CN209088780U - Electric expansion valve and refrigeration system - Google Patents
Electric expansion valve and refrigeration system Download PDFInfo
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- CN209088780U CN209088780U CN201821783866.4U CN201821783866U CN209088780U CN 209088780 U CN209088780 U CN 209088780U CN 201821783866 U CN201821783866 U CN 201821783866U CN 209088780 U CN209088780 U CN 209088780U
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Abstract
A kind of electric expansion valve and refrigeration system, electric expansion valve includes stepper motor, Hall element and wiring board, Hall element and circuit board electrical connection, stepper motor includes rotor and stator, rotor includes magnetic material, stator includes coil and magnetic-conductance portion, and magnetic-conductance portion and Hall element are respectively positioned on rotor periphery；Along the extending direction of axis of rotor rotation, Hall element and wiring board are respectively positioned on the top of magnetic-conductance portion, rotor includes the first magnetic portion and the second magnetic portion, and at least partly the first magnetic portion is corresponding at least partly Hall element, and at least partly the second magnetic portion is corresponding at least partly magnetic-conductance portion；Number of magnetic poles of the number of magnetic poles of first magnetic portion less than the second magnetic portion.In this way, being conducive to improve electric expansion valve to the degree of regulation of refrigerant flow, while reducing the noise that stepper motor vibration generates, interference of the leakage field flux density of stator coil generation to Hall element is advantageously reduced.
Description
Technical field
The utility model embodiment is related to restricting element technical field more particularly to a kind of electric expansion valve and refrigeration system
System.
Background technique
To detect the problems such as stepping motor rotor whether there is stall and step-out, use is typically provided in electric expansion valve
The Hall element of rotor rotary state in detection stepper motor.Stepper motor protrudes from the rotor portion of magnetic-conductance portion in stator not
Torque is generated, is mainly used for realizing detection of the Hall element to rotor rotary state, does not protrude from the rotor portion of magnetic-conductance portion then
For generating torque under the action of coil in the stator, the switch motion of electric expansion valve is realized, and then realize electric expansion valve
Adjusting to refrigerant flow.In order to improve electric expansion valve to the degree of regulation of refrigerant flow and reduce stepper motor shake
The raw noise of movable property, the rotor that stepper motor can be more using number of magnetic poles in electric expansion valve, but the number of magnetic poles of rotor
It is smaller that amount will lead to the corresponding radial magnetic flux density of rotor more.If the rotor for protruding from magnetic-conductance portion part corresponds to Hall element suddenly
Radial magnetic flux density at your induction point is less than the action value of Hall element, and Hall element can't detect the variation in magnetic field, at this time
Rotor is practical to be had not stalled at, but Hall element can there are problems that reporting rotor stall by mistake.
In addition, the phenomenon that stepper motor is detached from magnetic-conductance portion there are the magnetic flux magnetic line of force that stator coil generates, i.e., in stator
There are magnetic flux leakages for coil.If the corresponding leakage field flux density of stator coil is greater than the action value of Hall element, Hall element meeting
Detect the leakage field of stator coil, at this time the practical stall of rotor, but Hall element can there are problems that failing to report stall.Cause
This, how increase protrude from radial magnetic flux density at the hall sensing point that the rotor portion of magnetic-conductance portion correspond to Hall element and
Difference between the corresponding leakage field flux density of stator coil, is conducive to avoid Hall element from depositing by the type selecting to Hall element
While the problem of reporting stall by mistake and failing to report stall, degree of regulation and reduction of the electric expansion valve to refrigerant flow are improved
The noise that stepper motor vibration generates becomes urgent problem to be solved.
Utility model content
In view of this, the utility model embodiment provides a kind of electric expansion valve and refrigeration system, be conducive to improve
The degree of regulation of electric expansion valve reduces the noise that stepper motor vibration generates, while advantageously reducing stator coil generation
Interference of the leakage field flux density to Hall element.
The utility model embodiment provides a kind of electric expansion valve, including stepper motor, Hall element and wiring board, institute
Hall element and the circuit board electrical connection are stated, the stepper motor includes rotor and stator, and the rotor includes magnetic material,
The stator includes coil and magnetic-conductance portion, and the magnetic-conductance portion and the Hall element are respectively positioned on the rotor periphery；
Along the extending direction of the axis of rotor rotation, the Hall element and the wiring board are respectively positioned on the magnetic-conductance portion
Top, the rotor include the first magnetic portion and the second magnetic portion, at least partly described first magnetic portion with it is at least partly described
Hall element is corresponding, and at least partly described second magnetic portion is corresponding at least partly described magnetic-conductance portion；
The number of magnetic poles of first magnetic portion is less than the number of magnetic poles of second magnetic portion.
The utility model embodiment additionally provides a kind of refrigeration system, including vaporising device, compressor, cooling device and
Electric expansion valve, the first port of the electric expansion valve, the cooling device, the compressor, the vaporising device and
Second port of the electronic expansion hair passes sequentially through connecting line and is attached, and the electric expansion valve is for adjusting by described
First port flows to the flow of the refrigerant of second port；
The electric expansion valve includes stepper motor, Hall element and wiring board, the Hall element and the wiring board
Electrical connection, the stepper motor includes rotor and stator, and the rotor includes magnetic material, and the stator includes coil and magnetic conduction
Portion, the magnetic-conductance portion and the Hall element are respectively positioned on the rotor periphery；
Along the extending direction of the axis of rotor rotation, the Hall element and the wiring board are respectively positioned on the magnetic-conductance portion
Top, the rotor include the first magnetic portion and the second magnetic portion, at least partly described first magnetic portion with it is at least partly described
Hall element is corresponding, and at least partly described second magnetic portion is corresponding at least partly described magnetic-conductance portion；
The number of magnetic poles of first magnetic portion is less than the number of magnetic poles of second magnetic portion.
