Motor cooling system and motor

Abstract

The present invention relates to the technical field of surface-mounted permanent magnet motors, and more specifically to a motor cooling system and a motor. The motor cooling system comprises: a housing, a stator, a sheath, a magnet, and a rotating shaft, which are arranged in sequence from the outside to the inside. The magnet is formed by sequentially splicing a plurality of magnet segments. Both end faces of each magnet segment are provided with radial cooling grooves. Each two adjacent radial cooling grooves constitute a first radial cooling hole. A plurality of cooling passages are formed along the plurality of first radial cooling holes toward the housing. When the rotor needs to be cooled, a cooling medium is simply introduced into the cooling passage. At this time, the cooling medium enters the first radial cooling hole through the cooling passage, thereby cooling the magnet, thereby achieving sufficient cooling of the interior of the rotor. The segmented design of the magnet effectively reduces the turbine loss of the magnet, thereby effectively preventing the permanent magnet from overheating and ensuring the normal operation of the rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of surface-mounted permanent magnet motors, and in particular to a motor cooling system and a motor. Background Art

[0002] Compared with electromagnetic motors, permanent magnet motors have the advantages of small size, simple structure, reliable operation, low loss and high efficiency, so they are widely used, especially rare earth permanent magnet motors; however, for permanent magnet motors, when the rotor temperature rises too high, if the heat cannot be dissipated in time, it will cause irreversible demagnetization of the permanent magnet, making the motor rotor unusable. Summary of the Invention

[0003] The purpose of the present application is to provide a motor cooling system and a motor to solve the problem in the prior art that when the rotor temperature rises too high, if the heat cannot be dissipated in time, it will cause irreversible demagnetization of the permanent magnet.

[0004] (1) Technical solution

[0005] To achieve the above-mentioned objectives, the first aspect of the present invention provides a motor cooling system, comprising: a casing, a stator, a sleeve, a magnetic steel and a rotating shaft arranged in sequence from the outside to the inside, the magnetic steel being formed by splicing a plurality of magnetic steel segments in sequence, each of the two end faces of the magnetic steel segment being provided with radial cooling grooves, each adjacent two radial cooling grooves constituting a first radial cooling hole, and a plurality of cooling passages running through the plurality of first radial cooling holes in the direction of the casing.

[0006] Optionally, the cooling passage includes:

[0007] A cooling medium inlet is provided on the housing;

[0008] a second radial cooling hole, formed on the stator and connected to the cooling medium inlet;

[0009] The third radial cooling hole is formed on the sleeve and is respectively connected with the first radial cooling hole and the second radial cooling hole.

[0010] Optionally, the inner wall surface of the sleeve is further provided with a plurality of axial cooling grooves, and each of the axial cooling grooves intersects with the corresponding third radial cooling hole.

[0011] Optionally, the end surface of the rotating shaft is further provided with a first axial cooling hole connected to the axial cooling groove.

[0012] Optionally, a plurality of first circumferential cooling grooves are further provided on the outer wall surface of the matching section between the rotating shaft and the inner wall surface of the sleeve.

[0013] Optionally, the outer wall surface of the sleeve is provided with a second circumferential cooling groove connected to a plurality of the third radial cooling holes.

[0014] Optionally, the magnetic steel is configured as an annular magnetic steel, and a plurality of second axial cooling holes are provided on the rotating shaft along a direction close to an end portion, and the second axial cooling holes are connected to the first radial cooling holes.

[0015] Optionally, the second axial cooling holes are in contact with the magnetic poles on the annular magnetic steel, and the number of the second axial cooling holes matches the number of the magnetic poles.

[0016] Optionally, the casing is further provided with a water cooling channel for cooling the stator.

[0017] To achieve the above-mentioned object, a second aspect of the present invention provides a motor, comprising: a motor cooling system as described in any one of the above-mentioned items.

[0018] (2) Beneficial effects

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a motor cooling system and a motor, comprising: a casing, a stator, a sleeve, a magnetic steel and a rotating shaft arranged in sequence from the outside to the inside, the magnetic steel being formed by sequentially splicing a plurality of magnetic steel segments, radial cooling grooves being provided on both end faces of each magnetic steel segment, and every two adjacent radial cooling grooves forming a first radial cooling hole, and a plurality of cooling passages penetrating along the plurality of first radial cooling holes toward the casing; when the rotor needs to be cooled, a cooling medium only needs to be passed into the cooling passage, at which time the cooling medium will enter the first radial cooling hole via the cooling passage, thereby cooling the magnetic steel, and further achieving sufficient cooling of the interior of the rotor, and the segmented design of the magnetic steel will effectively reduce the turbine loss of the magnetic steel, thereby effectively avoiding excessive temperature of the permanent magnet and ensuring normal operation of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, a person skilled in the art can derive other drawings based on these drawings without inventive work, among which:

