CN106300710A - A kind of motor stator casing assembly and groove method for designing carrying out groove design based on elastic mechanics model - Google Patents

Abstract

The present invention relates to a kind of motor stator casing assembly and groove method for designing carrying out groove design based on elastic mechanics model, compared with prior art solve motor stator casing mounting structure and cannot meet the defect of actually used needs.The present invention includes stator and housing, and stator elastic conjunction is in housing, and the lateral surface of described stator is provided with groove, and groove is paralleled with the axis of stator, and groove radial direction based on stator is overlooked and is rectangle, and groove is based on stator axially to be overlooked in fan annular.The present invention designs by adding the groove filling heat-conducting glue on stator cylindrical, it is ensured that the stability of motor work and safety.

Description

A kind of based on elastic mechanics model carry out groove design motor stator casing assembly and Groove method for designing

Technical field

The present invention relates to motor in electric automobile technical field, one carries out groove based on elastic mechanics model specifically The motor stator casing assembly of design and groove method for designing.

Background technology

Under the dual-pressure of " environmental pollution " and " energy crisis ", the new-energy automobile of exploitation energy-conserving and environment-protective has become works as The developing direction that modern World Auto Industry is following.Motor, as the key components and parts of new-energy automobile, is to promote new-energy automobile One of core technology of development.

In current New energy automobile motor, stator housing unit relies primarily on the magnitude of interference to carry out assembling fixing thus transmit torsion Square, concretely comprises the following steps and first makes it expand housing heating, then stator is pressed into housing, treats that stator housing unit is cooled to room Temperature, is fastened by the magnitude of interference of stator with housing contact surface.When motor normally works, by between stator and housing Static friction offsets the reaction torque of rotor.

This assembling structure and mode have the disadvantage that

1, stator is low with housing fitting surface heat conductivity, and radiating effect is poor；2, stator and housing fitting surface pass through the magnitude of interference Mutually crimp, is easily generated gap, reduces the stability of assembling between fitting surface；3, stator and housing carry out elastic conjunction, Have impact on the circularity of structure, add the noise and vibration of motor；4, under the conditions of extremely cold, housing contract on cooling, now housing It is pressed further by deformation with stator fitting surface in pole purgation with drugs of cold nature, easily makes housing be split up.

The most how to design a kind of new assembling structure and ensure that the stability of motor work and safety have become as urgency Need to solve the technical problem that.

Summary of the invention

The invention aims to solve motor stator casing mounting structure in prior art and cannot meet actually used The defect needed, it is provided that a kind of motor stator casing assembly and groove design side carrying out groove design based on elastic mechanics model Method solves the problems referred to above.

To achieve these goals, technical scheme is as follows:

A kind of motor stator casing assembly carrying out groove design based on elastic mechanics model, including stator and housing, fixed Sub-elastic conjunction in housing,

The lateral surface of described stator is provided with groove, and groove is paralleled with the axis of stator, groove radial direction based on stator Vertical view is rectangle, and groove is based on stator axially to be overlooked in fan annular.

The quantity of described groove is several, and several grooves are arranged in circumference in equal parts on the lateral surface of stator.

The quantity of described groove is more than 3, and the degree of depth of groove is 1/10th of the stator arc length between adjacent grooves.

Heat-conducting glue all it is filled with in described groove.

A kind of groove method for designing of the motor stator casing assembly carrying out groove design based on elastic mechanics model, including Following steps:

Calculate the setting of parameter,

Setting the monolateral magnitude of interference between stator and housing contact surface as ε, housing deflection radially is ε₁, stator radial direction Deflection is ε₂, the footprint pressure that stator coordinates with housing is P, and groove number is n, and groove central angle based on stator is θ；

Calculate housing deflection ε radially₁, its computing formula is as follows:

${\mathrm{\ϵ}}_1=\frac{PR}{E_1}(\frac{R_1^2+R^2}{R_1^2-R^2}+{\mathrm{\μ}}_1),$

Wherein: E₁Elastic modelling quantity, μ for housing₁Poisson's ratio, R for housing₁It is outside stator for housing exradius, R Radius of circle, P are the footprint pressure of housing and stator；

Calculate stator deflection ε radially₂, its computing formula is as follows:

