EP3235107A2 - Machine électrique - Google Patents
Machine électriqueInfo
- Publication number
- EP3235107A2 EP3235107A2 EP15823352.8A EP15823352A EP3235107A2 EP 3235107 A2 EP3235107 A2 EP 3235107A2 EP 15823352 A EP15823352 A EP 15823352A EP 3235107 A2 EP3235107 A2 EP 3235107A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- stator
- axis
- tooth
- rotation
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
- H02K1/246—Variable reluctance rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/02—Synchronous motors
- H02K19/10—Synchronous motors for multi-phase current
- H02K19/103—Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- 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
-
- 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
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
Definitions
- the present invention relates to an electric machine with variable reluctance. More particularly, the invention relates to a variable reluctance machine for application, as an electric motor, in a motor vehicle, in particular for an electric supercharger. The present invention also relates to an electric supercharger for a motor vehicle, comprising such a variable-reluctance electric motor.
- Such an electric supercharger is conventionally implemented in the air intake line of a combustion engine of a motor vehicle, upstream or downstream of a turbocharger.
- a compressor can be implemented on a recirculation line of the exhaust gas of the internal combustion engine.
- the electric supercharger conventionally comprises a wheel for compressing the air entering the compressor and an electric motor for driving the wheel in rotation.
- the electric supercharger Unlike turbochargers, driven by the exhaust gas, the electric supercharger has a very short response time because it works with an electric motor. This makes it possible to increase the torque of the internal combustion engine at low speed, to compensate the response time of the turbocharger and to improve the acceleration of the motor vehicle on which mounted the internal combustion engine equipped with the electric supercharger.
- stator delimiting an interior space
- a rotor located in the interior space and intended to rotate about an axis of rotation
- stator having opposite pairs of stator teeth relative to the axis of rotation, each stator tooth having a front face directed towards the axis of rotation, the rotor having at least one pair of opposed rotor teeth with respect to the axis of rotation, each rotor tooth having a front face directed away from the axis of rotation,
- the rotor teeth having a maximum distance from the axis of rotation, called tooth height, and being separated from each other by notches having a minimum distance from the axis of rotation, called interdental height, plus 65% of the tooth height,
- each rotor tooth having a convex transverse profile in a circle, called a rotor circle, having a center, called the rotor center.
- the front face of the stator teeth is flat and the curvature of the rotor teeth is centered on the axis of rotation.
- the air gap decreases gradually until the teeth are aligned and then increases gradually until the teeth are closed. separate. This gradual variation of the gap makes it possible to make the engine torque variations progressive.
- the object of the invention is to propose an electrical machine configuration with variable reluctance making it possible to limit sound vibrations in the audible frequency range.
- an electric machine in particular an electric motor, with variable reluctance comprising:
- stator delimiting an interior space
- a rotor located in the interior space and intended to rotate about an axis of rotation
- stator having opposite pairs of stator teeth relative to the axis of rotation, each stator tooth having a front face directed towards the axis of rotation, the rotor having at least one pair of opposed rotor teeth with respect to the axis of rotation, each rotor tooth having a front face directed away from the axis of rotation,
- the rotor teeth having a maximum distance from the axis of rotation, called the tooth height, and being separated from each other by notches having a minimum distance from the axis of rotation, called inter-tooth height, not more than 65% of the tooth height,
- each rotor tooth having a convex transverse profile in a circle, called a rotor circle, having a center, called a rotor center, characterized in that the front face of each stator tooth has a concave transverse profile in a circle, called a circle stator, having a center, called stator center,
- stator curvature and the rotor curvature it is possible to adjust both the stator curvature and the rotor curvature to adapt to the configuration of the electrical machine (dimensions, materials used, phase currents to be received, etc.), in order to reduce vibrations in the audible frequency range.
- stator circle having a radius, called the stator radius, the offset between the rotor center and the stator center is between 2% and 10% of the stator radius.
- stator teeth of the same pair are symmetrical with respect to the axis of rotation.
- the rotor teeth of the same pair are symmetrical with respect to the axis of rotation.
- each stator tooth is symmetrical with respect to an axis of symmetry passing through the axis of rotation.
- each rotor tooth is symmetrical about an axis of symmetry passing through the axis of rotation.
- the single figure is a longitudinal sectional view of a variable reluctance electric motor according to the invention.
- the electric motor 100 is an electric motor with variable reluctance.
- the electric motor 100 comprises a stator 102 comprising a frame 104 defining an interior space 106 in which extends a longitudinal axis of rotation O.
- the stator 102 further includes stator teeth 108 A ... 108 B projecting from the frame 104 towards the axis of rotation O.
- Each stator tooth 108 A ... 108 B has a front face 110 A ... 110 B directed towards the axis of rotation O.
- the stator teeth 108 A ... 108 B are distributed angularly about the axis of rotation O uniformly.
- each stator tooth 108 A ... 108 D is symmetrical with respect to a respective axis of symmetry passing through the axis of rotation O.
- stator teeth 108 A ... 108 D are grouped in pairs 108 A , 108 c and 108 B , 108 D , the two stator teeth 108 A , 108 c and 108 B , 108 D of the same pair being located opposite each other with respect to the axis of rotation O.
- the two stator teeth 08 A , 08 C and 108 B , 08 D of the same pair are symmetrical to one another. one from the other relative to the axis of rotation O.
- each stator tooth 108 A. . .108 D has a concave transverse profile in a circle, called a stator circle C s , having a center, called the stator center O s and a radius, called the stator radius R s .
- the stator radius R s is preferably the same for all the stator teeth 108 A. . .108 D.
