CN114374286A - Brushless DC motor rotor and stator structure - Google Patents

Brushless DC motor rotor and stator structure Download PDF

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Publication number
CN114374286A
CN114374286A CN202210033986.7A CN202210033986A CN114374286A CN 114374286 A CN114374286 A CN 114374286A CN 202210033986 A CN202210033986 A CN 202210033986A CN 114374286 A CN114374286 A CN 114374286A
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China
Prior art keywords
rotor
pole
stator
pole shoe
brushless
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Withdrawn
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CN202210033986.7A
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Chinese (zh)
Inventor
许少青
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Pan Zhaokeng
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Individual
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Priority to CN202210033986.7A priority Critical patent/CN114374286A/en
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    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • 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
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • 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
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • 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

A rotor and stator structure of a brushless direct current motor is characterized in that gaps between rotor magnetic poles and stator iron core pole shoes are equal, every two adjacent stator iron core pole shoes are in a group, a part of sector pole shoes with the same size and shape are cut off from the outer side end of one stator iron core pole shoe on the same side of each group of stator iron core pole shoes, each group of two stator iron cores are respectively provided with a positive winding and a reverse winding which are connected in series in the same arrangement mode, serial groups of the positive winding and the reverse winding of each group of stator iron cores are sequentially connected in series to obtain a head outgoing line and a tail outgoing line which are connected with the output end of a winding driving circuit, a rotor magnetic pole polarity detector is arranged on the outer side of a magnetic pole near any N, S pole interface of a rotor, and the magnetic pole polarity is the same as the magnetic pole polarity corresponding to the pole shoe with a part of the sector pole shoes cut off. The rotor and stator structure of the brushless DC motor can prevent the brushless DC motor from generating a locked rotor phenomenon, leads to very small motor vibration and noise, and has large rotor torque, simple structure and low production cost.

Description

Brushless DC motor rotor and stator structure
Technical Field
The invention relates to the technical field of brushless direct current motors, in particular to a rotor and stator structure of a brushless direct current motor.
Background
The brushless direct current motor consists of a motor main body and a driver, has the advantages of high reliability, no reversing spark, low mechanical noise and the like, is widely applied to various electronic equipment, household appliances and particularly electric fans, has the defect of locked rotor, and can not work if the locked rotor is light and burn down the motor if the locked rotor is heavy.
At present, most of brushless direct current motors have permanent magnet structures, a three-phase Y-shaped driving mode is adopted, and the rotors are driven by a stator rotating magnetic field to rotate, so that the phenomenon of rotation blockage cannot occur. However, in the operation process of the brushless dc motor with such a structure, even if the stator has a multi-pole structure, only the magnetic field forces generated by the three poles simultaneously act on the rotor to obtain the torque, so that the torque obtained by the rotor is not the maximum value, and the driving method has a complex structure and is high in cost.
The brushless DC motor with single-phase or two-phase structure has simple structure and low cost, and the magnetic field force is generated between the stator pole shoes and the rotor poles simultaneously, the torque is large, the number of poles of the rotor and the stator is equal, but the brushless DC motor has the defect that dead points occur during starting to cause locked rotation.
In order to overcome the phenomenon of locked rotor, the adoption of non-uniform working gap between rotor and stator is a simple and effective method for eliminating dead point of single-phase and two-phase brushless DC motor, and its concrete method is that between the maximum magnetic conductive axis between stator gap and rotor gap and straight axis of main magnetic pole of rotor an electric angle is deviated, i.e. the gap between outer arc edge of every pole shoe of stator and arc edge of magnetic pole of rotor is formed from one side end portion of pole shoe as minimum gap, and gradually transits to another side end portion of said pole shoe as maximum gap, in order to obtain good effect, the maximum gap is generally selected to be more than 2 times of minimum gap, and the minimum gap also can not be too small, and because the electromagnetic force and gap size between magnetic poles are in inverse proportion, if the maximum gap is twice of minimum gap, the rotating electromagnetic force for motor can be reduced by 25%. In addition, in the process of rotor rotation, because the gap variation amount is more than one time in the process of meeting the stator pole shoe and the rotor magnetic pole, the electromagnetic force of the rotor also correspondingly generates large variation, and the continuous variation of the torque in the process of rotor rotation inevitably generates large vibration and noise.
