Rotating electrical machine
By setting slits in the partition of the rotating motor and optimizing the supply flow path design, the problems of noise reduction and cooling function reduction caused by vibration were solved, achieving a balance between noise suppression and cooling effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD
- Filing Date
- 2021-03-04
- Publication Date
- 2026-06-23
AI Technical Summary
Existing rotary motors suffer from noise problems and reduced cooling performance due to stator vibration during rotor rotation, especially due to short circuits in the refrigerant flow path caused by the partition wall, which impairs the cooling function.
A slit is provided in the partition section. The slit extends axially and is narrower than the main flow path. The supply flow path is designed to form obtuse and acute angles with the outer edge of the inner peripheral wall to reduce vibration transmission and refrigerant inflow into the short-circuit flow path.
It effectively suppresses the noise transmitted from stator vibration to the outer peripheral wall of the housing, maintains the integrity of the cooling function, and avoids a reduction in cooling capacity.
Smart Images
Figure CN115244831B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a rotary electric motor. Background Technology
[0002] The rotary electric motor described in Patent Documents 1 and 2 includes a rotor, a stator disposed radially outward of the rotor, and a housing containing the stator. The stator has a cylindrical yoke and teeth extending radially inward from the yoke. The rotary electric motor generates a rotating magnetic field by passing current through a coil wound around the teeth, and rotates the rotor by the magnetic force generated by the rotating magnetic field.
[0003] A refrigerant flow path for cooling the stator and other components is formed within the housing. The housing, as a component forming the refrigerant flow path, has an inner peripheral wall that contacts the outer peripheral surface of the stator, an outer peripheral wall disposed radially outward of the inner peripheral wall, and a partition wall portion disposed radially between the inner and outer peripheral walls. The partition wall portion is located in a circumferential direction within the housing and connects the inner and outer peripheral walls. An inlet for the refrigerant flow path is formed near the partition wall portion, and an outlet for the refrigerant flow path is formed on the side opposite to the inlet, across the partition wall portion. The refrigerant flowing into the refrigerant flow path through the inlet flows approximately one revolution within the refrigerant flow path before flowing out through the outlet.
[0004] Previous technical documents
[0005] Patent documents
[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-46853
[0007] Patent Document 2: Japanese Patent Application Publication No. 2014-236613 Summary of the Invention
[0008] The technical problem to be solved by the invention
[0009] In the aforementioned rotary motor, when the rotor rotates, magnetic force acts intermittently between the rotor and the teeth, causing the stator to vibrate. If this vibration is transmitted from the stator to the inner peripheral wall, and then, for example, via a partition, from the inner peripheral wall to the outer peripheral wall, noise will be generated due to the vibration of the outer peripheral wall. As a noise countermeasure, one could consider not providing a partition to suppress the transmission of vibration from the inner peripheral wall to the outer peripheral wall. However, in this case, a short-circuit path is formed from the inlet to the outlet, raising concerns that a large portion of the refrigerant may easily flow into the short-circuit path. Therefore, the amount of refrigerant that originally flowed through the refrigerant flow path is significantly reduced, potentially leading to a substantial impairment of the cooling function.
[0010] The purpose of this invention is to suppress the reduction of cooling function and to suppress the transmission of stator vibration to the outer peripheral wall of the housing.
[0011] means for solving technical problems
[0012] The rotary electric motor of the first invention comprises: a rotor capable of rotating about a predetermined axial direction; a stator disposed radially outside the rotor; and a housing having a flow path portion forming a refrigerant flow path and housing the rotor and the stator. The rotary electric motor is characterized in that the flow path portion has: an inner peripheral wall in contact with the outer peripheral surface of the stator; an outer peripheral wall disposed radially outside the inner peripheral wall and configured to form the refrigerant flow path between the outer peripheral wall and the inner peripheral wall; and an inlet portion in a circumferential direction orthogonal to both the axial and radial directions. An inlet and an outlet of the refrigerant flow path are formed at a predetermined location. An outlet of the refrigerant flow path is formed at a different location in the circumferential direction. The refrigerant flow path includes: a first flow path with a predetermined circumferential length from the inlet to the outlet; and a second flow path with a shorter circumferential length from the inlet to the outlet than the first flow path. In the second flow path, a partition is provided radially between the inner and outer circumferential walls, and a slit extending circumferentially through the partition is formed in the partition, the width of which is narrower than the width of the first flow path.
[0013] In this invention, a circumferentially penetrating slit is formed in the partition wall portion, creating a gap between the outer and inner portions of the partition wall portion in the radial direction. This suppresses the transmission of stator vibrations accompanying rotor rotation from the inner to the outer peripheral wall. However, this slit creates a short-circuit path from the inlet to the outlet, resulting in increased refrigerant flow through the second flow path and decreased refrigerant flow through the first flow path, raising concerns about reduced cooling performance. In this respect, in this invention, the slit width is narrower than the width of the first flow path, thus significantly reducing the flow resistance of the second flow path and minimizing refrigerant inflow into the second flow path. Therefore, it is possible to suppress the reduction in cooling performance and suppress the transmission of stator vibrations to the outer peripheral wall of the housing.
[0014] The rotary motor of the second invention, in the first invention, is characterized in that the slit extends in the axial direction at least from one end of the outer peripheral surface of the stator to the other end.
[0015] In this invention, the slit extends axially from at least one end of the outer peripheral surface of the stator to the other end. That is, in any cross-section orthogonal to the axial direction, the portion of the inner peripheral wall adjacent to the stator and the outer peripheral wall are separated by the slit. Therefore, the transmission of stator vibration from the inner peripheral wall to the outer peripheral wall via the partition is effectively suppressed.
[0016] The rotary motor of the third invention, in the first or second invention, is characterized in that a supply flow path connected to the refrigerant flow path is formed at the inlet, and when viewed from the axial direction, in the tangent line at the intersection of the center line of the supply flow path and the outer edge of the inner peripheral wall, when the straight line extending from the intersection point to the first flow path side is designated as the first straight line, and the straight line extending from the intersection point to the second flow path side is designated as the second straight line, the angle between the center line and the first straight line is an obtuse angle, and the angle between the center line and the second straight line is an acute angle.
[0017] In this invention, the angle between the centerline and the first straight line is an obtuse angle, and the angle between the centerline and the second straight line is an acute angle. Therefore, when the refrigerant flowing into the refrigerant flow path through the supply flow path collides with the outer edge of the inner peripheral wall, it tends to flow towards the first flow path side, and its flow towards the second flow path side is suppressed. Thus, the reduction in cooling function can be further effectively suppressed. Attached Figure Description
[0018] Figure 1 This is a top view of the rotary electric motor involved in this embodiment.
[0019] Figure 2 (a) is along Figure 1 A sectional view cut along line II(a)-II(a). Figure 2 (b) is Figure 1 View II(b)
[0020] Figure 3 It is a cross-sectional view of a rotating electric machine orthogonal to the axial direction.
[0021] Figure 4 This is a top view of the rotating electric machine involved in the variation example.
[0022] Figure 5 This is a top view of a rotating electric machine involved in another variation.
[0023] Figure 6 (a) Figure 6 (b) is an explanatory diagram showing the structure near the inlet of the refrigerant flow path.
[0024] Figure 7 This is a cross-sectional view orthogonal to the axial direction of a rotating electric machine involved in another variation.
[0025] Figure 8 This is a top view of the rotary electric machine involved in the reference example.
[0026] Figure 9 This is a cross-sectional view of the rotating electric machine involved in the reference example, orthogonal to the axial direction. Detailed Implementation
[0027] Next, embodiments of the present invention will be described. Furthermore, [the following will be discussed]. Figure 1 The vertical direction of the paper ( Figure 2 (a) Figure 2 (b) The vertical direction on the paper is set as the axis. Figure 2 (a) Figure 2 (b) The upper side of the paper surface is set as the axial side. Figure 2 (a) Figure 2 (b) The lower side of the paper is designated as the other side in the axial direction. Hereinafter, the direction orthogonal to the axial direction, i.e., the radial direction of rotor 11 (described later), will be simply referred to as the radial direction. The direction orthogonal to both the axial and radial directions will be referred to as the circumferential direction.
