CN210693701U - Circuit structure, motor and air conditioner for restraining EMC - Google Patents

Abstract

The utility model provides a restrain EMC's circuit structure, motor and air conditioner. Restrain EMC's circuit structure and set up in the motor, the motor is including the stator core of band winding, be located the control panel in the middle of the stator core and be located the DC power supply on the control panel, restrain EMC's circuit structure and be located on the control panel, including conducting strip and Y electric capacity, the first pin of Y electric capacity is connected DC power supply's negative pole, the second pin of Y electric capacity is connected the first end of conducting strip, the second end of conducting strip is connected stator core. The utility model only needs to add Y capacitance and conducting strip, and occupies smaller space; the Y capacitor is in large-area contact with the stator core through the conducting strip, and large-area grounding of the Y capacitor is achieved; through Y electric capacity large tracts of land ground connection, one end connects the direct current power negative pole, makes EMC interference signal flow to ground, the effective EMC interference who suppresses the circuit.

Description

Circuit structure, motor and air conditioner for restraining EMC

Technical Field

The utility model relates to an improve EMC (Electro Magnetic Compatibility ) technical field, especially relate to a restrain EMC's circuit structure, motor and air conditioner.

Background

EMC refers to the ability of a device or system to operate satisfactorily in its electromagnetic environment and not to generate intolerable electromagnetic interference to any device in its environment. Therefore, EMC includes two requirements: on one hand, the electromagnetic interference generated to the environment by the equipment in the normal operation process cannot exceed a certain limit value; another aspect is that the appliance has a degree of immunity to electromagnetic interference present in the environment, i.e., electromagnetic susceptibility.

In order to ensure that the motor runs stably in an electromagnetic environment, effective suppression of EMC is always the direction of efforts of researchers of motor controllers. EMC not only can lead to signal transmission distortion, turns to untimely scheduling problem, but also can produce certain influence to the operation of electronic components around the motor.

For a small motor, the layout of electronic components is compact and the anti-interference capability is poor due to the compact structure, the small area of the controller and the limited wiring space. And the small-sized motor adopts a plastic package shell, so that the large-area grounding of the Y capacitor is difficult. Researchers are also trying to find a circuit structure suitable for suppressing the EMC of a small-sized motor, and the conventional circuit structure for suppressing the EMC generally connects a negative terminal of a power supply with a capacitor and a wire to the ground, so that the circuit structure has a limited contact area with the ground and has a poor effect of suppressing the EMC of the motor. For a short board existing in the aspect of suppressing the EMC of a small motor, a circuit structure suitable for the small motor and rational in effect of suppressing the EMC is a popular research direction for a controller researcher.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to avoid the weak point among the prior art and provide a circuit structure, motor and the air conditioner that restrain EMC, realize that traditional small-size motor is limited in the wiring space, effectively restrain motor EMC under the little condition of ground area, promote product property ability.

The purpose of the utility model is realized through the following technical scheme:

in a first aspect, the utility model provides an restrain EMC's circuit structure sets up in the motor, the motor includes the stator core of band winding, is located the control panel in the middle of the stator core and is located the DC power supply on the control panel, restrain EMC's circuit structure and be located on the control panel, including conducting strip and Y electric capacity, the first pin of Y electric capacity is connected DC power supply's negative pole, the second pin of Y electric capacity is connected the first end of conducting strip, the second end of conducting strip is connected stator core.

Preferably, the stator core includes stator yoke portion and skeleton, the second end of conducting strip install in on the skeleton, stator yoke portion install in the skeleton with the second of conducting strip is served.

Preferably, the conducting plate is a metal plate with three surfaces forming a right-angle Z shape, the top surface is a first end of the conducting plate, and the bottom surface is a second end of the conducting plate.

Preferably, the top surface of the conducting strip is a tapered trapezoidal surface, the bottom surface of the conducting strip is rectangular, and the bottom surface of the conducting strip is provided with an installation block matched with the framework.

Preferably, the narrowest part of the top surface of the conducting strip is as long as the width of the Y capacitor.

Preferably, one side of the control board, which is connected with the stator core and provided with the windings, is a front side, one side without the windings is a back side, the direct-current power supply is arranged on the front side of the control board, and the Y capacitor and the conducting strip are arranged on the back side of the control board.

Preferably, a wire through hole is formed in the control board, and the first end of the Y capacitor penetrates through the wire through hole through a wire and is connected to the negative electrode of the direct-current power supply.

Preferably, the Y-capacitance is a Y-capacitance whose specification parameter corresponds to the EMC interference frequency of the motor.

In a second aspect, the present invention provides a motor, including the first aspect, the circuit structure for suppressing EMC.

