CN109995192B - Motor and blowing and sucking machine - Google Patents
Motor and blowing and sucking machine Download PDFInfo
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- CN109995192B CN109995192B CN201711489759.0A CN201711489759A CN109995192B CN 109995192 B CN109995192 B CN 109995192B CN 201711489759 A CN201711489759 A CN 201711489759A CN 109995192 B CN109995192 B CN 109995192B
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- 238000007664 blowing Methods 0.000 title claims abstract description 11
- 230000007935 neutral effect Effects 0.000 claims description 8
- 238000010892 electric spark Methods 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 229910002804 graphite Inorganic materials 0.000 description 6
- 239000010439 graphite Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RSMUVYRMZCOLBH-UHFFFAOYSA-N metsulfuron methyl Chemical compound COC(=O)C1=CC=CC=C1S(=O)(=O)NC(=O)NC1=NC(C)=NC(OC)=N1 RSMUVYRMZCOLBH-UHFFFAOYSA-N 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
- H02K13/14—Circuit arrangements for improvement of commutation, e.g. by use of unidirectionally conductive elements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Current Collectors (AREA)
- Dc Machiner (AREA)
Abstract
The invention relates to a motor and a blowing and sucking machine. The motor comprises a motor circuit, a commutator, a first brush group, a second brush group and a switch unit, wherein the first brush group and the second brush group respectively comprise two brushes, and the switch unit is used for connecting the first brush group into the motor circuit and disconnecting the second brush group from the motor circuit when the motor rotates positively, and connecting the second brush group into the motor circuit and disconnecting the first brush group from the motor circuit when the motor rotates reversely; the included angle between the first electric brush group and the commutator is a first deflection angle, and the included angle between the second electric brush group and the commutator is a second deflection angle. The invention uses a group of electric brushes when the motor rotates forward and rotates backward, ensures that the borrowing angle of the electric brushes can be maintained at a preset ideal angle no matter the motor rotates forward or rotates backward, inhibits electric spark when the motor rotates forward or rotates backward, and prolongs the service life of the motor.
Description
Technical Field
The invention relates to a motor, in particular to a brush of the motor, and also relates to a motor of a blowing and sucking machine.
Background
Mechanical wear exists between the brushes and the commutator of the motor, and serious sparks can be generated if the brushes are improperly used, so that the service life of the motor is influenced. Referring to fig. 2, when the armature winding is energized, a magnetic field is generated around the armature 10, which, when combined with the main magnetic field, distorts the main magnetic field relative to the main magnetic field prior to combination, such that the geometric neutral 11 of the main magnetic field is offset from the physical neutral 13. In order to suppress the spark, it is therefore necessary to suppress the reactive potential generated during the commutation, for example, the brushes may be arranged at an angle to the physical neutral line of the commutator, which is called the borrowing angle.
For a forward and reverse rotation motor, the optimal deflection angles are different during forward rotation and reverse rotation of the motor, so that the brushes cannot simultaneously consider the deflection angles during forward rotation and reverse rotation. One solution is to rotate the brush-holder with a mechanical structure to achieve the desired yaw angle for both the forward and reverse rotation of the motor. But this results in a more complex mechanical structure of the motor and thus a greater limitation.
Disclosure of Invention
Accordingly, it is necessary to provide a novel motor capable of achieving a desired yaw angle of the brush both in forward and reverse rotation of the motor.
The motor comprises a motor circuit, a commutator, a first brush group, a second brush group and a switch unit, wherein the first brush group and the second brush group respectively comprise two brushes, the switch unit is used for connecting the first brush group into the motor circuit and disconnecting the second brush group from the motor circuit when the motor rotates positively, and is also used for connecting the second brush group into the motor circuit and disconnecting the first brush group from the motor circuit when the motor rotates reversely; the included angle between the first electric brush group and the commutator is a first deflection angle, and the included angle between the second electric brush group and the commutator is a second deflection angle.
