EP2239091A1 - Electric hand tool with brushless motor device for grinding or drilling - Google Patents
Electric hand tool with brushless motor device for grinding or drilling Download PDFInfo
- Publication number
- EP2239091A1 EP2239091A1 EP10305330A EP10305330A EP2239091A1 EP 2239091 A1 EP2239091 A1 EP 2239091A1 EP 10305330 A EP10305330 A EP 10305330A EP 10305330 A EP10305330 A EP 10305330A EP 2239091 A1 EP2239091 A1 EP 2239091A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power
- machine
- shaft
- motor
- brushless
- Prior art date
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
Definitions
- the invention relates to the technical sector of electrical machines and apparatus that are intended for the execution of sanding, cleaning, surfacing, grinding, drilling on wall walls or floors or ceilings to be treated in buildings or buildings or surfaces to renovate.
- the machines and electrical appliances are very diverse and are arranged with a conventional motor of the universal motor type with or without geared motors according to the applications, and operating at a frequency of 50 hertz.
- the DC or AC motors remain nevertheless bulky and bulky, heavy to handle according to the needs and applications.
- the weight of the motor assembly becomes a delicate parameter to be managed by the operator.
- figure 1 an example of the applicant's attempt to mount a standard brushless brushless motor (A) on a hand sander that requires two external cables (C1-C2), one for power and one for power measurement, these two cables being widely apparent and troublesome in handling.
- the transmission of efforts on the tool remains very random without matching this type of brushless motor.
- the loss of power is substantial of the order of 35 to 50%.
- the useful power is of the order of 780 W.
- the portable machine for sanding, surfacing, grinding and drilling applications is remarkable in that it comprises a brushless motorisation device, and in that the device comprises a motor unit whose end of the motor shaft is arranged with a fastener secured to the frame of the motor and arranged to constitute the support of a cage ring allowing mounting on said end of the drive shaft of a tapered bearing and a lip seal, the end of the shaft being supported for the reception of the working tool, and in that the drive device is associated with a frequency converter allowing a frequency preselection between 0 Hz and 300 Hz.
- the brushless motor drive is referenced as a whole by (D) and includes a brushless motor unit (1) of standard construction.
- the application of this type of motor to machines and electrical devices requires, according to the invention, an arrangement of the mechanical part to allow work at the end of the motor shaft.
- This planning consists, referring to the Figures 3 and 4 at one end (2) of the drive shaft, to have a fixing piece (3) integral with the chassis of the brushless motor and arranged to constitute the support of a ring (4) forming a cage allowing mounting on the end of the driving shaft of a conical bearing (5) and a lip seal (6), the end of the shaft being supported for receiving the working tool (7).
- the motorization device is associated with a frequency converter (10) allowing a preselection of frequencies in a range of 0 Hz to 300 Hz.
- Said frequency converter is fixed on the power-driven machine, for example at the end of the frequency converter.
- the association with the frequency converter makes it possible, thanks to the obtaining of a higher speed of rotation, an increase of the useful power. It has thus been found that for a conventional brushless motor with an advertised power of 980 W, the implementation of the invention in connection with the frequency converter provides a useful power of 950 W.
- the motorization device operates without encoder, without resolver and without Hall effect probe, the device working in open loop with a precision on the speed of the order of 2%.
- the electronics (E) is transferred from the motor unit at the arm of the machine such as a sander
- the tool (7) which may be a diamond disk or the like depending on the application concerned, is mounted directly on the motor shaft, which has the advantage of reducing the parts likely to user, a limitation of yield losses due to the use of speed reducer used in the previous equipment.
- Another advantage lies in the tightness of the engine which makes it possible to work in hostile, dusty or humid environments because the cooling is not necessary contrary to the universal motor which has a ventilation by the interior.