[0028] (Rotary motor)
[0029] First, refer to Figures 1-3 The structure of the rotary motor 1 according to this embodiment will be described. Figure 1 This is a top view of rotary motor 1. Figure 2 (a) is along Figure 1 A sectional view cut along line II(a)-II(a). Figure 2 (b) is Figure 1 View II(b) Figure 3 This is a cross-sectional view of the rotary motor 1, orthogonal to the axial direction.
[0030] like Figure 1 As shown, the rotary electric machine 1 includes a motor 2 and a housing 3. The motor 2 is, for example, a known AC motor. The motor 2 has a rotor 11 capable of rotating about the aforementioned axial direction as the rotation axis and a stator 12 disposed radially outward of the rotor 11. The motor 2 is configured such that the rotor 11 rotates due to the rotating magnetic field generated when an alternating current flows in a coil (not shown) wound around the stator 12.
[0031] The rotor 11 is, for example, a generally cylindrical component with permanent magnets (not shown). The rotor 11 is disposed radially inside the stator 12. A rotating shaft 13 is embedded in the rotor 11. However, the structure of the rotor 11 is not limited to this. For example, the rotor 11 may have multiple salient poles protruding in a direction orthogonal to the direction of the rotating shaft (i.e., the motor 2 may be, for example, a switched reluctance motor). The stator 12 is, for example, a generally cylindrical component made of magnetic components such as carbon steel. The stator 12 is disposed radially outside the rotor 11. The stator 12 is embedded in the housing 3. The stator 12 has a yoke 21 and a plurality of teeth 22, the yoke 21 being a generally cylindrical shape formed throughout the circumference, and the plurality of teeth 22 extending radially inward from a portion of the circumference of the yoke 21. In this embodiment, the six teeth 22 are arranged at approximately equal intervals in the circumference.
[0032] A coil (not shown) is wound around each tooth 22. The coil is electrically connected to a power supply device (not shown). The power supply device supplies power to the motor 2 to make alternating current flow through the coil. More specifically, the power supply device supplies power in such a way that alternating current of the same phase flows through a pair of coils wound on opposite sides of a pair of teeth 22 separated from each other by the rotor 11. In this embodiment, the power supply device supplies power in such a way that three alternating currents with phases 120 degrees apart flow through three pairs of coils respectively (typical three-phase alternating current).
[0033] In this motor 2, if electricity is supplied to the coil as described above, a rotating magnetic field that rotates circumferentially at a predetermined period is generated, and a magnetic force is generated between the magnetic poles of the rotating magnetic field and the rotor 11. As a result, the rotor 11 rotates together with the rotating shaft 13 in a manner that follows the rotating magnetic field.
[0034] The housing 3 is a casing component that houses the motor 2 and has an opening on one side in the axial direction. The housing 3 is, for example, die-cast from an aluminum alloy using a conventional die-casting method. However, the material of the housing 3 does not necessarily have to be aluminum alloy. For example, the housing 3 can be formed from a metal such as iron, or from a component other than a metal. Furthermore, the housing 3 does not necessarily have to be formed by die-casting; it can be formed by other known casting methods. The housing 3 has a flow path 30, which forms a refrigerant flow path 31 for cooling the refrigerant flow of the motor 2. Figure 1 and Figure 2 (a) Figure 2 As shown in (b), the flow path 30 has an inner peripheral wall 32, an outer peripheral wall 33, a bottom 34, an inlet 35, an outlet 36, and a partition wall 37.
