CN109462298B - Miniature low-voltage driving motor for electric automobile - Google Patents

Miniature low-voltage driving motor for electric automobile Download PDF

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Publication number
CN109462298B
CN109462298B CN201811212810.8A CN201811212810A CN109462298B CN 109462298 B CN109462298 B CN 109462298B CN 201811212810 A CN201811212810 A CN 201811212810A CN 109462298 B CN109462298 B CN 109462298B
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China
Prior art keywords
magnetic steel
end cover
trapezoidal
iron boron
neodymium iron
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CN201811212810.8A
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Chinese (zh)
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CN109462298A (en
Inventor
谢百年
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Zhejiang Dakeer Automotive Electronics Technology Co Ltd
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Zhejiang Dakeer Automotive Electronics Technology Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/16Stator cores with slots for windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K11/00Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28Layout of windings or of connections between windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

Abstract

The invention relates to a miniature low-voltage driving motor for an electric automobile, which is designed for mainly solving the technical problems of smaller power and poor electromagnetic force effect of a stator core of the existing products with the same specification. The main point is that one end of the rotating shaft of the driving motor is sleeved in a rotor of the rotary transformer, a bearing of the rotating shaft at the end is arranged on a rear end cover, and the rear end cover is sleeved in a stator of the rotary transformer; the stator core adopts eighteen punching sheet slots which are uniformly distributed, and the stator winding adopts three groups of star connection modes which are connected in parallel for winding; two magnetic steel groove groups which are symmetrically arranged in a V shape are arranged in the rotor core, the six magnetic steel groove groups are uniformly distributed by taking the rotating shaft as the center, neodymium iron boron magnetic steel is respectively embedded in the middle of the magnetic steel grooves of the magnetic steel groove groups, and four groups of iron core discs of the rotor core are overlapped. The neodymium iron boron magnetic steel is a rectangular magnetic steel bar, a magnetic steel groove of the rotor core is a special-shaped through hole, the neodymium iron boron magnetic steel is arranged in the middle of the magnetic steel groove, and two sides of the magnetic steel groove are respectively provided with a trapezoidal hole and a stepped trapezoidal chamfer hole.

