WO2020220857A1 - 一种高效率磁力耦合悬浮泵 - Google Patents

一种高效率磁力耦合悬浮泵 Download PDF

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Publication number
WO2020220857A1
WO2020220857A1 PCT/CN2020/080097 CN2020080097W WO2020220857A1 WO 2020220857 A1 WO2020220857 A1 WO 2020220857A1 CN 2020080097 W CN2020080097 W CN 2020080097W WO 2020220857 A1 WO2020220857 A1 WO 2020220857A1
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WIPO (PCT)
Prior art keywords
magnetic
rotor
assembly
levitation
stator
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Application number
PCT/CN2020/080097
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English (en)
French (fr)
Inventor
尹成科
Original Assignee
苏州苏磁智能科技有限公司
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Application filed by 苏州苏磁智能科技有限公司 filed Critical 苏州苏磁智能科技有限公司
Priority to US17/288,193 priority Critical patent/US11754076B2/en
Publication of WO2020220857A1 publication Critical patent/WO2020220857A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/10—Location thereof with respect to the patient's body
    • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
    • A61M60/196—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body replacing the entire heart, e.g. total artificial hearts [TAH]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/20—Type thereof
    • A61M60/205—Non-positive displacement blood pumps
    • A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/40—Details relating to driving
    • A61M60/403—Details relating to driving for non-positive displacement blood pumps
    • A61M60/419—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/40—Details relating to driving
    • A61M60/403—Details relating to driving for non-positive displacement blood pumps
    • A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/80—Constructional details other than related to driving
    • A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
    • A61M60/81—Pump housings
    • A61M60/814—Volutes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/80—Constructional details other than related to driving
    • A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
    • A61M60/818—Bearings
    • A61M60/82—Magnetic bearings
    • A61M60/822—Magnetic bearings specially adapted for being actively controlled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/027—Details of the magnetic circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088—Testing machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0094—Indicators of rotational movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4293—Details of fluid inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/622—Adjusting the clearances between rotary and stationary parts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/09—Structural association with bearings with magnetic bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

Definitions

  • This application relates to the field of magnetic suspension and pumps, and in particular to a high-efficiency magnetic coupling suspension pump for fluid transportation.
  • the pump is the basic device for fluid delivery.
  • Traditional pumps are generally composed of a motor, a rotating shaft, a dynamic sealing device of the shaft, and an impeller and a volute fixed at the end of the rotating shaft.
  • the dynamic sealing device has problems such as frictional shear, leakage, pollution, and failure of the fluid.
  • bearing frictional shear will damage the effective components of the fluid.
  • leakage and pollution caused by seal failure are even more unacceptable.
  • the present invention discloses a magnetic coupling suspension pump, which has high driving efficiency. There is no mechanical contact between the rotor and the stator during operation, which completely avoids the frictional shear of the bearing and does not require any dynamic seal. , It effectively avoids leakage and pollution, and has high reliability.
  • the magnetic coupling suspension pump disclosed in the present invention consists of a stator body and a volute containing a rotor.
  • the stator body contains a magnetic levitation stator assembly and a magnetic coupling stator assembly.
  • the rotor contains a magnetic levitation rotor assembly and a magnetic coupling rotor assembly.
  • the magnetic levitation stator assembly and the magnetic levitation rotor assembly constitute the magnetic levitation assembly, and the magnetic coupling stator assembly and the magnetic coupling rotor assembly are constituted Magnetic coupling assembly.
  • the magnetic suspension assembly generates a single radial magnetic pole and magnetic field along the circumferential direction
  • the magnetic coupling assembly generates a radial periodic magnetic pole and magnetic field along the circumferential direction.
  • the magnetic levitation component and the magnetic coupling component make the rotor completely suspend and rotate in the volute of the stator body.
  • the rotor is provided with an impeller that rotates with the rotor.
  • the volute is provided with a fluid inlet and a fluid outlet. When the fluid flows in the volute , Which fills the space between the inner wall of the volute and the rotor, is pushed by the impeller on the rotating rotor.
  • the magnetic suspension assembly When the magnetic coupling suspension pump disclosed in the present invention is working, the magnetic suspension assembly provides 5 free stable controls for the rotor through the interaction force of the magnetic field. Among these 5 degrees of freedom, 2 degrees of freedom for tilting and 1 degree of freedom for axial displacement of the rotor are passively stable, while 2 degrees of freedom for the radial direction are actively controlled and stable.
  • the magnetic levitation stator assembly contains a rotor position sensor to monitor the displacement of the rotor in real time.
  • the control circuit generates a current in the coil of the magnetic levitation stator assembly according to the rotor displacement to achieve stable and controllable
  • the rotor is magnetically levitation.
  • the control circuit has zero power control and cycle zero power control algorithms, which reduces the power consumption of the magnetic levitation.
  • the magnetic coupling assembly provides the torque required for the rotor to rotate through the interaction torque of the magnetic field.
  • the volute and the stator body can be designed to be separable, and the volute can be easily replaced when needed, which is convenient to use and saves costs.
  • the magnetic coupling stator assembly can also be replaced with a motor stator winding wound with multi-phase coils to meet the requirements of special circumstances.
  • the magnetic coupling suspension pump disclosed in the present invention includes a stator body 1 and a volute 2.
  • the volute 2 has a fluid inlet 3 and a fluid outlet 4.
  • the volute 2 and the stator body 1 can be designed as a whole or can be designed to be separable.