The utility model embodiment provides a kind of electric expansion valve and refrigeration system, and setting electric expansion valve includes step
Into motor, Hall element and wiring board, stepper motor includes rotor and stator, and rotor includes magnetic material, and stator includes magnetic conduction
Portion, along the extending direction of axis of rotor rotation, rotor includes the first magnetic portion and the second magnetic portion, and the magnetic pole of the first magnetic portion is arranged
Quantity is corresponding at least partly Hall element less than the number of magnetic poles of the second magnetic portion, at least partly the first magnetic portion, at least portion
Divide the second magnetic portion corresponding at least partly magnetic-conductance portion, i.e., rotor is divided into two-part structure, the rotor knot relative to whole segmentation
Structure has so that the number of magnetic poles of the second magnetic portion of corresponding magnetic-conductance portion setting is not limited by the number of magnetic poles of the first magnetic portion
Conducive to the stepping angle for reducing stepper motor by the number of magnetic poles for increasing by the second magnetic portion, electric expansion valve is improved to refrigerant
The degree of regulation of flow reduces the noise that stepper motor vibration generates.Simultaneously but also the first magnetic of corresponding Hall element setting
Property portion number of magnetic poles also do not limited by the number of magnetic poles of the second magnetic portion, be conducive to by reduce the first magnetic portion magnetic pole
Quantity increases the corresponding radial magnetic flux density of the first magnetic portion, and then increases the hall sensing that the first magnetic portion corresponds to Hall element
The difference for the leakage field flux density that radial magnetic flux density and stator coil at point generate reduces the leakage magnetic flux that stator coil generates
Interference of the density to Hall element.
Detailed description of the invention
It, below will be to embodiment in order to illustrate more clearly of the technical solution in the utility model embodiment or background technique
Or attached drawing needed in background technique description does one and simply introduces, it should be apparent that, the accompanying drawings in the following description is
The schematic diagram of some embodiments of the utility model is not making the creative labor for those of ordinary skill in the art
Under the premise of, it can also be obtained according to these attached drawings other schemes.
Fig. 1 is a kind of structural schematic diagram of electric expansion valve provided by the embodiment of the utility model；
Fig. 2 is a kind of partial structurtes enlarged drawing of electric expansion valve provided by the embodiment of the utility model；
Fig. 3 is the plan structure signal of a kind of first magnetic portion and the second magnetic portion provided by the embodiment of the utility model
Figure；
Fig. 4 be a kind of first magnetic portion and the corresponding magnetic flux density of the second magnetic portion provided by the embodiment of the utility model with
The relation curve of mechanical angle；
Fig. 5 is the schematic diagram for the magnetic flux magnetic line of force that a kind of stator coil provided by the embodiment of the utility model generates；
Fig. 6 is the structural schematic diagram of another rotor provided by the embodiment of the utility model；
Fig. 7 is the structural schematic diagram of another rotor provided by the embodiment of the utility model；
Fig. 8 is a kind of structural schematic diagram of refrigeration system provided by the embodiment of the utility model.
Specific embodiment
To keep the purpose of this utility model, technical solution and advantage clearer, implement hereinafter with reference to the utility model
Attached drawing in example, clearly and completely describes the technical solution of the utility model by embodiment, it is clear that described implementation
Example is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field
Those of ordinary skill's every other embodiment obtained without making creative work, belongs to the utility model
The range of protection.
The utility model embodiment provides a kind of electric expansion valve, and electric expansion valve includes stepper motor, Hall element
And wiring board, Hall element and circuit board electrical connection, stepper motor include rotor and stator, rotor includes magnetic material, stator
Including coil and magnetic-conductance portion, magnetic-conductance portion and Hall element are respectively positioned on rotor periphery.Along the extending direction of axis of rotor rotation, Hall
Element and wiring board are respectively positioned on the top of magnetic-conductance portion, and rotor includes the first magnetic portion and the second magnetic portion, at least partly the first magnetic
Property portion is corresponding at least partly Hall element, and at least partly the second magnetic portion is corresponding at least partly magnetic-conductance portion, the first magnetic portion
Number of magnetic poles less than the second magnetic portion number of magnetic poles.
To detect the problems such as stepping motor rotor whether there is stall and step-out, use is typically provided in electric expansion valve
The Hall element of rotor rotary state in detection stepper motor.Stepper motor protrudes from the rotor portion of magnetic-conductance portion in stator not
Torque is generated, is mainly used for realizing detection of the Hall element to rotor rotary state, does not protrude from the rotor portion of magnetic-conductance portion then
For generating torque under the action of coil in the stator, the switch motion of electric expansion valve is realized, and then realize electric expansion valve
Adjusting to refrigerant flow.In order to improve electric expansion valve to the degree of regulation of refrigerant flow and reduce stepper motor shake
The raw noise of movable property, the rotor that stepper motor can be more using number of magnetic poles in electric expansion valve, but the number of magnetic poles of rotor
It is smaller that amount will lead to the corresponding radial magnetic flux density of rotor more.If the rotor for protruding from magnetic-conductance portion part corresponds to Hall element suddenly
Radial magnetic flux density at your induction point is less than the action value of Hall element, and Hall element can't detect the variation in magnetic field, at this time
Rotor is practical to be had not stalled at, but Hall element can there are problems that reporting rotor stall by mistake.
