阅读说明：本技术 一种有刷电机 (Brush motor ) 是由 罗辉生 阮鹏 沈政委 于 2020-12-23 设计创作，主要内容包括：本发明公开了一种有刷电机,包括电机壳体、电机线圈以及滤波电路结构,电机壳体为存在内部空间的壳体结构,电机壳体的内部空间包括电机部分以及电路部分,电机线圈内置于电机部分,滤波电路结构内置于电路部分,电机部分以及电路部分之间设有屏蔽板。通过在屏蔽板,为滤波电路提供内部屏蔽隔仓,很大程度的保证了滤波电路应有的性能,有效地控制了电机工作时对外产生的电磁干扰。(The invention discloses a brush motor, which comprises a motor shell, a motor coil and a filter circuit structure, wherein the motor shell is of a shell structure with an internal space, the internal space of the motor shell comprises a motor part and a circuit part, the motor coil is arranged in the motor part, the filter circuit structure is arranged in the circuit part, and a shielding plate is arranged between the motor part and the circuit part. Through at the shield plate, provide the internal shield compartment for filter circuit, the due performance of filter circuit has been guaranteed to very big degree, has controlled the external electromagnetic interference who produces of motor during operation effectively.)

1. A brush motor is characterized by comprising a motor shell, a motor coil and a filter circuit structure;

the motor shell is of a shell structure with an inner space, the inner space of the motor shell comprises a motor part and a circuit part, a motor coil is arranged in the motor part, a filter circuit structure is arranged in the circuit part, and a shielding plate is arranged between the motor part and the circuit part.

2. The brush motor of claim 1, wherein the shield plate has a first opening, the filter circuit structure is connected to the motor coil through the first opening, the circuit portion has a second opening at an outer end thereof, and the first opening and the second opening are offset from each other by 180 degrees with respect to a central axis of the circuit portion.

3. The brush motor according to claim 1, wherein the filter circuit structure includes a power input portion, a common mode choke, and a motor connection portion, the power input portion being connected to the common mode choke, the common mode choke being connected to the motor connection portion;

the power input part comprises a first capacitor, a second capacitor and a transient diode, one end of the first capacitor and one end of the second capacitor are grounded, the other end of the first capacitor and the other end of the second capacitor are respectively connected with two ends of the transient diode, and two ends of the transient diode are respectively connected with two ends of the power input end and two ends of the common mode choke coil;

the motor connecting part comprises a third capacitor, a fourth capacitor and a fifth capacitor, one end of the third capacitor and one end of the fourth capacitor are grounded, the other ends of the third capacitor and the fourth capacitor are connected with two ends of the fifth capacitor, and the other two ends of the common mode choke coil and two ends of the motor coil are respectively connected with two ends of the fifth capacitor.

4. The brushed electric machine of claim 3 wherein the first and second capacitors have a capacitance magnitude of 4.7nF, the third and fourth capacitors have a capacitance magnitude of 0.1 μ F, and the fifth capacitor has a capacitance magnitude of 10 μ F.

5. A brush motor according to claim 3, wherein the filter circuit arrangement is grounded by means of a fixing screw.

Technical Field

The invention relates to the field of machinery, in particular to a brush motor.

Background

The existing vehicle-mounted direct current brush motor is simple in structure, common mode interference signals with wide frequency bands can be generated when the existing vehicle-mounted direct current brush motor conducts transmission (including a voltage method and a current method) and radiates transmission, the characteristics of large range, instability, high peak value and the like are presented in a test frequency spectrum, the test is unqualified, the rectification difficulty is high, and the difficulty of batch production by fusion measures after rectification is finished is also high.

Disclosure of Invention

The technical problem to be solved by the embodiment of the invention is to solve the problems that when the existing vehicle-mounted direct current brush motor is used for conducting transmission (including a voltage method and a current method) and radiation transmission, a common mode interference signal with a wider frequency band is generated, the characteristics of large range, instability, high peak value and the like are presented in a test frequency spectrum, the test is unqualified, the rectification difficulty is higher, and the difficulty of batch production by fusion measures after the rectification is finished is higher.

In order to solve the above problems, an embodiment of the present invention provides a brush motor, which includes a motor housing, a motor coil, and a filter circuit structure;

the motor shell is of a shell structure with an inner space, the inner space of the motor shell comprises a motor part and a circuit part, a motor coil is arranged in the motor part, a filter circuit structure is arranged in the circuit part, and a shielding plate is arranged between the motor part and the circuit part.

