CN2785240Y - Permanent magnet DC motor - Google Patents
Permanent magnet DC motor Download PDFInfo
- Publication number
- CN2785240Y CN2785240Y CNU2005201280701U CN200520128070U CN2785240Y CN 2785240 Y CN2785240 Y CN 2785240Y CN U2005201280701 U CNU2005201280701 U CN U2005201280701U CN 200520128070 U CN200520128070 U CN 200520128070U CN 2785240 Y CN2785240 Y CN 2785240Y
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- CN
- China
- Prior art keywords
- end cap
- casing
- electromagnetic interference
- cavity
- permanent magnet
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- 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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Abstract
The utility model relates to a motor, particularly a permanent magnet DC motor with an electromagnetic interference suppressing circuit, which comprises a shell, a bearing which is arranged in the shell, a permanent magnet stator which is composed of two pieces of magnetic steel, a rotor which is composed of a rotating shaft, a rotor piece and a commutator and a end cover which is connected with the shell, wherein a end cover chamber is arranged in the end cover, an electric brush assembly is arranged in the end cover chamber, the electromagnetic interference suppressing circuit is also arranged in the end cover chamber and has at least three terminals, one of the three terminals is connected with the electric brush assembly, another terminal is connected with the shell through the end cover and the last terminal is connected with an external power source. A multipole voltage dependent resistor is also arranged on the rotor. The utility model has the advantages of compact structure and favorable electromagnetic interference suppressing capacity, when the utility model works, the mechanical noise is low.
Description
Affiliated technical field
The utility model relates to a kind of motor, especially a kind of permanent magnet direct current motor that has electromagnetic interference suppression circuit.
Background technology
CISPR (IEC) has formulated " about the limit and the method for the measurement of the radio interference characteristic of the protection of the receiver that uses " standard on vehicle, be used for protecting vehicle-mounted receiver to avoid the interference by conduction and radiation generation that occurs at vehicle.Usually to reduce the interference of motor, can increase to shield to wait and realize by motor is increased capacitor.Typically, connect capacitor between Terminal of motor, or wiring board is installed on motor, suppression element is installed in the circuit board.Along with the use of motor at automotive field, the structural requirement of motor is compact more, and the requirement that electromagnetic interference suppresses (EMI) also day by day improves.In addition, by wanting tile-shaped magnet steel in the fixed motor, how to rush to two grooves and bend into wing shape again on casing, the machinery noise of motor easily leaks from the hole.
Summary of the invention
For the structure that makes motor is compact more, and further improves its electromagnetic interference and suppress ability, the utility model provides a kind of magnetic DC motor.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of permanent magnet direct current motor, comprise casing, and be contained in the bearing in the casing; Two permanent-magnet stators that magnet steel is formed; Rotor with rotating shaft, rotor sheet, commutator composition; The end cap that is connected with casing, in end cap, be provided with end cap cavity, brush assembly of electric is installed in the end cap cavity, also be provided with electromagnetic interference suppression circuit in the described end cap cavity, electromagnetic interference suppression circuit has three terminals at least, one of them terminal links to each other with brush assembly of electric, and another terminal passes end cap and is connected with casing, and another terminal links to each other with external power supply; Also be provided with multipole piezo-resistance on the described rotor.
In order to simplify the end cap cavity structure, it is more firm that circuit element is installed in chamber, further: the chamber of the as a whole moulding of described end cap cavity, bottom end cap cavity, have and be provided with sagging cavity, be provided with narrow meshed boss at the cavity opening part, the end cap cavity circumference is provided with draw-in groove; Electromagnetic interference suppression circuit is arranged in the cavity, and a terminal passes draw-in groove and stretches out end cap and the welding of casing outer wall, and a terminal passes aperture is derived end cap.
Suppress requirement in order to make electrical motors arrive higher radio interference, further again: described electromagnetic interference suppression circuit is two groups, every group of electromagnetic interference suppression circuit comprises the magnetic bead of one 8.2 μ H inductance, 0.33 a μ F electric capacity and two Ferrite Materials, two magnetic beads are arranged at the inductance two ends, and bypass connects electric capacity.