In addition, the phenomenon that stepper motor is detached from magnetic-conductance portion there are the magnetic flux magnetic line of force that stator coil generates, i.e., in stator
There are magnetic flux leakages for coil.If the corresponding leakage field flux density of stator coil is greater than the action value of Hall element, Hall element meeting
Detect the leakage field of stator coil, at this time the practical stall of rotor, but Hall element can there are problems that failing to report stall.Cause
This, how increase protrude from radial magnetic flux density at the hall sensing point that the rotor portion of magnetic-conductance portion correspond to Hall element and
Difference between the corresponding leakage field flux density of stator coil, is conducive to avoid Hall element from depositing by the type selecting to Hall element
While the problem of reporting stall by mistake and failing to report stall, degree of regulation and reduction of the electric expansion valve to refrigerant flow are improved
The noise that stepper motor vibration generates becomes urgent problem to be solved.
Electric expansion valve provided by the embodiment of the utility model includes stepper motor, Hall element and wiring board, stepping electricity
Machine includes rotor and stator, and rotor includes magnetic material, and stator includes magnetic-conductance portion, along the extending direction of axis of rotor rotation, rotor
Including the first magnetic portion and the second magnetic portion, number of magnetic poles of the number of magnetic poles less than the second magnetic portion of the first magnetic portion is set,
At least partly the first magnetic portion is corresponding at least partly Hall element, at least partly the second magnetic portion and at least partly magnetic-conductance portion pair
It answers, i.e., rotor is divided into two-part structure, relative to the rotor structure of whole segmentation, so that the second of corresponding magnetic-conductance portion setting is magnetic
The number of magnetic poles in portion is not limited by the number of magnetic poles of the first magnetic portion, is conducive to the number of magnetic poles by increasing by the second magnetic portion
To reduce the stepping angle of stepper motor, electric expansion valve is improved to the degree of regulation of refrigerant flow, reduces stepper motor vibration
The noise of generation.Simultaneously but also the number of magnetic poles of the first magnetic portion of corresponding Hall element setting is not also by the second magnetic portion
The limitation of number of magnetic poles is conducive to increase the corresponding radial flux of the first magnetic portion by the number of magnetic poles for reducing by the first magnetic portion
Density, and then increase the radial magnetic flux density that the first magnetic portion corresponds at the hall sensing point of Hall element and produced with stator coil
The difference of raw leakage field flux density reduces interference of the leakage field flux density of stator coil generation to Hall element.
It is the core concept of the utility model above, the following will be combined with the drawings in the embodiments of the present invention, to this reality
It is clearly and completely described with the technical solution in new embodiment.Based on the embodiments of the present invention, this field is general
Without making creative work, every other embodiment obtained belongs to the utility model to logical technical staff
The range of protection.
Fig. 1 is a kind of structural schematic diagram of electric expansion valve provided by the embodiment of the utility model, and Fig. 2 is the utility model
A kind of partial structurtes enlarged drawing for electric expansion valve that embodiment provides.Electric expansion valve includes stepping electricity combined with Figure 1 and Figure 2,
Machine, Hall element 1 and wiring board 100, Hall element 1 are electrically connected with wiring board 100, and stepper motor includes rotor 2 and stator 3,
Rotor 2 includes magnetic material, and stator 3 includes coil 31 and magnetic-conductance portion 32, and magnetic-conductance portion 32 and Hall element 1 are respectively positioned on outside rotor
It encloses.Along the extending direction of 2 rotation axis XX ' of rotor, Hall element 1 is respectively positioned on the top of magnetic-conductance portion 32, rotor 2 with wiring board 100
Including the first magnetic portion 21 and the second magnetic portion 22, at least partly the first magnetic portion 21 is corresponding at least partly Hall element 1, until
The second magnetic portion of small part 22 is corresponding at least partly magnetic-conductance portion 32, and the number of magnetic poles of the first magnetic portion 21 is less than the second magnetism
The number of magnetic poles in portion 22.It should be noted that Hall element 1 and wiring board 100 are respectively positioned on the top of magnetic-conductance portion 32, referred to herein as
The top of magnetic-conductance portion 32 magnetic-conductance portion 32 when being the setting of electric expansion valve direction as shown in Figure 1 top.
Fig. 3 is the plan structure signal of a kind of first magnetic portion and the second magnetic portion provided by the embodiment of the utility model
Figure.As shown in figure 3, it includes 12 magnetic poles that the first magnetic portion 21, which is illustratively arranged, that is, include 6 pairs of N magnetic poles being arranged alternately and
S magnetic pole, the second magnetic portion 22 include 24 magnetic poles, that is, include 12 pairs of N magnetic poles and S magnetic pole being arranged alternately.Fig. 4 is that this is practical new
The relation curve of the first magnetic portion of one kind and the second magnetic portion corresponding magnetic flux density and mechanical angle that type embodiment provides.Knot
Fig. 3 and Fig. 4 is closed, the abscissa in Fig. 4 indicates that the mechanical angle that rotor 2 is rotated relative to initial position, ordinate indicate rotor
2 corresponding radial magnetic flux densities during rotation, curve a are the corresponding relation curve of the first magnetic portion, and curve b is second
The corresponding relation curve of magnetic portion, it can be seen that the number of magnetic poles of magnetic portion is more, during rotation corresponding radial magnetic
Flux density is smaller.It should be noted that it includes 12 magnetic poles, the second magnetic portion that the first magnetic portion 21 is exemplarily only arranged here
22 include 24 magnetic poles, specific magnetic pole of the utility model embodiment to the first magnetic portion 21 and the second magnetic portion 22 in rotor 2
Quantity is not construed as limiting, the number of magnetic poles of the number of magnetic poles of the first magnetic portion 21 less than the second magnetic portion 22.
