CN203967881U - Motor and electric equipment - Google Patents
Motor and electric equipment Download PDFInfo
- Publication number
- CN203967881U CN203967881U CN201420401245.0U CN201420401245U CN203967881U CN 203967881 U CN203967881 U CN 203967881U CN 201420401245 U CN201420401245 U CN 201420401245U CN 203967881 U CN203967881 U CN 203967881U
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- Prior art keywords
- bearing
- motor
- rotating shaft
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- thrust plate
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- 239000000428 dust Substances 0.000 claims abstract description 41
- 238000004804 winding Methods 0.000 claims abstract description 17
- 230000007935 neutral effect Effects 0.000 description 20
- 230000003068 static effect Effects 0.000 description 19
- 238000000034 method Methods 0.000 description 13
- 238000009413 insulation Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 11
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 230000005284 excitation Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000004519 grease Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2380/00—Electrical apparatus
- F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
Landscapes
- Motor Or Generator Frames (AREA)
- Sealing Of Bearings (AREA)
- Rolling Contact Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The utility model provides a kind of motor and electric equipment.This motor has: stator, and its package has winding; Rotor, it comprises with stator practises physiognomy and is circumferentially maintaining the rotary body and the rotating shaft being connected with rotary body of permanent magnet over the ground; Ball bearing, it is with rotating shaft rotation mode supporting shaft freely; And thrust plate, it is connected with rotating shaft.And ball bearing has the dust excluding plate being electrically connected to its outer ring, thrust plate is electrically connected to the inner ring of ball bearing, and has the opposite face of facing mutually with the planar portions of the dust excluding plate of ball bearing.By adopting said structure, can suppress the galvano-cautery noise of bearing.
Description
Technical field
The utility model relates to a kind of motor and electric equipment, particularly relates to the motor of improveing and the electric equipment that possesses this motor in order to suppress bearing generation galvano-cautery.
Background technology
As everyone knows, in the symmetrical three-phase circuit based on sinusoidal wave, when the circuit condition that makes each phase is identical, the neutral point of Y tie lines is expressed as constant value all the time, between the neutral point of the Y of mains side tie lines and the neutral point of the Y tie lines of load-side, does not produce potential difference.In addition, the sine wave of three phase mains is now the undistorted sine wave that does not contain high order harmonic component composition, self-evident as prerequisite.
In addition, when the condition of the loop circuit of each phase of three-phase circuit is uneven, the neutral point of the load-side of Y tie lines is not zero potential, but is expressed as the current potential of certain value.These situations as such as patent documentation 1 grade by likewise known.In addition, the observation of the shaft voltage that next will illustrate needs to spend a little time as follows, that is, to some circuit position of three-phase circuit, for the mid point of convenient and bleeder circuit that set, measure etc. as the potential difference of virtual neutral point etc.
In actual symmetrical three-phase circuit, due to a variety of causes, cause the sine wave of three phase mains imbalance, three phase mains to comprise some high order harmonic component compositions, the neutral point place of the neutral point of the Y tie lines that can observe at mains side and the Y tie lines of load-side has produced a little current potential.And, due to the potential change of this neutral point, and at the rotating shaft of generator, the magnitude of voltage inducing on the rotating shaft of motor, so-called shaft voltage is observed.This shaft voltage also puts on the inner ring of the bearing for rotating shaft rotation is supported freely.
On the other hand, the outer ring of bearing is electrically connected to gabarit, the ground connection position of generator or motor, and therefore, the outer ring of bearing becomes the current potential different from the current potential of the inner ring of bearing, between the inner ring of bearing and outer ring, produces potential difference.And, by the rolling element of bearing, between these members of outer ring, rolling element and inner ring, discharge.At this electric discharge position, produce electric discharge trace, this electric discharge trace is called to galvano-cautery.And, this trace that discharges, i.e. galvano-cautery causes bearing to produce when rotated unfavorable condition.
For example, as patent documentation 2～4 grades, record, in the generator of three phase mains, and the imbalance of the magnetic circuit that cause irregular by the assembling of generator, cause obtaining symmetrical three-phase alternating current and produce unbalanced three-phase alternating current, thereby producing the shaft voltage being caused by neutral point generation current potential.
In addition, in the situation that the field power supply of the excitation winding of generator is the excitation unit that has adopted thyristor etc., excitation winding is applied to the voltage of the non-sinusoidal waveform waveform that comprises a large amount of high order harmonic components.The equiva lent impedance composition that the voltage of this non-sinusoidal waveform waveform produces by the member of formation except excitation winding by generator, produces the shaft voltage that the excitation electric power by above-mentioned excitation unit causes.
In addition, as recorded in above-mentioned patent documentation etc., as the distinctive phenomenon of generator, charged with the part generation ionization of the steam of the blade collision of steamturbine.And, be known to the equiva lent impedance composition that electric charge that the ionization by steam produces produces by the member of formation of generator and transmit to rotating shaft, and show as the shaft voltage of generator, thereby cause the galvano-cautery of bearing.