Description

Miniature low-voltage driving motor for electric automobile
Technical Field
The invention relates to the technical field of driving motors, in particular to a miniature low-voltage driving motor for an electric automobile.
Background
At present, with continuous exhaustion of energy, new energy automobiles become the key point of research of people, and electric automobiles as new energy automobiles are the ones which are most easy to realize mass production at present and are generally concerned by people. The driving motor is one of core technologies of an electric automobile and is always the research focus of the industry, and the current driving motor is basically a permanent magnet synchronous motor with a single output shaft and is arranged at the bottom of the electric automobile to provide power for the automobile. The driving motor of such an electric vehicle is disclosed in chinese patent application No. 201010257036.X, application publication No. 2012.03.14, entitled "brushless motor for electric vehicle"; the brushless motor comprises a shell, a rotor, a stator and a motor controller, wherein the rotor and the stator are positioned in an inner cavity of the shell; the stator comprises a stator punching sheet and a stator coil wound on the stator punching sheet, and the stator coil winding adopts a Y-shaped connection method; the brushless motor for the electric automobile comprises a converter capable of converting the connection mode of a stator coil winding and a plurality of cable lead wires, wherein the cable lead wires are led out from a plurality of positions of the stator coil, and are connected with the converter; the converter is connected with a conversion control signal output port of the motor controller. However, the above structure is still to be further improved in the aspect of the transmission of the rotating shaft, the structure of the rotor core and the structure of the stator winding.
Disclosure of Invention
The invention aims to provide a miniature low-voltage driving motor for an electric automobile with a simplified traditional motor structure for the field, and solves the technical problems that the current is smaller, the electromagnetic force is smaller, the power is smaller, the electromagnetic force action effect of a stator core is poor, and particularly the magnetic steel slot design in the existing similar products is difficult to realize the three-group combined action effect that the stator core generates three groups of electromagnetic force lines which cross two connected punching sheet slots and form one group of electromagnetic force lines. The purpose is realized by the following technical scheme.
A miniature low-voltage driving motor for an electric automobile comprises a front end cover, a bearing, a rotating shaft, a shell, a stator core, a stator winding, a rotor core, neodymium-iron-boron magnetic steel, a rear end cover and a wiring terminal, wherein the front end cover is arranged in front of the driving motor, the wiring terminal extending out of the shell is arranged on one side of the rear end cover, and the shell, the wiring terminal and the driving motor are fixedly connected into a whole; the tang of front end housing is connected with the one end of shell, and fixed stator core is emboliaed to the inner wall of shell, and stator core is inside around having stator winding, and stator core links firmly in an organic whole with the shell promptly, and stator winding is arranged to stator core's centre, and the centre of front end housing is equipped with the bearing, and the front end housing is stretched out to the one end of bearing, and the centre of bearing is equipped with the pivot, and the pivot is connected with rotor core, and the rotor core of pivot both sides is equipped with positioning pressing plate respectively, and rotor core's magnetism steel inslot centre embedding neodymium iron boron. The structure design key points are that the bearing is also arranged at the other end of the rotating shaft, the rotor of the rotary transformer is sleeved at the end part of the rotating shaft at the side, the bearing is arranged on a rear end cover, the stator of the rotary transformer is sleeved in the rear end cover, a spigot of the rear end cover is connected with the other end of the shell, and the front end cover, the shell, the rotary transformer and the rear end cover are fixedly connected into a whole through bolts. The structure is convenient for the integrated assembly forming of the driving motor, the sealing performance and the stability are good, and the replacement and the maintenance of the whole machine are convenient.
The stator core adopts eighteen punching sheet grooves to be uniformly distributed, and the stator winding is wound in a three-group parallel star connection mode. The winding mode can provide larger current so as to generate larger electromagnetic force, and is convenient to be used by matching with the rotor core with the following structure.
The rotor comprises a rotor core and is characterized in that magnetic steel grooves symmetrically arranged in a V shape are formed in the rotor core, six magnetic steel groove groups are uniformly distributed by taking a rotating shaft as a center, neodymium iron boron magnetic steel is embedded in the middle of each magnetic steel groove group, and four groups of iron core discs of the rotor core are stacked. The structure ensures that the magnetic force of the magnetic field cutting magnetic lines in the rotor core is larger, and the rotor core is matched with the assembly structure of the following neodymium iron boron magnetic steel and the magnetic steel groove.
The neodymium iron boron magnetic steel is a rectangular magnetic steel strip with a short edge smaller than a long edge and a short edge larger than one half of the long edge. The structure is the best and largest neodymium iron boron magnetic steel designed in a limited space, so that the effective magnetic action of the rotor core is ensured.
The utility model discloses a rotor core's permanent magnet motor, including rotor core, permanent magnet. The structure of the special-shaped through hole is used for fixing the neodymium iron boron magnetic steel, and meanwhile, electromagnetic force of the rectangular neodymium iron boron magnetic steel is released conveniently.
The height of every two outer trapezoidal magnetic stripe holes symmetrically arranged in a V-shaped manner in the magnetic steel grooves of the rotor core is greater than one half of the height of the inner trapezoidal magnetic stripe holes and smaller than the height of the inner trapezoidal magnetic stripe holes. The structure effectively ensures that the stator core generates three groups of combined action effects of three groups of electromagnetic force lines which are formed by crossing and connecting two punching sheet slots.
