Novel variable frequency motor structure

Abstract

The utility model discloses a novel variable frequency motor structure which is characterized in that a crankshaft sequentially penetrates through a shaft hole of a cylinder seat from top to bottom and is in interference fit with a mounting hole of a motor rotor, an inner ring of a motor stator is in interference fit with an outer circle of the shaft hole of the cylinder seat, and a plurality of vertically-through stator inner winding grooves are formed in the inner ring of the motor stator around the outer side of a stator inner hole; a stator outer winding groove is correspondingly formed outside each stator inner winding groove, the stator inner winding grooves are communicated with the corresponding stator outer winding grooves through circular openings, concave annular stator U grooves are formed in the bottom sides of final inspection of the motor stator inner winding grooves and the motor stator outer winding grooves, and the stator U grooves annularly penetrate through the circular openings. The novel variable frequency motor structure is simple and convenient to install and high in universality; the motor stator structure is high in silicon steel utilization rate, and adopts inner and outer double-layer winding grooves, thereby saving space and improving efficiency. By controlling the internal and external coaxiality of the shaft hole of the cylinder seat, the air gap of the motor is free of correction, and the labor cost is greatly reduced; the air cylinder seat of the structure does not need to be provided with machine legs, and cost of the compressor is reduced.

Description

Technical Field

[0001] This utility model relates to the field of variable frequency motor structure technology, and in particular to a novel variable frequency motor structure. Background Technology

[0002] A variable frequency motor is a type of synchronous motor whose speed is related to the power supply frequency. It employs an AC speed control method combining a dedicated variable frequency induction motor and a frequency converter, greatly improving the level of automation and production efficiency while also enabling equipment miniaturization. Depending on their working principle and application, variable frequency motors can be categorized into several types, such as three-phase asynchronous variable frequency motors, DC brushless variable frequency motors, AC brushless variable frequency motors, and switched reluctance variable frequency motors.

[0003] The existing methods for fixing the cylinder base and the stator of the variable frequency motor are all to install the cylinder base by passing screws through the screw holes of the motor stator, that is, by fixing it at 4 corners or 3 angles with screws.

[0004] This fixed installation method has the following disadvantages:

[0005] 1. Installation is relatively complicated and requires high screw strength;

[0006] 2. The motor stator that matches the cylinder base needs to be positioned during installation, which is not conducive to production efficiency;

[0007] 3. The cylinder mount requires additional material for the motor stator to accommodate screw holes during installation, thus increasing the cost of the cylinder mount and motor.

[0008] 4. The silicon steel structure of the motor requires more stator screw holes to fix the motor, which increases the demand for silicon steel and thus increases the cost.

[0009] In conclusion, it is necessary to design a new type of variable frequency motor structure to solve the above problems. Utility Model Content

[0010] The technical problem to be solved by this utility model is to address the issues of low production efficiency, high cost, and inconvenient installation caused by the use of screws to fix the cylinder base and motor stator of existing variable frequency motors. A new variable frequency motor structure is proposed.

[0011] To solve the above-mentioned technical problems, this utility model provides a novel variable frequency motor structure, including: a cylinder base, a crankshaft, a motor stator, and a motor rotor. The crankshaft passes through the shaft hole of the cylinder base, the stator inner hole of the motor stator, and the mounting hole of the motor rotor from top to bottom. The motor stator is made of silicon steel sheet, and multiple stator inner winding slots are spaced around the outer perimeter of the stator inner hole. Each stator inner winding slot has a corresponding stator outer winding slot. The stator inner winding slot and the corresponding stator outer winding slot are connected through a circular opening. A recessed annular stator U-groove is formed on the bottom side of the motor stator, and the stator U-groove passes through each circular opening in a circumferential direction.

[0012] In a preferred embodiment of this solution, the lower end of the cylinder seat is inserted into the inner hole of the stator, and is interference-fitted with the motor stator.

[0013] In a preferred embodiment of this scheme, there are 3N internal stator winding slots and 3N external stator winding slots, where N is an integer greater than 1.

[0014] Furthermore, the internal cross-section of the stator U-groove is square or trapezoidal.

[0015] In a preferred embodiment of this solution, the crankshaft and the motor rotor are interference-fitted in their mounting holes.

[0016] Furthermore, a ring of rotor magnets is provided around the top side of the motor rotor, and the rotor magnets are inserted into the stator U-slot opened at the bottom of the motor stator.

[0017] Furthermore, the rotor magnet is a one-piece molded ring or spliced ​​ring or spliced ​​regular polygonal structure.

[0018] Furthermore, multiple through holes are spaced apart on the bracket of the motor rotor around the mounting hole.

[0019] Implementing this utility model has the following beneficial effects:

[0020] This new type of variable frequency motor has a simple and convenient structure for installation and strong versatility; the stator structure of the motor has a high utilization rate of silicon steel, eliminating the need to prepare stator screw holes, and adopts inner and outer double-layer winding grooves, which saves space and improves efficiency.

[0021] The cylinder seat and stator are fitted together by the inner control of the stator and the outer circle of the cylinder seat shaft hole. The installation structure is simple and reduces the screw tightening installation process. By controlling the coaxiality of the inner and outer shaft holes of the cylinder seat, the air gap of the motor can be adjusted without calibration, which greatly reduces labor costs.