In a third aspect, the present invention provides an air conditioner comprising the motor of the second aspect.

According to the above technical scheme, the utility model discloses following beneficial effect has: compared with the prior art, the utility model provides a restrain EMC's circuit structure, motor and air conditioner. By adopting the circuit structure for inhibiting the EMC, the Y capacitor accessed into the circuit weakens or even eliminates the common mode interference generated and received in the circuit, effectively inhibits the EMC and realizes accurate and error-free transmission of signals; the Y capacitor is matched with the stator core through the conducting strip, so that large-area grounding of the Y capacitor is realized; the utility model discloses a circuit structure only needs to increase Y electric capacity and conducting strip, and the inside space of the shared motor of the two is very little, realizes that traditional small-size motor installation restraines EMC circuit structure under the limited condition in wiring space.

Drawings

The invention is further described with the aid of the accompanying drawings, in which, however, the embodiments do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived from the following drawings without inventive effort.

Fig. 1 is an exploded schematic view of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an embodiment of the present invention.

Fig. 3 is a schematic diagram of an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a conductive sheet according to an embodiment of the present invention.

Wherein the reference numbers are as follows: 1. the motor comprises a control board, 2, Y capacitors, 3 conducting plates, 301 conducting plate first ends, 302 conducting plate second ends, 303 conducting plate mounting portions, 4 stator cores, 401 frameworks, 402 stator yokes and 5 conducting wire through holes.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

As shown in fig. 1 to 4, the circuit structure for suppressing EMC of this embodiment is disposed in a motor, the motor includes a stator core 4 with a winding, a control board 1 located in the middle of the stator core 4, and a dc power supply located on the control board 1, the circuit structure for suppressing EMC is located on the control board 1, a conductive sheet 3 and a Y capacitor 2, a first pin of the Y capacitor 2 is connected to a negative electrode of the dc power supply, a second pin of the Y capacitor 2 is connected to a first end 301 of the conductive sheet 3, a second end 302 of the conductive sheet 3 is connected to the stator core 4, a controller is disposed on the control board 1, and the controller controls the motor to operate and provides the dc power supply for the circuit structure for suppressing EMC.

In this embodiment, the stator core 4 includes a framework 401 and a stator yoke 402, the conductive plate 3 is a metal plate with three surfaces forming a right-angle "Z" shape, the top surface is a first end 301 of the conductive plate, the bottom surface is a second end 302 of the conductive plate, the top surface of the conductive plate 3 is a tapered step surface, the bottom surface of the conductive plate 3 is rectangular, and the bottom surface of the conductive plate 3 is provided with a mounting block 303 adapted to the framework 401.

The conducting plate 3 is matched with the slot of the framework 401 through the mounting part 303 of the second end 302, so that the conducting plate 3 is mounted on the framework, the stator choke part 402 is mounted on the second end 302 of the conducting plate 3, one surface of the conducting plate 3, which is perpendicular to the second end 302, is attached to the stator choke part 402, the first end 301 of the conducting plate 3 is a gradually narrowed step surface, wherein the length of the narrowest side of the step surface is equal to the length of the Y capacitor, the narrowest side of the first end 301 of the conducting plate 3 is welded with the second end of the Y capacitor 2, the second end 302 of the conducting plate 3 is fixed between the stator choke part 402 and the framework 401, so that the Y capacitor 2 is connected with the stator core 4 in a large area, the first end of the Y capacitor 2 is connected with the negative pole of a direct-current power supply (namely the reference ground of the direct-current power supply), the conducting plate 3 is a low-impedance metal plate, and the Y capacitor, the large-area grounding of the Y capacitor 2 under the plastic package shell is realized, and a better EMC suppression effect is realized.

The control panel 1 in this embodiment is provided with the wire through hole 5, the one side of laying the winding wire with the control panel 1 is established to control panel 1 openly, the one side of not laying the winding wire is control panel 1's reverse side, direct current power supply establishes the openly at control panel 1, Y electric capacity 2 and conducting strip 3's first end 301 locate control panel 1's reverse side, Y electric capacity 2's first end passes through wire through hole 5 back and is connected to the positive direct current power supply of control panel 1 through the wire, this connected mode can furthest't practice thrift the space, more make things convenient for the little motor use in inside idle space.

The Y capacitor 2 in this embodiment is a Y capacitor 2 whose specification parameter corresponds to the EMC interference frequency of the motor, so that the EMC interference signal can more easily pass through the Y capacitor 2, and the specification parameter of the Y capacitor 2 corresponds to the EMC interference frequency of the motor, which means that the resonance point frequency of the Y capacitor 2 is close to or equal to the EMC interference frequency of the motor. Wherein, the capacity of the Y capacitor 2 determines the resonant point frequency thereof; this embodiment may select a Y capacitor having a capacity in the range of 100pF (picofarad) to 10000pF (picofarad).

