Birotor magnetic suspension motor and magnetic suspension pump

Abstract

The utility model relates to a birotor maglev motor and maglev pump, including: magnet yoke, permanent magnet rotor, main shaft and coil group, two permanent magnet rotor are coaxial and are arranged along the axial direction, two permanent magnet rotor have the same magnetic pole number and magnetic pole arrangement direction opposite, two permanent magnet rotor are respectively and fixedly connected with main shaft, the coil group is connected with the coil group. The plurality of magnet yokes are circumferentially arranged around the permanent magnet rotor, radial arms protruding inwards are respectively formed at two ends of the magnet yokes, the radial arms are positioned on the radial outer side of the permanent magnet rotor, and the coil assembly is wound on the outer sides of the magnet yokes. The magnetic yoke comprises the axial arm and the two radial arms, the two radial arms respectively correspond to one permanent magnet rotor, the magnetic flux path is changed, the electromagnetic force is improved, and therefore under the condition that the sizes of motors are the same, larger power and torque are provided, and the flow and lift of a pump are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of magnetic suspension pump bearingless motor, especially a double-rotor magnetic suspension motor and magnetic suspension pump. BACKGROUND

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

[0003] Magnetic suspension technology suspends the impeller in the pump casing using a 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 costs.

[0004] Despite the significant progress made in magnetic suspension pumps, there are still some challenges in existing technology. In particular, thin-plate magnetic suspension motors have a bottleneck in driving magnetic suspension pumps for large flow delivery, such as low torque and poor stability during rotation. SUMMARY

[0005] The utility model aims at solving above-mentioned problem, provides a double-rotor magnetic suspension motor and magnetic suspension pump, solves above-mentioned technical problem.

[0006] A double-rotor magnetic suspension motor, comprising: a magnetic yoke, a permanent magnet rotor, a main shaft, and a coil set, two permanent magnet rotors are coaxial and arranged in the axial direction, the number of magnetic poles of the two permanent magnet rotors is the same and the arrangement direction of the magnetic poles is opposite, the two permanent magnet rotors are fixedly connected with the main shaft respectively, a plurality of magnetic yokes are circumferentially arranged around the permanent magnet rotor, the magnetic yoke has a radially outwardly protruding radial arm formed at each end, the radial arm is located radially outward of the permanent magnet rotor, and the coil set is wound outside the magnetic yoke.

[0007] Further, the magnetic yoke includes an axial arm and a radial arm, the axial arm is fixedly connected with the radial arm at each end, and the coil set is wound outside the axial arm.

[0008] Further, the coil set includes a suspension coil and a rotation coil, the suspension coil and the rotation coil are respectively sleeved outside the magnetic yoke, the rotation coil is used to drive the permanent magnet rotor to rotate, and the suspension coil and the rotation coil jointly drive the permanent magnet rotor to suspend.

[0009] Further, the adjacent magnetic yokes are not connected by a magnetic conductive material.

[0010] Further, the main shaft is made of a non-magnetic conductive material.

[0011] Further, a shell is further included, the magnetic yoke is fixedly connected with the shell, and the permanent magnet rotor and the main shaft are not in contact with the shell.

[0012] Further, the number of magnetic pole pairs of each permanent magnet rotor is 1.

[0013] A magnetic suspension pump using the double-rotor magnetic suspension motor, further comprising a pump shell and an impeller, the pump shell is fixed with the shell, the pump shell is respectively formed with an inlet and an outlet, the permanent magnet rotor and the main shaft are located inside the pump shell, and the impeller is fixedly connected with the permanent magnet rotor and / or the main shaft.

[0014] Further, the pump shell comprises an end cover, a pump body and a cylinder body, the pump body is fixedly and detachably connected with the shell, one end of the pump body away from the shell is fixedly and detachably connected with the end cover, and the other end of the pump body close to the shell is fixedly connected with the cylinder body, the shell is internally formed with a central passage, the cylinder body is inserted into the central passage, and the permanent magnet rotor and the main shaft are located inside the cylinder body.

[0015] The utility model has the advantages that the magnetic yoke comprises axial arms and two radial arms, the two radial arms correspond to one permanent magnet rotor respectively, the magnetic flux path is changed, the electromagnetic force is improved, and thus greater power and torque are provided under the condition that the motor size is the same, and the flow and lift of the pump are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only one embodiment of the utility model, and for those skilled in the art, other embodiment drawings can be obtained according to the provided drawings without creating labor.

