CN104791257B - Structure improving device for permanent magnet canning pump - Google Patents

Abstract

The invention provides a structure improving device for a permanent magnet canning pump. The device is mainly used for plastic or plastic linings. Through a rigidity enhancing method of the device, a rear cover shaft hole seat of the pump and a metal rear frame shaft supporting seat axially extend in the space in the inner diameter direction of a main yoke of a motor rotor, the shaft supporting seat is tightly combined with the shaft hole seat to enhance the rigidity of a fixing shaft and reduce the length of the force arm of the force moment of load force, the rear cover shaft hole seat can be provided with a sensor according to requirements, the sensor is structurally composed of a secondary magnet set and a sensing assembly system, closed-loop magnetic force lines exist between the secondary magnet set and the sensing assembly system, and the secondary magnet set is installed on the inner side of the main yoke of the motor rotor, is opposite to a primary magnet set, and is packaged together with the motor rotor. The sensing assembly system is composed of a secondary yoke and a sensing assembly. When the motor rotor rotates, the sensing assembly cuts the magnetic force lines to output induction electric signals and is installed in an annular groove of the rear cover shaft hole seat so as to be protected by a rear cover. The sensing assembly can be multiple induction coils or multiple Hall assemblies and the like and is used for monitoring the bearing abrasion condition or meeting the drive requirement.

Description

Permanent magnetism canning pump configuration improved device

The application is the divisional application of Application No. 2011103300199

Technical field

Shaftless sealed cans armored pump is made of one for motor with pumping, and its motor rotor and stator coil are all Jing corrosion-resistant materials Material encapsulation isolation protection, and be directly to contact with conveying liquid, the drive motor of shaftless sealed cans armored pump can divide into sense Motor is answered, canned pump is hereinafter referred to as sensed, and permanent magnet motor, hereinafter referred to as permanent magnetism canning pump, in the work of many zero leakage demands Industry purposes is gradually user attention, is especially containing the chemical liquids such as toxic, inflammable, high corrosion, in addition, shaftless sealed cans armored pump Rotor be directly contact conveying liquid, majority from abrasion performance ceramic material sliding bearings, such as graphite, aluminium oxide, charcoal SiClx etc., but bearing wear can cause rotor eccentricity to operate, and fixed axle structure must endure as higher centrifugal force and its torque, And cause rotor and sealed cans bonnet mutually to rub damage and leakage failure so that the structure of motor axle system become design focus it One, common method is installing bearing wear monitoring device under the high-reliability demand of zero leakage.

Therefore, this creation is the permanent magnetism canning pump configuration improved device of plastics or plastic inner lining, and purpose is promoting fixing axle Structural rigidity and sensor can be installed, such as bearing wear monitoring device.

Background technology

The canned pump system of metal sensing is with extremely low magnetic conduction and anti-corrosion sheet metal cylindrical shape sealed cans turn encapsulating motor Son and stator, sealed cans system is installed in diameter of stator bore face for completely cutting off liquid and stator coil, and cage rotor surface is also with gold Metal thin plate encapsulates to completely cut off liquid, therefore the air gap of motor is to rotor teeth portion stalloy surface by stator teeth stalloy surface Monolateral radial distance, total width of air gap is most to be less than 3mm, and motor characteristic is small air gap motor configuration；In cleaning non-corrosiveness Liquid conveying also needs shaftless sealed cans armored pump purposes, such as car engine cooling water pump, often using high temperature resistant but corrosion resistance it is restricted it Making, such as PPS is encapsulating motor stator and motor rotor, and the corrosion-free nargin of its package thickness is monolateral for heat resistant plastic material More than 1.5mm, total width of air gap is usually above more than 4mm so that motor characteristic is high air gap motor configuration；Meeting high poison Property, the conveying of highly corrosive chemical liquid, such as Fluohydric acid., it is necessary to the corrosion resistant of intensity is easily reduced during using temperature more than 85 DEG C Erosion plastic structural part or liner, such as PP, fluorine resin material encapsulating motor stator and motor rotor, due to corrosion-resistant plastic The use of material so that the structural strength of motor axle system becomes design one of focus, and in motor rotor system also therefore Rotary shaft and fixing axle are divided into, this creation proposes preferred version for Fixed-axis system, because package thickness contains corrosion allowance Monolateral more than 3mm, total width of air gap is usually above more than 7mm so that motor characteristic is high air gap motor configuration, therefore, permanent magnetism Syncmotor is the preferable selection of high air gap motor, although shaftless envelope canning pump has used ceramic material sliding bearing, It is that bearing still can wear and tear because of reasons such as bearing wear, anhydrous idle running, too high vibrations, therefore, monitoring bearing wear is installed Sensor is promoting its reliability for necessary means；In addition, the sensor of this creation can also select Hall subassembly so that permanent magnetism The type of drive of canned pump can also be using there is sensor to drive, to reduce to particular drive in addition to sensorless drive Dependence contributes to the convenience of user equipment apolegamy；

Following citation case is for the known solution of shaftless sealed cans armored pump, comprising fixed axle structure, without sensor Drive and have the scheme such as sensor driving and bearing wear monitoring, the related citation case of known techniques is described as follows：

Citation case one：

The structural improvement of Taiwan Patent TWM369391 permanent magnetism canning pumps in 2009, is applied to corrosion-and high-temp-resistant purposes, Its motor configuration is cantilever fixed axle structure but motor is the design of radial air gap internal rotor, and the package thickness of this citation case contains corrosion Nargin, its one-sided thickness is the total width of air gap 8mm of 3mm, calculates position of magnetic pole using sensing assembly method and drives permanent magnetism horse Reach, using rigid composite fixed axle structure high temperature, high pass filter number purposes are met；But the structure bearing-free abrasion prison of this citation case Brake.

Citation case two：

Japan Patent JP2005344589A-CANNED MOTOR PUMP in 2005, are applied to the permanent magnetism tank of engine cooling Armored pump, it is simple fixed axle structure that this citation case is small-power pumping, and pottery magnetic axis is fixed by heat resistant plastice supports, containing three Foot rest and pumping bonnet, the inner diameter volume in main magnet yoke portion is equiped with secondary Magnet and Hall component, for detecting magnetic pole position Put to drive permanent magnet motor, the Hall component is axially extended by bonnet bottom, and rotor magnet length also extend to axial with Reduce the axial elongation of independent Hall component；The load that cleaning liquid conveying is increased regardless of bearing wear, using letter Single fixed axle structure, but increase magnet length can increase cost, and the magnetic line of force that can only detect magnet surface diffusion is unfavorable for magnetic pole Detect exact position.

Citation case three：

Japan Patent JP2008220008A--BRUSHLESS MOTOR AND FLUID PUMP DEVICE in 2008, should For the permanent magnetism canning pump of engine cooling, it is simple fixed axle structure that this citation case is small-power pumping, and pottery magnetic axis is by resistance to thermoplastic Material supports are fixed, and containing spider and pumping bonnet, in back cover of motor bottom, exterior measuring is equiped with Hall subassembly and its driving Circuit board, for detecting position of magnetic pole to drive permanent magnet motor, magnet length is axially prolonged to make the close Hall subassembly of its tail end, and Magnet tail end is processed into inclined-plane, makes oblique injection of magnetic power pass through installing Hall component on circuit boards to improve magnetic pole Position detects precision；The load that cleaning liquid conveying is increased regardless of bearing wear, using simple fixed axle structure, but increases Plus magnet length can increase cost, the magnetic line of force that can only detect the oblique diffusion of magnet surface is unfavorable for that magnetic pole exact position is detected.

Citation case four：

United States Patent (USP) US4211973A-Apparatus for detect ing faul ts to be in 1980 Occurred or initially existing in a running electric rotary machine, are applied to sense Canned pump is answered, the length of its induction coil is to cover the thick total length of stator product, and induction coil can export periodicity induced voltage, wrap Containing with line lock main flux induced voltage and the rotor induced harmonics voltage that caused by rotor slippage, can make when bearing wear Into the micro change of size of gaps, this change also can be reflected on the induced voltage of coil output, when two in stator teeth The coil of fractional radial position, its output voltage values can leave behind periodic harmonic voltage because subtracting each other, when bearing wear makes to turn When son occurs eccentric operating, the value of periodic harmonic voltage can increase, it is adaptable to radial air gap induction motor and axial air-gap sense Answer motor, this method also simultaneously can with monitoring motor power issue or coil problem itself, such as three imbalances the problems such as, But this case is only applicable to the journal bearing wear monitoring of induction motor, monitor not comprising axial thrust bearing abrasion.

Citation case five：

1999 United States Patent (USP) US5926001A-Canned motor bearing wear moni toring device, It is applied to sense canned pump, its device is respectively to make four in the end tooth portion internal side diameter space angle margin 90 of stator two to amount to two groups Eight seam caves, allow the end of stator two to have eight independent teeth portion and install induction coil, and the corresponding seam cave in the end of stator two has identical Space angle, eight groups of coils can sense bearing radially abrasion, axially abrasion and incline the functions such as abrasion；

Citation case six：

1999 United States Patent (USP) US5955880A-Sealless pump rotor position and bearing Monitor, is applied to sense canned pump, is the high frequency excitation coil using a group of two opposite polarity coils and yoke composition Group, the coil group is fixed on sealed cans outer surface side by side by yoke, and the axial location on the outside of the end of stator two, the coil group its The magnetic line of force can first pass through sealed cans and enter the end outer space of rotor two, and the disk via the side of rotor two in rotating shaft is led Magnetic material, then the closed magnetic circuit that opposite polarity coil constitutes radial direction is returned to by Jing sealed cans are spatially steered, that is, permeability magnetic material with Coil group be concentric position relation, coil be with three lines and around a coil for high frequency excitation it is another two as induction coil, One of this two-lines circle bar radially sense another coil as axial sensing for doing, when monolateral bearing has radially abrasion, The radial position of disk can produce radial deflection, can cause disk can closer to or leave coil group, that is, the magnetic resistance of magnetic circuit Can change, that is, the output voltage of coil group can change, when same axial location is equiped with space angle each other During 90 degree of 4 coil groups, it is possible to the radial direction abrasion of bearing are detected, when the side axle end of rotor two is all equiped with coil group and circle During disk, it is possible to increase the detecting of axial displacement, it is using the voltage signal of the end-coil of rotor two that axially the signal of sensing is processed Compare, to calculate the axial displacement of rotor, in addition, 1K-4K high-frequency signals can avoid the original coil harmonic wave of motor Signal is disturbed, in addition, disturbing this citation case to increase magnetic conduction isolating device in stator coil tail end to reduce harmonic wave.

Citation case seven：

United States Patent (USP) US6114966A--Motor having a bearing wear monitoring in 2000 Device, is applied to sense canned pump, although this citation case is expressly noted that to install plural induction coil additional in the front and back end of stator true The axial direction abrasion of detecting bearing can be reached in fact, but motor maintenance may change stator, rotor, axle center and induction coil, this When stator and the mechanical axially position of rotor possibly cannot be consistent with electric axially position, or induction coil again coiling differs Cause, it will cause the great exception of signal, that is, detector to must be able to adjust relative position and axially abrasion signal zero, Its method is exactly that rotor has the product slightly long compared with stator thick, during assembling in shaft end side rotor end-face relative to stator faces apart from necessary Confirm, rotor end-face alignment hub of a spool, the slightly long long-pending thickness of rotor stretches out stator breech face, and rotor tail end is fully contemplated by coil simultaneously There is axial enough and to spare, rotor reach when current thrust bearing weares and teares, and front end coil signal changes more apparent, but the coil news of tail end Number variation is relatively low；

Citation case eight：

United States Patent (USP) US6429781B2-Axial bearing wear detector device in 2002 Canned motor, are applied to sense canned pump, and it is that space angle 180 degree is corresponding that its device is one group of coil, containing stator one Two coils of teeth portion full width, two coils of one group of coil group two ends containing stator teeth portion, although this citation case is expressly noted that The front and back end of stator install additional plural induction coil can reach really detecting bearing axial direction wear and tear, but wear ring before and after motor Axial length it is longer than the axial length of thrust bearing before and after rotor, rotor can between Qian Hou the wear ring free axial position Shifting ± 2.5mm, bearing axially wears away normal axial displacement and abnormal abrasion displacement that detector has to differentiate between out rotor, Namely must be able to really detect the actual abrasion loss of bearing, this citation case is come using a reference circuit and a dead point circuit Sensing coil signal is respectively compared out, is no in normal range to distinguish rotor axial displacement.

Citation case nine：

United States Patent (USP) US7019661B2-Axial abrasion detector of bear ing in 2006 Canned motor, are applied to sense canned pump, and using the identical coil method for sensing of citation case eight, this citation case is expressly noted that Although installing plural induction coil additional in the front and back end of stator can reach the axial direction abrasion of detecting bearing really, signal is being zeroed Attrition value can be obtained really afterwards, but induction coil output voltage signal value usually can be affected by motor running voltage and be had Transport phenomena, causes the difficulty of signal flyback action, that is, bearing wear to be worth incorrect, the method that the case proposes signal process With device, signal can be zeroed really.

The canned pump of sensing more than comprehensive can be divided into following three with the structural solutions of permanent magnetism canning pump：

1st, install sensor increases pumping reliability to monitor bearing；

2nd, install Hall subassembly and drive pumping but palpus lengthening Magnet to facilitate；

3rd, improve fixing axle rigidly to increase pumping reliability.

The various problems for being proposed and its solution have its exploitativeness, but these schemes and cannot meet simultaneously Improving fixing axle rigidity can install sensor to improve the demand of reliability again, and the structural improvement of the permanent magnetism canning pump of this creation must Problems with must be overcome：

Problem 1：The intensity weakness of material itself

Improve corrosion-resistant plastic structural member or liner when structural rigidity enable avoids temperature more than 85 DEG C to be easily reduced by force The problem of degree, can also increase pumping reliability under without sensor；

Problem 2：Bearing wear monitoring requirements

Meet high toxicity, the demand for security of highly corrosive chemical liquid conveying, installing sensor can be used to continue to monitor Bearing wear state is lifting pumping reliability；

Problem 3：The inexpensive demand of high air gap motor characteristic

Permanent magnet motor is the preferable selection of high air gap motor, but need to directly extend main magnet in a large number using expensive Magnet Length providing inductive component signal source, then Magnet cost relative increase；

Problem 4：Avoid the harmonic wave interference of the high-frequency PWM driving of permanent magnet motor.

The structure of sensor must be avoided that the harmonic wave interference of high-frequency PWM driving；

Problem 5：Using signal quality requirement during sensor.

There are larger axially free displacement space, the magnetic line of force point of sensor in the rotor of the canned pump of highly corrosion resistant purposes Cloth is easier deviation and signal must avoid the difference because supplying voltage from causing the drift of signal；

Problem 6：Easily keeped in repair and renewal part

Maintenance renewal part must can avoid the problem produced because of positioning and other anthropic factors；

The structural improvement of this creation makes the permanent magnetism canning pump of various power brackets under reasonable cost, can strengthen it and fix Axle rigidity simultaneously can install sensor on demand, reach enhancement reliability and the purpose for increasing the service life, it is adaptable to simple fixed Axle construction and Relationship for Compound-Axis Structure.

The content of the invention

Permanent magnetism canning pump configuration improves main purpose and is promoting fixing axle rigidity and installing sensor, such as Bearing Grinding on demand Consumption monitoring device and other sensors, to promote pumping reliability and other demands, in the application in the face of high temperature, high corrosion processing procedure During demand, solution is described as follows：

The quantity of secondary group of magnets is identical with main magnet group；Secondary Magnet system is installed on the main yoke internal diameter of motor rotor Near one end of bonnet bottom, and install back to main magnet, its pole orientation is with main magnet group conversely, sealing together with motor rotor It is filled with and avoids medicinal liquid from corroding；The axial length of secondary Magnet is at least what motor rotor axial displacement length axially wore away containing bearing Two times；Its magnetic line of force is projected through air gap by secondary magnet surface and reaches secondary yoke, then via secondary yoke return to originally The secondary Magnet of other adjacent, and return to original secondary Magnet via main yoke and constitute closed sensing magnetic circuit；So that sensing Both main magnetic circuits magnetic line of force of magnetic circuit and main magnet coexists in main yoke, that is, the magnetic line of force of sensor is through main yoke but not It is disturbed；

Sensing component system includes secondary yoke with plural inductive component, and sensing component system is installed in magnetic conduction sensing component Property ring-like secondary yoke surface and Jing insulant be packaged into a component, and be installed within the boss of bonnet bottom with every Liquid is conveyed absolutely；Secondary yoke internal diameter is fixed on axle support base external diameter；And the trailing edge of secondary yoke is provided with electrical angle positioning Point, the anchor point system links the axle center anchor point of the axle support base of motor after-frame, and links motor stator coils winding Electrical angle anchor point；The edge axially back and forth of secondary Magnet is axially moved all without the axial range beyond secondary yoke；Often One sensing component cutting magnetic line under motor rotor rotation can export induced voltage signal.

Wherein, the quantity of induction coil is at least the even number of 4, and the axial length of induction coil is not less than secondary magnet shaft Limit value is worn away containing thrust bearing to displacement to length plus upper rotor part free axle, the circumferential width of induction coil is not more than electrical angle 180 degree.

Wherein, the inductive component of sensing component is induction coil, and sensing component is by secondary yoke and plural induction coil Composition, plural inductive coil series installing is arranged in annular secondary yoke surface, and induction coil is divided into coil α in circumferencial direction With bis- groups of coil β, and 90 degree or 270 degree are differed in electrical angle；The electric angle positioning of induction coil and space angle positioning system Reached by the electrical Location point positioned at secondary yoke, changed with the maintenance for facilitating sensing component.

Wherein, the axial length of the secondary Magnet of half, the axle of induction coil are at least covered when each induction coil is arranged Include before and after arranged adjacent, be staggered front to back arrangement and space angle 180 degree arranged opposite to arrangement mode, or above-mentioned arrangement side The combination of formula.

Wherein, the axial length of secondary yoke is more than the axial overall length and its leading edge and trailing edge energy after induction coil arrangement Its induction coil, and the secondary Magnet axial displacement range of motor rotor are fully contemplated by without departing from the axial length of secondary yoke.

Wherein, the inductive component of sensing component is plural induction coil and plural Hall component, plural inductive coil series dress Annular secondary yoke surface is located at, and induction coil is divided into coil α and bis- groups of coil β in circumferencial direction, and in electrical angle phase Differ from 90 degree or 270 degree；Electric angle positioning and the space angle of induction coil is positioned by the electrical Location point positioned at secondary yoke To reach, changed with the maintenance for facilitating sensing component, 3 Hall subassembly electrical angles differ 120 degree, the Hall group of intermediate position Part is placed exactly in the electrical angle center of the inside of one of induction coil, and is aligned with secondary Magnet axial centre, remaining 2 Hall subassembly is then positioned at 120 degree of the electrical angle in both sides external interval of the induction coil.

Wherein, the inductive component of sensing component is plural induction coil, can go out motor rotor via calculation of lightning induced voltage Axial direction and radial displacement and angle.

This creation is directed entirely to the problems referred to above and provides preferred plan to meet user demand, and its novelty is described as follows：

Countermeasure 1：Permanent magnetism canning pump configuration improves purpose in the structural rigidity for promoting fixing axle and can install sensing on demand Device, the method that its fixing axle is rigidly promoted axially stretches into motor rotor in the after-frame axle support base of the metal structure for making motor after-frame The inner diameter volume of main yoke is simultaneously completely cut off corrosive liquid by the boss of bonnet, and axle support base combines closely boss with longer axle Grip length to promote fixing axle rigidity, and the torque torque arm length of multi-load strength can be shortened, fixing axle is rigidly promoted will Improve structural reliability.