On the other hand, such as patent documentation 5 grades, record like that, be known in the motor of the load-side in three-phase circuit, also there is the galvano-cautery of the bearing that shaft voltage that the imbalance by three-phase alternating current causes causes.In addition, as document etc. record, in the situation that carrying out drive motor by DC-to-AC converter, by every secondary source conversion, cause instantaneous Voltage unbalance, cause neutral point current potential with very high frequency content (number MHz) change, thereby produce shaft voltage (shaft current), and the galvano-cautery that produces the bearing of motor.
Recently, in the field of motor, utilize the Driving technique of DC-to-AC converter very prevailing.The driving that utilizes this DC-to-AC converter from utilize the driving in undistorted sine voltage source completely different, utilize the driving of this DC-to-AC converter to form the wavy voltage source of rectangle, thereby realize virtual three-phase drive.In the driving that utilizes DC-to-AC converter, patent documentation 5 described above is such, produces the caused shaft current of change (shaft voltage) due to neutral point current potential, and the galvano-cautery that easily produces the bearing of motor.
As everyone knows, utilizing the driving of DC-to-AC converter is not the driving by the undistorted sinusoidal wave three-phase alternating current producing.Therefore, obviously known, at the neutral point place of the Y of motor tie lines, the magnitude of voltage that can not have each phase cancels each other out and becomes all the time the situation of zero level, but produces the situation of certain magnitude of voltage.
For example, as recorded in non-patent literature 1 grade, at the neutral point place of the Y tie lines of the motor that utilizes DC-to-AC converter to drive, produce and represent the periodicity being produced by convex waveform ripple and rectangular wave and compared with the magnitude of voltage of the change in voltage of large amplitude, the maximum of this convex waveform ripple and rectangular wave can reach the supply voltage value of DC-to-AC converter.And, as this non-patent literature etc. record, the potential change of this neutral point is as observed by the shaft voltage of its caused rotating shaft.
Also as recorded in non-patent literature 1 grade, from the driving voltage of each phase of DC-to-AC converter from the stator winding of the stator of motor the impedance composition through stator member of formation, as electric energy, to the outside of stator, transmit.The transmission of this electric energy is the rotor transmission to motor by the stator of motor and the distributed capacitance composition between rotor, and further passes through the impedance composition of rotor member of formation, arrives rotating shaft.At this, rotating shaft is positioned at the neutral point of the equivalent Y tie lines of three-phase circuit, therefore, can observe at this rotating shaft place the variation of some current potentials.As mentioned above, the variation of this current potential is called to shaft voltage.
Yet well-known, 3 subharmonic compositions of each phase of three-phase circuit can not cancel each other out, and can be observed at the neutral point place of Y tie lines.In addition, as everyone knows, at the neutral point place of Y tie lines, can also observe the uneven composition of each phase.
In addition, particularly, as Driven by inverter, employing utilizes the mode that the inverter of pulse-width modulation (Pulse Width Modulation) mode (hereinafter referred to as PWM mode) drives mostly.In the situation that the Driven by inverter of such PWM mode, the current potential of the neutral point of winding can not become zero but can produce some voltages, and reason as mentioned above.
In addition, potential change for above-mentioned neutral point, in the situation that carried out resolving as the viewpoint of three-phase circuit from the equivalent electric circuit that the electrical equivalent impedance composition of each inscape of motor is produced, the rotating shaft of motor also can be thought the neutral point of the equivalent Y tie lines of above-mentioned equivalent electric circuit, and the situation that produces some potential change at rotating shaft is self-evident.
The viewpoint of the equivalent electric circuit producing with the electrical equivalent impedance composition of each inscape by this motor, resolves the generation of shaft voltage, seeks the inhibition of galvano-cautery, about such being documented in the known documents such as above-mentioned patent documentation 5, is seen everywhere.The equivalent electric circuit of motor is divided into a variety of, as the parsing of the viewpoint from the fixed number circuit that distributes obtains, from distribute fixed number circuit to concentrate fixed number circuit model the equivalent electric circuit that obtains of the parsing of viewpoint etc.
Driven by inverter by motor causes producing shaft voltage, thereby produces potential difference between the outer ring of bearing and inner ring.And, in shaft voltage, comprise the radio-frequency component producing by switching.When the potential difference being caused by shaft voltage reaches the insulation breakdown voltage of oil film of bearing inside, in the inside of bearing, there is high-frequency current to flow, and produce galvano-cautery bearing is inner.In the developed situation of this galvano-cautery, in the inside of bearing inner race or outer ring, produce wavy wear phenomenon, produce sometimes abnormal sound, galvano-cautery is as the representational bad phenomenon of motor, and its solution is being sought always.
As mentioned above, this galvano-cautery is the phenomenon that bearing material sustains damage because of arc discharge, by shaft voltage, caused between the inner ring of bearing and the outer ring of bearing and produced potential difference, therefore, shaft current flows in such path, the outer ring of the inner ring-ball-bearing of bearing.Therefore,, in order to suppress the galvano-cautery of motor, following countermeasure is proposed.
(1) make between bearing inner race and outer ring in conducting state.
(2) make between bearing inner race and outer ring in state of insulation.
(3) reduce shaft voltage.