Fig. 5 is the schematic diagram for the magnetic flux magnetic line of force that a kind of stator coil provided by the embodiment of the utility model generates.Such as
Shown in Fig. 5, stator 3 includes coil 31 and magnetic-conductance portion 32, and the shape pair of the magnetic flux magnetic line of force generated after electric current is passed through in coil 31
The shape for the magnetic-conductance portion 32 that Ying Yu is arranged around the coil 31, as shown in upside figure in Fig. 5.When flowing through 3 coil 31 of stator
When electric current is excessive, the magnetic flux magnetic line of force that coil 31 generates can be detached from magnetic-conductance portion 32, i.e. 3 coil 31 of stator there are magnetic flux leakage,
The part for the hall sensing point 11 that the magnetic flux magnetic line of force for being detached from magnetic-conductance portion 32 corresponds to Hall element can be checked by Hall element 1,
As shown in downside figure in Fig. 5.If the corresponding leakage field flux density of 3 coil of stator 31 is greater than the action value of Hall element 1, Hall member
The action value of part is to keep the corresponding minimum magnetic flux of rotor-position detection signal generation level jump of the Hall element output close
Degree, Hall element 1 can detect the leakage field of 3 coil 31 of stator, at this time the practical stall, but 1 meeting of Hall element of rotor 2
There are problems that failing to report stall.
Specifically, in conjunction with Fig. 1 to Fig. 5, the first magnetic portion 21 of rotor 2 protrudes from the setting of magnetic-conductance portion 32 in stepper motor,
First magnetic portion 21 does not generate torque, the detection for realizing Hall element 1 to 2 rotary state of rotor, Hall element 1 and route
Plate 100 is electrically connected, and in the course of rotation, Hall element 1 detects the change in the corresponding magnetic field of the first magnetic portion 21 to the first magnetic portion 21
Change and generate corresponding electrical signal of reaction and be transmitted to 1 plate of route, microcontroller, the micro-control on wiring board 1 are provided on wiring board 1
Device processed judges that rotor 2 whether there is stall or mistake in stepper motor according to the electrical signal of reaction that the Hall element 1 received issues
The problems such as step, the extending direction along 2 rotation axis XX ' of rotor is set, Hall element 1 and wiring board 100 are respectively positioned on magnetic-conductance portion 32
Top, the electrical connection being easy to implement between Hall element 1 and wiring board 100, reduce Hall element 1 and wiring board 100 it
Between realize electrical connection cabling length.The second magnetic portion 22 of rotor 2 does not protrude from the setting of magnetic-conductance portion 32 in stepper motor, the
Two magnetic portions 22 generate torque under the action of 3 coil 31 of stator, and rotor 2 is moved axially in rotation, i.e., 2 side of rotor rotates
While moving up and down, the rotor 2 of stepper motor is fixedly connected with the screw rod of electric expansion valve, the lower end of screw rod with for adjusting electronics
The needle of the valve body aperture of expansion valve is fixedly connected, and the rotor 2 of such stepper motor drives screw rod to move up and down, and then drives valve
Needle moves up and down, and realizes the switch motion of electric expansion valve, and then realizes adjusting of the electric expansion valve to refrigerant flow.
In order to improve electric expansion valve to the degree of regulation of refrigerant flow and reduce making an uproar for stepper motor vibration generation
Sound, it is possible to reduce the stepping angle of rotor in stepper motor, i.e. stepper motor in electric expansion valve can using number of magnetic poles compared with
More rotors, but the radial magnetic compared with internal-and external diameter few pole rotor all the same, at multipolar rotoric surface same distance
Close amplitude reduces, i.e., it is smaller to will lead to the corresponding radial magnetic flux density of rotor more for the number of magnetic poles of rotor.In addition, electric expansion valve
Stepper motor in rotor generally soak in the refrigerant, to prevent refrigerant from generating harm to stator coil, for example, cause it is fixed
The insulating properties of sub- coil reduces, and stator coil can generally be isolated with refrigerant by stainless steel sleeve pipe, cause to walk in this way
Increase into the gap between the diameter of stator bore and rotor diameter of motor, the rotor portion of corresponding Hall element setting can be made corresponding
The radial magnetic flux density that the hall sensing of Hall element is pointed out further decreases.If the rotor portion pair of corresponding Hall element setting
The radial magnetic flux density at the hall sensing point of Hall element is answered to be less than the action value of Hall element, Hall element can't detect magnetic
The variation of field, rotor is practical at this time has not stalled at, but Hall element can there are problems that reporting rotor stall by mistake.
The rotor portion of corresponding Hall element setting can be increased to the distance of Hall element by reduction rotor at present
Radial magnetic flux density at the hall sensing point of corresponding Hall element, it is corresponding with the rotor portion for increasing corresponding Hall element setting
The difference of radial magnetic flux density leakage field flux density corresponding with stator coil at the hall sensing point of Hall element, but this
It needs to realize by reducing the gap between casing thickness or rotor and casing, for the limitation of technique working condition, this
Kind method is difficult to realize.The better magnetic material of magnetic property is selected to constitute alternatively, it is also possible to which rotor is arranged, but this is undoubtedly increased
The cost of electric expansion valve.Also can reduce flow through stator coil electric current it is close to reduce the corresponding leakage magnetic flux of stator coil
Degree, but can accordingly reduce the torque of stepper motor in this way, lead to step out of stepping motor, it can not accurate adjusting refrigerant flow rate.Such as
Where increase, which protrudes from the rotor portion of magnetic-conductance portion, corresponds to radial magnetic flux density and stator at the hall sensing point of Hall element
Difference between the corresponding leakage field flux density of coil is conducive to that Hall element is avoided to there is mistake by the type selecting to Hall element
Report stall and the problem of fail to report stall mentions while reducing the interference of leakage field flux density that stator coil generates to Hall element
The noise that high electric expansion valve generates the degree of regulation of refrigerant flow and reduction stepper motor vibration becomes urgently to be resolved
The problem of.
