Motor structure
Technical field
The invention relates to a kind of motor structure, particularly one magnetic-sensing balance sheet is set,, promote the motor balance structure of the assembly precision of a sensing element simultaneously for the rotary balance of keeping a rotor about a fixed part.
Background technology
The spin balancing structure of known motor rotor, announce " the radiator fan group structure of tool magnetic location " No. 383818 as TaiWan, China, No. 422365 " heat spreader structures of tool magnetic location fan group ", No. 428838 " locating structure of motor rotor " and No. 241969 novel patents such as " fan motors ", and United States Patent (USP) the 6th, 097, No. 120 " Brushless DC motor structure (Brushless D.C.Motor Assembly) ", the 6th, 727, No. 626 " motor balancing patch structure (Balancing Plate for a Motor) ", the 6th, 483, No. 209 " the gimbal structure (Balance Rings for Motors) of motor ", the 6th, 700, No. 241 " locating structure of Spindle Motor prestressed magnet (Positioning device forPrestressing Magnet of Spindle Motor) " reaches and discloses patents of invention such as " the spin balancing structures (Rotational Balance Structure forMotor) of motor " No. 2005/0006962, and it roughly comprises a fixed part, one rotor, an one magnetic portion and a magnet sensing part.This fixed part is provided with a pedestal, a central siphon, a bearing, stator group and a circuit board.This central siphon is fixed on the pedestal, and this central siphon can be installed with this bearing.This stator pack selects to use the coil and the pole piece (iron core) of axial winding-type or radial windings type.This rotor is provided with an axostylus axostyle and an annular magnet.This axostylus axostyle is plugged in this bearing, and the annular magnet of this rotor is around to the formed magnetic pole strength of pole piece that should stator pack.This magnetic portion selects to be located at the root edge of this rotor, the central siphon top of this stator pack, and perhaps this magnetic portion also can be selected from the annular magnet of this rotor itself, even is selected from the alternating magnetic field that pole piece produced of this stator pack.This magnet sensing part is to be made by iron material, and its structure can be selected from: the structures such as rotor case of the disk of tool two arc edges, the interior iron-clad of this rotor, ring segment, several knee-pieces or Spindle Motor.On relative position, this magnet sensing part be select to be fixedly arranged on this pedestal, on this circuit board, the inner surface of this rotor, the root edge of this rotor, and corresponding to this magnetic portion.
When the motor running of above-mentioned any balance structure of tool, the coil electricity of this stator pack causes each pole-face of this pole piece (or polar arm of iron core) to produce alternating magnetic field, thereby promotes this rotor rotation.During this rotor rotation, this magnet sensing part is subjected to the magnetic attraction of this magnetic portion, thereby in order to the auxiliary rotary balance of keeping this rotor, avoids this rotor axial to break away from this stator pack, and it is relative to the wearing and tearing of rotating that reduce this bearing, and then prolongation motor useful life.
Even so, but above-mentioned rotary balance is constructed in fact ubiquity following problems, for example: the sheet metal size of (1), this magnet sensing part usually as far as possible with very big area to magnet (as annular magnet) that should magnetic portion, but this measure may cause this magnet sensing part and magnetic portion that excessive balance magnetic active force is provided.(2), on the other hand, the circuit board of this fixed part is typically provided with at least one hall sensing element, and it is in the face of the annular magnet of this rotor, so that respond to the change in polarity of this annular magnet when this rotor rotation.Yet this hall sensing element usually only is fixed on this circuit board by several pins of bending, so the IC encapsulation main body of this hall sensing element inevitable warpage and not smooth on this circuit board upwards usually, therefore influences the accuracy of its assembling.Because motor structure miniaturization day by day, the assembling space of this fixed part becomes limited, so this fixed part is difficult to set up other assist location member, for this hall sensing element of precision positioning.Under the inconsistent prerequisite of groups of motors packing quality, the hall sensing element of part motor product may provide inaccurate induced signal, thereby influences the rotational efficienty of this rotor and reduce the product yield.Based on the above-mentioned various technical disadvantages of keeping rotary balance, still be necessary further to improve the spin balancing structure of above-mentioned various motor rotors really.
