CN111211643A

CN111211643A - Anti-electromagnetic interference motor and manufacturing method thereof

Info

Publication number: CN111211643A
Application number: CN201811389584.0A
Authority: CN
Inventors: 王鸿磊
Original assignee: Changzhou Chengxin Investment Partnership (limited Partnership)
Current assignee: Changzhou Chengxin Investment Partnership (limited Partnership)
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2020-05-29

Abstract

An anti-electromagnetic interference motor comprises a rotor, a motor driving device and a motor control device, wherein the rotor comprises a rotating shaft, a coil assembly arranged on the rotating shaft and a steering assembly arranged at the top end of the rotating shaft; a stator including a housing, an end cap at a top end of the housing, and a mounting cavity formed in the housing, the rotor being rotatably mounted in the mounting cavity, the stator further including a first brush assembly and a second brush assembly disposed inside the end cap and contacting the steering assembly, and a first terminal and a second terminal extending outwardly from an outside of the end cap; and the anti-electromagnetic interference electronic assembly comprises a first voltage dependent resistor arranged on the steering assembly, a second voltage dependent resistor arranged on the outer side of the end cover and an inductance-capacitance assembly arranged on the inner side of the end cover.

Description

Anti-electromagnetic interference motor and manufacturing method thereof

Technical Field

The invention relates to the field of motors, in particular to an anti-electromagnetic interference motor and a manufacturing method thereof.

Background

The motor is an electromagnetic device for realizing electric energy conversion or transmission according to the electromagnetic induction law, and mainly has the function of generating driving torque as a power source of electric appliances or various machines. The motor may be classified into a direct current motor and an alternating current motor according to the kind of the operating power source. Motors have found widespread use in various areas of life.

Because the operation of the motor is realized by means of mutual conversion and interaction between electromagnetism, electromagnetic interference can be inevitably generated on peripheral electromagnetic components during the operation of the motor. When the intensity of electromagnetic interference generated by the work of the motor is large, the work of peripheral electromagnetic components and equipment is seriously influenced, the operation of the peripheral electromagnetic components is influenced, and even more, the peripheral electromagnetic components are damaged.

On the other hand, the peripheral electromagnetic components in the environment where the motor is applied can also generate electromagnetic interference on the motor in the same way, and when the electromagnetic interference generated by the electromagnetic components in the external environment where the motor is located reaches a certain degree, the motor can be greatly influenced, and even the motor can be damaged.

Therefore, the electromagnetic compatibility (emc) of the motor is an important consideration for measuring the performance of the motor. EMC includes two requirements: on one hand, the electromagnetic interference generated by the equipment to the environment in the normal operation process cannot exceed a certain limit; on the other hand, the equipment has a certain degree of immunity to electromagnetic interference existing in the environment where the equipment is located, and can work normally by resisting the electromagnetic interference in the external environment.

Therefore, how to improve the electromagnetic compatibility of the motor, reduce the electromagnetic interference generated by the electromagnetic components in the external environment when the motor works, and improve the capability of the motor to resist the external electromagnetic interference becomes a technical problem which restricts the development of the motor and needs to be solved urgently.

On the other hand, the existing motor is often provided with some inductors and capacitors inside an end cover of the motor so as to improve the electromagnetic compatibility of the motor, but the design needs to occupy a large amount of internal space of the motor, so that the volume of the motor is increased, and the application range of the motor is affected.

On the other hand, in a conventional motor, an annular piezoresistor is often arranged at one end of a motor converter close to a coil, so that the anti-electromagnetic interference capability of the motor and the capability of generating electromagnetic interference on external electromagnetic components are improved. However, in the conventional motor design, the ring resistor is usually welded directly to the hook of the steering gear, and the spot welding connection between the ring resistor and the ring resistor not only has the function of supporting the ring resistor to the hook, but also has the function of electrically connecting the ring resistor to the hook. However, in the actual use process of the motor, the connection between the ring resistor and the hook is easily broken under the action of the gravity of the ring resistor and the external impact force, so that the electrical connection between the ring resistor and the hook is broken, and the normal use of the motor is further affected.

Most importantly, when the motor is used in different use environments, the electromagnetic interference strength generated by environmental elements in different environments is not passed, and the maximum electromagnetic interference that can be borne by the electromagnetic components is different, so that how to select the electronic components designed by the anti-electromagnetic interference circuit is important.

In summary, how to improve the electromagnetic compatibility of the motor, reduce the overall volume of the motor, and increase the stability of the connection relationship between the ring resistor and the converter becomes a technical problem to be solved urgently for restricting the further development and application of the motor.

Disclosure of Invention

An object of the present invention is to provide an anti-electromagnetic interference motor which generates less electromagnetic interference when operating, as compared with a conventional motor, and a method of manufacturing the same.

Another object of the present invention is to provide an anti-electromagnetic interference motor and a method for manufacturing the same, which has a smaller space volume, is convenient to use, and has a wide application range compared to the conventional motor.

Another object of the present invention is to provide an anti-electromagnetic interference motor and a method of manufacturing the same, in which an internal link structure of the anti-electromagnetic interference motor is stable, and the anti-electromagnetic interference motor operates more stably than a conventional motor.

Another objective of the present invention is to provide an anti-electromagnetic interference motor and a manufacturing method thereof, wherein a plastic package assembly is filled between the coils of the annular piezoresistor of the anti-electromagnetic interference motor, and the plastic package assembly can support the annular piezoresistor, thereby improving the stability of the internal structure of the motor.