  • Fig. 2(a) shows the rotor 5 in the volute 2
  • Fig. 2(b) further shows the rotor 5 in the volute 2 and the impeller 6 fixed on the rotor 5, respectively.
  • the volute 2 is provided with a fluid inlet 3 and a fluid outlet 4. When the fluid flows in the volute 2, it fills the space between the inner wall of the volute 2 and the rotor 5 and is pushed by the impeller 6 on the rotating rotor 5.
  • the volute 2 When the magnetic coupling suspension pump is working, the volute 2 is placed in the stator body 1.
  • the rotor 5 and the impeller 6 in the volute 2 are stably suspended and rotated under the action of the magnetic field generated by the stator body 1 to push the volute 2 in Fluid movement.
  • the rotor 5 and the impeller 6 When the rotor 5 and the impeller 6 are rotating, they are completely suspended and submerged in the fluid inside the volute 2, without any mechanical contact or friction with the volute 2, completely avoiding mechanical bearings and no dynamic seal.
  • FIG. 3 is a cross-sectional view of the overall structure of the magnetic coupling suspension pump. The working principle of this structure will be explained step by step below.
  • Figure 4(a)(b) shows the core structure of the magnetic levitation and motor related to the rotor 5 after removing the impeller 6 and other irrelevant parts, including the magnetic levitation rotor assembly composed of the magnetic ring 7, the auxiliary magnetic ring 8 and the auxiliary magnetic ring 7. 10.
  • the magnetic coupling rotor assembly 11 and the magnetic permeable ring 12 composed of multiple circumferential sector magnets.
  • Each magnetic ring of the magnetic levitation rotor assembly 10 is made of permanent magnetic material.
  • the magnetizing direction of the magnetic ring 7 is radially outward, the magnetizing direction of the auxiliary magnetic ring 8 is axially upward, and the magnetizing direction of the auxiliary magnetic ring 8 is axially downward.
  • the axial direction here refers to the only axis of symmetry of the rotor 5 that is the rotation axis, and the radial direction refers to the radial direction of the rotor 5 in a plane perpendicular to the rotation axis of the rotor 5.
  • the magnetic levitation rotor assembly 10 is characterized in that its magnetic poles are arranged as radial unipolar magnetic poles, and the generated magnetic field is a radial unipolar magnetic field, that is, the radial outside is N pole and the inside is S pole, or vice versa, the radial outside is S pole and N pole inside. Based on this radial unipolar magnetic field principle, there are many implementations of the magnetic levitation rotor assembly 10, and this patent will describe several typical implementations later.
  • the magnetic coupling rotor assembly 11 is composed of a plurality of sector-shaped permanent magnet arrays, and its magnetization and arrangement are characterized in that the magnetic poles are arranged as radial multi-pole magnetic poles, forming a circumferential multi-pole periodic magnetic field.
  • the typical magnetizing direction of each of the sector-shaped permanent magnets is radial magnetization, and when viewed from the radial outside, they are periodically arranged in NSNS... Rotate 180 degrees in turn.
  • Figure 4 shows an example of using four sector magnets to generate two pairs of radially arranged magnetic poles and a periodic magnetic field along the circumferential direction. Obviously, it is possible to set a periodic magnetic field with any other non-zero even number of magnetic poles.
  • the magnets of the magnetic coupling rotor assembly 11 can also be arranged in a manner called Halbach array, and each magnet in the magnetizing direction is rotated 90 degrees in turn, pressing ⁇ ...
  • the magnetization methods are arranged periodically in sequence. This arrangement can generate a periodic multi-pole magnetic field with increased intensity on one side, and the magnetic field on the other side is superimposed and canceled, which improves the utilization rate of the magnet.
  • the permeable ring 12 is the back iron of the magnetic suspension rotor assembly 10 and the magnetic coupling rotor assembly 11, which provides a closed loop for the magnetic flux of the magnetic suspension rotor assembly 10 and the magnetic coupling rotor assembly 11, and at the same time isolates the magnetic suspension rotor assembly 10 and the magnetic coupling rotor
  • the magnetic field of the component 11 prevents the two from interfering with each other.
  • Figure 5(a)(b) shows the core components related to the magnetic levitation function and motor function after removing the irrelevant parts of the stator body 1, including the stator core 13, auxiliary magnetic ring 14, auxiliary magnetic ring 15, and coil 16,
  • the rotor position sensor 17 the magnetic levitation stator assembly 19 composed of the control circuit 18, the magnetic coupling stator assembly 20 composed of the sector-shaped magnet array, and the motor 21.
  • the location of the control circuit 18 is marked in FIG. 3.
  • the function of the magnetic levitation stator assembly 19 is to make the rotor 5 suspend stably.
  • the rotor position sensor 17 detects the relative displacement between the rotor 5 and the stator body 1, and the control circuit 18 calculates and controls the magnitude and direction of the current in the coil 16 according to the displacement.
  • a magnetic field is generated in the stator core 13 to generate an interaction force on the magnetic suspension rotor assembly 10, and finally the relative position of the rotor 5 and the stator body 1 is within a set range.
  • the magnetic coupling stator assembly 20 is composed of several sector-shaped magnets, and the magnetic field arrangement formed by it is just opposite to the arrangement of the magnetic coupling rotor assembly 11, which means that the magnetizing direction and arrangement of the magnet array are also opposite.
  • the magnetic coupling stator assembly 20 is fixed on the rotating shaft of the motor 21 and rotates under the drive of the motor 21.
  • the magnetic coupling stator assembly 20 and the magnetic coupling rotor assembly 11 generate interaction torque through a magnetic field to drive the rotor 5 to rotate.
