Magnetic suspension device for improving magnetic suspension control capability, motor and pump

Abstract

The utility model relates to a magnetic suspension device, motor and pump for increasing magnetic suspension control ability, including: enhancement coil, permanent magnet rotor, main shaft and stator assembly, two permanent magnet rotor are coaxial and distributed along up and down direction, two permanent magnet rotor are respectively and fixedly connected with main shaft, two permanent magnet rotor have the same magnetic pole number and the magnetic pole arrangement direction is opposite, the stator assembly has the stator assembly. The two stator assemblies are respectively located at the outer sides of the two permanent magnet rotors, the two stator assemblies respectively drive the two permanent magnet rotors to suspend and rotate through magnetic force, the enhanced winding comprises a plurality of enhanced coils, and the enhanced coils of the two enhanced windings are respectively and uniformly distributed around the two permanent magnet rotors. The outer sides of the upper permanent magnet rotor and the lower permanent magnet rotor are both provided with the reinforcing windings, and when the main shaft moves axially, the reinforcing windings provide extra magnetic pulling force for the main shaft, so that the main shaft is reset, and the axial deviation of the main shaft is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetic suspension device technical field especially a kind of magnetic suspension device, motor and pump of increasing magnetic suspension control ability. BACKGROUND

[0002] Traditional centrifugal pump usually uses mechanical bearing to support and position rotor, and this design is prone to problems such as bearing wear, lubricant failure, unreliable sealing and inability to meet ultra-clean requirements. In addition, traditional pumps have vibration and noise problems, and high operating costs. In order to overcome these shortcomings, magnetic suspension technology is widely used in the pump field.

[0003] Magnetic suspension technology suspends the impeller in the pump shell by using magnetic field, thereby achieving a contactless and wear-free operating state. Compared with traditional mechanical bearing centrifugal pumps, magnetic suspension pumps have higher efficiency, longer service life and lower maintenance cost.

[0004] Although magnetic suspension pumps have made significant progress, there are still some challenges in existing technology. In particular, the axial suspension of the sheet-type magnetic suspension motor is passively controlled, so the range of axial control force is small, and excessive axial load or severe fluctuations can cause suspension failure, which severely limits the capability range of the product in practical applications. SUMMARY

[0005] The utility model aims at solving above-mentioned problem, provides a kind of magnetic suspension device, motor and pump of increasing magnetic suspension control ability, solves above-mentioned technical problem.

[0006] A kind of magnetic suspension device of increasing magnetic suspension control ability, it include: reinforcing coil, permanent magnet rotor, main shaft and stator assembly, two permanent magnet rotors are coaxial and are arranged along up and down direction, two permanent magnet rotors are fixedly connected with main shaft respectively, the same number of magnetic poles of two permanent magnet rotors and the opposite direction of magnetic pole arrangement, two stator assemblies are located respectively outside two permanent magnet rotors, two stator assemblies are driven two permanent magnet rotors suspension and rotation by magnetic force respectively, the reinforcing winding includes multiple reinforcing coils, the reinforcing coil of two reinforcing windings is respectively arranged uniformly around two permanent magnet rotors.

[0007] Further, the stator assembly includes a first magnetic yoke and a coil set, the coil set is fixedly sleeved on the outside of the first magnetic yoke, the first magnetic yoke and the coil set are uniformly arranged around the permanent magnet rotor, and the reinforcing coil is fixedly connected with the first magnetic yoke.

[0008] Further, the first magnetic yoke comprises an axial arm and a first radial arm, the axial arm is fixedly connected with the first radial arm, the first radial arm protrudes inward and is located at the radial outer side of the permanent magnet rotor, the coil group is wound outside the axial arm, and the reinforcing coil corresponds to the first radial arm one by one, and the reinforcing coil is located on the upper side and / or the lower side of the corresponding first radial arm.

[0009] Further, the first magnetic yoke further comprises a second radial arm, the second radial arm is in contact with and fixedly connected with the axial arm, and the reinforcing coil is sleeved outside the second radial arm.

[0010] Further, the axis of the reinforcing coil is perpendicular to the axis of the coil group.

