CN116260279B - Energy-saving three-phase brushless DC motor - Google Patents

Energy-saving three-phase brushless DC motor Download PDF

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Publication number
CN116260279B
CN116260279B CN202310147323.2A CN202310147323A CN116260279B CN 116260279 B CN116260279 B CN 116260279B CN 202310147323 A CN202310147323 A CN 202310147323A CN 116260279 B CN116260279 B CN 116260279B
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CN
China
Prior art keywords
motor
slots
phase
main winding
stator
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CN202310147323.2A
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Chinese (zh)
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CN116260279A (en
Inventor
王焜生
杨禹
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Dongguan Maosheng Electronics Industrial Co ltd
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Dongguan Maosheng Electronics Industrial Co ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0092—Disposition of motor in, or adjacent to, traction wheel the motor axle being coaxial to the wheel axle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Abstract

An energy-saving three-phase brushless DC motor is composed of motor with empty slots and slots, and stator windings in slots and wound in two directions across each empty slot. When the motor is in operation, the pulse width modulation duty ratio can be adjusted by utilizing the three-phase windings of the stator coil, so that the passing current is changed, and the current direction flowing into the three-phase windings of the stator coil is switched by the controller, so that the magnetic field is changed, and the magnetic field is changed between the polarity of the stator and the polarity of the magnet of the rotor, so that the like poles repel and the opposite poles attract due to the magnetic field at the same time, and power is generated to control the rotation of the rotor; the original magnetic field is disconnected by a part (namely 1/13 is equal to the fact that the main magnetic poles of the 36 stators correspond to 12 rotor magnets) through the design of 3 empty slots, so that the rotating force is light, the rotor is rotated with good driving efficiency, the electricity saving function can be generated, and the effects of small current starting, effective energy saving and electricity saving are achieved.

Description

Energy-saving three-phase brushless DC motor
Technical Field
The invention relates to an energy-saving three-phase brushless direct current motor, in particular to a three-phase brushless direct current motor which cuts off a part of an original magnetic field by means of the design of 3 empty slots, reduces three-phase driving current to generate better driving capability to enable a rotor to rotate, particularly can generate an electricity-saving function and achieves the effects of small-current starting, effective energy saving and electricity saving.
Background
One common type of electric machine is a brushless dc motor, typically consisting of a stator and a rotor. The stator typically includes a coil having 3 sets of windings; the rotor typically contains permanent magnets. The rotor and the stator are mechanically arranged to allow the rotor to move freely relative to the stationary stator. Thus, electromagnetic interaction between the stator and the rotor moves the rotor in response to changes in polarity in the stator windings.
The winding mode of a general three-phase brushless DC motor is divided into a main magnetic pole winding and a slot winding, and the influences on current and magnetic fields are different. The current of the main pole winding will generate a larger phase difference, while the slot winding will have a smaller phase difference. The magnetic fields generated by the two may also be different. In addition, due to the fact that the zigzag silicon steel sheets exist in the slot windings, inductance can be reduced, the overall inductance is lower, and the inductance of the main magnetic pole windings is larger than that of the slot windings. Therefore, it is generally not suitable for the user to use.
Disclosure of Invention
The main objective of the present invention is to overcome the above-mentioned problems encountered in the prior art, and to provide a three-phase brushless dc motor, which can utilize a three-phase winding of a stator coil to adjust a duty ratio of Pulse-width modulation (PWM), so that a passing current is changed, and a controller switches a current direction flowing into the three-phase winding of the stator coil to generate a magnetic field, so that a magnetic field is changed between a polarity of the stator and a polarity of a magnet of the rotor, and a magnetic field is used to attract each other with like poles and opposite poles simultaneously, so as to generate power to control the rotation of the rotor, and then a part of an original magnetic field is disconnected (i.e. 1/13 is equal to 12 rotor magnets corresponding to 36 stator main poles in practice) by virtue of a design of 3 empty slots, so that a rotating force is lighter and has a better driving efficiency, thus a function of generating a small current start, and an effective energy-saving and electricity-saving effects are achieved.
In order to achieve the above purpose, the invention adopts the technical scheme that: an energy efficient three phase brushless dc motor comprising: the hub shell is a hollow shell formed by respectively screwing an upper hub cover and a lower hub cover on the left side and the right side of a hub, and a shaft sleeve is respectively arranged at the center of the upper hub cover and the lower hub cover in a penetrating way; the motor body is accommodated in the hub shell, and is a hollow shell formed by arranging a motor upper cover and a motor lower cover on the left side and the right side of a motor middle pipe respectively, wherein the motor upper cover is provided with a shaft sleeve in a penetrating way at the center, and a plurality of planetary shaft sleeves are further arranged around the shaft sleeve in a penetrating way; the motor is accommodated in the motor body and consists of a stator and a rotor, the stator is sleeved in the middle tube of the motor and is provided with a stator core, the stator core comprises a plurality of slots formed along the periphery of a central perforation and a plurality of main magnetic poles defined by two slots, three empty slots which do not act as an inlet line are arranged in the slots and are respectively arranged at positions with 120 degrees, each slot comprises a first initial region, a second initial region and a third initial region, the first initial region is provided with a first depth, the second initial region is provided with a second depth, the third initial region is provided with a third depth, the distance from the first initial region to the opening end of the slot is larger than the distance from the second initial region to the opening end of the slot, the distance from the third initial region to the opening end of each slot is smaller than the distance from the second initial region to the opening end of each slot, the rotor is rotatably arranged in the stator in a penetrating manner, each slot comprises a plurality of silicon steel sheets which form a coaxial magnetic core, the rotor is provided with a coaxial rotor core, the coaxial rotor core is arranged at the center and the center of the rotor core, the rotor core is provided with a coaxial magnetic core, and a coaxial rotor core is arranged at the center; a stator coil, which spans each empty slot and is wound in the slot in a bidirectional manner, and comprises a first phase main line winding, a second phase main line winding and a third phase main line winding, wherein one ends of the first phase main line winding, the second phase main line winding and the third phase main line winding are connected to a common point in parallel, the other ends of the first phase main line winding and the third phase main line winding are connected to a control point of a controller, the controller is used for switching three phase lines, the first phase main line winding spans two slots or spans two slots and one empty slot and is wound in the first starting area, the second phase main line winding spans two slots or spans two slots and one empty slot and is wound in the second starting area, the third phase main line winding spans two slots or spans two slots and one empty slot and is wound in the third starting area, the first phase main line winding, the second phase main line winding and the third phase main line winding are wound in a winding direction to an end point in a winding direction, and then are wound in a reverse winding direction in a winding direction, and the first phase main line winding, the second phase main line winding and the third phase main line winding are wound alternately on the stator main line winding and the reverse phase main winding are arranged on the stator winding; and a planetary gear set located between the hub upper cover and the motor upper cover and composed of an upper bracket, a toothed ring and a plurality of planetary teeth, wherein the upper bracket is provided with a shaft sleeve in a penetrating way, the inner ring of the toothed ring is provided with an inner gear ring, the outer ring is provided with a clutch tooth which can be sleeved in the hub upper cover, and each planetary tooth is rotatably arranged on the upper bracket facing the motor upper cover of the motor by virtue of a bearing and an axle center, surrounds the periphery of the motor tooth and is meshed with the motor tooth and the inner gear ring of the toothed ring respectively.
In the above embodiment of the present invention, the stator core is formed with 39 slots and 39 main poles in total around which the stator coil for three-phase current flow is wound.
In the above embodiment of the present invention, the inner circumference of the hub upper cover is further provided with a plurality of pawls disposed at positions of 120 degrees each to each other, which cooperate with the clutch teeth of the gear ring to achieve unidirectional transmission.
