CN115714489A - Hybrid winding permanent magnet reluctance brushless motor and driving method thereof - Google Patents
Hybrid winding permanent magnet reluctance brushless motor and driving method thereof Download PDFInfo
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- CN115714489A CN115714489A CN202211433676.0A CN202211433676A CN115714489A CN 115714489 A CN115714489 A CN 115714489A CN 202211433676 A CN202211433676 A CN 202211433676A CN 115714489 A CN115714489 A CN 115714489A
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Abstract
The invention provides a mixed winding permanent magnet reluctance brushless motor and a driving method thereof, and the mixed winding permanent magnet reluctance brushless motor comprises a rotor outer frame, a rotor iron core, a plurality of rotor reluctance poles, a permanent magnet, a stator shaft, a plurality of stator iron cores and three winding bodies; one S-pole permanent magnet and the other N-pole permanent magnet of the two permanent magnets are connected in series; the three winding bodies have a winding common connection point; each winding body comprises three windings, wherein one winding is an independent winding, the other two windings are connected in series, and the series windings are distributed on two sides of the independent winding; the series windings in each winding body are in phase and connected end to end, and the independent windings are connected with the input and output of the series windings in anti-phase parallel. According to the invention, each phase of the winding body is connected in series and in parallel, so that both torque and speed are taken into consideration; the existence of rotor magnetic resistance pole makes the motor moment of torsion bigger, and is less to the permanent magnet requirement, the automatic characteristics of laminating of centrifugal force of rotor.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a hybrid winding permanent magnet reluctance brushless motor and a driving method thereof.
Background
The brushless motor is a novel direct current motor, and the working principle of the brushless motor is that an electronic switching device is used for replacing an old contact type commutator and an old brush, so that the brushless motor has higher reliability, and mechanical noise can be reduced.
Various intelligent power equipment in the existing market generates under the demand of follow-up height to the motor, and the motor system volume that it required the power source is littleer, and power density is bigger, and the rotational speed is higher.
Therefore, it is necessary to design a new brushless motor.
Disclosure of Invention
The invention aims to provide a hybrid winding permanent magnet reluctance brushless motor and a driving method thereof, wherein each phase of a winding body is connected in series, and the hybrid winding permanent magnet reluctance brushless motor can obtain larger torque at low speed.
The invention provides a mixed winding permanent magnet reluctance brushless motor which comprises a rotor outer frame, a rotor iron core, a plurality of rotor reluctance poles, two permanent magnets, a stator shaft, a plurality of stator iron cores and three winding bodies, wherein the rotor iron core is positioned in the rotor outer frame; one S-pole permanent magnet and the other N-pole permanent magnet of the two permanent magnets; the three winding bodies have a winding common connection point; each winding body comprises three windings, wherein one winding is an independent winding, the other two windings are connected in series, and the series windings are distributed on two sides of the independent winding; the series windings in each winding body are in phase and connected end to end, and the independent windings are connected with the input and output of the series windings in anti-phase parallel.
Furthermore, the permanent magnets are distributed on two sides of the rotor reluctance poles, the magnetic poles of the permanent magnets positioned on two sides of each rotor reluctance pole are the same, and the magnetic poles of the permanent magnets on the outer sides of two adjacent rotor reluctance poles are different.
Furthermore, the permanent magnets on two sides of each rotor reluctance pole are arranged in a V shape.
Further, both sides of each permanent magnet group are closed.
Further, gaps are formed between adjacent groups of permanent magnet groups, and notches are formed between adjacent rotor reluctance poles.
Further, the three winding bodies are respectively an A-phase winding body, a B-phase winding body and a C-phase winding body, wherein the A-phase winding body comprises an A-phase first sub-winding, an A-phase independent winding and an A-phase second sub-winding, the A-phase first sub-winding and the A-phase second sub-winding are connected in series and have the same direction, and the A-phase first sub-winding and the A-phase second sub-winding are connected in series and then connected with the A-phase independent winding in parallel end to end; the winding body of the phase B comprises a first sub-winding of the phase B, an independent winding of the phase B and a second sub-winding of the phase B, wherein the first sub-winding of the phase B and the second sub-winding of the phase B are connected in series and have the same direction; the C-phase winding body comprises a C-phase first sub-winding, a C-phase independent winding and a C-phase second sub-winding, the C-phase first sub-winding and the C-phase second sub-winding are connected in series and have the same direction, and the C-phase first sub-winding and the C-phase second sub-winding are connected in series and then connected with the C-phase independent winding in parallel end to end; one end of each winding is connected together to form a winding common connection point, and the other end of each winding is connected with three input phases of the brushless motor respectively.
Further, the number of winding turns of the independent winding is the sum of the number of turns of the corresponding two series windings.
