864T1/en not_active IP Right Cessation
- 2001-11-20 DE DE50114734T patent/DE50114734D1/en not_active Expired - Lifetime
- 2001-11-20 EP EP01991741A patent/EP1348055B1/en not_active Expired - Lifetime
-
2003
- 2003-06-16 US US10/462,421 patent/US7320185B2/en not_active Expired - Fee Related
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US2886106A (en) * | 1954-06-01 | 1959-05-12 | Int Register Co | Timing mechanism |
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Also Published As
Publication number | Publication date |
---|---|
WO2002048444A3 (en) | 2002-08-08 |
EP1348055A2 (en) | 2003-10-01 |
US20040084602A1 (en) | 2004-05-06 |
EP1348055B1 (en) | 2009-02-25 |
WO2002048444A2 (en) | 2002-06-20 |
ATE423864T1 (en) | 2009-03-15 |
DE10062364A1 (en) | 2002-06-20 |
DE50114734D1 (en) | 2009-04-09 |
US7320185B2 (en) | 2008-01-22 |
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Legal Events
Date | Code | Title | Description |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |