Modularized manufacturing magnetic isolation motor

Abstract

The invention discloses a modularly manufactured magnetic isolation motor, and belongs to the technical field of power generation, power transformation or power distribution. The motor comprises a plurality of stator modules and a rotor. The plurality of stator modules are sequentially clung to form a complete stator; optionally, a plurality of stator modules are uniformly distributed along the circumference, and the stator modules are fixed through external connecting pieces. The stator module comprises three stator teeth and armature windings which are intensively wound on the middle stator teeth. Magnetic flux generated by the armature winding only passes through the stator module where the armature winding is located and does not pass through other stator modules, and magnetic isolation and physical isolation between different stator modules are achieved. From any stator module, a plurality of continuous stator modules are located in the same independent sector, and all the stator modules and the rotor in the sector form a unit multi-phase motor. Physical isolation and magnetic isolation between different windings of the motor are realized, the electromagnetic performance and the operation reliability of the motor are improved, and the processing cost of the motor is reduced.

Description

Technical Field

[0001] The invention relates to motor driving technology, in particular to modular production of magnetically isolated motors, and belongs to the technical field of power generation, power transformation or power distribution. Background Art

[0002] At present, the electric vehicle drive motors commonly used in the industry mostly use three-phase distributed windings, which have the following four disadvantages: (1) The winding ends are long, the copper content is high, the resistance is large, and the copper loss is high; (2) The automated winding process is complex and the production efficiency is low; (3) The mutual inductance between the winding coils is large and the fault tolerance is weak; (4) All windings are divided into only three phases, each phase has many turns, and the bus voltage requirements are high after high speed. Motors with modular stator structures are favored because of their simple processing, high slot fill rate, and low manufacturing cost. Chinese patent with publication number CN111313576A discloses a modular permanent magnet motor; Chinese patent with publication number CN109599958A discloses a new type of permanent magnet motor with high reliability and high power density; Chinese patent with publication number CN106787280A discloses a modular three-phase AC permanent magnet variable frequency speed regulating motor; Chinese patent with publication number CN108768016A discloses a stator of a winding staggered hub motor and a winding staggered hub motor device; Chinese patent with publication number CN1967970 discloses a stator assembly of a motor and a manufacturing method thereof. The above patents all propose motors with modular stator structures, but windings are wound on all stator teeth, which leads to serious magnetic coupling between different windings, and a single winding failure will affect the normal operation of the remaining windings.

[0003] A modular stator structure with high magnetic isolation capability can improve the reliability of motor operation and reduce processing costs. The Chinese patent with publication number CN111082548A discloses a stator modular hybrid excitation alternating pole flux reversal motor, in which permanent magnets are attached to the surface of the stator teeth. The stator of this structure cannot be used on a rotor permanent magnet motor. The Chinese patent with publication number CN101951041A discloses a modular combined motor stator structure and its application. Its magnetic isolation teeth are exactly the same size as the winding teeth, the magnetic circuit design is inflexible, and there is a lack of optimization space. The Chinese patent with publication number CN101300729A discloses a multi-phase motor for wheels, which uses an E-shaped stator module, but the width of the magnetic isolation teeth is the same as that of the winding teeth. The splicing of the magnetic isolation teeth of two adjacent modules causes the stator structure to be asymmetric, which increases the spatial harmonics. The Chinese patent with publication number CN103762759A discloses a radial flux modular multiphase motor with high magnetic isolation capability, the submodule of the multiphase motor is a five-tooth structure, and the windings of the submodule are reversely wound, the two sets of windings of the submodule are coupled to each other, and the utilization rate of the magnetic isolation teeth is low. The Chinese patent with publication number CN1862928A discloses a stator module structure low-speed DC brushless motor, the stator module structure realizes the decoupling of magnetic flux between different phases, but is limited to a three-phase system. Summary of the invention

[0004] The object of the present invention is to provide a modular magnetic isolation motor in view of the shortcomings of the above-mentioned background technology. The stator of the motor is simple to process, the winding is easy to mechanically wind, and it has high fault tolerance. The stator module can be used to customize various types of multi-phase motors to achieve the invention purpose of magnetic isolation and physical isolation of adjacent stator modules and the invention purpose of magnetic isolation of adjacent unit motor modules, and solve the technical problems of inflexible magnetic circuit design of existing modular stator structures, low utilization rate of magnetic isolation teeth and limited application.

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned invention object:

[0006] The modular magnetic isolation motor mentioned in the present invention includes a complete stator assembled from n stator modules and a rotor, and the complete stator and the rotor are coaxially installed. The stator module includes a stator core, three stator teeth and a concentrated winding, and the three stator teeth are sequentially a first stator tooth, a second stator tooth, and a third stator tooth, and a concentrated winding is wound on the second stator tooth.

