CN212850169U - Reversing switching structure for motor and electric drill adopting same - Google Patents
Reversing switching structure for motor and electric drill adopting same Download PDFInfo
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- CN212850169U CN212850169U CN202021912611.0U CN202021912611U CN212850169U CN 212850169 U CN212850169 U CN 212850169U CN 202021912611 U CN202021912611 U CN 202021912611U CN 212850169 U CN212850169 U CN 212850169U
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Abstract
The utility model discloses a reversing switching structure used in a motor, which comprises a rotor and a reversing ring arranged on the rotor, wherein the periphery of the reversing ring is provided with a forward carbon brush group and a reverse carbon brush group, the forward carbon brush group comprises a forward carbon brush I and a forward carbon brush II, and the reverse carbon brush group comprises a reverse carbon brush I and a reverse carbon brush II; the positions of the forward carbon brush group and the reverse carbon brush group are designed in a cross mode, the central axis of the reversing ring is used as a reference central point, the central angles between the forward carbon brush I and the forward carbon brush II and between the reverse carbon brush I and the reverse carbon brush II are 180 degrees, and the central angles between the forward carbon brush I and the reverse carbon brush I and between the forward carbon brush II and the reverse carbon brush II are smaller than 90 degrees. The utility model discloses redesign the mounted position and the installation combination of carbon brush, reduce the production of spark on the carbon brush, improve life and reliability, reduce to human health and harm. The utility model also provides an electric drill that adopts above-mentioned structural installation to use.
Description
Technical Field
The utility model relates to the technical field of electric machines, concretely relates to an electric drill that is arranged in switching-over switching structure of motor and adopts this structure.
Background
The motor is applied to tools in various fields in life, the motor on a plurality of tools has a function of forward and reverse rotation when in use, particularly used electric drills or hammer tools, so a reversing device is arranged in the motor and consists of an electric brush and a reversing ring; the brush mostly adopts the carbon brush, and the carbon brush is mainly used for leading the rotor current required by the operation of the motor into the rotor coil through the connection with the commutation ring, providing an excitation power supply and then transmitting the excitation power supply to the rotor, and the rotor of the motor is equivalent to a rotary magnet, and the commutation task of the motor is realized through the carbon brush.
Because the carbon brush always has contact friction with the reversing ring due to the rotation of the rotor, the carbon brush is accompanied with abrasion in long-term relative rotation, so that the influence of uneven contact surface with the reversing ring, insufficient pressure of the carbon brush and other conditions is caused, and the carbon brush is often accompanied with sparking; in the face of the above situation, the contact surface of the carbon brush and the current collecting ring can be polished smoothly by using fine sand paper, or the pressure of the carbon brush can be properly adjusted, so that the probability of sparking of the carbon brush can be effectively reduced.
However, the sparking of the carbon brush is greatly related to the relative installation position between the carbon brush and a reversing ring on a rotor, the existing brush motor is provided with a carbon brush for controlling forward rotation and a carbon brush for controlling reverse rotation, and the central axis of the reversing ring is taken as a reference central point, and the included angle of the circle centers of the two carbon brushes is 180 degrees; when the arrangement of the position can cause the motor to commutate, sparks between the carbon brush and the commutation ring are large, the largest and most direct influence of the sparks of the carbon brush is that the service life of the carbon brush is shortened, and an excitation power supply provided by the contact leading-in between the carbon brush and the commutation ring is unstable, and indirectly, the frequent sparks of the carbon brush can generate more carbon dust, and the harm is caused to health after the human body inhales.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an aim at solving the problem that proposes in the above-mentioned background art, provide a switching-over switching structure and adopt the electric drill of this structure for in the motor, redesign the mounted position and the installation combination of carbon brush, reduce the production of spark on the carbon brush, improve life and reliability, reduce to the health and harm.
In order to achieve the above purpose, the technical scheme of the utility model is that: a reversing switching structure for a motor comprises a rotor and a reversing ring arranged on the rotor, wherein a forward carbon brush group and a reverse carbon brush group are arranged on the circumference of the reversing ring, the forward carbon brush group and the reverse carbon brush group are respectively installed in a contact manner with the reversing ring, the forward carbon brush group comprises a forward carbon brush I and a forward carbon brush II, and the reverse carbon brush group comprises a reverse carbon brush I and a reverse carbon brush II; the positions of the forward carbon brush group and the reverse carbon brush group are designed in a cross mode, the central axis of the reversing ring is used as a reference central point, the central angles between the forward carbon brush I and the forward carbon brush II and between the reverse carbon brush I and the reverse carbon brush II are 180 degrees, and the central angles between the forward carbon brush I and the reverse carbon brush I and between the forward carbon brush II and the reverse carbon brush II are smaller than 90 degrees.