Furthermore, the stator core also comprises a plurality of stator slots connected with the stator shaft, and the stator cores are fixed in the corresponding stator slots.
Further, the number of the stator slots is an integral multiple of 9 or 9, and the number of the rotor reluctance poles is an integral multiple of 8 and 10 or 8 and 10 as the stator slots.
The invention also provides a driving method of the hybrid winding permanent magnet reluctance brushless motor, which comprises the following specific steps: when the winding generates electromagnetic force, the permanent magnet and the magnetic resistance pole of the magnetic conduction rotor are attracted at the same time, larger pulling force is generated, and the torque is increased.
The invention adopts the placement of the composite winding body and the permanent magnet, and each phase of the winding body is connected in series and in parallel, so that the torque and the speed are both considered; the motor has the characteristics that the motor has larger torque and smaller requirement on a permanent magnet due to the existence of the rotor reluctance pole, and the centrifugal force of the rotor is automatically attached, so that the higher the rotor rotating speed is, the more the rotor tends to be stable; the invention can obtain the advantages of larger torque at low speed, smaller current when the motor is started to block rotation or at low speed, easier realization of high rotating speed, maintenance of low-speed torque and higher rotating speed, higher stability at high speed and larger power density at the same volume.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily to scale. In the drawings:
FIG. 1 is a schematic diagram of a hybrid winding permanent magnet reluctance brushless motor for use in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a rotor core lamination for a hybrid winding permanent magnet reluctance brushless motor according to an embodiment of the present invention;
fig. 3 is a simplified schematic diagram of a winding package for a hybrid winding permanent magnet reluctance brushless motor according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a two-end closed pattern of permanent magnets of a hybrid winding permanent magnet reluctance brushless motor according to an embodiment of the present invention.
Detailed Description
The invention discloses a mixed winding permanent magnet reluctance brushless motor, which comprises a rotor outer frame 10, a rotor core 20 positioned in the rotor outer frame 10, a plurality of rotor reluctance poles 30 positioned in the rotor core 20 and having a magnetic conduction function, two permanent magnets 40 positioned between the adjacent rotor reluctance poles 30, a stator shaft 50 positioned in the rotor outer frame 10, a plurality of stator slots 51 connected with the stator shaft 50, a plurality of stator cores 60 fixed on the stator shaft 50 and positioned in the stator slots 51, and three winding bodies wound on the stator cores 60, wherein the rotor core 20 is positioned in the rotor outer frame 10; the three winding bodies are provided with a winding common connection point O, each winding body comprises three windings, one winding is an independent winding, the other two windings are connected in series, and the series windings are distributed on two sides of the independent winding; the series windings in each winding body are in phase and connected end to end, and the independent windings are connected with the input and output of the series windings in anti-phase parallel. The rotor core 20 is formed by stacking magnetic soft magnetic material stamped pieces, such as silicon steel sheets.
The number of permanent magnets 40 is a multiple of 2, and in the present embodiment, the number of permanent magnets 40 is 16.
The permanent magnets 40 are distributed on two sides of the rotor reluctance poles 30, magnetic poles of the permanent magnets 40 on two sides of each rotor reluctance pole 30 are the same (namely, the permanent magnets are S-pole permanent magnets or N-pole permanent magnets), magnetic poles of the permanent magnets on the outer sides of two adjacent rotor reluctance poles 30 are different (namely, one permanent magnet is an S-pole permanent magnet, and the other permanent magnet is an N-pole permanent magnet), and the permanent magnets on two sides of each rotor reluctance pole 30 are arranged in a V shape.
Both sides of each permanent magnet group may be closed (as shown in fig. 4) to increase the strength of rotor core 20; the permanent magnets 40 are arranged in a V shape, and gaps 41 are formed between adjacent groups of permanent magnet groups; and notches 31 are formed between adjacent rotor magnetic resistance poles 30 and are used for blocking direct magnetic lines of force between the S-pole permanent magnet and the N-pole permanent magnet of each permanent magnet group.
The number of rotor reluctance poles 30 is equal to half the number of groups of permanent magnets 40.
The motor depends on the force induced by the permanent magnet 40 and the rotor reluctance pole 30 to act on the rotor core 20 together to do relative rotation movement, and has the advantages of large torque, small current and high rotating speed.
The number of stator slots 51 is an integer multiple of 9 or 9 and the number of rotor reluctance poles 30 is an integer multiple of 8 and 10 or 8 and 10 as well as the stator slots. One end of the stator core 60 is fixed to the stator shaft 50, and the other end of the stator core 60 corresponds to the permanent magnet 40.
The number of the stator cores 60 is 9, and one winding is wound on each stator core 60; each stator core 60 is located between adjacent sets of permanent magnets.
