JP3240303U - Low Vibration Variable Frequency Permanent Magnet Motor Stamping Sheet for Air Cooling System - Google Patents

Abstract

A low vibration variable frequency permanent magnet motor stamping sheet for an air cooling system. A low vibration variable frequency permanent magnet motor stamping sheet for an air cooling system includes a stator stamping sheet and a rotor stamping sheet, the outer periphery of the stator stamping sheet being fixedly connected to the inner periphery of the motor housing, The rotor punching seat and the motor rotating shaft are connected by an interference fit, an air gap is provided between the inner circumference of the stator punching seat and the outer circumference of the rotor punching seat, and the inner circumference of the stator punching seat has a plurality of fixing The child teeth are arranged evenly, tooth grooves are provided between the teeth of both adjacent stator teeth, notch projections are provided on both ends of the upper teeth of the stator, and the adjacent teeth on both adjacent stator teeth are provided. Both notch protrusions form one notch, both dummy slots are provided on the upper part of the teeth of the stator, and a plurality of salient pole arc-shaped magnetic poles are evenly provided on the outer periphery of the rotor punching sheet, and both adjacent Interpolar dividing grooves are evenly provided between the magnetic poles. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to the field of permanent magnet motor technology, and more particularly to low vibration variable frequency permanent magnet motor stamping sheets for air cooling systems.

The variable frequency permanent magnet direct drive motor for the air cooling system is a dedicated drive device with energy saving improvements to the air cooling system, which has the advantages of high efficiency, energy saving, easy transmission and maintenance free. In such a motor, the stator, rotor, and air gap between the stator and rotor form a magnetic circuit, and electromagnetic force rotates the rotating shaft of the motor. At this time, the instantaneous output torque of the motor changes continuously, but sometimes fluctuates around a constant average value, and this phenomenon is called torque pulsation.

Most variable frequency permanent magnet direct drive motors dedicated to existing air cooling systems experience torque pulsation, which causes the motor to drag the load and cause vibrations, affecting the bridge stability of the improved air cooling system. , pose a safety risk. Therefore, it is necessary to reduce the torque pulsation of the motor and further reduce the vibration of the motor itself. In view of this, the inventors provide a low vibration variable frequency permanent magnet motor stamping sheet for air cooling system to solve the above problems.

The purpose of this invention is to solve the problem that the torque pulsation of the variable frequency permanent magnet direct drive motor dedicated to the conventional air cooling system causes a large vibration in the motor, and the bridge of the improved air cooling system becomes unstable, creating a safety risk. It is about solving problems.

In order to achieve the above objectives, the basic solution of the present invention includes a stator punching sheet and a rotor punching sheet that can be fitted into the inner opening of the stator punching sheet, wherein the stator punching sheet The outer periphery is fixedly connected to the inner periphery of the motor housing, the rotor stamping seat and the rotating shaft of the motor are connected by an interference fit, and an air gap is formed between the inner periphery of the stator stamping seat and the outer periphery of the rotor stamping seat. A plurality of stator teeth are evenly provided on the inner periphery of the rotor punched sheet, and tooth grooves are provided for arranging the stator windings between two adjacent stator teeth. are provided with notch projections on both ends of the top of the stator teeth, two adjacent notch projections on two adjacent teeth of the stator form one notch, and two A variable low-vibration system for air-cooling systems in which dummy slots are provided, a plurality of arc-shaped salient magnetic poles are evenly provided on the outer circumference of the rotor punched sheet, and inter-polar dividing grooves are evenly provided between two adjacent magnetic poles. To provide a frequency permanent magnet motor stamping sheet.

The principle and effect of this basic solution are as follows.

1. The present invention reduces the uneven distribution of the magnetic field caused by slotting directly into the stamping sheet of the stator by installing dummy slots on the top of the teeth of the stator, and reduces the torque in the tooth spaces. further reduce electromagnetic vibration and noise, and reduce torque ripple in the tooth space.

2. The present invention makes the magnetic poles on the outer periphery of the rotor punching sheet have a salient arc shape, so that the magnetic poles of the rotor punching sheet achieve the salient pole effect. As a result, it is possible to optimize the harmonic components of the motor, reduce electromagnetic vibration and electromagnetic noise, and further reduce torque pulsation.

3. The present invention installs inter-pole dividing grooves between the magnetic poles on the outer periphery of the rotor punching sheet to prevent magnetic leakage of the permanent magnets, reduce raw material consumption and manufacturing costs, The magnetic field of each pole can also be more concentrated to reduce motor harmonic content and harmonic losses.