Countermeasure 2：The inner diameter volume of main yoke enables bonnet boss to have the space of installing sensor, such as bearing wear prison Survey device to promote pumping reliability, the structure of sensor is made up of secondary group of magnets and sensing component, and therebetween With the presence of the loop circuit magnetic line of force, secondary Magnet system is installed on the main yoke inner side of rotor and seals together with rotor back to main magnet group It is filled with and avoids medicinal liquid from corroding, sensing component is made up of secondary yoke and sensing component, and sensing component is arranged on bonnet axis hole Protected by bonnet in the cannelure of seat, sensing component can be plural induction coil for monitoring bearing wear.

Countermeasure 3：The sensor of the inner diameter volume of main yoke includes secondary group of magnets and sensing component, and secondary group of magnets only has Main magnet volume can reduce Magnet cost, in addition, under high capacity less than 1/10th than directly lengthening main magnet length Often can be held using longer axis, at this moment fitted bearing length can just install secondary group of magnets the length that increases main yoke.

Countermeasure 4：The magnetic line of force produced by high-frequency PWM driving power supply for be input to stator coil by converter and harmonic wave will The main magnetic circuit being made up of main yoke is turned on, and the sensor of this creation is installed on main yoke inner diameter volume by by main yoke Protection；The secondary group of magnets quantity of sensor is equal with main magnet group and is installed on the main yoke of rotor inner side back to main magnet Group so that sensing magnetic circuit coexists in main yoke, that is, the magnetic line of force of sensor through main yoke with both main magnetic circuits magnetic line of force But it is interference-free；Sensing its magnetic line of force of magnetic circuit is projected through air gap by secondary magnet surface and reaches secondary yoke, then via secondary Yoke is returned to and original other adjacent secondary Magnet, and is returned to original secondary Magnet via main yoke and constituted closed magnetic Road；Sensing component exports induced voltage signal by cutting magnetic line when rotor rotates, therefore voltage signal is independent not by outside Voltage disturbance.

Countermeasure 5：The axial length of independent sensor its annular secondary yoke in addition to the axial length of secondary Magnet is covered, Rotor axial movable length is further included, and is also covered by length of the induction coil axially needed for arrangement, the axle of each induction coil To more than 60% that length is secondary Magnet axial length, the axial overall length after arrangement is added more than secondary Magnet axial length Rotor axial free displacement length, that is, sensing magnetic circuit can stably movement have deviation situation and can increase with rotor operating Signal degree of stability, is less disturbed by outer power voltage, the induction coil for arranging axially back and forth its cutting magnetic line of force quantity with Rotor axial displacement or abrasion are linear, and its induced voltage of the induction coil of radial direction 180 degree is in radial displacement or abrasion Linear relationship.

Countermeasure 6：The trailing edge of secondary yoke is provided with an electrical angle anchor point, and the anchor point system links the axle of motor after-frame and supports Anchor point directly over the axle center of seat, and link the electrical angle reference point of coil windings when motor stator is arranged on center, sense The sensing component that component and yoke are packaged as a whole is surveyed, easily and can guarantee that electrical Location is correct when maintenance is changed.

This creation will be with having structure and whether install sensor is described further, but other may achieve identical effect Design is not limited with the following example：

1st, the canned permanent magnet pump without sensor：

Pumping need to be driven using sensorless drive device；

(a) simple fixing axle：The general service of misgivings, the bonnet axle for axially stretching into are worn away suitable for high-low power bearing-free Hole seat and axle support base shorten the torque torque arm length of multi-load strength, and make fixation by axle support base boss of combining closely Axle is rigidly improved.

B () is combined fixing axle：Using high power, high temperature, low NPSHr purposes that misgivings are worn away in bearing-free, axially stretch into Bonnet boss and axle support base can shorten the torque torque arm length of multi-load strength, its Ceramic shaft sleeve by metal shaft it Rounded nose tightly locks compression with the compressing surface of axle support base, cantilevered axle is rigidly improved.

2nd, has the canned permanent magnet pump of bearing wear monitoring：

Pumping need to be driven using sensorless drive device；

(a) simple fixing axle：There is the general service of bearing wear misgivings suitable for high-low power, the bonnet axle for axially stretching into Hole seat and axle support base shorten the torque torque arm length of multi-load strength, and make fixation by axle support base boss of combining closely Axle is rigidly improved；The secondary group of magnets of sensor is installed on the main yoke inner side of rotor back to main magnet group, the sensing of sensor Component is made up of secondary yoke and induction coil, in the cannelure of bonnet boss, and is tightly fixed to axle support base It is upper to be used for monitoring bearing wear；Longer bearing can be used especially in heavy duty demand, can suitably increase main yoke length To coordinate to install secondary group of magnets.

B () is combined fixing axle：Using in the high power, high temperature for there are bearing wear misgivings, low NPSHr purposes, axially stretch into Bonnet boss and axle support base can shorten the torque torque arm length of multi-load strength, its Ceramic shaft sleeve by metal shaft it Rounded nose tightly locks compression with the compressing surface of axle support base, cantilevered axle is rigidly improved, and the secondary group of magnets of sensor is installed on Back to main magnet group, the sensing component of sensor is made up of secondary yoke and induction coil, is arranged on for the main yoke inner side of rotor In the cannelure of bonnet boss, and it is tightly fixed on axle support base for monitoring bearing wear；Especially in heavy duty demand When can use longer bearing, can suitably increase main yoke length to coordinate secondary group of magnets is installed.

3rd, sensor construction：

The structure of sensor is made up of secondary group of magnets and sensing component, and secondary Magnet system is installed on the master of rotor Back to main magnet group, sensing component is made up of secondary yoke with plural induction coil, installed in axially extending for yoke inner side It is used for monitoring bearing wear in the cannelure of bonnet boss, at this moment must uses the driver without sensor to drive, works as sensing When component is simultaneously using Hall component with induction coil, can also be driven from the driver for having sensor.

Description of the drawings

Fig. 1 (A)：This creation permanent magnetism canning pump is the generalized section of the bilateral support fixed axle structure for having sensor.

Fig. 1 (B)：This creation permanent magnetism canning pump is that the section of the monolateral supporting cantilever Relationship for Compound-Axis Structure without sensor is illustrated Figure.

Fig. 1 (C)：This creation permanent magnetism canning pump is that the section of the monolateral supporting cantilever Relationship for Compound-Axis Structure for having sensor is illustrated Figure.

Fig. 1 (D)：This creation permanent magnetism canning pump is the bilateral support fixed axle structure for having sensor, using lengthening bearing The generalized section of structure.

Fig. 2：This creation first embodiment motor rotor and the integral generalized section of impeller.

Fig. 3 (A)：The generalized section of the pumping bonnet of this creation bilateral support fixing axle.

Fig. 3 (B)：The generalized section of the pumping bonnet of this creation cantilever fixing axle.

Fig. 4 (A)：The axial direction of this creation bilateral support fixing axle grips the generalized section of length L.

Fig. 4 (B)：The axial direction of this creation cantilever fixing axle grips the generalized section of length L.

Fig. 5 (A)：This creation motor rotor is illustrated in the section of bilateral support fixing axle multi-load stress and its moment of torsion Figure.

Fig. 5 (B)：This creation motor rotor is illustrated in the section of side cantilever fixing axle multi-load stress and its moment of torsion Figure.

Fig. 6 (A)：This creation motor bearing wears away the radial section schematic diagram of monitoring device.

Fig. 6 (B)：The section axial direction schematic diagram of this creation bearing wear monitoring device.

Fig. 6 (C)：This creation uses the monitoring device schematic diagram of the bearing wear of 8 induction coils.

Fig. 6 (D)：This creation bearing wear monitoring device 3D schematic diagram (one).

Fig. 6 (E)：This creation bearing wear monitoring device 3D schematic diagram (two).

Fig. 6 (F)：This creation uses the monitoring device schematic diagram of the bearing wear of 4 induction coils.

Fig. 7：This creation permanent magnetism canning pump sensor is equiped with the schematic diagram of Hall subassembly.

1：Permanent magnetism canning pump 3：Fixing axle 3a：Fixing axle

31：Spider 32：Metal shaft 321：Rounded nose

322：Plastic, rubber-coating 323：Spiro tooth part 33：Axle sleeve

331：Thrust anchor ring 332：Centre bore 333：Front end face

4：Pump protecgulum 4a：Pump protecgulum 4b：Liner

41：Bonnet 41a：Bonnet 411：Flange portion

412：Cylindrical portion 413：Boss 413a：Axis hole

413b：Cannelure 414：Thrust ring 415：Room space

418：Boss 418a：Centre bore 418b：Inward recess

418d：Sealing surface 44：Entrance 45：Outlet

46：Thrust ring 47：Flow channel space 5：Impeller

5a：Impeller 52：Impeller boss 53：Thrust bearing

54：Impeller hub bore 54a：Impeller hub bore 55：Impeller boss plate

6：Flow direction 61：Flow direction 62：Flow direction

65：Flow direction 7：Motor rotor 71：Main magnet group

71a：Main magnet 71b：Main magnet 72：Main yoke

73：Secondary group of magnets 73a：Secondary Magnet 73b：Secondary Magnet

73c：Secondary Magnet 73e：Leading edge 73f：Trailing edge

73g：Center 74：Rotor encapsulated 76：Axially-extending portion

79：Bearing 8：Canned motor 81：Motor center

811：Flange 82：Motor after-frame 821a：Axle support base

821b：Axle support base 821c：Axle support base 821d：Axle support base

822：Power cable outlet 823：Protuberance 83：Stator

83a：Teeth portion 83b：Yoke portion 83c：Teeth portion

831：Coil 9：Sensor 91：Secondary yoke

91a：Leading edge 91b：Trailing edge 911：Electrical Location point

92：Induction coil 92a：Induction coil 92b：Induction coil

93：Sensing component 94：Hall subassembly 96：Sensing magnetic circuit

96a：Main magnetic circuit 97：Air gap 98：Air gap

A：Axial gap B：Axial gap C：Axial gap

ψD：Diameter of axle G：Axial extension H：Axis hole depth

L：Axle grips length P：Side force PL：The lateral arm of force

Transition matrix W：Rotor gravity WL：Rotor gravity arm

X：Eccentric centrifugal power XL：The eccentric centrifugal arm of force

θ：The space angle α of alpha-turn coil and β coils₁₁、α₁₂、α₂₁、α₂₂：Induction coil

β₁₁、β₁₂、β₂₁、β₂₂：Induction coil

e_α11、e_α12、e_α21、e_α22：Induced voltage

e_β11、e_β12、e_β21、e_β22：Induced voltage

α₁、α₂、β₁、β₂：Induction coil

e_α1、e_α2、e_β1、e_β2：Induced voltage

e_αT、e_βT：Average induced voltage

λ′_mT：Equivalent magnetic flux θ_r-f：Electrical angle

ω_r：Magnetic field angular velocity θ_m：Pumping angular velocity

e_αβ11、e_αβ12、e_αβ21、e_αβ22：Induced voltage matrix

e_qd11、e_qd12、e_qd21、e_qd22：Induced voltage matrix

e_a12、e_a21、e_r11、e_r22：Induced voltage matrix

ε_a、ε_r、ε_all、ε_a21、ε_r11、ε_r21、ε_m11、ε_m12：Signal difference

Specific embodiment

First embodiment：There are the permanent magnetism canning pump of sensor bilateral support fixed axle structure, Fig. 1 (A), Fig. 1 (D)；