In one embodiment, the switch unit includes a first single-pole double-throw switch and a second single-pole double-throw switch, a first electrode of the motor circuit is connected in series with a rotor coil of the motor and a first brush of a first brush group and then connected to a first stationary end of the first single-pole double-throw switch, a second stationary end of the first single-pole double-throw switch is connected in series with a first brush of the second brush group and a second brush of the first brush group and then connected to a first stationary end of the second single-pole double-throw switch, a stator coil of the motor is connected between the movable end of the first single-pole double-throw switch and the movable end of the second single-pole double-throw switch, one end of the first brush group is also connected with a second stationary end of the second single-pole double-throw switch through a second brush of the second brush group, a second brush of the first group is also connected with a second electrode of the second brush group, and the stator coil of the motor is also connected with a second electrode of the second brush group.
In one embodiment, the motor is an ac motor, the first electrode is an ac hot wire, and the second electrode is an ac neutral wire.
In one embodiment, the motor is a dc motor, the first electrode is positive when the motor is rotating forward, negative when the motor is rotating backward, and the second electrode is negative when the motor is rotating forward, positive when the motor is rotating backward.
In one embodiment, the brushes of the first and second brush sets are carbon brushes.
In one embodiment, the motor further comprises a brush switching module for enabling the first brush group to be contacted with the surface of the commutator and enabling the second brush group to be separated from the surface of the commutator when the motor rotates forwards and enabling the second brush group to be contacted with the surface of the commutator and enabling the first brush group to be separated from the surface of the commutator when the motor rotates reversely
In one embodiment, the commutator is a commutator coil.
In one embodiment, the range of the first lending angle and the second lending angle is greater than zero degrees and less than or equal to 28 degrees.
The invention also provides a blowing and sucking machine.
The blowing and sucking machine comprises a motor, a first brush group, a second brush group and a switch unit, wherein the motor comprises a motor circuit and a commutator, the first brush group and the second brush group respectively comprise two brushes, the switch unit is used for connecting the first brush group into the motor circuit and disconnecting the second brush group from the motor circuit when the motor rotates positively, and is also used for connecting the second brush group into the motor circuit and disconnecting the first brush group from the motor circuit when the motor rotates reversely; the included angle between the first electric brush group and the commutator is a first deflection angle, and the included angle between the second electric brush group and the commutator is a second deflection angle.
In one embodiment, the switch unit includes a first single-pole double-throw switch and a second single-pole double-throw switch, the first electrode of the motor circuit is connected in series with the rotor coil of the motor and the first brush of the first brush group and then connected to the first stationary end of the first single-pole double-throw switch, the second stationary end of the first single-pole double-throw switch is connected in series with the first brush of the second brush group and the second brush of the first brush group and then connected to the first stationary end of the second single-pole double-throw switch, the stator coil of the motor is connected between the movable end of the first single-pole double-throw switch and the movable end of the second single-pole double-throw switch, the rotor coil is connected with the first end of the first brush group and also connected with the second stationary end of the second single-pole double-throw switch through the second brush of the second brush group, the second brush of the first group is connected with the second stationary end of the second brush of the second single-pole double-throw switch, and the second electrode of the motor is also connected with the second electrode of the second brush group.
In one embodiment, the motor is an ac motor, the first electrode is an ac hot wire, and the second electrode is an ac neutral wire.
In one embodiment, the motor further comprises a brush switching module for enabling the first brush group to be in contact with the surface of the commutator and enabling the second brush group to be separated from the surface of the commutator when the motor rotates in the forward direction, and enabling the second brush group to be in contact with the surface of the commutator and enabling the first brush group to be separated from the surface of the commutator when the motor rotates in the reverse direction.
According to the motor and the blowing and sucking machine, the electric brushes are respectively used when the motor rotates positively and reversely, so that the deflection angles can be independently set for the two electric brushes, the motor can be ensured to be maintained at a preset ideal angle no matter rotating positively or reversely, the electric spark during the forward and reverse rotation of the motor is restrained, and the service life of the motor is prolonged. And the switching of the electric brush is realized through a circuit, so that the universality is better than the prior art realized by using a mechanical structure.
Drawings
FIG. 1 is a schematic diagram of a connection relationship between a first brush set and a second brush set in a motor circuit according to an embodiment of FIG. 1;
FIG. 2 is a schematic illustration of a yaw angle of the motor;
fig. 3 is a schematic structural view of a blower in an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In one embodiment, the motor of the present invention includes a motor circuit, a commutator, a first brush set, a second brush set, and a switching unit, the first brush set and the second brush set each including two brushes. The switch unit is used for connecting the first brush group to the motor circuit and disconnecting the second brush group from the motor circuit when the motor rotates forwards, and is also used for connecting the second brush group to the motor circuit and disconnecting the first brush group from the motor circuit when the motor rotates reversely. The included angle between the first electric brush group and the commutator is a first deflection angle, and the included angle between the second electric brush group and the commutator is a second deflection angle. The first and second lending angles are preset according to empirical values and can restrain reactance potential generated in the reversing process, and are generally between 0 and 28 degrees (i.e. advanced by 0 to 28 degrees along the steering direction).