It includes stepper motor, Hall element 1 and wiring board 100, Hall that electric expansion valve, which is arranged, in the utility model embodiment
Element 1 is electrically connected with wiring board 100, and stepper motor includes rotor 2 and stator 3, and rotor 2 includes magnetic material, and stator 3 includes
Coil 31 and magnetic-conductance portion 32, magnetic-conductance portion 32 and Hall element 1 are respectively positioned on the periphery of rotor.Along the extension of 2 rotation axis XX ' of rotor
Direction, Hall element 1 and wiring board 100 are respectively positioned on the top of magnetic-conductance portion 32, are advantageously implemented Hall element 1 and wiring board 100
Electrical connection, rotor 2 includes the first magnetic portion 21 and the second magnetic portion 22, at least partly the first magnetic portion 21 at least partly
Hall element 1 is corresponding, and at least partly the second magnetic portion 22 is corresponding at least partly magnetic-conductance portion 32, and the magnetic of the first magnetic portion 21 is arranged
Number of poles divides rotor 2 for two-part structure, the rotor 2 relative to whole segmentation less than the number of magnetic poles of the second magnetic portion 22
Structure, so that the number of magnetic poles for the second magnetic portion 22 that corresponding magnetic-conductance portion 32 is arranged is not by the number of magnetic poles of the first magnetic portion 21
Limitation, be conducive to the number of magnetic poles by increasing by the second magnetic portion 22 to reduce the stepping angle of stepper motor, it is swollen to improve electronics
Swollen valve reduces the noise that stepper motor vibration generates to the degree of regulation of refrigerant flow.Simultaneously but also the first magnetic portion 21
Number of magnetic poles also do not limited by the number of magnetic poles of the second magnetic portion 22, be conducive to by reduce the first magnetic portion 21 magnetic pole
Quantity increases the corresponding radial magnetic flux density of the first magnetic portion 21, and then increases the corresponding Hall element 1 of the first magnetic portion 21 suddenly
The difference for the leakage field flux density that radial magnetic flux density and 3 coil 31 of stator at your induction point generate, is conducive to swollen to electronics
Hall element 1 in swollen valve carries out type selecting there are problems that reporting stall by mistake and fails to report stall to avoid Hall element 1, reduce stator
Interference of the leakage field flux density that coil generates to Hall element.
In conjunction with Fig. 1 to Fig. 5,11 position of hall sensing point of Hall element 1, the diameter of the first magnetic portion 21 can be set
It is greater than the leakage field flux density of coil 31, the radial flux of the action value of Hall element 1 less than the first magnetic portion 21 to magnetic flux density
Density, the action value of Hall element 1 are less than the leakage field flux density of 3 coil 31 of stator.In this way, by the rotor 2 of stepper motor
It is divided on the basis of two-part structure, 11 position of hall sensing point of Hall element 1, the radial direction of the first magnetic portion 21 is set
Magnetic flux density is greater than the leakage field flux density of coil 31, and the action value of Hall element 1 is close less than the radial flux of the first magnetic portion 21
Degree, the leakage magnetic flux that the action value of Hall element 1 is less than 3 coil 31 of stator is close, is being conducive to by increasing by the second magnetic portion 22
Number of magnetic poles to improve electric expansion valve to the degree of regulation of refrigerant flow, reduce the noise that stepper motor vibration generates
Meanwhile avoiding Hall element 1 and there are problems that reporting stall by mistake and fail to report stall, reduce the leakage field flux density that stator coil generates
Interference to Hall element.
It is integrally formed that rotor can be set combined with Figure 1 and Figure 2, by forming the first magnetic portion 21 and the to magnetizing
Two magnetic portions 22, the first magnetic portion 21 contact setting with the second magnetic portion 22, along the direction of axis of rotor rotation XX ', can be set
The length of second magnetic portion 22 is greater than the length of the first magnetic portion 21.
Fig. 6 is the structural schematic diagram of another rotor provided by the embodiment of the utility model.As shown in fig. 6, can be set
Rotor is integrally formed, by forming the first magnetic portion 21 and the second magnetic portion 22, the first magnetic portion 21 and second to magnetizing
It is end 25 of not magnetizing between magnetic portion 22, along the direction of axis of rotor rotation XX ', it is magnetic that the length of the second magnetic portion 22 is greater than first
The length in portion 21.Such as can be set along the direction of axis of rotor rotation XX ', the first magnetic portion 21 and the second magnetic portion 22 it
Between non-magnetic portion 23 is set, the first magnetic portion 21 and the second magnetic portion 22 can be effectively increased in this way along the rotation axis XX ' of rotor
The distance in direction, and then the coupling between the magnetic pole of the first magnetic portion 21 and the magnetic pole of the second magnetic portion 22 is reduced, it reduces
Interference between the magnetic field corresponding with the second magnetic portion 22 of the corresponding magnetic field of first magnetic portion 21.It should be noted that can lead to
It crosses and the first magnetic portion 21 and the second magnetic portion 22 is formed to magnetizing, rotor can also be made to form the first magnetic by other forms
Property portion 21 and the second magnetic portion 22, the utility model embodiment are not construed as limiting this.