[0007] When current is passed through the concentrated winding, the magnetic circuit of the magnetic lines of force generated by the current is the second stator tooth, the first stator tooth, and the third stator tooth. The magnetic lines of force generated by the armature winding on the second stator tooth only pass through the stator module where it is located, and the magnetic lines of force do not pass through the second stator teeth of any other stator modules, thereby achieving magnetic isolation and physical isolation between different stator modules.

[0008] Preferably, a complete stator can be constructed by placing n stator modules closely one after the other.

[0009] Preferably, the complete stator may be composed of n stator modules evenly distributed along the circumference, and the n stator modules are fixed by external connecting members.

[0010] Preferably, the external connecting member may be a solid material that is magnetically conductive, such as ordinary steel; or a solid material that is non-magnetically conductive, such as stainless steel; or a hollow structure may be used while ensuring structural rigidity.

[0011] Further, the first stator tooth and the third stator tooth have the same width. The widths of the first stator tooth and the third stator tooth may be inconsistent with the width of the second stator tooth.

[0012] Furthermore, if the motor is an m-phase motor (m is an integer and m≥3), starting from any stator module, every m stator modules constitute a unit m-phase motor, that is, n stator modules can be divided into k unit m-phase motors in turn, and each unit m-phase motor belongs to an independent sector. It should satisfy n=k*m, where k represents the number of independent sectors, k is an integer and k≥1.

[0013] The modularized magnetically isolated motor of the present invention can be an outer rotor inner stator motor or an inner rotor outer stator motor.

[0014] The modular magnetic isolation motor of the present invention can be a surface mounted permanent magnet motor, an embedded permanent magnet motor, or a switched reluctance motor.

[0015] The modular magnetic isolation motor of the present invention may be a three-phase motor or a multi-phase motor.

[0016] The present invention adopts the above technical solution and has the following beneficial effects:

[0017] (1) The stator modular structure disclosed in the present invention is a three-tooth structure of a first stator tooth, a second stator tooth, and a third stator tooth formed on a stator core. The winding is concentratedly wound only on the second stator tooth. After the concentrated winding is energized, a magnetic circuit that does not pass through the second stator teeth of other stator modules is generated in the stator module. The first stator teeth and the third stator teeth of two adjacent stator modules not only realize the physical isolation between different stator modules but also realize the magnetic isolation between different stator modules, thereby reducing the influence of the fault phase on the remaining phase and improving the reliability of the motor operation. The stator modular structure is adopted, the stator is easy to process, and the mass production capacity is improved.

[0018] (2) The winding process of the present invention is simple, the winding ends are short and do not overlap each other, which effectively improves the motor slot fill rate and reduces the winding manufacturing cost.

[0019] (3) The stator modular structure of the present invention is applicable to any unit-phase motor, and can overcome the defect that the existing modular stator structure is limited to three-phase unit motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the motor structure of Example 1 of the present invention.

[0021] Figure 2 It is a schematic diagram of the motor structure of Example 2 of the present invention.

[0022] Figure 3 It is a schematic diagram of the motor structure of Example 3 of the present invention.

[0023] Figure 4 It is a schematic diagram of the motor structure of Example 4 of the present invention.

[0024] Figure 5 It is a magnetic field simulation diagram of Example 1 of the present invention.

[0025] Figure 6 It is a magnetic field simulation diagram of Example 3 of the present invention.

[0026] Explanation of the numbers in the figure: 1. stator module; 2. rotor; 3. concentrated winding; 4. first stator tooth; 5. second stator tooth; 6. third stator tooth; 7. independent sector; 8. first-phase stator module within a single independent sector; 9. second-phase stator module within a single independent sector; 10. third-phase stator module within a single independent sector; 11. fourth-phase stator module within a single independent sector; 12. fifth-phase stator module within a single independent sector; 13. external connector; 14. magnetic lines of force. DETAILED DESCRIPTION

[0027] The technical solution of the invention is described in detail below with reference to the accompanying drawings.

[0028] Example 1: Three-phase modular motor with phase magnetic separation capability

[0029] like Figure 1 As shown, a three-phase modular motor with phase magnetic isolation capability is an inner rotor and outer stator motor, the modular motor includes a complete stator and a rotor 2, the complete stator is coaxially installed with the rotor 2, and the complete stator is composed of fifteen stator modules 1 closely attached in sequence; the stator module 1 includes a stator core, three stator teeth and a concentrated winding 3, the three stator teeth are the first stator tooth 4, the second stator tooth 5, and the third stator tooth 6 in sequence, a concentrated winding 3 is wound on the second stator tooth 5, the first stator tooth 4 and the third stator tooth 6 have the same width, and the width of the first stator tooth 4 and the third stator tooth 6 is inconsistent with the width of the second stator tooth 5.