4. Compared with the prior art, the present invention has dummy slots to reduce the magnetic field non-uniformity caused by slotting the stator directly, effectively reducing the tooth space torque. In addition, the dummy slots and salient arc-shaped magnetic poles reduce electromagnetic vibration and noise, and reduce torque pulsation. By installing the inter-pole dividing grooves between the magnetic poles, it saves the manufacturing cost and reduces the harmonic component and harmonic loss of the motor. This solves the problem that the torque pulsation of the variable frequency permanent magnet direct drive motor dedicated to the conventional air cooling system causes a large vibration in the motor, and the bridge of the improved air cooling system becomes unstable, which poses a safety risk. do.

Further, the upper portion of the stator tooth is arc-shaped. Arc-shaped tops of the stator teeth reduce salient pole effect errors caused by air gap eccentricity due to machining and the presence of bearing clearances.

Further, A is the height difference between the highest point and the lowest point of the arc, B is the length of the air gap, and C is the height of the notch protrusion, where 0≤A/C≤0.5B. By setting the tooth arc shape to an adjustment range suitable for variable frequency motors dedicated to air cooling systems, it is possible to further reduce the non-uniformity of the air gap magnetic field due to the eccentricity of the air gap and ensure the stability of the motor operation. can.

Further, the width of the dummy slot is D, the depth of the dummy slot is E, and the width of the notch is F, where D=0.75F and E=0.75C. By setting the width and depth of the dummy slot to 0.75 times that of the notch, the magnetic field distribution in the variable frequency motor dedicated to the air cooling system is made more uniform, reducing torque pulsation due to tooth gaps and further reducing vibration. .

Further, the difference in altitude between the highest point and the lowest point of the arc-shaped magnetic poles is G, where G=0.7B. By setting the height difference of the salient pole arc shape of the magnetic pole to 0.7 times the length of the air gap, the salient pole effect of the variable frequency motor suitable for the air cooling system is formed, and the harmonic component of the motor is optimized. , to reduce the electromagnetic vibration and noise generated by the motor.

Furthermore, welded rib grooves are provided on the outer circumference of the stator punched sheet to facilitate lamination of the stator punched sheet to the iron core of the stator. By providing the welded rib grooves, it becomes easier to stack a plurality of stamped stator sheets on the stator core.

To describe the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings used in the description of the embodiments. Of course, the drawings in the following description are just some embodiments of the present invention, and those skilled in the art can also obtain other drawings from these drawings without creative efforts.

1 is an assembly diagram of a low vibration variable frequency permanent magnet motor stamping sheet for an air cooling system provided by an embodiment of the present invention; FIG. 1 is a schematic view of a stator stamping sheet of a low vibration variable frequency permanent magnet motor stamping sheet for an air cooling system provided by an embodiment of the present invention; FIG. 1 is a schematic diagram of a rotor stamping sheet of a low vibration variable frequency permanent magnet motor stamping sheet for an air cooling system provided by an embodiment of the present invention; FIG.

In order to further describe the technical means and effects adopted to achieve the intended purpose of the present invention, the specific embodiments, structures, Features and effects are described in detail.

A low vibration variable frequency permanent magnet motor stamping sheet for an air cooling system comprises a stator stamping sheet 1 and a rotor stamping sheet 2 which can be fitted into an inner opening of the stator stamping sheet 1, as shown in FIG. The outer periphery of the stamped stator sheet 1 is fixedly connected to the inner periphery of the motor housing, and the outer periphery of the stamped stator sheet 1 is provided with a welding rib groove 3 used for connection with the housing of the motor. , the rotor punching sheet 2 and the rotating shaft of the motor are connected by interference fit,
An air gap 4 is provided between the inner circumference of the stator punched sheet 1 and the outer circumference of the rotor punched sheet 2, and the air gap 4 between the inner circumference of the stator punched sheet 1 and the outer circumference of the rotor punched sheet 2. is of length B. As shown in FIG. 2, the inner circumference of the stator punching sheet is provided with stator teeth 5 for arranging the stator windings. The height difference between the point and the lowest point is A, a tooth groove 6 is provided between two adjacent stator teeth 5, and notch projections 7 are provided at both ends of the upper portion of the stator tooth 5, and the notch The height of the protrusion 7 is C, where 0≤A/C≤0.5B. Two adjacent notch protrusions 7 on two adjacent stator teeth 5 form one notch 8, the width of the notch 8 is F, and two dummy slots 9 are provided on the top of the stator tooth 5. The width of the dummy slot 9 is D and the depth of the dummy slot 9 is E, where D=0.75F and E=0.75C. As shown in FIG. 3, 40 salient arc-shaped magnetic poles 10 are evenly provided on the outer periphery of the rotor punching sheet 2, and the number of the salient arc-shaped magnetic poles 10 is the same as the number of motor poles. The magnetic pole 10 is composed of a permanent magnet, and the height difference between the highest point and the lowest point of the salient arc-shaped magnetic pole 10 is G, and G=0.7B at this time. Further, inter-polar dividing grooves 11 are evenly provided between two adjacent magnetic poles 10 .

