CN111106732B - Linear motor and primary winding thereof - Google Patents
Linear motor and primary winding thereof Download PDFInfo
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- CN111106732B CN111106732B CN201811249284.2A CN201811249284A CN111106732B CN 111106732 B CN111106732 B CN 111106732B CN 201811249284 A CN201811249284 A CN 201811249284A CN 111106732 B CN111106732 B CN 111106732B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/025—Asynchronous motors
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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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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- 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
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Linear Motors (AREA)
Abstract
The present invention provides in a first aspect a linear electric motor comprising a primary assembly and a secondary assembly, the primary assembly comprising: m-phase primary windings and a primary core, wherein m is a positive integer, each phase winding includes a plurality of coils connected in series with each other, the primary core has a plurality of slots arranged along an extension direction of the linear motor, the slots are used for accommodating the coils: the coil sides of the linear motor in adjacent slots of the same pole and the same phase can have different numbers of turns. By adopting the technical scheme of the invention, the performance index can be improved without changing the primary iron core structure of the linear motor of the existing medium-low speed magnetic levitation vehicle or linear motor driven wheel rail vehicle. The invention also provides a primary winding of the linear motor.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a linear motor for the field of rail transit, and particularly relates to a short-stator linear asynchronous motor.
Background
The magnetic suspension train is a train system adopting a non-contact electromagnetic suspension, guiding and driving system. The train is suspended in the air and guided by means of electromagnetic attraction or electric repulsion, so that the train is in mechanical contact with the ground track, and the linear motor is used for driving the train to run. The magnetic suspension train is divided according to the running speed of the train, and can be divided into two types of high speed and medium-low speed: the highest running speed of the high-speed maglev train can reach more than 500km/h, two suspension modes of EMS and EDS are adopted, and the high-speed maglev train is suitable for passenger transportation between a long and large trunk line and a large city; the running speed of the medium-low speed maglev train is about 100km/h, an EMS suspension mode is mainly adopted, and the medium-low speed maglev train is particularly suitable for transportation inside cities or between cities and satellite cities.
The working principle of the existing medium-low speed maglev train is as follows: the suspension force of the train is provided by a suspension system, an electromagnet arranged at the lower part of the train body attracts the lower part of the F-shaped steel rail and reacts with the F-shaped steel rail to float the train, and the gap between the electromagnet and the rail is controlled by a gap sensor to control the current value so as to ensure the constancy of the suspension force and the gap; the traction force is realized by a linear induction motor on a medium-low speed maglev train, a VVVF inverter is carried on the vehicle to supply power to the linear induction motor, a traveling wave magnetic field which moves linearly is generated in a coil of the linear induction motor, an aluminum plate is arranged on the side of an induction track, induction eddy current is generated in the aluminum plate, and the eddy current field and the traveling wave magnetic field interact to generate the traction force required by the vehicle movement.
The three-phase impedance is asymmetric due to the disconnection of the primary iron core of the linear asynchronous motor, and each phase of winding is suitable for being connected in series (the number of parallel branches is 1) but not suitable for being connected in parallel (large circulation current can be generated among different parallel branches); the limitation of the series-parallel connection mode of the primary winding brings unfavorable factors to the improvement of the performance of the linear asynchronous motor. The reason is as follows:
1) due to the structural particularity of the linear asynchronous motor, the primary windings of the linear asynchronous motor adopt a series connection mode but cannot adopt a parallel connection mode;
2) in the prior art, the number of turns of a primary winding is divided into two structures of 3 turns and 2 turns, and the two structures have obvious advantages and disadvantages: as shown in the figure, when the number of turns of the primary winding is 3, the number of turns of each phase in series is more, and higher traction force can be provided by smaller current at a low-speed section; but in a high-speed section, constant voltage output is realized, the number of turns of a winding is large, reactance components are large, current is small, the exerted traction force is small, and the high-speed traction capability is weaker;
when the number of turns of the primary winding is 2, the number of turns of each phase in series is small, and traction force needs to be provided by large current at a low-speed stage of a train, but the traction force is limited by the output current of the inverter and can not meet the requirement of the whole train; in a high-speed section, constant voltage output is realized, the number of turns of a winding is small, the reactance component is small, the current is large, higher traction force can be exerted, and the high-speed traction capacity is strong.