- the solution provided also offers a considerable reduction of the noise due to the force generated by the brushless motor, an improvement of the useful power
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
L'invention se rattache au secteur technique des machines et appareils électroportatifs qui sont destinés à l'exécution de travaux de ponçage, nettoyage, surfaçage, meulage, forage sur des parois de murs ou sols ou plafonds à traiter dans des constructions ou bâtiments ou surfaces à rénover.The invention relates to the technical sector of electrical machines and apparatus that are intended for the execution of sanding, cleaning, surfacing, grinding, drilling on wall walls or floors or ceilings to be treated in buildings or buildings or surfaces to renovate.
Les machines et appareils électroportatifs sont très divers et sont agencés avec une motorisation classique du type moteur universel avec ou sans motoréducteurs selon les applications, et fonctionnant selon une fréquence à 50 hertz.The machines and electrical appliances are very diverse and are arranged with a conventional motor of the universal motor type with or without geared motors according to the applications, and operating at a frequency of 50 hertz.
Les motorisations à courant continu ou alternatif restent néanmoins volumineuses et encombrantes, lourdes à manipuler selon les besoins et applications. Par exemple, dans le cas de ponceuses à bras qui sont manipulées par l'utilisateur à longueur de journée, le poids de l'ensemble de motorisation devient un paramètre délicat à gérer par l'opérateur.The DC or AC motors remain nevertheless bulky and bulky, heavy to handle according to the needs and applications. For example, in the case of hand sanders that are manipulated by the user all day long, the weight of the motor assembly becomes a delicate parameter to be managed by the operator.
Le demandeur s'est du reste penché sur cette question et de très nombreux brevets ont été déposés pour aider à la manipulation de ce type particulier de machines électroportatives. Dans tous les cas, concernant le demandeur, les travaux d'études ou de recherches n'ont pas concerné la partie motorisation en tant que telle.The applicant has in fact addressed this issue and many patents have been filed to assist in the handling of this particular type of power tool. In all cases, concerning the applicant, the studies or research did not concern the motorization part as such.
Un autre inconvénient réside dans le bruit résultant du fonctionnement de cette motorisation qui peut être « adouci » mais non supprimé.Another disadvantage is the noise resulting from the operation of this engine which can be "softened" but not deleted.
Le demandeur s'est donc intéressé de manière nouvelle à cette question. C'est ainsi que le demandeur s'est intéressé aux ensembles de motorisation « BRUSHLESS », c'est-à-dire sans balais qui offrent de nombreux avantages, de légèreté, d'économie, dans le sens de supprimer le nettoyage et/ou remplacement des balais. Le problème réside cependant dans l'inadaptation de ce type de moteur sans balai dans l'outillage et les machines électroportatives. L'utilisation de moteurs sans balais dits « brushless » reste réservée à des domaines techniques à certains domaines de l'industrie en particulier les servo-mécanismes des machines, ou en robotique, aussi en aéromodélisme, type avions, hélicoptères, et aussi modèles réduits de voitures. La technologie de ce type de moteurs sans balai (brushless) est fragile, délicate, requiert une électronique de pilotage, des capteurs d'effet HALL permettant d'identifier la position des aimants associés au rotor. Le fonctionnement de ce type de moteur est établi sur la base d'une fréquence de 50 hertz.The applicant has therefore taken a new interest in this issue. This is why the applicant was interested in "BRUSHLESS" motorisation kits, that is to say without brushes that offer many advantages, lightness, economy, in the sense of eliminating cleaning and / or or replacement of the brushes. The problem lies, however, in the unsuitability of this type of brushless motor in tools and power tools. The use of so-called "brushless" brushless motors remains reserved for technical fields in certain fields of the industry, in particular machine servo-mechanisms, or in robotics, also in model aircraft, like planes, helicopters, and also reduced models. of cars. The technology of this type of brushless motor is fragile, delicate, requires a control electronics, HALL effect sensors to identify the position of the magnets associated with the rotor. The operation of this type of motor is established on the basis of a frequency of 50 hertz.