[0011] Further, the coil group comprises a suspension coil and a rotation coil, the rotation coil is used for driving the permanent magnet rotor to rotate, and the suspension coil and the rotation coil jointly drive the permanent magnet rotor to suspend.

[0012] Further, the adjacent first magnetic yokes are not connected through the magnetic conductive material, and the main shaft is made of non-magnetic conductive material.

[0013] Further, the two stator assemblies share the first magnetic yoke and the coil group.

[0014] A motor using the magnetic suspension device: further comprising a shell, the stator assembly is fixedly connected with the shell, and the permanent magnet rotor and the main shaft are not in contact with the shell.

[0015] A pump using the motor: further comprising a pump shell and an impeller, the pump shell is fixed with the shell and is inserted into the inside of the shell, the pump shell is respectively formed with an inlet and an outlet, the permanent magnet rotor and the main shaft are located in the inside of the pump shell, and the impeller is fixedly connected with the permanent magnet rotor and / or the main shaft.

[0016] The utility model has the advantages of:

[0017] 1. The upper and lower permanent magnet rotors are provided with reinforcing windings outside, when the main shaft moves in the axial direction, the reinforcing windings provide the main shaft with additional magnetic pulling force, so that the main shaft is reset, and the axial deviation of the main shaft is reduced.

[0018] 2. When the main shaft does not produce axial deviation, the upper and lower reinforcing windings can be selected to be electrified, because the magnetic field generated by the reinforcing coil and the rotation coil is the same, so the rotation driving force on the permanent magnet rotor is increased.

[0019] 3. When the main shaft does not produce axial deviation and the radial main control force is insufficient, the reinforcing windings can also adopt the same control strategy as the suspension coil to generate the same magnetic field as the suspension coil, so that the radial control force on the permanent magnet rotor is enhanced.

[0020] 4. The first magnetic yoke comprises axial arms and two first radial arms, the two first radial arms correspond to one permanent magnet rotor respectively, the magnetic flux path is changed, the electromagnetic force is improved, thereby greater power and torque are provided under the condition that the motor size is same, and the flow and lift of the pump are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only an embodiment of the present application, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0022] Figure 1 : schematic diagram of magnetic pole change of rotating magnetic field;

[0023] Figure 2 : schematic diagram of magnetic pole change of suspension magnetic field;

[0024] Figure 3 : front view of magnetic suspension device;

[0025] Figure 4 : front view of magnetic suspension device;

[0026] Figure 5 : perspective view of magnetic suspension device.

[0027] Figure 6 : front view of magnetic suspension pump;

[0028] Figure 7 : schematic diagram of sectional structure at A-A in Figure 6

[0029] Figure 8 : perspective view of magnetic suspension pump. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the drawings and examples:

[0031] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0032] ​In the description of the utility model, it needs to be explained that, unless there is definite stipulation and limitation, the terms "mount", "connect", "connect" should be understood in broad sense, for example, it can be fixed connection, also can be detachable connection, or integrally connected, it can be direct connection, also can be indirectly connected through intermediate medium.

[0033] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation of the utility model.

[0034] Embodiment one:

[0035] As Figures 1 to 8 The magnetic suspension device for increasing magnetic suspension control capacity includes: enhancement coil 4, permanent magnet rotor 5, main shaft 6 and stator assembly, two permanent magnet rotors 5 are coaxial and are arranged in the up-down direction, two permanent magnet rotors 5 are fixedly connected with the main shaft 6 respectively, the magnetic pole quantity of two permanent magnet rotors 5 is same and the magnetic pole arrangement direction is opposite, two stator assemblies are respectively located at the outer side of two permanent magnet rotors 5, two stator assemblies respectively drive two permanent magnet rotors 5 to suspend and rotate through magnetic force, the enhancement winding includes a plurality of enhancement coils 4, the enhancement coil 4 of two enhancement windings is respectively arranged uniformly around two permanent magnet rotors 5 in the circumferential direction.

[0036] As Figures 1 to 3 And Figure 7 As shown in the drawing, each stator assembly includes 8 first magnetic yokes 1 and 8 coil groups, and the first magnetic yoke 1 and coil group of two stator assemblies are shared, each permanent magnet rotor 5 has 2 magnetic poles as an example, the suspension rotation principle of the embodiment is explained, it needs to be explained that, the embodiment can actually satisfy the magnetic suspension device of different magnetic pole quantity permanent magnet rotor 5 and different number of coil group collocation.