Rotor core's magnet steel groove in the neodymium iron boron magnetism steel minor face one side top border in the trapezoidal magnetic stripe hole in outside is equipped with the trapezoidal chamfer of cascaded convergent, and trapezoidal end angle height after the convergent is greater than the fourth of inboard trapezoidal magnetic stripe hole height, and trapezoidal end angle height is greater than the half of outside trapezoidal magnetic stripe hole height promptly. The structure further ensures the action effect of the three groups of electromagnetic force line groups.
And a large oil hole and a small oil hole are respectively formed above one side of the rotating shaft at the position of the magnetic steel groove group of the rotor core. The structure saves the design structure according to the magnetic action effect of the rotor core and the cost of the correspondingly designed lubricating oil.
The invention has reasonable structural design, convenient use and production, low production cost, small motor volume and large driving force; the motor is suitable for being used as a miniature low-voltage driving motor of an electric automobile and the structural improvement of the like products.
Drawings
Fig. 1 is a schematic sectional structure of the present invention.
Fig. 2 is a schematic view of a rotor structure of the present invention, in which a portion a is framed.
Fig. 3 is an enlarged view of a portion a of fig. 2.
Fig. 4 is a schematic diagram of the stator winding structure of the present invention, and the dotted line in the center of the diagram is the magnetic field acting line.
Figure number and name: 1. front end housing, 2, bearing, 3, pivot, 4, shell, 5, stator core, 6, stator winding, 7, rotor core, 701, trapezoidal chamfer, 8, neodymium iron boron magnetic steel, 9, resolver, 10, rear end housing, 11, terminal.
Detailed Description
The construction and use of the invention will now be further described with reference to the accompanying drawings. As shown in fig. 1-4, the driving motor is a micro driving motor, the motor voltage adopts the following safe voltage, and the specific structure is as follows: the front of the driving motor is provided with a front end cover 1, one side of the rear end cover is provided with a binding post 11 extending out of the shell, a spigot of the front end cover is connected with one end of the shell 4, the inner wall of the shell is sleeved with a fixed stator iron core 5, a stator winding 6 is wound inside the stator iron core, namely the stator iron core is fixedly connected with the shell into a whole, and the middle of the stator iron core is provided with the stator winding; the middle of the front end cover is provided with a bearing 2, one end of the bearing extends out of the front end cover, the middle of the bearing is provided with a rotating shaft 3, the rotating shaft is connected with a rotor core, the rotor cores on two sides of the rotating shaft are respectively provided with a positioning pressing plate, and the middle of a magnetic steel groove of the rotor core is embedded with neodymium iron boron magnetic steel 8; the other end of the rotating shaft is also provided with the bearing, the end part of the rotating shaft at the side is sleeved in the rotor of the rotary transformer 9, the bearing is arranged on the rear end cover 10, the rear end cover is sleeved in the stator of the rotary transformer, the spigot of the rear end cover is connected with the other end of the shell, and the front end cover, the shell, the rotary transformer and the rear end cover are fixedly connected into a whole through bolts.
Meanwhile, eighteen punching sheet slots are uniformly distributed on the stator core, and the stator winding is wound in a three-group parallel star connection mode. The interior of the rotor core is provided with V-shaped magnetic steel grooves which are symmetrically arranged, six magnetic steel groove groups are uniformly distributed by taking the rotating shaft as the center, neodymium iron boron magnetic steel is embedded in the middle of each magnetic steel groove group, and four groups of iron core discs of the rotor core are arranged in a stacked mode. The neodymium iron boron magnetic steel is a rectangular magnetic steel strip with a short side smaller than a long side and a short side larger than one half of the long side; two oil holes are respectively arranged above one side of the rotating shaft at the position of the magnetic steel groove group of the rotor core. The magnetic steel groove of rotor core is middle rectangle magnetic stripe hole and the communicating dysmorphism through-hole in the trapezoidal magnetic stripe hole in both sides, and neodymium iron boron magnetic steel sets up in the rectangle magnetic stripe hole in magnetic steel groove, and neodymium iron boron magnetic steel's long limit is located hypotenuse one side in trapezoidal magnetic stripe hole, and the height in trapezoidal magnetic stripe hole is greater than the long length of half of neodymium iron boron magnetic steel, and is less than neodymium iron boron magnetic steel's long length. The height of every two outer trapezoidal magnetic stripe holes symmetrically arranged in a V shape in a magnetic steel groove of the rotor core is greater than one half of the height of the inner trapezoidal magnetic stripe holes and smaller than the height of the inner trapezoidal magnetic stripe holes. The top border of the neodymium iron boron magnetism steel minor face one side of outside trapezoidal magnetic stripe hole is equipped with trapezoidal chamfer 701 of cascaded convergent in rotor core's the magnet steel groove, and trapezoidal end angle height after the convergent is greater than the fourth of inboard trapezoidal magnetic stripe hole height, and trapezoidal end angle height is greater than the half of outside trapezoidal magnetic stripe hole height promptly.
The working principle is as follows: when the driving motor is used, the three binding posts 11 are firstly connected into a three-phase circuit, so that the stator winding 6 is connected into an alternating current circuit, electromagnetic induction is generated between the stator winding and the neodymium iron boron magnetic steel 8 in the rotor core 7, magnetic lines of force are cut to enable the rotor core 7 to rotate, the rotating shaft 3 is driven to rotate, and rotating speed and force can be generated to drive an automobile to move forward. Meanwhile, as the surface of the shell of the driving motor is provided with the heat dissipation ribs, the heat generated in the electromagnetic winding 6 is properly released, and the motor runs more smoothly. The stator winding is wound in a three-group parallel star connection mode, and provides larger current compared with an equivalent winding mode, so that larger electromagnetic force is generated.
The embodiments described above are only a part of the embodiments of the present invention, and not all of the embodiments, and are intended to illustrate the technical means of the present invention, and not to limit the technical scope of the present invention. Obvious modifications or alterations to the invention in combination with the prior art knowledge will be apparent to those skilled in the art and fall within the scope of the invention.