[0035] The inner peripheral wall 32 extends axially and is formed throughout the entire circumference. The inner peripheral surface 32a of the inner peripheral wall 32 contacts the outer peripheral surface 12a of the stator 12. Thus, the stator 12 is fitted into the inner peripheral wall 32 of the housing 3. Similarly, the outer peripheral wall 33 extends axially and is formed throughout the entire circumference. The outer peripheral wall 33 is disposed radially outside the inner peripheral wall 32 and is arranged radially with the inner peripheral wall 32. The outer peripheral wall 33 is provided with a radially spaced gap of a predetermined size between it and the inner peripheral wall 32. The size of the gap formed between the inner peripheral wall 32 and the outer peripheral wall 33 is, for example, substantially constant in the circumferential direction (see reference). Figure 3 The bottom 34 is located at the other end of the housing 3 along the axial direction and connects the inner peripheral wall 32 and the outer peripheral wall 33 radially. The inner peripheral wall 32, the outer peripheral wall 33, and the bottom 34 form a generally U-shaped cross-section along the circumferential direction (see reference). Figure 2 (a)) The refrigerant flow path 31. In other words, the refrigerant flow path 31 is formed between the inner peripheral wall 32 and the outer peripheral wall 33.
[0036] The inlet 35 is a portion having an inlet 41 for supplying refrigerant to the refrigerant flow path 31. For example... Figure 1 As shown, the inlet 41 opens at a predetermined position in the circumferential direction on the inner circumferential surface 33a of the outer peripheral wall 33. Furthermore, a supply pipe portion 42 protruding radially outward is provided on the outer peripheral wall 33. A through hole (supply flow path 43) including the inlet 41 is formed from the front end of the supply pipe portion 42 along the inner circumferential surface 33a of the outer peripheral wall 33. The supply flow path 43 is connected to the refrigerant flow path 31 via the inlet 41. In this embodiment, the supply flow path 43 extends in a direction substantially orthogonal to the axial direction, but is not limited thereto.
[0037] The outlet portion 36 is a portion having an outlet 44 for discharging refrigerant from the refrigerant flow path 31. Similar to the inlet 41, the outlet 44 opens into the inner circumferential surface 33a of the outer peripheral wall 33. The circumferential position of the outlet 44 differs from the circumferential position of the inlet 41 (the aforementioned designated position). Furthermore, a discharge pipe portion 45 protruding radially outward is provided on the outer peripheral wall 33. A through hole (discharge flow path 46) including the outlet 44 is formed from the inner circumferential surface 33a of the outer peripheral wall 33 to the front end of the discharge pipe portion 45. The discharge flow path 46 is connected to the refrigerant flow path 31 via the outlet 44. In this embodiment, when viewed axially, the inlet portion 35 and the outlet portion 36 are configured approximately linearly symmetrically across the partition wall portion 37 (see reference). Figure 1 Furthermore, the supply flow path 43 and the discharge flow path 46 are configured to be substantially parallel, but are not limited thereto.
[0038] like Figure 1 As shown, the refrigerant flow path 31 is roughly divided into two parts, for example, by an imaginary straight line L1 extending radially and passing through the center of the inlet 41 and an imaginary straight line L2 extending radially and passing through the center of the outlet 44. That is, the refrigerant flow path 31 is divided into a first flow path 51 and a second flow path 52. The first flow path 51 has a circumferential length of a predetermined length from the inlet 41 to the outlet 44, and the second flow path 52 has a shorter circumferential length from the inlet 41 to the outlet 44 than the first flow path 51. The first flow path 51 occupies approximately a full circumference of the refrigerant flow path 31. In this embodiment, the radial width of the first flow path 51 is approximately constant in the circumferential direction (see reference). Figure 3 The second flow path 52 is the refrigerant flow path 31 after the remaining part of the first flow path 51 has been removed.
[0039] The partition 37 is a portion used to suppress refrigerant flowing into the refrigerant flow path 31 through the inlet 41 from flowing out of the outlet 44 via the short second flow path 52. For example... Figure 1As shown, the partition wall portion 37 is disposed in a portion of the circumferential direction (the middle portion of the second flow path 52) and is radially disposed between the inner peripheral wall 32 and the outer peripheral wall 33. The partition wall portion 37 is integrally formed with the inner peripheral wall 32 and the outer peripheral wall 33 and extends axially (see reference). Figure 2 (a)). Furthermore, the partition wall 37 can be provided as a component distinct from the inner peripheral wall 32 and the outer peripheral wall 33. More details about the partition wall 37 will be described later.