According to the motor, the group of electric brushes are respectively used when the motor rotates forwards and reversely, so that the deflection angles can be independently set for the two groups of electric brushes, the group of electric brushes are respectively used when the motor rotates forwards and reversely, the fact that the deflection angles of the electric brushes can be maintained at preset ideal angles no matter when the motor rotates forwards or reversely is ensured, electric spark during the forward and reverse rotation of the motor is restrained, and the service life of the motor is prolonged. And the switching of the electric brush is realized through a circuit, so that the universality is better than the prior art realized by using a mechanical structure.
Fig. 1 is a schematic diagram of a connection relationship between a first brush group and a second brush group in a motor circuit according to an embodiment. In the embodiment shown in fig. 1, the switching unit includes a first single pole double throw switch S1 and a second single pole double throw switch S2. The first electrode E1 of the motor circuit is connected in series with the rotor coil C1 of the motor and the first brush B11 of the first brush group and then connected to the first stationary end of the first single-pole double-throw switch S1, and the second stationary end of the first single-pole double-throw switch S1 is connected in series with the first brush B21 of the second brush group and the second brush B12 of the first brush group and then connected to the first stationary end of the second single-pole double-throw switch S2. A stator coil C2 of the motor is connected between the moving end of the first single-pole double-throw switch S1 and the moving end of the second single-pole double-throw switch S2. One end of the rotor coil C1 connected to the first brush B11 of the first brush group is also connected to the second stationary end of the second single pole double throw switch S2 through the second brush B22 of the second brush group. One end of the second brush B12 of the first brush group, which is connected with the first brush B21 of the second brush group, is also connected with the second electrode E2 of the motor circuit, and the polarities of the first electrode E1 and the second electrode E2 are opposite.
When the motor works, the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are synchronously operated, namely when the motor rotates positively, the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are connected to a second fixed end, and an electrode E1, a rotor coil C1, a brush B22, a stator coil C2, a brush B21 and an electrode E2 are sequentially connected to form a loop; when the motor is reversed, the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are connected to the first fixed end, and the electrode E1, the rotor coil C1, the electric brush B11, the stator coil C2, the electric brush B12 and the electrode E2 are sequentially connected to form a loop.
In one embodiment, the motor further comprises a brush switching module for bringing the first brush group into contact with the commutator surface and the second brush group out of contact with the commutator surface when the motor is rotating in a forward direction, and bringing the second brush group into contact with the commutator surface and the first brush group out of contact with the commutator surface when the motor is rotating in a reverse direction. The brush switching module can prevent the non-working brush group from contacting with the commutator, thereby avoiding the short circuit of the rotor coil and the reduction of the power and the efficiency of the motor.
In one embodiment, the brush switch module includes a mechanical structure for bouncing the brush off (i.e., disengaging the brush from the commutator surface by a spring force).
In one embodiment, the electric machine is an ac motor, the first electrode E1 is an ac hot wire, and the second electrode E2 is an ac neutral wire.
In one embodiment, the motor is a direct current motor, the first electrode E1 is positive when the motor is rotating forward, negative when the motor is rotating backward, and the second electrode E2 is negative when the motor is rotating forward, positive when the motor is rotating backward.
In one embodiment, the brushes of the first brush set and the second brush set are carbon brushes, and the carbon brushes may be made of metal graphite, natural graphite, galvanic graphite, or the like. The main materials of the metal graphite can be electrolytic copper and graphite, and other metals such as silver powder, aluminum powder, lead powder and the like can be doped at some time according to the use requirement. The binder of the natural graphite is prepared by adopting asphalt or resin and baking or sintering at 1000 ℃. The main components of the electrochemical graphite are carbon powder materials such as carbon black, coke, graphite and the like, and the electrochemical graphite is converted into microcrystalline artificial graphite through 2500-DEG C high-temperature treatment.
