CN202128743U - Magnetically-suspended artificial heart pump - Google Patents
Magnetically-suspended artificial heart pump Download PDFInfo
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- CN202128743U CN202128743U CN201120158488U CN201120158488U CN202128743U CN 202128743 U CN202128743 U CN 202128743U CN 201120158488 U CN201120158488 U CN 201120158488U CN 201120158488 U CN201120158488 U CN 201120158488U CN 202128743 U CN202128743 U CN 202128743U
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- axial displacement
- heart pump
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Abstract
The utility model discloses a magnetically-suspended artificial heart pump. The adopted technical scheme is that the magnetically-suspended artificial heart pump comprises a stator and a rotor, and is characterized in that at least one axial single electromagnetic bearing is arranged in the axial direction of the rotor, at least two radial permanent magnetic bearings are arranged in the radial direction of the rotor, and at least one axial displacement detection unit is disposed in the radial direction of the rotor and is connected in an axial displacement control system. The magnetically-suspended artificial heart pump of the utility model has the beneficial effects that the change of the magnetic induction intensity B of a rotor magnetic ring of the axial permanent magnetic bearings is measured by a radially-arranged Hall sensor to reflect the axial displacement of the rotor, and is used for the axial control of the rotor, thereby realizing axial active suspension and radial passive suspension, so that the spatial five-dof suspension is accomplished.
Description
Technical field
This utility model relates to a kind of artificial heart pump, especially relates to a kind of axial-flow type magnetic suspension manual heart pump of rotor axial displacement radial measurement.
Background technology
The magnetic suspension system of magnetic suspension manual heart pump can be divided into electromagnetic suspension system, permanent magnet suspension system and hybrid suspension system.Permanent-magnet bearing is a passive stabilization, does not need the sensor rotor displacement; Electromagnetic bearing and combined bearing (electromagnetism, permanent magnetism combined bearing) are active stability; Need utilize pick off to come the detection rotor displacement through contactless mode; Then displacement signal is sent into controller, the electric current in the control solenoid, thus reach the purpose of controlling the rotor levitation position.Therefore, displacement transducer is one of important component part of magnetic suspension manual heart pump, and its performance also can influence the performance of whole system.
In magnetic suspension system; Rotor is contactless to be suspended in the space; Rotor displacement can only detect through contactless mode, and the pick off that can accomplish this detection mode has eddy current sensor, ultrasonic sensor, capacitance type sensor, Hall element and optical pickocff etc.Because particular job environment and the requirement of magnetic suspension manual heart pump; The displacement transducer that adopts at present has current vortex sensor, ultrasonic sensor and Hall element etc.; And be current vortex sensor in heart pump, using more relatively, this pick off has characteristics such as dynamic property is good, the output linearity is good, volume is less.But current vortex sensor has certain selectivity to the material of measured surface, and material is different, and its performance is also different; When measuring the axial displacement of rotor, must be installed in axle head, because its length is longer, heart pump length has extended; And sensor probe can not directly contact with blood, must be at sensor probe surface coverage one deck titanium alloy thin slice, and this also can influence sensor performance; Current vortex sensor needs independent the installation, is unfavorable for the integrated design of magnetic bearing axial system.
Ultrasonic sensor is a device of realizing the acoustic-electric conversion, and through transmitting and receiving ultrasound wave, the signal of telecommunication that hyperacoustic power conversion becomes to be easy to detect, it is simple to use principle, makes things convenient for, and cost is also very low.But ultrasonic sensor also exists some reflections, noise problem at present; And when ultrasonic sensor is measured the axial displacement of rotor, also need be installed in the rotor axle head, the heart pump axial length has extended.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming of prior art; Provide a kind of axial dimension little, simple in structure, detect reliable magnetic suspension manual heart pump; The technical scheme that adopts is: a kind of magnetic suspension manual heart pump; Comprise stator and rotor, it is characterized in that: on rotor axial, be provided with at least one axial single electromagnetic bearing, upwards be provided with at least two radial permanent magnet bearings in the footpath of rotor; Footpath at rotor upwards also is provided with at least one axial displacement checkout gear, and said axial displacement checkout gear is connected in the axial displacement control system.