Another object of the present invention is to provide an anti-electromagnetic interference motor and a method for manufacturing the same, wherein a plastic package assembly is wrapped at a connection portion between a coil of a rotor of the motor and a hook of a steering gear, and the plastic package assembly can improve the stability of connection between an end portion of the coil and the hook.

Another object of the present invention is to provide an anti-electromagnetic interference motor and a method for manufacturing the same, in which a brush of the motor has high conductivity and can reduce the intensity of electromagnetic interference caused by friction with a steering gear.

Another object of the present invention is to provide an anti-electromagnetic interference motor and a manufacturing method thereof, wherein a second voltage dependent resistor of the motor is disposed outside the end cover, so as to reduce the occupied internal space of the motor and reduce the overall size of the motor.

Another object of the present invention is to provide an anti-electromagnetic interference motor and a manufacturing method thereof, wherein a second varistor of the motor is disposed on an outer side of a motor end cover, and the second varistor is in direct contact with outside air, so that heat dissipation efficiency of the second varistor can be improved.

Another object of the present invention is to provide an anti-electromagnetic interference motor and a manufacturing method thereof, wherein the second varistor is disposed on the outer side of the motor end cover, which can facilitate the installation of the second varistor.

Another object of the present invention is to provide an anti-electromagnetic interference motor and a method for manufacturing the same, which has a simple structure, a simple manufacturing process, and a low cost.

Accordingly, to achieve at least one of the above objects, the present invention provides an anti-electromagnetic interference motor, including:

the rotor comprises a rotating shaft, a coil assembly arranged on the rotating shaft and a steering assembly arranged at the top end of the rotating shaft;

a stator including a housing, an end cap at a top end of the housing, and a mounting cavity formed in the housing, the rotor being rotatably mounted in the mounting cavity, the stator further including a first brush assembly and a second brush assembly disposed inside the end cap and contacting the steering assembly, and a first terminal and a second terminal extending outwardly from an outside of the end cap; and

an anti-electromagnetic interference electronic assembly, it includes being located turn to a first piezo-resistor of subassembly, being located a second piezo-resistor of end cover outside and being located an inductance capacitance subassembly of end cover inboard.

According to an embodiment of the present invention, the anti-electromagnetic interference motor further includes a plastic package assembly, and the plastic package assembly is disposed between the top surface of the coil assembly and the bottom surface of the first varistor.

According to one embodiment of the invention, the joint between two ends of a coil of the coil assembly and a group of hooks of the steering assembly is wrapped by the plastic package assembly.

According to one embodiment of the invention, the plastic encapsulation assembly is implemented as an epoxy resin.

According to an embodiment of the present invention, the inductor-capacitor assembly includes a first capacitor, a second capacitor, a third capacitor, a first inductor, and a second inductor, wherein the first inductor is electrically connected to the first connection tab and the first brush assembly, the second inductor is electrically connected to the second connection tab and the second brush assembly, the first capacitor is electrically connected to the first connection tab and the second connection tab, the second capacitor is electrically connected to the first connection tab and the housing, and the third capacitor is electrically connected to the second connection tab and the housing.

According to an embodiment of the present invention, the two press legs of the second varistor are electrically connected to the first and second tabs, respectively.

According to an embodiment of the invention, the capacitance value of the first capacitor ranges from 1 picofarad (pF) to 1 farad (F); the capacitance value of the second capacitor ranges from 1 picofarad (pF) to 400000 picofarads (pF); the capacitance value of the third capacitor ranges from 1 picofarad (pF) to 400000 picofarads (pF); the inductance value of the first inductor ranges from 1 microHenry (mH) to 1 Henry (H); the inductance value of the second inductor ranges from 1 microHenry (mH) to 1 Henry (H); the resistance value range of the second piezoresistor is 1 ohm (omega) to 1000 ohm (omega).

According to one embodiment of the invention, the second varistor model is 07K20, wherein the first inductor and the second inductor have a size of 4.5uH, the second capacitor and the third capacitor have a size of 10000pf (63V), and the first capacitor has a size of 470000pf (63V).

According to one embodiment of the present invention, the first brush piece and the second brush piece respectively include a connecting piece and a brush member provided at a movable end of the connecting piece.

According to one embodiment of the invention, the brush is made of copper powder and carbon powder.

According to one embodiment of the invention, the copper powder content of the brush element is 50% to 60%.

According to another aspect of the present invention, the present invention further provides an anti-electromagnetic interference motor, comprising:

the rotor comprises a rotating shaft, a coil assembly arranged on the rotating shaft, a steering assembly arranged at the top end of the rotating shaft and a first piezoresistor arranged at one end, close to the coil assembly, of the steering assembly;

and the plastic package assembly is arranged between the first piezoresistor and the coil gradually and is contacted with the top end of the coil assembly and the bottom end of the first piezoresistor.

According to one embodiment of the invention, the plastic package assembly wraps the connection between two ends of a coil of the coil assembly and a group of hooks of the steering gear.

According to one embodiment of the invention, the first varistor is implemented as a ring varistor.

According to another aspect of the present invention, the present invention further provides a method of assembling an end cap assembly of a tamper resistant motor, wherein the method comprises the steps of:

step 101: fixing a bearing at the inner side of an end cover;

step 102: mounting two brush sheet assemblies at the inner end of the end cover;

step 103: mounting two lugs on the outer side of the end cover; and

step 104: and installing an anti-electromagnetic interference electronic component on the end cover.

According to a preferred embodiment of the present invention, the step 104 further comprises the following steps:

step 1041: installing an inductance-capacitance component on the inner side of the end cover; and

1042, installing a second varistor assembly outside the end cap, and electrically connecting two ends of the second varistor assembly to the two connection plates respectively

According to an embodiment of the present invention, the step 1041 further includes the following steps:

step 10411: installing a first inductor and a second inductor on the inner side of the end cover, and enabling two ends of the first inductor to be electrically connected to one brush piece assembly and a first wiring piece respectively, and two ends of the second inductor to be electrically connected to the other brush piece assembly and a second wiring piece respectively; and

step 10412: and installing a first capacitor, a second capacitor and a third capacitor on the inner side of the end cover, wherein two ends of the first capacitor are electrically connected to the first lug plate and the second lug plate respectively, two ends of the second capacitor are electrically connected to one brush piece assembly and the end cover respectively, and two ends of the third capacitor are electrically connected to the other brush piece assembly and the end cover respectively.

According to another aspect of the present invention, the present invention further provides a method for assembling a stator of a tamper resistant electric machine, wherein the method comprises the steps of:

step 201: mounting a coil assembly on a rotating shaft;

step 202: installing a steering gear with a first piezoresistor on the rotating shaft; and

step 203: and a plastic package assembly is filled between the top surface of a coil of the coil assembly and the bottom surface of the first piezoresistor.

According to one embodiment of the invention, the plastic package assembly is wrapped at the joint between the end of the coil and a hook of the steering gear.

According to another aspect of the present invention, the present invention further provides a method of assembling a tamper resistant electric machine, wherein the method comprises the steps of:

step 301: mounting a rotor in a mounting cavity of a housing; and

step 302: and mounting a cover assembly on the top end of the shell.

According to an embodiment of the present invention, the step 301 further comprises the following steps:

step 3011: mounting a coil assembly on a rotating shaft;

step 3012: installing a steering gear with a first piezoresistor on the rotating shaft; and

step 3013: and a plastic package assembly is filled between the top surface of a coil of the coil assembly and the bottom surface of the first piezoresistor.

According to an embodiment of the present invention, the step 302 further comprises the following steps:

step 3021: fixing a bearing at the inner side of an end cover;

step 3022: mounting two brush sheet assemblies at the inner end of the end cover;

step 3023: mounting two lugs on the outer side of the end cover; and

step 3024: and installing an anti-electromagnetic interference electronic component on the end cover.

Drawings

Fig. 1A and 1B are schematic views of the overall structure of an electromagnetic interference resistance motor according to a preferred embodiment of the present invention.

Fig. 2 is an exploded view of an anti-electromagnetic interference motor according to a preferred embodiment of the present invention.

Fig. 3 is a schematic front structural view of an end cover of an anti-electromagnetic interference motor according to a preferred embodiment of the present invention.

Fig. 4 is a schematic diagram of a back structure of an end cover of an anti-electromagnetic interference motor according to a preferred embodiment of the invention.

Fig. 5A and 5B are schematic structural views of a housing of an electromagnetic interference resistant motor according to a preferred embodiment of the present invention.

Fig. 6A and 6B are schematic views of the overall structure of a rotor of an electromagnetic interference resistant motor according to a preferred embodiment of the present invention.

Fig. 7A and 7B are schematic cross-sectional structural views of an electromagnetic interference resistant motor according to a preferred embodiment of the present invention.

Fig. 8 is a partially enlarged structural view of an anti-motor according to a preferred embodiment of the present invention.

Fig. 9 is a schematic diagram of an anti-electromagnetic interference circuit structure according to a preferred embodiment of the present invention.

Fig. 10 is a block diagram illustrating an assembly process of a stator of an anti-electromagnetic interference motor according to a preferred embodiment of the present invention.

Fig. 11 is a block diagram illustrating an assembly process of a rotor of an anti-electromagnetic interference motor according to a preferred embodiment of the present invention.

Fig. 12 is a block diagram illustrating an assembly process of an anti-electromagnetic interference motor according to a preferred embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Referring to fig. 1A to 12, an anti-electromagnetic interference motor provided by the present invention is illustrated. The anti-electromagnetic interference motor includes a stator 10, a rotor 20, and an anti-electromagnetic interference electronic component 30. The rotor 20 is rotatably mounted to the stator 10, and the anti-electromagnetic interference electronic component 30 is configured to suppress electromagnetic waves generated when the rotor 20 rotates in the stator 10, so as to reduce electromagnetic interference.

Referring to fig. 6A and 6B, the stator 10 further includes a housing 11 and an end cap 12, and has a mounting cavity 13 formed in the housing 11 and a mounting cavity opening 131 communicating with the mounting cavity 13. The end cap 12 is detachably connected to the housing 11, and the end cap 12 can cover the mounting cavity opening 131. The rotor 20 is rotatably mounted in the mounting cavity 13 of the housing 11.

The rotor 20 further includes a rotating shaft 21, a coil assembly 22 disposed on the rotating shaft 21, and a steering gear 23 disposed on the rotating shaft 21. The rotating shaft 21 is rotatably installed in the installation cavity 13 of the stator 10, and the coil block 22 and the deflector 23 can rotate in the installation cavity 13 of the stator 10 in accordance with the rotation of the rotating shaft 21.

Specifically, the rotating shaft 21 further includes a driving end 211 and a connecting end 212. When the rotating shaft 21 is installed in the installation cavity 13 of the stator 10, the driving end 211 of the rotating shaft 21 extends outwards through the bottom end of the housing 11, and the connecting end 212 of the rotating shaft 21 is in rotatable contact with the end cover 12 of the stator 10.

The coil assembly 22 further includes a mounting core 221 and a set of coils 222 that are wound around the mounting core 221 in a certain order. The mounting core 221 is mounted on the rotating shaft 21, and the rotating shaft 21 can drive the mounting core 221 and the coil 222 arranged on the mounting core 221 to rotate in the mounting cavity 13.