Be fixing magnet steel, on casing, slot usually, the leakage of noise when reducing motor operation, further: be provided with projection and U type jump ring at casing inner wall, two magnet steel in the casing are fixed on casing inner wall by projection and U type jump ring respectively.
The beneficial effects of the utility model are, compact conformation has good electromagnetic interference and suppresses ability, and machinery noise is low during work.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the utility model structural representation.
Fig. 2 is the utility model end cap perspective view.
Fig. 3 is the end cap cavity structural representation of the utility model end cap axis aspect.
Fig. 4 is the A-A cutaway view of Fig. 3.
Fig. 5 is the B-B cutaway view of Fig. 3.
Fig. 6 is the structural representation behind the utility model end cap interior installation electromagnetic interference suppression circuit and the brush assembly of electric.
Fig. 7 is the utility model rotor structure schematic diagram.
Fig. 8 is the fixed structure schematic diagram of the utility model magnet steel at casing inner wall.
Fig. 9 is the circuit diagram of the utility model electromagnetic interference suppression circuit.
1. casings among the figure, 2. permanent-magnet stator, 2-1. bearing, 2-2. magnet steel, 3. rotor, 3-1. rotating shaft, 3-2. rotor sheet, 3-3. commutator, 3-4. multipole piezo-resistance, 4. end cap, 5. end cap cavity, 5-1. cavity, 5-2. boss, 5-3. aperture, 5-4. draw-in groove, 6. brush assembly of electric, 7. electromagnetic interference suppression circuit, 8.9.10. terminal, 11. projectioies, 12.U type jump ring, L. inductance, C. electric capacity, Z. magnetic bead.
Embodiment
As Fig. 1, Fig. 6, permanent magnet direct current motor shown in Figure 7, comprise casing 1, be contained in the bearing 2-1 in the casing 1; Two permanent-magnet stators 2 that magnet steel 2-2 forms, magnet steel 2-2 quantity is two, is provided with projection 11 and U type jump ring 12 at casing 1 inwall, each magnet steel 2-2 is fixed on casing 1 inwall by projection 11 and U type jump ring 12 respectively; Has the rotor 3 that rotating shaft 3-1, rotor sheet 3-2, commutator 3-3 and multipole piezo-resistance 3-4 form; The end cap 4 that is connected with casing 1, in end cap 4, be provided with end cap cavity 5, as shown in Figure 3, brush assembly of electric 6 is installed in the end cap cavity 5, also be provided with electromagnetic interference suppression circuit 7 in the described end cap cavity 5, electromagnetic interference suppression circuit 7 has three terminals 8,9,10 at least, and terminal 8 links to each other with brush assembly of electric 6, terminal 9 passes end cap 4 and is connected with casing 1, and terminal 10 links to each other with external power supply.
To shown in Figure 5, the end cap of end cap 4 as a whole moulding has in end cap cavity 5 bottoms to be provided with sagging cavity 5-1 as Fig. 2, is provided with the boss 5-2 of band aperture 5-3 at cavity 5-1 opening part, and end cap cavity 5 circumference are provided with draw-in groove 5-4; Electromagnetic interference suppression circuit 7 is arranged in the cavity 5-1, and terminal 9 passes draw-in groove 5-4 and stretches out end cap 4 and the welding of casing 1 outer wall, and terminal 10 passes aperture 5-3 and derives end cap 4.
Particularly, electromagnetic interference suppression circuit 7 is two groups, its circuit structure as shown in Figure 9, every group of electromagnetic interference suppression circuit comprises an inductance L, a capacitor C and two magnetic bead Z, two magnetic bead Z are arranged at the inductance L two ends, bypass connects capacitor C.Wherein: magnetic bead Z is a Ferrite Material, and inductance L is 8.2 μ H, and capacitor C is 0.33 μ F.