In the above embodiment of the present invention, an upper shaft portion is disposed on a side of the upper bracket facing the hub upper cover, and is inserted into the shaft sleeve of the hub upper cover and penetrates to the outside of the hub shell, a lower shaft portion is disposed on a side of the motor lower cover facing the hub lower cover, and is inserted into the shaft sleeve of the hub lower cover and penetrates to the outside of the hub shell, so that the left and right sides of the central rotating shaft are respectively inserted into the upper shaft portion and the lower shaft portion.
In the above embodiment of the present invention, a threaded portion is formed at each of the ends of the upper shaft portion and the lower shaft portion for connection to a power tool.
Drawings
Fig. 1 is an exploded schematic view of the energy-saving three-phase brushless dc motor of the present invention.
Fig. 2 is a schematic diagram of a combination of the energy-efficient three-phase brushless dc motor of the present invention.
Fig. 3 is a schematic sectional view of a stator of the energy-saving three-phase brushless dc motor of the present invention.
FIG. 4 is a single-phase winding schematic of a stator coil of the present invention; wherein: a-winding direction from left to right; b-right to left winding direction.
Fig. 5 is a schematic front view of a three-phase winding of a stator coil of the present invention.
Fig. 6 is a reverse schematic view of a three-phase winding of a stator coil of the present invention.
Fig. 7 is a schematic cross-sectional view of a motor of the energy-saving three-phase brushless dc motor of the present invention.
Fig. 8 is a schematic cross-sectional view of a planetary gear set of an energy efficient three-phase brushless dc motor of the present invention.
Reference numeral control:
energy-saving three-phase brushless DC motor 10
Hub shell 1
Hub 11
Hub upper cover 12
Shaft sleeve 121
Pawl 122
Hub lower cover 13
Shaft sleeve 131
Motor body 2
Motor middle tube 21
Motor upper cover 22
Shaft sleeve 221
Planetary sleeve 222
Motor lower cover 23
Motor 3
Stator 31
Stator core 311
Slot 312
First initiation region 3121
Second initiation region 3122
Third initiation region 3123
Empty slot 312a
Main pole 314
Open end 314
Rotor 32
Rotor core 321
Shaft hole 3211
Silicon steel sheet 321a
Center spindle 322
Motor teeth 323
Magnet 324
Stator coil 4
First phase main wire winding 41
Second phase main wire winding 42
Third phase main wire winding 43
Planetary gear set 5
Upper support 51
Shaft sleeve 511
Toothed ring 52
Inner gear ring 521
Clutch teeth 522
Planetary gear 53
Bearing 531
Axle center 532
Upper shaft portion 54
Screw portion 541
Lower shaft portion 55
Screw portion 551
And a controller 6.
Detailed Description
Referring to fig. 1 to 8, there are respectively an exploded schematic diagram of the energy-saving three-phase brushless dc motor of the present invention, a combined schematic diagram of the energy-saving three-phase brushless dc motor of the present invention, a stator cross-sectional schematic diagram of the energy-saving three-phase brushless dc motor of the present invention, a single-phase winding schematic diagram of the stator coil of the present invention, a three-phase winding front schematic diagram of the stator coil of the present invention, a three-phase winding back schematic diagram of the stator coil of the present invention, a motor cross-sectional schematic diagram of the energy-saving three-phase brushless dc motor of the present invention, and a planetary gear set cross-sectional schematic diagram of the energy-saving three-phase brushless dc motor of the present invention. As shown in the figure: the invention relates to an energy-saving three-phase brushless direct current motor which comprises a hub shell 1, a motor body 2, a motor 3, a stator coil 4 and a planetary gear set 5.
The hub shell 1 is a hollow shell formed by respectively screwing a hub upper cover 12 and a hub lower cover 13 on the left side and the right side of a hub 11. The hub upper cover 12 and the hub lower cover 13 are respectively provided with a shaft sleeve 121 and 131 at the center.
