CN204794452U - DC Brushless motor of mold pressing resin shell - Google Patents
DC Brushless motor of mold pressing resin shell Download PDFInfo
- Publication number
- CN204794452U CN204794452U CN201520458907.2U CN201520458907U CN204794452U CN 204794452 U CN204794452 U CN 204794452U CN 201520458907 U CN201520458907 U CN 201520458907U CN 204794452 U CN204794452 U CN 204794452U
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- CN
- China
- Prior art keywords
- shell
- mold pressing
- motor
- brushless motor
- stator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Brushless Motors (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The utility model discloses a bearing that DC Brushless motor of mold pressing resin shell, mould moulded the motor can not be by the galvano -cautery, and DC Brushless motor of mold pressing resin shell contains a stator, the stator core of stator goes up around there being the coil, and the shell that is formed by unsaturated polyester resin covers the skin at the motor, and the moulding resin has insulating property, and telluric electricity field comprises the metal, be connected to stator core through metal bracket and shell on, the electric current flows past stator core and bracket arrival outside like this to prevent the degradation of galvano -cautery and bearing.
Description
Technical field
The utility model relates to a kind of coining motor, is specifically related to a kind of DC brushless motor of mold pressing resin shell.
Background technology
Existing coining motor, has a kind of outer casing mold using mold pressing resin shaping on stator, in the enclosure, stator core is wound with coil, and at the rotor that medial surface has bearing fixing.
About above-mentioned coining motor, because the skin of above-mentioned coining motor covers the mold pressing resin of one deck insulation, under it is generally used for low voltage situation, so do not have the problem of worry about ground connection in the past.
But, coining motor will be used for the operation of high voltage and PWM control sometimes, distribution due to capacity cell each in motor and the change in voltage (dv/dt) from PWM, cause stator electric charge to flow to rotor by bearing from stator and form electric current, thus electrochemical corrosion is caused to motor and may bearing be damaged.
As shown in Figure 2, coining motor 100 be high pressure and PWM control time, a kind of insulation unsaturated polyester resin is used as mold pressing resin, produce electric current for above-mentioned reasons, by stator core 102, stator coil 104, bearing 106, rotation axis 108 and rotor 110, finally get back to stator core 102; In this case, the galvano-cautery deterioration that electric power is produced by bearing 106 will damage bearing.
Utility model content
Problem to be solved in the utility model is to provide a kind of DC brushless motor, and the bearing of this DC brushless motor need not experience galvano-cautery; Motor be molded resin cover, electric current can not flow to bearing from stator.
For solving the problem, the utility model provides following scheme:
A DC brushless motor for mold pressing resin shell, comprising:
A stator, stator core is wound with coil;
A shell, containing a bottom, is made up of a kind of mold pressing resin comprising electrical insulating property resin and unsaturated polyester resin, covers described stator outer;
The metal bracket of a ring-type, covers the opening of described shell, is arranged in described shell another side;
Rotor, free to rotate, be the rotation axis being inserted into described rotor by pair of bearings;
Also comprise at least one bearing, be fixed on the center of described bracket;
A grounding electrode be made of metal, has first end and the second end, and first end is connected on described stator core by described shell, and the second end is connected with described bracket, and earth connection is arranged on described bracket and described grounding electrode.
Described motor is that PWM controls, when operating in high voltage, electric current is had to produce in described stator core, and flow to described metal bracket by described grounding electrode, ground is being flow to by earth connection, prevent the current flowing from described stator core to described rotation axis by described pair of bearings thus, thus obtain a relatively low voltage, avoid electrochemical corrosion.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and example, technical solutions of the utility model are further illustrated:
Fig. 1 is the longitudinal sectional view of the DC brushless motor of the utility model mold pressing resin shell;
Fig. 2 is the longitudinal sectional view of existing coining motor.
Embodiment
With reference to Fig. 1, a specific embodiment of the present utility model is described, Fig. 1 is the longitudinal sectional view of the present embodiment coining motor 10.
The utility model coining motor 10, is covered by a kind of insulating resin, and pre-mould portion 13 is applied on the cylindrical stator iron core 12 of laminated steel, and it is also used as insulating barrier; Then, coil 16 is wrapped on the ledge 14 in pre-mould portion 13.
The drive circuit of coining motor 10 is arranged on control board 18, and control board 18 is arranged on (first half as shown in Figure 1) of stator core 12, and in this case, pre-mould portion 13 is provided with preset holes, is convenient to control board 18 and is fixed by the mode of grafting.
One is arranged on control board 18 for the connector 20 sending signal.
The stator coil 16 of described stator 22 is wrapped on stator core 12, control board 18 as above and connector 20, the independent rack 24 be made of metal all is positioned at the metal die of a resin forming, then loaded in a monolithic case made with mold pressing resin, in this case, the unsaturated polyester resin with electrical insulating property can be used as mold pressing resin.
As above in the cylindrical shell body space 28 that shell 26 is formed, placed rotatable rotor 36; Upper bearing (metal) 30 and lower bearing 32 are arranged on upper and lower respectively, and they belong to rotation axis 34 and rotor 36 respectively, and in this case, upper bearing (metal) 30 is fixed by bracket 24.
Rotor 36 is placed in shell space 28, and the another side of plate-type metal bracket 38 is fixed to the junction of enclosure bottom; Bearing 32 is inserted into the sunk part that bracket 38 center is formed.