Cette technologie des moteurs sans balai « brushless » n'est pas, à la connaissance du demandeur, appliqué dans les machines et appareils électroportatifs. Cela peut peut-être s'expliquer par les conditions d'utilisation de certaines machines électroportatives du type ponceuses, et leurs conditions d'utilisation qui seraient incompatibles avec les précautions nécessaires quant à l'usage de ce type de motorisation avec toute la partie électronique qui lui est associée.This technology brushless brushless motors is not, to the knowledge of the applicant, applied in machinery and electrical appliances. This can perhaps be explained by the conditions of use of certain electric machines of the type sander, and their conditions of use which would be incompatible with the necessary precautions as for the use of this type of motorization with all the electronic part associated with it.
Cela s'explique aussi par le fait aussi que les moteurs sans balai (brushless) ne sont pas tels conçus et applicables tels quels sur des machines et appareils électroportatifs pour effectuer, par exemple, des travaux de ponçage, de meulage, de surfaçage.This is also explained by the fact that the brushless motors are not such designed and applicable as such on machines and electrical devices to perform, for example, sanding, grinding, surfacing.
La démarche du demandeur s'est cependant orientée en égard de l'intérêt pratique de ce type de motorisation particulièrement silencieuse à leur intégration dans des machines et appareils électroportatifs.The applicant's approach has, however, been oriented towards the practical interest of this type of motorization, which is particularly silent for their integration into electrical machines and appliances.
On a représenté,
La solution apportée pour résoudre ce problème a été d'apporter des réponses aussi bien sur la partie mécanique que sur la partie électronique des moteurs connus actuels sans balai dits « brushless », et aussi en vue d'une limitation de la perte de puissance.The solution provided to solve this problem has been to provide answers both on the mechanical part and on the electronic part of current known brushless brushless motors, and also with a view to limiting the power loss.
Selon une première caractéristique, la machine électroportative destinée à des applications de ponçage, surfaçage, meulage, forage est remarquable en ce qu'elle comprend un dispositif de motorisation sans balai, et en ce que le dispositif comprend un bloc moteur dont l'extrémité de l'arbre moteur est agencé avec une pièce de fixation solidaire du châssis du moteur et agencée pour constituer l'appui d'une bague formant cage autorisant le montage sur ladite extrémité de l'arbre moteur d'un roulement conique et d'un joint à lèvres, l'extrémité de l'arbre étant épaulé pour la réception de l'outil de travail, et en ce que le dispositif de motorisation est associé à un variateur de fréquence autorisant une présélection de fréquence entre 0 Hz et 300 Hz.According to a first characteristic, the portable machine for sanding, surfacing, grinding and drilling applications is remarkable in that it comprises a brushless motorisation device, and in that the device comprises a motor unit whose end of the motor shaft is arranged with a fastener secured to the frame of the motor and arranged to constitute the support of a cage ring allowing mounting on said end of the drive shaft of a tapered bearing and a lip seal, the end of the shaft being supported for the reception of the working tool, and in that the drive device is associated with a frequency converter allowing a frequency preselection between 0 Hz and 300 Hz.
Ces caractéristiques et d'autres encore ressortiront bien de la suite de la description.These and other characteristics will be apparent from the rest of the description.
L'invention est exposée ci-après plus en détail à l'aide des figures des dessins annexés dans lesquels :
- La
figure 1 illustre, à titre d'exemple, un essai de montage d'un moteur sans balai (brushless) standard sur une ponceuse à bras. - La
figure 2 illustre le dispositif de motorisation sans balai selon l'invention équipant une ponceuse à bras, avec le variateur de fréquence. - La
figure 3 montre, avant montage, le dispositif de motorisation sans balai. - La
figure 4 est une vue en coupe transversale du dispositif monté selon l'invention.
- The
figure 1 illustrates, for example, a test of mounting a standard brushless motor on a sander. - The
figure 2 illustrates the brushless motorization device according to the invention equipping a sander with arms, with the frequency converter. - The
figure 3 shows, before mounting, the brushless motor device. - The
figure 4 is a cross-sectional view of the device mounted according to the invention.
Afin de rendre plus concret l'objet de l'invention, on le décrit maintenant d'une manière non limitative illustrée aux figures des dessins.In order to make the object of the invention more concrete, it is now described in a nonlimiting manner illustrated in the figures of the drawings.