  • Fig. 6 puts the rotor core part shown in Fig. 4 and the stator core part shown in Fig. 5 together, which can correspond to the overall cross-sectional view of Fig. 3 one by one. So far, the structure of the present invention has been clearly disclosed.
  • Figure 7 further reveals the principle of the magnetic levitation of the present invention.
  • Figure 7 (a) (b) (c) (d) shows the four different state sectional views of the same structure of the stator core 13, the coil 16 in the magnetic levitation stator assembly 19 and the magnetic ring 7 in the magnetic levitation rotor assembly 10 , So only the components are labeled in Figure 7(a), and the rest of the sub-pictures can correspond one to one.
  • the cross-sectional view also shows the structure on both sides of the rotating shaft.
  • the auxiliary magnetic rings 8, 9, 14, 15 are not considered for the time being.
  • the intensity of the magnetic field generated in the air gap between the stator core 13 and the magnetic ring 7 is The circumferential direction is evenly distributed, and the resulting magnetic suspension force between the stator core 13 and the magnetic ring 7 is zero. It will be known from the following text that the resultant force of the magnetic coupling assembly is always zero. In the end, the combined force experienced by the magnetic ring 7, the magnetic suspension rotor assembly 10 and the rotor 5 is zero.
  • FIG. 7(c) shows the situation after the current is applied to the coil 16.
  • the magnetic field generated by the coil 16 in the stator core 13 and diffused into the air gap is added to the magnetic field generated by the magnetic ring 7 on one side, and subtracted from the magnetic field generated by the magnetic ring 7 on the other side.
  • the radial resultant force is no longer zero, and the control force related to the magnitude and direction of the coil current is generated.
  • the symbol F in Fig. 7(c) indicates the direction of control generated under the magnetic field described in the figure.
  • the control circuit 18 detects the position of the rotor through the rotor position sensor 17 and adjusts the magnitude of the control force, so that the two radial directions of the rotor 5 are always within the position range set in the stator body 1 to achieve suspension.
  • the control circuit 18 makes the rotor 5 slightly deviate from the center point of the stator body 1, so that the magnetic field force generated by each permanent magnet just offsets the gravity.
  • the control current in the coil 16 is also close to zero at this time, and the magnetic levitation power consumption can also be extremely low, close to zero.
  • This control algorithm is called zero power control.
  • the control circuit 18 can make the rotor 5 periodically move around the center point of the stator body 1, so that the permanent magnets generate The periodic magnetic field force can just offset the radial component of the additional periodic force.
  • the control current in the coil 16 can be minimized, and the power consumption of the magnetic levitation can also be minimized. It is usually much smaller than the electromagnetic force generated by the current in the coil 16 to resist the component generated by the additional periodic force in the radial direction. Required power consumption.
  • This control algorithm is called periodic zero power control.
  • Fig. 7(b) shows that when the rotor 5 is axially displaced relative to the stator body 1, the magnetic ring 7 in the rotor 5 and the stator core 13 in the magnetic levitation stator assembly 19 undergo the same displacement.
  • the magnetic field shown by the dotted line in FIG. 7(b) will be generated in the air gap between the stator core 13 and the magnetic ring 7.
  • This magnetic field is asymmetric in the axial direction and will generate an axial force, which is represented by the symbol F in Figure 7(c).
  • This force always makes the rotor 5 return to the initial position set by the stator body 1, which is a passive restoring force. Therefore, under the action of this passive restoring force, the rotor 5 has a degree of freedom in the axial direction. Passive and stable suspension.
  • FIG. 7(d) shows that when the rotor 5 is tilted relative to the stator body 1, the magnetic ring 7 in the rotor 5 and the stator core 13 in the magnetic levitation stator assembly 19 are tilted the same.
  • the magnetic field shown by the dotted line in FIG. 7(d) is generated in the air gap between the stator core 13 and the magnetic ring 7.
  • This magnetic field is symmetrical in the axial direction on both sides, so the axial force is zero, but it is asymmetrical to the tilt, and finally produces a moment that causes the rotor 5 to return to the initial setting posture, and the resulting return
  • the torque is represented by the symbol T in Figure 7(d).
  • the rotor 5 is passively and stably suspended in the two degrees of freedom of tilt under the action of this passive restoring torque.
  • the rotor 5 is actively controlled and stably levitation in 2 radial degrees of freedom, and in 1 axial degree of freedom and 2 tilt degrees of freedom. It is passive and stable. As a rigid body, the rotor 5 has a total of 6 degrees of freedom. So far, there are 5 degrees of freedom that are stably suspended.
  • zero power consumption control and periodic zero power consumption control are used to significantly reduce the power consumption of the magnetic levitation, which is close to zero.
  • the degree of freedom of passive suspension and stability does not consume power.
  • Figure 8(a) shows an improved scheme including auxiliary magnetic rings 8, 9, 14, 15, which further enhances the air gap magnetic field and improves efficiency.
  • Figure 8(a)(b)(c)(d) shows the stator core 13, coil 16 in the magnetic levitation stator assembly 19 and the magnetic ring 7 and auxiliary magnetic rings 8, 9, 14 in the magnetic levitation rotor assembly 10.
  • , 15 is a cross-sectional view of the same structure, so only the components are labeled in Figure 8(a), and the rest of the sub-pictures can be one-to-one correspondence. The sectional view only shows the structure on one side of the rotation axis.
  • auxiliary magnetic rings 14 and 15 are additionally provided on the stator core 13 of the magnetic levitation stator assembly 19, and auxiliary magnetic rings 8 and 9 are additionally provided on the magnetic ring 7 of the magnetic levitation rotor assembly 10.