In the specific implementation of the present invention, the stator punching sheet 1 and the rotor punching sheet 2 are stacked one by one on the stator core and the rotor core according to the designed length respectively, and then the stator The core of the rotor and the core of the rotor are installed in the housing of the motor and on the rotating shaft of the motor. When the machine operates, the stator windings are energized to produce a rotating magnetic field, the interaction between the permanent magnets on the magnetic poles 10 and the stator core produces electromagnetic torque, and the rotor core is Rotate, that is, realize the rotation of the motor. By setting the characteristics of the stamped stator sheet 1 and the stamped rotor sheet 2, the output of the improved variable frequency motor dedicated to the air cooling system is smoothed, torque pulsation is greatly reduced, and electromagnetic vibration and electromagnetic noise are also reduced.

Compared with the prior art, the present invention makes the upper part of the stator teeth 5 in a circular arc shape, so that the nonuniformity of the air gap magnetic field caused by the eccentricity of the air gap 4 caused by the machining and the presence of the bearing clearance reduce sexuality. The dummy slot 9 is installed to effectively reduce the torque of the tooth space 6, the inter-polar dividing groove 11 is installed between the magnetic poles 10 to save the manufacturing cost, and the motor harmonic component and harmonic loss are reduced. Decrease. By setting the parameters of the relevant characteristics of the dummy slot 9, the salient pole arc-shaped magnetic pole 10 and the upper arc-shaped stator tooth 5, the characteristics of the variable frequency motor dedicated to the air cooling system can be formed, and the electromagnetic vibration and noise can be reduced. reduce torque pulsation, the torque pulsation of variable frequency permanent magnet direct drive motors dedicated to conventional air cooling systems will cause large vibrations in the motor, causing the air cooling system bridge to become unstable and present a safety risk Solve a problem.

The above description is only a preferred embodiment of the invention and is not intended to limit the invention in any way. not something to do. Those skilled in the art can utilize the above-disclosed technical content to make some changes or modifications to the equivalent implementations of the equivalent changes without departing from the scope of the technical solution of the present invention. However, all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the technical solution of the present invention still remain within the scope of the present invention. Belong to the scope of technical solutions.

REFERENCE SIGNS LIST 1 stator punched sheet 2 rotor punched sheet 3 welded rib groove 4 air gap 5 stator tooth 6 tooth groove 7 notch projection 8 notch 9 dummy slot 10 magnetic pole 11 inter-polar division groove

Claims (6)

a stator punching sheet and a rotor punching sheet that can be fitted into the inner opening of the stator punching sheet, the outer circumference of the stator punching sheet is fixedly connected to the inner circumference of the motor housing, and the rotor The punched sheet and the rotating shaft of the motor are connected by an interference fit, an air gap is provided between the inner circumference of the stator punched sheet and the outer circumference of the rotor punched sheet, and a plurality of air gaps are provided on the inner circumference of the rotor punched sheet. The stator teeth are evenly provided, tooth spaces are provided for arranging the stator windings between two adjacent stator teeth, and notches are provided at both ends of the upper portion of the stator teeth. A protrusion is provided, two adjacent notch protrusions on two adjacent stator teeth form one notch, two dummy slots are provided on the top of the stator tooth, and the rotor punching sheet A low-vibration variable-frequency permanent magnet motor for air-cooling systems characterized in that a plurality of salient pole arc-shaped magnetic poles are evenly provided on the outer circumference of the motor, and inter-polar dividing grooves are evenly provided between two adjacent magnetic poles. sheet. 2. The low vibration variable frequency permanent magnet motor stamping sheet for air cooling system of claim 1, wherein the upper portion of the teeth of the stator is arc-shaped. The height difference between the highest point and the lowest point of the arc is A, the length of the air gap is B, and the height of the notch projection is C, where 0≤A/C≤0.5B. The low vibration variable frequency permanent magnet motor stamping sheet for air cooling system according to claim 2, characterized in that. 3. The width of the dummy slot is D, the depth of the dummy slot is E, and the width of the notch is F, where D=0.75F and E=0.75C. A low vibration variable frequency permanent magnet motor stamped sheet for an air cooling system according to claim 1. 5. The low vibration variable frequency for air cooling system according to claim 4, wherein the height difference between the highest point and the lowest point of the arc-shaped magnetic pole is G, and G=0.7B. Permanent magnet motor punching sheet. 2. Low vibration variable frequency for air cooling system according to claim 1, characterized in that the outer periphery of the stator stamping sheet is provided with weld rib grooves for facilitating lamination of the stator stamping sheet to the iron core of the stator. Permanent magnet motor punching sheet.

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