Le dispositif de motorisation sans balai est référencé dans son ensemble par (D) et comprend un bloc moteur (1) sans balai, de construction standard. L'application de ce type de moteur à des machines et appareils électroportatifs requiert, selon l'invention, un aménagement de la partie mécanique pour permettre un travail en bout d'arbre moteur. Cet aménagement consiste, en se référant aux
Selon une autre disposition, le dispositif de motorisation est associé à un variateur de fréquence (10) autorisant une présélection de fréquences dans une plage de 0 Hz à 300 Hz. Ledit variateur de fréquence est fixé sur la machine électroportative, par exemple en bout de bras de la ponceuse à bras, ou sur le bloc aspirant associé à la ponceuse à bras ou sur un chariot desserte permettant le transport de la ponceuse à bras. L'association avec le variateur de fréquence permet, grâce à l'obtention d'une vitesse de rotation plus grande une augmentation de la puissance utile. Il a ainsi été constaté que pour un moteur sans balai classique avec une puissance annoncée de 980 W, la mise en oeuvre de l'invention en liaison avec le variateur de fréquence permet d'obtenir une puissance utile de 950 W.According to another arrangement, the motorization device is associated with a frequency converter (10) allowing a preselection of frequencies in a range of 0 Hz to 300 Hz. Said frequency converter is fixed on the power-driven machine, for example at the end of the frequency converter. arm sander arm, or on the suction block associated with the arm sander or on a trolley for transporting the arm sander. The association with the frequency converter makes it possible, thanks to the obtaining of a higher speed of rotation, an increase of the useful power. It has thus been found that for a conventional brushless motor with an advertised power of 980 W, the implementation of the invention in connection with the frequency converter provides a useful power of 950 W.
Selon une autre disposition de l'invention, le dispositif de motorisation fonctionne sans codeur, sans résolveur et sans sonde à effet Hall, le dispositif travaillant en boucle ouverte avec une précision sur la vitesse de l'ordre de 2 %. En outre, l'électronique (E) est transférée du groupe moteur en bout de bras de la machine telle que une ponceuse à brasAccording to another embodiment of the invention, the motorization device operates without encoder, without resolver and without Hall effect probe, the device working in open loop with a precision on the speed of the order of 2%. In addition, the electronics (E) is transferred from the motor unit at the arm of the machine such as a sander
(P) ce qui permet la suppression d'un des câbles illustré
Selon l'invention, l'outil (7), qui peut être un disque diamant ou autre en fonction de l'application concernée, est monté directement sur l'arbre moteur, ce qui a pour avantage une réduction des pièces susceptible de s'user, une limitation des pertes de rendement dues à l'utilisation de réducteur de vitesse utilisé dans les équipements antérieurs.According to the invention, the tool (7), which may be a diamond disk or the like depending on the application concerned, is mounted directly on the motor shaft, which has the advantage of reducing the parts likely to user, a limitation of yield losses due to the use of speed reducer used in the previous equipment.
Un autre avantage réside dans l'étanchéité du moteur qui permet de travailler dans des milieux hostiles, poussiéreux ou humides car le refroidissement n'est pas nécessaire contrairement au moteur universel qui possède une ventilation par l'intérieur.Another advantage lies in the tightness of the engine which makes it possible to work in hostile, dusty or humid environments because the cooling is not necessary contrary to the universal motor which has a ventilation by the interior.
La solution apportée offre en plus une réduction considérable du bruit de par l'effort généré par le moteur sans balai, une amélioration de la puissance utileThe solution provided also offers a considerable reduction of the noise due to the force generated by the brushless motor, an improvement of the useful power
Les avantages ressortent bien de l'invention. On souligne, en particulier, les applications nouvelles des moteurs sans balai impossibles à envisager pour les machines électroportatives.The advantages are apparent from the invention. In particular, new applications of brushless motors that can not be considered for power-operated machines are emphasized.