[0017] Figure 1 : the sectional view of magnetic suspension motor;

[0018] Figure 2 : the schematic diagram of magnetic pole change of rotating magnetic field;

[0019] Figure 3 : the schematic diagram of magnetic pole change of suspension magnetic field;

[0020] Figure 4 : the schematic diagram of the three-dimensional structure of magnetic suspension motor after removing shell;

[0021] Figure 5 : the schematic diagram of the three-dimensional structure of magnetic suspension pump;

[0022] Figure 6 : the schematic diagram of the sectional structure of magnetic suspension pump;

[0023] Figure 7 : In Figure 6 : cross-sectional structure schematic diagram at A-A in DETAILED DESCRIPTION

[0024] The utility model will be further described below in combination with the drawings and examples:

[0025] The embodiments of the utility model will be described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model and cannot be understood as a limitation of the utility model.

[0026] In the description of the utility model, it should be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be directly connected, or indirectly connected through intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0027] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the utility model.

[0028] As Figures 1 to 7 shown, a double-rotor magnetic suspension motor, comprising: magnetic yoke 1, permanent magnet rotor 4, main shaft 5 and coil group, two permanent magnet rotors 4 are coaxial and arranged in the axial direction, the number of magnetic poles of two permanent magnet rotors 4 is same and the arrangement direction of magnetic poles is opposite, two permanent magnet rotors 4 are fixedly connected with main shaft 5 respectively, a plurality of magnetic yokes 1 are circumferentially arranged around permanent magnet rotor 4, the both ends of magnetic yoke 1 are formed with radially outwardly protruding radial arms 12 respectively, the radial arms 12 are located radially outside permanent magnet rotor 4, and the coil group is wound outside magnetic yoke 1.

[0029] Further, the magnetic yoke 1 includes axial arms 11 and radial arms 12, the both ends of the axial arms 11 are fixedly connected with the radial arms 12 respectively, and the coil group is wound outside the axial arms 11. The radial arms 12 protrude inwardly, which can make the air gap between the magnetic yoke 1 and the permanent magnet rotor 4 smaller, thereby reducing the magnetic leakage.

[0030] The coil group of each magnetic yoke 1 can include one or more coils:

[0031] Alternatively, a coil group may consist of a single coil. In this case, a single coil provides both the rotating magnetic field and the levitation magnetic field to the permanent magnet rotor 4. While the structure using only a single coil is simpler, it places higher demands on the control system.

[0032] Optionally, a coil group includes two coils. The coil group includes a levitation coil 2 and a rotating coil 3, which are respectively mounted on the outside of the magnetic yoke 1. The rotating coil 3 drives the permanent magnet rotor 4 to rotate, and the levitation coil 2 and the rotating coil 3 together drive the permanent magnet rotor 4 to levitate. This method uses more coils but requires less sophisticated control systems.

[0033] Furthermore, adjacent magnetic yokes 1 are not connected by a magnetically conductive material; adjacent magnetic yokes 1 refer to two circumferentially adjacent magnetic yokes 1.

[0034] Furthermore, the main shaft 5 is made of a non-magnetic material to avoid the formation of an axial magnetic flux path between the two permanent magnet rotors 4 in the main shaft 5.

[0035] Furthermore, it also includes a housing 6, the magnetic yoke 1 is fixedly connected to the housing 6, and the permanent magnet rotor 4 and the main shaft 5 do not contact the housing 6, thereby avoiding mechanical friction.

[0036] Furthermore, each permanent magnet rotor 4 has 1 pole pair.

[0037] like Figures 1 to 4 As shown, taking an example of 8 magnetic yokes 1 and coil groups, and each permanent magnet rotor 4 having 2 magnetic poles, the levitation rotation principle of this embodiment is explained. It should be noted that this embodiment can actually accommodate motors with various numbers of permanent magnet rotors 4 with different numbers of magnetic poles and different numbers of magnetic yokes 1.