Furthermore, be equipped with first opening on the shield plate, the filter circuit structure pass through first opening with motor coil connects, the outside end of circuit part is equipped with the second opening, first opening and the second opening with 180 degrees stagger each other as the center in the axis of circuit part.

Further, the filter circuit structure includes a power input portion, a common mode choke coil, and a motor connection portion, the power input portion being connected to the common mode choke coil, the common mode choke coil being connected to the motor connection portion;

the power input part comprises a first capacitor, a second capacitor and a transient diode, one end of the first capacitor and one end of the second capacitor are grounded, the other end of the first capacitor and the other end of the second capacitor are respectively connected with two ends of the transient diode, and two ends of the transient diode are respectively connected with two ends of the power input end and two ends of the common mode choke coil;

the motor connecting part comprises a third capacitor, a fourth capacitor and a fifth capacitor, one end of the third capacitor and one end of the fourth capacitor are grounded, the other ends of the third capacitor and the fourth capacitor are connected with two ends of the fifth capacitor, and the other two ends of the common mode choke coil and two ends of the motor coil are respectively connected with two ends of the fifth capacitor.

Further, the capacitance of the first capacitor and the capacitance of the second capacitor are 4.7nF, the capacitance of the third capacitor and the capacitance of the fourth capacitor are 0.1 muF, and the capacitance of the fifth capacitor is 10 muF.

Further, the filter circuit structure is grounded through a fixing screw.

Compared with the prior art, this embodiment has brush motor, including motor casing, motor coil and filter circuit structure, motor casing is for having the shell structure of inner space, and motor casing's inner space includes motor part and circuit part, places the motor part in the motor coil, places the circuit part in the filter circuit structure, is equipped with the shield plate between motor part and the circuit part. Through at the shield plate, provide the internal shield compartment for filter circuit, the due performance of filter circuit has been guaranteed to very big degree, has controlled the external electromagnetic interference who produces of motor during operation effectively.

Drawings

FIG. 1 is a schematic structural diagram of a brush motor according to an embodiment;

FIG. 2 is a schematic partial circuit diagram of a brush motor according to an exemplary embodiment;

fig. 3 is a schematic partial structural view of a brush motor according to an embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The direct current brush motor is widely applied to automobiles to realize various functions required in the use process of the automobiles. In many parts of automobiles, such as wipers, power windows, power skylights, power seats, power trunks, power locks, and power mirrors, functions are often implemented using a dc brush motor as an actuator.

The brush motor has the advantages of relatively simple structure, low cost and good starting and braking effects, but has the disadvantages of fast carbon brush abrasion, high maintenance frequency, large noise and poor EMC performance; the brushless motor has the advantages of long service life, no maintenance basically, low noise and better EMC performance, but has the disadvantages of high cost and more power consumption in use.

Most of the motors at the related parts of the automobile still adopt brush motors at present due to various factors such as comprehensive cost, use environment and the like, which brings certain challenges to the electromagnetic compatibility of the whole automobile and related parts.

From the concrete performance of the electromagnetic compatibility test, when the vehicle-mounted direct current brush motor is used for conducting transmission (including a voltage method and a current method) and radiation transmission, a common mode interference signal with a wider frequency band can be generated, the characteristics of large range, instability, high peak value and the like are presented in a test frequency spectrum, the test is unqualified, the rectification difficulty is higher, and the difficulty of batch production by fusion measures after rectification is finished is higher.

To solve the above problem, as shown in fig. 1 and fig. 2, a schematic structural diagram of a brush motor according to an embodiment is provided, which includes a motor housing S10, a motor coil S21, and a filter circuit structure S31;

the motor housing S10 is a housing structure having an internal space, the internal space of the motor housing S10 includes a motor portion S20 and a circuit portion S30, the motor coil S21 is disposed in the motor portion S20, the filter circuit structure S31 is disposed in the circuit portion S30, and a shielding plate S32 is disposed between the motor portion S20 and the circuit portion S30. A shielding plate S32 is designed in the motor casing to provide an internal shielding compartment for a filter circuit structure S31 in a circuit part S30;

in an embodiment of the invention, the shielding plate S32 is provided with a first opening S321, the filter circuit structure S31 is connected to the motor coil S21 through the first opening S321, the outer end of the circuit portion S30 is provided with a second opening S322, and the first opening S321 and the second opening S322 are staggered by 180 degrees with respect to each other by taking a central axis of the circuit portion S30 as a center.