Refer to shown in Fig. 1 (A), the permanent magnetism canning pump 1 of the present embodiment is the fixing axle knot for having sensor bilateral support Structure, major part includes：Pump protecgulum 4, spider 31, impeller 5, bonnet 41, sensor 9, fixing axle 3 and canned motor 8, its In：

Pump protecgulum 4 is provided with an entrance 44, the flow channel space 47 of outlet 45 and, and for accommodating impeller 5, the inner side of pump protecgulum 4 exists An entrance thrust ring 46 is provided with entrance 44, for coupling with the impeller thrust bearing 53 of the entrance side of impeller 5 axial direction is collectively formed Thrust bearing；

Spider 31 is to be fixed on the porch of pump protecgulum 4, can be axially across impeller hub bore 54, for supporting fixing axle 3 One end；

Impeller 5 is installed in inside pump protecgulum 4, and spider 31 can be axially across impeller hub bore 54, for supporting fixation One end of axle 3, impeller boss 52 is used for being combined with the axially-extending portion 76 of motor rotor 7, makes impeller 5 constitute one with motor rotor 7 Body or the two mutually be embedded in be combined into one；

Bonnet 41 is a cup-shaped shell structure, and there is the boss 413 of tool ring channel structures bottom and without any through hole, it is ensured that What leakage bonnet 41 does not have produces, and the flange portion 411 of its front end combines the center flange 811 of pump protecgulum 4 and canned motor 8, For preventing the leakage of corrosive liquid；The cylindrical portion of the side of bonnet 41 is matched somebody with somebody therebetween through the internal diameter of stator 83 for slip pine Close, and the bottom of bonnet 41 is brought into close contact with motor after-frame 82, when conveying fluid pressure is born in the internal capacity room space 415 of bonnet 41 When, repeatedly product can provide enough support strengths to the stalloy of stator 83 with motor after-frame 82；Boss 413 is located at bonnet 41 Bottom centre and axially inner side extends in the inner diameter volume of main yoke 72, be inner side protrusion and with central shaft hole 413a (such as Fig. 3 (A)), its outside is the structure of cannelure 413b (such as Fig. 3 (A)), and the outer rim of its axis hole 413a is equiped with thrust ring 414 (such as Fig. 3 (A)), axial thrust bearing is coupled into for the bearing 79 with rotor 7, and the inside of cannelure 413b installing sensing component 93 contains Secondary yoke 91 (such as Fig. 3 (A)) and plural induction coil 92 (such as Fig. 3 (A)), the outside wall surface of axis hole 413a is completely by motor after-frame 82 axle support base 821b is combined closely with secondary yoke 91, and the protrusion backward of the bottom of axis hole 413a and motor after-frame 82 The internal diameter in portion 823 is completely closely sealed, and the depth H (such as Fig. 3 (A)) of the fully mated axis hole 413a of length of protuberance 823, can give The support of the high rigidity of fixing axle 3, that is, bonnet 41 provides only in itself corrosion protection isolation features and directly provides the rigidity of fixing axle 3 Support；

Sensor 9 is to be used for supervising in the cannelure 413b (such as Fig. 3 (A)) of axially extending bonnet boss 413 Survey bearing 79 to wear and tear, its structure is made up of secondary group of magnets 73 with sensing component 93, the quantity of secondary group of magnets 73 and master Group of magnets 71 is identical, and secondary group of magnets 73 is the one end for being installed on the internal diameter of main yoke 72 of motor rotor 7 near the bottom of bonnet 41 And back to main magnet group 71, the axial length of secondary Magnet 73 is at least the axial displacement length of rotor 7 (axially wearing away containing bearing) More than two times, sensing component 93 is to be made up of with plural induction coil 92 (such as Fig. 3 (A)) secondary yoke 91 (such as Fig. 3 (A)), On the basis of secondary yoke 91 is to be directed at the center of secondary Magnet 73, the axial length of secondary yoke 91 is divided into before and after two-stage nitration, two The edge axially back and forth of secondary Magnet 73 is axially moved all without two segment limits before and after secondary yoke 91.

Fixing axle 3 is bilateral support structure, is made up of the corrosion-resistant ceramic material with abrasion performance, and its front end is by spider 31 Support and support fixation, the mid portion of fixing axle 3 to couple for supporting with bearing 79 by axially extended boss 413 with rear end The rotation of motor rotor 7 and intermediate portion part length are meeting the length of bearing 79, and the axially free shifting of reserved motor rotor 7 Dynamic space, the cannelure 413b of boss 413 is completely by the axle support base 821b and both secondary yokes 91 phase of motor after-frame 82 Mutually combine closely and support and provide axle and grip length L, and can overcome plastics material intensity because temperature is raised the problem that reduces.

Canned motor 8 is made up of stator 83, motor center 81, motor after-frame 82 and motor rotor 7.

Stator 83 fastening be installed in motor center 81, be wound with thereon coil input PWM power supplys can produce magnetic flux for With the magnetic field reciprocal action of motor rotor 7, make motor rotor 7 produce moment of torsion and rotarily drive the output stream work(of impeller 5, the line of stator 83 Circle is protected against corrosive liquid and is corroded by pumping bonnet 41.

Flange 811 of the motor center 81 in pumping side is used for the tight flange portion 411 of lock bonnet 41 and pump protecgulum 4, to prevent corruption The leakage of erosion liquid, the rear flange of motor center 81 is used for tight lock motor after-frame 82 to provide complete structure support force, makes motor Axle support base 821b on after-frame 82 can provide the support force needed for fixing axle 3；

Motor after-frame 82 is tightly locked in the rear flange of the pumping side of center 81, the axle support base 821b on motor after-frame 82 is carried For the support force needed for fixing axle 3, the power line of the coil of motor stator 83 is connected to driving power supply by power cable outlet 822；

Motor rotor 7 is the ring being made up of with axially-extending portion 76 main magnet group 71, main yoke 72, secondary group of magnets 73 Type structure, the quantity of secondary group of magnets 73 is identical with main magnet group 71, and secondary group of magnets 73 is the main yoke for being installed on motor rotor 7 The internal diameter of ferrum 72 near the bottom of bonnet 41 one end and back to main magnet group 71, the interstitial hole of motor rotor 7 is equiped with bearing 79, leaf Wheel hub 52 is used for being combined with the axially-extending portion 76 of motor rotor 7, makes that impeller 5 is integrally formed with motor rotor 7 or the two is mutual It is embedded to be combined into one；

When pumping operates, fluid flow direction 6 to be flowed through and become the fluid with pressure after the runner of impeller 5, such as flowing side To 61, and exported by outlet 45, while there is segment fluid flow, such as flow direction 62 enters the appearance of bonnet 41 via the dorsal part of impeller 5 Room space 415, and via the outside of motor rotor 7 and the internal diameter of bonnet 41 gap to the flows of bonnet 41, then via fixing axle 3 Clearance flow is moved between bearing 79, finally flows through impeller hub bore 54, such as flow direction 65, return to the entrance of impeller 5, and this fluid is followed The heat of rotor generation is employed needed for provide ceramic bearing lubrication and taken away to circulation；

Refer to shown in Fig. 1 (D), the permanent magnetism canning pump of the present embodiment is the fixing axle knot of the bilateral support for having sensor Structure, major part includes：Pump protecgulum 4, spider 31, impeller 5, bonnet 41, sensor 9, fixing axle 3 and canned motor 8, when It is when pump operation condition has special demands, such as high-lift, the lengthening that the length of bearing 79 can be appropriate, therefore, in pumping configuration The length that the length of main yoke 72 carrys out fitted bearing 79 can suitably be increased in design, and the installation site of secondary group of magnets 73 is also position In the internal diameter of main yoke 72.