Summary of the invention
In view of this, the present invention improves above-mentioned shortcoming, and it is at a fixed part one magnetic-sensing balance sheet to be set, and this magnetic-sensing balance sheet has several sense magnetic surfaces in order to the annular magnet in the face of a rotor, but the body of this magnetic-sensing balance sheet voltage supply system one sensing element forms the location simultaneously.Whereby, the present invention not only provides an amount of magnetic counterbalance effect, keeping the rotor spin balancing, and also can further promote this sensing element assembling accuracy, induced signal output quality and product yield.
Main purpose of the present invention provides a kind of motor structure, wherein a fixed part is provided with a magnetic-sensing balance sheet, it has several sense magnetic surfaces, and the body that can suppress a sensing element becomes the location, make the present invention have and make sensing element certain, and an amount of sense magnetic surface and the suction magnetic effect between annular magnet are provided to the spacing of annular magnet.
The present invention is achieved in that
The invention provides a kind of motor structure, described motor structure comprises: a fixed part, and it is provided with stator group, and this stator pack has at least one coil and at least one pole piece, this pole piece extends to form several magnetic pole strengths, and this coil can be switched on and be made this magnetic pole strength produce alternating magnetic field; One rotor, it is provided with an axostylus axostyle and an annular magnet, rotating this fixed part that is incorporated into of this axostylus axostyle, this annular magnet is located in this rotor, and to magnetic pole strength that should stator pack; One magnetic-sensing balance sheet, it is located on this fixed part, and this magnetic-sensing balance sheet is provided with at least two sense magnetic surfaces, and this sense magnetic surface is toward at least one surface of the annular magnet of this rotor; And a sensing element, it is located on this fixed part; Wherein this magnetic-sensing balance sheet can be suppressed the body in this sensing element, with this sensing element of accurate location, makes sensing element certain to the spacing of annular magnet, and an amount of sense magnetic surface and the suction magnetic effect between annular magnet are provided.
Motor structure of the present invention, this fixed part is provided with a circuit board in addition, and this sensing element is to be located on this circuit board.
Motor structure of the present invention, this circuit board is provided with an opening in addition, and this sensing element is to be embedded in the opening of this circuit board.
Motor structure of the present invention, this magnetic-sensing balance sheet are the upper surfaces that is incorporated into this circuit board.
Motor structure of the present invention, this magnetic-sensing balance sheet is provided with a junction in addition, respectively feels magnetic surface to connect.
Motor structure of the present invention, the connecting portion of this magnetic-sensing balance sheet are outer connecting portions, and this sense magnetic surface is that the inner edge by this outer connecting portion extends radially inwardly and forms, and should sense magnetic surface toward the basal surface of the annular magnet of this rotor.
Motor structure of the present invention forms a breach respectively between each two adjacent sense magnetic surface, this breach and the annular magnet of sense magnetic surface while toward this rotor.
Motor structure of the present invention, the connecting portion of this magnetic-sensing balance sheet are connecting portions in, and this sense magnetic surface is that the outer rim by connecting portion in this extends radially outwardly and forms, and this feels the basal surface of magnetic surface toward the annular magnet of this rotor.
Motor structure of the present invention forms a breach respectively between each two adjacent sense magnetic surface, this breach and the annular magnet of sense magnetic surface while toward this rotor.
Motor structure of the present invention, the central authorities of the interior connecting portion of this magnetic-sensing balance sheet are provided with an axis hole, for a central siphon external diameter that is set in this fixed part.
The present invention can further promote the stable and assembling accuracy of the induced signal output quality of this sensing element and magnetic-sensing balance sheet relatively under the excitatory efficient of the alternation that does not influence this stator pack, and an amount of symmetrical magnetic counterbalance effect is provided simultaneously.
Description of drawings
Fig. 1: the exploded perspective view of the motor structure of first embodiment of the invention;
Fig. 2: the assembled sectional view of the motor structure of first embodiment of the invention;
Fig. 3: the assembled sectional view of the 3-3 line of Fig. 2 of the present invention;
Fig. 4: the exploded perspective view of the motor structure of second embodiment of the invention;
Fig. 5: the assembled sectional view of the motor structure of second embodiment of the invention;
Fig. 6: the assembled sectional view of the 6-6 line of Fig. 5 of the present invention.