Disclosure of Invention
In order to solve the problems in the prior art, the linear motor provided by the invention has the advantages that the primary winding structure of the linear asynchronous motor is optimized, the performance of the linear asynchronous motor can play higher traction performance in both a low-speed section and a high-speed section so as to improve the performance index of the linear motor, meanwhile, the structure and the process are simple, and the manufacturing cost cannot be obviously increased.
The invention provides a linear motor, which is a P-pole motor, wherein P is a positive integer more than 2, the linear motor comprises a primary component and a secondary component, and the primary component comprises: the primary winding is m phase windings, wherein m is a positive integer, each phase winding comprises a plurality of coils which are connected in series, the primary core is provided with a plurality of grooves which are arranged along the extension direction of the linear motor at intervals of a primary groove distance, and the grooves are used for accommodating the coils: the linear motor has 1 st coil side to q th coil side in q adjacent slots of the same pole and the same phase, and the 1 st coil side to the q th coil side can have k different numbers of turns, wherein q and k are positive integers of 2 or more.
Preferably, m is an integer multiple of 3.
Preferably, the 1 st coil side to the q-th coil side can have two different numbers of turns.
Preferably, the number of turns of the coil sides of a plurality of coils connected in series with one another in turn constitutes a sequence with a period.
Preferably, each of the 1 st coil side to the q-th coil side has a different number of turns from another coil side in an adjacent slot of the slot.
Preferably, when q is 3, the number of turns of the 1 st coil side, the 2 nd coil side and the 3 rd coil side in the adjacent 3 slots of the same pole and the same phase of the linear motor is 2, 3, 2 or 3, 2, 3 respectively.
Preferably, the primary winding is an n-layer winding, where n is a positive integer greater than 2, and the n coil sides in each slot have different numbers of turns.
A second aspect of the present invention provides a primary winding of a linear motor, the primary winding including a plurality of coils connected in series with each other, respective coil sides of the plurality of coils being disposed in a plurality of primary slots of the linear motor, the number of turns of the respective coil sides being different.
Preferably, the number of turns of the respective coil sides in turn constitutes a sequence with a period.
The invention has the beneficial effects that:
by adopting the technical scheme of the invention, the primary iron core structure of the linear induction motor is not changed on the premise that the output current of the inverter is constant, and the primary winding structure of the linear induction motor is optimized, so that the linear asynchronous motor can exert better traction performance in both a low-speed section and a high-speed section, and better motor force performance indexes of the linear induction motor are exerted.
Drawings
The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. It is to be noted that the appended drawings are intended as examples of the claimed invention. In the drawings, like reference characters designate the same or similar elements.
Fig. 1 shows a schematic diagram of a primary winding distribution of a prior art linear motor;
FIG. 2 is a partial schematic view of a prior art under-pole primary winding distribution for a linear motor;
fig. 3 is a schematic diagram showing a winding distribution when the number of primary winding turns of a linear motor is 2 in the prior art;
fig. 4 is a schematic diagram showing a winding distribution when the number of primary winding turns of a linear motor is 3 in the prior art;
fig. 5 is a partial schematic view showing a distribution of primary windings under a pair of poles of a linear motor according to a first embodiment of the present invention;
fig. 6 shows a partial schematic view of a pair of under-pole primary winding distribution of a linear motor according to a second embodiment of the present invention.
Detailed Description
The detailed features and advantages of the present invention are described in detail in the detailed description which follows, and will be sufficient for anyone skilled in the art to understand the technical content of the present invention and to implement the present invention, and the related objects and advantages of the present invention will be easily understood by those skilled in the art from the description, claims and drawings disclosed in the present specification.
The present invention provides in a first aspect a linear electric motor which may be a 2, 4 or more pole motor, the linear electric motor comprising a primary assembly 20 and a secondary assembly (not shown), the primary assembly 20 comprising: the primary winding, which in this embodiment is an A, B, C three-phase ac winding, may be a two-phase winding, a six-phase winding, etc. Each phase winding includes a plurality of coils connected in series with each other.