Second embodiment：There are the permanent magnetism canning pump of the monolateral supporting cantilever Relationship for Compound-Axis Structure of sensor, Fig. 1 (C)；

Refer to shown in Fig. 1 (C), the permanent magnetism canning pump of the present embodiment is combined for the cantilever of the monolateral support for having sensor Axle construction, pumping is made up of pump protecgulum 4a, impeller 5a, bonnet 41a, sensor 9, fixing axle 3a and canned motor 8；

Pump protecgulum 4a is provided with entrance 44, outlet 45 and flow channel space 47, and for accommodating impeller 5a, pump protecgulum 4a systems are metal Casting pot body, batch being covered with coffin 4b in anticorrosive plastic in it, and its inner side is provided with a thrust ring 46 at entrance 44, for impeller 5a The coupling of thrust bearing 53 of entrance side collectively forms axial thrust bearing；

Impeller 5a is installed in inside pump protecgulum 4a, and impeller boss 52 is used for being combined with the axially-extending portion 76 of motor rotor 7, Impeller 5a is integrally formed with motor rotor 7 or the two is mutually embedded in and is combined into one, the impeller boss plate 55 of impeller hub bore 54a systems one The perforate in central authorities is used for allowing circulating liquid to flow back, and as shown in flow direction 65, pump protecgulum entrance 44 becomes with the entrance of impeller 5a The runner of one smooth flaring is without other barriers, and the shape of impeller boss plate 55 is also smooth surface, can effectively reduce liquid Rate of flow of fluid has good anti-cavitation (NPSHr) performance guaranteeing pumping；

Bonnet 41a is a cup-shaped shell structure, and the structure of boss 418 of a perforate, the flange portion 411 of its front end are arranged at bottom With reference to pump protecgulum 4a and the center flange 811 of motor 8, for preventing the leakage of corrosive liquid；The cylindrical portion of bonnet 41a sides is worn Cross the internal diameter of stator 83, be therebetween slip loose fit, and bonnet 41a bottoms are brought into close contact with motor after-frame 82, when after When conveying fluid pressure is born in lid 41a internal capacity room space 415, repeatedly product can be carried the stalloy of stator 83 with motor after-frame 82 For enough support strengths；Boss 418 is located at bonnet 41a bottom centre and axially inner side extends in the internal diameter of main yoke 72 sky Between, it is that inner side is protruded and with centre bore 418a, its outside is relative to become inward recess 418b, the ring surface installing of inward recess 418b There is sensing component 93, sensing component 93 is containing secondary yoke 91 and plural induction coil 92, secondary yoke 91 and axle support base 821d Tight knot is closed, and the through hole at the center of boss 418 is used for installing fixing axle 3a, the sealing surface 418d of boss 418 by with it is O-shaped it The end face of axle sleeve 33 compels tightening seal with the axle support base 821d of motor after-frame 82, to guarantee that bonnet 41a does not have that what leakage is produced.

Sensor 9 is arranged on the annular of the outside inward recess 418b (such as Fig. 3 (B)) of axially extending bonnet boss 418 It is used for monitoring bearing wear in face, its structure is made up of secondary group of magnets 73 with sensing component 93, secondary group of magnets 73 Quantity is identical with main magnet group 71, and secondary group of magnets 73 is the internal diameter of main yoke 72 for being installed on rotor near bonnet 41a bottoms One end and back to main magnet group 71, the axial length of secondary Magnet 73 is at least the axial displacement length of rotor 7 and (axially grinds containing bearing Consumption) more than two times, sensing component 93 is by secondary yoke 91 (such as Fig. 3 (B)) and plural induction coil 92 (such as Fig. 3 (B)) group Into on the basis of secondary yoke 91 is to be directed at the axial centre of secondary Magnet 73, before and after the axial length of secondary yoke 91 is divided into Two-stage nitration, the edge axially back and forth of secondary Magnet 73 is axially moved all without two segment limits before and after secondary yoke 91.

Fixing axle 3a is cantilever design by corrosion-resistant Ceramic shaft sleeve 33 with abrasion performance, metal shaft 32 and the structure of motor after-frame 82 Into, and collectively form complete axle sealing system with bonnet 41a；One end of fixing axle 3a is installed in the axle of motor after-frame 82 and supports Required support strength can be obtained during seat 821d, wherein metal shaft 32 passes through the centre bore 332 of Ceramic shaft sleeve 33 (such as Fig. 5 (B) front end face 333 (such as Fig. 5 (B)) for), and with the one end with rounded nose 321 (such as Fig. 5 (B)) being pressed on Ceramic shaft sleeve, The spiro tooth part 323 of metal shaft 32 passes through the axially extending axis hole seat 418 of bonnet 41a and the center through hole of axle support base 821d, and Tightly it is locked on motor after-frame 82a with nut so that the end face of the thrust ring portion 331 (such as Fig. 5 (B)) of Ceramic shaft sleeve 33 can be pressed In the end face of axle support base 821d；(do not indicated) with plastic, rubber-coating 322 if the rounded nose 321 (such as Fig. 5 (B)) of metal shaft 32, Thereon and o-ring is provided with to reach the anti-corrosion function of sealing；The thrust ring portion 331 of Ceramic shaft sleeve 33 is used for mutual with rotor bearing 79 Coupling constitutes liquid hydrodynamic thrust bearing, and the end face of thrust ring portion 331 tightly locks compression with the end face of the axle support base 821d of after-frame 82, The sealing surface 418d of the two middle and packing boss 418, and by the end face seal of thrust ring portion 331 with o-ring, to guarantee What leakage bonnet 41a does not have produces, and constitutes combined type fixing axle 3a of a high rigidity；

Canned motor 8 is made up of stator 83, motor center 81, motor after-frame 82 and motor rotor 7；

Stator 83 fastening be installed in motor center 81, be wound with thereon coil input PWM power supplys can produce magnetic flux for With the magnetic field reciprocal action of motor rotor 7, make motor rotor 7 produce moment of torsion and rotarily drive impeller 5a output stream work(, stator 83 Coil 831 is protected against corrosive liquid and is corroded by pumping bonnet 41a；

Flange 811 of the motor center 81 in pumping side is used for tight lock bonnet 41a flange portions 411 and pump protecgulum 4a, to prevent The leakage of corrosive liquid, the rear flange 811 of motor center 81 is used for tight lock motor after-frame 82 to provide complete structure support force, makes Axle support base 821d on motor after-frame 82 can provide the support force needed for compound fixing axle 3a；

Motor after-frame 82 is tightly locked in the rear flange of the pumping side of center 81, the axle support base 821d on motor after-frame 82 is carried For the support force needed for fixing axle 3a, the power line of the coil 831 of motor stator 83 is connected to driving electricity by power cable outlet 822 Source；

Motor rotor 7 is the ring being made up of with axially-extending portion 76 main magnet group 71, main yoke 72, secondary group of magnets 73 Type structure, the quantity of secondary group of magnets 73 is identical with main magnet group 71, and secondary group of magnets 73 is the main yoke for being installed on motor rotor 7 The internal diameter of ferrum 72 near bonnet 41a bottoms one end and back to main magnet group 71, and be overmolding to 1 by corrosion resistant engineering plastics The annular rotor encapsulated 74 of leakage seam, the interstitial hole of motor rotor 7 is equiped with bearing 79, and impeller boss 52 is used for and motor rotor 7 Axially-extending portion 76 combine, impeller 5a is integrally formed with motor rotor 7 or the two mutually be embedded in be combined into one；

When pumping operates, fluid flow direction 6 to be flowed through and become the fluid with pressure after the runner of impeller 5a, is such as flowed Direction 61, and being exported by pump discharge 45, while there is segment fluid flow, such as flow direction 62 enters bonnet via the dorsal part of impeller 5a The room space 415 of 41a, and via the outside of motor rotor 7 and bonnet 41a internal diameters gap to bonnet 41a flows, then Jing Moved by clearance flow between fixing axle 3a and bearing 79, finally flow through the impeller hub bore 54a in the central authorities of impeller boss plate 55, such as flow direction 65, return to impeller 5a entrances, circulating for this fluid lubricates required and takes away motor rotor 7 for providing ceramic bearing 79 The heat of generation；

Refer to shown in Fig. 2, this legend is only carried out thin with the motor rotor 7 of 3rd embodiment and the integrative-structure of impeller 5 Portion illustrates that the extended structure of this legend will also apply to this creation other embodiments, and the hollow bulb of motor rotor 7 is provided with bearing 79, Rotation for being coupled into liquid hydrodynamic bearing system with fixing axle 3 to support motor rotor 7 is transmitted with power, axially-extending portion 76 For integral in combination with impeller boss 52, effectively to transmit the power of motor rotor 7, secondary group of magnets 73 is installed on motor The inner side of main yoke 72 of rotor 7 near the bottom of bonnet 41 one end and back to main magnet group 71, the secondary group of magnets 73 and motor Rotor 7 encapsulates avoid medicinal liquid from corroding together, and the quantity of secondary group of magnets 73 is equal with main magnet group 71 but volume is less than 1/10th.

Refer to shown in Fig. 3 (A), by taking the bonnet 41 of 3rd embodiment as an example, to its cannelure 413b structures and sensing group The installation of part 93 is described in detail, and bonnet 41 is a cup-shaped shell structure, and guarantees not have that what leakage is produced without any through hole Raw, the flange portion 411 of its front end combines the center flange 811 of pump protecgulum 4 and canned motor 8, for preventing letting out for corrosive liquid Leakage；Boss 413 is located at bonnet bottom centre and axially inner side extends in the inner diameter volume of main yoke 72, axial extension G systems Counted from the bottom of bonnet 41 toward the side of flange portion 411, be inner side protrusion and with central shaft hole 413a, and the depth H of axis hole 413a Then counted to axis hole 413a bottoms by the opening of boss 413, be the structure of cannelure 413b, the outer rim of its axis hole 413a on the outside of it Thrust ring 414 can be installed, the cannelure 413b in the outside of boss 413 can install sensing component 93, containing secondary yoke 91 with it is multiple Number induction coil 92, the outside wall surface of axis hole 413a is completely by the axle support base 821a (such as Fig. 4 (A)) and secondary yoke of motor after-frame 82 Ferrum 91 is combined closely, and the bottom of axis hole 413a is completely closely sealed and convex with the internal diameter of the protuberance backward 823 of motor after-frame 82 Going out the depth H of the fully mated axis hole 413a of length in portion 823 can give the support of the high rigidity of fixing axle 3, that is, bonnet 41 Body provides only corrosion protection isolation features and does not directly provide the rigid support of fixing axle 3；

