EP4128490A1 - Moteur électrique à courant continu sans balais - Google Patents
Moteur électrique à courant continu sans balaisInfo
- Publication number
- EP4128490A1 EP4128490A1 EP21715238.8A EP21715238A EP4128490A1 EP 4128490 A1 EP4128490 A1 EP 4128490A1 EP 21715238 A EP21715238 A EP 21715238A EP 4128490 A1 EP4128490 A1 EP 4128490A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- electric motor
- sensor
- permanent magnets
- stator
- 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.)
- Pending
Links
Classifications
-
- 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
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
- H02K11/012—Shields associated with rotating parts, e.g. rotor cores or rotary shafts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Definitions
- the invention relates to the field of brushless direct current electric motors.
- Electric motors are already known in the state of the art, comprising a rotor integral with a drive shaft and a stator which surrounds the rotor with the presence of an air gap.
- the rotor comprises for example a body formed by a stack of metal sheets held in the form of a bundle by means of a suitable fixing system.
- the rotor has poles formed for example by permanent magnets housed in cavities formed in the magnetic mass of the rotor.
- the stator comprises for example a body formed by a stack of thin sheets forming a ring, the inner face of which is provided with notches open inwardly to receive phase windings.
- the phase windings are obtained for example from one or more electrically conductive wires or from conductive elements in the form of pins connected together, for example by welding.
- the electric motor is a "brushless” type motor, in other words brushless direct current, or otherwise known as a self-piloted synchronous motor with permanent magnets, it is necessary to know the angular position of the rotor. in order to control the operation of the motor.
- a Hall effect sensor which detects the passage of a magnetic target, such as a permanent magnet, arranged at one end of the drive shaft of the electric motor. or on a bearing ring linked to the rotor.
- the magnetic target is for example used to limit the parasitic effect of magnetic losses from the rotor as well as magnetic losses from the stator.
- Document WO2020001904A1 teaches for example the use of a Hall effect sensor for detecting the angular position of the rotor of a brushless electric motor, in which the Hall effect sensor is in particular associated with a magnetic target placed on the rotor.
- some electric motors incorporate transmission functions such as, for example, a freewheel function. In such electric motors, there is a difficulty in determining the angular position of the drive shaft which does not always correspond to the angular position of the rotor due to the freewheel.
- the object of the invention is in particular to measure the angular position of the rotor in a simple and reliable manner.
- the invention relates to a brushless direct current electric motor, in particular for an electric mobility device, comprising:
- stator comprising an electromagnetic excitation winding delimiting an internal radius of the stator
- At least one sensor configured to detect the angular position of the rotor, such as:
- said at least one sensor is arranged at an axial distance of at most 10 mm from the permanent magnets
- At least one sensor is arranged at a radius greater or less than 20 mm at most than the internal radius of the stator.
- the sensor can use the magnetic fields of leakage between the poles of the rotor in order to measure its angular position, by limiting the parasitic effect of the magnetic field of the stator winding on the sensor.
- the specific positioning of the sensor makes it possible to obtain low noise measurement signals that can be used for an electric motor control unit.
- the invention makes it possible to have a motor without a magnetic target. By avoiding the use of a specific magnetic target associated with the sensor, the number of functional elements of the electric motor is reduced, which reduces its size, weight and cost.
- the sensor can be a Hall effect sensor, or any other sensor known to those skilled in the art capable of performing the function.
- the motor according to the invention is for example mounted on an electrically assisted bicycle. It can also be installed in other electrically assisted vehicles, especially those which require human training in addition to electric drive, in particular via a crankset.
- circumferential it is preferably understood around the axis of the rotor.
- axial it is preferably understood in an axial direction parallel to the axis of rotation of the rotor.
- radial it is preferably understood in a radial direction perpendicular to the axis of rotation of the rotor.
- internal stator radius it is preferably understood the radius of the cylinder delimited by the radially internal end of the electromagnetic excitation coil of the stator.
- the rotor may have salient poles.
- the rotor comprises, for example, a stack of metal sheets held together in the form of a bundle.
- the electric motor comprises in particular a drive shaft driven by the rotor.
