A mixed-phase multi-phase fault-tolerant motor cooling structure

Abstract

The present invention provides a mixed-phase multi-phase fault-tolerant motor cooling structure. The structure includes: a stator unit component, a winding, an isolation tooth cooling channel, a stator unit and an oil collecting ring. The stator is composed of a plurality of stator units, and the stator unit is composed of two stator unit components. The stator unit component and the stator unit are axially plugged into each other, and the winding is distributed in each stator unit. The winding bypasses the teeth of the stator unit, and an isolation tooth cooling channel is also arranged between the two stator units and connected to the isolation teeth; the plug-in mating part between the two stator units is the isolation tooth, and the cooling medium in the isolation tooth cooling channel flows through the oil collecting ring at one end to the oil collecting ring at the other end, taking away the heat in the isolation teeth and the stator unit. The present invention proposes a multi-phase fault-tolerant motor isolation tooth cooling structure, which enhances the circumferential heat dissipation capacity of the motor shaft, solves the problem of unbalanced heat distribution when the multi-phase motor is faulty, and makes the motor run at a lower temperature under the same state.

Description

Technical Field

[0001] The invention relates to the field of motor cooling technology and design and manufacturing, and in particular to a mixed-phase multi-phase fault-tolerant motor cooling structure. Background Art

[0002] Multiphase fault-tolerant motors have high reliability and high redundancy, and are widely used in complex and harsh working conditions such as ships and electric vehicles. When a multiphase fault-tolerant motor is in fault operation, fewer windings can provide the same power, which can easily cause the winding temperature to rise too high and then burn the motor. The mixed-phase multiphase fault-tolerant motor cooling structure design method involved in the present invention solves the problem of uneven circumferential temperature rise of the windings during fault operation, improves the heat dissipation capacity of the motor, and then can increase the motor design power in the same space, thereby improving system reliability. The modular multi-phase AC fault-tolerant motor described in Chinese Patent No. 201910906827.1 solves the physical isolation of the motor's electricity, magnetism, and heat from a theoretical level, but does not solve the problem of local overheating during actual fault operation of the motor. The magnetic thermal isolation stator structure and motor described in Chinese Patent No. 202010218499.9 propose structures such as isolation teeth to enhance the physical isolation between windings of different phases, but do not fully utilize the role of structures such as isolation teeth. The present invention can not only achieve stronger physical isolation, but also further optimize the heat dissipation structure in the motor, thereby greatly improving the fault-tolerant operation capability of the fault-tolerant motor. Summary of the invention

[0003] The embodiments of the present invention provide a mixed-phase multi-phase fault-tolerant motor cooling structure, which can ensure the reliability of the multi-phase fault-tolerant motor during fault operation and improve the internal heat dissipation capacity of the motor.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme.

[0005] A mixed-phase multi-phase fault-tolerant motor cooling structure comprises: a stator unit component (1), a winding (2), an isolation tooth cooling channel (3), a stator unit (6) and an oil collecting ring (7);

[0006] The stator in the multi-phase fault-tolerant motor cooling structure is composed of a plurality of stator units (6) axially slotted together, the stator unit (6) is composed of two stator unit components (1), the stator unit component (1) and the stator unit (6) are axially plugged into each other, the winding (2) is distributed in each stator unit (6), the winding (2) bypasses the teeth of the stator unit (6), and an isolation tooth cooling channel (3) is also provided between the two stator units (6), and the isolation tooth cooling channel (3) is connected to the isolation tooth;

[0007] The plug-in mating part between the two stator units (6) is an isolating tooth. A cooling medium flows through the isolating tooth cooling channel (3). The cooling medium flows through an oil collecting ring (7) at one end to an oil collecting ring (7) at the other end, and heat in the isolating tooth and the stator unit is taken away during the flow.

[0008] Preferably, the teeth around which the winding (2) in the stator unit (6) is wound are non-isolated teeth, through which Freon flows, and the stator unit (6) is provided with a Freon cooling channel, in which the Freon flowing through the Freon cooling channel is connected to cooling oil.

[0009] Preferably, the isolation tooth width H is set according to the result of the comprehensive calculation of the electromagnetic-temperature-mechanical strength of the six-phase fault-tolerant motor. q and non-isolated tooth width H N , H N >H q The design magnetic flux density of both the isolated teeth and the non-isolated teeth is less than the saturation magnetic flux density of the stator material under the fault overload condition.