  • These auxiliary magnetic rings can be set independently or not, but the basic principle of their setting is that the magnetic field generated in the air gap between the stator core 13 and the magnetic ring 7 is separate from the magnetic ring 7 in the air gap. The resulting magnetic fields are additive.
  • the addition mentioned here is characterized in that the direction of the magnetic field generated by each magnetic ring in the air gap is the same, and the amplitude increases after the magnetic field is superimposed.
  • Figure 8(b)(c)(d) Based on the basic principle that the magnetic field generated by the auxiliary magnetic ring in the air gap and the magnetic field generated by the magnetic ring 7 alone are additive, there are several types of magnetic fields shown in Figure 8(b)(c)(d). Ring magnetization direction and arrangement scheme.
  • Figure 8 shows a variety of arrangements, illustrating the basic principle of the addition of the magnetic field generated by the auxiliary magnetic ring and the magnetic field generated by the magnetic ring 7 alone in the air gap under different auxiliary magnetic ring magnetization configurations. In the configuration shown in Fig. 8(a)(b), the magnetic field lines generated by the magnetic ring 7 and the magnetic field lines generated by the other auxiliary magnetic rings are drawn at the same time.
  • Figure 8(c)(d) only draws the magnetic field lines generated by the auxiliary magnetic ring.
  • the last degree of freedom that needs to be controlled for the rotor 5 is the degree of freedom of rotation, which is realized by a magnetic coupling.
  • FIG. 9 shows a magnetic coupling assembly including a magnetic coupling stator assembly 20 and a magnetic coupling rotor assembly 11.
  • the magnetic coupling stator assembly 20 generates a circumferentially distributed periodic multi-pole magnetic field
  • the magnetic coupling rotor assembly 11 and the magnetic coupling stator assembly 20 generate the same magnetic field distribution.
  • the relative angular displacement of the magnetic coupling stator assembly 20 and the magnetic coupling rotor assembly 11 is zero as shown in Figure 9(a)
  • the lines of magnetic force between the two alternate in the circumferential direction as shown by the dashed line.
  • Each magnetic pole in the circumferential direction is symmetrically distributed on both sides, so the resultant force and moment are all zero.
  • the magnetic field lines between the two are alternated periodically in the circumferential direction as shown by the dotted line. For each magnetic pole in the circumferential direction, it always turns to the same side. In this case, the resultant force generated is zero, but the resultant moment is not zero. Therefore, the magnetic coupling can transmit torque between the stator and the rotor, and the magnitude of the transmitted torque is related to the relative angle of the magnetic coupling stator assembly 20 and the magnetic coupling rotor assembly 11.
  • the magnetic coupling stator assembly 20 is fixed on the shaft of the motor 21, so when the motor 21 rotates, it will drive the rotor 5 and the impeller 6 to rotate, thereby driving the fluid in the volute 2 to move. So far, all the 6 degrees of freedom of the rotor 5 have realized fully controllable suspension and rotation.
  • the magnetic coupling completes the transmission of torque completely through permanent magnets.
  • the energy loss during the transmission of torque is extremely low compared to the energy required by the pump. It can be considered as zero.
  • the magnetic levitation stator assembly 19 and the magnetic levitation rotor assembly 10 constitute a magnetic levitation assembly, which is characterized by generating a radial unipolar magnetic pole and a magnetic field in the circumferential direction, and its function is to realize the magnetic levitation of the rotor 5.
  • the magnetic coupling stator assembly 20 and the magnetic coupling rotor assembly 11 constitute a magnetic coupling assembly, which is characterized by generating a radial non-zero even number of periodic magnetic poles and magnetic fields along the circumferential direction, and its function is to drive the rotor to rotate.
  • the above embodiments completely reveal the principle of magnetic levitation and rotation driving of the present invention.
  • the magnetic coupling suspension pump disclosed in the present invention has no mechanical frictional shear between the rotor 5 and the volute 2, and does not require any mechanical bearings and dynamic seals, effectively avoiding leakage and pollution, and has high reliability.
  • the power consumption of the magnetic levitation is extremely low, close to zero.
  • the magnetic coupling has no energy loss during the process of torque transmission. Therefore, almost all the output work of the motor 21 is used to drive the fluid, and the efficiency of the whole machine is very high.
  • motor stator windings wound with multi-phase coils can also be used instead of the magnetic coupling stator assembly 20 and arranged in the same position.
  • the windings around the stator of the motor will generate a rotating magnetic field in space when the coils of each phase are supplied with phase-difference currents.
  • the magnetic coupling rotor The torque generated by the component 11 is the same in effect.
  • the stator winding of the motor and the magnetic coupling rotor assembly 11 actually constitute a conventional permanent magnet motor. Compared with using the magnetic coupling stator assembly 11 to drive the rotor 5 to rotate, the efficiency of the permanent magnet motor will be lower than that of the motor 21.