Suppressing principle is:
1, after the energising, because rotor 3 produces high induced potential, the moment that brush back and commutator 3-3 notch disengage, form high surge voltage, produce arc discharge.Be connected in parallel on the multipole piezo-resistance 3-4 on the rotor commutator 3-3 this moment, then enters conducting state, thereby absorb the commutation surge voltage, prevents due to voltage spikes;
2, inductance L and capacitor C form a LB type composite filter, and common mode shunt capacitance C ground connection is suppressed the wideband interference in the power line simultaneously;
3, magnetic bead Z is a Ferrite Material, high frequency by the time generate heat, absorb energy, high-frequency interferencing signal is played inhibitory action.
By above-mentioned inhibition circuit, the inhibition that electrical motors has arrived GM motor corporation requires:
1, conduction transient emission: ISO 7637-2:20044.3 bar: ± 40V;
2, radiated emission: GWM3097:20043.3.1:LEVEL 5.
Claims (5)
1. a permanent magnet direct current motor comprises casing (1), is contained in the bearing (2-1) in the casing (1); The permanent-magnet stator (2) that two magnet steel (2-2) are formed; Rotor (3) with rotating shaft (3-1), rotor sheet (3-2), commutator (3-3) composition; The end cap (4) that is connected with casing (1), in end cap (4), be provided with end cap cavity (5), brush assembly of electric (6) is installed in the end cap cavity (5), it is characterized in that: also be provided with electromagnetic interference suppression circuit (7) in the described end cap cavity (5), electromagnetic interference suppression circuit (7) has three terminals (8,9,10) at least, terminal (8) links to each other with brush assembly of electric (6), and terminal (9) passes end cap (4) and is connected with casing (1), and terminal (10) links to each other with external power supply; Also be provided with multipole piezo-resistance (3-4) on the described rotor (3).
2. permanent magnet direct current motor according to claim 1, it is characterized in that: the end cap of the as a whole moulding of described end cap (4), bottom end cap cavity (5), have and be provided with sagging cavity (5-1), be provided with the boss (5-2) of being with aperture (5-3) at cavity (5-1) opening part, end cap cavity (5) circumference is provided with draw-in groove (5-4); Electromagnetic interference suppression circuit (7) is arranged in the cavity (5-1), and terminal (9) passes draw-in groove (5-4) and the welding of casing (1) outer wall, and terminal (10) passes aperture (5-3) and derives end cap (4).
3. permanent magnet direct current motor according to claim 1, it is characterized in that: described electromagnetic interference suppression circuit (7) is two groups, every group of electromagnetic interference suppression circuit comprises an inductance (L), an electric capacity (C) and two magnetic beads (Z), two magnetic beads (Z) are arranged at inductance (L) two ends, and bypass connects electric capacity (C).
4. permanent magnet direct current motor according to claim 1, it is characterized in that: described magnet steel (2-2) quantity is two, be provided with projection (11) and U type jump ring (12) at casing (1) inwall, each magnet steel (2-3) is fixed on casing (1) inwall by projection (11) and U type jump ring (12) respectively.
5. permanent magnet direct current motor according to claim 3 is characterized in that: described magnetic bead (Z) is a Ferrite Material, and inductance (L) is 8.2 μ H, and electric capacity (C) is 0.33 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201280701U CN2785240Y (en) | 2005-10-14 | 2005-10-14 | Permanent magnet DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201280701U CN2785240Y (en) | 2005-10-14 | 2005-10-14 | Permanent magnet DC motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2785240Y true CN2785240Y (en) | 2006-05-31 |
Family
ID=36772201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005201280701U Expired - Fee Related CN2785240Y (en) | 2005-10-14 | 2005-10-14 | Permanent magnet DC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2785240Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036364A (en) * | 2011-10-04 | 2013-04-10 | 株式会社电装 | Starter including noise reduction filter |
-
2005
- 2005-10-14 CN CNU2005201280701U patent/CN2785240Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036364A (en) * | 2011-10-04 | 2013-04-10 | 株式会社电装 | Starter including noise reduction filter |
| CN103036364B (en) * | 2011-10-04 | 2015-02-25 | 株式会社电装 | Starter including noise reduction filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060531 Termination date: 20111014 |