[0023] Figure 1 It is a structural schematic diagram of one embodiment of the motor cooling system of the present invention;

[0024] Figure 2 yes Figure 1 A partial enlarged view of position A in the middle;

[0025] Figure 3 It is a structural schematic diagram of one embodiment of the rotor in the present invention;

[0026] Figure 4 It is a structural schematic diagram of one embodiment of the magnetic steel segment in the present invention;

[0027] Figure 5 It is a structural schematic diagram of one embodiment of the rotating shaft of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the sheath in the present invention;

[0029] Figure 7 is a structural schematic diagram of another embodiment of the motor cooling system of the present invention;

[0030] Figure 8 It is a structural schematic diagram of another embodiment of the magnetic steel segment in the present invention;

[0031] Figure 9 It is a structural schematic diagram of another embodiment of the rotating shaft of the present invention.

[0032] In the figure: 1. Casing; 2. Stator; 3. Jacket; 4. Magnetic steel segment; 5. Rotating shaft; 6. Radial cooling groove; 7. First radial cooling hole; 8. Cooling medium inlet; 9. Second radial cooling hole; 10. Third radial cooling hole; 11. Axial cooling groove; 12. First axial cooling hole; 13. First circumferential cooling groove; 14. Second circumferential cooling groove; 15. Second axial cooling hole. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0035] like Figures 1-9 As shown, the first aspect of the present application provides a motor cooling system, comprising: a housing 1, a stator 2, a sheath 3, a magnetic steel and a rotating shaft 5 arranged in sequence from the outside to the inside, the magnetic steel being formed by splicing a plurality of magnetic steel segments 4 in sequence, as shown in FIG. Figure 2 and Figure 4 As shown, radial cooling grooves 6 are formed on both end surfaces of each magnetic steel segment 4. Every two adjacent radial cooling grooves 6 constitute a first radial cooling hole 7. The first radial cooling hole 7 is used to introduce the cooling medium into the interior of the rotor, thereby cooling the magnetic steel. Several cooling passages are passed through the first radial cooling holes 7 in the direction of the casing 1. In addition, the radial cooling grooves 6 can also play a positioning role in parallel magnetization, and the segmented design of the magnetic steel can also reduce rotor losses.

[0036] When the rotor needs to be cooled, it is only necessary to pass the cooling medium into the cooling passage. At this time, the cooling medium will enter the first radial cooling hole through the cooling passage, thereby cooling the magnetic steel, and then achieving sufficient cooling of the inside of the rotor. The segmented design of the magnetic steel will effectively reduce the turbine loss of the magnetic steel, thereby effectively avoiding the permanent magnet temperature from being too high and ensuring the normal operation of the rotor.

[0037] Specifically, the cooling path includes:

[0038] A cooling medium inlet 8 is provided on the housing 1;

[0039] The cooling medium circulation outlet can be opened on the casing or on the end cover according to actual needs.

[0040] The second radial cooling hole 9 is provided on the stator 2 and is connected to the cooling medium inlet 8;

[0041] The third radial cooling holes 10 are provided on the jacket 3 and are respectively connected with the first radial cooling holes 7 and the second radial cooling holes 9, and the outer wall of the jacket 3 is provided with second circumferential cooling grooves 14 connected with a plurality of the third radial cooling holes 10. In addition, in this embodiment, the design of slotting the jacket can further reduce the rotor loss. Preferably, the jacket is made of an alloy material or a fiber composite material.

[0042] When the rotor needs to be cooled, it is only necessary to pass the cooling medium into the cooling passage. At this time, the cooling medium will pass through the cooling medium inlet 8, the second radial cooling hole 9, the third radial cooling hole 10 in sequence, and finally enter the first radial cooling hole 7, thereby cooling the magnetic steel and further achieving sufficient cooling of the inside of the rotor. The segmented design of the magnetic steel will effectively reduce the turbine loss of the magnetic steel, thereby effectively avoiding excessive temperature of the permanent magnet and ensuring the normal operation of the rotor.

[0043] According to one embodiment of the present invention, in order to further cool the inside of the rotor, that is, to cool the shaft, as shown in FIG. Figure 6 As shown, the inner wall surface of the jacket 3 is further provided with a plurality of axial cooling grooves 11, each of which intersects with the corresponding third radial cooling hole 10; Figure 5 and Figure 9 As shown, the end surface of the rotating shaft 5 is also provided with a first axial cooling hole 12 connected to the axial cooling groove 11; Figure 1 As shown, during cooling, the cooling medium will enter the axial cooling groove 11 through the third radial cooling hole 10, and then the cooling medium will flow along the axial cooling groove 11 to the end of the shaft until it flows into the first axial cooling hole 12, thereby achieving sufficient cooling of the shaft. Figure 9 As shown, this embodiment is a solid magnetic steel surface-mounted motor, and the rotating shaft is set as two short shafts in the front and rear, and the two short shafts are set at both ends of the solid magnetic steel. In order to ensure sufficient cooling for the two short shafts, a first axial cooling hole 12 is opened on both short shafts.