- a drive shaft driven by the rotor can be integrated more easily into a transmission assembly.
- the rotor can drive the drive shaft via a freewheeling element.
- the driving of the drive shaft by the rotor by means of a freewheeling element makes it possible to limit the mechanical losses when the electrical machine is not supplied with power. This is particularly the case for electric mobility devices such as electrically assisted bicycles, on descents or for example when the electric machine is not powered because that the speed of the mobility device has exceeded a certain limit, for example 25 km / h.
- the stator electromagnetic excitation coil is in particular formed by a plurality of electromagnetic excitation coils distributed circumferentially within the stator.
- the stator electromagnetic excitation winding is in particular configured to operate in three-phase mode.
- Said at least one sensor is for example arranged at a radius equal to or less than 20 mm at most, preferably less between 9 and 13 mm, more preferably less than 11.3 mm, than the internal radius of the stator. Thanks to this specific spatial positioning, the sensor emits a signal that is even less noisy and therefore more usable.
- Said at least one sensor may be arranged at a radius greater than 10 mm greater than the internal radius of the stator.
- Said at least one sensor is for example arranged at an axial distance between 3 mm and 7 mm, preferably equal to 6.1 mm, relative to the permanent magnets. Thanks to this specific spatial positioning, the sensor emits a signal that is even less noisy and therefore more usable.
- the sensitivity of said at least one sensor is in particular chosen between 15 mV / mT and 50 mV / mT, preferably between 20 mV / mT and 30 mV / mT, more preferably equal to 25 mV / mT.
- the electric motor may include at least two circumferentially offset sensors, preferably three circumferentially offset sensors, configured to detect the angular position of the rotor. Because the sensors are circumferentially offset, the signals from the sensors are offset from one another. Thus, this makes it possible to detect the poles of the rotor and to easily and precisely deduce an angular position of the rotor. Thus, the detection of the angular position of the rotor is improved and more precise.
- At least some of the permanent magnets are for example arranged, in cross section to the axis of rotation of the rotor, in I radially outwards of the rotor.
- the magnetic leakage fields from these permanent magnets are more easily detected by a sensor, in particular a Hall effect sensor.
- the detection of the angular position by said at least one sensor is facilitated.
- the permanent magnets are for example arranged so as to form, in cross section to the axis of rotation of the rotor, Us oriented radially outwardly of the rotor, each U being formed by three permanent magnets, two permanent magnets being arranged in an I radially towards the outside of the rotor so as to form the wings of the U, a third permanent magnet being arranged so as to form the core of the U.
- detection by the sensor is further improved.
- the magnets forming the cores of the U reinforce the effect of the magnetic field of the rotor on the sensor.
- the rotor has, for example, two side plates, arranged axially on either side of the rotor, which hold the permanent magnets axially in position.
- the permanent magnets are held in position in a simple manner.
- At least the side plate closest to said at least one sensor may have a thickness of between 1 mm and 5 mm.
- the positioning of the at least one sensor is not influenced by the thickness of the lateral flange located on its side.
- At least the side plate closest to said at least one sensor is for example made of a non-magnetic material.
- the side shields do not influence or disturb the magnetic fields from the poles of the rotor.
- the efficiency of the motor is not affected and moreover the detection of the rotor poles by said at least one sensor is not influenced.
- the electric motor may include a radial ring forming a magnetic shield, which is disposed axially at the level of said at least one sensor and radially between the electromagnetic excitation coil of the stator and said at least one Hall effect sensor.
- the magnetic leakage fields from the stator are at least partially absorbed by the radial ring forming the magnetic shield. This facilitates the detection of the magnetic leakage fields emanating from the rotor by said at least one Hall effect sensor. Therefore, the detection of the angular position of the rotor is improved.
- the radial ring can be made of a magnetic metallic material, preferably steel.
- the magnetic fields from the electromagnetic excitation coil of the stator are locally concentrated within the radial ring and do not flow radially towards said at least one sensor.
- the radial ring forming a magnetic shield is in particular supported by the lateral flange closest to said at least one sensor.
- the mounting of the radial ring is particularly simple, and the assembly of the electric motor is simplified.