${\mathrm{\ϵ}}_2=\frac{PR}{E_2}(\frac{R^2+R_2^2}{R^2-R_2^2}-{\mathrm{\μ}}_2),$

Wherein: E₂Elastic modelling quantity, μ for stator₂Poisson's ratio, R for stator₂It is outside stator for stator inner circle radius, R Radius of circle, P are the footprint pressure of housing and stator；

By housing and stator combined calculation,

Simultaneous housing deflection ε radially₁, stator deflection ε radially₂Calculate the monolateral interference that stator coordinates with housing Amount ε, its computing formula is:

ε=ε₁+ε₂；

Calculating the footprint pressure p of stator and housing, computing formula is as follows:

$p=\frac{\mathrm{\ϵ}}{R}{\[\frac{R_1^2+R^2}{(R_1^2-R^2)E_1}+\frac{R^2+R_2^2}{(R^2-R_2^2)E_2}+\frac{{\mathrm{\μ}}_1}{E_1}-\frac{{\mathrm{\μ}}_2}{E_2}\]}^{-1},$

Wherein: ε be the monolateral magnitude of interference that coordinates with housing of stator, R be the exradius of stator, E₁Springform for housing Amount, μ₁Poisson's ratio, R for housing₁For housing exradius, E₂Elastic modelling quantity, μ for stator₂Poisson's ratio, R for stator₂It is fixed Sub-inner circle radius；

The peak torque T ' that can transmit after calculating stator and housing interference fit, its computing formula is as follows:

T '=(2 π-n θ) uplR²,

Wherein: θ be the central angle that is woven on circumferential section of single groove, u be stator contact with housing confficient of static friction, L be the stator contact length axial with housing, n be groove number, R be the exradius of stator, P be housing and the contacting of stator Pressure；

Calculate groove central angle based on stator θ, utilize normally the work peak torque of lower output of motor to calculate for T recessed Groove central angle based on stator θ.

Described calculating groove central angle based on stator θ comprises the following steps:

Set and require that motor normally works the peak torque of lower output as T；

Obtain the maximum torque T ' that can transmit after stator coordinates with housing, and meet T ' >=T；

Calculating the span of central angle θ, its computing formula is as follows:

$\mathrm{\θ}\≤\frac{1}{n}\{2\mathrm{\π}-\frac{T}{ulR\mathrm{\ϵ}}\[\frac{R_1^2+R^2}{(R_1^2-R^2)E_1}+\frac{R^2+R_2^2}{(R^2-R_2^2)E_2}+\frac{{\mathrm{\μ}}_1{E}_2-{\mathrm{\μ}}_2{E}_1}{E_1{E}_2}\]\}$

Wherein, T be design require motor normally work the peak torque of lower output, ε be stator coordinate with housing monolateral The magnitude of interference, u be the confficient of static friction that contacts with housing of stator, l be the stator contact length axial with housing, n be groove number, R is the exradius of stator, E₁Elastic modelling quantity, μ for housing₁Poisson's ratio, R for housing₁For housing exradius, E₂It is fixed The elastic modelling quantity of son, μ₂Poisson's ratio, R for stator₂For stator inner circle radius.

Beneficial effect

A kind of motor stator casing assembly and groove design carrying out groove design based on elastic mechanics model of the present invention Method, compared with prior art by adding the groove design filling heat-conducting glue on stator cylindrical, it is ensured that motor works Stability and safety, and given the specific design method of groove by mechanical model, there is simple in construction, be easily achieved Feature.

It has the advantage that

1, by the design of heat-conducting glue in groove so that it possesses the heat conductivility of excellence, it is possible to improve stator and housing Thermal contact resistance；

2, after stator and housing elastic conjunction, contact surface mutually extrudes, and part heat-conducting glue can be extruded and enter into contact surface Gap in, increase effective contact area, consolidated the connection between stator and housing and radiating effect；

3, heat-conducting glue has good shock resistance and absorbing, is conducive to reducing the noise and vibration of motor；

4, under the conditions of extremely cold, housing shrinkage extruding stator, now groove is that certain deformation space reserved by stator, reduces Because interference fit causes the risk that housing is split up.