The mounting process of the circuit structure for suppressing EMC of the present embodiment is as follows: welding the Y capacitor 2 on a pad on the back of the control board 1; the mounting block 303 at the second end 302 of the conducting plate 3 is matched with the framework 401 to mount the conducting plate 3; connecting the first end 301 of the conducting sheet 3 with the second end of the Y capacitor 2 through soldering tin; the stator yoke 401 and the framework 402 are installed in a matched mode, and the circuit structure for restraining the EMC is simple and convenient to install.

The working principle of the embodiment is as follows: with the circuit structure for suppressing EMC provided in this embodiment, when the EMC interference signal generated by the controller flows to the negative pole of the dc power supply (i.e. the ground reference of the dc power supply), a low impedance loop is provided for such EMC interference through the Y capacitor 2, the conducting strip 3 and the stator core 4. When the EMC interference signal flows to the negative pole path (i.e. the reference ground of the dc power supply) of the dc power supply, the EMC interference signal corresponding to the resonance frequency of the Y capacitor basically flows to the stator core 4 through the Y capacitor 2 and the conducting strip 3, and the electronic core 4 is grounded, so that the EMC interference flows to the ground, thereby preventing the EMC interference signal generated by the motor itself from flowing out of the motor, and meanwhile, the EMC interference signal is consumed to the ground in the loop formed by the Y capacitor 2, the conducting strip 3, the stator core 4 and the ground. Similarly, when the controller and the power device of the motor are interfered by external EMC, the EMC interference signals are consumed as the EMC interference generated by the controller, so that the EMC interference of the motor can be inhibited.

According to the circuit structure for inhibiting EMC provided by the invention, only the Y capacitor 2 and the conducting strip 3 need to be added in a controller of the motor, the first end 301 of the conducting strip 3 is attached to the control plate 1, the second end 302 of the conducting strip 3 is installed between the stator yoke part 402 and the framework 401, one surface of the conducting strip 3 perpendicular to the first end 301 and the second end 302 is attached to the stator yoke part 302, and the Y capacitor 2 is attached to the control plate 1, so that the space occupied by the two parts in the motor is small, and the large-area contact between the Y capacitor 2 and the stator core 4 is realized through the conducting strip 3, and the large-area grounding of the Y capacitor 2. Therefore, the circuit structure for restraining EMC provided by the invention can be applied to the motor with smaller internal idle space caused by the built-in controller.

It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A circuit structure for suppressing EMC is provided in a motor, characterized in that: the motor includes the stator core of band winding, is located the control panel in the middle of the stator core and is located the DC power supply on the control panel, the circuit structure who restraines EMC is located on the control panel, including conducting strip and Y electric capacity, the first pin of Y electric capacity is connected DC power supply's negative pole, the second pin of Y electric capacity is connected the first end of conducting strip, the second end of conducting strip is connected stator core.

2. A circuit structure of suppressing EMC as claimed in claim 1, wherein: stator core includes stator yoke portion and skeleton, the second end of conducting strip install in on the skeleton, stator yoke portion install in the skeleton with the second of conducting strip is served.

3. A circuit structure of suppressing EMC as claimed in claim 2, wherein: the conducting plate is a metal plate with three surfaces forming a right-angle Z shape, the top surface is a first end of the conducting plate, and the bottom surface is a second end of the conducting plate.

4. A circuit structure of suppressing EMC as claimed in claim 3, wherein: the top surface of the conducting strip is a tapered ladder surface, the bottom surface of the conducting strip is rectangular, and the bottom surface of the conducting strip is provided with an installation block matched with the framework.

5. A circuit structure of suppressing EMC as claimed in claim 4, wherein: the length of the narrowest part of the top surface of the conducting strip is the same as the width of the Y capacitor.

6. A circuit structure of suppressing EMC as claimed in claim 1, wherein: the direct-current power supply is arranged on the front surface of the control panel, and the Y capacitor and the conducting strip are arranged on the back surface of the control panel.

7. A circuit structure of suppressing EMC as claimed in claim 1, wherein: and a lead through hole is formed in the control panel, and the first end of the Y capacitor penetrates through the lead through hole through a lead and is connected to the negative electrode of the direct-current power supply.

8. A circuit structure of suppressing EMC as claimed in claim 1, wherein: and the Y capacitor is a Y capacitor with specification parameters corresponding to the EMC interference frequency of the motor.

9. An electric machine characterized by: the motor includes the EMC suppressing circuit structure of any one of claims 1 to 8.

10. An air conditioner, characterized in that: the air conditioner includes the motor of claim 9.

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