Claims (7)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0952179A FR2943935B1 (en) | 2009-04-03 | 2009-04-03 | ELECTROPORTATIVE MACHINE WITH "NO BRUSH" MOTORIZATION DEVICE FOR SANDING, SURFACING, GRINDING, DRILLING APPLICATIONS, IN PARTICULAR. |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2239091A1 true EP2239091A1 (en) | 2010-10-13 |
Family
ID=41190717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10305330A Withdrawn EP2239091A1 (en) | 2009-04-03 | 2010-03-31 | Electric hand tool with brushless motor device for grinding or drilling |
Country Status (2)
Country | Link |
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EP (1) | EP2239091A1 (en) |
FR (1) | FR2943935B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2564992A1 (en) * | 2011-09-02 | 2013-03-06 | M.B.H. Developpement | Device with electric motor with built-in cooling circuit for controlling tools |
FR2980392A1 (en) * | 2011-09-23 | 2013-03-29 | Bosch Gmbh Robert | TOOL ACCESSORY |
WO2014071835A1 (en) * | 2012-11-07 | 2014-05-15 | Ying Shili | Direct-drive electric tool |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE446955C (en) * | 1924-10-17 | 1927-07-13 | Eugen Lauer Schmaltz Dipl Ing | Outrunner drive motor for machine tools |
US4428162A (en) * | 1979-07-26 | 1984-01-31 | M.A.N.-Roland Druckmaschinen Aktiengesellschaft | Grinding machine and control for removing burrs or fins from workpieces such as castings |
US6123158A (en) * | 1996-08-03 | 2000-09-26 | Wacker-Werke Gmbh & Co., Kg | Electric tool with ducted cooled control electronics |
EP1081827A1 (en) * | 1999-09-01 | 2001-03-07 | Ramachandran Ramarathnam | A portable electric tool |
US20040132391A1 (en) * | 2002-08-08 | 2004-07-08 | Levik Kodaverdian | Floor edger |
WO2006118533A1 (en) * | 2005-05-01 | 2006-11-09 | Stridsberg Innovation Ab | Releasable rotor |
-
2009
- 2009-04-03 FR FR0952179A patent/FR2943935B1/en active Active
-
2010
- 2010-03-31 EP EP10305330A patent/EP2239091A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE446955C (en) * | 1924-10-17 | 1927-07-13 | Eugen Lauer Schmaltz Dipl Ing | Outrunner drive motor for machine tools |
US4428162A (en) * | 1979-07-26 | 1984-01-31 | M.A.N.-Roland Druckmaschinen Aktiengesellschaft | Grinding machine and control for removing burrs or fins from workpieces such as castings |
US6123158A (en) * | 1996-08-03 | 2000-09-26 | Wacker-Werke Gmbh & Co., Kg | Electric tool with ducted cooled control electronics |
EP1081827A1 (en) * | 1999-09-01 | 2001-03-07 | Ramachandran Ramarathnam | A portable electric tool |
US20040132391A1 (en) * | 2002-08-08 | 2004-07-08 | Levik Kodaverdian | Floor edger |
WO2006118533A1 (en) * | 2005-05-01 | 2006-11-09 | Stridsberg Innovation Ab | Releasable rotor |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2564992A1 (en) * | 2011-09-02 | 2013-03-06 | M.B.H. Developpement | Device with electric motor with built-in cooling circuit for controlling tools |
FR2979562A1 (en) * | 2011-09-02 | 2013-03-08 | Mbh Dev | ELECTRIC MOTOR DEVICE WITH INTEGRATED COOLING CIRCUIT FOR CONTROLLING TOOLS |
FR2980392A1 (en) * | 2011-09-23 | 2013-03-29 | Bosch Gmbh Robert | TOOL ACCESSORY |
WO2014071835A1 (en) * | 2012-11-07 | 2014-05-15 | Ying Shili | Direct-drive electric tool |
Also Published As
Publication number | Publication date |
---|---|
FR2943935B1 (en) | 2011-06-10 |
FR2943935A1 (en) | 2010-10-08 |
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