[0010] Preferably, the width of the isolation tooth cooling channel (3) is determined by the maximum winding temperature under various fault modes, and the maximum winding temperature is determined according to the losses under various fault modes, the temperature field inside the motor and the heat dissipation coefficient in the isolation tooth cooling channel (3).

[0011] Preferably, the multi-phase fault-tolerant motor is a six-phase motor composed of modular axial plug-in. During normal fault-free operation, it operates with 6 phases, and during faulty operation, it operates with 5 phases, 4 phases, and 3 phases.

[0012] Preferably, the multi-phase fault-tolerant motor cooling structure further comprises a welding pad (8), and the welding pad (8) is used to complete the reinforced connection between the stator unit component (1) and the stator unit (6) by welding.

[0013] Preferably, the oil collecting ring (7) and the isolation tooth cooling channel (3) are plug-in assembled by means of interference fit.

[0014] Preferably, the assembly method of the multi-phase fault-tolerant motor cooling structure comprises:

[0015] First, the stator unit assembly (1) is assembled into a stator unit (6) by axial plugging, and a gas-liquid mixed state of Freon is filled in the hollow part of the stator unit (6), and then the ends of the stator unit (6) are welded and the stator units (6) are spliced ​​to obtain a complete stator structure;

[0016] The winding (2) is then passed through the stator slot, and then the end of the winding (2) is welded and connected to the external power supply unit of the motor through the reserved lead wire; finally, the isolation tooth cooling channel (3) is plugged into the stator and interference fit with the oil collecting ring (7) to complete the assembly of the entire stator-winding-cooling structure.

[0017] It can be seen from the technical solution provided by the above-mentioned embodiments of the present invention that the method of the embodiments of the present invention overcomes the problem of local temperature rise during faulty operation of existing multi-phase fault-tolerant motors, further improves the electrical, magnetic, thermal and other physical isolation capabilities between different phases, ensures the reliability of multi-phase fault-tolerant motors during faulty operation, and significantly improves the internal heat dissipation capacity of the motor.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of 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.

[0020] Figure 1 A diagram of the motor stator, rotor and winding structure in a mixed-phase multi-phase fault-tolerant motor cooling structure provided by an embodiment of the present invention;

[0021] Figure 2 A method provided by an embodiment of the present invention Figure 1 Enlarged view of the middle stator unit;

[0022] Figure 3 A method provided by an embodiment of the present invention Figure 1 The structural diagram of the stator modular unit;

[0023] Figure 4 A schematic diagram of an external heat dissipation structure of cooling oil provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0025] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or coupling. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0026] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0027] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0028] The stator, rotor and winding structure of a motor provided by the embodiment of the present invention is shown in FIG. Figure 1 As shown, Figure 1 The enlarged view of the stator unit is as follows: Figure 2 As shown, Figure 1 The structure diagram of the stator modular unit is as follows: Figure 3 As shown. Figure 1 , Figure 2 , Figure 3 As shown, the mixed-phase multi-phase fault-tolerant motor cooling structure described in the present invention comprises a stator unit component (1), a winding (2), an isolation tooth cooling channel (3), a permanent magnet (4), a rotor core (5), a stator unit (6), an oil collecting ring (7) and a welding pad (8). The stator is composed of a plurality of stator units (6) axially slotted together, the stator unit (6) is composed of two stator unit components (1), the stator unit component (1) and the stator unit (6) are axially plugged together, and the welding pad (8) is used to complete the reinforcement connection by welding. The plug-in matching part between the two stator units (6) is an isolation tooth, the tooth around which the winding (2) in the stator unit (6) passes is a non-isolation tooth, a cooling medium such as a coolant is passed through the isolation tooth, and freon is passed through the non-isolation tooth.

[0029] The winding (2) is distributed in each stator unit (6) and bypasses the teeth of the stator unit (6). The teeth bypassed by the winding (2) in the stator unit (6) are non-isolated teeth. The teeth matched between the two stator units (6) are hollow and pass cooling oil or other cooling medium. Cooling oil and other coolant are passed through the isolated teeth, and Freon is passed through the Freon cooling channel in the non-isolated teeth. The cooling medium in the isolated teeth is liquid, and the cooling medium in the non-isolated teeth is a gas-liquid mixed state, which together cool the motor stator.

