Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/16—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
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
  • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
  • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
  • F16C35/067—Fixing them in a housing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
  • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P1/00—Details of instruments
  • G01P1/02—Housings
  • G01P1/026—Housings for speed measuring devices, e.g. pulse generator
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
  • G01P3/42—Devices characterised by the use of electric or magnetic means
  • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
  • G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
  • G01P3/42—Devices characterised by the use of electric or magnetic means
  • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
  • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
  • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
  • G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
• • 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
  • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
  • H02K11/21—Devices for sensing speed or position, or actuated thereby
  • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
  • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
  • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
  • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
  • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
  • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
  • F16C2208/20—Thermoplastic resins
  • F16C2208/60—Polyamides [PA]
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
  • F16C2208/20—Thermoplastic resins
  • F16C2208/70—Polyesters, e.g. polyethylene-terephthlate [PET], polybutylene-terephthlate [PBT]
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2220/00—Shaping
  • F16C2220/02—Shaping by casting
  • F16C2220/04—Shaping by casting by injection-moulding
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2233/00—Monitoring condition, e.g. temperature, load, vibration
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2380/00—Electrical apparatus
  • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Definitions

• the present invention relates to the field of electric motors and more particularly that of the supports for ensuring the mechanical connection between a rotating shaft and an electric motor housing.
• JP-A-08023666 discloses a brushless motor, comprising a fastener associated with a Hall effect sensor for detecting magnets mounted on the shaft.
• the shaft is rotatably mounted in the fastener by means of bearings.
• the present invention aims to overcome the disadvantages of the state of the art mentioned above.
• the present invention provides a multifunctional shaft support.
• the present invention provides a bearing and flange subassembly ensuring the mechanical connection between the shaft and the motor housing, and serving as a support for the sensor and the signal processing electronics.
• the shaft support system for an electric motor comprises a rolling bearing provided with an inner ring adapted to be mounted on the shaft and an outer ring, at least one angular position sensor for detecting the angular position. of the inner ring, an encoder mounted on the inner ring, a flange support of the outer ring of the bearing, and a processing module supported by the flange.
• the support is a subset providing the functions of bearing, flange, and angular detection.
• the senor is mounted on the processing module connected to an output of the sensor.
• the processing module is configured to receive an output signal of the sensor or sensors representative of the angular position of the encoder relative to the sensor and to output processed information representative of the angular position of the encoder relative to to the sensor.
• the support also provides the function of processing the angular detection information
• the flange is sealed.
• the flange comprises fixing means on an electric motor.
• the fixing means may comprise through holes for screwing the flange on the sensor of the electric motor.
• the system includes sealing means with an end of the inner ring.
• the flange thus forms the axial end of an engine and prohibits an entry of liquid or pollutants.
• the seal may be of the narrow passage type or friction lip with the encoder or the inner ring or the motor shaft.
• the angular position sensor is capable of detecting an absolute angular position. It is thus possible to know precisely the angular shoulder position of the rotor relative to the stator, which is particularly useful in the case of a brushless DC motor.
• the processing module comprises an electronic card supporting the one or more sensors.
• the processing module is configured to output output information in analog or digital form.
• the flange is overmolded on the outer ring.
• the outer ring comprises a surface in contact with the flange provided with hooking reliefs. Said surface may be the outer surface of the outer ring.
• the hooking reliefs can be obtained by knurling.
• the processing module is configured to output output information in the form of pulse width modulation.
• the invention also relates to an electric motor comprising a shaft, a rotor, a stator and a system as above supporting the shaft, mounted in the stator and capable of outputting the angular position of the rotor relative to the stator.
• said system closes an axial end of the engine. This gives an excellent seal.
• the method of manufacturing a shaft support system for an electric motor comprises the steps of fixing a flange on a bearing outer ring equipped with an encoder, mounting on the flange of a treatment module. equipped with an angle sensor, the sensor and the processing module being connected.
• the flange and the rolling bearing are fixed to one another in a way that can not be dismantled.
• the flange is overmolded on the outer ring. This gives an excellent seal.
• the assembly of the motor can be carried out by orienting the rotor, bringing the shaft support system by an axial movement, the rotor shaft passing in the rolling bearing and fixing the flange on the housing of the electric motor. Fixing can be done by screwing.
• the encoder is advantageously supported by a bearing ring.
• the support system is compact axially, is capable of sealing the engine by mounting a single subassembly, locally provides a processing of the output signals of the sensor or sensors in the immediate vicinity of the sensor or sensors. where better signal quality. Indeed, the processed output information is less sensitive to external noise or influences than the output signals of the sensor or sensors, especially when the processed output information is in digital form or pulse width modulation.