And as the concrete grammar of above-mentioned (1), the lubricant that exemplifies the bearing of sening as an envoy to has conductivity.But, exist conductive lubricant through its conductive characteristic after a while can variation, the problem such as slip reliability shortcoming.In addition, also can consider brush is set on rotating shaft, realize the method for conducting state, the method also existence can produce wear of brush powder, need brush that the problems such as space are set.
In addition, as the additive method of above-mentioned (1), also study the structure using sliding bearing as bearing.For example, by adopting sintering metal oiliness bearing, can make bearing portion in conducting state.As everyone knows, in the motor of the Driven by inverter of PWM mode in recent years, adopt the motor of a pair of ball bearing to become main flow, but before also seeing, use the motor of pair of sliding bearing.
For example, the situation that patent documentation 6, patent documentation 7 etc. are recorded is an example.Bearing portion, in conducting state, does not therefore have discharge generation, just do not produce galvano-cautery, but the running accuracy of rotating shaft is compared with the situation of having used ball bearing deteriorated yet.In addition, well-known, bearing loss is larger, therefore, compare with having used the situation of ball bearing, the Efficiency Decreasing of motor.
And the concrete grammar as above-mentioned (2), exemplifies out and converts the material of the rolling element of bearing inside the methods such as ceramic material of insulator to from the metal materials such as iron of conductive material.The method prevent galvano-cautery aspect very effective, but use the situation cost of ceramic material to uprise, cause the problem of economic aspect.
In addition, as the additive method of above-mentioned (2), also study the structure using the sliding bearing of insulating properties as bearing.For example, adopt the insulating properties sliding bearing of the resin that has used patent documentation 8 records such as grades, thereby can make bearing portion in state of insulation.On the bearing portion of insulating properties, do not produce galvano-cautery having.But the same with above-mentioned situation, the running accuracy of rotating shaft is compared deteriorated with the situation of using ball bearing, in addition, well-known, bearing loss is larger, therefore, compare with having used the situation of ball bearing, the Efficiency Decreasing of motor.
In addition, concrete grammar as above-mentioned (3), be known to by making stator core and thering is electrical short between the metal end cap of conductivity, the equivalent electric circuit of motor is changed, and the contribution degree of static capacity composition is changed, thereby reduce the method (such as patent documentation 9 etc.) of shaft voltage.In addition, the structure that stator core that is also known to motor etc. is electrically connected to the ground wire of the earth (such as patent documentation 10 etc.).
But the such method in the past of patent documentation 9 is the method that makes short circuit between stator core and metal end cap, therefore, the static capacity of the equivalent electric circuit of motor distributes integral body is uprised, and causes shaft voltage to uprise.
In addition, in the situation that be configured to, in PWM mode, motor is carried out electric insulation between the power-supply circuit of drive circuit (comprising control circuit etc.) of Driven by inverter and the ground wire being connected to the earth of 1 lateral circuit of this power-supply circuit and 1 lateral circuit side, as shown in patent documentation 10, even the structure that the stator core of employing motor etc. is electrically connected to the ground wire of the earth, the reduction of shaft voltage is also more difficult.
In addition, if shaft voltage is not to compare enough little magnitude of voltage with the insulation breakdown proof voltage of bearing monomer, is difficult to prevent chronically the electrical short phenomenon of generation in bearing, thereby is difficult to suppress galvano-cautery.Its reason is, in the situation that applying shaft voltage to bearing for a long time, by the damage deteriorated, bearing surface of lubricating grease, causes that the insulation breakdown proof voltage of bearing monomer reduces.
Therefore, at the driving initial stage of motor, to compare with shaft voltage, the insulation breakdown proof voltage of bearing is higher, do not produce short circuit phenomenon, even in this case, when driving for a long time, the insulation breakdown proof voltage of bearing monomer reduces, compare with shaft voltage, the insulation breakdown proof voltage of bearing monomer diminishes, thereby causes short circuit phenomenon, consequently produces galvano-cautery.
The insulation breakdown proof voltage of bearing can increase by the oil film of thickening lubricating grease, conventionally adopts the method for the kinematic viscosity increase that makes grease base plinth oil.But when the kinematic viscosity of grease base plinth oil is increased, bearing loss increases, and the Efficiency Decreasing of motor, therefore, makes oil film thickness increase have limit.
Patent documentation 1: Japanese kokai publication hei 8-340637 communique
Patent documentation 2: Japanese Patent Publication 47-41121 communique
Patent documentation 3: Japanese kokai publication sho 50-76547 communique
Patent documentation 4: Japanese kokai publication sho 57-16549 communique
Patent documentation 5: Japanese kokai publication hei 10-32953 communique
Patent documentation 6: Japanese Patent Publication 61-52618 communique
Patent documentation 7: Japanese kokai publication hei 8-214488 communique
Patent documentation 8: TOHKEMY 2011-47495 communique
Patent documentation 9: TOHKEMY 2007-159302 communique
Patent documentation 10: TOHKEMY 2004-229429 communique
Non-patent literature 1:[Fuji Times the 72nd volume, No. 2 (in February, 1999)], イ Application バ ー タ drive Move Lure Guide Electricity Move Machine Shaft Electricity press (a kind of shaft voltage of Driven by inverter induction motor) P.144～P.149
Utility model content
The utility model provides a kind of bearing that can suppress to produce the motor of galvano-cautery and the electric equipment that possesses this motor.