The motor body 2 is accommodated in the hub shell 1, and is a hollow shell formed by respectively assembling a motor upper cover 22 and a motor lower cover 23 on the left side and the right side of a motor middle tube 21. The motor upper cover 22 is provided with a shaft sleeve 221 penetrating through the center, and a plurality of planetary shaft sleeves 222 penetrating around the shaft sleeve 221.
The motor 3 is accommodated in the motor body 2, and is composed of a stator 31 and a rotor 32. The stator 31 is sleeved in the middle tube 21 of the motor, and has a stator core 311, the stator core 311 includes a plurality of slots 312 formed along the periphery of the central through hole, and a plurality of main poles 313 defined by two slots 312, three non-wire-entering slots 312a are disposed in the slots 312, the three slots 312a are disposed at positions at 120 degrees each, each slot 312 includes a first start region 3121, a second start region 3122, and a third start region 3123. The first start region 3121 has a first depth, the second start region 3122 has a second depth, the third start region 3123 has a third depth, the distance from each of the first start regions 3121 to the open end 314 of each of the slots 312 is greater than the distance from each of the second start regions 3122 to the open end 314 of each of the slots 312, and the distance from each of the third start regions 3123 to the open end 314 of each of the slots 312 is less than the distance from each of the second start regions 3122 to the open end 314 of each of the slots 312. The rotor 32 is rotatably inserted into the stator 31, and has a rotor core 321 formed by stacking and combining a plurality of silicon steel plates 321a, wherein each silicon steel plate 321a is provided with a shaft hole 3211 at the center thereof, a central rotating shaft 322 is provided and is integrally connected with the rotor core 321, the tail end of the central rotating shaft 322 is coaxially and synchronously provided with a motor tooth 323, and a plurality of radially magnetized magnets 324 are arranged on the peripheral spacer ring of the rotor core 321.
The stator coil 4 is bidirectionally wound in each slot 312 across each empty slot 312 a. The stator coil 4 includes a first phase main winding 41, a second phase main winding 42 and a third phase main winding 43, wherein one ends of the first phase main winding 41, the second phase main winding 42 and the third phase main winding 4 are connected in parallel to a common point, and the other ends are connected to a control point of a controller 6, and the controller 6 performs three-phase switching. The first phase main winding 41 is wound in the first start region 3121 across the two slots 312 or across the two slots 312 and the empty slot 312a, the second phase main winding 42 is wound in the second start region 3122 across the two slots 312 or across the two slots 312 and the empty slot 312a, and the third phase main winding 43 is wound in the third start region 3123 across the two slots 312 or across the two slots 312 and the empty slot 312 a. The first phase main winding 41, the second phase main winding 42 and the third phase main winding 43 are continuously wound in a reverse winding direction by turning back after being wound to the end point in a forward winding direction, and the stator coils 4 of the first phase main winding 41, the second phase main winding 42 and the third phase main winding 43 are alternately arranged on the front and the back of the stator core 311.
The planetary gear set 5 is located between the hub upper cover 12 and the motor upper cover 22, and is composed of an upper carrier 51, a ring gear 52 and a plurality of planetary teeth 53. The upper bracket 51 is provided with a shaft sleeve 511, the inner ring of the toothed ring 52 is provided with an inner gear ring 521, the outer ring of the toothed ring 52 is provided with a clutch gear 522 which can be sleeved in the upper hub cover 12, and each planetary gear 53 is rotatably arranged on the upper bracket 51 facing the upper motor cover 22 of the motor 3 by a bearing 531 and an axle center 532, surrounds the motor gear 323 and is meshed with the motor gear 323 and the inner gear ring 521 of the toothed ring 52 respectively. Thus, a totally new energy-saving three-phase brushless DC motor 100 is constructed by the above disclosed structure.
In a preferred embodiment of the present invention, the stator core 311 is formed with 39 slots and 39 main poles in total around which the stator coil 4 for three-phase current flow is wound, as shown in fig. 3.