Refer to shown in Fig. 3 (B), by taking the bonnet 41 of fourth embodiment as an example, to its inward recess 418b structures and sensing group The installation of part 93 is described in detail, and bonnet 41a is a cup-shaped shell structure, and there is a perforate in its bottom centre for installing fixation Axle 3a (such as Fig. 1 (B)), the flange portion 411 of its front end combines the center flange of pump protecgulum 4a and canned motor 8 (such as Fig. 1 (B)) 811 (such as Fig. 1 (B)), for preventing the leakage of corrosive liquid；Boss 418 is located at bonnet bottom centre and axially inner side extends It is inner side protrusion and the protrusion pore structure with centre bore 418a in main yoke 72 (such as Fig. 1 (B)) inner diameter volume, its axial direction is prolonged Elongation G is counted to sealing surface 418d from the bottom of bonnet 41 toward the side of flange portion 411, and it is inward recess 418b that its outside is relative, interior The internal spherical surface installing sensing component 93 of shrinkage pool 418b, sensing component 93 is secondary containing secondary yoke 91 and plural induction coil 92 Yoke 91 is closed with axle support base 821d tight knots, and the through hole at the center of boss 418 is used for installing fixing axle 3a (such as Fig. 1 (B)), axle The sealing surface 418d of hole seat 418 is by (such as Fig. 1 (the B)) end face of axle sleeve 33 with o-ring and the axle support base of motor after-frame 82 821d compels tightening seal, to guarantee that bonnet 41a does not have that what leakage is produced, and after the rigid support of fixing axle 3a is entirely from motor The center hole length L of frame 82 and its axle support base 821d；

Refer to shown in Fig. 4 (A), by taking the bilateral support fixing axle 3 of 3rd embodiment as an example, do to axially gripping length L Describe in detail, boss 413 is located at the bottom centre of bonnet 41 and axially inner side extends in main yoke 72 (such as Fig. 1 (B)) internal diameter sky Between, it is that inner side is protruded and with central shaft hole 413a (such as Fig. 3 (A)), its outside is the structure of cannelure 413b (such as Fig. 3 (A)), And the inside installing sensing component 93 of cannelure 413b is containing secondary yoke 91 and plural induction coil 92, the axle of motor after-frame 82 Support seat 821a combines closely with secondary yoke 91 and gives the outside wall surface maximum support intensity of axis hole 413a completely, and motor after-frame 82 support strength can give the support of the high rigidity of fixing axle 3 from motor center 81；

Axle is gripped length L system and is determined with the axial extension G of boss 413 and axis hole depth H, can actually provide axle firm Property support, axle grips the longer problem that plastics material intensity can be overcome to reduce because temperature is raised that heals of length L；

Refer to shown in Fig. 4 (B), length L is gripped with the axial direction of cantilever fixing axle 3a (such as Fig. 1 (B)) of fourth embodiment Elaborate, bonnet 41a is a cup-shaped shell structure, and its bottom centre has a boss 418 and axially inner side extends in master The inner diameter volume of yoke 72, is inner side protrusion and the protrusion pore structure with centre bore 418a, on the outside of it for installing fixing axle 3a Relative is inward recess 418b, and the internal spherical surface of inward recess 418b installs sensing component 93, the axle support base 821d of motor after-frame 82 Compression is tightly locked with the end face of thrust ring portion 331 (such as Fig. 5 (B)), and the sealing surface 418d of packing boss 418 guarantees that sealing zero is let out Leakage；

Axle is gripped length L system and is determined with the axial extension G of boss 418 and axis hole depth L, can actually provide axle firm Property support, axle grip length L more length more can bear multi-load power and its moment of torsion, the Relationship for Compound-Axis Structure of this creation can be avoided completely The problem that the plastics material intensity of bonnet 41a is reduced because temperature is raised；

Refer to shown in Fig. 5 (A), with the motor rotor 7 of first embodiment or 3rd embodiment in bilateral support fixing axle 3 Multi-load stress and its moment of torsion elaborate, fixing axle 3 is made up of the corrosion-resistant ceramic material with abrasion performance, its front end Supported by the spider 31 of plastics material, rear end supports fixation by axially extended boss 413, and the intensity of boss 413 It is to be provided with secondary yoke 91 from the axle support base 821b for combining closely；The mid portion of fixing axle 3 couples use with bearing 79 Come support motor rotor 7 rotation and intermediate portion part length to meet the length of bearing 79, and the axial direction of reserved motor rotor 7 Space, such as A, B and the C in figure are moved freely, still there is axle between bearing 79 and thrust ring 414 when 7 real-world operation of motor rotor To gap A, there is axial gap C between rotor bearing 79 and spider 31, have axial gap B between rotor 7 and bonnet 41, this three Gap can produce change because of the end wear of entrance thrust ring 46, thrust bearing 53, the abrasion of thrust ring 414 and bearing 79, Most situation motor rotors 7 are to be moved along because of the axial thrust of impeller 5, make thrust ring 46 that slip fortune is coupled with bearing 53 Turn, so, the width of clearance C have to be larger than the tear-and-wear allowance amount of thrust ring 46 and bearing 53, and gap B can diminish because of clearance C And its width is increased, but under conditions of pumping operates at high flow capacity low lift, motor rotor 7 is may be because of the axle of fluid Move backward to momentum, make thrust ring 414 that slip operating is coupled with bearing 79, at this moment the width of gap A is decreased to zero, so The width of gap B have to be larger than the abrasion loss of gap A plus the end face of upper bearing (metal) 79 and thrust bearing 414, to avoid motor rotor 7 straight Connecing friction bonnet 41 causes breakage, that is, the axially free shift length of motor rotor 7 to be equal to gap A and add clearance C, due to modeling The bonnet 41 of material system is larger with the size distortion amount of protecgulum 4, and each reserved gap size must all include manufacturing tolerance；Above-mentioned Under operating condition, fixing axle 3 and its supporting construction must bear multi-load power, W containing gravity, centrifugal force X, side force P and respectively apply The moment of torsion of power, wherein gravity W are the power produced by rotor weight, and centrifugal force X is rotor centroid because causing bias in the gap of bearing 79 Centrifugal force, side force P causes the power for being applied to impeller 5 for the boiling fluid pressure of the flow channel space 47 of pump protecgulum 4, and gravity Square is exactly that gravity W is multiplied by arm of force WL, and centrifugal moment is exactly that centrifugal force X is multiplied by arm of force XL, and lateral torque is exactly that side force P is multiplied by power The conjunction of arm PL, these power and torque just becomes and is applied to making a concerted effort and moment of torsion for fixed shaft end, and the power of majority and torque will be by solid The supporting construction of the rear end of dead axle 3 is undertaken, because the tripod 31 of corrosion-resistant plastic can reduce its intensity because temperature is raised, axle It is the maximum fluctuating load source of the structural rigidity of fixing axle 3 to hold eccentric centrifugal power X caused by 79 abrasion, abrasion loss it is higher it is eccentric from Mental and physical efforts X are bigger, secondly cause side force P for being applied to impeller 5 for boiling fluid pressure, because by the external diameter of impeller 5 to fixation There is the most long arm of force PL rear end of axle 3, will also result in and produces crooked between the center of motor rotor 7 and the axle center of fixing axle 3, is directed at support The continuous deformation of structure, the length of arm of force PL due to axial extension G substantial reductions, and gripping length L increases fixing axle Ability to bears of the 3a to moment of torsion, can slow down and improve above-mentioned crooked and constructional variant problem, and be greatly reduced before fixing axle 3 The demand of the supporting construction intensity of spider 31 at end；

Refer to shown in Fig. 5 (B), to the motor rotor 7 of second embodiment side cantilever fixing axle 3a multi-load Stress and its moment of torsion elaborate, and fixing axle 3a is made up of metal shaft 32 with Ceramic shaft sleeve 33, one end installing of fixing axle 3a Required support strength can be obtained in the axle support base 821d of motor after-frame 82, wherein metal shaft 32 passes through Ceramic shaft sleeve 33 Centre bore 332, and the front end face 333 that Ceramic shaft sleeve is pressed on the one end with rounded nose 321, the thread of metal shaft 32 Portion 323 is tightly locked in motor after-frame 82 through the boss 418 of bonnet 41a and the center through hole of axle support base 821d with nut On so that the end face of the thrust ring portion 331 of Ceramic shaft sleeve 33 can be pressed on the end face of axle support base 821d, and constitute high rigidity Compound fixing axle 3a；The rotation for supporting motor rotor 7 is coupled with bearing 79 for fixing axle 3a and its length meets bearing 79 Length requirement, and reserved motor rotor 7 is free to move axially space, the A and B such as in figure, when 7 real-world operation of motor rotor Still there is axial gap A (coordinating Fig. 5 (A)) between bearing 79 and thrust ring 414, have between axial direction between motor rotor 7 and bonnet 41a Gap B, this two gap can produce because of the end wear of entrance thrust ring 46, thrust bearing 53, the abrasion of thrust ring 414 and bearing 79 Changing, most situation motor rotors 7 are to be moved along because of the axial thrust of impeller 5a, make thrust ring 46 and the coupling of bearing 53 Operating of sliding is closed, and therefore gap B can increase its width, but under conditions of pumping operates at high flow capacity low lift, horse It is backward to move because of the axial momentum of fluid up to rotor 7, makes thrust ring 414 that slip operating is coupled with bearing 79, gap A's Width is decreased to zero, so the width of gap B have to be larger than the abrasion loss of gap A plus the end face of upper bearing (metal) 79 and thrust bearing 414, To avoid the direct friction bonnet 41a of motor rotor 7 from causing breakage, that is, gap A to become with the axially free displacement of motor rotor 7 Change, because the size distortion amount of plastic bonnet 41a is larger, each reserved gap size must all include manufacturing tolerance；Gu Dead axle 3a and its supporting construction must bear multi-load power, wherein W containing gravity, centrifugal force X, side force P and its moment of torsion, gravity W Power produced by rotor weight, centrifugal force X is rotor centroid because the gap of bearing 79 causes a departure the eccentric centrifugal power in axle center, side Cause the power for being applied to impeller 5a for the boiling fluid pressure of the flow channel space 47 of pump protecgulum 4a to power P, and gravitational moment is exactly Gravity W is multiplied by arm of force WL, and centrifugal moment is exactly that centrifugal force X is multiplied by arm of force XL, and lateral torque is exactly that side force P is multiplied by arm of force PL, The conjunction of these power and torque just becomes and is applied to making a concerted effort and moment of torsion for fixed shaft end, and the power of whole and torque will be by fixing axles 3a The supporting construction of rear end is undertaken, and it is maximum fluctuating load source that bearing 79 wears away caused eccentric centrifugal power X, and abrasion loss heals High eccentric centrifugal power X is bigger, secondly causes side force P for being applied to impeller 5 for boiling fluid pressure, because outside by impeller 5 There is the most long arm of force PL footpath to fixing axle 3a rear end, will also result in produce between the center of motor rotor 7 and fixing axle 3a axle center it is askew Tiltedly, the continuous deformation of supporting construction is directed at, the length of arm of force PL due to axial extension G substantial reductions, and grip length L Increase ability to bear of fixing axle 3a to moment of torsion, can slow down and improve above-mentioned crooked and constructional variant problem；