[0037] For rotation, similar to permanent magnet synchronous motor, generally need stator excitation with the same number of permanent magnet rotor 5 rotation magnetic field. Since the embodiment is two axial linear arrangement of permanent magnet rotor 5, and the coaxial permanent magnet rotor 5 is not through the magnetic material communication, the first magnetic yoke 1 is C type and adjacent two first magnetic yoke 1 is not through the magnetic material communication, so as to make the rotating magnetic field can be achieved, need to make the double layer permanent magnet rotor 5 magnetic pole position dislocation, namely permanent magnet rotor 5 for pole pair number is 1, the performance of double layer permanent magnet rotor 5 is the same magnetic pole offset 180°.

[0038] It should be noted that when the permanent magnet rotor 5 is M magnetic pole pair, the same magnetic pole of the permanent magnet rotor 5 is offset 180° / M.

[0039] Now let two adjacent first magnetic yoke 1 of the rotating coil 3 group into the same current, at a moment, N pole magnetic field is generated, then the radial symmetry of two first magnetic yoke 1 of the rotating coil 3 group should pass through the opposite same current, so as to produce S pole magnetic field at the same time, at this time, a pair of magnetic field required for rotation is formed, through the phase change of current, the pair of magnetic field is rotated, so as to drive the permanent magnet rotor 5 to rotate, the position change of rotating magnetic field and permanent magnet rotor 5 is shown in Figure 1

[0040] wherein, Figure 1 the upper and lower layers in Figure 1 the "upper layer" refers to the magnetic field of the upper layer stator assembly and the upper layer permanent magnet rotor 5, the "lower layer" refers to the magnetic field of the lower layer stator assembly and the lower layer permanent magnet rotor 5, the angle below refers to the angle of permanent magnet rotor 5 rotation, the magnetic field in the circle is the magnetic field of permanent magnet rotor 5, and the magnetic field outside the circle is the rotating magnetic field of the corresponding first radial arm 11.

[0041] the main magnetic circuit 14 in the radial symmetry of the first magnetic yoke 1 is shown in Figure 3 two stator assemblies together constitute a magnetic circuit. For the radial active suspension of permanent magnet rotor 5, 2 pairs of magnetic poles are needed to be generated by the energization control of the suspension coil 2 of the stator, which is the prior art in the field of magnetic suspension motor. The number of magnetic pole pairs for suspension is equal to the number of rotating magnetic pole pairs ± 1 pair. For the offset correction of permanent magnet rotor 5, it is realized by the resultant magnetic field of the superposition of the suspension magnetic field on the rotating magnetic field. Among them, Figure 3 the magnetic pole of the permanent magnet rotor 5 above in

[0042] the suspension magnetic field change of double layer permanent magnet rotor 5 can be understood by Figure 2 It is understood that in addition to the radial 2 degrees of freedom for active suspension and axial rotation, the remaining degrees of freedom are passive suspension. Since the specific stator needs to work when the double layer permanent magnet rotor 5 participates at the same time, the main magnetic circuit 14 can be formed, so whether the two permanent magnet rotors 5 are active or passive suspension, the size of the correction force they receive will be the same.​

[0043] wherein, Figure 2 the upper layer and the lower layer in the above are the top view, Figure 2 the "upper layer" in the above refers to the magnetic field of the upper layer stator assembly and the upper layer permanent magnet rotor 5, the "lower layer" refers to the magnetic field of the lower layer stator assembly and the lower layer permanent magnet rotor 5, the angle below refers to the angle of rotation of the permanent magnet rotor 5, the magnetic field inside the circle is the magnetic field of the permanent magnet rotor 5, and the magnetic field outside the circle is the suspension magnetic field of the corresponding stator assembly.

[0044] Since the two-layer permanent magnet rotor 5 is coaxially and spaced apart at both ends of the main shaft, compared with the prior art magnetic suspension sheet motor with only one permanent magnet rotor 5, the structure can better suspend and rotate a relatively long shaft and output greater power.