Fig. 7 is the structural schematic diagram of another rotor provided by the embodiment of the utility model.As shown in fig. 7, can also set
Setting rotor is separate structure, and the first magnetic portion 21 is formed separately with the second magnetic portion 2, and setting electric expansion valve further includes connection knot
Structure 4, connection structure 4 support the first magnetic portion 21 and the second magnetic portion 22 to be spaced set distance.Illustratively, the company of can be set
Binding structure 4 is integrally formed, and connection structure is connect with the first magnetic portion 21 and the second magnetic portion 22 respectively, and connection structure 4 supports
First magnetic portion 21 and the second magnetic portion 22 are spaced set distance.Also it includes 41 He of first connecting portion that connection structure 4, which can be set,
Second connecting portion 42, the first connecting plate 41 are connect with the first magnetic portion 21, and second connecting portion 42 is connect with the second magnetic portion 22,
To realize that the first magnetic portion 21 is fixedly connected with the second magnetic portion 22, and support the first magnetic portion 21 and the second magnetic portion 22
It is spaced set distance, the utility model embodiment is not construed as limiting the concrete shape of connection structure, and setting connection structure 4 supports the
Set distance is same at one magnetic portion 21 and the second magnetic portion 22 interval can increase by 22 edge of the first magnetic portion 21 and the second magnetic portion
The distance in the direction rotation axis XX ' of rotor, and then reduce between the magnetic pole of the first magnetic portion 21 and the magnetic pole of the second magnetic portion 22
Coupling, reduce the interference between corresponding with the second magnetic portion 22 magnetic field in the corresponding magnetic field of the first magnetic portion 21, reduce
The use of permanent-magnet material reduces rotor cost.
It should be noted that Fig. 6 and Fig. 7 are that the first magnetic portion 21 and second provided by the embodiment of the utility model is magnetic
Portion 22 along the direction rotation axis XX ' of rotor not in contact with two examples, the utility model embodiment is to the first magnetic portion 21 and
Two magnetic portions 22 realize not in contact with concrete mode be not construed as limiting.
Illustratively, it in conjunction with Fig. 6 and Fig. 7, can be set under the direction of axis of rotor rotation XX ', the first magnetic portion 21
The distance between surface and the upper surface of the second magnetic portion 22 are more than or equal to 1mm, are less than or equal to 3mm, along the rotation axis XX ' of rotor
The distance between the upper surface of direction, the lower surface of the first magnetic portion 21 and the second magnetic portion 22 is too small to will increase the first magnetism
Interference between portion 21, magnetic field corresponding with the second magnetic portion 22, corresponding magnetic field, along the direction rotation axis XX ' of rotor, the first magnetic
Property the lower surface in the portion 21 and excessive volume that will affect electric expansion valve in the distance between upper surface of the second magnetic portion 22, it is unfavorable
In the miniaturization for realizing electric expansion valve.
As shown in Fig. 2, rotor 2 includes rotationally and axially moving, the extreme position that rotor 2 is in axial movement can be set
When, at least partly 11 face of hall sensing point of the first magnetic portion 21 and Hall element 1, i.e., during rotor 2 moves axially,
No matter rotor 2 is moved up and down to any position, the equal corresponding region A of hall sensing point 11 setting namely Hall member of Hall element 1
The hall sensing point 11 of part 1 will not effectively avoid the hall sensing point 11 of Hall element 1 from collecting the second magnetic with region B face
Property the magnetic field that generates of portion 22, cause Hall element 1 to reduce the precision of the rotary state of rotor 2 detection.Rotor can also be set
When 2 extreme position in axial movement, there is no part with 32 face of magnetic-conductance portion, i.e. rotor 2 are axial for the first magnetic portion 21
In mobile process, no matter rotor 2 is moved up and down to any position, and the first magnetic portion 21 will not be avoided with region B face
The magnetic field that first magnetic portion 21 generates influences the output torque of stepper motor.
Optionally, as shown in Fig. 2, surface and Hall element 1 that magnetic-conductance portion 3 closes on 1 side of Hall element can be set
The distance between 11 d of hall sensing point is more than or equal to 4.5mm, is less than or equal to 5mm.It can be by closing on Hall member to magnetic-conductance portion 3
The setting of the distance between 11 d of hall sensing point on the surface and Hall element 1 of 1 side of part adjusts the Hall sense of Hall element 1
It should put at 11, the size of the corresponding leakage field flux density of 3 coil of stator 31, be conducive to the number of magnetic poles by reducing by the first magnetic portion 21
Amount increases the corresponding radial magnetic flux density of the first magnetic portion 21, and then increases the Hall of the corresponding Hall element 1 of the first magnetic portion 21
The difference for the leakage field flux density that radial magnetic flux density and 3 coil 31 of stator at induction point 11 generate, reduces by 3 coil 31 of stator
Interference of the leakage field flux density of generation to Hall element 1.It is also possible to by closing on 1 side of Hall element to magnetic-conductance portion 3
The setting of the distance between 11 d of hall sensing point of surface and Hall element 1, avoids rotor 2 from being in the limit position of axial movement
When setting, the hall sensing point 11 and region B face of Hall element 1, the hall sensing point 11 of Hall element 1 collect the second magnetic
Property the magnetic field that generates of portion 22, the problem of causing Hall element 1 to reduce the precision of the rotary state of rotor 2 detection.
