CN109378933B - Planetary gear type brushless direct current motor - Google Patents
Planetary gear type brushless direct current motor Download PDFInfo
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- CN109378933B CN109378933B CN201811437267.1A CN201811437267A CN109378933B CN 109378933 B CN109378933 B CN 109378933B CN 201811437267 A CN201811437267 A CN 201811437267A CN 109378933 B CN109378933 B CN 109378933B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
- H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
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- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
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Abstract
The invention discloses a planetary gear type brushless DC motor, wherein the planetary gear type brushless DC motor comprises: the motor comprises a stator assembly, a rotor assembly, an output mechanism, a control system and a motor shell. The planetary gear type brushless direct current motor combines the planetary gear reducer and the brushless direct current motor, so that the output rotating speed can meet the universal requirement, the transmission efficiency is improved, and the resources are saved.
Description
Technical Field
The invention relates to the field of direct current motors, in particular to a planetary gear type brushless direct current motor.
Background
The brush direct current motor is mechanically commutated by the commutator and the brush device, and the problems of more sparks, easy electromagnetic interference, high operation noise and short operation life can be caused. With the development of electronic components, electronic commutation devices are gradually used to replace mechanical commutation, and brushless dc motors are also developed. When a certain phase of the stator winding of the brushless DC motor is electrified, a magnetic field generated by the phase current interacts with a magnetic field generated by a permanent magnet of the rotor to generate torque, so that the rotor is driven to rotate. The position sensor converts the position of the rotor magnet into an electrical signal to control the electronic switching circuit, so that the windings of the stator are conducted in a certain order, and the phase current of the stator is changed in phase according to the correct order along with the change of the position of the rotor. Therefore, the electronic magnetic field can be continuously changed along with the rotation of the rotor to generate a rotating magnetic field with synchronous rotor rotation speed, the magnetic field of the stator and the magnetic field of the rotor always keep a space angle of about 90 degrees, and the rotor is pushed to rotate by maximum torque. The conducting sequence of the electronic switch circuit is synchronous with the rotor corner, so that the reversing function of the mechanical commutator is achieved, the magnetic fields of the stator and the rotor are always kept basically vertical in the running process of the motor, and the running efficiency is improved. The brushless direct current motor has the advantages of high efficiency, low energy consumption, low noise, ultra-long service life, high reliability, servo control, stepless frequency conversion speed regulation and the like, and is widely applied to various fields.
The planetary gear reducer is a transmission device which applies a planetary transmission principle and adopts gear engagement. The transmission of the planetary gear reducer comprises a sun wheel, planet wheels and a gear ring, wherein the planet wheels are supported by a fixed shaft of a planet carrier, the planet wheels are allowed to rotate on a supporting shaft, and the planet wheels, the sun wheel and the gear ring are in a constant mesh state. The sun gear is positioned at the center of the planetary gear transmission mechanism, the sun gear and the planetary gear are constantly meshed, and the meshing rotating directions of the outer gears are opposite. The gear ring is an internal gear which is meshed with the planet gears, and the rotation directions of the internal gear and the planet gears are the same. The planetary gear reducer achieves the speed reduction effect through meshing between gears, the number of the planet gears depends on the design load of the planetary gear reducer, generally three or four planet gears exist, and the more the number of the planet gears is, the larger the load is born. The most remarkable characteristic of the planetary gear reducer is that power can be split when power is transmitted, and an input shaft and an output shaft are on the same horizontal line. Planetary gear transmissions have been widely used in reduction, speed-increasing and speed-changing devices in various mechanical transmission systems. Particularly, it is widely used in aircrafts and vehicles due to its "high load, large transmission ratio" feature.
The output rotating speed of the traditional brushless direct current motor is often too high, and in the actual use process, the requirement of the rotating speed can be met generally after the traditional brushless direct current motor passes through a planetary gear reducer or other speed reducing equipment, so that the transmission efficiency is obviously reduced, and more resources are consumed.