The technical scheme of this utility model also has: the said axial displacement checkout gear of radially placing is a Hall element.
The technical scheme of this utility model also has: said Hall element is 4, is uniformly distributed with along the circumferencial direction of rotor.
The technical scheme of this utility model also has: the number of said radial permanent magnet bearing is 2, is positioned at two ends of rotor.
The technical scheme of this utility model also has: said axial displacement control system comprises displacement signal processor, Control in active magnetic bearings control device and power amplifier; The axial displacement signal of the displacement detector output that said displacement signal processor will radially be placed flows to the Control in active magnetic bearings control device after amplifying union, the influence of elimination radial displacement to axial displacement detecting; Said Control in active magnetic bearings control device becomes the rotor axial displacement voltage control signal through the control strategy computing with the radial displacement conversion of signals, and said power amplifier converts the rotor axial displacement voltage control signal in axial single electromagnetic bearing solenoid electric current.
The technical scheme of this utility model also has: said Control in active magnetic bearings control device is the PID controller.
The beneficial effect of this utility model is: this magnetic suspension manual heart pump is employed in the situation of change that the Hall element of radially installing is measured the magnetic induction density B of radial permanent magnet bearing; Reflect the axial displacement of rotor; And be used for the axial control procedure of rotor; Realized axial direction initiative suspending, driven suspension radially, accomplished space five-freedom suspension process, had the following advantages:
(1) do not increase part to be detected, system structure is simple, has shortened the axial length of heart pump;
(2) utilize the changes of magnetic field of radial permanent magnet bearing itself, adopt Hall element to measure rotor displacement, highly sensitive, volume is little, is easy to install;
(3) the Hall element low price has reduced system cost;
(4) Hall element is installed in radially, can directly not contact with blood, and avoid displacement transducer to be installed in the trouble of on exit guide blade, boring wire guide when axial, is convenient to part processing and assembling, and has strengthened the sealing property of system;
(5) decoupling algorithm of the arrangement of Hall element and output voltage has been eliminated the rotor radial displacement to the Hall element output voltage influence, and therefore, the output voltage of Hall element changes the axial displacement situation of change that has reflected rotor fully.
Description of drawings
Fig. 1 is the magnetic suspension manual heart structural representation;
Fig. 2 is a magnetic suspension manual heart pump control system structural representation;
Fig. 3 is a Hall element radial arrangement position view;
Fig. 4 is a Hall element principle sketch;
Fig. 5 is the relation of Permanent-magnet bearing rotor magnetic induction density B and rotor radial displacement, B component diametrically;
Fig. 6 is the relation of Permanent-magnet bearing rotor magnetic induction density B and rotor axial displacement, B component in the axial direction;
Fig. 7 is the VH-B curve of Hall element;
Fig. 8 is a rotor displacement sketch map front view;
Fig. 9 is a rotor displacement sketch map left view.
Wherein, 1. before stator, 2. rear guide vane, 3. rotor, 4. Hall element, 5. radial permanent magnet bearing, 6. axial single electromagnetic bearing, 7. stator, the 8. pump housing, 9. displacement signal processor, 10. Control in active magnetic bearings control device, 11. power amplifiers.
The specific embodiment
Below in conjunction with accompanying drawing, this utility model is specified.This magnetic suspension manual heart is equipped with stator 7 in the pump housing 8; Rotor 3 is arranged in stator 7; Rotor 3 axial relevant positions are provided with at least one axial single electromagnetic bearing 6; The radially relevant position of rotor 3 is provided with at least one radial permanent magnet bearing 5, radially is provided with the radial displacement checkout gear in the relevant position in the rear end with rotor 3 simultaneously, and the radial displacement checkout gear is connected with the axial displacement control system.The radial displacement checkout gear adopts Hall element 4, and Hall element 4 has four, and they are along the circumferential direction evenly installed.Radial permanent magnet bearing 5 has two.