Each winding body comprises 3 windings, wherein one winding is an independent winding, and the other two windings are connected in series. Since each winding body needs at least 3 windings, in a multi-winding 3-phase brushless motor, the minimum number of stator slot poles is 9 multiplied by n, and n is an integer larger than 1.
The three winding bodies are respectively an A-phase winding body, a B-phase winding body and a C-phase winding body. The A-phase winding body comprises an A-phase first sub-winding LA1, an A-phase independent winding LA and an A-phase second sub-winding LA2, the A-phase first sub-winding LA1 and the A-phase second sub-winding LA2 are connected in series and have the same direction, and the A-phase first sub-winding LA1 and the A-phase second sub-winding LA2 are connected in series and then connected with the A-phase independent winding LA in parallel end to end; the B-phase winding body comprises a B-phase first sub-winding LB1, a B-phase independent winding LB and a B-phase second sub-winding LB2, wherein the B-phase first sub-winding LB1 and the B-phase second sub-winding LB2 are connected in series and then connected with the B-phase independent winding LB in parallel end to end; the C-phase winding body comprises a C-phase first sub-winding LC1, a C-phase independent winding LC and a C-phase second sub-winding LC2, the C-phase first sub-winding LC1 and the C-phase second sub-winding LC2 are connected in series and have the same direction, and the C-phase first sub-winding LC1 and the C-phase second sub-winding LC2 are connected in series and then connected in parallel with the C-phase independent winding LC in end-to-end mode.
One ends of all the windings are connected together to form a winding common connection point O, and the other ends of the windings are respectively connected with three input phases of the brushless motor.
The 3 windings of each winding body are continuously arranged, the independent windings (namely the A-phase first independent winding LA, the B-phase first independent winding LB and the C-phase first independent winding LC) are positioned in the middle, and the series windings are distributed on two sides of the independent windings; the series windings in each winding body are in the same phase and are connected end to end, and the independent windings are connected with the input end and the output end of the series windings in parallel in an anti-phase mode.
The number of turns of the independent winding is the sum of the number of turns of the two series windings; the output ends of the A-phase winding body, the B-phase winding body and the C-phase winding body are connected together and are a winding common connection point O to form star connection.
Two adjacent permanent magnets 40 with the same polarity are arranged in a V shape to form a magnetic resistance pole, and when the winding generates electromagnetic force, the permanent magnets 40 and the magnetic resistance pole 30 of the rotor can be attracted at the same time to generate larger pulling force, so that the torque is increased.
The invention also discloses a driving method of the hybrid winding permanent magnet reluctance brushless motor, which comprises the following steps:
for the rotor part, when the windings generate electromagnetic force, the permanent magnets 40 and the magnetic conductive rotor reluctance poles 30 can be attracted at the same time, generating a greater pulling force, thereby increasing torque.
For the winding part, the motor of the invention consists of a plurality of windings and permanent magnets 40, so that more copper wires are wound on each winding to obtain larger torsion, because the windings and the rotor reluctance poles 30 gradually fade out when moving relatively, induction current can be generated, and harmful circulating current can be generated by the existence of the potential difference between the head and the tail of one phase winding, the best method for eliminating the circulating current is to connect a plurality of windings of one phase in series, but the low-speed torque and the high speed can only be selected by 2, if the head and the tail windings of one phase are connected in series, and the middle winding is connected with the middle winding in parallel, the contradiction can be solved.
The invention is suitable for multi-magnetic pole and multi-slot pole brushless motors, and only needs smaller current when outputting the same low-speed torque.
The invention is suitable for the permanent magnet with the number of stages as follows: (9 plus 1 or minus 1) times n, n being a multiple of the number of slot poles.
The invention is not only suitable for the outer rotor permanent magnet brushless motor, but also suitable for the inner rotor brushless motor; the motor of the invention can be driven by a phase sensor or not; the permanent magnet and the rotor iron core automatically cling to the rotor outer frame due to centrifugal force when the rotating speed is high, so that the stability is higher; the permanent magnet sensitive to temperature is positioned at the periphery of the motor, and the heat dissipation condition has better effect compared with the traditional inner rotor with the mixture of the magnetic resistance and the permanent magnet.