Accompanying drawing explanation

Fig. 1 is the radial structure schematic diagram of the present invention；

Fig. 2 is that the A-A of Fig. 1 is to structure sectional view；

Fig. 3 is the method precedence diagram of the present invention；

Wherein, 1-stator, 2-housing, 3-heat-conducting glue, 4-groove.

Detailed description of the invention

By making the architectural feature to the present invention and effect of being reached have a better understanding and awareness, in order to preferably Embodiment and accompanying drawing coordinate detailed description, are described as follows:

As depicted in figs. 1 and 2, a kind of motor stator carrying out groove design based on elastic mechanics model of the present invention Housing unit, including stator 1 and housing 2, stator 1 elastic conjunction is in housing 2.The lateral surface of stator 1 is provided with groove 4, recessed Groove 4 is groove texture, and certain deformation space reserved by the stator 2 that is designed as of groove 4, reduce under cold climate conditions because of Interference fit causes the risk that housing 1 is split up.But stator 1 be electronic in critical component, its need to have good intensity with Bear when using with rotor engagement, it is possible to transmitting large torque.Carrying out the design of groove 4 the most on the stator 1, it needs based on bullet Property mechanical model and design, groove 4 can not careless design arrangement on the stator 1.

Meanwhile, the quantity of groove 4 can be multiple, and multiple grooves 4 are arranged in circumference in equal parts on the lateral surface of stator 1. The design that multiple grooves 4 are arranged in circumference in equal parts on the lateral surface of stator 1, is also based on the intensity of stator 1 and moment of torsion and examines Consider, such as, if two grooves 4 are adjacent the nearest on stator 1, then the adjacent of two grooves 4 the most in use occur rupture or Breakage, its reliability is substantially reduced.Equally, based on elastic mechanics model, in the design having multiple groove 4, groove 4 concrete Size also produces corresponding change.Therefore, based on elastic mechanics model, groove 4 design is paralleled with the axis of stator 1, the most recessed Groove 4 is in the axial direction of stator 1.

Groove 4 radial direction based on stator 1 is overlooked and is rectangle, as it is shown in figure 1, go to see groove from stator 1 angle radially 4, groove 4 is rectangle；Groove 4 is based on stator 1 axially to be overlooked in fan annular, as in figure 2 it is shown, from the axial angle of stator 1 Removing to see groove 4, groove 4 is in fan annular.Groove 4 is designed to rectangle at stator 1 radial angle, and it is to ensure that stator 1 exists Part residing for groove 4, the torque in the axial direction of stator 1 can keep stable, the most also makes groove 4 be easy to processing.And groove 4 Being designed to fan annular at stator 1 axial angle, it is to ensure that groove 4 can be well matched with stator 1, it is ensured that its torque, Additionally also allow for the foundation of elastic mechanics model.And it is designed to fan annular at this groove 4 at stator 1 axial angle, such as Fig. 2 institute Show, at its round dot based on stator 1, define central angle θ, can design under different torque demands according to elastic mechanics model Go out central angle θ.

Based on Saint Venant's principle, the quantity of groove 4 is in the case of more than 3, and the degree of depth of groove 4 is between adjacent grooves 4 Stator 1 arc length 1/10th, this design can be reduced the groove impact on mechanical model boundary condition, it is ensured that mechanics The accuracy that model calculates.In groove 4, be all filled with heat-conducting glue 3, heat-conducting glue 3 be advantageous in that consolidated stator and housing it Between connection and radiating effect, there is good shock resistance and absorbing, exactly because and the appropriate design of stator 1 upper groove 4, On the basis of meeting stator 1 moment of torsion needs, provide receiving space for heat-conducting glue 3.At the two ends of groove 4 can also and stator The two ends of 1 retain certain distance, i.e. groove 4 and cave in surrounding on the stator 1 structure, so can facilitate the installation of heat-conducting glue 3 With deposit.

When motor uses the assembling structure of the motor stator casing unit of the present invention, it is possible to improve stator 1 and housing 2 Thermal contact resistance, increases effective contact area, has consolidated the connection between stator 1 and housing 2, reduces the vibration of motor and makes an uproar Sound, reduces the risk causing housing 2 to be split up because of interference fit, it is ensured that the stability of motor work and safety, and structure Simply, it is easy to accomplish.

