CN213151840U - Circuit for reducing external conduction and radiation interference of direct current brushless motor system - Google Patents
Circuit for reducing external conduction and radiation interference of direct current brushless motor system Download PDFInfo
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- CN213151840U CN213151840U CN202022402610.8U CN202022402610U CN213151840U CN 213151840 U CN213151840 U CN 213151840U CN 202022402610 U CN202022402610 U CN 202022402610U CN 213151840 U CN213151840 U CN 213151840U
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- brushless motor
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- direct current
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Abstract
The utility model discloses a reduce external conduction of direct current brushless motor system and radiation interference's circuit, including brushless motor main part and brushless motor drive circuit, the circuit is still including: and one end of the partition part is connected with the negative pole of the bus of the brushless motor driving circuit, the other end of the partition part is connected with the metal shell of the brushless motor main body, and the metal shell of the brushless motor is used as a coupling part. The utility model discloses in, be connected a set of electric capacity on the generating line negative pole on metal casing and drive circuit, DC brushless motor's metal casing plays the coupling effect, lets harmonic signal flow back as early as possible to the generating line negative pole, reduces external space radiation to the reduction passes through the external conduction of power cord and radiation, prevents to influence other electrical apparatus work, simultaneously because the isolation of electric capacity for DC brushless motor casing does not directly link to each other with the forceful electric power, has guaranteed safety.
Description
Technical Field
The utility model relates to a direct current brushless motor technical field especially relates to a reduce direct current brushless motor system to external conduction and radiation interference's circuit.
Background
The brushless direct current motor is composed of a motor main body and a driver, and is a typical electromechanical integration product. A brushless motor refers to a motor without a brush and a commutator (or a slip ring), which is also called a commutator-less motor. As early as the nineteenth birth, the practical motor produced was brushless, i.e., an ac squirrel cage asynchronous motor, which has been widely used. However, asynchronous motors have a number of insurmountable drawbacks, which have led to slow motor technology development. Transistors were produced in the middle of the last century, and therefore, brushless dc motors using transistor commutation circuits instead of brushes and commutators have been produced. This new brushless motor, called electronically commutated dc motor, overcomes the drawbacks of the first generation brushless motors.
At present, the existing brushless direct current motor has the advantages of silence, energy conservation and the like, and is more and more widely used, but because the brushless direct current motor adopts a switching device to carry out chopping speed regulation on bus voltage, system harmonic is large, and external interference is large through power lines and space radiation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: in order to solve the above problems, a circuit for reducing the external conduction and radiation interference of a dc brushless motor system is proposed.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a reduce the circuit of external conduction of direct current brushless motor system and radiation interference, including brushless motor main part and brushless motor drive circuit, the circuit still including:
and one end of the partition part is connected with the negative pole of the bus of the brushless motor driving circuit, the other end of the partition part is connected with the metal shell of the brushless motor main body, and the metal shell of the brushless motor is used as a coupling part.
As a further description of the above technical solution:
the partition part is selected as a capacitor.
As a further description of the above technical solution:
brushless motor drive circuit carries out the commutation through three half-bridge circuit to input power, then gets into DC brushless motor through three phase lines, just DC brushless motor main part is in the speed governing in-process, needs three half-bridge circuit to chop bus voltage through PWM, changes bus voltage virtual value.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
the utility model discloses in, be connected a set of electric capacity on the generating line negative pole on metal casing and drive circuit, DC brushless motor's metal casing plays the coupling effect, lets harmonic signal flow back as early as possible to the generating line negative pole, reduces external space radiation to the reduction passes through the external conduction of power cord and radiation, prevents to influence other electrical apparatus work, simultaneously because the isolation of electric capacity for DC brushless motor casing does not directly link to each other with the forceful electric power, has guaranteed safety.
Drawings
Fig. 1 illustrates a conventional dc brushless motor system diagram provided in accordance with an embodiment of the present invention;
fig. 2 shows a diagram of an improved motor system provided according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely 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. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a reduce the circuit of external conduction of direct current brushless motor system and radiation interference, including brushless motor main part and brushless motor drive circuit, the circuit is still including:
one end of the partition part is connected with the negative pole of the bus of the brushless motor driving circuit, the other end of the partition part is connected with the metal shell of the brushless motor main body, and the metal shell of the brushless motor is used as a coupling part.
Specifically, as shown in fig. 2, the partition is selected as a capacitor.
Specifically, as shown in fig. 2, the brushless motor driving circuit changes the phase of the input power source through three half-bridge circuits, and then enters the dc brushless motor through three phase lines, and the dc brushless motor main body needs three half-bridge circuits to chop the bus voltage through PWM in the speed regulation process, thereby changing the bus voltage effective value.
The working principle is as follows: during the use, be connected a set of electric capacity on metal casing and drive circuit's the generating line negative pole, DC brushless motor's metal casing plays the coupling effect, lets harmonic signal flow back as early as possible to the generating line negative pole, reduces external space radiation to the reduction is through the external conduction of power cord and radiation, prevents to influence other electrical apparatus work, simultaneously because the isolation of electric capacity for DC brushless motor casing does not directly link to each other with the forceful electric power, has guaranteed safety.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (3)
1. The utility model provides a reduce external conduction of direct current brushless motor system and radiation interference's circuit, including brushless motor main part and brushless motor drive circuit, its characterized in that, the circuit is still including:
and one end of the partition part is connected with the negative pole of the bus of the brushless motor driving circuit, the other end of the partition part is connected with the metal shell of the brushless motor main body, and the metal shell of the brushless motor is used as a coupling part.
2. The circuit for reducing external conduction and radiation interference of a brushless dc motor system according to claim 1, wherein the partition is selected to be a capacitor.
3. The circuit for reducing the external conduction and radiation interference of the dc brushless motor system according to claim 1, wherein the brushless motor driving circuit changes the phase of the input power source through three half-bridge circuits, and then enters the dc brushless motor through three phase lines, and the main body of the dc brushless motor needs three half-bridge circuits to chop the bus voltage through PWM during the speed regulation process, so as to change the effective value of the bus voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022402610.8U CN213151840U (en) | 2020-10-26 | 2020-10-26 | Circuit for reducing external conduction and radiation interference of direct current brushless motor system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022402610.8U CN213151840U (en) | 2020-10-26 | 2020-10-26 | Circuit for reducing external conduction and radiation interference of direct current brushless motor system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213151840U true CN213151840U (en) | 2021-05-07 |
Family
ID=75723113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022402610.8U Active CN213151840U (en) | 2020-10-26 | 2020-10-26 | Circuit for reducing external conduction and radiation interference of direct current brushless motor system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213151840U (en) |
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2020
- 2020-10-26 CN CN202022402610.8U patent/CN213151840U/en active Active
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