The invention adopts the placement of the composite winding body and the permanent magnet, and each phase of the winding body is connected in series and in parallel, so that the torque and the speed are both considered; the existence of the rotor reluctance pole enables the motor torque to be larger, the requirement on the permanent magnet to be smaller, and the centrifugal force of the rotor is automatically attached, so that the higher the rotor rotating speed is, the more stable the rotor rotating speed is; the invention can obtain the advantages of larger torque at low speed, smaller current when the motor is started to block rotation or at low speed, easier realization of high rotating speed, maintenance of low-speed torque and higher rotating speed, higher stability at high speed and larger power density at the same volume.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A mixed winding permanent magnet reluctance brushless motor is characterized by comprising a rotor outer frame (10), a rotor core (20) positioned in the rotor outer frame (10), a plurality of rotor reluctance poles (30) positioned in the rotor core (20), two permanent magnets (40) positioned between adjacent rotor reluctance poles (30), a stator shaft (50) positioned in the rotor outer frame (10), a plurality of stator cores (60) which are fixed on the stator shaft (50) and are arranged corresponding to the permanent magnets (40), and three winding bodies wound on the plurality of stator cores (60); wherein one of the two permanent magnets (40) is an S-pole permanent magnet and the other is an N-pole permanent magnet; the three winding bodies have a winding common connection point; each winding body comprises three windings, wherein one winding is an independent winding, the other two windings are connected in series, and the series windings are distributed on two sides of the independent winding; the series windings in each winding body are in the same phase and are connected end to end, and the independent windings are connected with the input end and the output end of the series windings in parallel in an anti-phase mode.
2. The hybrid winding permanent magnet reluctance brushless motor according to claim 1, wherein the permanent magnets (40) are distributed on both sides of the rotor reluctance poles (30), and the magnetic poles of the permanent magnets (40) on both sides of each rotor reluctance pole (30) are the same, and the magnetic poles of the permanent magnets on the outer sides of two adjacent rotor reluctance poles (30) are different.
3. Hybrid winding permanent magnet reluctance brushless motor according to claim 1, characterized in that the permanent magnets on both sides of each rotor reluctance pole (30) are arranged in a V-shape.
4. The hybrid winding permanent magnet reluctance brushless motor of claim 1, wherein each set of permanent magnets is closed on both sides.
5. The hybrid winding permanent magnet reluctance brushless motor of claim 1, wherein adjacent groups of permanent magnet groups have gaps between them and adjacent rotor reluctance poles have notches between them.
6. The hybrid winding permanent magnet reluctance brushless motor according to claim 1, wherein the three winding bodies are an a-phase winding body, a B-phase winding body and a C-phase winding body, respectively, wherein the a-phase winding body comprises an a-phase first sub-winding, an a-phase independent winding and an a-phase second sub-winding, the a-phase first sub-winding and the a-phase second sub-winding are connected in series and have the same direction, and the a-phase first sub-winding and the a-phase second sub-winding are connected in series and then connected end to end with the a-phase independent winding in parallel; the winding body of the phase B comprises a first sub-winding of the phase B, an independent winding of the phase B and a second sub-winding of the phase B, wherein the first sub-winding of the phase B and the second sub-winding of the phase B are connected in series and have the same direction; the C-phase winding body comprises a C-phase first sub-winding, a C-phase independent winding and a C-phase second sub-winding, the C-phase first sub-winding and the C-phase second sub-winding are connected in series and are in the same direction, the C-phase first sub-winding and the C-phase second sub-winding are connected in series and then are connected with the C-phase independent winding in parallel end to end, one ends of all the windings are connected together to form a common winding connection point, and the other ends of the windings are connected with three input phases of the brushless motor respectively.
7. The hybrid winding permanent magnet reluctance brushless motor of claim 1 or 6, wherein the number of winding turns of the independent winding is the sum of the number of turns of the corresponding two windings connected in series.
8. The hybrid winding permanent magnet reluctance brushless motor of claim 1, further comprising a plurality of stator slots connected to the stator shaft (50), the stator cores being fixed in the corresponding stator slots.
9. The hybrid winding permanent magnet reluctance brushless motor of claim 6, wherein the number of stator slots is 9 or an integer multiple of 9, and the number of rotor reluctance poles is 8 and 10 or an integer multiple of 8 and 10 being the same as the stator slots.
10. The driving method of the hybrid winding permanent magnet reluctance brushless motor according to any one of claims 1 to 9, wherein the specific method is as follows:
when the winding generates electromagnetic force, the permanent magnet and the magnetic resistance pole of the magnetic conduction rotor are attracted at the same time, larger pulling force is generated, and the torque is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211433676.0A CN115714489A (en) | 2022-11-16 | 2022-11-16 | Hybrid winding permanent magnet reluctance brushless motor and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211433676.0A CN115714489A (en) | 2022-11-16 | 2022-11-16 | Hybrid winding permanent magnet reluctance brushless motor and driving method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115714489A true CN115714489A (en) | 2023-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211433676.0A Pending CN115714489A (en) | 2022-11-16 | 2022-11-16 | Hybrid winding permanent magnet reluctance brushless motor and driving method thereof |
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| CN (1) | CN115714489A (en) |
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- 2022-11-16 CN CN202211433676.0A patent/CN115714489A/en active Pending
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