Motor of the present utility model has: stator, and its package has winding; Rotor, it comprises with stator practises physiognomy and is circumferentially maintaining the rotary body and the rotating shaft being connected with rotary body of permanent magnet over the ground; Ball bearing, it is with axle rotation mode supporting shaft freely; And thrust plate (Thrust plate), it is connected with rotating shaft.And ball bearing has the dust excluding plate being electrically connected to its outer ring, thrust plate is electrically connected to the inner ring of ball bearing, and has the opposite face of facing mutually with the planar portions of the dust excluding plate of ball bearing.
In addition, motor of the present utility model also comprises following structure: the external diameter of thrust plate is greater than the external diameter of planar portions of the dust excluding plate of ball bearing.
In addition, motor of the present utility model also comprises following structure: thrust plate is 50 μ m～100 μ m with the distance being connected with the outer ring of ball bearing between the dust excluding plate of switching on.
In addition, electric equipment of the present utility model is equipped with above-mentioned motor.
Adopt such structure, a kind of motor of the galvano-cautery noise that has suppressed bearing and the electric equipment that possesses this motor can be provided.
Accompanying drawing explanation
Fig. 1 means the structural map of section of the brushless motor of execution mode 1 of the present utility model.
Fig. 2 is near the structure cutaway view of bearing of embodiment 1 of the present utility model.
Fig. 3 is the stereogram of the thrust plate of embodiment 1 of the present utility model.
Fig. 4 means the inner ring of bearing and the figure of the static capacity between outer ring and the relation between shaft voltage of execution mode 1 of the present utility model.
Fig. 5 is near the structure cutaway view of bearing of embodiment 2 of the present utility model.
Fig. 6 is the stereogram of the E type thrust plate of embodiment 2 of the present utility model.
Fig. 7 is the structure chart as the indoor apparatus of air conditioner of the example of the electric equipment of execution mode 2 of the present utility model.
Embodiment
Below, with reference to accompanying drawing and table explanation the utility model.In addition, the utility model is not limited to following execution mode and embodiment.
(execution mode 1)
Fig. 1 means the structural map of section of the motor of execution mode 1 of the present utility model.In the present embodiment, exemplified brushless motor 100 and described as an example of motor, this brushless motor 100 is equipped on the air-conditioning as electric equipment, for driving blowing fan.In addition, in the present embodiment, enumerate the example of motor that rotor is configured in the inner-rotor type of stator inner circumferential side freely and describe.
In Fig. 1, on stator core 11, across the resin 21 of the insulator as for stator core 11 is insulated, reel stator winding 12 is installed.And such stator core 11 utilizes as the insulating resin 13 of moulding material mold formed with together with other fixed component.In the present embodiment, by this wise that these members are molded integrally formed, and can form the stator 10 that profile is general cylindrical shape shape.
Rotor 14 is inserted across space in inner side at stator 10.Rotor 14 has the discoideus rotary body 30 that comprises rotor core 31 and to run through the mode of rotary body 30 central authorities, is connected the rotating shaft 16 of rotary body 30.Rotary body 30 is faced the ground, inner circumferential side of stator 10 at the magnet 32 circumferentially maintaining as the ferrite resin of permanent magnet.
In Fig. 1, as rotary body 30, show the integrally formed structure example of magnet 32 of above-mentioned rotor core 31 and ferrite resin.So, the outer circumferential side of the inner circumferential side of stator 10 and rotary body 30 configures mode to practise physiognomy.
As the bearing 15 for supporting shaft 16, output shaft side bearing 15a and output shaft opposition side bearing 15b are installed in the rotating shaft 16 of rotor 14.Output shaft side bearing 15a and output shaft opposition side bearing 15b are the bearings with the drum of a plurality of iron balls, and the inner ring side of output shaft side bearing 15a and output shaft opposition side bearing 15b is fixed on rotating shaft 16.
In Fig. 1, becoming the output shaft side of rotating shaft 16 from the outstanding side of brushless motor body, output shaft side bearing 15a supporting shaft 16, in its contrary side (output shaft opposition side), output shaft opposition side bearing 15b supporting shaft 16.
And above-mentioned output shaft side bearing 15a and output shaft opposition side bearing 15b, respectively by the metal end cap with conductivity, fix the outer ring side of output shaft side bearing 15a and output shaft opposition side bearing 15b.In Fig. 1, output shaft side bearing 15a is fixing by output shaft side end cap 17, and output shaft opposition side bearing 15b is fixing by output shaft opposition side end cap 19.Utilize above such structure, rotating shaft 16 is supported on to output shaft side bearing 15a and output shaft opposition side bearing 15b, and make rotor 14 rotations rotation freely.
