Stator winding connection structure and motor

Abstract

The invention belongs to the technical field of aviation electromechanical systems, and discloses a stator winding connection structure and a motor, the stator winding connection structure comprises a coil and a punching sheet, a coil is wound on one tooth of the punching sheet, the winding connection structure comprises a first structure and a second structure, and the first structure and the second structure are controlled to be switched through a switch module; the first structure is that every two coils are connected end to end and then connected in parallel to form a winding, and the second structure is that every two coils are connected end to end in parallel to form a winding; the first structure is used for high temperature, and the second structure is used for low temperature. The invention has the advantages of simple material selection structure, high processing efficiency and stable and reliable performance, and can meet the use requirements of high and low temperature operation after the motor is immersed in lubricating oil. According to the invention, different stator winding connection structure forms are automatically switched by adopting the temperature control switch, so that rapid and automatic switching of high and low temperature performance of the motor is realized, and the use requirements of different states of the motor are met.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation electromechanical systems, and pertains to a stator winding structure and a motor, and in particular to a winding and control method of a permanent magnet synchronous motor immersed in aviation lubricating oil. Background Art

[0002] With the development of aviation engine technology, the lubricating oil delivery device is being updated and replaced. Electric lubricating oil pumps are gradually replacing the original gear transmission structure, which in turn increases the demand for motors for lubricating oil pumps. Compared with traditional motors, the ambient temperature and medium temperature of motors for lubricating oil pumps can reach -55℃~+150℃. At high temperatures, the lubricating oil has good fluidity and the motor can start smoothly. At low temperatures, due to the viscosity of the lubricating oil, the motor consumes a large amount of torque and current when starting at low temperatures. Traditional electric gear pumps all use dynamic sealing to prevent the medium from entering the motor body. The sealing cups used in dynamic sealing have low reliability and short service life. Conventional internally immersed aviation lubricating oil motors cannot meet the requirements for low-temperature starting. Increasing the motor volume and power to increase the starting torque is low and difficult to meet the needs.

[0003] No relevant technology has been found for the winding and control of aviation oil-immersed motors. The traditional winding control method is difficult to meet the requirements of motors at low temperatures, and the conventional winding method is complex, difficult to process, low in efficiency, and consumes a lot of labor costs. Increasing the motor volume and power improves the low-temperature starting of the motor, but it cannot meet the starting current requirements. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a stator winding connection structure and a motor with a simple offline process. The structure switches different winding connection structures under high and low temperature environments, so that the motor has a small low-temperature starting current and high high-temperature operation efficiency.

[0005] The technical solution of the present invention is as follows:

[0006] A stator winding connection structure comprises a coil and a punching sheet, wherein one tooth on the punching sheet is wound with one turn of the coil, and the winding connection structure comprises structure one and structure two, and the switching between structure one and structure two is controlled by a switch module; structure one is: every two coils are connected end to end and then connected in parallel to form a winding, and structure two is: every two coils are connected end to end in parallel to form a winding; structure one is used for high temperature, and structure two is used for low temperature.

[0007] Furthermore, the temperature control between structure one and structure two is switched by a switch module.

[0008] A motor comprises a housing assembly, a resolver bracket, a stator assembly, a rotor assembly, a resolver stator, a resolver rotor, and a shaft, wherein the stator assembly is a stator winding connection structure as described above; the outer side of the rear section of the shaft is connected to the rotor assembly, the stator assembly is mounted on the housing assembly corresponding to the outer side of the rotor assembly, the front section of the shaft is connected to the resolver rotor, the resolver stator is arranged on the outer side of the resolver rotor, and the resolver bracket is supported between the shaft and the housing assembly, specifically between the front section and the rear section of the shaft.

[0009] Furthermore, the motor is an oil-immersed motor, and the shaft adopts a hollow shaft structure. The high-pressure lubricating oil on the flange surface of the protruding end of the shaft flows into the interior of the motor through the oil guide groove between the housing assembly and the stator assembly and the stator-rotor air gap, so that the motor is immersed in the lubricating oil medium and flows out from the low-pressure area through the center hole of the shaft, thereby realizing oil circulation inside the motor and achieving heat exchange inside and outside the motor through the circulating oil.