The mounting core 221 further includes a set of connecting blocks 2211 and has a through hole 2212. The connecting blocks 2211 surround the through holes 2212, the through holes 2212 are located at the center of the connecting blocks 2212, and a certain gap is formed between the outer sides of each connecting block 2212. The through hole 2212 has a shape and size corresponding to those of the rotation shaft 21, and the rotation shaft 21 is fitted into the through hole 2212.

Preferably, the number of the connection blocks 2211 of the installation core 221 is implemented as a base block, and the number of the connection blocks 2211 is implemented as five blocks in the present preferred embodiment. It will be appreciated by those skilled in the art that in other preferred embodiments of the present invention, the number of attached connection blocks 2211 of the mounting core 221 may also be implemented as three, seven, nine or other base number blocks. The number of the connection blocks 2211 of the mounting core 221 should not be construed as a limitation of the present invention as long as the object of the present invention can be achieved.

Preferably, the connecting blocks 2211 of the mounting core 221 are each implemented as a silicon steel sheet. It should be understood by those skilled in the art that the connection block 2211 of the mounting core 221 may also be implemented as other magnetic materials, such as but not limited to ru fe — b magnetic material.

In the preferred embodiment, the mounting core 221 is detachably mounted to the rotating shaft 21, and in other embodiments of the present invention, the mounting core 221 may be integrally connected to the rotating shaft 21.

The steering gear 23 is provided at the connection end 212 of the rotating shaft 21. The diverter 23 further includes a diverter body 231, a set of diverter blades 232 mounted to the diverter body 231, and a set of hooks 233. The deflector 23 further has a mounting hole 234 formed in the deflector body 231, the mounting hole 234 penetrating the deflector body 231 in the longitudinal direction of the deflector body 231.

The number of the hooks 233 is equal to the number of the turning pieces 232, and each of the hooks 233 is electrically connected to one of the turning pieces 232. The end of the coil 222 of the coil block 22 is electrically connected to the hook 233.

The connecting end 212 of the rotating shaft 21 passes through the mounting hole 234 of the steering gear 23, and the connecting end 212 of the rotating shaft 21 protrudes out of the top end of the steering gear body 231, so that the connecting end 212 of the rotating shaft 21 can contact with the end cover 12 of the stator 10 to position the rotating shaft 21.

The anti-electromagnetic interference electronic component 30 further comprises a first voltage dependent resistor 31. The first varistor 31 is disposed at an end of the deflector 23 of the rotor 20 near the coil block 22. Preferably, the first varistor 31 is implemented as an annular varistor.

The first varistor 31 implemented as an annular varistor is provided outside the steering sheet 232 of the steering gear 23, and the first varistor 31 implemented as an annular varistor is electrically connected to the hook 233.

The first varistor 31 implemented as a ring varistor is disposed on a side of the diverter 23 close to the coil assembly 22 to suppress electromagnetic waves generated during operation of the rotor 20 and reduce electromagnetic interference generated during operation of the rotor 20.

The anti-electromagnetic interference motor further comprises a plastic package assembly 40. The plastic package assembly 40 is disposed between the first varistor 31 implemented as an annular varistor and the coil 222 of the coil assembly 22. The plastic package assembly 40 can fill a gap between the first piezoresistor 31 and the coil 23, and two ends of the plastic package assembly 40 are respectively in contact with the upper end surface of the coil 222 and the lower end surface of the first piezoresistor 31.

Preferably, the first mold assembly 40 is implemented as epoxy resin. After the first varistor 31 is electrically connected to the hook 233 of the steering gear 23, the first mold assembly 40 implemented as an epoxy resin can be filled between the first varistor 31 and the coil 222.

On one hand, the plastic package assembly 40 implemented as epoxy resin can support the first piezoresistor 31, so that when the first piezoresistor 31 is impacted by self gravity and the outside, the connection between the first piezoresistor 31 and the hook 233 of the steering gear 23 is disconnected, the connection stability between the first piezoresistor 31 and the hook 233 of the steering gear 23 is increased, and the stability of the overall working performance of the motor is further improved.

On the other hand, the plastic package assembly 40 implemented as epoxy resin further wraps the connection portion between the end of the coil 222 and the hook 233 of the steering gear 23, so that the stability of the electrical connection between the coil 222 and the hook 233 of the steering gear 23 is increased, the disconnection between the end of the coil 222 and the hook 233 due to external impact or other factors is prevented in the use process of the motor, and the stability of the motor in the use process is improved.

It should be understood by those skilled in the art that the plastic package assembly 40 may be implemented with other materials in other preferred embodiments of the present invention. The specific material of which the plastic package assembly 40 is implemented should not be construed as limiting the invention as long as the object of the invention is achieved.

Referring to fig. 4, the stator 10 further has a mounting groove 121 formed in the end cover 12, and includes a bearing 122 disposed in the mounting groove 121. The connecting end 212 of the rotating shaft 21 is rotatably installed in the through hole of the bearing 122, the bearing 122 is in contact with the connecting end 212 of the rotating shaft 21, and the bearing 122 can provide support for the connecting end 212 of the rotating shaft 21 and allow the connecting end 212 of the rotating shaft 21 to rotate.

The stator 10 further includes two brush assemblies 14, the two brush assemblies 14 are disposed inside the end cover 12, and the brush assemblies 14 can contact with the steering gear 23 of the rotor 20, so that the coils 222 of the rotor 20 can be electrically connected to an external circuit, and the rotor 20 can rotate in the mounting cavity 13.

Specifically, the brush piece assembly 14 further includes a connecting piece 141 and a brush member 142 disposed at one end of the connecting piece 141. Specifically, the connecting piece 141 further includes a fixed end 1411 and a movable end 1412. The brush 142 is disposed at the movable end 1412 of the connecting piece 141. The two fixed ends 1411 of the two connecting pieces 141 of the two brush piece assemblies 14 are respectively fixedly mounted on the inner side of the end cover 12.

The movable end 1412 of the connection piece 141 is located at both sides of the connection end 212 of the rotation shaft 21, and the brush 142 mounted to the connection piece 141 can contact the outer side of the turn piece 232 of the deflector 23, so that the direction of the current flowing through the coil 222 of the coil block 22 can be maintained constant during the rotation of the deflector 23.

Preferably, in the preferred embodiment, the brush 142 is implemented as a carbon brush made of copper powder and carbon powder, so that the brush 142 can conduct electricity and reduce sparks generated during rotation when the brush 142 keeps in contact with the turning piece 232 of the steering gear 23 and rotates, thereby reducing electromagnetic interference generated when the brush 142 and the turning piece 232 of the steering gear 23 rotate relatively.

Preferably, in the preferred embodiment, the proportion of copper powder in the brush 142 is 50% to 60% to control the intensity of spark generated when the brush 142 and the deflecting piece 232 of the deflector 23 rotate with each other. Thereby reducing the intensity of electromagnetic interference generated when the rotor 20 operates. And fifty to sixty percent copper powder content does not affect the wire performance of the brush 142.

It will be appreciated by those skilled in the art that the brush member 142 can be made of other materials, and the specific material of the brush member 142 should not be construed as limiting the present invention as long as the object of the present invention can be achieved.

Accordingly, the stator 10 further has two fixing grooves 123 formed at the inner side of the end cover 12. The fixed ends 1411 of the two connection pieces 141 are respectively fixed to the two fixing grooves 123, so that the connection pieces 141 and the brush 142 are fixed to the inner side of the end cap 12. And, when the fixed ends 1411 of the two connection pieces 141 are fixed in the two fixing slots 123 inside the end cap 12, the two movable ends 1412 of the two connection pieces 141 are located at both sides of the connection end 212 of the rotation shaft 21. And the brushes 142 at the movable ends 1412 of the connecting pieces 141 are respectively in contact with the turning pieces 232 of the deflector 23.

Preferably, the connecting piece 141 is made of a copper material, and the two connecting pieces 141 are electrically connected to the steering gear 23 through the two brushes 142, respectively. The connecting pieces 141 also have certain elasticity, and the two connecting ends 212 of the two connecting pieces 141 have a tendency to approach each other. When the connecting end 212 of the rotating shaft 21 is placed between the two movable ends 1412 of the connecting pieces 141, the brush 142 can be tightly contacted with the outer side of the turning piece 232 of the steering gear 23, and the brush 142 is electrically connected with the steering gear 23.

Referring to fig. 3 and 4, the emi electronic component 30 further includes a first inductor 32, a second inductor 33, a first capacitor 34, a second capacitor 35, a third capacitor 36, and a second varistor 37. The first inductor 32, the second inductor 33, the first capacitor 34, the second capacitor 35, and the third capacitor 36 are respectively disposed inside the end cap 12 of the stator 10, and the second varistor 37 is disposed outside the end cap 12 of the stator 10.

The stator 10 further includes a first tab 151 and a second tab 152. The first and

second tabs

151 and 152 are respectively provided on the outer side of the end cap 12. And one end of the first tab 151 and one end of the second tab 152 are respectively in contact with the outside of the end cap 12, and the other ends extend toward the outside of the end cap 12. The first and

second tabs

151 and 152 of the stator 10 can be electrically connected to an external circuit, and the first and

second tabs

151 and 152 are electrically connected to the emi shielding electronic component 30, respectively.

Specifically, both ends of the first inductor 32 are electrically connected to the fixed end 1412 of the first connection tab 141 and the first connection tab 151, respectively. Both ends of the second inductor 33 are electrically connected to the fixed end 1412 of the second connection piece 142 and the second connection piece 152, respectively. Both ends of the second capacitor 35 are electrically connected to the first tab 151 and the case 11 of the stator 10, respectively. Both ends of the third capacitor 36 are electrically connected to the second tab 152 and the housing 11 of the stator 10, respectively. Both ends of the first capacitor 34 are electrically connected to the first and

second tabs

151 and 152, respectively.

That is, the first inductor 32, the second inductor 33, the first capacitor 34, the second capacitor 35 and the third capacitor 36 form an anti-electromagnetic interference circuit between the coil 222 of the rotor 20 and an external circuit, so as to reduce the intensity of electromagnetic interference generated when the rotor 20 rotates.

Referring to fig. 9, a schematic diagram of a circuit structure of the anti-jamming motor provided by the present invention is shown. The first capacitor 34(C1) is connected in parallel between the positive pole and the negative pole of the motor. The second capacitor 35(C2) is connected in parallel between the positive pole of the motor and the housing 11. The third capacitor 36(C3) is connected in parallel between the negative pole of the motor and the housing 11. The first inductor 32(L1) is connected in series between the positive pole of the motor and the coil 222 of the motor. The second inductor 33(L2) is connected in series between the negative pole of the motor and the coil 222 of the motor.

A filtering LC filter circuit is formed among the first inductor 32(L1), the second inductor 33(L2), the first capacitor 34(C1), the second capacitor 35(C2), and the third capacitor 36(C3), so as to reduce the intensity of electromagnetic interference generated when the motor operates, and improve the capability of the motor against electromagnetic interference.

Specifically, the primary function of the first capacitor 34 is to suppress the differential mode interference electromagnetic waves in the spark (arc) generated by the mutual rotation between the diverter 23 and the brush 142 during the operation of the motor. The wave band of the differential mode interference electromagnetic wave is mainly concentrated at 150 kHz-30 kHz.

The main function of the second capacitor 35 and the third capacitor 36 is to suppress common mode interference electromagnetic waves in the spark (arc) generated by the mutual movement between the steering gear 23 and the brush 142 during the operation of the motor. The wave band of the common mode interference electromagnetic wave is only required to be concentrated at 30 MHz-2.5 GHz.

The first inductor 32 and the second inductor 33 are used as energy storage filter elements, and in the circuit, an LC resonance circuit is generated with the first capacitor 34, the second capacitor 35 and the third capacitor 36, so that the differential mode and common mode interference signals are suppressed.

Preferably, in the present preferred embodiment, the first inductor 32 and the second inductor 33 are implemented as rod-shaped differential mode inductors, respectively. The first capacitor 34, the second capacitor 35, and the third capacitor 36 are each implemented as a multilayer ceramic capacitor. It should be understood by those skilled in the art that the first inductor 32, the second inductor 33, the first capacitor 34, the second capacitor 35 and the third capacitor 36 may be implemented as other types of inductors or capacitors as long as the objects of the present invention can be achieved, and the specific type of the two inductors and the three capacitors should not be construed as limiting the present invention.

In the preferred embodiment, the second varistor 37 is disposed outside the end cap 12 of the stator 10, and two presser feet 371 of the second varistor 37 are electrically connected to the first terminal piece 151 and the second terminal piece 152, respectively. That is, the second varistor 37 is connected in parallel between the positive pole and the negative pole of the motor. The second voltage dependent resistor 37 is used to suppress transient voltages at the switching instants of the motor.

In the preferred embodiment, the second varistor 37 is disposed outside the end cover 12 of the stator 10, so that the second varistor 37 can be prevented from occupying the inner space of the mounting cavity 13, which is beneficial to reducing the space volume of the stator 10, and thus reducing the overall volume of the motor. And the second piezoresistor 37 is electrically connected to the first lug 151 and the second lug 152 on the outer side of the end cap 12, which also makes the wiring arrangement on the inner side of the end cap 12 simpler, and facilitates installation and subsequent maintenance.

Preferably, the housing 11 of the stator 10 is made of a conductor. When both ends of the second capacitor 35 and the third capacitor 36 are electrically connected to the housing 11, respectively, both ends of the first capacitor 34 and the second capacitor 35 are grounded.

Specifically, the stator 10 further includes two hollow rivets 161 and two conductive spacers 162. The pop rivet 161 and the conductive pad 162 are used to electrically connect the first terminal lug 151 and the second terminal lug 152 to the corresponding emi shielding electronic component 30.

Specifically, the end cap 12 further has two through holes 124. The two through holes 124 are located on the upper surface of the end cap 12, and the through holes 124 penetrate through the upper end surface of the end cap 12. The shape and size of the hollow rivet 161 correspond to those of the through hole 124, and the two hollow rivets 161 are fitted into the two through holes 124 of the end cap 12. The upper and lower ends of the hollow rivet 161 protrude from the inner and outer sides of the upper end surface of the end cap 12, respectively.

The conductive pad 162 is provided outside the upper end surface of the end cap 12. The two conductive pads 162 are electrically connected to the two pop rivets 161, respectively, and the two conductive pads 162 are also electrically connected to the first and

second tabs

151 and 152, respectively.

Specifically, both ends of one of the conductive pads 162 are electrically connected to an upper end of one of the pop rivets 161 and a bottom end of the first tab 151, respectively. Both ends of the other conductive pad 162 are electrically connected to the upper end of the other pop rivet 161 and the bottom end of the second tab 152, respectively. It will be understood by those skilled in the art that in other preferred embodiments of the present invention, the two conductive pads 162 can be integrally connected to the bottom ends of the two terminal strips and/or the upper ends of the two pop rivets 161, respectively.

The lower end portions of the two hollow rivets 161 are respectively located inside the end caps 12 and are electrically connected to the corresponding inductors and/or capacitors. Specifically, two ends of the first capacitor 34 are electrically connected to two lower ends of the hollow rivets 161, respectively. One end of the first inductor 32 and one end of the second capacitor 35 are electrically connected to a lower end of one of the pop rivets 161, and one end of the second inductor 33 and one end of the third capacitor 36 are electrically connected to a lower end of the other pop rivet 161. The two presser feet 371 of the second varistor 37 are electrically connected to the two upper ends of the hollow rivets 161, respectively.

It should be noted that, in the preferred embodiment, the second varistor 37 is disposed outside the top end of the end cover 12, which not only reduces the occupied internal space of the housing 11, but also is beneficial to reducing the overall volume of the motor. The second piezoresistor 37 is arranged on the outer side of the top end of the end cover 12, so that the contact area of the second piezoresistor 37 and air can be increased, and the heat dissipation capacity of the second piezoresistor 37 is improved. Moreover, the second piezoresistor 37 is arranged at the outer side of the top end of the end cover 12, so that the second piezoresistor 37 can be conveniently installed. And the second piezoresistor 37 can be arranged on the outer side of the end cover 12 after the end cover 12 is arranged on the shell 11, which brings great convenience to the assembly of the motor.