• FIG 1 is an exploded sectional view of an electric motor
• FIG 2 is a sectional view of the electric motor
• FIG. 3 is a perspective view of the shaft support
• FIG. 4 is a perspective view opposite to FIG. 3 of the shaft support
• FIG. 5 is an exploded perspective view of the shaft support; and FIG 6 is an axial sectional view of the shaft support.
• the electric motor referenced 1 as a whole comprises a housing 2, a stator 3 mounted in the housing 2, a rotor 4 and a shaft 5 integral in rotation with one another, a rolling bearing 6 disposed between one end of the shaft 5 and the housing 2, and a shaft support system
• the housing 2 comprises an axial portion 8, a radial bottom 9 closing one of the ends of the axial portion 8, and an axial flange 10 fixed to the radial bottom 9, centered on the axis of the motor and provided for receiving the rolling bearing 6.
• the rolling bearing 6 may be of conventional type with an inner ring January 1, an outer ring 12, a row of rolling elements 13, here balls, arranged between an outer raceway of the inner ring January 1 and a path
• the bearing 6 may be provided with a cage for holding the circumferential spacing of the rolling elements 13 as well as a seal 14 disposed on the opposite side to the radial bottom 9.
• the presence of a seal on the side of the radial bottom 9 is not essential, insofar as the closed radial bottom 9 effectively protects the bearing 6 against the intrusion of external pollutants.
• One end of the shaft 5 is fitted into the inner ring January 1.
• the stator 3 is in the form of a tubular piece, coming close to the radial bottom 9 of the casing 2 and in contact with the bore of the axial portion 8.
• the stator 3 further comprises three axial pins 15 projecting from direction opposite to the radial bottom 9.
• the rotor 4 is fixed on the shaft 5 and is mounted inside the stator 3 while being rotatable relative to said stator 3.
• the support system 7 for the shaft 5, seen in more detail in FIGS. 3 to 5, comprises a flange 16, a rolling bearing 17 supported by the flange 16, an electronic processing module 18 also supported by the flange 16 , an encoder 19 supported by the rolling bearing 17 and at least one sensor 20 supported by the module
• the support system 7 closes the end of the casing 2 on the opposite side to the radial bottom 9.
• the flange 16 comprises a wall of generally radial annular shape 21 extending outwardly by four equally radial ears 22. Each lug 22 is provided with a through hole 23 allowing the passage of a dowel or a screw to fix the support system 7 on the housing 2.
• the flange 16 is provided with an annular rib 24 extending axially towards the radial bottom 9 and in contact with the bore of the axial portion 8 of the casing 2, thus ensuring the centering of the flange 7 in the casing 2.
• a plurality of recesses 25, in the form of an arc of a circle, are formed on the outer face of the flange 16 radially at the rib 24 for reasons of demolding withdrawal and differential cooling , thus avoiding that a thick part is cooled more slowly than finer parts.
• a plurality of through holes 26, here three in number, are formed in the annular radial portion 21 and are provided to receive the fingers 15 of the stator 3.
• the stator 3 is thus immobilized in rotation relative to the support system 7.
• the flange 16 comprises a frustoconical portion 27 extending from the annular radial portion 21, radially inwardly and axially towards the radial bottom 9 of the casing 2, an annular radial portion 28 extending inwardly the frustoconical portion. 27 and an annular axial portion 29 for housing the bearing
• Rigidification ribs may be provided between the radial portion 28 and the axial portion 29 in the extension of the frustoconical portion 27.
• the radial portion 28 has a bore 29a delimited by two inwardly directed radial flanges 30 and 31.
• a plurality of axial fingers 32 are provided projecting from the radial portion 28, in a direction opposite to the radial bottom 9 of the housing 2.
• the flange 16 is advantageously made integrally in a synthetic material coming from molding, for example comprising polyamide 6-6 or polyethylene terephthalate loaded with glass or carbon fibers, for example in a proportion of the order of 10 to 50%, preferably of the order of 20 to 40%, for example about 30%.
• the rolling bearing 17 comprises an inner ring 33, an outer ring 34, a row of rolling elements 35, here balls, a cage 36 for maintaining the regular circumferential spacing of the rolling elements 35 and a sealing flange 37
• the bearing 17 represents a similar structure to the bearing 6 with two solid deep groove rings forming a raceway in the bore of the outer ring and on an outer bearing surface of the inner ring.
• the flange 37 is mounted in a groove of the outer ring 34 and forms a narrow passage with an outer bearing surface of the inner ring 33 being disposed on the side of the rotor 4.