Disclosure of Invention
In order to overcome the defect that the output rotating speed of the traditional brushless direct current motor is overhigh, the invention provides the planetary gear type brushless direct current motor, the planetary gear type brushless direct current motor combines a planetary gear reducer and a brushless direct current motor, the output rotating speed is enabled to meet the universal requirement, the transmission efficiency is improved, and the resources are saved.
Correspondingly, the embodiment of the invention provides a planetary gear type brushless direct current motor, which comprises a motor shell, a stator assembly, a rotor assembly, an output mechanism and a control system, wherein the stator assembly, the rotor assembly, the output mechanism and the control system are arranged in the motor shell;
the motor shell comprises a motor base and a motor end cover connected with the motor base; a plurality of heat dissipation strip holes are formed in a motor main shell of the motor base and distributed on one side, close to the rotor assembly, of the motor main shell; the motor end cover is provided with a motor end cover radiating strip hole, and the motor end cover radiating strip hole and a plurality of radiating strip holes on the motor main shell form convection;
the stator assembly is coaxially arranged in the motor base and comprises a stator core and a stator winding, the stator core is an integrated part and is formed by stacking a plurality of silicon steel sheets, a first tooth profile is arranged on the inner wall of the stator core, and the stator winding is arranged in the stator core in a preset mode;
the rotor assembly comprises a plurality of planetary gears with second tooth profiles arranged on the peripheries of the planetary gears and a rotor iron core which is coaxial with the stator iron core; the rotor core is of an integral part structure and is formed by combining a plurality of silicon steel sheets with the same shape or different shapes, and permanent magnets are arranged on the rotor core; the rotor core comprises a rotor section, a first rotating shaft section and a second rotating shaft section, the first rotating shaft section and the second rotating shaft section are arranged at two axial ends of the rotor section, a third tooth profile is arranged on the periphery of the rotor section, and the first rotating shaft section is in sliding fit with the motor base; the plurality of planetary gears are arranged between the rotor core and the stator core and are meshed with the rotor core third tooth profile and the stator core first tooth profile respectively based on the second tooth profile;
the output mechanism comprises an output connecting piece which is coaxial with the rotor core, the second rotating shaft section is in sliding fit with the output connecting piece, the input end of the output connecting piece is connected with the plurality of planetary gears, and the output end of the output connecting piece penetrates through the motor end cover to extend outwards;
the control system comprises a position sensor, an electronic commutator and a driver, wherein the position sensor, the electronic commutator and the driver are used for detecting the polarity of the rotor core, the position sensor, the electronic commutator and the driver are arranged on the motor base, and the position sensor and the electronic commutator are respectively connected with the driver.
In an alternative embodiment, the output connection is provided with an annular bearing seat on a side facing the rotor core, and the second shaft section is fitted on the annular bearing seat.
In an alternative embodiment, the motor base and the motor end cover are made of cast iron.
In an alternative embodiment, the planet gear is axially provided with a pin hole.
In an optional implementation manner, the output mechanism further includes a plurality of pin shafts and an output shaft, the pin shafts are respectively disposed on two sides of the output connecting member, the pin shafts are input ends of the output connecting member, the pin shafts respectively extend into pin holes of a plurality of corresponding planetary gears, the output shaft is an output end of the output connecting member, the output shaft and the output connecting member are coaxially disposed, and the output shaft penetrates through the motor end cover and extends outwards.
In an alternative embodiment, the output shaft is provided with a keyway.
In an alternative embodiment, the stator winding is a three-phase stator winding.
In an alternative embodiment, the three-phase stator winding is connected in a star connection mode or a delta connection mode.
In an alternative embodiment, the first tooth profile of the stator core, the second tooth profile of the planetary gear and the third tooth profile of the rotor core are involute tooth profiles.