The primary core has a plurality of slots s arranged along an extending direction of the linear motor, the slots being for seating coils. As shown in fig. 3 to 6, the 1 st to 3 rd coil sides q1, q2 and q3 are provided in 3 adjacent slots of the same pole (N pole as shown in fig. 3) and the same phase (B phase as shown in fig. 3) of the linear motor, respectively. In fig. 5 and 6 showing the primary winding of the linear motor of the present invention, the 1 st coil side to the 3 rd coil have 2 turns, 3 turns, 2 turns, or 3 turns, 2 turns, 3 turns, respectively. That is, the 1 st coil side to the 3 rd coil side can have two different numbers of turns. Here, the case where, when q is 3, the number of turns of the 1 st coil side, the 2 nd coil side, and the 3 rd coil side respectively in the adjacent 3 slots of the same pole and the same phase of the linear motor is 2, 3, 2, and 3, 2, 3 respectively is exemplarily shown; however, the magnetic flux required for the linear motor is determined according to the traction force and levitation force required by the maglev train, and the corresponding number of winding turns is designed according to the magnetic flux required for the linear motor. Thus, the specific number of turns herein is not limited to 2 or 3 nor to only two values, e.g., the 1 st coil side to the 3 rd coil side can have different numbers of turns, respectively, to form a sequence of numbers of turns, e.g., 1, 2, 3 with three values or 4, 6, 4, etc. with more turns. The number q of slots per pole and phase is calculated according to the total number of slots of the stator, the number of pole pairs of the linear motor, the number of phases of the linear motor and the like, and can be any value above 2 according to practical use requirements, so the turn sequence of the invention can be a sequence with any length, for example, when the number q of turns per pole and phase is 4, the turn sequence can be 2, 3, 2 and 3.
Preferably, the number of turns of the coil sides of a plurality of coils connected in series with one another in turn constitutes a sequence with a period. In other words, for the phase a winding, a winding coil is wound by using a 3-2-3-2 turn alternating and repeated turn number sequence, and here, the "3-2 turns" can be taken as one period. This makes the number of coil turns uniformly distributed over the entire in the extending direction of the linear motor to avoid uneven distribution of magnetic flux, asymmetry of three-phase impedance, and the like.
As can be seen from fig. 5 to 6, each of the 1 st to 3 rd coil sides of the present invention has a different number of turns from the other coil side in the slot adjacent thereto, for example, the slot s1 adjacent to the P-pole C phase in fig. 5 has a different number of slots from the slot s2, and the upper and lower coil sides in each slot have different numbers of turns since the primary winding is a double-layer winding. This allows the total number of coils in each slot to be kept constant, thus improving the magnetic flux by simply changing the winding method of the winding based on the use of the existing primary core lamination, without providing the core lamination for which the tooth space of the primary core is enlarged, and improving the adaptability of the present invention.
In another aspect, the present invention provides a primary winding of a linear motor, the primary winding including a plurality of coils connected in series with each other, respective coil sides of the plurality of coils being disposed in a plurality of primary slots of the linear motor, the number of turns of the respective coil sides being different. Preferably, the number of turns of the respective coil sides in turn constitutes a sequence with a period. The primary winding is the primary winding used in the linear motor of the present invention as described above. And will not be described in detail herein.
The advantages of the present invention over the prior art will be described in detail below with reference to fig. 2 to 6.
At present, a linear motor applied to a medium-low speed magnetic levitation vehicle or a wheel-track vehicle driven by a linear asynchronous motor is a short-stator linear asynchronous motor, and fig. 3 and 4 respectively show a primary winding distribution schematic diagram when the number of primary winding turns is 2 turns and 3 turns. As can be seen from fig. 3, when the number of coil turns is 2, the number of turns in series of each phase under each pair of poles is 24; with 3 coil turns, the number of turns in series per phase under each pair of poles is 36.
In the primary winding structure as shown in fig. 5 and 6, the slot size of the primary punching sheet can be kept unchanged, the number of slots of each phase of each pole is unchanged, and only the structure of the primary coil is changed, so that the number of turns of each phase of the coil under a pair of poles is 30. Compared with the technical scheme that the number of turns of the primary winding is 2 in fig. 3, the technical scheme provided by the invention has more turns per pole per phase, so that under the condition of certain inversion output current capacity, more turns provide more magnetic flux linkage, and the traction force provided by a low-speed section is larger; compared with the technical scheme that the number of turns of the primary winding is 3 in fig. 4, the number of turns of each phase of each pole is less in the technical scheme provided by the invention; therefore, when the inverter outputs constant voltage in a high-speed running section of the train, the motor current is larger, and the traction performance exerted in the high-speed running section is higher. Therefore, the technical scheme provided by the invention can play a higher traction performance in both the low-speed section and the high-speed section of the medium-low-speed maglev train or the wheel-track vehicle driven by the linear asynchronous motor.
Although the present invention has been described with reference to the present specific embodiments, it will be appreciated by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes and substitutions may be made without departing from the spirit of the invention, and therefore, it is intended that all changes and modifications to the above embodiments within the spirit and scope of the present invention be covered by the appended claims.
