CN203039505U - Fan motor - Google Patents
Fan motor Download PDFInfo
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- CN203039505U CN203039505U CN 201220679089 CN201220679089U CN203039505U CN 203039505 U CN203039505 U CN 203039505U CN 201220679089 CN201220679089 CN 201220679089 CN 201220679089 U CN201220679089 U CN 201220679089U CN 203039505 U CN203039505 U CN 203039505U
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- fan motor
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- dynamic pressure
- switch element
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Abstract
The utility model discloses a fan motor, which comprises a dynamic pressure bearing mechanism arranged between a static part and a rotating part. With the dynamic pressure bearing mechanism, the vibration generated by the fan motor during the driving is reduced. The fan motor further comprises a driving control mechanism for controlling and driving the rotating part to rotate. The driving control mechanism includes a driving signal providing unit for providing a driving signal and a switch device for performing switch operation according to the driving signal. While the fan motor is in a non-driving state or the rotating part rotates backward, the driving signal providing unit outputs a brake signal for generating a magnetic field for resisting the backward rotation of the rotating part to a coil. In this way, the backward rotation of impellers is inhibited. As the backward rotation of impellers is inhibited, the damages on the dynamic pressure bearing mechanism caused by the leakage of lubricating fluid are inhibited.
Description
Technical field
The utility model relates to a kind of fan motor.
Background technology
In the past, in electronic equipments such as computer, be equipped with for inner colded fan motor.If fan motor is driven, then produce air-flow in the inside of the housing that constitutes electronic equipment.Thus, the heat that suppresses the inside of housing is accumulated.And most electronic equipments stop fan motor when not needing to cool off, and only when needs cool off, fan motor are driven.The structure of fan motor in the past for example, is disclosed in day disclosure communique 2009-213225 communique.
When the driving that makes fan motor stops, if the exhaust side of fan motor is bigger than the pressure of suction side, then produce the pressure of desiring to make the impeller counter-rotating at fan motor.For example when electronic equipment is equipped with a plurality of fan motors and wherein a part of fan motor is driven, be in fan motor in stopping near, probably can produce above-mentioned situation.
And the bearing of fan motor in the past mainly uses ball bearing.Yet in recent years, the requirement of the vibration when wanting further to reduce the fan motor driving improves constantly.In order to satisfy this requirement, for example, consider to utilize hydrodynamic pressure bearing as the bearing of fan motor.
Hydrodynamic pressure bearing has by lubricating fluid makes the bearing surface of stationary part side and the opposed structure of bearing surface of rotating part side.And, be provided with the dynamic pressure groove that makes lubricating fluid generation dynamic pressure at the bearing surface of stationary part side or rotating part side.When stable state drove, the dynamic pressure that produces by lubricating fluid suppressed lubricating fluid and spills to the outside.Yet as mentioned above, when the fan motor counter-rotating, the flow direction of lubricating fluid changes, and consequently, has produced the danger that lubricating fluid leaks from hydrodynamic pressure bearing.And because dynamic pressure disperses, the bearing surface of stationary part side might contact with the bearing surface of rotating part side.
The utility model content
The purpose of this utility model provide a kind of can reduce fans drive the time vibration and can prevent the fan motor of the damage of Bearning mechanism.
The illustrative first aspect of the application is a kind of fan motor, it comprises stationary part, rotating part, dynamic pressure bearing mechanism and driving controlling organization, wherein, described rotating part is supported for and can rotates by described stationary part, described dynamic pressure bearing mechanism is between described stationary part and described rotating part, the rotation that described driving controlling organization is controlled described rotating part drives, described stationary part has coil, described rotating part has magnet and impeller, described magnet and described coil are opposed, described rotating part drives to a direction rotation when stable state drives, described dynamic pressure bearing mechanism comprises the stationary axle bearing surface, rotating shaft bearing surface and lubricating fluid, described stationary axle bearing surface is arranged at described stationary part side, described rotating shaft bearing surface is arranged at described rotating part side, described lubricating fluid is between described stationary axle bearing surface and described rotating shaft bearing surface, at least one side in described stationary axle bearing surface and described rotating shaft bearing surface is provided with dynamic pressure groove row, when described rotating part rotates to a described direction, described dynamic pressure groove row produce towards the dynamic pressure away from the direction of liquid level described lubricating fluid, described driving controlling organization has the signal of driving provides portion and switch element, the described driving signal portion of providing provides the driving signal, thereby carrying out switch motion according to described driving signal, described switch element provides drive current to described coil, when non-driving or during described rotating part counter-rotating, described driving signal provides portion to described coil output brake signal, and this brake signal is for generation of the magnetic field of the counter-rotating of the described rotating part of opposing.
The illustrative second aspect of the application relates to the fan motor of the illustrative first aspect of above-mentioned the application, wherein, constitutes closed circuit at described driving controlling organization, and this closed circuit makes the both ends short circuit of described coil by described switch element.
The illustrative third aspect of the application relates to the fan motor of the illustrative second aspect of above-mentioned the application, wherein, described switch element is for switching the element of connection status and off-state according to the potential difference between source electrode and grid, described source electrode and voltage are connected according to the part that the induced electromotive force of described coil changes, and described grid and voltage are not connected according to the part that the induced electromotive force of described coil changes.