The embodiment of the invention provides a planetary gear type brushless direct current motor, which combines a sun gear in a planetary gear reducer with a rotor of the brushless direct current motor, avoids the motor from generating eccentricity to cause the motor to break down due to the problems of assembly, abrasion and the like, and has better reliability and better deceleration effect; the outer gear ring in the planetary gear reducer is connected and combined with the stator assembly of the brushless direct current motor, so that the use of parts is reduced, the volume of the motor is reduced, and the utilization rate of space is improved; the direct connection of the rotor assembly and the output mechanism reduces transmission loss and improves transmission efficiency; the arrangement of the motor shell protects the internal components of the motor, and the service life of the motor is prolonged. Therefore, the planetary gear type brushless direct current motor has the advantages of compact structure, small volume, high transmission efficiency and long service life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a three-dimensional structural view of a planetary gear type brushless dc motor in an embodiment of the present invention;
fig. 2 is a partial sectional view of a three-dimensional structure of a planetary gear type brushless dc motor according to an embodiment of the present invention;
fig. 3 is an exploded view of a three-dimensional structure of a planetary gear type brushless dc motor according to an embodiment of the present invention;
FIG. 4 is a three-dimensional structural view of a planetary gear type brushless DC motor stator assembly according to an embodiment of the present invention;
FIG. 5 is a three-dimensional structural view of a planetary gear type brushless DC motor rotor assembly according to an embodiment of the present invention;
fig. 6 is a three-dimensional structural view of an output mechanism of a planetary gear type brushless dc motor in the embodiment of the present invention;
FIG. 7 is a three-dimensional structural view of a motor base in an embodiment of the invention;
fig. 8 is a three-dimensional structural view of a motor end cover in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a three-dimensional structural view of a planetary gear type brushless dc motor in an embodiment of the present invention, fig. 2 is a partial sectional view of a three-dimensional structure of a planetary gear type brushless dc motor in an embodiment of the present invention, and fig. 3 is an exploded view of a three-dimensional structure of a planetary gear type brushless dc motor in an embodiment of the present invention.
The embodiment of the invention provides a planetary gear type brushless direct current motor which comprises a stator assembly 1, a rotor assembly 2, an output mechanism 3 and a motor shell 4. Specifically, a stator assembly 1 is fixed in the motor housing 4, a rotor assembly 2 is arranged inside the stator assembly 1, and the output mechanism 3 is connected with the rotor assembly 2 in a matching manner; the motor housing 4 wraps the stator assembly 1, the rotor assembly 2 and the output mechanism 3, and the motor housing 4 comprises a motor base 5 and a motor end cover 6 connected with the motor base 5.
Fig. 4 is a three-dimensional structural view of a stator assembly of the planetary gear type brushless dc motor in the embodiment of the present invention, and the stator assembly 1 is a stationary part in the planetary gear type brushless dc motor.
The stator assembly 1 includes a stator core 11 and a stator winding (not shown) disposed on the stator core. Generally, the stator core 11 is formed by punching silicon steel sheets into fan-shaped pieces and overlapping the fan-shaped pieces on positioning ribs, the positioning ribs are welded on a shell through a supporting plate, and the core is compressed into a whole through upper and lower tooth pressing plates by using tensioning bolts. In order to avoid the influence of too tight overlapped lines on the view observation, the stator core shown in the embodiment of the invention is an integrated part which is formed by stacking a plurality of silicon steel sheets; compared with the traditional stator structure, the silicon steel sheet of the embodiment of the invention has different shapes aiming at different parts, and the specific outline shape is introduced by referring to the text description and combining the part outline of the attached drawing. The invention mainly aims to realize the functions of simplifying the structure, reducing the volume and the like by organically combining the traditional stator structure and the planetary gear of the traditional planetary gear reducer, in the embodiment of the invention, the basic composition of the stator is similar to that of the existing structure, but the stator structure required by the embodiment of the invention is formed by utilizing the combination of silicon steel sheets with different shapes, which is not possessed by the existing stator structure, and the stator iron core is correspondingly adjusted according to the structural appearance required by the embodiment of the invention. It should be noted that, based on the existing technical conditions and production cost considerations, the stator core needs to be made in the form of silicon steel sheets, but under the support of specific occasions and specific materials, the stator core can be made in the form of a single part as shown in the attached drawings; the specific embodiments show actual situation determinations.