Chinese patent application publication No. 1079447517a, entitled stator assembly and single-phase brushless dc motor, discloses a rotor and stator structure of a brushless dc motor, in which it is described that "the length of the stator pole shoe is greater than that of the second stage shoe, a gap is formed between the end of the first pole shoe and the end of the second pole shoe, the gap deviates from the midpoint of the winding slot in the length direction", see paragraph 0030 in the specification, even if the rotor of the structure can rotate, because the stator is in an irregular shape relative to the rotor, i.e. the gap of the rotor relative to the stator is constantly changed, the magnitude of the gap between the rotor and the stator constantly changes after the rotor rotates, the magnitude of the motor torque constantly changes, the rotation speed of the rotor constantly changes, and thus the motor also generates larger vibration and noise as the above-mentioned method using uneven working gap, as the gap between the rotor and stator varies more and more, the resulting vibration and noise also increases, and as the average gap becomes larger, the torque is much smaller than with the non-uniform working gap configuration described above. And this structure is difficult to be used in a multi-pole brushless dc motor.
The two-phase brushless direct current motor is adopted, and the vibration and the noise of the motor cannot be reduced except the complex coil structure.
The Chinese patent application with the application publication number of CN111756138A and the invention name of "brushless direct current motor" discloses a brushless direct current motor with a complex structure designed on a rotor punching sheet and a stator punching sheet, wherein the rotor punching sheet is designed into an irregular circle, and the design of an uneven motor air gap is designed by following the design idea of a magnetic circuit sine wave … …, so that the vibration of the rotor is smaller, and the noise is correspondingly lower. "refer to paragraph [0006] of the specification, the purpose of which is not to solve the problem of stalling of the brushless dc motor when the number of single-phase rotor poles is the same as the number of stator pole shoes.
Disclosure of Invention
The invention aims to provide a rotor and stator structure of a brushless direct current motor, which can prevent the brushless direct current motor from generating a locked rotor phenomenon, and has the advantages of large torque of a rotor, simple structure, low production cost and less material consumption.
The technical solution proposed by the present invention is as follows:
a brushless direct current motor rotor and stator structure comprises a rotor formed by permanent magnet poles of N, S poles which are alternately arranged and in a sector shape, wherein the lengths of inner side circular arcs or outer side circular arcs of the poles of the rotor are equal, a stator core concentric with the rotor is provided with pole shoes which are the same as the number of the rotor poles and are opposite one by one, the pole shoes are in a sector shape, the lengths of the outer side circular arcs of the pole shoes are equal, gaps between the rotor poles and the pole shoes of the stator core are equal gaps, the number of the pole shoes of the stator core is 2 x (a positive integer of 2-12), every two adjacent pole shoes of the stator core are in one group, and a part of sector pole shoes with the same size and shape is cut off from the end part of the outer side pole shoe of the stator core at the same side of one pole shoe of each group of the pole shoes of the stator core; each group of two stator cores are respectively provided with a forward winding and a reverse winding which are connected in series in the same arrangement mode, and the series groups of the forward winding and the reverse winding of each group of stator cores are sequentially connected in series to obtain a head outgoing line and a tail outgoing line which are connected with the output end of the winding driving circuit; and a rotor magnetic pole polarity detector is arranged outside the magnetic pole near any N, S pole interface of the rotor, and the polarity of the rotor magnetic pole is the same as that of the rotor magnetic pole corresponding to the pole shoe of the sector which is cut off partially.
The length of the outer side arc of the cut part of the fan-shaped pole shoe is 0.05-0.12 time of the length of the outer side arc of the original pole shoe. The rotor is arranged in the center of a pole shoe of the stator core to form an inner rotor structure. The rotor is arranged on the periphery of a pole shoe of the stator core to form an outer rotor structure. And the gap between the rotor magnetic pole and the stator core pole shoe is in the range of 0.2-0.8 mm. The winding driving circuit supplies a forward or reverse current to the winding in accordance with the detection of the different N or S polarity of the rotor magnetic pole by the rotor magnetic pole polarity detector.