- the assembly formed by the radial ring forming a magnetic shield and the lateral flange supporting the radial ring forming a magnetic shield may include ventilation and / or rotor balancing compensation elements.
- the assembly formed by the radial ring forming the magnetic shield and the side flange combines several functions, which reduces the size of the rotor.
- the subject of the invention is also an electric mobility device, preferably an electrically assisted bicycle, comprising an electric motor of the aforementioned type.
- FIG. 1 is a schematic top view of part of an electrically assisted bicycle comprising a brushless direct current electric motor according to a first embodiment
- FIG. 2 is a schematic sectional view of a brushless direct current electric motor according to the first embodiment
- - Figure 3 is a schematic perspective sectional view of part of the electric motor according to the first embodiment
- FIG. 4 is an exploded schematic view of a detail of the electric motor according to the first embodiment
- FIG. 5 is a schematic sectional view of part of the electric motor according to the first embodiment
- FIG. 6 is a schematic sectional view of part of the electric motor according to the first embodiment
- FIG. 7 is a schematic perspective view of part of the electric motor according to the first embodiment
- FIG. 8 is a schematic perspective view of part of the electric motor according to a variant of the first embodiment
- FIG. 9 is a schematic sectional view of a brushless direct current electric motor according to a second embodiment
- FIG. 10 is a schematic perspective sectional view of part of the electric motor according to the second embodiment.
- FIG. 1 very schematically shows by way of example an electrically assisted bicycle 53 provided with a brushless direct current electric motor 1 which will be detailed later with reference to the other figures.
- the electric motor 1 drives a reduction gear 55 and forms a transmission therewith.
- the drive output of this assembly is connected to the input of a gearbox 57.
- the electrically assisted bicycle 53 also includes a crankset 59. provided with two pedals 61 and a plate 63 in the form of a pinion, which drives a rear wheel 65 of the electrically assisted bicycle 53 by means of a chain 67 and a pinion 69 disposed on the rear wheel.
- the output of the gearbox 57 is connected to the crankset, and for example forms the axis of the crankset 59.
- the output of the electric motor - reducer assembly is connected to the output of a gearbox.
- the brushless direct current electric motor 1 as mentioned above is for example arranged on an electric mobility device, preferably an electrically assisted bicycle 53, but it can also be mounted in other electrically assisted vehicles. , in particular those which require in addition to the electric drive a human training, in particular via a crankset.
- FIG. 2 represents an example of a brushless direct current electric motor 1 according to a first embodiment.
- the electric motor 1 comprises a stator 3, a rotor 5 with permanent magnets, a drive shaft 7 driven by the rotor 5, and at least one sensor 9 configured to detect the angular position of the rotor 5.
- the electric motor 1 comprises of preferably at least two circumferentially offset sensors 9, more preferably three circumferentially offset sensors 9, configured to detect the angular position of the rotor.
- the electric motor 1 comprises three sensors 9 circumferentially offset, configured to detect the angular position of the rotor 5 (see in particular FIG. 4).
- the sensors 9 are Hall effect sensors.
- the stator 3 comprises a body 10 carrying an electromagnetic excitation coil 11 delimiting an internal radius r1 of stator 3 (see FIG. 6).
- the electromagnetic excitation winding 11 of the stator 3 is for example configured to operate in three-phase mode, without this example being limiting. In one variant, the number of phases is different, in particular greater, the winding electromagnetic excitation of the stator operating in another example in six-phase mode.
- the electromagnetic excitation winding 11 is formed by a plurality of electromagnetic excitation coils 13 - also called phase windings - distributed circumferentially within the stator 3.
- the rotor 5 is arranged within the stator 3.
- the rotor 5 is for example with salient poles. As shown in FIG.
- the rotor 5 comprises a plurality of permanent magnets 15, 17.
- the rotor 5 also comprises a stack of sheets of sheet metal held together in the form of a pack of sheets 19.
- the pack of sheets 19 comprises cavities in which the permanent magnets 15, 17 are arranged.