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Abstract

一种高效率磁力耦合磁悬浮泵，包含定子本体（1）和含有转子（5）的蜗壳（2），定子本体（1）内含有磁悬浮定子组件（19）和磁力耦合器定子组件（20），转子（5）内含有磁悬浮转子组件（10）和磁力耦合器转子组件（11）；磁悬浮定子组件（19）和磁悬浮转子组件（10）组成磁悬浮组件，沿周向产生径向单极磁极和磁场，使得转子悬浮；磁力耦合器定子组件（20）和磁力耦合器转子组件（11）组成磁力耦合器组件，沿周向产生径向非零偶数个周期磁极和磁场，驱动转子旋转。该磁悬浮泵工作时，转子在磁场力的作用下完全悬浮，转动时与定子无任何机械摩擦或剪切，无需任何动密封，可靠性高。

Description

一种高效率磁力耦合悬浮泵 技术领域
本申请涉及磁悬浮和泵领域，尤其涉及一种用于流体输送的高效率磁力耦合悬浮泵。
背景技术
泵是流体输送的基础装置。传统泵一般由电机、转轴、轴的动密封装置和固定于转轴端部的叶轮、蜗壳等部件构成。在使用过程中动密封装置存在对流体的摩擦剪切、泄漏、污染、失效等难题。在输送血液、蛋白质大分子药物、超净原料、燃料等敏感流体时，轴承摩擦剪切会损伤流体有效成分。在人工心脏、核能、太空领域，密封失效导致的泄露和污染更是不可接受的。
有鉴于现有技术的不足，本发明公开了一种磁力耦合悬浮泵，具有很高的驱动效率，运转时转子与定子没有任何机械接触，完全避免了轴承的摩擦剪切，不需要任何动密封，有效的避免了泄露和污染，可靠性高。
发明内容
本发明公开的磁力耦合悬浮泵由定子本体和含有转子的蜗壳组成。定子本体内含有磁悬浮定子组件和磁力耦合器定子组件，转子内含有磁悬浮转子组件和磁力耦合器转子组件，磁悬浮定子组件和磁悬浮转子组件构成磁悬浮组件，磁力耦合器定子组件和磁力耦合器转子组件构成磁力耦合器组件。磁悬浮组件沿周向产生径向单一磁极和磁场，磁力耦合器组件沿周向产生径向周期磁极和磁场。磁悬浮组件和磁力耦合器组件使得转子在定子本体的蜗壳内完全悬浮和旋转，转子上设置有随转子一起转动的叶轮，蜗壳上设置有流体入口和流体出口，流体在蜗壳内流动时，充斥在蜗壳内壁和转子之间的空间，被旋转的转子上的叶轮推动。
本发明公开的磁力耦合悬浮泵在工作时，磁悬浮组件通过磁场的相互作用力，为转子提供5个自由的稳定控制。这5个自由度中，转子的2个倾斜自由度、1个轴向位移自由度是被动稳定的，而径向的2个自由度是主动控制稳定的。为了实现径向2个自由度的转子位置的主动控制，磁悬浮定子组件中含有转子位置传感器，实时监测转子的位移，控制电路根据转子位移在磁悬浮定子组件的线圈中产生电流，实现稳定可控的转子磁悬浮。控制电路有零功耗控制和周期零功耗控制算法，降低了磁悬浮的功耗。磁力耦合器组件通过磁场的相互作用力矩，为转子提供旋转所需的转矩。
在转子旋转时，转子所有的6个自由度都在磁悬浮和电机的控制下，在定子本体及蜗壳中设定位置范围内转动，带动叶轮一起转动，推动蜗壳中的流体运动。转子和叶轮完全 且仅仅浸入在蜗壳内的流体中，转动时转子及叶轮等部件和定子本体各部件之间没有任何摩擦，完全避免了任何动密封结构。
蜗壳与定子本体可设计为可分离的，在需要时可以方便的更换蜗壳，方便使用，节省成本。
转子在稳定旋转时，磁悬浮的功耗非常低。磁力耦合器在传递转矩的过程中，没有能量损失。因此，电机输出功几乎全部用于驱动流体，整机效率非常高。
可选地，磁力耦合器定子组件也可以用绕有多相线圈的电机定子绕组代替，以满足特殊情况的需求。
附图说明
图1整体结构
图2部件
图3整体剖面
图4转子
图5定子
图6转子和定子
图7磁悬浮组件
图8磁悬浮组件的多种实施方案
图9磁力耦合器组件
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。
本发明所公开的磁力耦合悬浮泵，如图1所示，包含定子本体1，蜗壳2。蜗壳2上有流体入口3和流体出口4。蜗壳2和定子本体1可以设计为一体，也可设计为可分离的。图2(a)展示了蜗壳2中的转子5，图2(b)进一步分别展示了蜗壳2中转子5，以及固定于转子5上的叶轮6。蜗壳2上设置有流体入口3和流体出口4。流体在蜗壳2内流动时，充斥在蜗壳2内壁和转子5之间的空间，被旋转的转子5上的叶轮6推动。
磁力耦合悬浮泵在工作时，蜗壳2置于定子本体1中，蜗壳2中的转子5及叶轮6在定子本体1产生的磁场的作用下稳定的悬浮、旋转，推动蜗壳2中的流体运动。转子5和叶轮6在旋转时，完全悬浮浸没在蜗壳2内流体内部，与蜗壳2没有任何机械接触和摩擦， 完全避免了机械轴承，不需要任何动密封。
本发明的关键在于，如何能使得转子5在定子本体1中的蜗壳2内稳定的悬浮和旋转。图3是磁力耦合悬浮泵整体结构的剖面图。下面将对该结构的工作原理进行逐步阐释。