Compared with the prior art, the invention has the following remarkable effects:
in the structure of the rotor and the stator of the brushless direct current motor, the rotor is composed of permanent magnet fan-shaped magnetic poles which are same in size, same in arc length on the same side and arranged alternately with N, S poles, the stator is provided with fan-shaped pole shoes which are same in number with the rotor magnetic poles, mutually correspond to one another and are equidistant, every two adjacent pole shoes are in one group, and the outer end of one pole shoe on the same side of each group of pole shoes is cut off to form a first fan-shaped pole shoe which is same in size and shape. Thus, when the N, S pole interface of the rotor is located on the central line of the space between the two corresponding pole shoes (in a static state) before the first segment pole shoe is not cut off, the rotor is easy to generate a locked rotor phenomenon when the stator winding is electrified to work. When the first segment pole shoe is cut off, the spacing between the pole shoe and the other adjacent group of pole shoes is increased, the corresponding pole shoe N, S pole interface is deviated to one side of the pole shoe from which the first segment pole shoe is cut off (at the rest state) due to the weakening of the magnetic field intensity, when the stator winding is electrified and works, the corresponding pole shoe and the rotor magnetic pole have the same polarity, and the minimum distance between the end part of the pole shoe adjacent to the other side end part of the pole shoe of the cut-off part pole shoe and the rotor magnetic pole corresponding to the pole shoe of the cut-off part pole shoe is shortened due to the change of the gap between the pole shoes, so that a larger suction force is generated between the two, and the rotor is driven to rotate from the end of the pole shoe which is not cut to the other end of the pole shoe which is cut off. The polarity of the pole shoe is the same as that of the corresponding rotor magnetic pole through the rotor magnetic pole polarity detector and the winding driving circuit, the rotor is driven to continuously rotate in the same direction, the ordered change of the polarity of the pole shoe is continuously repeated, and the rotor can continuously rotate, so that the phenomenon of locked rotor can not occur under any condition.
(2) When the stator works, all the windings of the stator core are supplied with power at the same time, and the gaps between the rotor and the stator are equal and small, so that the torque is large, and the vibration and the noise which are possibly generated are small. Meanwhile, the connecting circuit of each winding is simple, the consumed material is less, the volume is small, and the production cost is low. The brushless direct current motor is suitable for single-phase and unidirectional rotation equipment, such as an electric fan, an air freshener and the like.
Drawings
Fig. 1 is a structural schematic diagram of a rotor and stator structure of a brushless dc motor according to the present invention, the structure is an outer rotor structure, and the number of pole shoes of a stator core is 6.
Fig. 2 is a schematic diagram of a rotor and stator structure of a brushless dc motor according to an embodiment of the present invention, the brushless dc motor has an outer rotor structure, and the number of pole shoes of a stator core is 8.
Fig. 3 is a schematic diagram of a rotor and stator structure of a brushless dc motor according to another embodiment of the present invention, the brushless dc motor has an inner rotor structure, and the number of pole shoes of a stator core is 4.
The reference numbers in the figures illustrate: 1. a rotor; 1-1. magnetic pole; 1-2. rotor pole N, S pole interface; 2. a stator; 2-1, a stator core; 2-2, pole shoe; 2-2-1. a first sector pole shoe; 3-1, a forward winding; 3-2, reverse winding; 4. a rotor magnetic pole polarity detector; 11. a second rotor; 11-1. a second rotor magnetic pole; 11-2. second rotor pole N, S pole interface; 12. a third rotor; 12-1. a third rotor pole; 12-2. third rotor pole N, S pole interface; 21. a second stator; 21-1. a second stator core; 21-2. a second pole piece; 21-2-1. a third fan-shaped pole shoe; a fourth stator; 22-1. a fourth stator core; 22-2. a fourth pole shoe; 22-2-1 fifth sector pole piece; 31-1. a first forward winding; 31-2. a first reverse winding; 32-1. a second forward winding; 32-2. second reverse winding.
Detailed Description
The invention is illustrated in further detail by the following examples.