3rd embodiment：The bearing wear monitoring device structure of permanent magnetism canning pump, Fig. 6 (A), Fig. 6 (B), Fig. 6 (C) and Fig. 6 (D)；

Shown in Fig. 6 (A), this figure illustrates the radial structure of bearing wear monitoring device, and this legend adopts the coil design of 8 pole 8 System is only used for one of illustrating example that other designs that may achieve identical effect are not limited with the present embodiment；The structure system of sensor 9 It is made up of with sensing component 93 secondary group of magnets 73, secondary group of magnets 73 is installed on the inner side of main yoke 72 of motor rotor 7 and leans on The nearly bottom end of bonnet 41 and back to main magnet group 71, the quantity of secondary group of magnets 73 is equal with main magnet group 71 but volume is less than ten / mono-, and its area can at least provide the magnetomotive force and magnetic flux density needed for induction coil with thickness；Herein according to secondary Magnet 45 degree of the Space Angle into eight electrical angle 180 degrees circumference down of quantity 8, its magnetic line of force of main magnetic circuit 96a is by main magnet 71a tables Teeth portion 83a for reaching stator 83 is projected through air gap 98 in face, and via stator yoke iron 83b adjacent fingers 83c and again is again passed by Return to and original adjacent main magnet 71b through air gap 98, and return to original main magnet 71a via main yoke 72 and constitute close Closed magnetic circuit 96a, sensing its magnetic line of force of magnetic circuit 96 is projected by secondary Magnet 73a surfaces and reaches secondary yoke 91 through air gap 97, then Air gap 97 is again passed through via secondary yoke to return to and original adjacent secondary Magnet 73b and secondary Magnet 73c, and via main yoke Ferrum 72 returns to original secondary Magnet and constitutes closed magnetic circuit 96 so that sensing magnetic circuit 96 is total to both main magnetic circuit 96a magnetic lines of force It is stored in main yoke, that is, the magnetic line of force of sensor is through main yoke but interference-free, sensing component mat when motor rotor 7 rotates Induced voltage signal is exported by cutting magnetic line, therefore voltage signal is not independently disturbed by external voltage；Sensing component 93 be by Secondary yoke 91 is constituted with plural induction coil 92, and plural induction coil 92 is to be installed in the surface of secondary yoke 91, is alignd secondary Magnet axial centre 73g has front induction coil 92a and rear induction coil 92b axial directions arranged adjacent, and in circumferencial direction sensing 92 points of coil is coil α and bis- groups of coil β, has four induction coils mutually to correspond in radial direction 180 degree per group, 8 lines of induction Circle is respectively α₁₁、α₁₂、α₂₁、α₂₂、β₁₁、β₁₂、β₂₁、β₂₂And it is equivalently-sized, and coil α differs 90 degree with coil β in electrical angle (270 degree), that is, 22.5 degree (67.5 degree) are differed in Space Angle Θ, induction coil 92a has coil α₁₁, coil α₂₁, coil β₁₁, coil β₂₁, induction coil 92b has coil α₁₂, coil α₂₂, coil β₁₂, coil β₂₂；The electric angle of above-mentioned induction coil 92 Position and position system by the electrical Location point 911 of the trailing edge 91b positioned at secondary yoke 91 to reach with space angle, electrical Location point 911 align induction coil α₁₁Center, 90 degree of electrical angle, 22.5 degree of Space Angle changed with the maintenance for facilitating sensing component 93；Sense The axial length for answering coil 92 (contains thrust bearing not less than secondary Magnet axial length plus the free axial displacement of motor rotor 7 Abrasion limit value), the circumferential width of induction coil 92 is not more than electrical angle 180 degree；The axial length of secondary yoke 91 is more than sensing Coil 92 arrange after axial overall length and its leading edge 91a and trailing edge 91b can be fully contemplated by its induction coil 92, to guarantee motor The magnetic line of force of the sensing magnetic circuit 96 of secondary Magnet still can keep stablizing unaffected and deforming or deviation during 7 axial displacement of rotor, May insure the voltage signal stability of induction coil 92 with it is linear；Can obtain when motor rotor 7 has radially, axially displacement Its faradism pressure reduction, the faradism pressure reduction of different induction coil combinations can represent axially or radially displacement, when displacement surpasses When crossing displacement gaps, representing bearing has abrasion that abrasion loss occurs and can calculate, and displacement must be sent out when exceeding abrasion warning value Go out warning notice, displacement must stop pumping operating when exceeding abrasion limits value；

Fig. 6 (B), Fig. 6 (C), Fig. 6 (D) are referred to shown in Fig. 6 (E), this figure is used for illustrating bearing wear monitoring device Induction coil actual arrangement mode and calculation of lightning induced voltage method, this legend is only used for one of illustrating using the coil design system of 8 pole 8 Example, other may achieve the design of identical effect or calculating method is not limited with the present embodiment, and detector adopts 8 induction coils 92 are respectively α₁₁、α₁₂、α₂₁、α₂₂、β₁₁、β₁₂、β₂₁、β₂₂, when motor rotor 7 rotates between secondary Magnet and induction coil 92 Form a rotating excitation field and export induced voltage, these induced voltage signals can use the method for d-q axles to calculate, and further Axial displacement and the radial displacement of motor rotor 7 are converted to, as bearing wear basis for estimation, are described as follows：

The signal of the detector of 8 groups of coils adopts the signal of meansigma methodss, its average value signal：

Because above-mentioned average value signal will not affected by bearing wear axially and radially, and e_αTAnd e_βTSignal phase 90 ° of position difference, it is assumed that e_αTAnd e_βTFunction be：

e_αTλ′_mTω_rcosθ_r-f (2)

e_βTλ′_mTω_rsinθ_r-f (3)

ω in formula_rFor rotating speed, λ_mTSecondary Magnet 73 and induction coil 92 for detector couples equivalent magnetic flux, θ_r-f For the electric Angle Position of detector signal.

ω_rAnd θ_r-fCan be learnt by (2) and (3)：

Wherein, λ '_mTCan be obtained by actual measurement, and pumping actual speed can be obtained with space angle by following formula：

N_pFor number of poles, this example N_p=8 (6a)

In order to carry out axial direction and the gauge wear of calculation bearing, each coil signal is converted into magnetic field d-q axial coordinates, such as Under：

e_αβ11[e_α11 e_β11]^T (7a)

e_αβ12[e_α12 e_β12]^T (7b)

e_αβ21[e_α21 e_β21]^T (7c)

e_αβ22[e_α22 e_β22]^T (7d)

Bearing axial displacement is defined with the basis for estimation of abrasion for following the two big person of difference：

ε_a11e_qd11-e_qd12 (10a)

ε_a21e_qd21-e_qd22 (10b)

Bearing radial displacement is defined with the basis for estimation of abrasion for following the two big person of difference：

ε_r11e_qd11-e_qd21 (11a)

ε_r21e_qd12-e_qd22 (11b)

Bearing is radially defined with the comprehensive descision of abrasion with axial displacement according to big person of difference both following：

ε_m11e_qd11-e_qd22 (12a)

ε_m12e_qd12-e_qd21 (12b)

The center displacement amount and Angle Position of rotor, that is, the reality of rotor axis can just be calculated according to above formula Movement locus.

Fourth embodiment：The bearing wear monitoring device structure of permanent magnetism canning pump, Fig. 6 (F)；

Refer to shown in Fig. 6 (F), the induction coil 92 of the bearing wear monitoring device of this figure explanation 3rd embodiment is reduced For 4, this legend one of is only used for illustrating example using the coil design system of 8 pole 4, and other may achieve the design or calculating of identical effect Method is not limited with the present embodiment；The area of secondary Magnet 73 can at least provide the magnetomotive force and magnetic needed for induction coil with thickness Flux density, sensing component 93 is to be made up of with plural induction coil 92 secondary yoke 91；Herein according to 73 quantity of secondary Magnet eight Eight equal portions of circumference down 45 degree of Space Angle into electrical angle 180 degree；92 points of induction coil is coil α and bis- groups of coil β, point Wei not α₁、α₂With β₁、β₂, wherein α differ with β coil electrics angle in 90 degree of (270 degree) Space Angles Θ differ 22.5 degree (67.5 Degree), two sub-induction coil radial direction 180 degrees of each group are corresponding, induction coil α₁、α₂、β₁、β₂For equivalently-sized coil, and axle It is (to wear away limit containing thrust bearing plus the free axial direction shift length of motor rotor 7 not less than the length of secondary Magnet to length Value), and the circumferential width of induction coil 92 is not more than electrical angle 180 degree；α₁With β₂Coil leading edge align before secondary yoke 91 Edge 91a, α₁With β₂Coil trailing edge align the trailing edge 73f, α of secondary Magnet 73₂With β₁Coil leading edge align secondary Magnet 73 Leading edge 73e, α₂With β₁Coil trailing edge near secondary yoke 91 trailing edge 91b, that is, α₁、α₂、β₁、β₂For the secondary Magnet that aligns The axially staggered arrangement of edge mode axially back and forth；The electric angle positioning of above-mentioned induction coil 92 is with space angle positioning system by electric Reaching, electrical Location point 911 is located at the trailing edge 91b of secondary yoke 91 and aligns induction coil α anchor point 911₁Center, electricity 90 degree of air horn, 22.5 degree of Space Angle, is changed with the maintenance for facilitating sensing component 93；The axial overall length of secondary yoke 91 is more than sense Answer the axial overall length after the arrangement of coil 92 and its leading edge 91a can be fully contemplated by its induction coil 92 with trailing edge 91b, to guarantee horse The magnetic line of force up to the sensing magnetic circuit 96 of secondary Magnet during 7 axial displacement of rotor can still keep stablizing unaffected and deform or partially Folding, maintenance be stably distributed in the surface of secondary yoke 91, it can be ensured that the voltage signal stability of induction coil 92 with it is linear；Meter Calculating the induced voltage difference of coil 92 can obtain rotor in axial direction and radial displacement, when displacement exceedes motor rotor 7 certainly During by mobile boundary value, represent thrust bearing has abrasion that abrasion loss occurs and can calculate with journal bearing, and displacement exceedes axle Warning notice is must send out when holding abrasion warning value, displacement must stop pumping operating when exceeding bearing wear limits value；