[0030] The oil collecting ring (7) and the isolation tooth cooling channel (3) are plugged and assembled by means of interference fit, so that the entire stator assembly can be completed only by mechanical assembly, avoiding assembly by chemical or heating methods. The cooling medium flows through the oil collecting ring (7) at one end to the oil collecting ring (7) at the other end, and takes away the heat in the isolation teeth and the stator unit during the flow process. Then, the remaining cooling medium is used to convert the hot oil into cold oil through a heat exchanger. At the same time, the stator unit (6) is provided with a Freon cooling channel, and the Freon is connected to the cooling oil to achieve the purpose of circulating cooling of the motor. Figure 4 A schematic diagram of an external heat dissipation structure of cooling oil provided by an embodiment of the present invention. Figure 4 As shown, the cooling oil is supplied from the oil collecting ring on one side to the other side through the pump, and the heat in the isolation teeth and stator unit is taken away during the flow.

[0031] According to the design method of multi-phase fault-tolerant motor, the motor design scheme is calculated. It should be noted that the calculation of the effective magnetic path size of the tooth part should be based on the width of the conventional stator tooth minus the width of the isolation tooth slot to meet the design requirements of the magnetic flux density in the motor design. After calculation, taking the design requirements of a certain type of submersible pump as an example, the corresponding fault-tolerant motor size is obtained: the width of the isolation tooth H q =4.4mm, non-isolated tooth width H N =6.8mm, the average non-isolated magnetic flux density under rated conditions is 1.42T when the six-phase is running, the average non-isolated magnetic flux density with magnetic circuit flow is 1.48T when the five-phase is running, and the average non-isolated magnetic flux density with magnetic circuit flow is 1.64T when the three-phase is running. In the multi-phase fault-tolerant motor without the present invention, the maximum steady-state temperature of the winding is 165°C, and the maximum steady-state temperature of the winding is 148°C after the heat dissipation structure involved in the present invention is used. According to the oil pump flow rate of 1.5L / min, the heat dissipation coefficient in the flow channel is 74W / (m 2 *K).

[0032] Width of isolation teeth H q 、Non-isolated tooth width H N The design is based on the comprehensive calculation results of the electromagnetic-temperature-mechanical strength of the six-phase fault-tolerant motor. N >H q, the design magnetic flux density of the isolation teeth and the non-isolation teeth are both less than the saturation magnetic flux density of the stator material under the fault overload condition. An isolation tooth cooling channel (3) is also provided between the two stator units (6), and the isolation tooth cooling channel (3) is connected to the isolation teeth. The width of the isolation tooth cooling channel (3) affects the width design of the isolation teeth, and the width of the isolation tooth cooling channel (3) is determined by the maximum temperature of the winding under various fault modes, wherein the maximum temperature is determined according to the loss under various fault modes and the temperature field inside the motor, wherein the key to solving the temperature field is to determine the heat dissipation coefficient in the isolation tooth cooling channel (3), wherein the heat dissipation coefficient under the fluid turbulence state is K0=0.021Re 0.8 (Applicable to the isolation gear cooling channel (3) with a length-to-width ratio between 4 and 40).

[0033] The multi-phase fault-tolerant motor is a six-phase motor composed of modular axial plug-in. It operates in 6 phases during normal fault-free operation, and in 5-phase, 4-phase, and 3-phase operation during faulty operation. The cooling structure is designed to address the problem of local temperature rise during faulty operation, quickly removes the heat generated inside the motor, solves the problem of uneven axial and circumferential temperature, and further improves the physical isolation capability between windings of different phases.

[0034] The assembly method of the mixed-phase multi-phase fault-tolerant motor cooling structure of the above-mentioned embodiment of the present invention comprises: firstly, the stator unit assembly (1) is assembled into a stator unit (6) by axial plugging, and the hollow part in the stator unit (6) is filled with gas-liquid mixed Freon, and then the end of the stator unit (6) is welded to prevent leakage; then the stator unit (6) is spliced ​​to obtain a complete stator structure; then the winding (2) is passed through the stator slot, and then the end of the winding (2) is welded and connected to the external power supply unit of the motor through a reserved lead wire; finally, the isolation tooth cooling channel (3) is plugged into the stator and interference fits with the oil collecting ring (7) to complete the assembly of the entire stator-winding-cooling structure.