Example 1:
referring to fig. 1, a brushless direct current motor rotor and stator structure comprises a rotor 1 composed of N, S poles of permanent magnet magnetic poles 1-1 arranged alternately in a row and in a sector shape, wherein the lengths of inner circular arcs or outer circular arcs of the magnetic poles 1-1 of the rotor are equal, stator 2 iron cores concentric with the rotor 1 are provided with pole shoes 2-2 which are the same as the magnetic poles of the rotor and are opposite to each other one by one, the pole shoes 2-2 are in a sector shape, the lengths of outer circular arcs of the pole shoes 2-2 are equal, gaps between the magnetic poles 1-1 of the rotor and the pole shoes 2-2 of the stator iron cores are equal, the number of the pole shoes 2-2 of the stator iron cores is 2 x (a positive integer of 2-12), every two adjacent stator iron core pole shoes 2-2 are in one group, and the outer side end of one of the stator iron core pole shoes 2-2 on the same side is cut off in size, The first sector pole shoes 2-2-1 with the same shape; each group of two stator cores 2-1 is respectively provided with a forward winding 3-1 and a reverse winding 3-2 which are connected in series in the same arrangement mode, and the series groups of the forward winding and the reverse winding of each group of stator cores 2-1 are sequentially connected in series to obtain a head outgoing line A, B and a tail outgoing line A, B which are connected with the output end of the winding driving circuit; a rotor magnetic pole polarity detector 4 is arranged outside the magnetic pole 1-1 near any N, S pole interface 1-2 of the rotor 1, and the polarity of the rotor magnetic pole 1-1 is the same as that of the rotor magnetic pole 1-1 corresponding to the pole shoe 2-2 of the first segment pole shoe 2-2-1 which is cut off.
The length of the outer side arc of the cut part of the fan-shaped pole shoe 2-2-1 is 0.05-0.12 time of the length of the outer side arc of the original pole shoe 2-2. The rotor is arranged in the center of a stator core pole shoe 2-2 to form an inner rotor structure. The rotor is arranged on the periphery of the stator core pole shoe 2-2 to form an outer rotor structure. The gap between the rotor magnetic pole 1-1 and the stator core pole shoe 2-2 ranges from 0.2 mm to 0.8 mm. The winding drive circuit supplies a forward or reverse current to the winding in accordance with the detection of the different N or S polarity of the rotor poles 1-1 by the rotor pole polarity detector 4.
Example 2:
referring to fig. 2, the present embodiment is an outer rotor type single phase brushless dc motor, the diameter of the second pole piece 21-2 of the second stator 21 is phi 67 mm; the number of the stator poles of the second stator 21 is 8, the second stator 21 is provided with 8 second pole shoes 21-2, the lengths of outer arcs of the second pole shoes 21-2 are the same, every two adjacent second pole shoes 21-2 are in one group, and the outer side end of the second pole shoe 21-2 on the same side of one of the two second pole shoes 21-2 in each group is cut off with a third fan-shaped pole shoe 21-2-1 with the same size and shape; in this embodiment, the length of the outer arc of the third fan-shaped pole piece 21-2-1 is 0.07 times the length of the outer arc of the original second pole piece 21-2. Each group of two second stator cores 21-1 are respectively provided with a first forward winding 31-1 and a first reverse winding 31-2 which have the same number of turns and are connected in series in the same arrangement mode, the number of turns of each group of windings is 500, and four series groups of the first forward winding 31-1 and the first reverse winding 31-2 of each group of the second stator cores 21-1 are sequentially connected in series to obtain a head lead wire and a tail lead wire C and D which are connected with the output end of the winding driving circuit.
The second rotor 11 is composed of N, S poles arranged alternately and second rotor magnetic poles 11-1 of permanent magnets of a sector, the lengths of inner side circular arcs of the second rotor magnetic poles 11-1 are equal, in the embodiment, the number of the second rotor magnetic poles 11-1 is 8, and the gap between the second rotor magnetic poles 11-1 and the second pole shoe 21-2 is equal, and in the embodiment, the selected gap is 0.5 mm.