[0045] Further, the stator assembly comprises a first magnetic yoke 1 and a coil group, the coil group is sleeved and fixed outside the first magnetic yoke 1, the first magnetic yoke 1 and the coil group are uniformly arranged in a circle around the permanent magnet rotor 5, and the reinforcing coil 4 is fixedly connected with the first magnetic yoke 1.

[0046] Further, the first magnetic yoke 1 comprises an axial arm 10 and a first radial arm 11, the end of the axial arm 10 is fixedly connected with the first radial arm 11, the first radial arm 11 protrudes inward and is located radially outside the permanent magnet rotor 5, the coil group is wound outside the axial arm 10, the reinforcing coil 4 corresponds to the first radial arm 11 one-to-one, and the reinforcing coil 4 is located on the upper side and / or the lower side of the corresponding first radial arm 11.

[0047] Further, the axis of the reinforcing coil 4 is perpendicular to the axis of the coil group, so that the reinforcing coil 4 provides an axial magnetic pull to the permanent magnet rotor 5.

[0048] Each coil group can comprise one or more coils:

[0049] Optionally, one coil group comprises one coil. At this time, one coil provides a rotating magnetic field and a suspension magnetic field for one permanent magnet rotor 5. The structure with only one coil is simpler, but the control system is required to be higher.

[0050] Optionally, the coil group comprises a suspension coil 2 and a rotating coil 3, the suspension coil 2 and the rotating coil 3 are sleeved outside the first magnetic yoke 1 respectively, the rotating coil 3 is used for driving the permanent magnet rotor 5 to rotate, and the suspension coil 2 and the rotating coil 3 jointly drive the permanent magnet rotor 5 to suspend. In this way, the number of coils used by each coil group is more, but the requirement of the control system is lower.

[0051] It should be noted that the driving of the permanent magnet rotor to suspend and rotate by the coil group is the prior art of the magnetic suspension bearingless motor.

[0052] Further, the adjacent first magnetic yokes 1 are not connected by magnetic conductive material, the adjacent magnetic yokes 1 refer to two circumferentially adjacent first magnetic yokes 1, avoiding the magnetic circuit passing through the adjacent first magnetic yokes 1, so that the magnetic circuit passes through the two first magnetic yokes 1 relatively symmetrically.

[0053] It should be noted that, as shown in Figure 3 , the two upper and lower enhancement windings are energized, at this time the enhancement winding plays a strong role in rotating driving force. As shown in Figure 3 , in the axial offset control, only one set of enhancement coils 4 in the upper and lower two sets of enhancement windings can have a magnetic circuit passing through, and the passing magnetic circuit needs to be closed in the first radial arm 11 of the first magnetic yoke 1 at the other end. Figure 4

[0054] Further, the main shaft 6 is made of non-magnetic conductive material, thereby avoiding the formation of an axial magnetic circuit between the two permanent magnet rotors 5 in the main shaft 6.

[0055] The stator assembly can share components or be two independent stator assemblies that do not share components:

[0056] Optionally, the two stator assemblies share the first magnetic yoke 1 and the coil set, the first magnetic yoke 1 includes an axial arm 10 and a first radial arm 11, the axial arm 10 is fixedly connected to the inwardly protruding first radial arm 11 at both ends, the two first radial arms 11 of the same first magnetic yoke 1 are located on the outer sides of the two permanent magnet rotors 5, and the coil set is sleeved on the outer side of the axial arm 10. The inward protrusion of the first radial arm 11 can make the air gap between the first radial arm 11 and the permanent magnet rotor 5 smaller, thereby reducing the magnetic leakage.

[0057] Optionally, the two stator assemblies respectively include a first magnetic yoke 1 and a coil set, the first magnetic yokes 1 of the two stator assemblies are in contact at the ends, so that the magnetic circuit can pass through the first magnetic yokes 1 of the two stator assemblies. The coil sets of the two stator assemblies are respectively sleeved on the outer sides of the first magnetic yokes 1 of the respective stator assemblies.

[0058] The positions of the two enhancement windings have the following modes:

[0059] Mode one: The enhancement coils 4 of the two enhancement windings are respectively located on the upper side of the corresponding first radial arm 11.