In a preferred embodiment of the present invention, the inner circumference of the hub cap 12 is further provided with a plurality of pawls 122 disposed at 120-degree angles to each other, which cooperate with the clutch teeth 522 of the associated ring gear 52 for unidirectional transmission, as shown in fig. 8.
In a preferred embodiment of the present invention, an upper shaft 54 is disposed on a side of the upper bracket 51 facing the hub upper cover 12, and penetrates into the shaft sleeve 121 of the hub upper cover 12 and extends out of the hub shell 1, a lower shaft 55 is disposed on a side of the lower motor cover 23 facing the lower hub cover 13, and penetrates into the shaft sleeve 131 of the lower hub cover 13 and extends out of the hub shell 1, such that left and right sides of the central rotating shaft 322 penetrate into the upper shaft 54 and the lower shaft 55, respectively.
In a preferred embodiment of the present invention, the ends of the upper shaft 54 and the lower shaft 55 are formed with a threaded portion 541, 551, respectively, as shown in fig. 2, for use with a power tool (not shown).
When assembled, the present invention provides stator winding improvement, the overall structure comprises a rotor 32 and a stator 31 to form a motor 3, the rotor 32 is provided with 12 radially magnetized magnets 324 at intervals on the periphery, so that the poles of the magnets 324 close to the main pole 313 of the stator 31 are connected. As shown in fig. 7, when the sections of the magnets 324 are seen, half of the same magnet 324 is S-pole and half is N-pole, 12 magnets 324 form S, N, S, N … poles, the same outer ring is arranged at S, N, S, N … poles at intervals, and the controller switches the current direction flowing to the stator coil 4, so that the poles of the stator 31 become an active pole.
Then, the motor middle tube 21 is sleeved outside the motor 3, and the left side and the right side of the motor middle tube 21 are respectively combined with the motor upper cover 22 and the motor lower cover 23 to form the motor body 2. And after the motor upper cover 22 and the hub upper cover 12 are provided with a plurality of planetary gears 53, a toothed ring 52 with an inner ring and an outer ring provided with an inner gear ring 521 and a clutch gear 525 and an upper bracket 51, the hub upper cover 12 and the hub lower cover 13 are assembled to complete the whole assembly, thus forming the energy-saving three-phase brushless direct current motor 100.
In the winding method of the stator coil 4, the stator 31 is formed with 39 slots 312 and 39 main poles 313 in total of the three-phase winding stator coil 4, and 3 slots J among the 39 slots 312 are empty slots 312a without wire entry, and are arranged at positions each forming an angle of 120 degrees. Compared with the traditional technology that all slots are wound, the traditional technology can form a closed magnetic field to generate negative attraction of the magnetic field, and when the power is electrified to rotate, larger current is needed to be paid for driving, so that the power saving effect is poor. The energy-saving three-phase brushless direct current motor 100 provided by the invention has the advantages that 3 slots serving as the empty slots 312a can break the closed magnetic field, so that the negative suction force is reduced; as shown in fig. 4, for clarity of the drawing, in fig. 4a, a single-phase winding (e.g., the first phase main winding 41) is taken as an example, the first phase main winding 41 is wound from left to right, the first slot 312 penetrates through the space between two slots 312 and then penetrates through the third slot 312, if the third slot is a hollow slot 312a, the fourth slot 312 penetrates through the fourth slot 312 and is wound at the first starting region 3121, the winding is wound from left to right to the end point and then turned back, the winding is continuously wound from right to left in the winding direction as shown in fig. 4b, and the first phase main winding 41 is alternately arranged on the front and the back of the stator core 311, and the front and the back of the three-phase main windings 41 to 43 are all wound as shown in fig. 5 and 6.
When the invention is operated, the Pulse-width modulation (PWM) duty ratio is adjusted by utilizing the three-phase windings of the stator coil 4, the impedance and inductance are reduced, copper loss can be effectively reduced, the passing current is changed, the current direction flowing into the three-phase windings of the stator coil 4 is switched by the controller 6, the magnetic field is changed, the polarity of the stator 31 and the polarity of the magnet 324 of the rotor 32 are changed, and the magnetic field simultaneously generates the action of the like poles and the opposite poles to attract each other, so that power is generated to control the rotor to rotate.