Claims (3)

1. A miniature low-voltage driving motor for an electric automobile comprises a front end cover (1), a bearing (2), a rotating shaft (3), a shell (4), a stator core (5), a stator winding (6), a rotor core (7), neodymium iron boron magnetic steel (8), a rear end cover (10) and a wiring terminal (11), wherein the front end cover is arranged in front of the driving motor, the wiring terminal extending out of the shell is arranged on one side of the rear end cover, and the shell (4) and the wiring terminal (11) are fixedly connected with the driving motor into a whole; the front end cover is characterized in that a spigot of the front end cover is connected with one end of the shell, a fixed stator core is sleeved in the inner wall of the shell, a stator winding is wound in the stator core, namely the stator core is fixedly connected with the shell into a whole, the stator winding is arranged in the middle of the stator core, a bearing is arranged in the middle of the front end cover, one end of the bearing extends out of the front end cover, a rotating shaft is arranged in the middle of the bearing and connected with a rotor core, the rotor cores on two sides of the rotating shaft are respectively provided with a positioning pressing plate, and neodymium iron boron magnetic steel; the device is characterized in that the bearing (2) is also arranged at the other end of the rotating shaft (3), the end part of the rotating shaft at the side is sleeved in a rotor of a rotary transformer (9), the bearing is arranged on a rear end cover (10), the rear end cover is sleeved in a stator of the rotary transformer, a spigot of the rear end cover is connected with the other end of a shell (4), and a front end cover (1), the shell, the rotary transformer (9) and the rear end cover are fixedly connected into a whole through bolts; the rotor core (7) is internally provided with V-shaped symmetrically-arranged magnetic steel grooves, six magnetic steel groove groups are uniformly distributed by taking the rotating shaft (3) as the center, neodymium iron boron magnetic steel (8) is embedded in the middle of each magnetic steel groove group, and four groups of iron core discs of the rotor core are overlapped; the neodymium iron boron magnetic steel (8) is a rectangular magnetic steel strip with a short side smaller than a long side and a short side larger than one half of the long side; the magnetic steel groove of the rotor core (7) is a special-shaped through hole with a middle rectangular magnetic strip hole communicated with trapezoidal magnetic strip holes at two sides, the neodymium iron boron magnetic steel (8) is arranged in the rectangular magnetic strip hole of the magnetic steel groove, the long edge of the neodymium iron boron magnetic steel is positioned at one side of the inclined edge of the trapezoidal magnetic strip hole, and the height of the trapezoidal magnetic strip hole is greater than half of the length of the long edge of the neodymium iron boron magnetic steel and less than the length of the long edge of the neodymium iron boron magnetic steel; the heights of every two outer trapezoidal magnetic stripe holes symmetrically arranged in a V shape in the magnetic steel slots of the rotor core (7) are greater than one half of the height of the inner trapezoidal magnetic stripe holes and smaller than the height of the inner trapezoidal magnetic stripe holes; the top border of neodymium iron boron magnetism steel (8) minor face one side of the trapezoidal magnetic stripe hole in the outside among the magnet steel groove of rotor core (7) is equipped with trapezoidal chamfer (701) of cascaded convergent, and trapezoidal end angle height after the convergent is greater than the fourth of the trapezoidal magnetic stripe hole height in inboard, and trapezoidal end angle height is greater than the half of the trapezoidal magnetic stripe hole height in outside promptly.
2. The miniature low-voltage driving motor for the electric automobile according to claim 1, wherein the stator core (5) adopts eighteen punching slots for uniform layout, and the stator winding (6) adopts three groups of star connection in parallel for winding.
3. The miniature low-voltage driving motor for the electric automobile according to claim 1, wherein two oil holes are respectively arranged above the rotating shaft (3) at the magnetic steel groove group of the rotor core (7).
CN201811212810.8A 2018-10-18 2018-10-18 Miniature low-voltage driving motor for electric automobile Active CN109462298B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811212810.8A CN109462298B (en) 2018-10-18 2018-10-18 Miniature low-voltage driving motor for electric automobile