In addition, output shaft side bearing 15a and output shaft opposition side bearing 15b are filled with the lubricating grease filling up in the part of the inner space of its bearing inside.The above-mentioned output shaft side bearing 15a as the bearing 15 in present embodiment and output shaft opposition side bearing 15b are called as " ball bearing of both sides dust-protection type ", and the project mark of " code name " of take in field of bearings is " ZZ ", by the bearing of likewise known.For the detailed structure of such bearing 15, will further illustrate below.
In addition, in the present embodiment, dispose near such bearing 15, and be connected to the discoid thrust plate in rotating shaft.The detailed structure of this thrust plate will be described below.
And the brushless motor 100 of present embodiment is built-in with the printed base plate 18 that drive circuit has been installed, this drive circuit comprises control circuit.Built-in, after this printed base plate 18, by being pressed into stator 10, output shaft side end cap 17 forms brushless motor 100.
In addition, be connected with connecting line 20 on printed base plate 18, this connecting line 20 is for applying the supply voltage Vdc of winding, the power source voltage Vcc of control circuit and control the wire of the control voltage Vsp of rotating speed, the earth connection of control circuit etc.
In addition, zero-potential point portion on the printed base plate 18 of drive circuit and ground wire and the insulation of 1 side (power supply) circuit of the earth are installed, the current potential of the ground wire of the earth and 1 side power circuit is in quick condition.
Here, zero-potential point portion refers on printed base plate 18 wiring as 0 volt of current potential of reference potential, represents to be commonly called the ground wiring on ground.The ground wire that connecting line 20 comprises and this zero-potential point portion, the connection of connecting up.
In addition, be provided with on the printed base plate 18 of drive circuit, connect for supply with the supply voltage of winding power circuit, for the power circuit of the supply voltage of supply control circuit, for apply control the wire of voltage and the ground wire of control circuit etc. with for supplying with between any one of ground wire of 1 side (power supply) circuit, the ground wire of the earth being connected for 1 side (power supply) circuit and above-mentioned 1 side (power supply) circuit of the power circuit of the supply voltage of supply control circuit and the earth of independent grounding of power circuit of supply voltage of winding all electric insulations.
That is, the current potential for the ground wire of 1 side (power supply) circuit current potential and the earth, has been arranged on the drive circuit of printed base plate 18 in electric insulating state, and therefore, current potential is suspended state.
The state that this also shows as potential fluctuation, is widely known by the people.In addition, thus, be connected with printed base plate 18 for supply with winding supply voltage power circuit and for the structure of the power circuit of the supply voltage of supply control circuit, be also referred to as floating power supply, this is also the performance being widely known by the people.
For this brushless motor 100 forming like that above, by connecting line 20, supply with each supply voltage and control signal, thereby utilize the drive circuit of printed base plate 18 to drive stator winding 12.When stator winding 12 is driven, drive current flows at stator winding 12, from stator core 11, produces magnetic field.
And, utilize from the magnetic field of stator core 11 with from the magnetic field of the magnet 32 of ferrite resin, correspondingly produce gravitation and repulsion with the polarity in above-mentioned magnetic field, utilize above-mentioned power that rotor 14 is rotated centered by rotating shaft 16.
Then, the detailed structure of this brushless motor 100 is described.First, this brushless motor 100, as mentioned above, rotating shaft 16 is supported by output shaft side bearing 15a and output shaft opposition side bearing 15b, and also, supporting fixing by end cap 17, end cap 19 respectively of each output shaft side bearing 15a and output shaft opposition side bearing 15b.
And, in the present embodiment, be configured to metal end cap 17, end cap 19 that each output shaft side bearing 15a and output shaft opposition side bearing 15b had respectively conductivity fixing.That is, in the present embodiment, fixing for output shaft side bearing 15a and output shaft opposition side bearing 15b, adopts the end cap 17,19 of the good conductivity of the dimensional accuracy that processed by steel plate in advance.Particularly, in the situation that require the high output of motor, be more preferably such structure.
Particularly, first, for output shaft opposition side bearing 15b, the end cap 19 of the periphery footpath that utilizes periphery footpath and output shaft opposition side bearing 15b output shaft opposition side is about equally fixed.In addition, the end cap 19 of this output shaft opposition side is molded integrally formed with insulating resin 13.
The end cap 19 of output shaft opposition side has the cup-shape that is hollow cylindrical, more specifically, has: the cylindrical portion 19a of end cap, and it is at a side opening; And the flange part 19b of the ring-type of end cap, its cylinder end from open side is expanded and is formed a little to peripheral direction.The periphery footpath of the interior Zhou Jing of the cylindrical portion 19a of end cap and output shaft opposition side bearing 15b about equally, by output shaft opposition side bearing 15b being pressed into the cylindrical portion 19a of end cap, thereby output shaft opposition side bearing 15b is also fixed on insulating resin 13 by the end cap 19 of output shaft opposition side.
By such formation, the outer ring side of output shaft opposition side bearing 15b is partly securely fixed in the end cap 19 of metal output shaft opposition side, therefore, can suppress to be for example called as the caused undesirable condition of phenomenon of creep (Creep).In addition, the periphery footpath of the periphery footpath specific output axle opposition side bearing 15b of the flange part 19b of end cap is slightly large.