And the forward carbon brush group and the reverse carbon brush group are connected with a switching control switch through a circuit, and the forward carbon brush I and the forward carbon brush II as well as the reverse carbon brush I and the reverse carbon brush II are respectively switched and communicated through the switching control switch.
The switching control switch is connected with a plurality of groups of stator windings through lines, and the stator windings are electrified under the control of the switching control switch.
The stator windings are in four groups, and the four groups of stator windings are respectively corresponding to the positions of the first forward carbon brush, the second forward carbon brush, the first reverse carbon brush and the second reverse carbon brush.
The electric drill with the reversing switching structure comprises a machine shell, a rotor and a stator, wherein the rotor and the stator are installed in the machine shell, an installation base plate is arranged on the machine shell, a first forward carbon brush, a first reverse carbon brush and a second reverse carbon brush are fixedly installed on the installation base plate through the intersection and included angle design of the reversing switching structure, and four groups of stator windings correspond to the positions of the carbon brushes in the front and back mode.
Adopt above technical scheme, the utility model discloses following beneficial effect has:
the forward carbon brush group and the reverse carbon brush group in the utility model are respectively composed of two, the installation positions of the forward carbon brush I, the forward carbon brush II and the reverse carbon brush I and the reverse carbon brush II in the forward carbon brush group adopt cross design, and the cross installation angle is also required, the central axis of the reversing ring is taken as a reference central point for definition, the central angles between the forward carbon brush I and the forward carbon brush II and between the reverse carbon brush I and the reverse carbon brush II are 180 degrees, thereby leading the forward carbon brush group and each carbon brush in the reverse carbon brush group to be symmetrically installed, simultaneously leading the forward carbon brush I and the reverse carbon brush I, the central angle between the forward carbon brush II and the reverse carbon brush II to be less than 90 degrees, leading the position cross installation and the cross included angle design between each carbon brush to lead each carbon brush to provide excitation power supply transmission more stably through the reversing ring when controlling and switching, leading the steering switching of the rotor to be more stable, therefore, sparks between the carbon brushes and the reversing ring during steering switching are effectively reduced, the service life of each carbon brush is prolonged, the generation of carbon dust is reduced, and the health guarantee of operators is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic diagram of the circuit connection of the present invention;
FIG. 3 is a perspective view of an electric drill designed and installed according to the present invention;
FIG. 4 is a perspective view of an electric drill (with the casing removed) for installation and application according to the present invention
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a switching-over switching structure for use in an electric motor, including rotor 1 and a reversing ring 2 arranged on rotor 1, the circumference of reversing ring 2 is provided with a forward carbon brush group and a reverse carbon brush group, the forward carbon brush group and the reverse carbon brush group are respectively installed with the reversing ring in a contact manner, the forward carbon brush group includes a forward carbon brush 3 and a forward carbon brush 4, and the reverse carbon brush group includes a reverse carbon brush 5 and a reverse carbon brush 6; the positions of the forward carbon brush group and the reverse carbon brush group are designed in a cross mode, the central axis of the reversing ring 2 is used as a reference central point, the central angles between the forward carbon brush I3 and the forward carbon brush II 4 and between the reverse carbon brush I5 and the reverse carbon brush II 6 are 180 degrees, and the central angles between the forward carbon brush I3 and the reverse carbon brush I5 and between the forward carbon brush II 4 and the reverse carbon brush II 6 are smaller than 90 degrees.
The utility model discloses in, the center pin of switching-over ring is used as the benchmark central point for forward carbon brush group and reverse carbon brush group, forward carbon brush 3 and forward carbon brush two 4, and the central angle between reverse carbon brush 5 and reverse carbon brush two 6 is 180 degrees, thereby make the carbon brush in forward carbon brush group and the reverse carbon brush group be in the symmetrical installation of switching-over ring 2 circumference relatively, deuterogamy forward carbon brush 3 and reverse carbon brush one 5, the central angle between forward carbon brush two 4 and the reverse carbon brush two 6 is less than 90 degrees, in the moment of control rotor 1 converts into reverse rotation from forward, the carbon brush has stability through the leading-in excitation power supply who provides in the rotor of switching-over ring 2 when making the carbon brush operation, thereby make the rotor switch over the pivoted in the moment and rotate steadily, the rotor switches over the pivoted steadily to guarantee that the contact is stable between switching-over reversing ring and each carbon brush on it, make the even contact between switching-over ring and each carbon brush, Unstable friction between the reversing ring and each carbon brush is reduced, so that the carbon brushes can be prevented from generating larger sparks when the rotor is switched to rotate.
As shown in fig. 2, a switch control switch 7 is connected between the forward carbon brush set and the reverse carbon brush set through a line, and the forward carbon brush one 3 and the forward carbon brush two 4, and the reverse carbon brush one 5 and the reverse carbon brush two 6 are respectively switched and communicated through the switch control switch 7; the on-off of the forward carbon brush group and the reverse carbon brush group is controlled by switching the control switch 7.