The illustrative fourth aspect of the application relates to the fan motor of the illustrative third aspect of above-mentioned the application, and wherein, described fan motor also has cut-out portion, and this cut-out portion is used for cut-out and flows to the electric current that described driving signal provides portion's side from described closed-loop path.
Illustrative the 5th aspect of the application relates to the fan motor of the illustrative second aspect of above-mentioned the application, wherein, described switch element is for switching the element of connection status and off-state according to the potential difference between source electrode and grid, when described fan motor did not drive, it was the voltage of connection status that described driving signal provides portion that described grid is provided for making described switch element.
Illustrative the 6th aspect of the application relates to the fan motor of the illustrative first aspect of above-mentioned the application, wherein, when described fan motor did not drive, described driving controlling organization provided the fixed magnetic field electric current that flows along specific direction continuously or intermittently by described switch element to described coil.
Illustrative the 7th aspect of the application relates to the fan motor of illustrative the 6th aspect of above-mentioned the application, wherein, described stationary part has a plurality of coils corresponding with each phase place of three-phase the two poles of the earth or three-phase full-wave, when described fan motor did not drive, described driving controlling organization provided described fixed magnetic field electric current to the coil corresponding with at least one phase place.
The illustrative eight aspect of the application relates to the fan motor of illustrative the 7th aspect of above-mentioned the application, and wherein, the quantity of establishing described coil is s, and the number of poles of described magnet is m, and this moment, s/3=m/2 set up.
Illustrative the 9th aspect of the application relates to the fan motor of the either side in illustrative the 6th aspect to the eight aspect of above-mentioned the application, and wherein, described driving controlling organization flows to horizontal pulse width modulated or electric current restriction to described fixed magnetic field electricity consumption.
Illustrative the tenth aspect of the application relates to the fan motor of the either side in illustrative first aspect to the eight aspect of above-mentioned the application, wherein, described dynamic pressure bearing mechanism has continuous bag shape gap between described stationary axle bearing surface and described rotating shaft bearing surface, the described lubricating fluid that remains on described gap has single liquid level.
The application the illustrative the tenth relates in one aspect to the fan motor of illustrative the tenth aspect of above-mentioned the application, wherein, described stationary part also has the sleeve part cylindraceous of the radially inner side that is disposed at described coil, described rotating part also has axle and endless member, described axle is inserted in the inboard of described sleeve part, described endless member is fixed in described axle and has axial end face with described sleeve part in axial opposed circumferentia, described dynamic pressure bearing mechanism has journal bearing portion and cod portion, described journal bearing portion constitutes by the outer peripheral face of the inner peripheral surface of described sleeve part and described axle and between the two lubricating fluid, and described cod portion constitutes by the described circumferentia of the axial end face of described sleeve part and described endless member and between the lubricating fluid between the two.
Illustrative the 12 aspect of the application relates to above-mentioned the application the illustrative the tenth fan motor on the one hand, and wherein, the liquid level of described lubricating fluid is between the inner peripheral surface of described sleeve part and described outer peripheral face.
Illustrative the 13 aspect of the application relates to above-mentioned the application the illustrative the tenth fan motor on the one hand, wherein, described endless member has the cylindrical portion of the radial outside that is positioned at described sleeve part, and the liquid level of described lubricating fluid is between the inner peripheral surface of the outer peripheral face of described sleeve part and described cylindrical portion.
According to the illustrative utility model of the application, by using dynamic pressure bearing mechanism, the vibration in the time of can reducing the fan motor driving.And, owing to can suppress the counter-rotating of impeller, therefore can suppress because the damage of the dynamic pressure bearing mechanism that the leakage of lubricating fluid etc. cause.
Description of drawings
Fig. 1 is the longitudinal section of the related fan motor of first execution mode.
Fig. 2 is the general profile chart of the related electronic equipment of second execution mode.
Fig. 3 is the longitudinal section of the related fan motor of second execution mode.
Fig. 4 is the sectional elevation of the related fan motor of second execution mode.
Fig. 5 is the longitudinal section of the related dynamic pressure bearing mechanism of second execution mode.
Fig. 6 is the longitudinal section of the related sleeve of second execution mode.
Fig. 7 is the upward view of the related sleeve of second execution mode.
Fig. 8 is the vertical view of the related cap of second execution mode.
Fig. 9 is the figure of the structure of the related circuit of expression second execution mode.
Figure 10 is the figure of the structure of the related circuit of expression variation.
Figure 11 is the longitudinal section of the related fan motor of variation.
Embodiment
Followingly with reference to accompanying drawing the illustrative execution mode of the utility model is described.In addition, in this application, will be called " axially " along the direction of the central axis of fan motor, will be called " radially " with the direction of the central axis quadrature of fan motor, will be called " circumferentially " along the direction of the circular arc centered by the central axis of fan motor.And, in this application, with an axial side be " on ", opposite side is that D score comes the shape of each one and position relation are described.Yet, this just for convenience of description and definition about, do not limit the related fan motor of the utility model direction in use.
＜1. first execution mode 〉
Fig. 1 is the longitudinal section of the related fan motor 1A of first execution mode of the present utility model.As shown in Figure 1, fan motor 1A comprises stationary part 2A, rotating part 3A, dynamic pressure bearing mechanism 5A and drives controlling organization 4A.