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Application Number Priority Date Filing Date Title
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CN109462298B true CN109462298B (en) 2020-02-14

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111697782A (en) * 2020-06-22 2020-09-22 深圳市吉胜华力科技有限公司 Slotless and brushless grooved drum permanent magnet synchronous motor comprising special controller and rotary transformer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102738923A (en) * 2011-03-30 2012-10-17 阿斯莫有限公司 Motor and electric pump
JP2013066339A (en) * 2011-09-20 2013-04-11 Toshiba Corp Embedded-magnet rotary electric machine
CN204316210U (en) * 2014-12-06 2015-05-06 大洋电机新动力科技有限公司 The permagnetic synchronous motor of a kind of rotor and application thereof
CN205791860U (en) * 2016-07-11 2016-12-07 江苏金坛绿能新能源科技有限公司 A kind of rotor structure for permanent magnet motor
CN206164321U (en) * 2016-09-23 2017-05-10 李祥 New forms of energy are PMSM for electric motorcycle
CN206490564U (en) * 2017-02-28 2017-09-12 大连日牵电机有限公司 Brushless hidden pole type hybrid exciting synchronous motor used for electric vehicle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102738923A (en) * 2011-03-30 2012-10-17 阿斯莫有限公司 Motor and electric pump
JP2013066339A (en) * 2011-09-20 2013-04-11 Toshiba Corp Embedded-magnet rotary electric machine
CN204316210U (en) * 2014-12-06 2015-05-06 大洋电机新动力科技有限公司 The permagnetic synchronous motor of a kind of rotor and application thereof
CN205791860U (en) * 2016-07-11 2016-12-07 江苏金坛绿能新能源科技有限公司 A kind of rotor structure for permanent magnet motor
CN206164321U (en) * 2016-09-23 2017-05-10 李祥 New forms of energy are PMSM for electric motorcycle
CN206490564U (en) * 2017-02-28 2017-09-12 大连日牵电机有限公司 Brushless hidden pole type hybrid exciting synchronous motor used for electric vehicle

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