[0035] To summarize, the embodiment of the present invention proposes a multi-phase fault-tolerant motor isolation tooth cooling structure, which changes the single heat transfer path of traditional external casing cooling and winding spray cooling, enhances the motor shaft-circumferential heat dissipation capacity, solves the problem of unbalanced heat distribution when the multi-phase motor is operating in a faulty state, and makes the motor run at a lower temperature when in the same state.

[0036] The mixed-phase multi-phase fault-tolerant motor cooling structure of the embodiment of the present invention is designed to solve the problem of excessive local temperature rise when the multi-phase fault-tolerant motor is operating in a faulty manner. It is another new cooling method in addition to traditional external casing cooling and end spray oil cooling, which further improves the power density of the motor and effectively reduces the problem of uneven axial temperature distribution of the winding.

[0037] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0038] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A mixed-phase multi-phase fault-tolerant motor cooling structure, characterized in that: include: The stator unit comprises (1), a winding (2), an isolation tooth cooling channel (3), a stator unit (6) and an oil collecting ring (7); The stator in the multi-phase fault-tolerant motor cooling structure is composed of a plurality of stator units (6) axially slotted together, the stator unit (6) is composed of two stator unit components (1), the two stator unit components (1) are axially plugged together, the winding (2) is distributed in each stator unit (6), the winding (2) bypasses the teeth of the stator unit (6), an isolation tooth cooling channel (3) is also provided between the two stator units (6), and the isolation tooth cooling channel (3) is connected to the isolation tooth; The plug-in mating part between the two stator units (6) is an isolating tooth, and a cooling medium flows through the isolating tooth cooling channel (3). The cooling medium flows through the oil collecting ring (7) at one end to the oil collecting ring (7) at the other end, and takes away the heat in the isolating tooth and the stator unit during the flow process; The teeth around which the winding (2) in the stator unit (6) is wound are non-isolated teeth, through which Freon flows. The stator unit (6) is provided with a Freon cooling channel, and the Freon flowing through the Freon cooling channel is in communication with cooling oil.

2. The mixed-phase multi-phase fault-tolerant motor cooling structure according to claim 1 is characterized in that: The isolation tooth width H is set according to the comprehensive calculation results of the electromagnetic-temperature-mechanical strength of the six-phase fault-tolerant motor. q and non-isolated tooth width H N , H N >H q The design magnetic flux density of both the isolated teeth and the non-isolated teeth is less than the saturation magnetic flux density of the stator material under the fault overload condition.

3. The mixed-phase multi-phase fault-tolerant motor cooling structure according to claim 1 is characterized in that: The width of the isolation tooth cooling channel (3) is determined by the maximum temperature of the winding under various fault modes, and the maximum temperature of the winding is determined according to the loss under various fault modes, the temperature field in the motor and the heat dissipation coefficient in the isolation tooth cooling channel (3).

4. The mixed-phase multi-phase fault-tolerant motor cooling structure according to claim 1 is characterized in that: The multi-phase fault-tolerant motor is a six-phase motor composed of modular axial plug-in. It operates with 6 phases during normal and fault-free operation, and with 5 phases, 4 phases, and 3 phases during faulty operation.

5. The mixed-phase multi-phase fault-tolerant motor cooling structure according to claim 1, characterized in that: The multi-phase fault-tolerant motor cooling structure also includes a welding pad (8), and the welding pad (8) is used to complete the reinforced connection between the stator unit component (1) and the stator unit (6) by welding.

6. The mixed-phase multi-phase fault-tolerant motor cooling structure according to claim 1, characterized in that: The oil collecting ring (7) and the isolation tooth cooling channel (3) are plug-in assembled by means of interference fit.

7. The mixed-phase multi-phase fault-tolerant motor cooling structure according to any one of claims 1 to 6, characterized in that: The assembly method of the multi-phase fault-tolerant motor cooling structure comprises: First, the stator unit assembly (1) is assembled into a stator unit (6) by axial plugging, and a gas-liquid mixed state of Freon is filled in the hollow part of the stator unit (6), and then the ends of the stator unit (6) are welded and the stator units (6) are spliced ​​to obtain a complete stator structure; The winding (2) is then passed through the stator slot, and then the end of the winding (2) is welded and connected to the external power supply unit of the motor through the reserved lead wire; finally, the isolation tooth cooling channel (3) is plugged into the stator and interference fit with the oil collecting ring (7) to complete the assembly of the entire stator-winding-cooling structure.

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