Dynamic pressure bearing mechanism 5A is between stationary part 2A and rotating part 3A.Thus, rotating part 3A is supported for respect to stationary part 2A and can rotates.And stationary part 2A has coil 62A.Rotating part 3A have impeller 35A and with the opposed magnet 37A of coil 62A.Rotating part 3A drives to a direction rotation when stable state drives.
Dynamic pressure bearing mechanism 5A has the stationary axle bearing surface 221A that is arranged on stationary part 2A side and is arranged at the rotating shaft bearing surface 312A of rotating part 3A side.And dynamic pressure bearing mechanism 5A has the lubricating fluid 50A between stationary axle bearing surface 221A and rotating shaft bearing surface 312A.
And, in the example of Fig. 1, be provided with dynamic pressure groove row 313A at rotating shaft bearing surface 312A.At rotating part 3A during to above-mentioned direction rotation, dynamic pressure groove row 313A makes lubricating fluid 50A produce dynamic pressure to produce towards the liquid stream away from the direction of liquid level 51A.Compare the vibration when using dynamic pressure bearing mechanism 5A can reduce fan motor 1A driving with the situation of the Bearning mechanism that uses other modes such as ball bearing or sliding bearing.In addition, at least one side in stationary axle bearing surface 221A and rotating shaft bearing surface 312A arranges dynamic pressure groove row and gets final product.
The rotation that drives controlling organization 4A control rotating part 3A drives.Driving controlling organization 4A has the signal of driving provides the 49A of portion and switch element 80A.Driving signal provides the 49A of portion to provide the driving signal to switch element 80A.Thereby carrying out switch motion according to the driving signal, switch element 80A provides drive current to coil 62A.
And in described fan motor 1A, when non-driving or rotating part counter-rotating, driving signal provides the 49A of portion to coil 62A output brake signal.Make coil 62A produce the magnetic field of the counter-rotating of opposing rotating part 3A by brake signal.Thus, can suppress the counter-rotating of impeller 35A.Therefore, can suppress because the damage of the dynamic pressure bearing mechanism 5 that the leakage of lubricating fluid 50A etc. cause.
＜2. second execution mode 〉
Next, second execution mode of the present utility model is described.
＜2-1. is about having the electronic equipment of fan motor 〉
The fan motor 1 of present embodiment is equipped in the electronic equipment 10 such as computer, is used for inner cooling.Fig. 2 is the general profile chart that has carried the electronic equipment 10 of fan motor 1.As shown in Figure 2, electronic equipment 10 has housing 11.Internal configurations at housing 11 has the various parts 12 that become pyrotoxin.And, be provided with gas suction inlet 13 at the sidepiece of housing 11.And, in the example of Fig. 2, dispose four fan motors 1 at gas suction inlet 13.
The fan motor 1 of present embodiment is for producing the axial flow type fan of air-flow vertically.Electronic equipment 10 is controlled four fan motors 1 respectively according to housing 11 temperature inside.If each fan motor 1 is driven, then gas is inhaled into the inside of housing 11 from the outside of housing 11.Thus, the parts 12 that can suppress the inside of housing 11 excessively heat up.
At this, suppose such situation: in four fan motors 1, three fan motors 1 are driven, a remaining fan motor 1 is stopped.For example just can realize fully that with three fan motors 1 required cooling or a fan motor 1 are in the medium situation of maintenance and are just meeting such situation.Under this situation, owing to suck gas, the pressure rises of the inside of housing 11 by three fan motors 1.So, from the private side of housing 11 impeller of a remaining fan motor 1 is produced pressure.This pressure is to desire to make this fan motor 1 towards the pressure of the direction rotation opposite with common direction of rotation.
Yet the fan motor 1 in the present embodiment has the function that suppresses the impeller counter-rotating.Therefore, even under above-mentioned condition, also can suppress to be in the counter-rotating of the impeller of a fan motor 1 in stopping.If the counter-rotating of impeller is suppressed, then gas leaks this situation by the fan motor 1 in stopping to the outside of housing 11 and also is suppressed.Therefore, can improve the cooling effectiveness of electronic equipment 10.Details about the function that suppresses the impeller counter-rotating will be narrated hereinafter.
The structure of＜2-2 fan motor 〉
Fig. 3 is the longitudinal section of the related fan motor of present embodiment 1.As shown in Figure 3, fan motor 1 has stationary part 2 and rotating part 3.Stationary part 2 is fixed in the housing 11 of described electronic equipment 10.Rotating part 3 is supported for respect to stationary part 2 and can rotates.
Stationary part 2 in the present embodiment has casing 21, sleeve 22, cap 23 and stator unit 24.
In the present embodiment, sleeve 22 is the roughly sleeve part cylindraceous that extends vertically.Sleeve 22 is fixed in the inner peripheral surface of the inboard cylinder portion 212 of casing 21.Cap 23 is roughly discoideus parts that the opening of the bottom of sleeve 22 is stopped up.Roughly be inserted with axle 31 described later in the inboard of cup cylindraceous portion at the end that has that is formed by sleeve 22 and cap 23.The material of sleeve 22 and cap 23 for example uses metals such as stainless steel or phosphor bronze.
Fig. 4 is the sectional elevation of the part beyond the side tube part 211 except the fan motor 1.As shown in Figure 4, the stator core in the present embodiment 61 has nine teeth 612.Nine teeth 612 comprise each each corresponding three tooth 612 that drives U phase, V phase and the W phase of (three-phase full-wave driving) respectively with three-phase the two poles of the earth.And coil 62 is installed on this nine teeth 612 respectively.