The first capacitor 34 has a capacitance value in the range of 1 picofarad (pF) to 1 farad (F). The second capacitor 35 has a capacitance value ranging from 1 picofarad (pF) to 400000 picofarads (pF). The capacitance value of the third capacitor 36 ranges from 1 picofarad (pF) to 400000 picofarads (pF). The inductance value of the first inductor 32 ranges from 1 microhenry (mH) to 1 henry (H). The inductance value of the second inductor 33 ranges from 1 microhenry (mH) to 1 henry (H). The second varistor 37 has a resistance value in the range of 1 ohm (Ω) to 1000 ohm (Ω).

Preferably, in the preferred embodiment, the capacitance value of the first capacitor 34 is 470000 pF. The capacitance value of the second capacitor 35 and the capacitance value of the third capacitor 36 are both 10000 pF. The first inductance 32 and the second inductance 33 are both 4.5uH (4 × 12). The second varistor 37 has a resistance of 20 ohms, and the second varistor 37 is embodied with the specific model number 07K 20.

Preferably, in the present preferred embodiment, the operating voltages of the first capacitor 34, the second capacitor 35 and the third capacitor 36 are all 63V.

It should be noted that in the preferred embodiment, the three capacitors and the two inductors are selected in consideration of the space inside the motor, the operating voltage of the motor, and the electromagnetic compatibility. On the premise of ensuring that the working voltage of the motor can be met, the overall size of the motor is reduced while the battery compatibility is improved. It should be understood by those skilled in the art that the sizes and the sum of the three capacitors, the two inductors and the second voltage dependent resistor can be adjusted accordingly or different types and sizes of products can be selected, and the types and the sizes of the three capacitors, the two inductors and the second voltage dependent resistor should not be construed as limiting the invention as long as the object of the invention can be achieved.

The housing 11 further has a lower through hole 111. The lower through hole 111 is formed in a lower end cover of the housing 11, and the lower through hole 111 communicates the mounting cavity 13 with the external environment. When the rotor 20 is rotatably mounted in the mounting cavity 13 of the stator 10, the driving end 211 of the rotating shaft 21 of the rotor 20 passes through the lower through hole 111 and protrudes outside the lower end cover of the housing 11. And the shape and size of the driving end 211 of the rotating shaft 21 correspond to those of the lower through hole 111, and the driving end 211 of the rotating shaft 21 can rotate in the lower through hole 111, so as to transmit power to the outside and drive the rotation of an external object.

The rotor 20 further includes a retaining ring 24. The positioning ring 24 is mounted or integrally formed on the upper end of the drive end 211 of the shaft 21, and the positioning ring 24 is located on the lower end of the coil block 22. That is, the positioning ring 24 is located between the coil assembly 22 and the drive end 211 of the shaft 21.

When the rotor 20 is installed in the installation cavity 13 of the stator 10 and the driving end 211 of the rotating shaft 21 protrudes outside the lower end surface of the housing 11, the positioning ring 24 can contact with the inner surface of the lower end cover of the housing 11 to position the rotating shaft 21 of the rotor 20, so as to prevent the coil assembly 22 of the rotor 20 from contacting with the lower end cover of the housing 11 and affecting the normal rotation of the rotor 20.

Referring to fig. 5A and 5B, the housing 11 further has a set of heat dissipation holes 112. The heat dissipation hole 112 is formed in a lower end cover of the housing 11, and the heat dissipation hole 112 penetrates through the lower end cover of the housing 11 to communicate the mounting cavity 13 with the external environment. The heat dissipation hole 112 surrounds the lower through hole 111. The gas in the installation cavity 13 can enter the external environment through the heat dissipation holes 112, so as to take away the heat generated in the installation cavity 13, improve the heat dissipation efficiency, and increase the working stability of the motor.

The end cap 12 further includes a set of snaps 125. One end of the buckle 125 is connected to the outside of the upper end surface of the end cap 12, and the other end extends below the upper end surface.

The housing 11 further has a set of card slots 113. The card slot 113 is provided in the upper end wall of the housing 11. The number and shape of the slots 113 correspond to the number and shape of the clips 125, and the clips 125 can be snapped into the slots 113 to fix the end cap 12 to the housing 11, so that the rotor 20 can be rotatably mounted between the end cap 12 and the housing 11.

It should be understood by those skilled in the art that the end cap 12 and the housing 11 may be connected by a screw thread, an interference fit, a screw or other connection methods, and the specific connection method between the end cap 12 and the housing 11 should not be construed as limiting the invention as long as the object of the invention can be achieved.

Referring to fig. 10, the present invention further provides a method of assembling a cap assembly according to another aspect of the present invention, wherein the method comprises the steps of:

step 101: fixing a bearing at the inner side of an end cover;

step 102: mounting two brush sheet assemblies on the inner side of the end cover;

step 103: mounting two lugs on the outer side of the end cover; and

Wherein the step 104 further comprises the steps of:

step 1042: mounting a second piezoresistor component on the outer side of the end cover, and electrically connecting two ends of the second piezoresistor component to the two lugs respectively;

wherein the second piezoresistor is 07K 20.

Wherein said step 1041 further comprises the steps of:

Wherein the order of step 10411 and said step 10422 may be interchanged.

Wherein in the step 10411, the first inductance and the second inductance are respectively 4.5 uH.

Wherein in the step 10412, the first capacitor has a size of 470000 picofarads (63V), and the second capacitor and the third capacitor have a size of 10000 picofarads (63V).

Referring to fig. 11, the present invention further provides a method of assembling a rotor of an electric machine, according to another aspect of the present invention, wherein the method comprises the steps of:

step 201: mounting a coil assembly on a rotating shaft;

In step 203, a connection between an end of the coil and a hook of the steering gear is wrapped on the plastic package assembly.

Wherein in the step 203, the plastic package assembly is implemented as epoxy resin.