- the rotor 5 further comprises two lateral flanges 21, 23, arranged axially on either side of the rotor 3, which axially hold the permanent magnets 15, 17 in position, and hold the packet of sheets 19. This holding in position is for example achieved by means of fixing elements axially passing through the rotor 5, such as a set of screws 25 and nuts 27.
- the two side flanges 21, 23 have a thickness between 1 mm and 5 mm, and are made of a non-magnetic material.
- the rotor 5 is carried by the drive shaft 7 by means of a freewheel member 33, a ball bearing 31 as well as a needle cage 35 and a spacer 29. At least a radially outer part of the spacer 29 is clamped on the sheet metal pack 19.
- the ball bearing 31, the freewheel member 33 and the needle cage 35 are for example mounted tight on the spacer 29.
- the permanent magnets 15, 17 of the rotor 5 are in particular circumferentially distributed within the rotor 5 around an axis of rotation A1 of the rotor 5. At least some of the permanent magnets 15 are arranged in cross section to the axis of rotation A1 of rotor 5, in I radially outwardly of rotor 5.
- the permanent magnets 15, 17 are arranged so as to form, in section transverse to the axis of rotation A1 of the rotor 5, Us oriented radially outwardly of the rotor 5, each U being formed by three permanent magnets, two permanent magnets 15 being arranged in I radially outwardly of the rotor 5 of so as to form the wings of the U, a third permanent magnet 17 being arranged so as to form the core of the U.
- all the permanent magnets 15 of the rotor 3 are arranged, in cross section to the axis of rotation A1 of rotor 5, at I radially outwardly of rotor 5.
- the sensors 9 are arranged in receiving housings 47 formed on a sensor holder 49.
- the sensor holder 49 is supported by the second casing 39 and has a generally annular shape comprising a radial projection. 51 for supporting the sensors 9.
- the sensors 9 are arranged at an axial distance d1 of at most 10 mm with respect to the permanent magnets 15, 17. More precisely, the sensors 9 are arranged at an axial distance between 3 mm and 7 mm, preferably equal to 6.1 mm, with respect to the permanent magnets 15, 17.
- the sensors 9 are arranged at a radius greater or less than 20 mm above the radius internal stator r1. The internal radius r1 of the stator is visible in FIG.
- the sensors 9 are arranged at a radius greater than 10 mm greater than the internal radius. r1 of the stator, or are arranged at a radius equal to or less than 20 mm, preferably less between 9 and 13 mm, more preferably less than 11.3 mm, than the internal radius r1 of the stator. In the example shown in particular in Figure 6, the sensors 9 are arranged at a radius of 11.3 mm less than the internal radius r1 of the stator. In addition, the sensors 9 are for example arranged at a radius r2 equal to 21, 75 mm relative to the axis A1 of the rotor 5.
- the sensors 9, in particular Hall effect sensors have for example a sensitivity of between 15 mV / mT and 50 mV / mT, preferably between 20 mV / mT and 30 mV / mT, more preferably equal to 25 mV / mT .
- the Hall effect sensors are of the MLX90290LUA-AA-511-SP type marketed by the company Melexis (registered trademark), which has a sensitivity equal to 25 mV / mT when it is supplied at a voltage of 5V.
- the electric motor comprises a first casing 37 and a second casing 39.
- the first casing 37 and the second casing 39 are fixed together.
- the first casing 37 supports the stator 3, the stator 3 thus being integral with the first casing 37.
- the drive shaft 7 is positioned relative to the first casing 37, for example by means of a double row ball bearing 41 arranged on a pinion 43 carried by one end of the drive shaft 7.
- the drive shaft 7 is also positioned relative to the second housing 39, for example by means of a ball bearing 45 disposed on the other end drive shaft 7.
- FIGS. 9 and 10 represent an example of a brushless direct current electric motor 1 ′ according to a second embodiment.
- This differs from the electric motor 1 of the first embodiment in that it comprises a radial ring 71 forming a magnetic shield.
- the radial ring 71 forming a magnetic shield is disposed axially at the level of said at least one sensor 9, in the example illustrated at the level of the three sensors 9.
- the radial ring 71 forming a magnetic shield is disposed radially between the electromagnetic excitation winding 11 of the stator 3 and said at least one sensor 9, in the example illustrated the three sensors 9.