[0060] When the main shaft 6 is upwardly offset (i.e., the two permanent magnet rotors 5 are synchronously moved axially upwardly), the distance between the two permanent magnet rotors 5 and the corresponding enhancement windings decreases. If the enhancement windings are energized, the enhancement magnetic circuit 15 will pass through the permanent magnet rotor 5 and the enhancement winding, and the enhancement winding located above the permanent magnet rotor 5 will give the permanent magnet rotor 5 a magnetic upward pulling force, causing the permanent magnet rotor 5 to move upwardly, resulting in an increase in the axial offset of the main shaft 6. Therefore, at this time, the two enhancement windings are not energized, thereby avoiding increasing the axial offset of the main shaft 6.​

[0061] When the main shaft 6 is offset downward (i.e. the two permanent magnets 5 move synchronously downward in the axial direction), the distance between the two permanent magnets 5 and the corresponding reinforcing windings increases. If the reinforcing windings are energized, the reinforcing magnetic circuit 15 will pass through the permanent magnets 5 and the reinforcing windings, and the reinforcing windings above the permanent magnets 5 will give the permanent magnets 5 an upward magnetic pull, causing the permanent magnets 5 to move upward, so that the axial offset of the main shaft 6 decreases. Therefore, at this time, both of the reinforcing windings are energized to reduce the axial offset of the main shaft 6.

[0062] This mode is suitable for devices in which the main shaft 6 has a downward axial offset trend. Both of the reinforcing windings can exert an axial force on the corresponding permanent magnet 5, and the ability to correct the downward offset of the main shaft 6 is stronger. However, when the main shaft 6 is offset upward, energizing the reinforcing windings will increase the offset, so this mode is not suitable for devices in which the main shaft 6 has an upward offset trend.

[0063] Mode two: The reinforcing coils 4 of the two reinforcing windings are respectively located on the lower side of the corresponding first radial arm 11.

[0064] When the main shaft 6 is offset upward (i.e. the two permanent magnets 5 move synchronously downward in the axial direction), the distance between the two permanent magnets 5 and the corresponding reinforcing windings increases. If the reinforcing windings are energized, the reinforcing magnetic circuit 15 will pass through the permanent magnets 5 and the reinforcing windings, and the reinforcing windings below the permanent magnets 5 will give the permanent magnets 5 a downward magnetic pull, causing the permanent magnets 5 to move downward, so that the axial offset of the main shaft 6 decreases. Therefore, at this time, both of the reinforcing windings are energized to reduce the axial offset of the main shaft 6.

[0065] Conversely, when the main shaft 6 is offset downward, if the reinforcing windings are energized, the reinforcing windings will also give the permanent magnets 5 a downward magnetic pull, causing the permanent magnets 5 to move downward, so that the axial offset of the main shaft 6 increases. Therefore, at this time, both of the reinforcing windings are not energized.

[0066] This mode is suitable for devices in which the main shaft 6 has an upward axial offset trend. Both of the reinforcing windings can exert a downward axial force on the corresponding permanent magnet 5, and the ability to correct the upward offset of the main shaft 6 is stronger. Conversely, when the main shaft 6 is offset downward, energizing the reinforcing windings will increase the offset, so this mode is not suitable for devices in which the main shaft 6 has a downward offset trend.

[0067] Mode three: The reinforcing coils 4 of the two reinforcing windings are oppositely arranged (i.e. the upper reinforcing coil 4 is located on the lower side of the upper first radial arm 11, and the lower reinforcing coil 4 is located on the upper side of the upper first radial arm 11), as shown in FIG. 4. Figure 3

[0068] ​When the main shaft 6 is upwardly deviated, the upper enhancement winding is energized at this time, giving the upper permanent magnet rotor 5 a downward magnetic pull. At this time, the lower enhancement winding is not energized, because the magnetic field generated by the lower enhancement winding after energization will give the lower permanent magnet rotor 5 an upward magnetic pull, and will instead strengthen the deviation.

[0069] Conversely, when the main shaft 6 is downwardly deviated, the upper enhancement winding is not energized, and the lower enhancement winding is energized, giving the lower permanent magnet rotor 5 an upward magnetic pull, driving the main shaft 6 to move upward, and reducing the axial deviation.