Stator housing unit is mainly by housing 2 and be positioned at the stator 1 (stator core) within housing 2 and form, based on bullet Property mechanical model, is joined by given magnitude of interference ε, motor torque T, groove number n, stator and the axially contact length of housing etc. Number, can be in the hope of single groove in the span of the central angle θ of stator 1, so that it is determined that circumference in equal parts distribution on stator 1 cylindrical The size of groove 4.As it is shown on figure 3, a kind of motor stator casing assembly carrying out groove design based on elastic mechanics model Groove method for designing, with the extended line of groove 4 peripheral boundaries through the center of circle of stator 1, region that stator 1 is contacted with housing 2 Being analyzed, it comprises the following steps:

The first step, calculates the setting of parameter, sets and calculates parameter accordingly, sets up housing 2 change radially by this step Shape amount ε₁And the relation between footprint pressure P.As in figure 2 it is shown, the monolateral magnitude of interference set between stator 1 and housing 2 contact surface as ε, housing 2 deflection radially is ε₁, stator 1 deflection radially is ε₂, the footprint pressure that stator 1 coordinates with housing 2 is P, recessed Groove number is n, and groove 4 central angle based on stator is θ.

Second step, calculates housing 2 deflection ε radially₁, this step is to set up stator 1 radial-deformation ε₂With footprint pressure Relation between P.Its computing formula is as follows:

${\mathrm{\ϵ}}_1=\frac{PR}{E_1}(\frac{R_1^2+R^2}{R_1^2-R^2}+{\mathrm{\μ}}_1),$

Wherein: E₁Elastic modelling quantity, μ for housing 2₁Poisson's ratio, R for housing 2₁It is stator 1 for housing 2 exradius, R Exradius, P be the footprint pressure of housing 2 and stator 1.

3rd step, calculates stator 1 deflection ε radially₂, its computing formula is as follows:

${\mathrm{\ϵ}}_2=\frac{PR}{E_2}(\frac{R^2+R_2^2}{R^2-R_2^2}-{\mathrm{\μ}}_2),$

Wherein: E₂Elastic modelling quantity, μ for stator 1₂Poisson's ratio, R for stator 1₂It is stator 1 for stator 1 inner circle radius, R Exradius, P be the footprint pressure of housing 2 and stator 1.

4th step, by housing 2 and stator 1 combined calculation, by Simultaneous Equations, divide out unknown parameter ε₁、ε₂, will contact Pressure P represents with known design parameter.

Simultaneous housing 2 deflection ε radially₁, stator 1 deflection ε radially₂, the monolateral interference that coordinates with housing 2 of stator 1 Amount ε, its computing formula is:

ε=ε₁+ε₂。

Calculating the footprint pressure p of stator 1 and housing 2, computing formula is as follows:

$p=\frac{\mathrm{\ϵ}}{R}{\[\frac{R_1^2+R^2}{(R_1^2-R^2)E_1}+\frac{R^2+R_2^2}{(R^2-R_2^2)E_2}+\frac{{\mathrm{\μ}}_1}{E_1}-\frac{{\mathrm{\μ}}_2}{E_2}\]}^{-1},$

Wherein: ε be the monolateral magnitude of interference that coordinates with housing 2 of stator 1, R be the exradius of stator 1, E₁Bullet for housing 2 Property modulus, μ₁Poisson's ratio, R for housing 2₁For housing 2 exradius, E₂Elastic modelling quantity, μ for stator 1₂Poisson for stator 1 Ratio, R₂For stator 1 inner circle radius.

5th step, the peak torque T ' that can transmit after calculating stator and housing interference fit, by calculating in the 4th step The footprint pressure P that obtains and known design parameter to set up stator, the peak torque that can transmit after coordinating of housing and the unknown The relation of parameter θ.

Its computing formula is as follows:

T '=(2 π-n θ) uplR²,

Wherein: θ be the central angle that is woven on circumferential section of single groove, u be stator contact with housing confficient of static friction, L be the stator contact length axial with housing, n be groove number, R be the exradius of stator 1, P be housing 2 and stator 1 Footprint pressure.