[0040] Furthermore, a generally circular cover member 38 is fixed to one end of the housing 3 along the axial direction, for example by a fixing tool not shown. Thus, the refrigerant flow path 31 is sealed except for the inlet 41 and the outlet 44.
[0041] In the refrigerant flow path 31 described above, most of the refrigerant flowing in through inlet 41 flows toward the first flow path 51, where it flows approximately circumferentially throughout the entire circumference and exits through outlet 44. Thus, through the refrigerant flow, the housing 3 is cooled by the refrigerant, and consequently, the motor 2, which is in contact with the housing 3, is cooled by heat conduction.
[0042] Here, when the rotor 11 rotates, magnetic force acts intermittently between the teeth 22 of the stator 12 and the rotor 11. As a result, the teeth 22 vibrate, and this vibration is transmitted to the entire stator 12. If this vibration is transmitted from the stator 12 to the inner peripheral wall 32, and then, for example, via the partition wall 37, from the inner peripheral wall 32 to the outer peripheral wall 33, the outer peripheral wall 33 may vibrate, potentially generating noise. As a noise countermeasure, one could consider not providing the partition wall 37 to suppress the transmission of vibration from the inner peripheral wall 32 to the outer peripheral wall 33. However, in this case, the second flow path 52 is short-circuited between the inlet 41 and the outlet 44, raising concerns that a large portion of the refrigerant might easily flow into the second flow path 52. Therefore, the amount of refrigerant flowing through the first flow path 51 is significantly reduced, potentially leading to a substantial impairment of cooling function. Therefore, to suppress the reduction in cooling function and to suppress the transmission of stator vibration to the outer peripheral wall 33 of the housing 3, the partition wall 37 of the housing 3 is configured as follows.
[0043] (Next door)
[0044] Next, refer to Figures 1-3 The structure of the partition 37 will be described. For example... Figures 1-3 As shown, a slit 53 is formed in the partition wall portion 37. When viewed axially, the slit 53 extends, for example, in a straight line. The slit 53 connects the two circumferential spaces of the partition wall portion 37. In other words, the slit 53 penetrates the partition wall portion 37 circumferentially (see reference). Figure 1In other words, a gap is formed between the outer and inner portions of the partition wall 37 in the radial direction through the slit 53. Through this gap, the vibration of the stator 12 accompanying the rotation of the rotor 11 is suppressed from being transmitted from the inner peripheral wall 32 to the outer peripheral wall 33 via the partition wall 37.
[0045] Furthermore, slit 53 extends axially (see reference). Figure 2 In the axial direction, the slit 53 extends further to one side than one end face 12b of the stator 12 and further to the other side than one end face 12c of the stator 12. In other words, in the axial direction, the slit 53 extends further to one side than one end face 12a of the outer peripheral surface 12a of the stator 12 and further to the other side than one end face 12a. Further, in other words, the slit 53 extends axially at least from one end face 12a of the outer peripheral surface 12a of the stator 12 to the other end face 12a. That is, on any cross-section orthogonal to the axial direction (e.g., referring to...), the slit 53 extends... Figure 3 The contact portion of the stator 12 with the inner peripheral wall 32 is separated from the outer peripheral wall 33 by a slit 53. Therefore, the vibration of the stator 12 is effectively suppressed from being transmitted from the inner peripheral wall 32 to the outer peripheral wall 33 via the partition portion 37.
[0046] However, through the slit 53, a short-circuit path from inlet 41 to outlet 44 is formed in the second flow path 52. Therefore, the amount of refrigerant flowing into the second flow path 52 increases while the amount flowing into the first flow path 51 decreases, raising concerns about reduced cooling performance. Therefore, as... Figure 3 As shown, the radial width W1 of the slit 53 is narrower than the radial width W2 of the first flow path 51 (the gap between the radial inner peripheral wall 32 and the outer peripheral wall 33). Therefore, the flow resistance of the second flow path 52 increases, thus inhibiting the inflow of refrigerant into the second flow path 52.