Return Fig. 3.Rotating part 3 in the present embodiment comprises axle 31, following endless member 32, goes up endless member 33, rotor retainer 34, impeller 35, yoke 36 and a plurality of magnet 37.
Following endless member 32 is the circle shape part that is fixed in the bottom of axle 31.Following endless member 32 is disposed between the upper surface of the lower surface of sleeve 22 and cap 23.Last endless member 33 is the circular parts that are fixed in the head 311 of axle 31.Last endless member 33 is disposed at the top of sleeve 22.
And described fan motor 1 has circuit board 4.In the present embodiment, circuit board 4 is configured in the top of basal part 213 and the below of stator unit 24.That is, circuit board 4 in axial arrangement between basal part 213 and stator unit 24.Yet circuit board 4 is configurable position at other also.Circuit board 4 constitutes the driving controlling organization of the rotation driving of control rotating part 3.Be equipped with circuit 40 described later at circuit board 4.The lead of drawing from coil 62 is electrically connected with the part of this circuit 40.
If provide drive current by circuit board 4 to coil 62, then the tooth 612 at stator core 61 produces magnetic flux.And, by the flux interaction between tooth 612 and the magnet 37, produce circumferential torque.Consequently, rotating part 3 rotates centered by central axis 9 with respect to stationary part 2.In this fan motor 1, when stable state drove, rotating part 3 rotated to a direction.And produce air-flow vertically by the rotation of impeller 35.
＜2-3. is about dynamic pressure bearing mechanism 〉
Fig. 5 is the longitudinal section of sleeve 22, cap 23, axle 31 and following endless member 32.As shown in Figure 5, between sleeve 22 and cap 23 and axle 31 and following endless member 32, have lubricating fluid 50.Lubricating fluid 50 uses for example polyol-ester type oil or di esters oil.In the present embodiment, sleeve 22, cap 23, axle 31, following endless member 32 and lubricating fluid 50 constitute dynamic pressure bearing mechanisms 5.Rotating part 3 is supported for respect to stationary part 2 and can rotates by dynamic pressure bearing mechanism 5.
Fig. 6 is the longitudinal section of sleeve 22.As shown in Figure 6, be provided with lambdoid radial dynamic pressure groove row 222 in top and the bottom of the inner peripheral surface 221 of sleeve 22.When fan motor 1 stable state drove, axle 31 rotated to a direction with respect to sleeve 22.At this moment, make the lubricating fluid 50 between sleeve 22 and axle 31 produce dynamic pressure by radial dynamic pressure groove row 222.By this dynamic pressure, the axle 31 with respect to sleeve 22 radially supported.That is, in the present embodiment, by as the inner peripheral surface 221 of the sleeve 22 of stationary axle bearing surface, constitute journal bearing portion as the outer peripheral face 312 of the axle 31 of rotating shaft bearing surface and between the lubricating fluid 50 between the two.
Fig. 7 is the upward view of sleeve 22.As shown in Figure 7, the lower surface 223 at sleeve 22 is provided with the lambdoid first axial hydrodynamic groove row 224.And Fig. 8 is the vertical view of cap 23.As shown in Figure 8, the upper surface 231 at cap 23 is provided with the lambdoid second axial hydrodynamic groove row 232.When fan motor 1 stable state drove, following endless member 32 rotated to a direction with respect to sleeve 22 and cap 23.At this moment, make lubricating fluid 50 produce dynamic pressure by the first axial hydrodynamic groove row 224 and the second axial hydrodynamic groove row 232.By this dynamic pressure, following endless member 32 with respect to sleeve 22 and cap 23 axially supported.Namely, in the present embodiment, by as the upper surface 231 of the lower surface 223 of the sleeve 22 of Stationary side bearing surface and cap 23, constitute cod portion as the last circumferentia 321 of the following endless member 32 of rotation side shaft bearing surface and following circumferentia 322 and the lubricating fluid 50 between these several persons.
Return Fig. 5.In the present embodiment, between sleeve 22 and cap 23 and axle 31 and following endless member 32, be formed with continuous bag shape gap.And, maintain lubricating fluid 50 in this gap.50 of lubricating fluids have a liquid level 51 between the outer peripheral face of near the inner peripheral surface the upper end of sleeve 22 and axle 31.
When fan motor 1 stable state drives, the dynamic pressure that described radial dynamic pressure groove row 222 produce towards the below near the lubricating fluid 50 the liquid level 51.Thus, suppressing lubricating fluid 50 leaks to the outside.Particularly, in the present embodiment, the liquid level 51 of lubricating fluid 50 has only one.Therefore, lubricating fluid 50 is more difficult from dynamic pressure bearing mechanism 5 leakages.
And, in the present embodiment, as the inner peripheral surface 221 of the sleeve 22 of Stationary side bearing surface and form widelyer as the gap between the outer peripheral face 312 of the axle 31 of rotation side shaft bearing surface.Specifically, this gap is more than the 5 μ m and below the 20 μ m.And in the present embodiment, the gap between the following circumferentia 322 of the gap between the lower surface 223 of sleeve 22 and the last circumferentia 321 of following endless member 32 and the upper surface 231 of cap 23 and following endless member 32 also forms widelyer.Specifically, these gaps are below the above 40 μ m of 10 μ m.