[0070] The two enhancement windings of the present mode are located between the two first radial arms 11, so as not to increase the axial length, and are beneficial to reducing the space of the device.

[0071] It should be noted that in all the above modes, the enhancement magnetic circuit 15 generated by the enhancement coil 4 is in the same direction as the main magnetic circuit 14 when the enhancement winding is energized. It should be noted that in the above mode, the magnetic field mainly passes through the first radial arm 11 and does not pass through the enhancement coil 4.

[0072] When the main shaft 6 does not produce axial deviation, the upper and lower enhancement windings can be selected to be energized, because the magnetic field generated by the enhancement coil 4 and the rotating coil 3 is the same, which will increase the rotating driving force of the permanent magnet rotor 5; if the main shaft 6 does not have axial deviation and the radial main control force is insufficient, the enhancement winding can also adopt the same control strategy as the suspension coil 2, and generate the same magnetic field as the suspension coil 2, thereby enhancing the radial control force; the enhancement coil 4 can also use the single winding principle of the magnetic suspension motor to pass through the superimposed current in it, and simultaneously generate the suspension and rotating magnetic field, and simultaneously enhance the rotating and radial suspension driving force.

[0073] Further, the first magnetic yoke 1 further comprises a second radial arm 12, which is in contact with and fixedly connected to the axial arm 10, and the enhancement coil 4 is sleeved outside the second radial arm 12.

[0074] Preferably, the second radial arm 12 is integrally formed with the axial arm 10.

[0075] Since the enhancement coil 4 mainly utilizes the leakage magnetic field of the permanent magnet rotor 5, and the increased second radial arm 12 has better magnetic conductivity than the original hollow air, the utilization rate of the leakage magnetic field will be higher.

[0076] It should be noted that when the second radial arm 12 is not increased, and the enhancement coil 4 is not energized, the original axial suspension of the main shaft 6 mainly relies on the passive suspension of the magnetic resistance of the permanent magnet rotor 5. Taking the case that the main shaft 6 is upwardly deviated, at this time, the original upper first radial arm 11 and lower first radial arm 11 will generate the same size magnetic resistance due to the increase of the air gap caused by the deviation of the permanent magnet rotor 5, because the increase of the air gap is the same in size.

[0077] Method one increases the second radial arm 12:

[0078] When the main shaft 6 is upwardly offset, the distance between the two permanent magnet rotors 5 and the corresponding first radial arm 11 increases, and the distance between the two permanent magnet rotors 5 and the corresponding second radial arm 12 decreases. In order to inhibit the magnetic force lines of the permanent magnet rotor 5 from passing through the corresponding second radial arm 12, the two enhancement windings 4 of the enhancement winding at this time need to generate an opposite magnetic field (i.e. the magnetic path direction is opposite to the rotating coil 3), reducing the magnetic pull in the axial direction upward.

[0079] Conversely, when the main shaft 6 is downwardly offset, the distance between the two permanent magnet rotors 5 and the corresponding first radial arm 11 and the second radial arm 12 both increase. At this time, the two enhancement windings 4 of the enhancement winding need to generate the same magnetic field as the rotating coil 3, enhancing the magnetic pull of the permanent magnet rotor 5 upward, and this method has a better effect on inhibiting the offset of the main shaft 6 with a downward offset trend.

[0080] Method two increases the second radial arm 12:

[0081] When the main shaft 6 is upwardly offset, the distance between the two permanent magnet rotors 5 and the corresponding first radial arm 11 and the second radial arm 12 both increase. At this time, the two enhancement windings 4 of the enhancement winding need to generate the same magnetic field as the rotating coil 3, enhancing the magnetic pull of the permanent magnet rotor 5, and this method has a better effect on inhibiting the offset of the main shaft 6 with an upward offset trend.

[0082] Conversely, when the main shaft 6 is downwardly offset, the distance between the two permanent magnet rotors 5 and the corresponding first radial arm 11 increases, and the distance between the two permanent magnet rotors 5 and the corresponding second radial arm 12 decreases. In order to inhibit the magnetic force lines of the permanent magnet rotor 5 from passing through the corresponding second radial arm 12, the two enhancement windings 4 of the enhancement winding at this time need to generate an opposite magnetic field (i.e. the magnetic path direction is opposite to the rotating coil 3), reducing the magnetic pull in the axial direction downward.