It is alternatively possible to which the number of magnetic poles that the second magnetic portion 22 is arranged is more than or equal to 4, be conducive to the step for reducing stepper motor
Into angle, electric expansion valve is improved to the degree of regulation of refrigerant flow, reduces the noise that stepper motor vibration generates.It can be set
The ratio between number of magnetic poles of the number of magnetic poles of first magnetic portion 21 and the second magnetic portion 22 is more than or equal to 0.25, is less than or equal to 0.75,
If the ratio between the number of magnetic poles of the first magnetic portion 21 and the number of magnetic poles of the second magnetic portion 22 are too small, it is easy to cause the first magnetic portion
The very few Hall element that influences of 21 number of magnetic poles is to the detection accuracy of rotor-position.If the number of magnetic poles of the first magnetic portion 21 and the
The ratio between the number of magnetic poles of two magnetic portions 22 is excessive, is unfavorable for increasing by the first magnetism by the number of magnetic poles for reducing by the first magnetic portion 21
The corresponding radial magnetic flux density in portion 21, and then the diameter at the hall sensing point 11 of the corresponding Hall element 1 of the first magnetic portion 21 of increase
The difference of the leakage field flux density generated to magnetic flux density and 3 coil 31 of stator, it is close to reduce the leakage magnetic flux that stator coil 31 generates
Spend the interference to Hall element 1.
It includes stepper motor, Hall element and wiring board, Hall element that electric expansion valve, which is arranged, in the utility model embodiment
It is electrically connected with stepper motor, stepper motor includes rotor and stator, and rotor includes magnetic material, and stator includes magnetic-conductance portion, and edge turns
The extending direction of sub- rotation axis, rotor include the first magnetic portion and the second magnetic portion, and the number of magnetic poles that the first magnetic portion is arranged is small
In the number of magnetic poles of the second magnetic portion, at least partly the first magnetic portion is corresponding at least partly Hall element, and at least partly second
Magnetic portion is corresponding at least partly magnetic-conductance portion, i.e., rotor is divided into two-part structure, relative to the rotor structure of whole segmentation, so that
The number of magnetic poles of second magnetic portion of corresponding magnetic-conductance portion setting is not limited by the number of magnetic poles of the first magnetic portion, is conducive to pass through
Increase the number of magnetic poles of the second magnetic portion to reduce the stepping angle of stepper motor, improves electric expansion valve to the tune of refrigerant flow
Precision is saved, the noise that stepper motor vibration generates is reduced.Simultaneously but also the magnetic of the first magnetic portion of corresponding Hall element setting
Number of poles is not also limited by the number of magnetic poles of the second magnetic portion, is conducive to increase by the number of magnetic poles for reducing by the first magnetic portion
The corresponding radial magnetic flux density of first magnetic portion, and then increase by the first magnetic portion and correspond to the diameter at the hall sensing point of Hall element
The difference of the leakage field flux density generated to magnetic flux density and stator coil reduces the leakage field flux density of stator coil generation to suddenly
The interference of your element.
The utility model embodiment additionally provides a kind of refrigeration system, and Fig. 8 is one kind provided by the embodiment of the utility model
The structural schematic diagram of refrigeration system.As shown in figure 8, refrigeration system includes vaporising device 5, compressor 6, cooling device 8 and electricity
Sub- expansion valve, the first port 81 of electric expansion valve, cooling device 5, compressor 6, vaporising device 7 and electronic expansion hair the
Two ports 82 pass sequentially through connecting line and are attached, and electric expansion valve flows to the second port 82 by the first port 81 for adjusting
Refrigerant flow.Electric expansion valve includes stepper motor, Hall element 1 and wiring board 100, Hall element 1 and wiring board
100 electrical connections, stepper motor include rotor 2 and stator 3, and rotor 2 includes magnetic material, and stator 3 includes coil 31 and magnetic-conductance portion
32, magnetic-conductance portion 32 and Hall element 1 are respectively positioned on rotor periphery.Along the extending direction of 2 rotation axis of rotor, Hall element 1 and line
Road plate 100 is respectively positioned on the top of magnetic-conductance portion 32, and rotor 2 includes the first magnetic portion 21 and the second magnetic portion 22, and at least partly first
Magnetic portion 21 is corresponding at least partly Hall element 1, and at least partly the second magnetic portion 22 is corresponding at least partly magnetic-conductance portion 32,
Number of magnetic poles of the number of magnetic poles of first magnetic portion 21 less than the second magnetic portion 22.
The first magnetic portion 21 of rotor 2 protrudes from the setting of magnetic-conductance portion 32 in stepper motor, and the first magnetic portion 21, which does not generate, to be turned
Square judges that the detection of 2 rotary state of rotor, rotor 2 is asked with the presence or absence of stall in stepper motor for realizing Hall element 1
Topic.The second magnetic portion 22 of rotor 2 does not protrude from the setting of magnetic-conductance portion 32 in stepper motor, and the second magnetic portion 22 is in 3 middle line of stator
Torque is generated under the action of circle 31, rotor 2 is moved axially in rotation, i.e., rotor 2 is moved up and down in rotation, stepper motor
Rotor 2 is fixedly connected with the screw rod 51 of electric expansion valve, and screw rod 51 is rotated relative to nut 52 under the drive of rotor 2 and realized
It moves up and down, the lower end of screw rod 51 is fixedly connected with the needle of the valve body aperture for adjusting electric expansion valve, such stepping electricity
The rotor 2 of machine drives screw rod to move up and down, and then needle is driven to move up and down, and realizes the switch motion of electric expansion valve, in turn
Realize adjusting of the electric expansion valve to refrigerant flow.Since stepping motor rotor is equally arranged in electric expansion valve in refrigeration system
The number of magnetic poles of 2 the first magnetic portion 21 therefore also has above-described embodiment stepping less than the number of magnetic poles of the second magnetic portion 22
The beneficial effect of the control system of motor, which is not described herein again.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment here, is able to carry out for a person skilled in the art various apparent
Variation is readjusted and is substituted without departing from the protection scope of the utility model.Therefore, although by above embodiments to this
Utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from this reality
It can also include more other equivalent embodiments in the case where with novel design, and the scope of the utility model is by appended power
Sharp claimed range determines.