In the embodiment of the invention, the positions of the first opening S321 and the second opening S322 are staggered by 180 degrees, so that crosstalk between a connecting line between the filter circuit structure S31 and a power supply and a connecting line between the filter circuit structure S31 and a brush motor is prevented from generating, and the performance of the filter circuit is reduced;

in an embodiment of the present invention, the filter circuit structure S31 includes a power input portion S311, a common mode choke Z, and a motor connection portion S312, the power input portion S311 is connected to the common mode choke Z, and the common mode choke Z is connected to the motor connection portion S312;

the power input part S311 includes a first capacitor C1, a second capacitor C2, and a transient diode VD, one end of the first capacitor C1 and one end of the second capacitor C2 are grounded, the other end of the first capacitor C1 and the other end of the second capacitor C2 are respectively connected to two ends of the transient diode VD, and two ends of the transient diode VD are respectively connected to two ends of a power supply and two ends of a common mode choke coil Z;

the motor connecting portion S312 includes a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5, one end of the third capacitor C3 and one end of the fourth capacitor C4 are grounded, the other ends of the third capacitor C3 and the fourth capacitor C4 are connected to two ends of the fifth capacitor C5, and two ends of the fifth capacitor C5 are connected to the other two ends of the common mode choke coil Z and two ends of the motor coil S21, respectively.

In the embodiment of the invention, a pi-type filter circuit is formed among the power input part S311, the common mode choke coil Z and the motor connecting part S312, and has a remarkable control effect on external electromagnetic interference of the vehicle-mounted direct current brush motor in a wide range from low frequency to high frequency. The power supply can be a 24VDC power supply, application parameters of the internal structure of the specific filter circuit can be locally adjusted according to the actual working conditions of the motor, such as parameters of voltage, current and the like and different specific electromagnetic compatibility test results.

In an embodiment of the invention, the capacitance of the first capacitor C1 and the second capacitor C2 is 4.7nF, the capacitance of the third capacitor C3 and the fourth capacitor C4 is 0.1 μ F, and the capacitance of the fifth capacitor C5 is 10 μ F.

In an embodiment of the present invention, the filter circuit structure S31 is grounded through a fixing screw S33.

In the embodiment of the invention, the electromagnetic compatibility of the vehicle-mounted direct current brush motor can be effectively improved, the electromagnetic compatibility problem is solved from the product structure and circuit design stage, the product research and development period is shortened, and the product research and development production cost is reduced. The electromagnetic compatibility of the vehicle-mounted direct-current brush motor is greatly improved, the electromagnetic compatibility has good inhibition effects on each frequency band of conduction and radiation emission of the motor in an electromagnetic compatibility test, the compartment is matched with the filter circuit, a series of problems that internal interference sources such as a motor coil S21 are mutually coupled with the filter circuit and the like are reduced, the due performance of the filter circuit is ensured to a great extent, and the electromagnetic interference generated by the motor when working is effectively controlled; secondly, the problem of electromagnetic compatibility is considered in the product design stage, the passing rate of finished product prototype testing can be improved, the period from product research and development to marketing is greatly shortened, and the enterprise time and economic cost are reduced.

The brush motor can reach the indexes of the following table 1 in practical tests by adopting the brush motor of the invention:

conduction emission (voltage method, current method)	GB/T 18655-2018	CLASS 3
			Emission of radiation	GB/T 18655-2018	CLASS 3

TABLE 1 electromagnetic compatibility index

Compared with the prior art, this embodiment has brush motor, including motor casing, motor coil and filter circuit structure, motor casing is for having the shell structure of inner space, and motor casing's inner space includes motor part and circuit part, places the motor part in the motor coil, places the circuit part in the filter circuit structure, is equipped with the shield plate between motor part and the circuit part. Through at the shield plate, provide the internal shield compartment for filter circuit, the due performance of filter circuit has been guaranteed to very big degree, has controlled the external electromagnetic interference who produces of motor during operation effectively.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.