[0010] Furthermore, the bearings supporting the shaft inside the motor are graphite bearings.

[0011] Furthermore, the bearing is provided with an open groove, which is L-shaped and is respectively arranged on the end surface and the inner wall surface of the bearing. There are multiple open grooves in the bearing and they are evenly distributed around the circumference.

[0012] Furthermore, the permanent magnets of the motor are made of samarium praseodymium cobalt rare earth magnets; the winding coils of the stator assembly are made of high-strength modified polyester enameled round copper wire QY(F) / 260, the stator is impregnated with H-grade polyimide insulating varnish 1150, and the slot insulation material is made of polyimide film composite material 6050.

[0013] Furthermore, the rotary transformer stator is composed of electrical steel and copper windings, and the rotary transformer rotor is composed of electrical steel.

[0014] Technical effects of the present invention:

[0015] 1. The present invention has simple material selection and structure, high processing efficiency, stable and reliable performance, and can meet the use requirements of the motor running at high and low temperatures after being immersed in lubricating oil.

[0016] 2. The present invention adopts a temperature control switch to automatically switch between different stator winding connection structures, thereby realizing rapid and automatic switching of the high and low temperature performance of the motor and meeting the use requirements of the motor in different states. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structure of the motor winding method of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure 2 of the motor winding method of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the motor of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the resolver bracket;

[0022] Figure 5 It is a schematic diagram of the structure of the front bearing and the rear bearing.

[0023] Among them, 1 is the housing assembly, 2 is the resolver bracket, 3 is the stator assembly, 4 is the rotor assembly, 5 is the resolver stator, 6 is the resolver rotor, 7 is the end cover, 8 is the front bearing, 9 is the rear bearing, 10 is the self-locking nut, 11 is the wire cover, 12 is the socket, and 13 is the shaft. DETAILED DESCRIPTION

[0024] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the orientations or positional relationships in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] Embodiment 1:

[0028] A stator winding connection structure comprises a coil and a punching sheet, wherein one tooth on the punching sheet is wound with one turn of the coil, and the winding connection structure comprises structure one and structure two, and the switching between structure one and structure two is controlled by a switch module; structure one is: every two coils are connected end to end and then connected in parallel to form a winding, and structure two is: every two coils are connected end to end in parallel to form a winding; structure one is used for high temperature, and structure two is used for low temperature.

[0029] The temperature control between structure one and structure two is switched by a switch module.

[0030] A motor comprises a housing assembly 1, a resolver bracket 2, a stator assembly 3, a rotor assembly 4, a resolver stator 5, a resolver rotor 6, and a shaft 13, wherein the stator assembly 3 is a stator winding connection structure as described above; the outer side of the rear section of the shaft 13 is connected to the rotor assembly 4, the stator assembly 3 is mounted on the housing assembly 1 corresponding to the outer side of the rotor assembly 4, the front section of the shaft 13 is connected to the resolver rotor 6, the resolver stator 5 is arranged on the outer side of the resolver rotor 6, and the resolver bracket 2 is supported between the shaft 13 and the housing assembly 1, specifically between the front section and the rear section of the shaft 13.

[0031] The motor is an oil-immersed motor, and the shaft 13 adopts a hollow shaft structure. The high-pressure lubricating oil on the flange surface of the protruding end of the shaft 13 flows into the interior of the motor through the oil guide groove between the housing assembly 1 and the stator assembly 3 and the stator-rotor air gap, so that the motor is immersed in the lubricating oil medium and flows out from the low-pressure area through the central through hole of the shaft 13, thereby realizing oil circulation inside the motor and achieving heat exchange inside and outside the motor through the circulating oil.

[0032] The bearings supporting the shaft 13 inside the motor are graphite bearings.

[0033] The bearing is provided with an open groove, which is L-shaped and is respectively arranged on the end face and the inner wall face of the bearing. There are multiple open grooves in the bearing and they are evenly distributed around the circumference.