[0030] When current is passed through the concentrated winding, the following is generated: Figure 5 As shown in the magnetic lines of force 14 , the magnetic flux generated by the armature winding on the second stator tooth 5 only passes through the stator module 1 where it is located, and does not pass through the second stator teeth of other stator modules 1 , that is, it is not coupled with the armature windings on other stator modules 1 , thereby achieving magnetic isolation and physical isolation between different stator modules 1 .

[0031] like Figure 1 As shown, the modular motor is a three-phase motor. Starting from any stator module, every three electronic modules constitute a unit three-phase motor. For example, to constitute a unit three-phase motor, that is, fifteen stator modules can be divided into five unit three-phase motors in turn. Each unit three-phase motor belongs to an independent sector 7, and the independent sector includes a first-phase stator module 8 in a single independent sector, a second-phase stator module 9 in a single independent sector, and a third-phase stator module 10 in a single independent sector. Since the present invention realizes magnetic isolation and physical isolation between different stator modules, multiple unit three-phase motors divided on a complete stator can also realize magnetic isolation and physical isolation between the unit three-phase motors.

[0032] Example 2: Five-phase modular motor with phase magnetic separation capability

[0033] like Figure 2 As shown, a five-phase modular motor with phase magnetic isolation capability is an inner rotor outer stator motor, which includes a complete stator and a rotor 2, and the complete stator is coaxially installed with the rotor 2. The complete stator is composed of fifteen stator modules 1 closely attached in sequence; the stator module 1 includes a stator core, three stator teeth and a concentrated winding 3, the three stator teeth are the first stator tooth 4, the second stator tooth 5, and the third stator tooth 6 in sequence, a concentrated winding 3 is wound on the second stator tooth 5, the first stator tooth 4 and the third stator tooth 6 have the same width, and the width of the first stator tooth 4 and the third stator tooth 6 is inconsistent with the width of the second stator tooth 5. The magnetic flux generated by the armature winding on the second stator tooth 5 only passes through the stator module 1 where it is located, and does not pass through the second stator teeth of other stator modules 1, that is, it is not coupled with the armature winding on other stator modules 1, and the magnetic isolation and physical isolation between different stator modules 1 are realized.

[0034] like Figure 2As shown, the modular motor is a five-phase motor. Starting from any stator module, every five stator modules constitute a unit five-phase motor, that is, fifteen stator modules can be divided into three unit five-phase motors in turn, and each unit five-phase motor belongs to an independent sector 7. The independent sector includes a first-phase stator module 8 in a single independent sector, a second-phase stator module 9 in a single independent sector, a third-phase stator module 10 in a single independent sector, a fourth-phase stator module 11 in a single independent sector, and a fifth-phase stator module 12 in a single independent sector. Since the present invention realizes magnetic isolation and physical isolation between different stator modules, multiple unit five-phase motors divided on a complete stator can also realize magnetic isolation and physical isolation between unit five-phase motors.

[0035] Example 3: Three-phase modular motor with phase magnetic separation capability

[0036] like Figure 3 As shown, a three-phase modular motor with phase magnetic isolation capability is an inner rotor outer stator motor, the modular motor includes a complete stator and a rotor 2, the complete stator is coaxially installed with the rotor 2; the complete stator is evenly distributed along the circumference by six stator modules 1, the six stator modules 1 are fixed by external connectors 13, the external connectors 13 can be solid magnetic conductive materials such as ordinary steel, or solid non-magnetic conductive materials such as stainless steel, or a hollow structure can be used while ensuring structural rigidity; the stator module 1 includes a stator core, three stator teeth and a concentrated winding, the three stator teeth are the first stator tooth 4, the second stator tooth 5, and the third stator tooth 6 in sequence, a concentrated winding 3 is wound on the second stator tooth 5, the first stator tooth 4 and the third stator tooth 6 have the same width, and the width of the first stator tooth 4 and the third stator tooth 6 is inconsistent with the width of the second stator tooth 5.

[0037] When current is passed through the concentrated winding, the following is generated: Figure 6 As shown in the magnetic lines of force 14 , the magnetic flux generated by the armature winding on the second stator tooth only passes through the stator module 1 where it is located, and does not pass through the second stator teeth of other stator modules 1 , that is, it is not coupled with the armature windings on other stator modules 1 , thereby achieving magnetic isolation and physical isolation between different stator modules 1 .