If make each above-mentioned gap form widely, then be difficult to produce dynamic pressure.Therefore, even the counter-rotating by rotating part 3 and impeller 35 has produced the dynamic pressure towards last direction, the bearing portion that forms narrowly with described each gap compares the leakage that also can suppress lubricating fluid 50.
When using dynamic pressure bearing mechanism 5, by the effectiveness in vibration suppression of being brought by lubricating fluid, suppressed the vibration when fan motor 1 drives.Particularly, compare with the situation of the Bearning mechanism that uses other modes such as ball bearing or sliding bearing, can access the little fan motor 1 of vibration.And, compare with the situation of using ball bearing, use dynamic pressure bearing mechanism 5 can reduce the manufacturing cost of fan motor 1.
＜2-4. is about being equipped on the circuit of circuit board 〉
Fig. 9 is the figure of structure that expression is equipped on the circuit 40 of circuit board 4.Circuit 40 is made of with a plurality of distributions that are connected each electronic unit a plurality of electronic units.As shown in Figure 9, the circuit in the present embodiment 40 has voltage input part 41, reference potential portion 42, control signal input part 43, a plurality of integrated circuit 44 and coil connecting portion 45.
In coil connecting portion 45, coil 62U, the 62V corresponding with U phase, V phase and the W of three-phase alternating current, the end of 62W are connected with a neutral point 450.That is, in the present embodiment, a plurality of coil 62U, 62V and 62W connect in the mode of Y connection.And, in the other end side of each coil 62U, 62V and 62W, be connected with first distribution 46 that extends towards voltage input part 41 sides and second distribution 47 that extends towards reference potential portion 42 sides.
Be respectively arranged with switch element 81,82,83 at each first distribution 46.And be respectively arranged with switch element 84,85,86 at each second distribution 47.Switch element 81～86 is for switching the element of connection status and off-state according to the potential difference of source electrode 801 and grid 802.When each switch element 81～86 is connection status, between source electrode 801 and drain electrode 803, there is electric current to flow through.Switch element 81～86 for example can use metal-oxide half field effect transistor (MOSFET).
And the grid 802 of each switch element 81～86 is electrically connected with integrated circuit 44.Integrated circuit 44 is according to coming each switch element 81～86 output drive signals from the control signal of control signal input part 43 inputs.Thus, the current potential of the grid 802 of each switch element 81～86 changes.Consequently, the connection status of switch element 81～86 is switched mutually with off-state.That is, carry out switch motion.
State according to switch element 81～86 provides drive current to each coil 62U, 62V and 62W.Thus, produce magnetic flux at each coil 62U, 62V and 62W, fan motor 1 is driven.
(1) about short-circuit braking
Fan motor 1 has the function of the counter-rotating of the impeller 35 of the circuit 40 that utilizes Fig. 9 when suppressing non-drive.About this function, will be in following explanation.
When fan motor 1 does not drive, stop the signal of intention of the driving of fan motor 1 to control signal input part 43 input expression.Integrated circuit 44 receives this signal, and then the grid 802 to each switch element 81～83 on first distribution 46 applies be used to making switch element 81～83 be in the ON voltage of connection status.On the other hand, the grid 802 of each switch element 84～86 on 44 pairs of second distributions 47 of integrated circuit applies be used to making switch element 84～86 be in the OFF voltage of off-state.In the present embodiment, described ON voltage and OFF voltage are brake signal.
Each switch element 81～83 on first distribution 46 is in connection status, and when each switch element 84～86 on second distribution 47 was in off-state, the with dashed lines area surrounded 70 in Fig. 9 constituted a plurality of closed-loop paths.Specifically, constitute three groups of closed-loop paths, described closed-loop path comprises any two coils in the zone 70, and makes the both ends short circuit of described two coils by two switch elements on first distribution 46.
In this state, if impeller 35 counter-rotatings then produce electric current by the induced electromotive force that produces at coil 62 in described closed-loop path.This electric current makes the magnetic field of the counter-rotating that produces opposing rotating part 3 between stator unit 24 and the magnet 37.Thus, the counter-rotating of impeller 35 is inhibited.That is, by the closed-loop path in the zone 70, rotating part 3 is carried out short-circuit braking.
In addition, when fan motor 1 did not drive, integrated circuit 44 also can provide OFF voltage to the grid 802 of each switch element 81～83 on first distribution 46, and the grid 802 of each switch element 84～86 on second distribution 47 provides 0N voltage.At this moment, each switch element 81～83 on first distribution 46 is off-state, and each switch element 84～86 on second distribution 47 is connection status.Thus, constitute a plurality of closed-loop paths that comprise coil 62 and second distribution 47.At this moment, also can carry out short-circuit braking to rotating part 3 by this closed-loop path.
If suppressed the counter-rotating of rotating part 3, then suppressed lubricating fluid 50 and leaked from dynamic pressure bearing mechanism 5.And, can also be suppressed at the problem that dynamic pressure that lubricating fluid 50 produces disperses by dynamic pressure groove row 222,224,232.Consequently, the damage of dynamic pressure bearing mechanism 5 is inhibited, and can prolong the useful life of fan motor 1.
(2) braking about realizing by fixed magnetic field
Next, the second method to the counter-rotating that suppresses impeller 35 describes.