Referring to fig. 12, the present invention further provides a method of assembling a tamper resistant motor, according to another aspect of the present invention, wherein the method comprises the steps of:

301, installing a rotor in a shell; and

step 302: and mounting a cover assembly on the top end of the shell.

Wherein the step 301 further comprises the steps of:

step 3011: mounting a coil assembly on a rotating shaft;

Wherein the step 302 further comprises the following steps:

step 3021: fixing a bearing at the inner side of an end cover;

step 3023: mounting two lugs on the outer side of the end cover; and

step 3024: mounting an anti-electromagnetic interference electronic component on the end cap

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. An anti-electromagnetic interference motor, comprising:

2. The anti-electromagnetic interference motor of claim 1, wherein the anti-electromagnetic interference motor further comprises a plastic package assembly, the plastic package assembly being disposed between the top surface of the coil assembly and the bottom surface of the first varistor.

3. The anti-electromagnetic interference motor according to claim 2, wherein a joint between both ends of a coil of the coil assembly and a set of hooks of the steering assembly is wrapped by the plastic package assembly.

4. The anti-electromagnetic interference motor of claim 2, wherein the plastic encapsulated assembly is implemented as an epoxy.

5. The anti-electromagnetic interference electric machine of claim 1, wherein the inductor-capacitor assembly includes a first capacitor, a second capacitor, a third capacitor, a first inductor, and a second inductor, wherein the first inductor is electrically connected to the first lug and the first brush assembly, respectively, the second inductor is electrically connected to the second lug and the second brush assembly, respectively, the first capacitor is electrically connected to the first lug and the second lug, respectively, the second capacitor is electrically connected to the first lug and the housing, respectively, and the third capacitor is electrically connected to the second lug and the housing, respectively.

6. The anti-electromagnetic interference motor of claim 1, wherein two pressure feet of the second piezoresistor are electrically connected to the first and second terminal lugs, respectively.

7. The anti-electromagnetic interference motor of claim 5, wherein the first capacitor has a capacitance value in a range of 1 picofarad (pF) to 1 farad (F); the capacitance value of the second capacitor ranges from 1 picofarad (pF) to 400000 picofarads (pF); the capacitance value of the third capacitor ranges from 1 picofarad (pF) to 400000 picofarads (pF); the inductance value of the first inductor ranges from 1 microHenry (mH) to 1 Henry (H); the inductance value of the second inductor ranges from 1 microHenry (mH) to 1 Henry (H); the resistance value range of the second piezoresistor is 1 ohm (omega) to 1000 ohm (omega).

8. The anti-electromagnetic interference motor of claim 7, wherein the second varistor model number is 07K20, wherein the first inductance and the second inductance are 4.5uH in size, the second capacitance and the third capacitance are 10000pf (63V) in size, and the first capacitance is 470000pf (63V).

9. The anti-electromagnetic interference motor according to any one of claims 1 to 8, wherein the first brush piece and the second brush piece each include a connecting piece and a brush member provided at a movable end of the connecting piece.

10. The anti-electromagnetic interference electric machine of claim 9, wherein the brush is made from copper powder and carbon powder.

11. An anti-electromagnetic interference electric machine as claimed in claim 10, wherein the brush member has a copper powder content of 50% to 60%.

12. An anti-electromagnetic interference motor, comprising:

and the plastic package assembly is arranged between the first piezoresistor and the coil assembly and is in contact with the top end of the coil assembly and the bottom end of the first piezoresistor.

13. The electromagnetic interference resistant motor of claim 12, wherein the plastic encapsulated assembly is implemented as an epoxy.

14. The anti-electromagnetic interference motor of claim 12, wherein the plastic package assembly wraps a connection between two ends of a coil of the coil assembly and a set of hooks of the steering gear.

15. The anti-electromagnetic interference motor of claim 12, wherein the first varistor is implemented as a ring varistor.

16. A method of assembling an end cap assembly for a tamper resistant motor, wherein the method comprises the steps of:

step 101: fixing a bearing at the inner side of an end cover;

step 103: mounting two lugs on the outer side of the end cover; and

17. The method of assembling an end cap assembly according to claim 16, wherein in step 104 further comprising the steps of:

step 1042, installing a second voltage dependent resistor assembly outside the end cap, and electrically connecting two ends of the second voltage dependent resistor assembly to the two connection plates respectively.

18. The method of assembling an end cap assembly of claim 17, further comprising in said step 1041 the step of:

19. The method of assembling an end cap assembly of claim 18, wherein the second varistor model number is 07K20, wherein the first and second inductors are sized to be 4.5uH, the second and third capacitors are sized to be 10000pf (63V), and the first capacitor is sized to be 470000pf (63V).

20. A method of assembling a stator of a tamper resistant electric machine, wherein said method comprises the steps of:

step 201: mounting a coil assembly on a rotating shaft;

21. The method of assembling an electric machine stator as claimed in claim 20, wherein a connection between an end of the coil and a hook of the steering gear is wrapped around the plastic package.

22. The method of assembling an electric machine stator of claim 21, wherein the plastic encapsulated assembly is implemented as an epoxy.

23. A method of assembling a tamper resistant motor, wherein said method comprises the steps of:

step 301: mounting a rotor in a mounting cavity of a housing; and

step 302: and mounting a cover assembly on the top end of the shell.

24. The method of assembling a tamper resistant motor according to claim 23, wherein said step 301 further comprises the steps of:

step 3011: mounting a coil assembly on a rotating shaft;

25. The method of assembling a tamper resistant motor according to claim 23, further comprising in said step 302 the steps of:

step 3021: fixing a bearing at the inner side of an end cover;

step 3023: mounting two lugs on the outer side of the end cover; and