- the electric motor 100 further includes coils (not shown) wound around each stator tooth 108 A, 108 C and 108 B, 108 D.
- the electric motor 100 further includes a rotor 110 for rotation relative to the stator 102 about the axis of rotation O.
- the rotor 110 has a central portion 112 and rotor teeth 114 A , 114 B projecting from the central portion 112 opposite the axis of rotation O.
- Each rotor tooth 114 A , 114 B has a front face 116 A , 116 B directed away from the axis of rotation O, towards the stator 102.
- the teeth 114 A , 114 B are angularly distributed around the axis of rotation O uniformly.
- each rotor tooth 114 A , 114 B is symmetrical with respect to a respective axis of symmetry passing through the axis of rotation O.
- the rotor teeth 114 A , 114 B are grouped in pairs 114 A , 114 B , the two rotor teeth 4 A , 114 B of the same pair being located opposite each other relative to each other. to the axis of rotation O.
- the two rotor teeth 4 A , 114 B of the same pair are symmetrical to each other with respect to the axis of rotation O.
- each rotor tooth 4 A , 114 B has a convex transverse profile in a circle, called a rotor circle C R , having a center, called the rotor center O r and a radius, called the rotor radius R R .
- the rotor radius R R is preferably the same for all the rotor teeth 4 A , 114 B.
- the rotor and stator centers O r O S are selected so that, when a rotor tooth 114 A, 114 B is aligned with a stator tooth 108a. . .108 D (that is to say in particular when their axes of symmetry coincide), the rotor center C R is offset from the stator center C s by an offset d towards the front face 116 A , 116 B of the rotor tooth 114 A , 114 B.
- the air gap taken radially relative to the axis of rotation O is greater on the ends of the teeth than in their centers.
- the flow magnetic increases and then decreases continuously when rotor tooth 114 A, 114g passes the vicinity of a stator tooth 108 ... 108 A D. In this way, it is possible to choose both the rotor radius R R and the stator radius R s to obtain a variation of the gap to reduce the noise of the motor in the audible frequencies (20 Hz to 20 000 kHz) .
- the rotor O r and stator centers O s is located on either side of the axis of rotation O.
- the rotor center O r could be located on the axis of rotation O.
- the stator center O s would be located opposite the rotor tooth relative to the axis of rotation. O.
- stator center O s could be located on the axis of rotation O.
- the rotor center O r would be located in the rotor tooth.
- the offset d between the rotor center C R and the stator center C s is between 2% and 10% of the stator radius R s .
- the rotor teeth 114 A , 114 B have a maximum distance from the axis of rotation O, called tooth height h max , and are separated from each other by notches having a minimum distance from the O axis of rotation, called inter-tooth height h ⁇ , worth at most 65% of the tooth height h max , and preferably at most 60%.
- the rotor teeth 4 A , 114 B are well marked which allows to direct the magnetic flux in the rotor teeth 114 A , 114 B by preventing it from passing between the teeth thanks to the inter-tooth height h ⁇ n is not too big.
- the electric motor 100 preferably comprises more pairs of stator teeth than pair (s) of rotor teeth.
- the motor has between two and six pairs of stator teeth, and very preferably three pairs of stator teeth, and four pairs of rotor teeth.
- stator 102 and the rotor 110 are made of ferromagnetic material and preferably have a maximum relative permeability greater than 10,000.
- phase current When a phase current is generated in the coil or coils of a pair of stator teeth 108 A, 108 B and 108 C, 108 D, phase current generates a magnetic field traveling in a stator tooth of the pair to each other via a pair of rotor teeth 114 a, 114 B, it applies a torque to the rotor 110 tending to align the pair of rotor teeth 114 a, 114 B with the pair of stator teeth 108 A , 108 c and 108 B , 108 D considered.
- the magnetic flux loops back through the frame 104 of the stator 102.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1462972A FR3030925B1 (fr) | 2014-12-19 | 2014-12-19 | Machine electrique |
| PCT/FR2015/053486 WO2016097565A2 (fr) | 2014-12-19 | 2015-12-14 | Machine electrique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3235107A2 true EP3235107A2 (fr) | 2017-10-25 |
Family
ID=52737265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15823352.8A Withdrawn EP3235107A2 (fr) | 2014-12-19 | 2015-12-14 | Machine électrique |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3235107A2 (fr) |
| FR (1) | FR3030925B1 (fr) |
| WO (1) | WO2016097565A2 (fr) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5239217A (en) * | 1992-05-18 | 1993-08-24 | Emerson Electric Co. | Redundant switched reluctance motor |
| JP2000152577A (ja) * | 1998-11-09 | 2000-05-30 | Toyoda Mach Works Ltd | リラクタンスモータ |
| US7923888B2 (en) * | 2006-10-19 | 2011-04-12 | Lg Electronics Inc. | Switched reluctance motor |
| KR20130042292A (ko) * | 2011-10-18 | 2013-04-26 | 삼성전기주식회사 | 스위치드 릴럭턴스 모터 |
-
2014
- 2014-12-19 FR FR1462972A patent/FR3030925B1/fr not_active Expired - Fee Related
-
2015
- 2015-12-14 WO PCT/FR2015/053486 patent/WO2016097565A2/fr not_active Ceased
- 2015-12-14 EP EP15823352.8A patent/EP3235107A2/fr not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| None * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3030925A1 (fr) | 2016-06-24 |
| WO2016097565A2 (fr) | 2016-06-23 |
| FR3030925B1 (fr) | 2018-04-13 |
| WO2016097565A3 (fr) | 2016-08-18 |
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| 18D | Application deemed to be withdrawn |
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