[0038] For rotation, similar to permanent magnet synchronous motors, the stator typically needs to generate a rotating magnetic field with the same number of poles as the permanent magnet rotor 4. Since this embodiment consists of two axially arranged permanent magnet rotors 4, and the coaxial permanent magnet rotors 4 are not connected by a magnetic material, and the magnetic yoke 1 is C-shaped with adjacent magnetic yokes 1 not connected by a magnetic material, in order to realize the rotating magnetic field, the magnetic pole positions of the double-layer permanent magnet rotor 4 need to be misaligned. That is, when the permanent magnet rotor 4 has 1 pole pair, the same magnetic poles of the double-layer permanent magnet rotor 4 are offset by 180°.

[0039] It should be noted that when the permanent magnet rotor 4 has M pole pairs, the same poles of the permanent magnet rotor 4 are offset by 180° / M.

[0040] Now let two adjacent magnetic yoke 1 of the rotating coil 3 group into the same direction current, at a moment N pole magnetic field, then the radial symmetry of the two magnetic yoke 1 rotating coil 3 group should be opposite the same direction current, so that the same time S pole magnetic field, at this time form a pair of rotating required magnetic field, through the phase change of current, so that the pair of magnetic field to realize rotation, thus driving permanent magnet rotor 4 rotation, rotating magnetic field and permanent magnet rotor 4 position change as Figure 2 .

[0041] Among them, Figure 2 The upper and lower layers are both from the perspective of looking down, Figure 2 The "upper layer" in the "upper layer" refers to the magnetic field of the upper layer stator assembly and the upper layer permanent magnet rotor 4, and the "lower layer" refers to the magnetic field of the lower layer stator assembly and the lower layer permanent magnet rotor 4, and the angle below refers to the angle of rotation of the permanent magnet rotor 4, and the magnetic field inside the circle is the magnetic field of the permanent magnet rotor 4, and the magnetic field outside the circle is the rotating magnetic field of the corresponding radial arm 12.

[0042] The main magnetic circuit 13 in the radially symmetrical magnetic yoke 1 is shown in Figure 1 For the radial active suspension of the permanent magnet rotor 4, two pairs of magnetic poles are needed to be generated by controlling the current of the suspension coil 2 of the stator, which is a prior art in the field of magnetic suspension motors. The number of suspension magnetic poles is equal to the number of rotating magnetic poles ± 1, and the offset correction of the permanent magnet rotor 4 is realized by the resultant magnetic field of the superposition of the suspension magnetic field on the rotating magnetic field.

[0043] The suspension magnetic field change of the double-layer permanent magnet rotor 4 can be understood by Figure 3 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 magnetic yoke 1 and coil group need the participation of the double-layer permanent magnet rotor 4 at the same time to form the main magnetic circuit 13, the correction force received by the two permanent magnet rotors 4 whether active or passive suspension will be the same.

[0044] Among them, Figure 3 The upper and lower layers are both from the perspective of looking down, Figure 3 The "upper layer" in the "upper layer" refers to the magnetic field of the upper layer stator assembly and the upper layer permanent magnet rotor 4, and the "lower layer" refers to the magnetic field of the lower layer stator assembly and the lower layer permanent magnet rotor 4, and the angle below refers to the angle of rotation of the permanent magnet rotor 4, and the magnetic field inside the circle is the magnetic field of the permanent magnet rotor 4, and the magnetic field outside the circle is the suspension magnetic field of the corresponding stator assembly.

[0045] Since the two permanent magnet rotors 4 are coaxially and spaced apart at both ends of the main shaft, compared with the prior art of the magnetic suspension sheet motor with only one permanent magnet, the structure can better suspend and rotate the relatively long shaft.

[0046] As shown in Figures 1 to 7As shown, a magnetic suspension pump using the double-rotor magnetic suspension motor further comprises a pump shell 7 and an impeller 73, the pump shell 7 is fixed with the machine shell 6, the pump shell 7 is respectively formed with an inlet 71 and an outlet 72, the permanent magnet rotor 4 and the main shaft 5 are located inside the pump shell 7, and the impeller 73 is fixedly connected with the permanent magnet rotor 4 and / or the main shaft 5.