• the outer ring 34 is in contact with the bore 29a of the axial portion 29 and the radial flanges 30 and 31 of the flange 16.
• the flange 16 is overmolded on the outer ring 34.
• the encoder 19 comprises a support 38, in the form of a sheet metal cup, and an active part 39.
• the support 38 comprises an axial portion fitted on an outer surface of the inner ring 33, on the opposite side to the sealing flange 37, a radial portion directed inwardly from the axial portion and in contact with a radial front surface of the inner ring 33 and a frustoconical portion directed radially inward and axially opposite the sealing flange 37 and extending the small diameter end of the radial part.
• the active part 39 for example a magnetized plasto-ferrite comprising a plurality of circumferentially alternating north and south poles, is overmolded on the outer face of the frustoconical portion, one face of the radial portion opposite the inner ring 33 and part of the outer face of the axial part.
• the active portion 39 has an axial outer surface and may comprise a number of poles not multiple of the number of sensors.
• the electronic module 18 comprises an electronic card 40 of generally annular shape, in which are formed a plurality of through holes 41, here three in number, provided to cooperate with the fingers 32 of the flange 16. During assembly, the fingers
• the electronic card 40 for example of the printed circuit type, supports a plurality of electronic components making it possible to process the output signals of the sensors 20 and generate an output signal transmitted to other organs not shown, by wire or radio.
• the electronic card 40 also supports the sensors 20 by means of four groups of three holes 43 formed near its inner edge and in which lugs 44 of the sensor elements 20 are arranged and then fixed, generally by brazing.
• the sensors 20 may be arranged circumferentially evenly distributed or not.
• the electronic module 18 is disposed near the outer face of the radial portion 28 of the flange 16.
• the sensor elements 20 project axially relative to the electronic board 40 and are arranged radially between the encoder 19 and the radial flange 31 of the radial portion 28, while being separated from the axial outer surface of the active portion 39 of the encoder 19 by a small radial gap.
• the electronic module 18 and the encoder 19 have an inside diameter greater than the bore of the inner ring 33 in order to pass an end of the shaft 5 of the electric motor.
• a shaft support system forming a pre-assembled subassembly intended to be disposed at the open axial end of the casing 2 and providing the support functions of the rotating shaft of the electric motor. closing the open radial face of the casing 2, anti-rotation of the stator 3, detection of rotation parameters of the shaft 5, in particular the speed, the angular position, the acceleration, etc.
• the shaft support system also supports the signal processing electronics and the one or more sensors. A cover can then come to protect the electronic module 18. The cover can be sealed, thus ensuring 10
• the annular cover fixed on the flange 16, comes to form a narrow passage with the encoder 19 and / or the inner ring 33 of the bearing 17.
• the cover can also be provided with a friction seal.
• the manufacture of the shaft support system 7 may include the following steps.
• the flange 16 is over-molded on the outer ring 34 of the bearing 17.
• knurling can be provided on at least a portion of the cylindrical outer surface. of said outer ring 34.
• the encoder 19 is connected to the inner ring 33.
• the electronic module 18 is mounted on the flange 16, then the assembly is closed with the cover.
• the mounting of the electric motor can be performed by a small number of relatively simple operations. First, it comes to place the bearing 6 in its housing at the bottom of the housing 2. It has the stator 3 in the housing 2. It has the shaft 5 supporting the rotor 4 in the bore of the inner ring 1 1 of the bearing 6.
• the shaft support subassembly 7 is arranged and fixed in the housing
• the processing module 18 and more particularly the electronic circuits 42 may be designed to emit an output information in analog or digital form.
• the relative angular position of the poles of the encoder 19 and the sensors 20 can make it possible to detect the absolute angular position and thus to know with very high precision the position 11
• the electronic circuits 42 may be configured to emit an output information in the form of pulse width modulation.
• the output signal can thus be directly used by other external devices.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)
• Motor Or Generator Frames (AREA)
• Manufacture Of Motors, Generators (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=37310610

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (33)

Family Cites Families (8)

• 2006
  • 2006-03-15 FR FR0602256A patent/FR2898739B1/fr not_active Expired - Fee Related
• 2007
  • 2007-03-14 CN CN2007800087145A patent/CN101401280B/zh not_active Expired - Fee Related
  • 2007-03-14 JP JP2008558868A patent/JP5085568B2/ja not_active Expired - Fee Related
  • 2007-03-14 EP EP07731738A patent/EP2059993A1/fr not_active Withdrawn
  • 2007-03-14 WO PCT/FR2007/050922 patent/WO2007104894A1/fr active Application Filing
  • 2007-03-14 US US12/225,076 patent/US8258659B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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