[0047] As described above, a gap is formed between the outer and inner portions of the partition wall 37 in the radial direction through the slit 53. This suppresses the transmission of stator 12 vibrations accompanying the rotation of the rotor 11 from the inner peripheral wall 32 to the outer peripheral wall 33. Furthermore, the width W1 of the slit 53 is narrower than the width W2 of the first flow path 51 (the radial gap between the inner and outer peripheral walls 32 and 33), thus increasing the flow resistance of the second flow path 52 and minimizing the inflow of refrigerant into the second flow path 52. Therefore, it is possible to suppress the reduction of cooling function and suppress the transmission of stator 12 vibrations to the outer peripheral wall 33 of the housing 3.
[0048] Furthermore, the slit 53 extends axially from one end of the outer peripheral surface 12a of the stator 12 to the other end. That is, in any cross-section orthogonal to the axial direction, the contact portion of the inner peripheral wall 32 with the stator 12 and the outer peripheral wall 33 are separated by the slit 53. Therefore, the transmission of vibration of the stator 12 from the inner peripheral wall 32 to the outer peripheral wall 33 via the partition wall portion 37 can be effectively suppressed.
[0049] Next, modified examples of the described embodiment will be described. However, parts having the same structure as the described embodiment will be labeled with the same symbols, and their descriptions will be omitted as appropriate.
[0050] (1) In the described embodiment, the slit 53 is assumed to extend in a straight line when viewed from the axial direction, but is not limited thereto. For example, as Figure 4 As shown, in the housing 3a of the rotary motor 1a, a slit 62, which is approximately S-shaped when viewed from the axial direction, can be formed in the partition wall 61. Similar to the slit 53 described above, the slit 62 connects the two circumferential spaces of the partition wall 61. In other words, this slit 62 also penetrates the partition wall 61 circumferentially. The slit 62 is formed to penetrate the partition wall 61 circumferentially, and can be curved as long as it is narrower than the width of the first flow path 51.
[0051] (2) To further suppress the reduction of cooling function, the housing 3b of the rotary motor 1b (reference) Figure 5 It can be constructed as follows. Figure 5 This is a top view of rotary motor 1b. Figure 6 (a) Figure 6 (b) is an explanatory diagram showing the structure near the inlet 41b of the refrigerant flow path 31b. For example... Figure 5 As shown, when viewed axially, the inlet portion 35b with inlet 41b and the outlet portion 36b with outlet 44b do not need to be arranged symmetrically. More specifically, compared to the embodiments described above, the supply flow path 43b can be configured to be inclined relative to the second flow path 52b. In detail, the supply flow path 43b relative to the supply pipe portion 42b and the outer edge 32b of the inner peripheral wall 32 (see reference) Figure 6 (a) Figure 6The relationship between (b) is as follows: The centerline of the center of the flow path in the width direction of the supply flow path 43b is designated as centerline L3. The tangent to the outer edge 32b of the intersection point P of centerline L3 and the outer edge 32b of the inner peripheral wall 32 is designated as tangent L4. In tangent L4, the straight line extending from the intersection point P towards the first flow path 51b is designated as the first straight line L5. Furthermore, in tangent L4, the straight line extending from the intersection point P towards the second flow path 52b is designated as the second straight line L6. At this time, the angle θ1 formed by centerline L3 and the first straight line L5 is an obtuse angle, and the angle θ2 formed by centerline L3 and the second straight line L6 is an acute angle. Therefore, when the refrigerant flowing into the refrigerant flow path 31b through the supply flow path 43b collides with the outer edge 32b of the inner peripheral wall 32, it easily flows towards the first flow path 51b side, and the inflow towards the second flow path 52b side is suppressed. Therefore, the reduction in cooling function can be further effectively suppressed. As an example, such as Figure 6 (a) Figure 6 As shown in (b), angle θ1 is approximately 150 degrees and angle θ2 is approximately 30 degrees.