图4(a)(b)给出了转子5去掉叶轮6等无关部件后，与磁悬浮和电机相关的核心结构，包含由磁环7、辅助磁环8和辅助磁环7组成的磁悬浮转子组件10、由多片周向扇形磁铁组成的磁力耦合器转子组件11、导磁环12。
磁悬浮转子组件10的各磁环由永磁材料构成。磁环7的充磁方向为径向向外，辅助磁环8的充磁方向轴向向上，辅助磁环8的充磁方向轴向向下。此处的轴向，即转子5的唯一的对称轴即旋转轴，而径向是指与转子5的旋转轴所垂直的平面内的转子5半径方向。磁悬浮转子组件10的特征在于，其磁极排布为径向单极磁极，所产生的磁场为径向单极磁场，即径向外侧为N极、内侧为S极，或者相反，径向外侧为S极、内侧为N极。基于这一径向单极磁场原则，磁悬浮转子组件10有许多种实施方案，本专利将在后面对典型的几种实施方案加以说明。
磁力耦合器转子组件11由多片扇形永磁体阵列构成，其充磁与排列方式的特征在于，其磁极排布为径向多极磁极，形成周向多极周期磁场。为了产生周向多极周期磁场，所述各扇形永磁体的典型充磁方向为径向充磁，且从径向外侧看去，呈NSNS...周期性排布，每个磁铁充磁方向依次旋转180度。图4中给出了用4块扇形磁铁沿周向产生2对径向排布磁极和周期磁场的示例。显然，设置为其它任意非零偶数个磁极的周期磁场都是可以的。
可选地，磁力耦合器转子组件11的磁铁还可采用一种称为Halbach阵列的排布方式，充磁方向每个磁铁依次旋转90度，按↑→↓←↑→↓←...的充磁方式周期依次排布，这种排布方式可在一侧产生强度叠加增强的周期多极磁场，而另一侧的磁场叠加相消，提高磁铁的利用率。
导磁环12的是磁悬浮转子组件10和磁力耦合器转子组件11的背铁，为磁悬浮转子组件10和磁力耦合器转子组件11的磁通量提供闭合回路，同时隔离磁悬浮转子组件10和磁力耦合器转子组件11的磁场，使两者不相互干扰。
图5(a)(b)给出了定子本体1去除无关部件后，与磁悬浮功能和电机功能相关的核心部件，包含由定子铁芯13，辅助磁环14，辅助磁环15，线圈16，转子位置传感器17，控制电路18组成的磁悬浮定子组件19，由扇形磁铁阵列构成的磁力耦合器定子组件20，和电机21。控制电路18的位置在图3中标出。
磁悬浮定子组件19的作用是使得转子5稳定悬浮，其中，转子位置传感器17检测 转子5与定子本体1之间的相对位移，控制电路18根据该位移，计算并控制线圈16中电流的大小和方向，在定子铁芯13中产生磁场，对磁悬浮转子组件10产生相互作用力，最终使得转子5与定子本体1的相对位置在设定的范围内。
磁力耦合器定子组件20由数片扇形磁铁构成，其形成的磁场排布刚好与磁力耦合器转子组件11的排布相反，这意味着其磁铁阵列的充磁方向和排列也是相反的。磁力耦合器定子组件20固定在电机21的转轴上，在电机21的驱动下旋转。磁力耦合器定子组件20与磁力耦合器转子组件11通过磁场产生相互作用转矩，驱动转子5旋转。
图6将图4所示的转子核心部件和图5所示的定子核心部件放到了一起，可以与图3整体剖面图一一对应。至此，已经清楚的揭示了本发明的结构。
图7进一步揭示了本发明的磁悬浮原理。图7(a)(b)(c)(d)展示的是磁悬浮定子组件19中的定子铁芯13、线圈16和磁悬浮转子组件10中的磁环7的相同结构的4个不同状态剖面图，因此只在图7(a)中对各部件进行了标号，其余子图可以一一对应。该剖面图同时画出了旋转轴的两侧结构。暂时不考虑辅助磁环8、9、14、15，由于磁环7的产生的磁场是径向单极磁场，在定子铁芯13和磁环7之间的气隙内产生的磁场的强度沿周向是均匀分布的，在定子铁芯13和磁环7之间的产生的磁悬浮合力为零。又从后文会得知磁力耦合器组件的合力总为零。最终，磁环7，以及磁悬浮转子组件10和转子5所受的合力为零。
图7(c)展示了线圈16中通入电流后的情况。此时，线圈16在定子铁芯13中产生并扩散到气隙中的磁场，在一侧与磁环7产生的磁场相加，而在另一侧与磁环7产生的磁场相减，磁场不再对称，径向合力不再为零，产生了与线圈电流大小和方向相关的控制力。图7(c)中用符号F指明了在图中所述磁场情况下产生的控制的方向。控制电路18通过转子位置传感器17检测转子的位置，调整控制力的大小，就可以实现转子5的径向2个方向始终处于定子本体1中设定的位置范围内，实现悬浮。
当转子5稳定的悬浮在定子本体1的中心位置附近时，由于周向气隙内的磁场周向对称，各永久磁铁产生的磁场力合力为零，因此线圈16中的控制电流也接近零，磁悬浮功耗可以极低，接近于零。
当因为整个泵体倾斜或加速，重力(加速度力)在径向产生分量时，控制电路18使得转子5稍微的偏离定子本体1的中心点，使得各永久磁铁产生的磁场力刚好抵消掉重力的径向分量，此时线圈16中的控制电流也接近零，磁悬浮功耗也可以极低，接近于零。这一控制算法称为零功耗控制。