Hall element 4 is to utilize Hall effect to realize a kind of pick off of magnetoelectricity conversion.It is the magnetic field of B that Hall element places magnetic induction; Magnetic direction when electric current I c flows through thin slice, will produce electromotive force VH perpendicular to thin slice on perpendicular to the direction in electric current and magnetic field; This phenomenon is called Hall effect, and this electromotive force is called Hall voltage.The exciting current Ic that flows into is big more, and the magnetic induction density B that acts on the thin slice is big more, and Hall voltage is also high more.Magnetic direction is opposite, and the direction of Hall voltage also changes thereupon, so Hall element 4 can be used for measure static magnetic field or alternating magnetic field.Therefore, when the magnetic induction density B through Hall element 4 changed, Hall voltage VH also changed thereupon.
In magnetic suspension manual heart pump shown in Figure 1, on the axis at Hall element 4 places, the distribution vertically of the magnetic induction density B of radial permanent magnet bearing 5 is as shown in Figure 5.Visible by Fig. 6, component and the axial displacement diametrically of radial permanent magnet bearing 5 magnetic induction density B is non-linear relation, and is the variation maximum between the 0-2mm in axial displacement.
The output voltage V of Hall element 4 and the relation of magnetic induction density B are as shown in Figure 7, and the output voltage and the magnetic induction of visible Hall element 4 are linear.Because the axial displacement scope of rotor 3 is very little, generally between-0.2mm～0.2mm, in this scope, can be similar to and thinks that magnetic induction density B is directly proportional with axial displacement.Therefore, can think that the output voltage of Hall element 4 is also linear with the axial displacement of rotor 3.
The rotor 3 of radial permanent magnet bearing 5 is except motion vertically; Also radially motion; When rotor 3 radially moves slight distance; The magnetic induction of Hall element 4 test surfaces also can change, and causes Hall element 4 that certain output voltage is arranged, thereby makes Control in active magnetic bearings control device 10 send wrong control signal.So, in order to eliminate the influence of radial displacement to Hall element 4 outputs, 4 Hall elements 4 of symmetric arrangement in a sagittal plane.
Utilize this arrangement elimination radial displacement to the ultimate principle of Hall element 4 output influences to be: the output voltage of supposing Hall element 4 is respectively V1～V4, and when rotor 3 was suspended in the centre position, the output of Hall element 4 was V0.Consider the output of four Hall elements 4 and the relation of rotor 3 displacements.Suppose that rotor 3 radially departs from equilbrium position Δ x, Δ y, axially depart from equilbrium position Δ z, each pick off is output as so
V1=?V0?+?ΔVy?+?ΔVz
V2=?V0?+?ΔVx?+?ΔVz
V3=?V0?–?ΔVy?+?ΔVz
V4=?V0?-?ΔVx?+?ΔVz
V=V1+V2+V3+V4=4V0+4ΔVz=4(V0+ΔVz) （1）
Wherein, Δ Vx representes the influence of radial displacement Δ x to sensor output voltage, and Δ Vy representes the influence of radial displacement Δ y to sensor output voltage, and Δ Vz representes the influence of axial displacement z to sensor output voltage.Because Δ x, Δ y, Δ z with respect to rotor size, are in a small amount, so radial displacement Δ x only influences along the output voltage of the pick off 2,4 of x direction layout, radial displacement Δ y only influences along the output voltage of the pick off 1,3 of y direction layout.
Can know that by formula (1) after the output voltage addition with 4 Hall elements, total output voltage V is only relevant with axial displacement z, and is irrelevant with radial displacement Δ x and Δ y.It is thus clear that utilize this arrangement; Just can eliminate the influence of radial displacement through simple decoupling zero computing to Hall element 4 output results; The displacement signal of finally delivering to Control in active magnetic bearings control device 10 has only comprised axial displacement signal; And amplified the output voltage of Hall element 4, solved the little drawback of single Hall element output voltage.