[0034] The permanent magnets of the motor are made of samarium praseodymium cobalt rare earth magnets; the winding coils of the stator assembly 3 are made of high-strength modified polyester enameled round copper wire QY(F) / 260, the stator is impregnated with H-grade polyimide insulating varnish 1150, and the slot insulation material is made of polyimide film composite material 6050.

[0035] The rotary transformer stator 5 is composed of electrical steel and copper windings, and the rotary transformer rotor 6 is composed of electrical steel.

[0036] Embodiment 2:

[0037] like Figure 2-4As shown, the present invention relates to a stator winding connection and a motor, comprising: a housing assembly 1, a resolver bracket 2 assembly, a stator assembly 3, a rotor assembly 4, a resolver stator 5, a resolver rotor 6, an end cover 7, a front bearing 8, a rear bearing 9, a self-locking nut 10, a wire protection sleeve 11, and a socket 12; wherein the end cover 7, the stator assembly 3, the resolver bracket 2 assembly and the front bearing 8 are fixed on the housing, the rear bearing 9 is fixed on the resolver bracket 2, the front and rear bearings 9 provide support for the rotor assembly 4, the resolver stator 5 is mounted on the resolver bracket 2, and the resolver rotor 6 is mounted on the rotor assembly 4.

[0038] In some embodiments, the stator assembly 3 is connected as follows Figure 1 (a) is shown, which is suitable for high-speed operation of the motor and switches to Figure 1 (b) Connection method.

[0039] In some embodiments, the rotary transformer stator 5 is composed of electrical steel and copper windings, and the rotary transformer rotor 6 is composed of electrical steel. The stator electrical steel and copper windings provide voltage for the rotary transformer and feedback rotor position signals, and the rotor electrical steel provides rotor position information for the rotary transformer.

[0040] In some embodiments, the stator assembly 3 is composed of electrical steel and copper windings, and the rotor assembly 4 is composed of permanent magnets and stainless steel. The stator assembly electrical steel and copper windings provide a rotating magnetic field for the motor, and the rotor assembly permanent magnets provide a constant magnetic field for the motor.

[0041] In some embodiments, the shaft 13 is a through hole structure, and the bearing has an open groove. The motor relies on lubricating oil to dissipate heat. The flow path enters the motor through the front bearing 8, passes through the stator and rotor assembly 4 and the rear bearing 9, and then flows out from the motor shaft, providing a cooling circuit for the motor.

[0042] In some embodiments, the wire sheath 11 is made of aluminum alloy to prevent the three-phase wires of the motor from contacting moving parts.

[0043] In some embodiments, the socket 12 provides power to the motor while preventing the liquid inside the motor from leaking out.

[0044] In some embodiments, the opening groove is L-shaped and is respectively arranged on the bearing end surface and the inner wall surface.

[0045] In some embodiments, there are three open slots and they are evenly distributed around the circumference.

[0046] Working principle:

[0047] A stator winding connection and motor winding structure as Figure 1 As shown, the motor structure is as follows Figure 2As shown, it is mainly composed of a housing assembly 1, a resolver bracket 2 assembly, a stator assembly 3, a rotor assembly 4, a resolver stator 5, a resolver rotor 6, an end cover 7, a front bearing 8, a rear bearing 9, a self-locking nut 10, a wire protection sleeve 11, and a socket 12. The specific structure and assembly implementation are as follows:

[0048] (1) The rotary transformer stator 5 is mounted on the rotary transformer bracket 2. The inner hole of the rotary transformer rotor 6 is mounted on the shaft with clearance fit and fixed with a self-locking nut 10. The rotary transformer material is stainless steel, permanent magnet and copper winding to improve the temperature resistance of the motor. The specific structure is as follows: Figure 1 As shown;

[0049] (2) The resolver bracket 2 is fixed to the inner step of the housing assembly 1 by screws. The outer circle of the resolver bracket 2 and the inner circle of the housing are matched in a clearance fit. The inner circle of the resolver bracket 2 and the outer circle of the rear bearing 9 are interference fit. The through hole on it is convenient for the stator assembly 3 installation line and cooling oil to pass through. The structure of the resolver bracket 2 is shown in FIG. Figure 3 As shown;