The commutator is a plurality of contact pieces which are wound around the armature to form a circle and are respectively connected with each contact on the rotor, and the electric brush only contacts two contact pieces at any time. In one embodiment, the commutator is a commutating coil.
The invention also provides a blowing and sucking machine, wherein the motor of the blowing and sucking machine comprises a motor circuit, a commutator, a first electric brush group, a second electric brush group and a switch unit, and the first electric brush group and the second electric brush group respectively comprise two electric brushes. The switch unit is used for connecting the first brush group to the motor circuit and disconnecting the second brush group from the motor circuit when the motor rotates forwards, and is also used for connecting the second brush group to the motor circuit and disconnecting the first brush group from the motor circuit when the motor rotates reversely. The included angle between the first electric brush group and the commutator is a first deflection angle, and the included angle between the second electric brush group and the commutator is a second deflection angle. The first and second lending angles are preset according to empirical values and can restrain reactance potential generated in the reversing process, and are generally between 0 and 28 degrees.
The motor of the blowing and sucking machine respectively uses one group of electric brushes during forward rotation and reverse rotation, so that the deflection angles can be independently set for the two groups of electric brushes, the deflection angles of the electric brushes can be maintained at a preset ideal angle during forward rotation or reverse rotation of the motor, electric sparks during forward rotation and reverse rotation of the motor are restrained, and the service life of the motor is prolonged. And the switching of the electric brush is realized through a circuit, so that the universality is better than the prior art realized by using a mechanical structure.
In the embodiment shown in fig. 1, the switching unit includes a first single pole double throw switch S1 and a second single pole double throw switch S2. The first electrode E1 of the motor circuit is connected in series with the rotor coil C1 of the motor and the first brush B11 of the first brush group and then connected to the first stationary end of the first single-pole double-throw switch S1, and the second stationary end of the first single-pole double-throw switch S1 is connected in series with the first brush B21 of the second brush group and the second brush B12 of the first brush group and then connected to the first stationary end of the second single-pole double-throw switch S2. A stator coil C2 of the motor is connected between the moving end of the first single-pole double-throw switch S1 and the moving end of the second single-pole double-throw switch S2. One end of the rotor coil C1 connected to the first brush B11 of the first brush group is also connected to the second stationary end of the second single pole double throw switch S2 through the second brush B22 of the second brush group. One end of the second brush B12 of the first brush group, which is connected with the first brush B21 of the second brush group, is also connected with the second electrode E2 of the motor circuit, and the polarities of the first electrode E1 and the second electrode E2 are opposite.
When the motor works, the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are synchronously operated, namely when the motor rotates positively, the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are connected to a second fixed end, and an electrode E1, a rotor coil C1, a brush B22, a stator coil C2, a brush B21 and an electrode E2 are sequentially connected to form a loop; when the motor rotates reversely, the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are connected to the first fixed end, and the electrode E1, the rotor coil C1, the electric brush B11, the stator coil C2, the electric brush B12 and the electrode E2 are sequentially connected to form a loop.
FIG. 3 is a schematic diagram of a blower in an embodiment, with a motor 110 located inside the blower.
In one embodiment, the motor is an ac motor, the first electrode E1 is an ac hot wire, and the second electrode E2 is an ac neutral wire.
In one embodiment, the motor further comprises a brush switching module for bringing the first brush set into contact with the commutator surface and the second brush set out of contact with the commutator surface when the motor is rotating in a forward direction and bringing the second brush set into contact with the commutator surface and the first brush set out of contact with the commutator surface when the motor is rotating in a reverse direction. The brush switching module can prevent the non-working brush group from contacting with the commutator, thereby avoiding the short circuit of the rotor coil and the reduction of the power and the efficiency of the motor.
In one embodiment, the brush switch module includes a mechanical structure for bouncing the brush off (i.e., disengaging the brush from the commutator surface by a spring force).