[0052] (3) Similar to the variation of (2), in order to further suppress the reduction of cooling function, the housing 3c of the rotary motor 1c (reference) Figure 7 It can be constructed as follows. That is, as shown below. Figure 7 As shown, the supply pipe section 42c can be provided in such a way that the supply flow path 43c is not parallel to the discharge flow path 46c but is inclined towards the second flow path 52c. Therefore, the angle between the centerline L7 of the supply flow path 43c and the first straight line L8 corresponding to the first straight line L5 can be set to an obtuse angle. Furthermore, the angle between the centerline L7 and the second straight line L9 corresponding to the second straight line L6 can be set to an acute angle. This allows refrigerant flowing into the refrigerant flow path 31c to easily flow towards the first flow path 51c side, and suppresses the inflow of refrigerant towards the second flow path 52c side.
[0053] (4) In the embodiments described above, the number of teeth 22 of the stator 12 is set to 6, and three-phase AC current flows through the coil, but it is not limited to this. The number of teeth 22 may not be 6, and current other than three-phase AC (e.g., single-phase AC) may flow through the coil. Furthermore, the teeth 22 need not necessarily be arranged at equal intervals in the circumferential direction. The size of all teeth 22 need not necessarily be the same.
[0054] (5) In the embodiments described above, the slit 53 and the like are provided to extend axially from at least one end of the outer peripheral surface 12a of the stator 12 to the other end, but are not limited thereto. For example, the slit may be formed to be axially confined to the inside of the stator 12.
[0055] (6) In the embodiments described above, the width of the first flow path 51 is assumed to be constant in the circumferential direction, but it is not limited to this. The width of the first flow path 51 does not need to be constant in the circumferential direction. In this case, in order to increase the flow resistance of the second flow path 52, it is preferable to configure it such that at least the width of the narrowest part of the slit 53 is smaller than the width of the narrowest part of the first flow path 51.
[0056] (7) In the embodiments described above, the supply flow path 43 and the discharge flow path 46 are provided to be approximately orthogonal to the axial direction, but are not limited thereto. The supply flow path 43 and the discharge flow path 46 do not necessarily have to be orthogonal to the axial direction.
[0057] (8) In the embodiments described above, motor 2 is an AC motor, but it is not limited to this. The present invention can also be applied to DC motors.
[0058] (9) In the embodiments described above, a rotary motor 1 or the like is provided with a motor 2 for rotating the rotating shaft 13, but this is not a limitation. For example, instead of the motor 2, a generator can be provided that rotates the rotating shaft 13 by external force, thereby generating an electromotive force in the coil through electromagnetic induction. Alternatively, the motor 2 can be used as a generator. In this case, since the tooth 22 may vibrate due to the intermittent magnetic force generated between the rotor 11 and the tooth 22, it is effective to isolate the inner peripheral wall 32 and the outer peripheral wall 33 by the slit 53.
[0059] <Reference Example>
[0060] Next, refer to Figure 8 , Figure 9 A reference example for suppressing the inflow of refrigerant to the second flow path side, similar to the variation of (2), will be described. However, parts having the same structure as the embodiments described above will be labeled with the same symbols, and their descriptions will be omitted as appropriate.
[0061] like Figure 8 , Figure 9 As shown, unlike the aforementioned housing 3, the housing 3d of the rotary motor 1d does not have a partition wall. That is, a refrigerant flow path 31d of approximately the same width is provided throughout the circumference, and is divided into a first flow path 51d and a second flow path 52d. Apart from this, the structure of housing 3d is the same as housing 3b. That is, housing 3d has the aforementioned inlet 35b, outlet 36b, inlet 41b, supply pipe 42b, supply flow path 43b, and outlet 44b. Therefore, by setting the angle between the centerline L3 and the first straight line L5 to an obtuse angle, and the angle between the centerline L3 and the second straight line L6 to an acute angle (see reference...), Figure 9 This allows the refrigerant to flow easily to the first flow path 51d side and suppresses the inflow of refrigerant to the second flow path 52d side.
[0062] That is, in the following rotating motor, it is also possible to suppress the reduction of cooling function and suppress the transmission of vibration of stator 12 to the outer peripheral wall 33 of housing 3d.
[0063] A rotary electric motor, comprising:
[0064] The rotor is capable of rotating about a specified axial direction.
[0065] The stator is disposed radially outside the rotor; and
[0066] The rotating electric motor is characterized by having a housing with a refrigerant flow path forming a refrigerant flow path, and housing the rotor and the stator.