In the second approach, when fan motor 1 did not drive, integrated circuit 44 for example was provided as the ON voltage of brake signal to two switch elements 81,86 grid 802.And integrated circuit 44 is provided as the OFF voltage of brake signal to the grid 802 of other four switch elements 82～85.So, shown in the arrow of Fig. 9, produced the fixed magnetic field electric current 90 that passes through switch element 81, coil 62W, coil 62U and switch element 86 in turn.
Fixed magnetic field flows along specific direction respectively with respect to coil 62U, 62W continuously or intermittently with electric current 90.Thus, in coil 62U, 62W, produce magnetic field along specific direction.So, the particular magnetic polarity of a plurality of magnet 37 is attracted by this coil 62U, 62W.Consequently, suppressed the counter-rotating of impeller 35.
As shown in Figure 4, the fan motor in the present embodiment 1 has six magnet 37 and nine coils 62.That is, the fan motor in the present embodiment 1 is sextupole nine groove motors.Therefore, the angle intervals with respect to central axis 9 with respect to 37 of the magnet of the angle intervals of central axis 9 and homopolarity of 62 of the coils of homophase is 120 degree.Therefore, can dispose three magnet 37 of homopolarity at the radial outside of three coils 62 of homophase respectively.Therefore, realize easily the braking undertaken by fixed magnetic field.
In addition, be not limited to sextupole nine grooves, even four utmost points, six grooves or the ends of the earth 12 grooves, the angle intervals between the angle intervals between the coil 62 of homophase and the magnet 37 of homopolarity also is consistent.When the quantity of coil 62 is s, the number of poles of magnet 37 is m, when s/3=m/2 sets up, is the braking that realizes the rotating part 3 that undertaken by fixed magnetic field easily.
If fixed magnetic field then consumes electric power with electric current 90 circulations.Consider this point, also can make integrated circuit 44 have the function of fixed magnetic field being carried out pulse width modulation (PWM) control with electric current 90.And the drive current in the time of integrated circuit 44 being had drive than stable state suppresses fixed magnetic field more with the current limit function of the current value of electric current 90.If fixed magnetic field is carried out pulse width modulation or electric current restriction with electric current 90, then in the power consumption when suppressing non-the driving, also can suppress the counter-rotating of impeller 35.
And, fixed magnetic field with electric current also can be with Fig. 9 in fixed magnetic field with the electric current of the different path flow of electric current 90.For example, fixed magnetic field also can be the electric current of flowing through coil 62U and coil 62V with electric current, also can be the electric current of flowing through coil 62V and coil 62W.That is, the fixed magnetic field electric current is for being provided for coil and getting final product along the mobile electric current of specific direction continuously or intermittently by switch element.
And, for the braking that realizes being undertaken by fixed magnetic field, fixed magnetic field is flowed at the coil corresponding with at least one phase place of three-phase alternating current with electric current gets final product.For example, also can adopt Y connection mode of connection in addition at the coil connecting portion of circuit, fixed magnetic field is flow through and a coil that phase place is corresponding with electric current.
And, during impeller 35 counter-rotatings, also can at first make the rotary speed reduction of impeller 35 by the short-circuit braking of described (1), the braking that is realized by fixed magnetic field by described (2) stops impeller 35 then.
＜3. variation 〉
More than the illustrative execution mode of the utility model is illustrated, but the utility model is not limited to above-mentioned execution mode.Below, centered by the difference of variation and described second execution mode, various variation are described.
The example of＜3-1. single-phase motor 〉
Figure 10 is the figure of the structure of the related circuit 40B of expression one variation.The circuit 40B of Figure 10 is corresponding with the fan motor of single-phase driving.In the example of Figure 10, a pair of first distribution 46B that extends towards voltage input part 41B side is connected with the both ends of single phase winding 62B respectively with a pair of second distribution 47B that extends towards the 42B of reference potential portion side.
Be provided with switch element 81B～84B at a pair of first distribution 46B and a pair of second distribution 47B.And diode 71B～74B is connected side by side with each switch element 81B～84B.Each diode 71B～74B passes through the electric current that flows to voltage input part 41B side, and cuts off the electric current that flows to the 42B of reference potential portion side.
And, between the source electrode 801B of switch element 81B, 82B and integrated circuit 44B, be provided with diode 75B.This diode 75B passes through the electric current that flows to the source electrode 801B of switch element 81B, 82B from voltage input part 41B, and cuts off the electric current that flows to integrated circuit 44B from the source electrode 801B of switch element 81B, 82B.
In the loop diagram of Figure 10, thereby if the impeller counter-rotating produces induced electromotive force at coil 62B, then induced current flows to each source electrode 801B of switch element 81B, 82B by diode 71B, 72B.Thus, the current potential of each source electrode 801B of switch element 81B, 82B changes.On the other hand, induced current can not flow to integrated circuit 44B side by diode 75B.Therefore, the current potential of each grid 802B of switch element 81B, 82B can not change because of the induced electromotive force of coil 62B.
Therefore, in the electronic circuit 40B of Figure 10, can utilize the induced electromotive force of coil 62B that the source electrode 801B of switch element 81B, 82B and the potential difference of grid 802B are changed.Thus, can make switch element 81B, 82B be in connection status.So, even under the situation that can not obtain external power source, in the regional 70B of Figure 10, also can constitute the closed-loop path at the both ends of connecting coil 62B by switch element 81B, 82B.Therefore, can carry out short-circuit braking to rotating part.