In a static state, if a part of the sector-shaped pole shoe is not cut off from one side of the alternate pole shoes, the pole interface N, S of each pole of the second rotor is located at the center of the gap between the two corresponding adjacent second pole shoes, in this embodiment, when the third sector-shaped pole shoe 21-2-1 is cut off from the outer side end of the second pole shoe 21-2 on the same side of one of the second pole shoes 21-2, the gap between the two adjacent second pole shoes 21-2 increases the arc length of the third sector-shaped pole shoe 21-2-1, and the pole interface 11-2 of the corresponding second rotor pole N, S is deflected a little toward the second pole shoe 21-2 from which the third sector-shaped pole shoe 21-2-1 is cut off along with the second rotor 11, because the magnetic induction intensity at the position is reduced.
In operation, according to the result of detecting the polarity of the rotor magnetic pole polarity detector 4 arranged at the outer side of the second rotor magnetic pole 11-1 near the N, S pole interface 11-2 of the second rotor 11, the winding driving circuit supplies power to the two outgoing lines C, D of the series winding and makes the polarity of each second pole shoe 21-2 the same as that of the corresponding second rotor magnetic pole 11-1, so that a repulsive force is generated between the corresponding second pole shoe 21-2 and the second rotor magnetic pole 11-1, but the end part cut off the third fan-shaped pole shoe 21-2-1 is deflected to the end part due to the pole interface 11-2 of the corresponding second rotor magnetic pole N, S, so that the minimum distance between the end part and the second rotor magnetic pole 11-1 corresponding to the second pole shoe 21-2 adjacent to the end part is reduced, and therefore, a larger attraction force is generated between the two, the magnetic pole interface towards the other end deviates towards the corresponding magnetic pole, the end part of the pole shoe corresponding to the magnet generates the attraction force, so that an attraction force which enables the second rotor 11 to rotate from one end of the adjacent second pole shoe to one end of the cut-off part of the pole shoe is generated, further, the second rotor 11 is driven to rotate, after the second rotor 11 rotates, each second rotor magnetic pole 11-1 is pushed by the attraction force generated by the corresponding second pole shoe 21-2 and the self thrust force to continue to rotate, when the second rotor 11 rotates to the next second rotor magnetic pole 11-2 according to the next second rotor magnetic pole N, S pole interface 11-2 detected by the rotor magnetic pole polarity detector 4 and enters another second rotor magnetic pole 11-1 with different polarity, the current supplied to the series group is reversed by the winding driving circuit, the rotation of the second rotor 11 enters the next cycle, thus, the second rotor 11 is continuously rotated.
In the embodiment, as the third fan-shaped pole shoe 21-2-1 is cut at the outer side end of one second pole shoe 21-2 at the same side of each group of two second pole shoes 21-2, and the length of the outer side arc of the third fan-shaped pole shoe 21-2-1 is 0.07 times of the length of the outer side arc of the original second pole shoe 21-2, the vibration and the noise generated by the motor are very small.
Example 3:
referring to fig. 3, in this embodiment, the inner rotor type single-phase brushless dc motor is provided, the number of poles of the fourth stator 22 is 4, 4 fourth pole shoes 22-2 are provided, the outer arc lengths of the fourth pole shoes 22-2 are the same, every two adjacent fourth pole shoes 22-2 are in one group, a fifth sector pole shoe 22-2-1 with the same size and shape is cut off from the outer end of the fourth pole shoe 22-2 on the same side of one of the fourth pole shoes 22-2 in each group, and in this embodiment, the outer arc length of the fifth sector pole shoe 22-2-1 is 0.09 times the outer arc length of the original fourth pole shoe 22-2. Each group of two fourth stator cores 22-1 are respectively provided with a second forward winding 32-1 and a second reverse winding 32-2 which have the same number of turns and are connected in series in the same way, the number of turns of each winding is 400, and two series groups of the second forward winding 32-1 and the second reverse winding 32-2 of each group of the fourth stator cores 22-1 are sequentially connected in series to obtain a head lead-out wire E and a tail lead-out wire F and are connected with the output end of the winding driving circuit.