That is, the periphery footpath of the periphery footpath specific output axle opposition side bearing 15b of the flange part 19b of end cap is large, and at least little than the periphery footpath of rotary body 30.The end cap of output shaft opposition side 19 is formed to such shape, and thus, the periphery that for example surpasses rotary body 30 with flange part expands to the structure of stator 10 and compares, and can suppress the use of the metal material that cost is high.
Then,, for output shaft side bearing 15a, the end cap 17 of the periphery footpath that utilizes periphery footpath and stator 10 output shaft side is about equally fixed.The end cap 17 of output shaft side is circular plate shape roughly, the periphery footpath that there is diameter and output shaft side bearing 15a at the central portion of plectane protuberance about equally, and the inner side of this protuberance is hollow.Built-in after printed base plate 18, in such a way the end cap of output shaft side 17 is pressed into stator 10 and forms this brushless motor,, the inside portion of the protuberance of the end cap 17 of such output shaft side is partially pressed into output shaft side bearing 15a, and makes connection end that the periphery at the end cap 17 of output shaft side arranges and the connection end tabling of stator 10.
Utilize such structure, can realize the facilitation of assembling operation, and the outer ring side of output shaft side bearing 15a is partly fixed on the end cap 17 of metal output shaft side, therefore also can suppress the problem that creep brings.
(embodiment 1)
Fig. 2 is near the structure cutaway view of bearing 15 of embodiment 1 of the present utility model.Bearing 15 has used JIS (Japanese Industrial Standards, Japanese Industrial Standards) to be numbered 608 single-groove grooved ball bearing.And as mentioned above, bearing 15 is both sides dust-protection types.
In addition, Fig. 3 is that the thrust plate 60 of embodiment 1 of the present utility model is assembled in the stereoscopic figure before engine.
As shown in Figure 2, bearing 15 is so-called ball bearings, has: inner ring 41; Rolling element 42, it is disposed at the peripheral part of this inner ring 41; And outer ring 43, itself and inner ring 41 clamp these rolling elements 42.And bearing 15 has a pair of dust excluding plate 44 that covers rolling element 42 both sides.The thrust plate 60 in the residing side of bearing 15 of rotor 14 in addition, with circular shape as shown in Figure 3.As shown in Figure 2, thrust plate 60 is fixed on rotating shaft 16, by rotating shaft 16, is electrically connected to inner ring 41.And brushless motor 100 is configured to dust excluding plate 44 and is axially facing mutually with thrust plate 60.
In bearing 15, the fixing also supporting shaft 16 of inner ring 41.On the other hand, end cap 17, end cap 19 are fixed in outer ring 43.In addition, rolling element 42 is balls, in circle-shaped mode of surrounding rotating shaft 16 along circumferentially disposing a plurality of rolling elements 42.Above-mentioned a plurality of rolling element 42 rolls in the groove of track that is arranged at inner ring 41 and outer ring 43, and thus, the rotating shaft 16 of being fixed on inner ring 41 is freely rotated.And in the bearing 15 as single-groove grooved ball bearing, the groove of this track has the cross section of the circular arc that the radius of radius ratio rolling element 42 is slightly large.And, in the axial both sides of rolling element 42, dispose respectively the dust excluding plate 44 that forms circular shape.
As the shape of Fig. 2, dust excluding plate 44 consists of the 44b of whirlpool portion of the outer diameter part of the 44a of flat shape portion and the 44a of flat shape portion, and the 44a of this flat shape portion is the planar portions that to form from end on observation be circular shape.And the circumferentia of the 44a of flat shape portion is faced mutually with the circumferentia of thrust plate 60.In addition, utilize the 44b of whirlpool portion to be electrically connected between dust excluding plate 44 and outer ring 43.In addition,, in Fig. 2, the position that becomes the 44a of flat shape portion periphery is made as to periphery 50.That is, as known from Fig. 2, compare with the diameter of the periphery 50 of dust excluding plate 44, the external diameter of thrust plate 60 is larger.That between dust excluding plate 44 and thrust plate 60, faces mutually in addition, is spaced apart 50 μ m.Utilize above such structure, make under the state not being electrically connected to, to face mutually between dust excluding plate 44 and thrust plate 60.
So, dust excluding plate 44 and thrust plate 60 are states of connectorless each other, and dust excluding plate 44 now and the static capacity between thrust plate 60 are 15pF.In the present embodiment, 1 motor uses 2 bearings 15 and 2 thrust plates 60, and therefore, the total static capacity between dust excluding plate 44 and thrust plate 60 is 30pF.
The static capacity of the bearing 15 that the present embodiment is used between inner ring 41 and outer ring 43 is that 2 bearings 15 amount to 80pF.In the situation that having used thrust plate of the present utility model 60, add the total static capacity 30pF between dust excluding plate 44 and thrust plate 60, the inner ring 41 of 2 bearings 15 and the static capacity between outer ring 43 have reached 110pF.