[0050] (3) The stator assembly 3 is made by winding the armature winding on the stator core, vacuum impregnating the silicone impregnation insulating varnish 1150, and hot pressing it into the shell. The outer circle of the stator assembly 3 and the inner circle of the shell adopt interference fit;

[0051] (4) The motor shaft 13 in the rotor assembly 4 is a hollow shaft. It provides a channel for oil circulation. The structure of the rotor is shown in Figure 1 As shown;

[0052] (5) The front and rear bearings 8 and 9 are made of graphite, and open grooves are designed at their ends and inner circles to provide lubrication. For specific structure, see Figure 4 The new rotor position detection method greatly increases the motor operating temperature and improves the detection accuracy.

[0053] The invention proposes a stator winding connection and a motor

[0054] The processing method may include the following steps:

[0055] The stator assembly of the present invention can be processed with one tooth and one turn of wire, which is convenient for construction. After each tooth is wound, the stator assembly is installed in the housing, and the winding turns are connected to the connector 12. The conduction state in the winding is controlled by controlling the connection between the turns. Figure 1 Each state has two teeth connected end to end for four turns, and the tails are connected in parallel to form 1 state. Figure 2 Every two teeth in the state are connected end to end, and the tails are connected in parallel to form 2 states.

[0056] Embodiment 3:

[0057] The motor stator winding adopts one tooth to wind one turn of coil, and the winding connection mode can be controlled by the temperature control switch module. At high temperature, every two coils are connected end to end and then connected in parallel to form a winding. At low temperature, every two coils are connected end to end in parallel to form a winding.

[0058] The motor shaft adopts a hollow shaft structure. The high-pressure lubricating oil on the flange surface of the motor shaft extension end flows into the motor through the oil guide groove between the motor housing and the stator and the air gap between the stator and the rotor, so that the motor is immersed in the lubricating oil medium and flows out from the low-pressure area through the central through hole of the motor rotor, realizing the oil circulation inside the motor. The circulating oil realizes heat exchange between the inside and outside of the motor, which is used to dissipate heat from the motor stator.

[0059] When lubricating oil enters the motor, the grease of the traditional ball bearing will be washed out under this condition. If the lubricating oil medium is cut off, the ball bearing will be stuck. For this reason, the motor uses graphite bearings instead of ball bearings to ensure the reliable operation of the motor under oil-intake conditions, and can also run for a short time under oil-free conditions;

[0060] The bearing opening groove is L-shaped and is respectively arranged on the bearing end surface and the inner wall surface. There are multiple bearing opening grooves and they are evenly distributed around the circumference.

[0061] The shaft is a through hole structure, and the bearing is provided with an open groove. The motor internally dissipates heat by lubricating oil, and the flow path enters the motor internally through the front bearing, passes through the stator and rotor assembly, and flows out from the motor shaft after the rear bearing, providing a cooling circuit for the motor.

[0062] The motor permanent magnets are made of samarium praseodymium cobalt rare earth magnets. The maximum operating temperature of the magnets can reach 350°C, and the negative temperature coefficient is small, about -0.03% / °C. After the motor has been working for a long time and has generated heat, the magnetic properties of the magnets change very little and a certain margin is left. When designing the stator, the winding coils are made of high-strength modified polyester enameled round copper wire QY(F) / 260. The enameled wire can work for a long time at 260°C and can reach 300°C for a short time. The stator is impregnated with H-grade polyimide insulating varnish 1150, and the slot insulation material is made of polyimide film composite material 6050. The polyimide insulating material can still maintain a high strength and breakdown voltage at 300°C, ensuring that the motor stator can work reliably at 240°C.

[0063] The motor uses a brushless resolver transmitter to detect the rotor position and eliminates the Hall sensor to prevent abnormal product operation due to failure of the Hall sensor in a high temperature environment.