In summary, the energy-saving three-phase brushless dc motor of the present invention can effectively improve various disadvantages of the prior art, utilize the three-phase winding of the stator coil to reduce impedance and inductance, effectively reduce copper loss, and switch the current direction flowing into the three-phase winding of the stator coil by the controller to generate magnetic field variation, so that the magnetic field between the polarity of the stator and the polarity of the magnet of the rotor generates power to control the rotation of the rotor due to the attraction of like poles and opposite poles simultaneously occurring in the magnetic field, and then disconnect a part of the original magnetic field by the design of 3 empty slots, so that the rotating force is lighter and has better driving efficiency to rotate the rotor, thus generating the function of saving electricity, achieving the effect of small current start, and further enabling the generation of the invention to be more advanced, more practical and more in line with the requirements of users, and conforming to the requirements of the patent application according to law.
However, the above description is only of the preferred embodiments of the present invention, and the scope of the present invention should not be limited thereto. Therefore, all such simple and equivalent changes and modifications as made by the claims and the disclosure of the present invention shall fall within the scope of the present invention.

Claims (5)

1. An energy-saving three-phase brushless dc motor, comprising:
the hub shell is a hollow shell formed by respectively screwing an upper hub cover and a lower hub cover on the left side and the right side of a hub, and a shaft sleeve is respectively penetrated at the center of the upper hub cover and the lower hub cover;
the motor body is accommodated in the hub shell, and is a hollow shell formed by respectively assembling a motor upper cover and a motor lower cover on the left side and the right side of a motor middle pipe, wherein the motor upper cover is provided with a shaft sleeve in a penetrating way at the center, and a plurality of planetary shaft sleeves are further arranged around the shaft sleeve in a penetrating way;
the motor is accommodated in the motor body and consists of a stator and a rotor, the stator is sleeved in the middle tube of the motor and is provided with a stator core, the stator core comprises a plurality of slots formed along the periphery of a central perforation and a plurality of main magnetic poles defined by two slots, three empty slots which do not serve as an inlet line are arranged in the slots, the three empty slots are arranged at positions which are 120 degrees respectively, each slot comprises a first initial region, a second initial region and a third initial region, the first initial region is provided with a first depth, the second initial region is provided with a second depth, the third initial region is provided with a third depth, the distance from the first initial region to the opening end of the slot is larger than the distance from the second initial region to the opening end of the slot, the distance from the third initial region to the opening end of the slot is smaller than the distance from the second initial region to the opening end of the slot, the rotor is rotatably arranged in the stator in a penetrating manner, each slot comprises a silicon steel sheet, the rotor is provided with a coaxial rotor core, a rotor core is coaxially arranged at the center, a rotating shaft is provided with a coaxial rotor core, a rotor core is coaxially arranged at the center, and a rotating shaft is provided with a rotor core, and a rotor core is coaxially arranged at the center;
a stator coil, which spans each empty slot and is wound in the slot in a bidirectional manner, and comprises a first phase main winding, a second phase main winding and a third phase main winding, wherein one ends of the first phase main winding, the second phase main winding and the third phase main winding are connected to a common point in parallel, the other ends of the first phase main winding and the second phase main winding are connected to a control point of a controller, the controller is used for switching three phase lines, the first phase main winding spans two slots or spans two slots and one empty slot and is wound in a first starting area, the second phase main winding spans two slots or spans two slots and one empty slot and is wound in a second starting area, the third phase main winding spans two slots or spans two slots and one empty slot and is wound in a third starting area, the first phase main winding, the second phase main winding and the third phase main winding are wound to an end point in a winding direction, and then are turned back and continuously wound in a winding direction in a reverse winding direction, and the first phase main winding, the first phase main winding and the second phase main winding and the third phase main winding are alternately arranged on the stator main winding and the stator winding; and
the planetary gear set is positioned between the hub upper cover and the motor upper cover, and consists of an upper bracket, a toothed ring and a plurality of planetary teeth, wherein the upper bracket is provided with a shaft sleeve in a penetrating way, the inner ring of the toothed ring is provided with an inner gear ring, the outer ring is provided with a clutch tooth which can be sleeved in the hub upper cover, and each planetary tooth is rotatably arranged on the upper bracket facing the motor upper cover of the motor through a bearing and an axle center, surrounds the motor tooth and is meshed with the motor tooth and the inner gear ring of the toothed ring respectively.