- the radial ring 71 is composed of a magnetic metallic material.
- the radial ring 71 is made of steel.
- the radial ring 71 forming a magnetic shield is supported by the lateral flange 23 closest to said at least one sensor 9, in the illustrated example of the three sensors 9.
- the assembly formed by the radial ring 71 forming a magnetic shield and the lateral flange 23 supporting the radial ring 71 forming a magnetic shield comprises elements for ventilation and / or balancing compensation of the rotor 5.
- the examples illustrated are only that. as an indication without limiting the invention.
- the sensors can be Hall effect sensors, as in the embodiments shown, or any other sensor capable of performing the desired function.
- electromagnetic excitation coil 13 electromagnetic excitation coil 15: permanent magnet
- crankcase 39 first crankcase 39: second crankcase 41: double row ball bearing 43: pinion 45: ball bearing 47: receiving housing 49: sensor holder
- radial ring r1 internal radius of the stator r2: radius d1: axial distance A1: axis of rotation of the rotor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Brushless Motors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2003017A FR3108808B1 (fr) | 2020-03-27 | 2020-03-27 | Moteur électrique à courant continu sans balais |
| PCT/EP2021/058014 WO2021191445A1 (fr) | 2020-03-27 | 2021-03-26 | Moteur électrique à courant continu sans balais |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4128490A1 true EP4128490A1 (fr) | 2023-02-08 |
Family
ID=70457058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21715238.8A Pending EP4128490A1 (fr) | 2020-03-27 | 2021-03-26 | Moteur électrique à courant continu sans balais |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4128490A1 (fr) |
| FR (1) | FR3108808B1 (fr) |
| WO (1) | WO2021191445A1 (fr) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5864192A (en) * | 1992-07-09 | 1999-01-26 | Seiko Epson Corporation | Brushless motor with magnetic sensor to detect leaked magnetic flux |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4142707C1 (en) * | 1991-12-21 | 1993-01-21 | Skf Textilmaschinen-Komponenten Gmbh, 7000 Stuttgart, De | Single motor drive for spindle in spinning machines giving easy measurement - has rotation position detector consisting of magnet whose auxiliary field generates pulse in Hall sensor |
| US6020660A (en) * | 1997-12-10 | 2000-02-01 | General Electric Company | Dynamoelectric machine |
| DE202011002402U1 (de) * | 2011-02-04 | 2012-05-07 | Dr. Fritz Faulhaber Gmbh & Co. Kg | Elektrischer Kleinstmotor |
| US20140091649A1 (en) * | 2012-10-02 | 2014-04-03 | Remy Technologies, Llc | Electromagnetic interference shield and balance ring for electrical machine |
| JP2015015872A (ja) * | 2013-07-08 | 2015-01-22 | ヤマハ発動機株式会社 | 回転電気機械及び鞍乗型車両 |
| DE102016214838A1 (de) * | 2016-08-10 | 2018-02-15 | BSH Hausgeräte GmbH | Ermitteln einer Drehrichtung eines Läufers einer rotierenden elektrischen Maschine |
| EP3567704B1 (fr) * | 2017-01-04 | 2022-05-18 | LG Innotek Co., Ltd. | Moteur et transmission |
| FR3083402B1 (fr) | 2018-06-29 | 2020-06-19 | Valeo Systemes D'essuyage | Moteur electrique a courant continu sans balai et procede de commande associe |
-
2020
- 2020-03-27 FR FR2003017A patent/FR3108808B1/fr active Active
-
2021
- 2021-03-26 WO PCT/EP2021/058014 patent/WO2021191445A1/fr not_active Ceased
- 2021-03-26 EP EP21715238.8A patent/EP4128490A1/fr active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5864192A (en) * | 1992-07-09 | 1999-01-26 | Seiko Epson Corporation | Brushless motor with magnetic sensor to detect leaked magnetic flux |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3108808A1 (fr) | 2021-10-01 |
| FR3108808B1 (fr) | 2023-06-23 |
| WO2021191445A1 (fr) | 2021-09-30 |
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