Specifically, the stator core 11 is provided with a plurality of stator trapezoidal through holes 111 for placing stator windings; three-phase windings U, V, W with identical structures in the stator windings are spatially arranged in the trapezoidal through holes 111 of the stator at 120 degrees difference, and the three-phase windings U, V, W can be connected into a star shape or a triangle shape as required. In actual operation, the sequence and timing of energization of the three-phase winding U, V, W windings is controlled by the electronic commutator, which generates a corresponding rotating magnetic field in the stator core 11 based on the circuit information provided by the electronic commutator.
It should be noted that the electronic commutator mainly consists of two parts, namely a power converter and a control circuit, and is matched with a position sensor arranged on the motor base 5 to control the electrifying sequence and time of each phase winding of the motor stator. When the device runs, the position sensor senses the position of the rotor assembly 2 and transmits a position signal to the control circuit, and the control circuit transmits the position signal to the power converter after carrying out logic processing and isolation amplification on the position signal; the power converter receives the control information provided by the control circuit, distributes the power of the system working power supply to each phase winding on the brushless DC motor stator according to a certain logic relation, and each phase winding generates a corresponding rotating magnetic field to drive the rotor assembly 2 to rotate. In addition, in the embodiment of the present invention, the electronic commutator is disposed in the wire box 51 of the motor base 5.
Specifically, the inner wall of the stator core 11 is processed into a first tooth profile distributed along the circumference, where the first tooth profile refers to a tooth profile on inner teeth of the stator core 11, and the first tooth profile is preferably an involute first tooth profile. Specifically, the first tooth profile is matched with the planetary gear. The internal teeth of the stator core 11 are machined by means of gear shaping. It should be noted that gear shaping is a common gear cutting process using a generating method, other than hobbing. The gear shaping cutter and the workpiece are equivalent to the meshing of a pair of cylindrical gears, the reciprocating motion of the gear shaping cutter is the main motion of gear shaping, and the circular motion of the gear shaping cutter and the workpiece in a certain proportional relation is the feeding motion of gear shaping. Compared with hobbing, gear shaping is more suitable for being used for processing internal tooth, and the profile of tooth precision of gear shaping is higher than hobbing. In actual production, the internal teeth of the stator core 11 can be machined by a numerical control gear shaping machine.
Fig. 5 is a three-dimensional structural view of a rotor assembly of a planetary gear type brushless dc motor according to an embodiment of the present invention, and the rotor assembly 2 is a rotating part of the planetary gear type brushless dc motor.
The rotor assembly 2 is composed of a rotor core 21 and a planetary gear 22, and similar to the stator assembly structure described above, the rotor core 21 in the rotor assembly 2 shown in the drawings of the embodiment of the present invention is an integral part structure, and in specific implementation, the rotor assembly is formed by combining a plurality of silicon steel sheets with the same shape or different shapes according to the shape of the rotor core 21. Based on the existing technical conditions and production cost, the rotor core needs to be made in the form of silicon steel sheets, but under the support of specific occasions and specific materials, the rotor core can be made in the form of a single part shown in the attached drawings, and the specific implementation mode is determined in practical situations. In addition, the tile-shaped rare earth permanent magnet which is magnetized in the radial direction is further pasted on the outer surface of the rotor core 21, the rare earth permanent magnet can generate a permanent magnet magnetic field, and the permanent magnet magnetic field interacts with the magnetic field generated by the stator core 11 to enable the rotor assembly 2 to rotate.