Claims (5)
1. A linear asynchronous motor is a P-pole motor, wherein P is a positive integer more than 2,
the linear asynchronous motor comprises a primary component and a secondary component, wherein the primary component comprises:
a primary winding that is an m-phase winding, where m is an integer multiple of 3, each phase winding including a plurality of coils connected in series with each other,
a primary core having a plurality of slots arranged at a primary slot pitch from each other along an extension direction of the linear asynchronous motor, the slots for seating the coils,
the method is characterized in that:
the q adjacent slots with the same pole and the same phase of the linear asynchronous motor are respectively provided with a 1 st coil side to a q-th coil side,
and the 1 st coil side to the q-th coil side have k different numbers of turns, where q, k are positive integers of 2 or more,
the number of turns of the coil sides of the plurality of coils connected in series with each other in turn constitutes a sequence having a period for each of the m phases.
2. A linear asynchronous machine according to claim 1, characterized in that:
the 1 st coil side to the q-th coil side can have two different numbers of turns.
3. A linear asynchronous machine according to claim 1 or 2, characterized in that:
each of the 1 st coil side to the q-th coil side has a different number of turns from another coil side in an adjacent slot of the slot.
4. A linear asynchronous machine according to claim 1, characterized in that:
when q is 3, the number of turns of the 1 st coil side, the 2 nd coil side and the 3 rd coil side in the adjacent 3 slots of the same pole and the same phase of the linear asynchronous motor is respectively 2, 3 and 2 or 3, 2 and 3.
5. A linear asynchronous machine according to claim 1, characterized in that:
the primary winding is n layers of windings, wherein n is a positive integer above 2, and n coil sides in each slot have different numbers of turns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811249284.2A CN111106732B (en) | 2018-10-25 | 2018-10-25 | Linear motor and primary winding thereof |
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| CN201811249284.2A CN111106732B (en) | 2018-10-25 | 2018-10-25 | Linear motor and primary winding thereof |
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| CN111106732A CN111106732A (en) | 2020-05-05 |
| CN111106732B true CN111106732B (en) | 2022-03-08 |
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| CN113036971A (en) * | 2021-03-05 | 2021-06-25 | 江苏聚磁电驱动科技有限公司 | Single-wire multilayer winding distribution structure of motor and high-performance motor applying same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993629A (en) * | 2015-06-29 | 2015-10-21 | 合肥工业大学 | Winding-type linear brushless doubly-fed generator |
| CN105284033A (en) * | 2013-04-11 | 2016-01-27 | 菲艾姆股份有限公司 | Electric machine |
| CN206948068U (en) * | 2017-04-26 | 2018-01-30 | 合肥巨一动力系统有限公司 | A kind of variable number of turn lenticular wire motor stator winding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2889361B2 (en) * | 1990-11-13 | 1999-05-10 | 株式会社東芝 | Three-phase armature winding |
| US5497038A (en) * | 1994-04-08 | 1996-03-05 | Power Paragon, Inc. | Linear motor propulsion drive coil |
| US7550892B2 (en) * | 2005-10-03 | 2009-06-23 | Ut-Battelle, Llc | High slot utilization systems for electric machines |
| CN100566096C (en) * | 2007-11-19 | 2009-12-02 | 哈尔滨工业大学 | Long stroke constant acceleration line electromotor and control method thereof |
| DE112012007152T5 (en) * | 2012-12-13 | 2015-08-13 | Mitsubishi Electric Corp. | Rotating electrical machine |
| JP6139256B2 (en) * | 2013-05-10 | 2017-05-31 | 株式会社東芝 | Armature winding of rotating electric machine |
| JP6117740B2 (en) * | 2014-06-18 | 2017-04-19 | ファナック株式会社 | 3-phase AC motor with torque ripple reduction structure |
| JP6227171B2 (en) * | 2015-01-16 | 2017-11-08 | 三菱電機株式会社 | Pole-switching rotating electrical machine and driving method for pole-switching rotating electrical machine |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105284033A (en) * | 2013-04-11 | 2016-01-27 | 菲艾姆股份有限公司 | Electric machine |
| CN104993629A (en) * | 2015-06-29 | 2015-10-21 | 合肥工业大学 | Winding-type linear brushless doubly-fed generator |
| CN206948068U (en) * | 2017-04-26 | 2018-01-30 | 合肥巨一动力系统有限公司 | A kind of variable number of turn lenticular wire motor stator winding |
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