Here, establish equation based on the peak torque T ' that can transmit after stator and housing interference fit and θ, root According to peak torque T being actually needed, then may determine that the value of θ.

6th step, calculates groove 4 central angle based on stator 1 θ, according to peak torque T of design of electrical motor transmission, to ensure Premised on motor normally works, set up the relation of T ' and T, in conjunction with the relation of θ in the 5th step Yu T ', and then obtain the value model of θ Enclose.Normally the work peak torque of lower output of motor is i.e. utilized to calculate groove 4 central angle based on stator 1 θ for T.It is concrete Step is as follows:

(1) set require normally the work peak torque of lower output of motor as T, peak torque T according to electric automobile to electricity The actual requirement of machine is determined.

(2) obtain the maximum torque T ' that can transmit after stator coordinates with housing, and meet T ' >=T.Meet T ' >=T's Purpose is, the stator 1 after having carried out groove design, it to meet peak torque T that design requires, according to this requirement, really Determine the design of the concrete dimensional values of groove.

(3) calculating the span of central angle θ, its computing formula is as follows:

$\mathrm{\θ}\≤\frac{1}{n}\{2\mathrm{\π}-\frac{T}{ulR\mathrm{\ϵ}}\[\frac{R_1^2+R^2}{(R_1^2-R^2)E_1}+\frac{R^2+R_2^2}{(R^2-R_2^2)E_2}+\frac{{\mathrm{\μ}}_1{E}_2-{\mathrm{\μ}}_2{E}_1}{E_1{E}_2}\]\}$

Wherein, T is that design requires that normally the work peak torque of lower output, ε of motor is the list that stator 1 coordinates with housing 2 The limit magnitude of interference, u be the confficient of static friction that contacts with housing of stator, l be the stator contact length axial with housing, n be groove Number, R are the exradius of stator 1, E₁Elastic modelling quantity, μ for housing 2₁Poisson's ratio, R for housing 2₁For housing 2 exradius, E₂Elastic modelling quantity, μ for stator 1₂Poisson's ratio, R for stator 1₂For stator 1 inner circle radius.

As in figure 2 it is shown, after calculating central angle θ, the groove 4 arranged by circumference in equal parts, design the chi that groove 4 is concrete Very little so that after the surface of stator 1 design groove 4, it is also possible to meet the needs of actual design peak torque T.

The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described.The technology of the industry The personnel simply present invention it should be appreciated that the present invention is not restricted to the described embodiments, described in above-described embodiment and description Principle, the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, these change and Improvement both falls within the range of claimed invention.The protection domain of application claims by appending claims and Equivalent defines.

Claims (6)

1. carry out a motor stator casing assembly for groove design based on elastic mechanics model, including stator (1) and housing (2), stator (1) elastic conjunction is in housing (2), it is characterised in that:

The lateral surface of described stator (1) is provided with groove (4), and groove (4) is paralleled with the axis of stator (1), groove (4) based on The radial direction of stator (1) is overlooked and is rectangle, and groove (4) is based on stator (1) axially to be overlooked in fan annular.

A kind of motor stator casing assembly carrying out groove design based on elastic mechanics model the most according to claim 1, It is characterized in that: the quantity of described groove (4) is several, several grooves (4) on the lateral surface of stator (1) in Equal round Week arranges.

A kind of motor stator casing assembly carrying out groove design based on elastic mechanics model the most according to claim 2, It is characterized in that: the quantity of described groove (4) is more than 3, and the degree of depth of groove (4) is stator (1) arc length between adjacent grooves (4) 1/10th.

A kind of motor stator casing assembly carrying out groove design based on elastic mechanics model the most according to claim 2, It is characterized in that: in described groove (4), be all filled with heat-conducting glue (3).