[0083] Method three increases the second radial arm 12:

[0084] As shown in Figure 4 The second radial arm 12 is added between the original two first radial arms 11, and the distance between the upper permanent magnet rotor 5 and the first radial arm 11 and the second radial arm 12 at the upper end both increases. The second radial arm 12 at the upper end generates a magnetic pull due to the energization of the enhancement winding 4, and the first radial arm 11 generates a magnetic resistance, which together drive the upper permanent magnet rotor 5 to move downward to reset.

[0085] However, the magnetic resistance force of the lower permanent magnet rotor 5 will be different from that when there is no second radial arm 12, because the upward displacement of the main shaft 6 makes the lower permanent magnet rotor 5 far away from the lower first radial arm 11 but close to the lower second radial arm 12. Therefore, the magnetic resistance force of the lower permanent magnet rotor 5 does not increase relatively, and the axial passive suspension effect of the lower end of the main shaft 6 will be weakened. This is because the magnetic circuit passing through the lower permanent magnet rotor 5 will pass through the second radial arm 12 more and the first radial arm 11 less, and the magnetic resistance force of the first radial arm 11 to the permanent magnet rotor 5 is smaller.

[0086] Therefore, the control mode of the reinforcing coil 4 is different from the above structure. When the main shaft 6 is displaced upward, the control mode of the upper end reinforcing coil 4 remains unchanged (i.e. the magnetic circuit direction is the same as that of the rotating coil 3), but the control mode of the lower end reinforcing coil 4 is opposite (i.e. the magnetic circuit direction is opposite to that of the rotating coil 3), mainly to inhibit the magnetic force line of the lower end permanent magnet rotor 5 from closing through the second radial arm 12 to weaken the original axial passive suspension force.

[0087] It should be noted that the permanent magnet rotor 5 is subjected to magnetic pull force under the active control of the energized reinforcing coil 4, and the part without the active control of the energized reinforcing coil 4 (such as the first radial arm 11) is subjected to magnetic resistance force to the permanent magnet rotor 5.

[0088] Further, an axial sensor is used to detect the axial position of the main shaft 6, and a controller is used to change the on-off of the current in the reinforcing coil 4. The position of the main shaft 6 is detected by the axial sensor, and the detected position information is transmitted to the controller, and the controller determines whether the reinforcing coil 4 needs to be energized.

[0089] Embodiment two:

[0090] As shown in Figures 1 to 8 , a motor using the magnetic suspension device of embodiment one: further comprising a housing 7, the stator assembly is fixedly connected with the housing 7, and the permanent magnet rotor 5 and the main shaft 6 do not contact the housing 7.

[0091] Since the two permanent magnet rotors 5 are coaxially and spaced apart at the two ends of the main shaft, compared with the prior art magnetic suspension sheet motor with only one permanent magnet rotor, this structure can better suspend a relatively long shaft.

[0092] Embodiment three:

[0093] As shown in Figures 1 to 8 , a pump using the motor of embodiment two: further comprising a pump housing 8 and an impeller 83, the pump housing 8 is fixed with the housing 7 and inserted into the inner cavity 70 of the housing 7, the pump housing 8 is respectively formed with an inlet 81 and an outlet 82, the permanent magnet rotor 5 and the main shaft 6 are located inside the pump housing 8, and the impeller 83 is fixedly connected with the permanent magnet rotor 5 and / or the main shaft 6.

[0094] One end of the main shaft 5 is fixedly provided with an impeller 73. The magnetic suspension motor is matched with a pump head to realize the work of pumping liquid medium. The magnetic force of the permanent magnet rotor 5 is larger than that of the magnetic suspension thin slice motor with a single same diameter shaft and a thickness equal to the sum of two permanent magnet rotors 5 in the prior art. Therefore, the output power and torque of the embodiment are higher, and the demand for large flow or high lift can be better met.

[0095] Since the impeller 73 has an upward deviation tendency when rotating in the liquid, the position of the enhancement winding can adopt mode two to enhance the downward magnetic pull force, so as to achieve a better correction effect.