Fig. 4 represents inner ring 41 and the variation of static capacity between outer ring 43 and the relation between the variation of shaft voltage of the bearing 15 of present embodiment.In the situation that not using thrust plate of the present utility model 60, shaft voltage is 5.5V, and the inner ring 41 of bearing 15 and the static capacity between outer ring 43 are 80pF.
As shown in Figure 4, by using the thrust plate 60 of embodiment 1, the inner ring 41 of bearing 15 and the static capacity between outer ring 43 reach 110pF, and therefore, shaft voltage becomes 4.0V, can make shaft voltage reduce 1.5V.And, if reduce shaft voltage, in bearing inside, cause the energy that produces galvano-cautery to diminish, thereby can prevent the noise that caused by galvano-cautery.
In addition, thrust plate 60 is fixed and is held in inner ring 41 and the rotating shaft 16 of bearing 15, also has the function of bearing the thrust load that puts on bearing 15.Conventionally, these bearings of motor use the metallic plate of the E type shape that is called as E ring, carry out the thrust load of block bearing.Yet common E ring is such structure, that is, to compare with the periphery 50 of the 44a of flat shape portion of dust excluding plate 44, external diameter is quite little, and the interval of leaving between E ring and dust excluding plate is more than 200 μ m.Therefore, the static capacity between E ring and dust excluding plate is very little.
The dust excluding plate 44 of bearing 15 and the interval between thrust plate 60 are most suitable between 50 μ m～100 μ m.In the situation that dust excluding plate 44 is larger than 100 μ m with the interval of thrust plate 60, the same with common E ring, the static capacity between dust excluding plate 44 and thrust plate 60 diminishes, and is difficult to obtain the effect that reduces shaft voltage.
In addition, in the situation that the interval between dust excluding plate 44 and thrust plate 60 is less than 50 μ m, when motor driven, it is large that the possibility that dust excluding plate 44 contacts with thrust plate 60 becomes, and easily produces noise, contact wear etc. extremely.
In addition, as by the parts that are intervally adjusted to 50 μ m～100 μ m between dust excluding plate 44 and thrust plate 60, there are the parts that make the 44a of flat shape portion of dust excluding plate 44 approach thrust plate 60 to adjust, in the mode of facing mutually with dust excluding plate 44, jut be set on thrust plate 60 and utilize parts that the shape of thrust plate 60 adjusts etc.
(embodiment 2)
Fig. 5 is near the structure cutaway view of bearing 15 of embodiment 2 of the present utility model.In addition, Fig. 6 is that the E type thrust plate 61 of embodiment 2 of the present utility model is assembled in the stereogram before motor.In embodiment 2, except the thrust plate of embodiment 1 60 being replaced with to E type thrust plate 61, other structure is identical with embodiment 1.That is, in the present embodiment 2, as the structure of brushless motor 100, be the structure shown in Fig. 1 in the same manner as in Example 1, bearing 15 is also the single-groove grooved ball bearing of both sides dust-protection type in the same manner as in Example 1.
E type thrust plate 61 forms the E type shape shown in Fig. 6, and the external diameter of E type thrust plate 61 is the same with thrust plate 60, larger than the external diameter of the periphery 50 of the 44a of flat shape portion of the dust excluding plate of bearing 15 44.Static capacity between dust excluding plate 44 now and E type thrust plate 61 is 10pF.In the present embodiment, 1 motor uses 2 bearings 15 and 2 thrust plates 61, and therefore, the total static capacity between dust excluding plate 44 and E type thrust plate 61 is 20pF.In the same manner as in Example 1, the static capacity between inner ring 41 and outer ring 43 is that 2 bearings 15 amount to 80pF to the bearing 15 that embodiment 2 is used.Therefore, the inner ring 41 of 2 bearings 15 in the situation that having used thrust plate 61 and static capacity between outer ring 43 are 100pF.
As shown in Figure 4, use the E type thrust plate 61 of embodiment 2, the inner ring 41 of bearing 15 and the static capacity between outer ring 43 are 100pF, so shaft voltage is 4.5V, can make shaft voltage reduction 1V.Thus, can reduce in bearing inside, to cause producing the energy of galvano-cautery, thereby can prevent the noise that caused by galvano-cautery.
E type thrust plate 61 is because of its shape, and the Area Ratio thrust plate 60 of facing mutually with the dust excluding plate 44 of bearing 15 is little with the area that the dust excluding plate 44 of bearing 15 is faced mutually.
Therefore, compare with the situation of use thrust plate 60, static capacity between E type thrust plate 61 and dust excluding plate 44 diminishes, but the method for attachment as E type thrust plate 61 to rotating shaft 16, by E type thrust plate 61 being pressurizeed to rotating shaft from the direction vertical with respect to rotating shaft 16, thereby E type thrust plate 61 and rotating shaft can be coupled together, therefore, the assemble method of thrust plate is easier.
(execution mode 2)
Below, with reference to the accompanying drawings of execution mode 2 of the present utility model.In the present embodiment, as the example of electric equipment of the present utility model, the structure of indoor apparatus of air conditioner is described.
Fig. 7 means the schematic diagram as the structure of the indoor apparatus of air conditioner of the example of the electric equipment of execution mode 2 of the present utility model.