[0047] Further, the pump shell 7 comprises an end cover 74, a pump body 75 and a cylinder body 76, the pump body 75 is fixedly and detachably connected with the machine shell 6, one end of the pump body 75 away from the machine shell 6 is fixedly and detachably connected with the end cover 74, and the other end of the pump body 75 close to the machine shell 6 is fixedly connected with the cylinder body 76, the machine shell 6 is formed with a central passage 60 inside, the cylinder body 76 is inserted into the central passage 60, and the permanent magnet rotor 4 and the main shaft 5 are located inside the cylinder body 76.

[0048] One end of the main shaft 5 is fixedly provided with the impeller 73, the magnetic suspension motor is matched with the pump head to realize the work of pumping liquid medium, the magnetic force of the permanent magnet rotor 4 is larger than that of the magnetic suspension sheet motor with a single permanent magnet with the same diameter and thickness equal to the sum of the two permanent magnet rotors 4 in the prior art, so that the output power and torque of the embodiment are higher, and the demand for large flow or high lift can be better met.

[0049] Meanwhile, the embodiment does not increase the thickness (i.e. the axial length) compared with the magnetic suspension sheet motor in the prior art, that is, higher flow and lift are provided under the same volume.

[0050] The utility model has been 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 falls within the scope of the utility model claimed.

Claims

1. A dual-rotor magnetic levitation motor, characterized in that, include: The magnetic yoke (1), permanent magnet rotor (4), main shaft (5) and coil group are arranged coaxially and along the axial direction. The two permanent magnet rotors (4) have the same number of magnetic poles and opposite magnetic pole arrangement directions. The two permanent magnet rotors (4) are fixedly connected to the main shaft (5) respectively. Multiple magnetic yokes (1) are arranged in a circle around the permanent magnet rotor (4). The two ends of the magnetic yoke (1) are respectively formed with radial arms (12) protruding inward. The radial arms (12) are located on the radial outside of the permanent magnet rotor (4). The coil group is wound around the outside of the magnetic yoke (1).

2. The dual-rotor magnetic levitation motor according to claim 1, characterized in that: The magnetic yoke (1) includes an axial arm (11) and a radial arm (12). The two ends of the axial arm (11) are fixedly connected to the radial arm (12), and the coil group is wound around the outside of the axial arm (11).

3. A dual-rotor magnetic levitation motor according to claim 1, characterized in that: The coil group includes a levitation coil (2) and a rotating coil (3). The levitation coil (2) and the rotating coil (3) are respectively mounted on the outside of the magnetic yoke (1). The rotating coil (3) is used to drive the permanent magnet rotor (4) to rotate. The levitation coil (2) and the rotating coil (3) together drive the permanent magnet rotor (4) to levitate.

4. A dual-rotor magnetic levitation motor according to claim 1, characterized in that: Adjacent magnetic yokes (1) are not connected by magnetically conductive material.

5. A dual-rotor magnetic levitation motor according to claim 1, characterized in that: The spindle (5) is made of a non-magnetic material.

6. A dual-rotor magnetic levitation motor according to claim 1, characterized in that: It also includes a housing (6), the magnetic yoke (1) is fixedly connected to the housing (6), and the permanent magnet rotor (4) and the main shaft (5) do not contact the housing (6).

7. A dual-rotor magnetic levitation motor according to claim 1, characterized in that: Each permanent magnet rotor (4) has 1 pole pair.

8. A magnetic levitation pump using the dual-rotor magnetic levitation motor as described in claim 6, characterized in that: It also includes a pump casing (7) and an impeller (73), the pump casing (7) being fixed to the housing (6), the pump casing (7) having an inlet (71) and an outlet (72) respectively, the permanent magnet rotor (4) and the main shaft (5) being located inside the pump casing (7), and the impeller (73) being fixedly connected to the permanent magnet rotor (4) and / or the main shaft (5).

9. A magnetic levitation pump according to claim 8, characterized in that: The pump housing (7) includes an end cap (74), a pump body (75), and a cylinder (76). The pump body (75) is fixed and detachably connected to the housing (6). The end of the pump body (75) away from the housing (6) is fixed and detachably connected to the end cap (74). The end of the pump body (75) close to the housing (6) is fixedly connected to the cylinder (76). A central channel (60) is formed inside the housing (6). The cylinder (76) is inserted into the central channel (60). The permanent magnet rotor (4) and the main shaft (5) are located inside the cylinder (76).

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