The switching control switch 7 is connected with a plurality of groups of stator windings 8 through circuits, the stator windings 8 are electrified under the control of the switching control switch 7, furthermore, the number of the stator windings 8 is four, and the four groups of stator windings 8 are respectively corresponding to the positions of the forward carbon brush I3, the forward carbon brush II 4, the reverse carbon brush I5 and the reverse carbon brush II 6; the stator windings are arranged corresponding to the carbon brushes in position, and the excitation power supply led into the rotor corresponds to the stator windings in position, so that the rotating stability of the rotor during instantaneous switching is further improved, and larger sparks generated between the carbon brushes and the reversing ring during the switching of the rotor in steering are further avoided.
The utility model also provides an electric drill that adopts the installation of above-mentioned switching-over structure to use, as shown in fig. 3, 4, include casing 9, rotor 1, the stator 10 installed in casing 9, be provided with installation bedplate 11 on casing 9, adopt the crossing and contained angle design fixed mounting in installation bedplate 11 between forward carbon brush one 3, reverse carbon brush one 5, reverse carbon brush two 6 among the above-mentioned switching-over structure, four groups of stator windings correspond with the position of each carbon brush from front to back; and current installation mostly adopts to install the carbon brush on stator winding, is combining the utility model relates to a and the fixed mode of installation that adopts improve more when switching the rotor and turn to, the leading-in stability that provides excitation power, the production that reduces the spark of contact between switching-over ring and each carbon brush, can wide application on instruments such as electric hammer.
The reversing switching structure for the motor and the electric drill adopting the structure provided by the embodiment of the invention are described in detail, a specific example is applied to explain the principle and the implementation mode of the utility model, and the description of the above embodiment is only used for helping to understand the technical scheme disclosed by the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (5)
1. The utility model provides a switching-over switching structure for among motor, includes the rotor and locates the switching-over ring on the rotor, its characterized in that: the reversing ring is circumferentially provided with a forward carbon brush group and a reverse carbon brush group, the forward carbon brush group and the reverse carbon brush group are respectively installed in a contact manner with the reversing ring, the forward carbon brush group comprises a forward carbon brush I and a forward carbon brush II, and the reverse carbon brush group comprises a reverse carbon brush I and a reverse carbon brush II; the positions of the forward carbon brush group and the reverse carbon brush group are designed in a cross mode, the central axis of the reversing ring is used as a reference central point, the central angles between the forward carbon brush I and the forward carbon brush II and between the reverse carbon brush I and the reverse carbon brush II are 180 degrees, and the central angles between the forward carbon brush I and the reverse carbon brush I and between the forward carbon brush II and the reverse carbon brush II are smaller than 90 degrees.
2. A commutation switching arrangement for use in an electrical machine according to claim 1, wherein: and the forward carbon brush group and the reverse carbon brush group are connected with a switching control switch through a circuit, and the forward carbon brush I and the forward carbon brush II as well as the reverse carbon brush I and the reverse carbon brush II are respectively switched and communicated through the switching control switch.
3. A commutation switching arrangement for use in an electrical machine according to claim 2, wherein: the switching control switch is connected with a plurality of groups of stator windings through lines, and the stator windings are electrified under the control of the switching control switch.
4. A commutation switching arrangement for use in an electrical machine according to claim 3, wherein: the stator windings are in four groups, and the four groups of stator windings are respectively corresponding to the positions of the first forward carbon brush, the second forward carbon brush, the first reverse carbon brush and the second reverse carbon brush.
5. An electric drill installed and applied by adopting the reversing switching structure of claim 1, which comprises a machine shell, a rotor and a stator, wherein the rotor and the stator are installed in the machine shell, and the electric drill is characterized in that: the machine shell is provided with an installation seat plate, a first forward carbon brush, a first reverse carbon brush, a second forward carbon brush and a second reverse carbon brush are fixedly installed on the installation seat plate by adopting the design of intersection and included angle in the reversing switching structure of claim 1, and four groups of stator windings correspond to the positions of the carbon brushes in front and back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021912611.0U CN212850169U (en) | 2020-09-04 | 2020-09-04 | Reversing switching structure for motor and electric drill adopting same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021912611.0U CN212850169U (en) | 2020-09-04 | 2020-09-04 | Reversing switching structure for motor and electric drill adopting same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212850169U true CN212850169U (en) | 2021-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021912611.0U Active CN212850169U (en) | 2020-09-04 | 2020-09-04 | Reversing switching structure for motor and electric drill adopting same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212850169U (en) |
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2020
- 2020-09-04 CN CN202021912611.0U patent/CN212850169U/en active Active
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