In the example of Figure 10, diode 71B, 72B constitute to switch element 81B, 82B provides the driving signal that drives signal that portion is provided.And induced current is utilized as brake signal.And in the example of Figure 10, diode 75B constitutes the cut-out portion that flows to the electric current of integrated circuit 44B side from the closed-loop path that cuts off.But, also can replace diode 75B and with switch element as cut-out portion.And, also can make integrated circuit 44B have the function of cut-out portion.
And, in the circuit 40B of Figure 10, also can realize braking by fixed magnetic field.When fixed magnetic field was produced, integrated circuit 44B for example provided ON voltage to the grid 802B of two switch element 81B, 84B.And integrated circuit 44B provides OFF voltage to the grid 802B of other two switch element 82B, 83B.So, shown in arrow among Figure 10, produced the fixed magnetic field electric current 90B that passes through switch element 81B, coil 62B and switch element 84B successively.Therefore, produce magnetic field at coil 62B along specific direction.Consequently, the particular magnetic polarity of a plurality of magnet is attracted by coil 62B, thereby has suppressed the counter-rotating of impeller.
In addition, integrated circuit 44B also can provide OFF voltage to the grid 802B of two switch element 81B, 84B, provides ON voltage to the grid 802B of other two switch element 82B, 83B.At this moment, produce successively fixed magnetic field electric current by switch element 82B, coil 62B and switch element 83B.
The example that the structure of＜3-2. dynamic pressure bearing mechanism is different 〉
Figure 11 is the longitudinal section of the related fan motor 1C of other variation.The structure of the dynamic pressure bearing mechanism 5C of the fan motor 1C of Figure 11 is different with above-mentioned second execution mode.
In the example of Figure 11, by the axle 31C of sleeve 22C, the cap 23C of stationary part 2C side and this three of sleeve casing 25C, rotating part 3C side, endless member 32C and last this three of endless member 33C and lubricating fluid 50C constitute dynamic pressure bearing mechanism 5C down.
Sleeve 22C is fixed in the roughly inboard of sleeve casing 25C cylindraceous.Cap 23C stops up the opening of the bottom of sleeve casing 25C.In this example, constitute sleeve part by sleeve 22C and sleeve casing 25C.
And last endless member 33C has the cylindrical portion 332C that is fixed in axle 31 inboard annulus 331C and extends at the radial outside of inboard annulus 331C downwards.Cylindrical portion 332C is positioned at the radial outside of sleeve casing 25C.And the liquid level 51C of lubricating fluid 50C is between the inner peripheral surface of the outer peripheral face of sleeve casing 25C and cylindrical portion 332C.
In this example, near the outer peripheral face the upper end of the upper surface of near the inner peripheral surface the bottom of the upper surface of the upper surface of the lower surface of the inner peripheral surface of sleeve 22C, sleeve 22C, sleeve 22C, cap 23C, sleeve casing 25C, sleeve casing 25C and sleeve casing 25C is the stationary axle bearing surface.And upper surface, the lower surface of inboard annulus 331C and the inner peripheral surface of cylindrical portion 332C of the outer peripheral face of axle 31C, the lower surface of following endless member 32C, following endless member 32C are the rotating shaft bearing surface.And at least one side in stationary axle bearing surface and rotating shaft bearing surface is provided with dynamic pressure groove row.
Other variation of＜3-3. 〉
Fan motor of the present utility model also can be equipped on the device beyond the electronic equipment.And, the purpose beyond fan motor of the present utility model also can be used for cooling off.And the structure at the shape at the details position of fan motor, the details position of circuit also can be different with respectively illustrating of the application.And in the scope that does not produce contradiction, each key element that occurs in described execution mode and the variation can be carried out appropriate combination.
The utility model can be used in fan motor.
Claims (13)
1. a fan motor is characterized in that, described fan motor comprises:
Stationary part;
Rotating part, it is supported for and can rotates by described stationary part;
Dynamic pressure bearing mechanism, it is between described stationary part and described rotating part; And
Drive controlling organization, its rotation of controlling described rotating part drives,
Described stationary part has coil,
Described rotating part have impeller and with the opposed magnet of described coil,
Described rotating part drives to a direction rotation when stable state drives,
Described dynamic pressure bearing mechanism comprises:
The stationary axle bearing surface, it is arranged at described stationary part side;
The rotating shaft bearing surface, it is arranged at described rotating part side; And
Lubricating fluid, its between described stationary axle bearing surface and described rotating shaft bearing surface,
At least one side in described stationary axle bearing surface and described rotating shaft bearing surface is provided with dynamic pressure groove row,
At described rotating part during to described direction rotation, described dynamic pressure groove row produce towards the dynamic pressure away from the direction of liquid level described lubricating fluid,
Described driving controlling organization comprises:
Drive signal portion is provided, it provides the driving signal; And
Switch element, it carries out switch motion according to described driving signal, provides drive current to described coil,
When non-driving or during described rotating part counter-rotating, described driving signal provides portion to described coil output brake signal, and this brake signal is for generation of the magnetic field of the counter-rotating of the described rotating part of opposing.
2. fan motor according to claim 1,
Constitute the closed-loop path at described driving controlling organization, this closed-loop path makes the both ends short circuit of described coil by described switch element.