当由于周期性的振动，或者转子5旋转引起的附加周期性力在径向产生分量时，控制电路18可以使得转子5在定子本体1的中心点附近周期性地运动，使得各永久磁铁产生的周期性的磁场力刚好可以抵消附加周期性力在径向产生的分量。此时，此时线圈16中的控制电流可以最小化，磁悬浮功耗也得以最小化，通常远小于单纯用线圈16中的电流产生的电磁力来抵抗附加周期性力在径向产生的分量所需要的功耗。这一控制算法称为周期零功耗控制。
图7(b)展示了转子5发生相对于定子本体1的轴向位移时，转子5中的磁环7与磁悬浮定子组件19中的定子铁芯13发生同样的位移。此时，定子铁芯13与磁环7之间的气隙中将产生图7(b)虚线所示的磁场。这一磁场在轴向上是不对称的，将产生轴向力，所产生的轴向力在图7(c)中用符号F表示。这一力总是使得转子5回到定子本体1所设定的初始位置，是一种被动恢复力，因此转子5在这一被动恢复力的作用下，在轴向这1个自由度上是被动稳定悬浮的。
图7(d)展示了转子5发生相对于定子本体1发生倾斜的情况时，转子5中的磁环7与磁悬浮定子组件19中的定子铁芯13发生同样的倾斜。此时，定子铁芯13与磁环7之间气隙内产生图7(d)虚线所示的磁场。这一磁场是在两侧轴向上是对称的，因此轴向力为零，但在对于倾斜来说是不对称的，最终产生令转子5回到初始设定姿态的力矩，所产生的回复力矩在图7(d)中用符号T表示。也就是说，转子5在这一被动回复力矩的作用下，在倾斜的2个自由度上是被动稳定悬浮的。
至此，已经利用一个简化的结构完全阐明了本发明的磁悬浮原理，得知转子5在2个径向自由度上是主动控制稳定悬浮的，在1个轴向自由度和2个倾斜自由度上是被动稳定悬浮的。转子5作为一个刚体，一共有6个自由度，至此已经有5个自由度是稳定悬浮的。
在主动控制悬浮自由度中，使用零功耗控制和周期零功耗控制，使得磁悬浮的功耗显著降低，接近于零。被动悬浮稳定的自由度不消耗功率。
图8(a)给出了包含辅助磁环8、9、14、15的改进方案，进一步增强了气隙磁场，提高了效率。图8(a)(b)(c)(d)展示的都是磁悬浮定子组件19中的定子铁芯13、线圈16和磁悬浮转子组件10中的磁环7和辅助磁环8、9、14、15相同结构的剖面图，因此只在图8(a)中对各部件进行了标号，其余子图可以一一对应。该剖面图仅画出了旋转轴一侧的结构。在磁悬浮定子组件19的定子铁芯13上另外设置2个辅助磁环14和15，在磁悬浮转子组件10的磁环7上另外设置辅助磁环8、9。这些辅助磁环都可以独立设置或不设置，但其设置的基本原则是，其在定子铁芯13和磁环7之间的气隙中产生的磁场，与磁环7单 独在该气隙中产生的磁场是相加的。此处所说的相加，特征是各磁环在所述气隙中产生的磁场方向相同，磁场叠加后幅值增加。
基于上述辅助磁环产生的磁场在气隙中产生的磁场与磁环7所单独产生的磁场是相加的这一基本原则，又有图8(b)(c)(d)的数种磁环充磁方向和排布方案。图8中展示了多种排布方案，说明了在不同的辅助磁环充磁配置下，辅助磁环所产生磁场与磁环7所单独产生的磁场在气隙内相加的基本原理。图8(a)(b)所展示的配置方案中同时画出了磁环7所产生的磁力线和其余辅助磁环所产生的磁力线。图8(c)(d)仅画出了辅助磁环产生的磁力线。可见，在这些配置方案中，在气隙中每个辅助磁环所产生的磁力线与磁环7所产生的磁力线都是相加的。容易想到，对图8所示的磁环7和各辅助磁环的充磁方向进行反向、旋转，或者对图8中所展示的结构进行任何拆分和组合，将会许有多种满足在气隙中磁场相加的配置方案。至此，已经完全揭示了辅助磁环设置的基本原理，鉴于篇幅原因，此处不再将所有的配置方案一一列出，对于本技术领域的普通技术人员来说完全可以自行列出其它各种组合。
转子5最后一个需要控制的自由度是转动自由度，通过磁力耦合器来实现。
图9给出了包含磁力耦合器定子组件20和磁力耦合器转子组件11的磁力耦合器组件。磁力耦合器定子组件20产生的是周向分布的周期多极磁场，磁力耦合器转子组件11与磁力耦合器定子组件20产生的磁场分布刚好相反。当磁力耦合器定子组件20和磁力耦合器转子组件11的相对角位移为图9(a)所示为零时，两者之间的磁力线在周向是如虚线所示周期交替的，但对周向的每个磁极而言都是两侧对称分布的，因此产生的合力和合力矩都为零。而当磁力耦合器定子组件20和磁力耦合器转子组件11的相对角位移为图9(b)所示不为零时，两者之间的磁力线在周向如虚线所示除了是周期交替的，还对周向的每个磁极而言总是转向同一侧，在此种情况下所产生的合力为零，但合力矩不为零。因此，磁力耦合器可以在定子和转之间传递力矩，所传递的力矩大小与磁力耦合器定子组件20与磁力耦合器转子组件11的相对角度相关。磁力耦合器定子组件20固定在电机21的轴上，因此电机21旋转时就会带动转子5和叶轮6旋转，进而驱动蜗壳2中的流体运动。至此，转子5的所有6个自由度都实现了完全可控的悬浮和旋转。