Symbol description:
10 fixed parts, 11 pedestals, 12 central siphons
13 bearings, 14 stator pack, 140 magnetic pole strengths
141 pole pieces, 142 coils, 15 circuit boards
150 openings, 151 sensing elements, 20 rotors
21 axostylus axostyles, 22 wheel hubs, 23 annular magnets
30 magnetic-sensing balance sheets, 31 outer connecting portion 32 sense magnetic surfaces
Connecting portion in 33 breach, 40 magnetic-sensing balance sheets 41
411 axis holes, 42 sense magnetic surfaces, 43 breach
Embodiment
In order to allow above and other objects of the present invention, feature and advantage understand by clearer and more definite quilt, hereinafter will be especially exemplified by preferred embodiment of the present invention, and cooperate appended graphicly, be described in detail below.
Please refer to shown in Figure 1, the motor structure of first embodiment of the invention is to comprise a fixed part 10, a rotor 20 and a magnetic-sensing balance sheet 30, it can be applicable to high-tech field of motors, particularly small-sized brushless d.c. motor field such as radiator fan or spindle in optical disc drive motor.
Please refer to Figure 1 and Figure 2, the fixed part 10 of first embodiment of the invention is provided with a pedestal 11, a central siphon 12, a bearing 13, stator group 14 and a circuit board 15.This pedestal 11 is the housings (not illustrating) that can be incorporated into a motor.This central siphon 12 can be selected to make separately or be directly one-body molded on this pedestal 11.The inside of this central siphon 12 is in order to being installed with at least one this bearing 13, and external diameter is in order to wear in conjunction with this stator pack 14 and circuit board 15.This bearing 13 is optional from known bearing constructions such as oiliness bearing, ball bearing, liquid bearing or magnetic bearings.This stator pack 14 may be selected to be the stator structure of radial windings type or axial winding-type, and it is provided with several pole pieces 141 and is wound with several coils 142.This pole piece 141 radially extends to form several magnetic pole strengths 140.This circuit board 15 suitably is provided with an opening 150, for being embedded at least one sensing element 151 of assembling.The body of this sensing element 151 is to belong to an IC packaging structure (package), and it is electrically connected at the control circuit of this circuit board 15 by several bending pins.This sensing element 151 for the current lead-through direction of mutual this coil 142 of control, and then makes the magnetic pole strength 140 of this pole piece 141 produce alternating magnetic field in order to detect the rotary state of this rotor 20.
Referring again to Figure 1 and Figure 2, the rotor 20 of first embodiment of the invention comprises an axostylus axostyle 21, a wheel hub 22 and an annular magnet 23.One end of this axostylus axostyle 21 is fixed on the inner surface middle position of this wheel hub 22, and the other end of this axostylus axostyle 21 extends downwards, in the rotating bearing 13 that is inserted in this fixed part 10.This annular magnet 23 is located on the inner peripheral surface of this wheel hub 22.The inner peripheral surface of this annular magnet 23 has N, S polar region (not illustrating), and corresponding to the magnetic pole strength 140 of this stator pack 14.The alternation that this annular magnet 23 can be responded to this magnetic pole strength 140 is excitatory and rotate, and rotates to drive this rotor 20.
Referring again to Fig. 1, Fig. 2 and shown in Figure 3, the magnetic-sensing balance sheet 30 of first embodiment of the invention is a plate body in the form of a ring, it is to be made by magnetic conductivity materials such as ferrous metals, these magnetic-sensing balance sheet 30 one-body molded formation one outer connecting portions 31, several sense magnetic surface 32 and several breach 33.According to product demand, this sense magnetic surface 32 is to select inner edge by this outer connecting portion 31 to extend radially inwardly to form, or axially bends and form.33 of this breach are formed between each two adjacent sense magnetic surface 32.This magnetic-sensing balance sheet 30 is installed on this fixed part 10, and preferable selection is attached at the upper surface of this circuit board 15.When assembling, these sense magnetic surface 32 preferable selections are toward the basal surface or the inner peripheral surface of the annular magnet 23 of this rotor 20.More specifically, the sense magnetic surface 32 of this magnetic-sensing balance sheet 30 (or outer connecting portion 31) can form the location in order to suppress the body of this sensing element 151, with the improper upwards warpage of the body of avoiding this sensing element 151.