[0044] According to one embodiment of the present invention, in order to further achieve sufficient cooling of the rotating shaft, as shown in FIG. Figure 5 and Figure 9 As shown, a plurality of first circumferential cooling grooves 13 are further provided on the outer wall surface of the mating section between the rotating shaft 5 and the inner wall surface of the sleeve 3. Specifically, the first circumferential cooling grooves 13 are connected with the axial cooling grooves 11. The cooling medium flowing out through the axial cooling grooves 11 will enter the first circumferential cooling grooves 13, thereby achieving further cooling of the rotating shaft.

[0045] According to one embodiment of the present invention, Figure 5 As shown, this embodiment is a ring-shaped magnetic steel surface-mounted motor, the magnetic steel is set as a ring-shaped magnetic steel, and a plurality of second axial cooling holes 15 are opened on the rotating shaft 5 along the direction close to the end, and the second axial cooling holes 15 are connected to the first radial cooling holes 7; preferably, the number of the second axial cooling holes 15 is adapted to the number of magnetic poles provided on the ring-shaped magnetic steel; in addition to draining the cooling medium introduced from the first radial cooling holes 7 to between the magnetic steel and the rotating shaft, the second axial cooling holes 15 also change the direction of the magnetic lines of force near the magnetic poles, thereby improving the anti-demagnetization ability of the rotating shaft itself.

[0046] According to one embodiment of the present invention, in order to cool the stator, the housing 1 is further provided with a water cooling channel for cooling the stator 2; the water cooling channel can be arranged on the housing in a circumferential or spiral manner.

[0047] A second aspect of the present application provides a motor, comprising: a motor cooling system as described in any one of the above items.

[0048] Each embodiment in this specification is described in a progressive manner. Some embodiments focus on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.

[0049] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying importance. The terms "bottom" and "top," as well as "inner" and "outer," refer to directions toward or away from a specific component, respectively.

[0050] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to connections between the internal parts of two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A motor cooling system, characterized in that: include: A casing (1), a stator (2), a sheath (3), a magnetic steel, and a rotating shaft (5) are sequentially arranged from the outside to the inside, wherein the magnetic steel is formed by sequentially splicing together a plurality of magnetic steel segments (4), and radial cooling grooves (6) are provided on both end faces of each magnetic steel segment (4), and each two adjacent radial cooling grooves (6) form a first radial cooling hole (7), and a plurality of cooling passages are passed through along the plurality of first radial cooling holes (7) in the direction toward the casing (1); The cooling passage comprises: A cooling medium inlet (8) is provided on the housing (1); a second radial cooling hole (9) formed on the stator (2) and connected to the cooling medium inlet (8); a third radial cooling hole (10) formed on the jacket (3) and respectively connected to the first radial cooling hole (7) and the second radial cooling hole (9); The inner wall surface of the jacket (3) is further provided with a plurality of axial cooling grooves (11), and each of the axial cooling grooves (11) intersects with the corresponding third radial cooling hole (10); The outer wall surface of the matching section between the rotating shaft (5) and the inner wall surface of the sleeve (3) is also provided with a plurality of first circumferential cooling grooves (13), and the first circumferential cooling grooves (13) are connected to the axial cooling grooves (11).

2. The motor cooling system according to claim 1, characterized in that: The end surface of the rotating shaft (5) is also provided with a first axial cooling hole (12) which is in communication with the axial cooling groove (11).

3. The motor cooling system according to claim 1, characterized in that: The outer wall surface of the jacket (3) is provided with a second circumferential cooling groove (14) which is in communication with a plurality of the third radial cooling holes (10).

4. The motor cooling system according to claim 1, characterized in that: The magnetic steel is configured as an annular magnetic steel, and a plurality of second axial cooling holes (15) are provided on the rotating shaft (5) in a direction close to the end portion, and the second axial cooling holes (15) are connected to the first radial cooling holes (7).

5. The motor cooling system according to claim 4, characterized in that: The second axial cooling holes (15) are in contact with the magnetic poles on the annular magnetic steel, and the number of the second axial cooling holes (15) is adapted to the number of the magnetic poles.

6. The motor cooling system according to claim 1, characterized in that: The casing (1) is also provided with a water cooling channel for cooling the stator (2).

7. A motor, characterized in that: include: The motor cooling system according to any one of claims 1 to 6.

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