磁力耦合器完全通过永久磁铁完成力矩的传递，在流体泵这种运行速度远低于介质中光速的情况下，相对于泵工作所需的能量来说，传递力矩过程中的能量损失极低，可以认为是零。
最后，磁悬浮定子组件19和磁悬浮转子组件10组成了磁悬浮组件，其特征是在于 沿周向产生径向单极磁极和磁场，其功能是实现转子5磁悬浮。磁力耦合器定子组件20和磁力耦合器转子组件11组成了磁力耦合器组件，其特征是沿周向产生径向非零偶数个周期磁极和磁场，其功能是驱动转子旋转。
上述实施方案完全揭示了本发明的磁悬浮和旋转驱动原理。本发明所揭示的磁力耦合悬浮泵，其转子5与蜗壳2无任何机械摩擦剪切、无需任何机械轴承和动密封，有效的避免了泄露和污染的发生，可靠性高。转子5稳定旋转时，磁悬浮的功耗极低，接近于零。磁力耦合器在传递力矩的过程中，没有能量损失。因此，电机21的输出功几乎全部用于驱动流体，整机的效率非常高。
作为一种可选的方案，也可以用绕有多相线圈的电机定子绕组代替磁力耦合器定子组件20，并设置在同样的位置。所述绕电机定子绕组，当各相线圈通入有相位差的电流时，将在空间中产生旋转磁场，与机械旋转的磁力耦合器定子组件20产生的旋转磁场相比，对磁力耦合器转子组件11产生的转矩，在效果上是相同的。所述电机定子绕组实际上与磁力耦合器转子组件11构成了常规的永磁电机。相比用磁力耦合器定子组件11驱动转子5旋转，所述永磁电机的效率会比电机21低，这是因为在这种泵的应用中，所述永磁电机的定子转子间气隙一般都很大。但在一些特殊场合下，例如人工心脏等植入式医疗器械、核能或者航天领域，希望完全避免轴承等机械部件，则可以采用这一可选方案。
以上仅是本发明的优选实施方式，并不用于限制本发明，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变型，这些改进和变型也应视为本发明的保护范围。

Claims (10)

  1. 一种磁力耦合悬浮泵，包括定子本体，和含有转子的蜗壳，所述定子本体内含有磁悬浮定子组件和磁力耦合器定子组件，所述转子内含有磁悬浮转子组件和磁力耦合器转子组件；所述磁悬浮定子组件和磁悬浮转子组件组成磁悬浮组件，其特征在于，沿周向产生径向单极磁极和磁场，使得转子悬浮；所述磁力耦合器定子组件和磁力耦合器转子组件组成磁力耦合器组件，其特征在于，沿周向产生径向非零偶数个周期磁极和磁场，驱动转子旋转。
  2. 如权利要求1所述磁悬浮组件使得转子径向2个自由度主动控制悬浮，轴向自由度被动悬浮，2个倾斜自由度被动悬浮；所述磁力耦合器组件驱动转子旋转；所述转子在旋转时与所述蜗壳无任何机械接触；所述磁力耦合悬浮泵无任何机械轴承，无任何动密封。
  3. 如权利要求1所述磁悬浮转子组件，含有磁环7和可选的辅助磁环；所述磁悬浮定子组件，含有定子铁芯13和可选的辅助磁环；所述的各个辅助磁环的特征在于，辅助磁环在铁芯13和磁环7之间的气隙中产生的磁场与在磁环7在所述气隙中产生的磁场相加，所述相加，特征是各磁环在气隙中产生的磁场方向相同，磁场叠加后幅值增加。
  4. 如权利要求1所述磁悬浮定子组件，还包含控制电路、转子位置传感器、线圈，所述控制电路的特征在于，通过转子位置传感器检测转子在定子本体中的相对位置，调整线圈中的电流，产生可控的磁悬浮力；进一步地，调整转子在定子本体中的相对位置，使得磁环7和各辅助磁环对转子产生径向恒定力，抵抗外部的径向力，实现零功耗控制；进一步地，所述控制电路通过周期性的调整转子在定子本体中的位置，使得磁环7和各辅助磁环对转子产生径向周期性的力，抵抗外部的周期性的径向力，实现周期零功耗控制，降低磁悬浮功耗。
  5. 如权利要求1所述的磁力耦合器包含的磁力耦合器定子组件和磁力耦合器转子组件，其特征在于，包含沿周向排列的磁铁，所述磁铁的充磁排布方式为依次旋转180度或者90度，产生任意非零偶数个磁极的周期性磁极和磁场。
  6. 如权利要求1所述的转子内含有背铁，为所述磁悬浮转子组件和所述磁力耦合器转子组件提供磁通量闭合回路，同时隔离所述磁悬浮转子组件和所述磁力耦合器转子组件的磁场，使两者不相互干扰。
  7. 如权利要求1所述磁力耦合悬浮泵中还包含电机，所述转子上还含有叶轮，其特征在于，所述磁力耦合器定子组件固定在所述电机的转轴上，在电机驱动下与转轴一起旋转，并传递转矩至所述磁力耦合器转子组件，带动转子和转子上的叶轮旋转，推动流体。
  8. 如权利要求1所述磁力耦合器转子组件，可选地，可以替换为绕有多相线圈的电机定子绕组，其特征在于，所述电机定子绕组中各相中通入有相位差的电流，产生空间旋转磁场，驱动磁力耦合器转子组件旋转。
  9. 如权利要求1所述的定子本体和蜗壳，其特征在于，可以设置为一体的，也可以设置为可分离的。
  10. 如权利要求1所述的蜗壳，包含流体入口和流体出口。
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