3. fan motor according to claim 2,
Described switch element is the element that switches connection status and off-state according to the potential difference between source electrode and grid,
Described source electrode and voltage are connected according to the part that the induced electromotive force of described coil changes,
Described grid and voltage are not connected according to the part that the induced electromotive force of described coil changes.
4. fan motor according to claim 3,
Described fan motor also has cut-out portion, and this cut-out portion is used for cut-out and flows to the electric current that described driving signal provides portion's side from described closed-loop path.
5. fan motor according to claim 2,
Described switch element is the element that switches connection status and off-state according to the potential difference between source electrode and grid,
When described fan motor did not drive, described driving signal provided portion to be provided for making described switch element to be in the voltage of connection status to described grid.
6. fan motor according to claim 1,
When described fan motor did not drive, described driving controlling organization provided the fixed magnetic field that flows to specific direction electric current to described coil continuously or intermittently by described switch element.
7. fan motor according to claim 6,
Described stationary part has a plurality of coils corresponding with each phase place of three-phase the two poles of the earth or three-phase full-wave,
When described fan motor did not drive, described driving controlling organization applied described fixed magnetic field electric current to the coil corresponding with at least one phase place.
8. fan motor according to claim 7,
If the quantity of described coil is s, the number of poles of described magnet is m, and this moment, s/3=m/2 set up.
9. according to each the described fan motor in the claim 6 to 8,
Described driving controlling organization flows to the horizontal pulse width modulated to described fixed magnetic field electricity consumption or carries out the electric current restriction.
10. according to each the described fan motor in the claim 1 to 8,
Described dynamic pressure bearing mechanism has the gap of continuous bag shape between described stationary axle bearing surface and described rotating shaft bearing surface,
The described lubricating fluid that remains on described gap has single liquid level.
11. fan motor according to claim 10,
Described stationary part also has the sleeve part cylindraceous of the radially inner side that is disposed at described coil,
Described rotating part also comprises:
Axle, it is inserted in the inboard of described sleeve part; And
Endless member, it is fixed in described axle, and has axial end face with described sleeve part in axial opposed circumferentia,
Described dynamic pressure bearing mechanism comprises:
Journal bearing portion, the outer peripheral face of its inner peripheral surface by described sleeve part, described axle and constitute between the lubricating fluid between the two; And
Cod portion, it constitutes by the described circumferentia of the axial end face of described sleeve part, described endless member and between the lubricating fluid between the two.
12. fan motor according to claim 11,
The liquid level of described lubricating fluid is between the outer peripheral face of the inner peripheral surface of described sleeve part and described axle.
13. fan motor according to claim 11,
Described endless member has the cylindrical portion of the radial outside that is positioned at described sleeve part,
The liquid level of described lubricating fluid is between the inner peripheral surface of the outer peripheral face of described sleeve part and described cylindrical portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011276992A JP2013128371A (en) | 2011-12-19 | 2011-12-19 | Fan motor |
| JP2011-276992 | 2011-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203039505U true CN203039505U (en) | 2013-07-03 |
Family
ID=48691590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220679089 Expired - Fee Related CN203039505U (en) | 2011-12-19 | 2012-12-11 | Fan motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2013128371A (en) |
| CN (1) | CN203039505U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836482A (en) * | 2015-05-25 | 2015-08-12 | 上海电机学院 | Magnetic suspension mute radiator |
| CN106329821A (en) * | 2015-06-26 | 2017-01-11 | 佛山市建准电子有限公司 | Motor system and fan system using same |
| CN111434924A (en) * | 2019-01-11 | 2020-07-21 | 劳斯莱斯有限公司 | Electric machine |
| CN112234778A (en) * | 2020-09-29 | 2021-01-15 | 中车永济电机有限公司 | Bearing protection method during transportation of permanent magnet motor |
| CN112443511A (en) * | 2019-08-27 | 2021-03-05 | 建准电机工业股份有限公司 | Bearing system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7202868B2 (en) * | 2018-12-10 | 2023-01-12 | 株式会社ニッセイ | MOTOR COIL TEMPERATURE ESTIMATION METHOD AND MOTOR DRIVING DEVICE |
-
2011
- 2011-12-19 JP JP2011276992A patent/JP2013128371A/en active Pending
-
2012
- 2012-12-11 CN CN 201220679089 patent/CN203039505U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836482A (en) * | 2015-05-25 | 2015-08-12 | 上海电机学院 | Magnetic suspension mute radiator |
| CN106329821A (en) * | 2015-06-26 | 2017-01-11 | 佛山市建准电子有限公司 | Motor system and fan system using same |
| CN106329821B (en) * | 2015-06-26 | 2018-11-20 | 佛山市建准电子有限公司 | Motor system and the fan system for using the motor system |
| CN111434924A (en) * | 2019-01-11 | 2020-07-21 | 劳斯莱斯有限公司 | Electric machine |
| CN111434924B (en) * | 2019-01-11 | 2024-02-02 | 劳斯莱斯有限公司 | Aircraft engine with integrated electric motor |
| CN112443511A (en) * | 2019-08-27 | 2021-03-05 | 建准电机工业股份有限公司 | Bearing system |
| CN112234778A (en) * | 2020-09-29 | 2021-01-15 | 中车永济电机有限公司 | Bearing protection method during transportation of permanent magnet motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2013128371A (en) | 2013-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20201211 |