Specifically, the rotor core 21 is divided into a first coaxial shaft segment 211, a rotor segment 212 and a second coaxial shaft segment 213, the first coaxial shaft segment 211 is matched with the motor base 5 based on a rolling bearing 23, and the second coaxial shaft segment 213 is matched with the output mechanism 3 based on a rolling bearing 24; the first shaft section 211 is matched with the motor base 5, and the second shaft section 213 is matched with the output mechanism 3, so that the rotor core 21 can rotate along a fixed shaft all the time in the rotating process.
Specifically, in the present embodiment, the sun gear in the planetary gear reducer is incorporated into the rotor core 21. Specifically, the outer periphery of the rotor section 212 of the rotor core 21 is processed into a third tooth profile meshed with the planetary gear 22, the third tooth profile refers to a tooth profile on the outer teeth of the rotor core, the third tooth profile is preferably an involute tooth profile, the rotation of the rotor core 21 is transmitted to the planetary gear 22 through the outer teeth of the rotor section 212 in a gear transmission mode, the planetary gear 22 is driven to rotate in the opposite rotation direction, and the rotation speed of the planetary gear 22 is determined by the transmission ratio between the gears, so that the first-stage speed reduction is achieved.
The number of the planetary gears 22 is 4, the periphery of the planetary gear is a second tooth profile, and the second tooth profile refers to a tooth profile on the outer teeth of the planetary gear; the axial length of the planetary gear 22 is less than or equal to the axial length of the rotor section 212 of the rotor core 21.
It should be noted that the third tooth profile of the rotor core rotor section, the second tooth profile of the planetary gear and the first tooth profile of the inner wall of the stator core of the embodiment of the invention are matched with each other, and the matching implementation principle is similar to that of the planetary gear reducer.
For convenience of machining, the external teeth of the rotor section 213 and the planetary gear 22 are machined by the above numerical control gear shaping machine. Specifically, the number of the planetary gears 22 is four, and the planetary gears are distributed on the periphery of the rotor core 21 along the circumference of the axis of the rotor core 21, the central axis of the planetary gear 22 is further provided with pin holes 221 matched with the output mechanism 3, the pin holes 221 are circular through holes, and the planetary gears can be machined and manufactured through a common lathe in production. Planetary gear 22 still meshes with the internal tooth of stator core 11 inner wall at the rotation in-process, and the internal tooth of stator core 11 meshes with planetary gear 22 and is the second grade speed reduction, output mechanism 3 transmits planetary gear 22 to the external world through the rotational speed after the two-stage speed reduction.
It should be noted that, in the embodiment of the present invention, a sun gear in a planetary gear reducer is combined with a rotor of a brushless dc motor, and compared with the existing reducer motor combination device, on one hand, if the existing reducer and the motor need to be coaxially connected, very high assembly precision is required, and compared with the assembly precision, the processing precision is easier to control in implementation; on the other hand, in long-term use, the speed reducer and the motor are separately arranged, so that looseness can be generated in use, the phenomenon of non-coaxial is easily generated, the problems of noise increase of equipment, reduction of transmission efficiency and the like are caused, and therefore the sun gear mechanism and the rotor of the planetary gear speed reducer are machined on the same shaft, the service life of the motor is prolonged, and the planetary gear speed reducer has good practicability.
Fig. 6 is a three-dimensional structural view of an output mechanism of the planetary gear type brushless dc motor in the embodiment of the present invention, and the output mechanism 3 is a portion of an output in the planetary gear type brushless dc motor. The output mechanism comprises an output connecting piece 31, a pin shaft 32 and an output shaft 33. Specifically, four pin shafts 32 are uniformly fixed on one side of the output connecting member 31 along the circumference of the axis, the four pin shafts 32 correspond to the four planetary gears 22 respectively and have the same size as the pin holes of the planetary gears 22, and the pin shafts 32 are always clamped in the planetary gears 22; specifically, the output shaft 32 is coaxially fixed on the other side of the output connecting piece 31 and extends out of the motor end cover 6, and the output shaft is fitted in the motor end cover 6 based on a rolling bearing 34; specifically, an annular bearing seat 311 is arranged in the middle of the output connecting member 31, and an outer ring of the rolling bearing 24 is fixed in the inner wall of the annular bearing seat 311; specifically, the one end that output shaft 33 stretches out motor end cover 6 is provided with keyway 331, is convenient for be connected output shaft and other subassemblies through the mode of key-type connection.