In Fig. 7, in the housing 211 of indoor apparatus of air conditioner 200, be equipped with brushless motor 201.Cross flow fan 212 as blowing fan is installed on the rotating shaft of this brushless motor 201.Brushless motor 201 is driven by motor drive 213.By motor drive 213, switched on, brushless motor 201 rotations, cross flow fan 212 is accompanied by the rotation of brushless motor 201 and rotates.By the rotation of this cross flow fan 212, by utilize used for indoor machine heat exchanger (not shown) carry out air adjustment and after air blow indoor.Here, brushless motor 201 for example can be suitable for the brushless motor 100 shown in above-mentioned execution mode.
Electric equipment of the present utility model has brushless motor and the housing that this brushless motor carries, and adopts the brushless motor of the present utility model of said structure as brushless motor.
In the above description, embodiment as electric equipment of the present utility model, enumerated the brushless motor that is equipped on indoor apparatus of air conditioner, but, be equipped on air-conditioner outdoor unit brushless motor,, be equipped on the brushless motor of other electric equipment, the brushless motor that the brushless motor that for example various household electrical appliances are used with equipment, various information equipment carry, the brushless motor that industrial equipment uses also can be suitable for is self-evident.
As described above, motor of the present utility model has: stator, and its package has winding; Rotor, it comprises with stator practises physiognomy and is circumferentially maintaining the rotary body and the rotating shaft being connected with rotary body of permanent magnet over the ground; Ball bearing, it is with axle rotation mode supporting shaft freely; And thrust plate, it is connected with rotating shaft.And ball bearing has the dust excluding plate being electrically connected to its outer ring, thrust plate is electrically connected to the inner ring of ball bearing, and has the opposite face of facing mutually with the planar portions of the dust excluding plate of ball bearing.
In addition, electric equipment of the present utility model is equipped with above-mentioned motor.
The utlity model has such structure, can reduce shaft voltage, therefore, can provide the motor and the electric equipment with this motor of the galvano-cautery noise that has suppressed bearing.
And motor of the present utility model is the motor that can suppress bearing generation galvano-cautery, the motor that the equipment such as indoor apparatus of air conditioner of the cheap of major requirement motor and high life are carried is useful.
Claims (4)
1. a motor, it has: stator, its package has winding; Rotor, it comprises with said stator practises physiognomy and is circumferentially maintaining the rotary body and the rotating shaft being connected with above-mentioned rotary body of permanent magnet over the ground; Ball bearing, it supports above-mentioned rotating shaft in above-mentioned rotating shaft rotation mode freely; And thrust plate, it is connected with above-mentioned rotating shaft, and this motor is characterised in that,
Above-mentioned ball bearing has the dust excluding plate being electrically connected to its outer ring,
Above-mentioned thrust plate is electrically connected to the inner ring of above-mentioned ball bearing, and has the opposite face of facing mutually with the planar portions of the dust excluding plate of above-mentioned ball bearing.
2. motor according to claim 1, is characterized in that,
Comprise following structure: the external diameter of above-mentioned thrust plate is greater than the external diameter of planar portions of the dust excluding plate of above-mentioned ball bearing.
3. motor according to claim 1, is characterized in that,
Comprise following structure: the distance between the dust excluding plate of above-mentioned ball bearing and above-mentioned thrust plate is 50 μ m～100 μ m.
4. an electric equipment, is characterized in that,
Be equipped with the motor described in any one in claim 1～3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013150070A JP2015023681A (en) | 2013-07-19 | 2013-07-19 | Electric motor and electrical machine |
| JP2013-150070 | 2013-07-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203967881U true CN203967881U (en) | 2014-11-26 |
Family
ID=51928425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420401245.0U Expired - Lifetime CN203967881U (en) | 2013-07-19 | 2014-07-18 | Motor and electric equipment |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2015023681A (en) |
| CN (1) | CN203967881U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3062422A1 (en) * | 2015-02-25 | 2016-08-31 | Toyota Jidosha Kabushiki Kaisha | Electric motor storing device for hybrid vehicle |
| RU2646866C1 (en) * | 2016-01-15 | 2018-03-12 | Тойота Дзидося Кабусики Кайся | Stator and electric engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6547006B2 (en) * | 2015-11-24 | 2019-07-17 | 株式会社日立産機システム | Axial gap type rotating electrical machine and stator for rotating electrical machine |
-
2013
- 2013-07-19 JP JP2013150070A patent/JP2015023681A/en active Pending
-
2014
- 2014-07-18 CN CN201420401245.0U patent/CN203967881U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3062422A1 (en) * | 2015-02-25 | 2016-08-31 | Toyota Jidosha Kabushiki Kaisha | Electric motor storing device for hybrid vehicle |
| US10116182B2 (en) | 2015-02-25 | 2018-10-30 | Toyota Jidosha Kabushiki Kaisha | Electric motor storing device for hybrid vehicle |
| RU2646866C1 (en) * | 2016-01-15 | 2018-03-12 | Тойота Дзидося Кабусики Кайся | Stator and electric engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015023681A (en) | 2015-02-02 |
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