2. An energy-saving three-phase brushless dc motor according to claim 1, wherein the stator core is formed with 39 slots and 39 main poles in total around which the stator coil for three-phase current flow is wound.
3. The energy-saving three-phase brushless direct current motor according to claim 1, wherein the inner circumference of the upper cover of the hub is further provided with a plurality of pawls which are arranged at positions forming an angle of 120 degrees with each other and are matched with clutch teeth of the gear ring which are assembled to achieve unidirectional transmission.
4. The energy-saving three-phase brushless direct current motor according to claim 1, wherein an upper shaft portion is arranged on one side of the upper bracket facing the upper hub cover, penetrates into the shaft sleeve of the upper hub cover and penetrates to the outside of the hub shell, a lower shaft portion is arranged on one side of the lower motor cover facing the lower hub cover, penetrates into the shaft sleeve of the lower hub cover and penetrates to the outside of the hub shell, and the left side and the right side of the central rotating shaft penetrate into the upper shaft portion and the lower shaft portion respectively.
5. The energy-saving three-phase brushless dc motor of claim 4, wherein the upper shaft portion and the lower shaft portion are each formed with a screw portion at an end thereof for connection with a power tool.
CN202310147323.2A 2023-02-22 2023-02-22 Energy-saving three-phase brushless DC motor Active CN116260279B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001286114A (en) * 2000-01-25 2001-10-12 Toshiba Corp Motor and elevator unit
CN1756040A (en) * 2004-09-30 2006-04-05 株式会社日立制作所 Rotating electrical machine and machine winding
CN202364085U (en) * 2011-10-12 2012-08-01 泰豪科技股份有限公司 Synchronous generator sine duplex lap winding
CN205064786U (en) * 2015-10-30 2016-03-02 东莞市懋胜电子实业有限公司 Three -layer planetary gear case
WO2021161406A1 (en) * 2020-02-12 2021-08-19 三菱電機株式会社 Stator, electric motor, compressor, air conditioner, and method for manufacturing stator
WO2021161409A1 (en) * 2020-02-12 2021-08-19 三菱電機株式会社 Stator, motor, compressor, air conditioner, and method for manufacturing stator
CN216564877U (en) * 2021-12-28 2022-05-17 常州吉科传动设备有限公司 High-torque low-rotation-speed self-braking brushless hub motor structure

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001286114A (en) * 2000-01-25 2001-10-12 Toshiba Corp Motor and elevator unit
CN1756040A (en) * 2004-09-30 2006-04-05 株式会社日立制作所 Rotating electrical machine and machine winding
CN202364085U (en) * 2011-10-12 2012-08-01 泰豪科技股份有限公司 Synchronous generator sine duplex lap winding
CN205064786U (en) * 2015-10-30 2016-03-02 东莞市懋胜电子实业有限公司 Three -layer planetary gear case
WO2021161406A1 (en) * 2020-02-12 2021-08-19 三菱電機株式会社 Stator, electric motor, compressor, air conditioner, and method for manufacturing stator
WO2021161409A1 (en) * 2020-02-12 2021-08-19 三菱電機株式会社 Stator, motor, compressor, air conditioner, and method for manufacturing stator
CN216564877U (en) * 2021-12-28 2022-05-17 常州吉科传动设备有限公司 High-torque low-rotation-speed self-braking brushless hub motor structure

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