The motor housing 4 includes a motor base 5 and a motor end cover 6 connected to the motor base, fig. 7 is a three-dimensional structural view of the motor base in the embodiment of the present invention, and fig. 8 is a three-dimensional structural view of the motor end cover in the embodiment of the present invention.
As shown in fig. 7, the motor base 5 includes a wire box 51, a motor main housing 52 and a motor positioning seat 53, the wire box 51 is disposed on the motor main housing 52, and the motor positioning seat 53 is disposed below the motor main housing 52. Specifically, the line box 51 is provided with a line box lug 511, so that the line box can be conveniently opened and closed; specifically, the motor main housing 52 is provided with four housing mounting through holes 521 and four main housing heat dissipation bar holes 522, the four housing mounting through holes 521 are symmetrically distributed on one side of the motor main housing 52 close to the motor end cover 6, and the heat dissipation bar holes 522 are distributed on one side of the motor main housing 52 close to the rotor assembly 2 and dissipate heat of the rotor assembly 2; specifically, the rotor core 21 in the rotor assembly 2 is matched with the motor main housing 52 based on the rolling bearing 24; specifically, the motor positioning seat 53 is provided with a positioning through hole 531, so that the motor can be conveniently connected and fixed through a bolt, a screw, a pin, a rivet or other structures.
Specifically, the wire box 51 is provided therein with various electronic components required for the brushless dc motor, including an electronic commutator, an inverter, and a driver. The inverter is used for converting direct current provided by a power supply into alternating current to supply power to the motor; the inverter is a self-controlled inverter, and the output frequency thereof is controlled by a signal of a position sensor.
In particular, the main housing 52 of the motor is further provided with a plurality of position sensors, in the embodiment of the present invention, the position sensor is a magnetic sensing type hall element 523, the hall element 523 is a hall effect based magnetic sensing type sensor, and is used for detecting a magnetic field of a permanent magnet pole on the rotor core 21 and a change condition thereof, and detected information is transmitted to the electronic commutator.
It should be noted that the hall element 523 and the electronic commutator are respectively connected to a driver in the wire box 51, the driver is an indispensable part of the brushless dc motor, and the driver mainly has the following functions: receiving starting, stopping and braking signals of the motor, and controlling the starting, stopping and braking of the motor; receiving the signal of the hall element 523, and controlling the on-off of the power converter according to the signal of the hall element 523; and receiving the speed command and the speed feedback signal, controlling the power converter according to the speed command and the speed feedback signal, controlling and adjusting the rotating speed and the like.
As shown in fig. 8, the motor end cover 6 is provided with a motor end cover mounting through hole 61, a motor end cover heat dissipation bar hole 62 and an end cover bearing hole 63; specifically, the number of the motor end cover mounting through holes 61 is four and corresponds to the number of the shell mounting through holes 521, so that the motor end cover 6 can be conveniently connected and fixed on the motor base 5 through screws; specifically, the arrangement of the heat dissipation bar holes 62 on the motor end cover and the heat dissipation bar holes 522 on the motor base 5 enables the whole motor to be ventilated in a convection manner, so that heat dissipation is enhanced; specifically, the output shaft 33 on the output mechanism 3 passes through an end cover bearing hole 63 of the motor end cover 6 and is connected with the motor end cover 6 through the rolling bearing 34, and the end cover bearing hole 63 is a stepped hole and abuts against an outer ring of the rolling bearing 34, so that the rolling bearing 34 is prevented from axially moving when the motor operates.