Grounding electrode 40 is made of metal, and passes from the periphery of metal bracket 38, and to junction with stator core 12 of shell 26, in this case, grounding electrode need arrange a perforation, and this perforation can be pre-formed formed in mould time; Described hole also corresponding position can be formed on stator core 12, and in addition, can carry out mold pressing resin when grounding electrode 40 is fixed on stator core 12 shaping.
Earth connection 44 is installed between grounding electrode 40 and bracket 38, and to be connected to outside, in addition, the ground (earthing potential) of grounding electrode 40 and control board 18 can not be electrically connected.
As the coining motor of said structure, if its rotation relies on the drive circuit of control board 18 to provide, use PWM to control, the electric machine structure that the distribution due to capacity cell causes or the change in voltage that PWM controls, may generation current on stator.
As above-mentioned, the utility model relates to a kind of DC brushless motor, by a kind of insulator die pressurizing resin over-mold or encapsulation, resin enclosure contains a bottom and an opening covered by metallic support, common, electrically insulated structures so, electric current can not flow to outside; But flow to the rotation axis 34 of low-voltage by upper bearing (metal) 30, lower bearing 32, thus cause above-mentioned galvano-cautery.
But due to said structure of the present utility model, electric current flows to the periphery of motor by the mode of grounding electrode 40, described mode is connected to stator core 12 and earth connection 44.
In addition, in this case, because grounding electrode 40 and metallic support 38 are electrically connected, electric current flows to outside by earth connection 44 from the charging of metallic support 40, and result, in prior art field, can not be produced by the current channel of upper bearing (metal) 30, lower bearing 32; Therefore, the possible loss of bearing deterioration or the bearing caused due to galvano-cautery can be avoided; In this case, prior art problem is solved, even if control for use PWM, particularly corrosion-prone coining motor.
As described above, the DC brushless motor covered by insulator die pressurizing resin, the first end of grounding electrode 40 is arranged on stator core, the other end is arranged on metallic support 38, even if, the distribution of the capacity cell being controlled the change in voltage that causes by PWM and/or caused due to electric machine structure causes electric current to charge to stator, deterioration or the damage of above-mentioned bearing can not occur, on the contrary, electric current flows to the outside of motor by grounding electrode 40 and earth connection 44 from stator core 12, therefore avoids the galvano-cautery of upper bearing (metal) 30,32.
When mold pressing resin is electrical insulating property unsaturated polyester resin, it can prevent the outflow of electric current on stator core, and above-mentioned structure is the galvano-cautery that possible prevent bearing.
If grounding electrode is metallic screw, it can be arranged on stator core easily, in addition, can replace screw with axle or pin.
Above-described embodiment is used for the description to the DC brushless motor of mold pressing resin shell, but is also applicable to the motor of other types.
Above-described embodiment is used for the description be located at control board 18 in coining motor 10, but control board 18 pages can be fixed on the outside of shell 26, and this motor be not located in shell also can reach effect similar in above-described embodiment.
Above-described is only preferred implementation of the present utility model; should be understood that; for a person skilled in the art; under the prerequisite not departing from the utility model structure; some distortion and improvement can also be made; these also should be considered as protection range of the present utility model, and these all can not affect effect and the practical applicability of the utility model enforcement.
Claims (4)
1. the DC brushless motor of mold pressing resin shell, comprising:
A stator, stator core is wound with coil;
A shell, containing a bottom, is made up of a kind of mold pressing resin comprising electrical insulating property resin and unsaturated polyester resin, covers described stator outer;
The metal bracket of a ring-type, covers the opening of described shell, is arranged in described shell another side;
Rotor, free to rotate, be the rotation axis being inserted into described rotor by pair of bearings;
It is characterized in that,
Also comprise at least one bearing, be fixed on the center of described bracket;
A grounding electrode be made of metal, has first end and the second end, and first end is connected on described stator core by described shell, and the second end is connected with described bracket, and earth connection is arranged on described bracket and described grounding electrode.
2. the DC brushless motor of mold pressing resin shell as claimed in claim 1, it is characterized in that, described grounding electrode is a kind of metallic screw.
3. the DC brushless motor of mold pressing resin shell as claimed in claim 1, it is characterized in that, described grounding electrode is a kind of metallic pin.
4. the DC brushless motor of mold pressing resin shell as claimed in claim 1, is characterized in that, comprise the drive circuit on a control board, be arranged on described motor, controls to drive described motor for using PWM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520458907.2U CN204794452U (en) | 2015-06-30 | 2015-06-30 | DC Brushless motor of mold pressing resin shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520458907.2U CN204794452U (en) | 2015-06-30 | 2015-06-30 | DC Brushless motor of mold pressing resin shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204794452U true CN204794452U (en) | 2015-11-18 |
Family
ID=54534429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520458907.2U Expired - Fee Related CN204794452U (en) | 2015-06-30 | 2015-06-30 | DC Brushless motor of mold pressing resin shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204794452U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109983665A (en) * | 2016-11-30 | 2019-07-05 | 日本电产株式会社 | Motor |
-
2015
- 2015-06-30 CN CN201520458907.2U patent/CN204794452U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109983665A (en) * | 2016-11-30 | 2019-07-05 | 日本电产株式会社 | Motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20160630 |