[0067] The flow path section has:
[0068] The inner peripheral wall is in contact with the outer peripheral surface of the stator;
[0069] An outer peripheral wall is disposed on the radially outer side of the inner peripheral wall and is configured to form the refrigerant flow path between the outer peripheral wall and the inner peripheral wall;
[0070] The inlet portion has the refrigerant flow path inlet formed at a predetermined position in the circumferential direction orthogonal to both the axial and radial directions; and
[0071] The outlet section has an outlet for the refrigerant flow path formed at a position different from the predetermined position in the circumferential direction.
[0072] The refrigerant flow path includes:
[0073] The first flow path, from the inlet to the outlet, has a circumferential length of a predetermined length; and
[0074] The second flow path has a shorter circumferential length from the inlet to the outlet than the first flow path.
[0075] A supply flow path connected to the refrigerant flow path is formed at the inlet.
[0076] When viewed from the said axial direction
[0077] Among the tangents at the outer edge of the point where the centerline of the supply flow path intersects with the outer edge of the inner peripheral wall, when the straight line extending from the intersection point towards the first flow path side is designated as the first straight line, and the straight line extending from the intersection point towards the second flow path side is designated as the second straight line,
[0078] The angle between the centerline and the first straight line is obtuse, and the angle between the centerline and the second straight line is acute.
[0079] Symbol Explanation
[0080] 1-Rotating motor, 3-House, 11-Rotor, 12-Stator, 12a-Outer peripheral surface, 30-Flow path, 31-Refrigerant flow path, 32-Inner peripheral wall, 32b-Outer edge, 33-Outer peripheral wall, 35-Inlet, 36-Outlet, 37-Blocking wall, 41-Inlet, 43-Supply flow path, 44-Outlet, 51-First flow path, 52-Second flow path, 53-Slit, L3-Centerline, L4-Tangent, L5-First straight line, L6-Second straight line, P-Intersection point, W1-Width, W2-Width, θ1-Angle, θ2-Angle.
Claims
1. A rotary electric motor, comprising: The rotor is capable of rotating about a specified axial direction. The stator is disposed radially outside the rotor; and The rotating electric motor is characterized by having a housing with a refrigerant flow path forming a refrigerant flow path, an axial opening on one side and a closed side, and housing the rotor and the stator. The flow path section has: The inner peripheral wall is in contact with the outer peripheral surface of the stator; An outer peripheral wall is disposed on the radially outer side of the inner peripheral wall and is configured to form the refrigerant flow path between the outer peripheral wall and the inner peripheral wall; The bottom, located at the end on the opposite side of the axial direction of the housing, connects the inner peripheral wall and the outer peripheral wall in the radial direction; The inlet portion has the refrigerant flow path inlet formed at a predetermined position in the circumferential direction orthogonal to both the axial and radial directions; and The outlet section has an outlet for the refrigerant flow path formed at a position different from the predetermined position in the circumferential direction. The refrigerant flow path includes: The first flow path, from the inlet to the outlet, has a circumferential length of a predetermined length; and The second flow path has a shorter circumferential length from the inlet to the outlet than the first flow path. In the second flow path, a partition wall portion is provided radially between the inner peripheral wall and the outer peripheral wall. A slit extending circumferentially is formed in the partition wall portion. The width of the slit is narrower than the width of the first flow path.
2. The rotary motor according to claim 1, characterized in that, The slit extends in the axial direction from at least one end of the outer peripheral surface of the stator to the other end.
3. The rotary motor according to claim 1 or 2, characterized in that, A supply flow path connected to the refrigerant flow path is formed at the inlet. When viewed from the said axial direction Among the tangents at the outer edge of the point where the centerline of the supply flow path intersects with the outer edge of the inner peripheral wall, when the straight line extending from the intersection point towards the first flow path side is designated as the first straight line, and the straight line extending from the intersection point towards the second flow path side is designated as the second straight line, The angle between the center line and the first straight line is an obtuse angle, and the angle between the center line and the second straight line is an acute angle.