Referring again to Fig. 2 and shown in Figure 3, after motor assembling, the sense magnetic surface 32 of magnetic-sensing balance sheet 30 of the present invention is to be fixed on this fixed part 10, and toward the basal surface (or inner peripheral surface) of this annular magnet 23.When this rotor 20 rotates, these annular magnet 23 magnetic attraction should be felt magnetic surface 32, thereby produce a magnetic balanced action power, effectively avoid shake that this rotor 20 produces whereby, shake or rock, and then suitably keep the spin balancing and the rotational stability of this rotor 20.Simultaneously, by this breach 33 that right quantity is set, then help avoiding producing excessive magnetic balanced action power, between this sense magnetic surface 32 to guarantee the not rotational efficienty of this rotor 20 of excessive influence.The most important thing is that the sense magnetic surface 32 of this magnetic-sensing balance sheet 30 (or outer connecting portion 31) can be in order to suppress the body of this sensing element 151.Whereby, the body that the present invention can effectively avoid this sensing element 151 is warpage upwards improperly, with this sensing element 151 of accurate location, and make this sensing element 151 certain to the spacing of annular magnet 23, and then the stable and assembling accuracy of promotion feeling induction signal output quality.
Please refer to Fig. 4, Fig. 5 and shown in Figure 6, it discloses the motor structure of second embodiment of the invention.Compared to first embodiment, the magnetic-sensing balance sheet 40 of second embodiment is connecting portion 41 in the one-body molded formation one, several sense magnetic surface 42 and several breach 43.The central authorities position of connecting portion 41 is provided with an axis hole 411 in being somebody's turn to do, for sheathed central siphon 12 external diameters that are incorporated into this fixed part 10.According to product demand, this sense magnetic surface 42 is to select outer rim by connecting portion in this 41 to extend radially outwardly to form, or axially bends and form.This breach 43 is formed between each two adjacent sense magnetic surface 42.These magnetic-sensing balance sheet 40 preferable same selections are attached at the upper surface of this circuit board 15.Moreover when assembling, this sense magnetic surface 42 can be selected basal surface or the inner peripheral surface in the face of the annular magnet 23 of this rotor 20.More specifically, the sense magnetic surface 42 of this magnetic-sensing balance sheet 40 (or interior connecting portion 41) can form the location in order to suppress the body of this sensing element 151.
Referring again to Fig. 4, Fig. 5 and shown in Figure 6, when this rotor 20 rotates, but these annular magnet 23 same magnetic attraction should be felt magnetic surface 42, thereby produce a magnetic balanced action power, effectively avoid this rotor 20 to produce shake, shake or rock whereby, and then suitably keep the spin balancing and the rotational stability of this rotor 20.Simultaneously, by this breach 43 that right quantity is set, then help avoiding producing excessive magnetic balanced action power, between this sense magnetic surface 42 to guarantee the not rotational efficienty of this rotor 20 of excessive influence.The most important thing is that the sense magnetic surface 42 of this magnetic-sensing balance sheet 40 (or interior connecting portion 41) can form the location in order to suppress the body of this sensing element 151.Whereby, the body that the present invention can effectively avoid this sensing element 151 is warpage upwards improperly, with this sensing element 151 of accurate location, and make this sensing element 151 certain to the spacing of annular magnet 23, and then the stable and assembling accuracy of promotion feeling induction signal output quality.
As mentioned above, the excitatory efficient of magnetic pole strength of the normal excessive influence stator pack of corresponding magnetic active force that is provided by magnet sensing part and magnetic portion compared to various known motor structures, and the normal improper upwards warpage of its hall sensing element causes and touches annular magnet 23, and influence shortcomings such as assembling quality, the present invention of Fig. 3 is by at this fixed part 10 this magnetic-sensing balance sheet 30 being set, and directly utilize this magnetic-sensing balance sheet 30 to suppress the body of these sensing elements 151, form the location.Therefore, the present invention can further promote the stable and assembling accuracy of the induced signal output quality of this sensing element 151 and magnetic-sensing balance sheet 30 really relatively under the excitatory efficient of the alternation that does not influence this stator pack 14, and an amount of symmetrical magnetic counterbalance effect is provided simultaneously.