The signal of the detector of 4 coils its average value signal and is using the signal of meansigma methodss

Because above-mentioned average value signal will not affected by bearing friction axially and radially, and e_αTAnd e_βTSignal phase 90 ° of position difference, it is assumed that e_αTAnd e_βTFunction be：

e_αTλ′_mTω_rcosθ_r-f (14)

e_βTλ′_mTω_rsinθ_r-f (15)

ω in formula_rFor rotating speed, λ_mTMagnet and coil for detector couples equivalent magnetic flux, θ_r-fFor detector letter Number electric Angle Position.ω_rAnd θ_r-fCan be learnt by (2) and (3)：

Wherein, λ '_mTCan be obtained by actual measurement, and pumping actual speed can be obtained with space angle by following formula：

N_pFor number of poles, this example N_p=8 (18a)

In order to carry out axial direction and the gauge wear of calculation bearing, each coil signal is converted into magnetic field d-q axial coordinates, such as Under：

e_a12[e_α1 e_β2]^T (19a)

e_a21[e_α2 e_β1]^T (19b)

e_r11[e_α1 e_β1]^T (19c)

e_r22[e_α2 e_β2]^T (19d)

Bearing axial displacement is following difference with the basis for estimation of abrasion：

ε_ae_qd12-e_qd21 (25)

Bearing radial displacement is following difference with the basis for estimation of abrasion：

ε_re_qd11-e_qd22 (26)

Bearing is radially consideration ε simultaneously with axial displacement and the comprehensive descision of abrasion foundation_aWith ε_r, according to above formula just The center displacement amount and Angle Position θ of rotor can be calculated_m, that is, the actual motion track of rotor axis.

5th embodiment：Permanent magnetism canning pump sensor is equiped with Hall subassembly, Fig. 7；

Refer to shown in Fig. 7, illustrate that Hall subassembly 94 is installed in the position description of sensing component, this legend adopts 8 pole 3 The compound sensing device further system of Hall component 94 and 4 induction coils 92 one of is only used for illustrating example, and other may achieve identical effect Design be not limited with the present embodiment, 92 points of induction coil is coil α and bis- groups of coil β, respectively α₁、α₂With β₁、β₂, its Middle α differs 22.5 degree (67.5 degree) of difference, two sub- lines of induction of each group in 90 degree of (270 degree) Space Angles Θ with β coil electrics angle Circle radial direction 180 degree is corresponding, induction coil α₁、α₂、β₁、β₂For equivalently-sized coil, and axial length is not less than secondary magnetic The length of ferrum (contains thrust bearing and wears away limit value) plus the free axial direction shift length of motor rotor 7, and the circumference of induction coil 92 Width is not more than electrical angle 180 degree；α₁With β₂Coil leading edge align leading edge 91a of secondary yoke 91, α₁With β₂Coil trailing edge Align the trailing edge 73f, α of secondary Magnet 73₂With β₁Coil leading edge align leading edge 73e of secondary Magnet 73, α₂With β₁Coil after Trailing edge 91b, that is, α of the edge near secondary yoke 91₁、α₂、β₁、β₂For the secondary Magnet that aligns, axially back and forth edge mode is axially handed over Staggered arrangement is arranged；The electric angle positioning of above-mentioned induction coil 92 is reached with space angle positioning system by electrical Location point 911, electrically Anchor point 911 is located at the trailing edge 91b of secondary yoke 91 and aligns induction coil α₁Center, 90 degree of Space Angles 22.5 of electrical angle Degree, is changed with the maintenance for facilitating sensing component 93；3 electrical angles of Hall subassembly 94 differ 120 degree of Space Angles and differ 30 degree, wherein Between the Hall subassembly 94 of position be placed exactly in induction coil α₂Inside center, 90 degree of electrical angle, 202.5 degree of Space Angle, remaining 2 Individual Hall subassembly 94 is then located at induction coil α₂Both sides external interval 120 degree of electrical angle；The axial overall length of secondary yoke 91 More than induction coil 92 arrange after axial overall length and its outer rim of induction coil 92 can be fully contemplated by, to guarantee motor rotor 7 The magnetic line of force of the sensing magnetic circuit 96 of secondary Magnet still can keep stablizing unaffected and deforming or deviation during axial displacement, remain steady Surely be distributed in the surface of secondary yoke 91, it can be ensured that the voltage signal stability of induction coil 92 with it is linear；Calculate coil 92 Induced voltage difference can obtain rotor in axial direction and radial displacement, when displacement moves freely boundary more than motor rotor 7 During limit value, represent thrust bearing has abrasion that abrasion loss occurs and can calculate with journal bearing, and displacement is warned more than bearing wear Warning notice is must send out during announcement value, displacement must stop pumping operating when exceeding bearing wear limits value, bearing wear is calculated Method is as shown in sixth embodiment；When motor rotor 7 operates and when having axial displacement to occur, the magnetic line of force of magnetic circuit 96 is sensed Can still keep stablizing unaffected and deforming or deviation, it can be ensured that the voltage signal stability of Hall subassembly 94, and can provide The voltage signal of reversal of magnetism is used for calculating magnetic pole angle, and to be provided with the driver of sensor permanent magnetism canning pump is driven.

Claims (7)

1. a kind of permanent magnetism canning pump configuration improved device, purpose is in the structural rigidity for promoting fixing axle and can install sensor, its Middle sensor system includes secondary group of magnets and sensing component, it is characterised in that：

The quantity of secondary group of magnets is identical with main magnet group；The main yoke internal diameter that secondary Magnet system is installed on motor rotor is close One end of bonnet bottom, and installing back to main magnet, secondary group of magnets pole orientation and main magnet group conversely, with motor rotor one Play encapsulation to avoid medicinal liquid from corroding；The axial length of secondary Magnet is at least motor rotor axial displacement length and axially grinds containing bearing Two times of consumption；Its magnetic line of force is projected through air gap by secondary magnet surface and reaches secondary yoke, then via secondary yoke return to The original secondary Magnet of other adjacent, and return to original secondary Magnet via main yoke and constitute closed sensing magnetic circuit；So that Sensing magnetic circuit coexists in main yoke, that is, the magnetic line of force of sensor through main yoke with both main magnetic circuits magnetic line of force of main magnet But it is interference-free；

Sensing component system includes secondary yoke and plural inductive component, sensing component system sensing component be installed in magnetic conductivity it Simultaneously Jing insulant is packaged into a component on ring-like secondary yoke surface, and is installed in defeated to completely cut off within the boss of bonnet bottom Liquor charging body；Secondary yoke inner side is fixed on axle support base outside；And the trailing edge of secondary yoke is provided with an electrical angle anchor point, should Anchor point system links the axle center anchor point of the axle support base of motor after-frame, and links the electrical angle of motor stator coils winding Anchor point；The edge axially back and forth of secondary Magnet is axially moved all without the axial range beyond secondary yoke；Each sensing Component cutting magnetic line output induced voltage signal under motor rotor rotation.

2. permanent magnetism canning pump configuration improved device according to claim 1, it is characterised in that：Wherein, the number of induction coil Amount is at least the even number of 4, and the axial length of induction coil adds upper rotor part free axle to position not less than secondary Magnet axial length Move and wear away limit value containing thrust bearing, the circumferential width of induction coil is not more than electrical angle 180 degree.

3. permanent magnetism canning pump configuration improved device according to claim 1, it is characterised in that：Wherein, the sense of sensing component Component is answered to be induction coil, sensing component is made up of secondary yoke with plural induction coil, plural inductive coil series installing row Annular secondary yoke surface is listed in, and induction coil is divided into coil α and bis- groups of coil β in circumferencial direction, and in electrical angle phase Differ from 90 degree or 270 degree；Electric angle positioning and the space angle of induction coil positions system by the electrical Location positioned at secondary yoke Put to reach, changed with the maintenance for facilitating sensing component.

4. permanent magnetism canning pump configuration improved device according to claim 3, it is characterised in that：Wherein, each induction coil At least cover the axial length of the secondary Magnet of half during arrangement, the axial alignment of induction coil includes before and after adjacent row Arrange, be staggered front to back arrangement and space angle 180 degree arranged opposite, or the combination of above-mentioned arrangement mode.

5. permanent magnetism canning pump configuration improved device according to claim 3, it is characterised in that：Wherein, the axle of secondary yoke To length is more than the axial overall length after induction coil arrangement and its leading edge can be fully contemplated by its induction coil, and motor with trailing edge Axial length of the secondary Magnet axial displacement range of rotor without departing from secondary yoke.

6. permanent magnetism canning pump configuration improved device according to claim 1, it is characterised in that：Wherein, the sense of sensing component Component is answered for plural induction coil and plural Hall component, plural inductive coil series are installed in annular secondary yoke surface, and Circumferencial direction is divided into coil α and bis- groups of coil β induction coil, and differs 90 degree or 270 degree in electrical angle；The electricity of induction coil Air horn degree positions and positions by the electrical Location point positioned at secondary yoke to reach with space angle, to facilitate the maintenance of sensing component Change, 3 Hall subassembly electrical angles differ 120 degree, and the Hall subassembly of intermediate position is placed exactly in one of induction coil Inside electrical angle center, and be aligned with secondary Magnet axial centre, remaining 2 Hall subassembly is then positioned at the induction coil Both sides external is spaced 120 degree of electrical angle.

7. the permanent magnetism canning pump configuration improved device according to Claims 2 or 3 or 4, it is characterised in that：Wherein, sensing group The inductive component of part is plural induction coil, and the axial direction and radial displacement and angle of motor rotor can be gone out via calculation of lightning induced voltage Degree.