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. The motor comprises a motor circuit and a commutator, and is characterized by further comprising a first brush group, a second brush group and a switch unit, wherein the first brush group and the second brush group respectively comprise two brushes, and the switch unit is used for connecting the first brush group into the motor circuit and disconnecting the second brush group from the motor circuit when the motor rotates positively, and is also used for connecting the second brush group into the motor circuit and disconnecting the first brush group from the motor circuit when the motor rotates reversely; the included angle between the first electric brush group and the commutator is a first deflection angle, and the included angle between the second electric brush group and the commutator is a second deflection angle;
the switch unit comprises a first single-pole double-throw switch and a second single-pole double-throw switch, wherein a first electrode of a motor circuit is connected with a rotor coil of the motor and a first electric brush of a first electric brush group in series and then is connected to a first fixed end of the first single-pole double-throw switch, a second fixed end of the first single-pole double-throw switch is connected with a first electric brush of a second electric brush group and a second electric brush of the first electric brush group in series and then is connected to a first fixed end of the second single-pole double-throw switch, a stator coil of the motor is connected between a moving end of the first single-pole double-throw switch and a moving end of the second single-pole double-throw switch, one end of the first electric brush group is also connected with a second fixed end of the second single-pole double-throw switch through a second electric brush of the second electric brush group, one end of the first electric brush group is also connected with a first fixed end of the second electric brush group, and the first electrode of the first electrode and the second electrode of the motor are opposite in polarity.
2. The electric machine of claim 1 wherein the electric machine is an ac motor, the first electrode is an ac hot wire, and the second electrode is an ac neutral wire.
3. The electric machine of claim 1, wherein the electric machine is a direct current motor, the first electrode is positive when the electric machine is rotating forward, negative when the electric machine is rotating backward, the second electrode is negative when the electric machine is rotating forward, positive when the electric machine is rotating backward.
4. The electric machine of claim 1, further comprising a brush switching module for bringing the first brush set into contact with the commutator surface, the second brush set out of contact with the commutator surface, and bringing the second brush set into contact with the commutator surface, the first brush set out of contact with the commutator surface, when the electric machine is rotating in a forward direction.
5. The electric machine of claim 1, wherein the commutator is a commutating coil.
6. The electric machine of claim 1, wherein the first and second lending angles range from greater than zero degrees to less than or equal to 28 degrees.
7. The blowing and sucking machine comprises a motor, wherein the motor comprises a motor circuit and a commutator, and is characterized by further comprising a first brush group, a second brush group and a switch unit, wherein the first brush group and the second brush group respectively comprise two brushes, and the switch unit is used for connecting the first brush group into the motor circuit and disconnecting the second brush group from the motor circuit when the motor rotates positively, and connecting the second brush group into the motor circuit and disconnecting the first brush group from the motor circuit when the motor rotates reversely; the included angle between the first electric brush group and the commutator is a first deflection angle, and the included angle between the second electric brush group and the commutator is a second deflection angle;
the switch unit comprises a first single-pole double-throw switch and a second single-pole double-throw switch, wherein a first electrode of the motor circuit is connected with a rotor coil of the motor and a first brush of a first brush group in series and then is connected to a first fixed end of the first single-pole double-throw switch, a second fixed end of the first single-pole double-throw switch is connected with a first brush of a second brush group and a second brush of the first brush group in series and then is connected to a first fixed end of the second single-pole double-throw switch, a stator coil of the motor is connected between a moving end of the first single-pole double-throw switch and a moving end of the second single-pole double-throw switch, one end of the first brush group is connected with a second fixed end of the second single-pole double-throw switch through a second brush of the second brush group, one end of the first brush group is connected with a first fixed end of the second brush group is also connected with a first fixed end of the motor, and the first electrode of the motor is opposite in polarity.
8. The blower of claim 7, further comprising a brush switching module for bringing the first brush set into contact with the commutator surface and the second brush set out of contact with the commutator surface when the motor is rotating in a forward direction, and bringing the second brush set into contact with the commutator surface and the first brush set out of contact with the commutator surface when the motor is rotating in a reverse direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711489759.0A CN109995192B (en) | 2017-12-29 | 2017-12-29 | Motor and blowing and sucking machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711489759.0A CN109995192B (en) | 2017-12-29 | 2017-12-29 | Motor and blowing and sucking machine |
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| Publication Number | Publication Date |
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| CN109995192A CN109995192A (en) | 2019-07-09 |
| CN109995192B true CN109995192B (en) | 2024-04-09 |
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| CN (1) | CN109995192B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020163259A1 (en) * | 1999-12-17 | 2002-11-07 | Ricoh Company, Ltd. | DC motor |
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