[0096] In some cases, a smaller volume motor and pump are required. At this time, the position of the enhancement winding can adopt mode three, and the increased enhancement coil 4 is located between the two first radial arms 11, without increasing the volume of the motor and pump.

[0097] The utility model is described above by way of example, but the utility model is not limited to the above specific embodiments, and any modification or change based on the utility model belongs to the scope of protection required by the utility model.

Claims

1. A magnetic levitation device for increasing magnetic levitation control capability, characterized by comprising: The application relates to a magnetic suspension device with enhanced control capability. The magnetic suspension device comprises: enhanced windings, permanent magnet rotors (5), a main shaft (6) and stator assemblies, the two permanent magnet rotors (5) are coaxial and arranged in the up-down direction, the two permanent magnet rotors (5) are fixedly connected with the main shaft (6), the two permanent magnet rotors (5) have the same number of magnetic poles and the magnetic poles are arranged in opposite directions, the two stator assemblies are respectively located outside the two permanent magnet rotors (5), the two stator assemblies respectively drive the two permanent magnet rotors (5) to suspend and rotate through magnetic force, and the enhanced windings comprise a plurality of enhanced coils (4). The enhanced coils (4) of the two enhanced windings are respectively uniformly arranged in a circumferential direction around the two permanent magnet rotors (5).

2. The magnetic levitation device of claim 1, wherein: The stator assembly comprises a first magnetic yoke (1) and a coil group, the coil group is fixedly sleeved outside the first magnetic yoke (1), the first magnetic yoke (1) and the coil group are uniformly arranged in a circumferential direction around the permanent magnet rotor (5), and the enhanced coil (4) is fixedly connected with the first magnetic yoke (1).

3. The magnetic levitation device of claim 2, wherein: The first magnetic yoke (1) comprises an axial arm (10) and a first radial arm (11), the end of the axial arm (10) is fixedly connected with the first radial arm (11), the first radial arm (11) protrudes inward and is located outside the permanent magnet rotor (5) in a radial direction, the coil group is wound outside the axial arm (10), the enhanced coil (4) corresponds to the first radial arm (11) one by one, and the enhanced coil (4) is located on the upper side and / or the lower side of the corresponding first radial arm (11).

4. The magnetic levitation device of claim 3, wherein: The first magnetic yoke (1) further comprises a second radial arm (12), the second radial arm (12) is in contact with and fixedly connected with the axial arm (10), and the enhanced coil (4) is sleeved outside the second radial arm (12).

5. The magnetic levitation device of claim 2, wherein: The axis of the enhanced coil (4) is perpendicular to the axis of the coil group. The magnetic suspension device further comprises an axial sensor and a controller, the axial sensor is used for detecting the axial position of the main shaft (6), and the controller is used for changing the on-off of the current in the enhanced coil (4).

6. The magnetic levitation device of claim 2, wherein: The coil group comprises suspension coils (2) and rotating coils (3), the rotating coils (3) are used for driving the permanent magnet rotor (5) to rotate, and the suspension coils (2) and the rotating coils (3) jointly drive the permanent magnet rotor (5) to suspend.

7. The magnetic levitation device of claim 2, wherein: The first magnetic yokes (1) are not connected through a magnetic conductive material, and the main shaft (6) is made of a non-magnetic conductive material.

8. The magnetic levitation device of claim 2, wherein: The two stator assemblies share the first magnetic yoke (1) and the coil group.

9. An electric machine characterized by: The magnetic suspension device with enhanced control capability is used, and a shell (7) is further arranged, the stator assembly is fixedly connected with the shell (7), and the permanent magnet rotor (5) and the main shaft (6) are not in contact with the shell (7).

10. A pump characterized by: The motor is used, and a pump shell (8) and an impeller (83) are further arranged, the pump shell (8) is fixedly connected with the shell (7) and is inserted into the shell (7), the pump shell (8) is respectively provided with an inlet (81) and an outlet (82), the permanent magnet rotor (5) and the main shaft (6) are located in the pump shell (8), and the impeller (83) is fixedly connected with the permanent magnet rotor (5) and / or the main shaft (6).

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