The axial displacement control system comprises displacement signal processor 9, Control in active magnetic bearings control device 10 and power amplifier 11; The radial displacement signal that displacement signal processor 9 is exported the radial displacement checkout gear flows to Control in active magnetic bearings control device 10 after amplifying union, the influence of elimination radial displacement to axial displacement detecting; Control in active magnetic bearings control device 10 becomes rotor 3 axial displacement voltage control signals through the control strategy computing with the radial displacement conversion of signals; Power amplifier 11 converts rotor 3 axial displacement voltage control signals in axial single electromagnetic bearing 6 solenoids electric current, in order to produce needed electromagnetic force.
Used Control in active magnetic bearings control device 10 is the PID controller.
Certainly; Above-mentioned explanation is not the restriction to this utility model; This utility model also be not limited only to above-mentioned for example, variation, remodeling, interpolation or replacement that those skilled in the art are made in the essential scope of this utility model also belong to the protection domain of this utility model.
Claims (6)
1. magnetic suspension manual heart pump; Comprise stator and rotor; It is characterized in that: on rotor axial, be provided with at least one axial single electromagnetic bearing; Upwards be provided with at least two radial permanent magnet bearings in the footpath of rotor, upwards also be provided with at least one axial displacement checkout gear in the footpath of rotor, said axial displacement checkout gear is connected in the axial displacement control system.
2. according to the described magnetic suspension manual heart pump of claim 1, it is characterized in that: the said axial displacement checkout gear of radially placing is a Hall element.
3. according to the described magnetic suspension manual heart pump of claim 2, it is characterized in that: said Hall element is 4, is uniformly distributed with along the circumferencial direction of rotor.
4. according to the described magnetic suspension manual heart pump of claim 1, it is characterized in that: the number of said radial permanent magnet bearing is 2, is positioned at two ends of rotor.
5. according to the described magnetic suspension manual heart pump of claim 1; It is characterized in that: said axial displacement control system comprises displacement signal processor, Control in active magnetic bearings control device and power amplifier; The axial displacement signal of the displacement detector output that said displacement signal processor will radially be placed flows to the Control in active magnetic bearings control device after amplifying union, the influence of elimination radial displacement to axial displacement detecting; Said Control in active magnetic bearings control device becomes the rotor axial displacement voltage control signal through the control strategy computing with the radial displacement conversion of signals, and said power amplifier converts the rotor axial displacement voltage control signal in axial single electromagnetic bearing solenoid electric current.
6. according to the described magnetic suspension manual heart pump of claim 5, it is characterized in that: said Control in active magnetic bearings control device is the PID controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120158488U CN202128743U (en) | 2011-05-18 | 2011-05-18 | Magnetically-suspended artificial heart pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120158488U CN202128743U (en) | 2011-05-18 | 2011-05-18 | Magnetically-suspended artificial heart pump |
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| Publication Number | Publication Date |
|---|---|
| CN202128743U true CN202128743U (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120158488U Expired - Fee Related CN202128743U (en) | 2011-05-18 | 2011-05-18 | Magnetically-suspended artificial heart pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103768669A (en) * | 2014-01-23 | 2014-05-07 | 苏州大学 | Magnetic suspension artificial heart magnetic suspension power supply and control method thereof |
| CN110131179A (en) * | 2019-06-27 | 2019-08-16 | 成都理工大学 | A kind of superconduction core Structure of RCP suitable for nuclear power station primary cycle main pump |
-
2011
- 2011-05-18 CN CN201120158488U patent/CN202128743U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103768669A (en) * | 2014-01-23 | 2014-05-07 | 苏州大学 | Magnetic suspension artificial heart magnetic suspension power supply and control method thereof |
| CN110131179A (en) * | 2019-06-27 | 2019-08-16 | 成都理工大学 | A kind of superconduction core Structure of RCP suitable for nuclear power station primary cycle main pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120201 Termination date: 20140518 |