Claims (11)
1. a kind of electric expansion valve, which is characterized in that including stepper motor, Hall element and wiring board, the Hall element with
The circuit board electrical connection, the stepper motor include rotor and stator, and the rotor includes magnetic material, and the stator includes
Coil and magnetic-conductance portion, the magnetic-conductance portion and the Hall element are respectively positioned on the rotor periphery；
Along the extending direction of the axis of rotor rotation, the Hall element is respectively positioned on the upper of the magnetic-conductance portion with the wiring board
Side, the rotor include the first magnetic portion and the second magnetic portion, at least partly described first magnetic portion at least partly it is described suddenly
Your element is corresponding, and at least partly described second magnetic portion is corresponding at least partly described magnetic-conductance portion；
The number of magnetic poles of first magnetic portion is less than the number of magnetic poles of second magnetic portion.
2. electric expansion valve according to claim 1, which is characterized in that the hall sensing point institute of the Hall element is in place
It sets, the radial magnetic flux density of first magnetic portion is greater than the leakage field flux density of the coil, the action value of the Hall element
Less than the radial magnetic flux density of first magnetic portion, the leakage magnetic flux that the action value of the Hall element is greater than the coil is close
Degree.
3. electric expansion valve according to claim 1 or 2, which is characterized in that the rotor is integrally formed, by described
Magnetizing forms first magnetic portion and second magnetic portion, first magnetic portion and second magnetic portion contact
Setting；
Along the direction of the axis of rotor rotation, the length of second magnetic portion is greater than the length of first magnetic portion.
4. electric expansion valve according to claim 1 or 2, which is characterized in that the rotor is integrally formed, by described
Magnetizing forms first magnetic portion and second magnetic portion, between first magnetic portion and second magnetic portion
For end of not magnetizing；
Along the direction of the axis of rotor rotation, the length of second magnetic portion is greater than the length of first magnetic portion.
5. electric expansion valve according to claim 1 or 2, which is characterized in that the rotor be separate structure, described first
Magnetic portion and second magnetic portion are formed separately, and the electric expansion valve further includes connection structure, the connection structure support
First magnetic portion and second magnetic portion interval set distance；
The connection structure is integrally formed, and the connection structure is separately connected first magnetic portion and second magnetic portion；
Alternatively,
The connection structure includes first connecting portion and second connecting portion, and the first connecting portion connects first magnetic portion,
The second connecting portion connects second magnetic portion.
6. electric expansion valve according to claim 4, which is characterized in that along the direction of the axis of rotor rotation, described
The distance between the lower surface of one magnetic portion and the upper surface of the second magnetic portion are more than or equal to 1mm, are less than or equal to 3mm.
7. electric expansion valve according to claim 5, which is characterized in that along the direction of the axis of rotor rotation, described
The distance between the lower surface of one magnetic portion and the upper surface of the second magnetic portion are more than or equal to 1mm, are less than or equal to 3mm.
8. according to claim 1 or 2 or 6 or 7 described in any item electric expansion valves, which is characterized in that the rotor includes turning
Dynamic and axial movement, when the rotor is in the extreme position of the axial movement, at least partly described first magnetic portion and institute
The hall sensing point face of Hall element is stated, there is no the parts with the magnetic-conductance portion face for first magnetic portion.
9. electric expansion valve according to claim 1, which is characterized in that the magnetic-conductance portion closes on the Hall element side
Surface and the distance between the hall sensing point of the Hall element be more than or equal to 4.5mm, be less than or equal to 5mm.
10. electric expansion valve according to claim 1, which is characterized in that the number of magnetic poles of second magnetic portion is greater than
Equal to 4, the ratio between number of magnetic poles of the number of magnetic poles of first magnetic portion and second magnetic portion is more than or equal to 0.25, is less than
Equal to 0.75.
11. a kind of refrigeration system, which is characterized in that including vaporising device, compressor, cooling device and electric expansion valve, institute
State the first port, the cooling device, the compressor, the vaporising device and the electronic expansion hair of electric expansion valve
The second port pass sequentially through connecting line and be attached, the electric expansion valve flows to institute by first port for adjusting
State the flow of the refrigerant of the second port；
The electric expansion valve includes stepper motor, Hall element and wiring board, and the Hall element is electrically connected with the wiring board
It connecing, the stepper motor includes rotor and stator, and the rotor includes magnetic material, and the stator includes coil and magnetic-conductance portion,
Along the direction perpendicular to the axis of rotor rotation, the magnetic-conductance portion and the Hall element are respectively positioned on the rotor periphery；
Along the extending direction of the axis of rotor rotation, the Hall element is respectively positioned on the upper of the magnetic-conductance portion with the wiring board
Side, the rotor include the first magnetic portion and the second magnetic portion, at least partly described first magnetic portion at least partly it is described suddenly
Your element is corresponding, and at least partly described second magnetic portion is corresponding at least partly described magnetic-conductance portion；
The number of magnetic poles of first magnetic portion is less than the number of magnetic poles of second magnetic portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821783866.4U CN209088780U (en) | 2018-10-31 | 2018-10-31 | Electric expansion valve and refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821783866.4U CN209088780U (en) | 2018-10-31 | 2018-10-31 | Electric expansion valve and refrigeration system |
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| Publication Number | Publication Date |
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| CN209088780U true CN209088780U (en) | 2019-07-09 |
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| CN (1) | CN209088780U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113545686A (en) * | 2020-04-24 | 2021-10-26 | 杭州九阳小家电有限公司 | Control method of food processing machine |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113545686A (en) * | 2020-04-24 | 2021-10-26 | 杭州九阳小家电有限公司 | Control method of food processing machine |
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