[0038] like Figure 3 As shown, the modular motor is a three-phase motor. Starting from any stator module, every three stator modules constitute a unit three-phase motor, that is, the six stator modules 1 can be divided into two unit three-phase motors in turn, and each unit three-phase motor belongs to an independent sector 7. The independent sector includes a first-phase stator module 8 in a single independent sector, a second-phase stator module 9 in a single independent sector, and a third-phase stator module 10 in a single independent sector.

[0039] Example 4: Three-phase modular motor with phase magnetic separation capability

[0040] like Figure 4 As shown, a three-phase modular motor with phase magnetic isolation capability is an outer rotor inner stator motor, the modular motor includes a complete stator and a rotor 2, the complete stator is coaxially installed with the rotor 2, the complete stator is composed of fifteen stator modules 1 closely attached in sequence, and the difference from Example 1 is that when the complete stator is assembled, the stator teeth of the stator module are facing outward so that the stator teeth are opposite to the inner wall of the rotor when coaxially installed with the rotor; the stator module 1 includes a stator core, three stator teeth and a concentrated winding 3, the three stator teeth are the first stator tooth 4, the second stator tooth 5, and the third stator tooth 6 in sequence, a concentrated winding 3 is wound on the second stator tooth 5, the first stator tooth 4 and the third stator tooth 6 have the same width, and the width of the first stator tooth 4 and the third stator tooth 6 is inconsistent with the width of the second stator tooth 5. The magnetic flux generated by the armature winding on the second stator tooth 5 only passes through the stator module 1 where it is located, and does not pass through the second stator teeth of other stator modules 1, that is, it is not coupled with the armature windings on other stator modules 1, thereby achieving magnetic isolation and physical isolation between different stator modules 1.

[0041] like Figure 4 As shown, the modular motor is a three-phase motor. Starting from any stator module, every three stator modules constitute a unit three-phase motor, that is, fifteen stator modules can be divided into five unit three-phase motors in turn, and each unit three-phase motor belongs to an independent sector 7. The independent sector includes a first-phase stator module 8 in a single independent sector, a second-phase stator module 9 in a single independent sector, and a third-phase stator module 10 in a single independent sector.

[0042] The above are only four embodiments of the present invention. The embodiments of the present invention are not limited to the above four embodiments. Other embodiments made by those skilled in the art based on the inventive concept of the present invention all fall into the protection scope of the present invention.

Claims

1. Modular production of magnetic isolation motor, including coaxially mounted rotor and stator, characterized in that: The stator is composed of a plurality of stator modules. The stator core of each stator module is a three-tooth structure having a first stator tooth, a second stator tooth, and a third stator tooth. The second stator tooth is wound with a concentrated winding.

2. The modular manufacturing method of the magnetically isolated motor according to claim 1 is characterized in that: The first stator tooth and the third stator tooth have the same width.

3. The modular manufacturing method of the magnetically isolated motor according to claim 1 is characterized in that: The stator is composed of a plurality of stator modules which are closely attached to each other in sequence along the circumference.

4. The modular manufacturing method of magnetically isolated motor according to claim 1 is characterized in that: The stator is composed of a plurality of stator modules which are evenly distributed along a circumference without being close to each other, and the plurality of stator modules are fixed by external connecting members.

5. The modular manufacturing method of magnetically isolated motor according to claim 1 is characterized in that: When the modular motor is an outer rotor inner stator motor, the three-tooth structures of the stator cores of the multiple stator modules face radially outward and are opposite to the radially inner side of the rotor.

6. The modular manufacturing method of magnetically isolated motor according to claim 1, characterized in that: When the modular motor is an inner rotor and outer stator motor, the three-tooth structures of the stator cores of the multiple stator modules face radially inward and are opposite to the radially outer side of the rotor.

7. The modular manufacturing method of magnetically isolated motor according to claim 1, characterized in that: The concentrated windings wound on the second stator teeth of the stator cores of adjacent stator modules are wound in the same direction.

8. The modular manufacturing method of magnetically isolated motor according to claim 1, characterized in that: The directions in which the concentrated windings are wound on the second stator teeth of the stator cores of adjacent stator modules are different.

9. The modular manufacturing method of magnetically isolated motor according to claim 1, characterized in that: When the modular motor is an m-phase motor, m is an integer and m≥3. Starting from any stator module, every m stator modules constitute a unit m-phase motor, and the n stator modules are divided into k unit m-phase motors in turn. Each unit m-phase motor belongs to an independent sector, n=k*m, where k is the number of independent sectors, k is an integer and k≥1.

10. The modular manufacturing method of magnetically isolated motor according to claim 1, characterized in that: The modular motor is a surface mounted permanent magnet motor, an embedded permanent magnet motor or a switched reluctance motor.

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