[0022] The cylinder seat of this structure does not require mounting feet, which greatly saves cylinder seat material and reduces the cost of the compressor. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an exploded structural diagram of a novel variable frequency motor.

[0025] Figure 2 This is a structural schematic diagram of a novel variable frequency motor.

[0026] Figure 3 A cross-sectional structural diagram of a novel variable frequency motor;

[0027] Figure 4 A top view of the motor stator structure;

[0028] Figure 5 A bottom view of the motor stator structure;

[0029] Figure 6 This is a schematic diagram of the motor rotor.

[0030] In the figure: cylinder seat 1, crankshaft 2, motor stator 3, motor rotor 4, shaft hole 5, stator inner hole 6, mounting hole 7, stator inner winding slot 8, stator outer winding slot 9, circular opening 10, stator U-slot 11, rotor magnet 12, bracket 13, and through hole 14. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figure 1-3 , Figure 1 This is an exploded structural diagram of a novel variable frequency motor. Figure 2 This is a structural schematic diagram of a novel variable frequency motor. Figure 3 This is a cross-sectional view of a novel variable frequency motor structure; the novel variable frequency motor structure includes: cylinder base 1, crankshaft 2, motor stator 3 and motor rotor 4.

[0033] The crankshaft 2 passes through the shaft hole 5 of the cylinder seat 1, the stator inner hole 6 of the motor stator 3, and the mounting hole 7 of the motor rotor 4 from top to bottom.

[0034] Specifically, the lower end of the cylinder seat 1 is inserted into the stator inner hole 6 and is interference-fitted with the motor stator 3, and the crankshaft 2 is interference-fitted with the mounting hole 7 of the motor rotor 4.

[0035] The motor stator 3 is made of silicon steel sheet, with multiple through-holes 8 spaced around the outer perimeter of the stator inner hole 6. Each inner winding slot 8 has a corresponding outer winding slot 9. The inner winding slots 8 and their corresponding outer winding slots 9 are connected by a circular opening 10, which facilitates needle threading for the winding equipment. Please refer to [link to relevant documentation]. Figure 4 , Figure 4 This is a top view of the motor stator. There are 3N internal winding slots (8) and 3N external winding slots (9) in the stator, where N is an integer greater than 1, such as 6, 9, or 12.

[0036] The bottom side of the motor stator 3 is provided with a recessed annular stator U-groove 11, which circumferentially passes through each circular opening 10. Please refer to [link to relevant documentation]. Figure 5 , Figure 5 This is a bottom view of the motor stator. In this embodiment, the inner cross-section of the stator U-slot 11 is square or trapezoidal.

[0037] A ring of rotor magnets 12 is provided around the top outer side of the motor rotor 4. The rotor magnets 12 are inserted into the stator U-slot 11 opened on the bottom end of the motor stator 3. Please refer to [link to relevant documentation]. Figure 6 , Figure 6 This is a schematic diagram of the motor rotor. The rotor magnet 12 is a one-piece ring or spliced ​​ring or spliced ​​regular polygon structure. Multiple through holes 14 are spaced apart on the bracket 13 of the motor rotor 4 around the mounting hole 7.

[0038] This utility model presents a novel variable frequency motor structure that is simple, quick to install, and highly versatile. During installation, no screws are required between the cylinder seat and the motor stator; installation is achieved simply by aligning the inner hole of the stator with the outer circle of the cylinder seat shaft hole. By controlling the coaxiality of the inner and outer shaft holes of the cylinder seat, the air gap of the motor is eliminated, reducing labor costs.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel variable frequency motor structure, characterized in that, include: The motor comprises a cylinder block, a crankshaft, a motor stator, and a motor rotor. The crankshaft passes sequentially from top to bottom through the shaft hole of the cylinder block, the stator inner hole of the motor stator, and the mounting hole of the motor rotor. The motor stator has multiple vertically penetrating internal winding slots spaced around the outer perimeter of the stator inner hole. Each internal winding slot has a corresponding external winding slot. The internal winding slots and the corresponding external winding slots are connected by circular openings. A recessed annular stator U-groove is formed on the bottom side of the internal and external winding slots of the motor stator, and the stator U-groove circumferentially penetrates each of the circular openings.

2. The novel variable frequency motor structure according to claim 1, characterized in that, The lower end of the cylinder seat is inserted into the inner hole of the stator, and is interference-fitted with the motor stator.

3. The novel variable frequency motor structure according to claim 1, characterized in that, Both the inner and outer winding slots of the stator are 3N in number, where N is an integer greater than 1.

4. The novel variable frequency motor structure according to claim 3, characterized in that, The inner cross-section of the stator U-groove is square or trapezoidal.

5. The novel variable frequency motor structure according to claim 1, characterized in that, The crankshaft is interference-fitted with the mounting hole of the motor rotor.

6. The novel variable frequency motor structure according to claim 5, characterized in that, A ring of rotor magnets is provided around the top side of the motor rotor, and the rotor magnets are inserted into the stator U-slot opened at the bottom of the motor stator.

7. The novel variable frequency motor structure according to claim 6, characterized in that, The rotor magnet is a one-piece formed ring or a spliced ​​ring or a spliced ​​regular polygon structure.

8. The novel variable frequency motor structure according to claim 7, characterized in that, Multiple through holes are spaced apart on the bracket of the motor rotor around the mounting hole.

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