A kind of motor stator casing assembly carrying out groove design based on elastic mechanics model the most according to claim 2 Groove method for designing, it is characterised in that comprise the following steps:

51) setting of parameter is calculated,

Setting the monolateral magnitude of interference between stator (1) and housing (2) contact surface as ε, housing (2) deflection radially is ε₁, stator (1) deflection radially is ε₂, the footprint pressure that stator (1) coordinates with housing (2) is P, and groove number is n, groove (4) based on The central angle of stator (1) is θ；

52) housing (2) deflection ε radially is calculated₁, its computing formula is as follows:

${\mathrm{\ϵ}}_1=\frac{PR}{E_1}(\frac{R_1^2+R^2}{R_1^2-R^2}+{\mathrm{\μ}}_1),$

Wherein: E₁Elastic modelling quantity, μ for housing (2)₁Poisson's ratio, R for housing (2)₁It is stator for housing (2) exradius, R (1) exradius, P are the footprint pressure of housing (2) and stator (1)；

53) stator (1) deflection ε radially is calculated₂, its computing formula is as follows:

${\mathrm{\ϵ}}_2=\frac{PR}{E_2}(\frac{R^2+R_2^2}{R^2-R_2^2}-{\mathrm{\μ}}_2),$

Wherein: E₂Elastic modelling quantity, μ for stator (1)₂Poisson's ratio, R for stator (1)₂It is stator for stator (1) inner circle radius, R (1) exradius, P are the footprint pressure of housing (2) and stator (1)；

54) by housing (2) and stator (1) combined calculation,

Simultaneous housing (2) deflection ε radially₁, stator (1) deflection ε radially₂Calculate what stator (1) coordinated with housing (2) Monolateral magnitude of interference ε, its computing formula is:

ε=ε₁+ε₂；

Calculating the footprint pressure p of stator (1) and housing (2), computing formula is as follows:

$p=\frac{\mathrm{\ϵ}}{R}{\[\frac{R_1^2+R^2}{(R_1^2-R^2)E_1}+\frac{R^2+R_2^2}{(R^2-R_2^2)E_2}+\frac{{\mathrm{\μ}}_1}{E_1}-\frac{{\mathrm{\μ}}_2}{E_2}\]}^{-1},$

Wherein: ε be the monolateral magnitude of interference that coordinates with housing (2) of stator (1), R be the exradius of stator (1), E₁For housing (2) Elastic modelling quantity, μ₁Poisson's ratio, R for housing (2)₁For housing (2) exradius, E₂Elastic modelling quantity, μ for stator (1)₂For The Poisson's ratio of stator (1), R₂For stator (1) inner circle radius；

55) the peak torque T ' that can transmit after calculating stator and housing interference fit, its computing formula is as follows:

T′-(2π-nθ)uplR²,

Wherein: θ be the central angle that is woven on circumferential section of single groove, u be that the confficient of static friction that contacts with housing of stator, l are The stator contact length axial with housing, n be groove number, R be the exradius of stator (1), P be housing (2) and stator (1) Footprint pressure；

56) calculate groove (4) central angle θ based on stator (1), utilize motor normally work lower output peak torque be T meter Calculate groove (4) central angle θ based on stator (1).

A kind of motor stator casing assembly carrying out groove design based on elastic mechanics model the most according to claim 5 Groove method for designing, it is characterised in that described calculating groove (4) central angle θ based on stator (1) comprises the following steps:

61) set and require that motor normally works the peak torque of lower output as T；

62) obtain the maximum torque T ' that can transmit after stator coordinates with housing, and meet T ' >=T；

63) calculating the span of central angle θ, its computing formula is as follows:

$\mathrm{\θ}\≤\frac{1}{n}\{2\mathrm{\π}-\frac{T}{ulR\mathrm{\ϵ}}\[\frac{R_1^2+R^2}{(R_1^2-R^2)E_1}+\frac{R^2+R_2^2}{(R^2-R_2^2)E_2}+\frac{{\mathrm{\μ}}_1{E}_2-{\mathrm{\μ}}_2{E}_1}{E_1{E}_2}\]\}$

Wherein, T is that design requires that normally the work peak torque of lower output, ε of motor is the list that stator (1) coordinates with housing (2) The limit magnitude of interference, u be the confficient of static friction that contacts with housing of stator, l be the stator contact length axial with housing, n be groove Number, R are the exradius of stator (1), E₁Elastic modelling quantity, μ for housing (2)₁Poisson's ratio, R for housing (2)₁For housing (2) Exradius, E₂Elastic modelling quantity, μ for stator (1)₂Poisson's ratio, R for stator (1)₂For stator (1) inner circle radius.