The third rotor 12 is composed of N, S poles arranged alternately, and third rotor poles 12-1 of permanent magnets of a sector, the diameter of the third rotor 12 is phi 68mm, the length of the outer circular arc of each third rotor pole 12-1 of the third rotor 12 is equal, in this embodiment, the number of the third rotor poles 12-1 is 4, the gap between the third rotor pole 12-1 and the fourth pole shoe 22-2 is equal, and in this embodiment, the selected gap is 0.6 mm. The rotor magnetic pole polarity detector 4 is provided outside the third rotor magnetic pole 12-1 in the vicinity of any one of the third rotor magnetic poles N, S pole interfaces 12-2 of the third rotor 12.
The working principle, working process and resulting positive effects of the brushless dc motor of this embodiment are substantially the same as those of embodiment 2, and are not further described herein.

Claims (6)

1. The utility model provides a brushless DC motor changes, stator structure, includes the rotor that comprises N, S permanent magnet magnetic poles of utmost point alternate arrangement, sector, the inboard circular arc length or the outside circular arc length of each magnetic pole of rotor equals, with the concentric stator core of rotor be equipped with the same and one-to-one pole shoe of rotor magnetic pole quantity, the pole shoe is the sector and the outside circular arc length of each pole shoe equals, the rotor magnetic pole with the clearance between the stator core pole shoe is the equidistant, the quantity of stator core pole shoe is 2 x (2 ~ 12 positive integer), its characterized in that: every two adjacent stator core pole shoes are in a group, and a part of sector pole shoes with the same size and shape are cut off at the outer side end of one stator core pole shoe on the same side of each group of stator core pole shoes; each group of two stator cores are respectively provided with a forward winding and a reverse winding which are connected in series in the same arrangement mode, and the series groups of the forward winding and the reverse winding of each group of stator cores are sequentially connected in series to obtain a head outgoing line and a tail outgoing line which are connected with the output end of the winding driving circuit; and a rotor magnetic pole polarity detector is arranged outside the magnetic pole near any N, S pole interface of the rotor, and the polarity of the rotor magnetic pole is the same as that of the rotor magnetic pole corresponding to the pole shoe of the sector which is cut off partially.
2. The structure of the rotor and stator of the brushless dc motor according to claim 1, wherein: the length of the outer side arc of the cut part of the fan-shaped pole shoe is 0.05-0.12 time of the length of the outer side arc of the original pole shoe.
3. The structure of the rotor and stator of the brushless dc motor according to claim 1, wherein: the rotor is arranged in the center of a pole shoe of the stator core to form an inner rotor structure.
4. The structure of the rotor and stator of the brushless dc motor according to claim 1, wherein: the rotor is arranged on the periphery of a pole shoe of the stator core to form an outer rotor structure.
5. The structure of the rotor and stator of the brushless dc motor according to claim 1, wherein: and the gap between the rotor magnetic pole and the stator core pole shoe is in the range of 0.2-0.8 mm.
6. The structure of the rotor and stator of the brushless dc motor according to claim 1, wherein: the winding driving circuit supplies a forward or reverse current to the winding in accordance with the detection of the different N or S polarity of the rotor magnetic pole by the rotor magnetic pole polarity detector.
CN202210033986.7A 2022-01-12 2022-01-12 Brushless DC motor rotor and stator structure Withdrawn CN114374286A (en)

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Application Number Priority Date Filing Date Title
CN202210033986.7A CN114374286A (en) 2022-01-12 2022-01-12 Brushless DC motor rotor and stator structure

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704567A (en) * 1985-09-25 1987-11-03 Matsushita Electric Works, Ltd. Brushless D.C. motor having alternating wider and narrower pole shoes
JPH07227073A (en) * 1994-02-07 1995-08-22 Nippon Densan Corp Brushless motor
CN107947517A (en) * 2017-12-29 2018-04-20 深圳市正德智控股份有限公司 Field frame assembly and single-phase brushless direct-current motor
CN113675963A (en) * 2020-05-13 2021-11-19 佛山市威灵洗涤电机制造有限公司 Stator punching sheet, stator with same, motor and electrical equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704567A (en) * 1985-09-25 1987-11-03 Matsushita Electric Works, Ltd. Brushless D.C. motor having alternating wider and narrower pole shoes
JPH07227073A (en) * 1994-02-07 1995-08-22 Nippon Densan Corp Brushless motor
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