[0064] The stator of the rotary transformer is composed of electrical steel and copper windings, and the rotor of the rotary transformer is composed of electrical steel. The stator electrical steel and copper windings provide voltage for the rotary transformer and feed back rotor position signals, and the rotor electrical steel provides rotor position information for the rotary transformer.

[0065] The stator assembly is composed of electrical steel and copper windings, and the rotor assembly is composed of permanent magnets and stainless steel. The electrical steel and copper windings provide a rotating magnetic field for the motor, and the permanent magnets provide a constant magnetic field for the motor.

[0066] A radial seal is used between the motor end cover and the housing to seal the internal structure of the motor and prevent the internal oil of the motor from leaking between the end cover and the housing, causing the performance of the lubricating oil pump to deteriorate.

[0067] The wire protection sleeve is made of aluminum alloy material to prevent the three-phase wires of the motor from contacting with moving parts.

[0068] The socket supplies power to the motor and prevents leakage of liquid inside the motor.

[0069] The temperature of the lubricating oil medium used in the motor of the present invention is between -55°C and +150°C, so the high and low temperature concept of the present invention is also based on this. After the lubricating oil temperature drops to a certain level (related to the type of lubricating oil itself at a specific temperature), the lubricating oil will become noticeably viscous. This change is not linear with temperature, but abrupt at a certain low temperature point. Therefore, this low temperature point is set to a low temperature, that is, the switching temperature of the temperature control switch.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A stator winding connection structure, characterized in that: It includes a coil and a punching sheet, one turn of the coil is wound on one tooth of the punching sheet, the winding connection structure includes structure one and structure two, and the switching between structure one and structure two is controlled by a switch module; structure one is: every two coils are connected end to end and then connected in parallel to form a winding, and structure two is: every two coils are connected end to end in parallel to form a winding; structure one is used for high temperature, and structure two is used for low temperature.

2. A stator winding connection structure according to claim 1, characterized in that: The temperature control between structure one and structure two is switched by a switch module.

3. A motor, comprising a housing assembly (1), a resolver bracket (2), a stator assembly (3), a rotor assembly (4), a resolver stator (5), a resolver rotor (6), and a shaft (13), wherein the stator assembly (3) is a stator winding connection structure as claimed in claim 1 or 2; characterized in that: The outer side of the rear section of the shaft (13) is connected to the rotor assembly (4), the stator assembly (3) is mounted on the housing assembly (1) on the outer side of the corresponding rotor assembly (4), the front section of the shaft (13) is connected to the rotary transformer rotor (6), the rotary transformer stator (5) is arranged on the outer side of the corresponding rotary transformer rotor (6), and the rotary transformer bracket (2) is supported between the shaft (13) and the housing assembly (1), specifically, between the front section and the rear section of the shaft (13).

4. A motor according to claim 3, characterized in that: The motor is an oil-immersed motor. The shaft (13) adopts a hollow shaft structure. The high-pressure lubricating oil on the flange surface of the protruding end of the shaft (13) flows into the motor through the oil guide groove between the housing component (1) and the stator component (3) and the stator-rotor air gap, so that the motor is immersed in the lubricating oil medium and flows out from the low-pressure area through the central through hole of the shaft (13), thereby realizing oil circulation inside the motor and realizing heat exchange inside and outside the motor through the circulating oil.

5. A motor according to claim 4, characterized in that: The bearings of the motor internal support shaft (13) are graphite bearings.

6. A motor according to claim 5, characterized in that: The bearing is provided with an open groove, which is L-shaped and is respectively arranged on the end face and the inner wall face of the bearing. There are multiple open grooves in the bearing and they are evenly distributed around the circumference.

7. The motor according to claim 4, characterized in that: The permanent magnet of the motor is made of samarium praseodymium cobalt rare earth magnet steel; the winding coil of the stator component (3) is made of high-strength modified polyester enameled round copper wire QY(F) / 260, the stator is impregnated with H-grade polyimide insulating varnish 1150, and the slot insulation material is made of polyimide film composite material 6050.

8. The motor according to claim 4, characterized in that: The rotary transformer stator (5) is composed of electrical steel and copper windings, and the rotary transformer rotor (6) is composed of electrical steel.

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