In the planetary gear type brushless direct current motor provided by the embodiment of the invention, the motor base 5 and the motor end cover 6 are made of cast iron, and have the characteristics of high strength, good toughness and strong wear resistance.
The embodiment of the invention provides a planetary gear type brushless direct current motor, which comprises the following operation processes: after the motor is electrified, the inverter converts direct current provided by the power supply into alternating current, the driver receives a signal of a system to drive the motor to start, the electronic commutator and the driver distribute the power of a working power supply to each phase winding on the stator iron core 11 of the brushless direct current motor according to the rotor position information provided by the Hall element 523, and each phase winding correspondingly generates a rotating magnetic field which can enable the rotor assembly 2 to rotate to drive the rotor assembly 2 to rotate; during the rotation of the rotor assembly 2, the hall element 523 provides the position information of the rotor assembly 2 to the electronic commutator in real time, and the rotating magnetic field changes corresponding to the rotation of the rotor assembly 2, so that the rotor assembly 2 of the brushless dc motor rotates continuously. The high-speed rotation of the rotor assembly 2 is decelerated by the cooperation with the stator assembly 1, and the output mechanism 3 transmits the low speed of the rotor assembly 2 to the outside.
The embodiment of the invention provides a planetary gear type brushless direct current motor, which combines a sun gear in a planetary gear reducer with a rotor of the brushless direct current motor, avoids the motor from generating eccentricity to cause the motor to break down due to the problems of assembly, abrasion and the like, and has better reliability and better deceleration effect; the outer gear ring in the planetary gear reducer is connected and combined with the stator assembly of the brushless direct current motor, so that the use of parts is reduced, the volume of the motor is reduced, and the utilization rate of space is improved; the direct connection of the rotor assembly and the output mechanism reduces transmission loss and improves transmission efficiency; the arrangement of the motor shell protects the internal components of the motor, and the service life of the motor is prolonged. Therefore, the planetary gear type brushless direct current motor has the advantages of compact structure, small volume, high transmission efficiency and long service life.
In addition, the planetary gear type brushless dc motor provided in the embodiments of the present invention is described in detail above, and the principle and the embodiments of the present invention should be explained herein by using specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811437267.1A CN109378933B (en) | 2018-11-28 | 2018-11-28 | Planetary gear type brushless direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811437267.1A CN109378933B (en) | 2018-11-28 | 2018-11-28 | Planetary gear type brushless direct current motor |
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| Publication Number | Publication Date |
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| CN109378933A CN109378933A (en) | 2019-02-22 |
| CN109378933B true CN109378933B (en) | 2021-02-19 |
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| CN201811437267.1A Expired - Fee Related CN109378933B (en) | 2018-11-28 | 2018-11-28 | Planetary gear type brushless direct current motor |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19845914C2 (en) * | 1998-10-06 | 2000-08-24 | Bosch Gmbh Robert | Drive device |
| WO2007103266A2 (en) * | 2006-03-03 | 2007-09-13 | Borealis Technical Limited | Motor using magnetic normal force |
| US8568099B2 (en) * | 2010-12-17 | 2013-10-29 | Vestas Wind Systems A/S | Apparatus for harvesting energy from a gearbox to power an electrical device and related methods |
| DE102012210242A1 (en) * | 2012-06-18 | 2013-12-19 | Robert Bosch Gmbh | Electric motor with planetary gear |
| CN104702076A (en) * | 2015-02-04 | 2015-06-10 | 天津新日机电有限公司 | Brushless direct-current motor of electric bicycle |
| CN205901557U (en) * | 2016-08-12 | 2017-01-18 | 河南行星智能电子科技有限公司 | Novel brushless motor that built -in planetary reducer constructs |
| CN108400677B (en) * | 2018-03-25 | 2019-07-02 | 如皋久源传动机械有限公司 | Birotor input planet gear speed reducer |
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