CN104767351B - Highly modularized flat plate type multiphase permanent magnet linear motor - Google Patents
Highly modularized flat plate type multiphase permanent magnet linear motor Download PDFInfo
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- CN104767351B CN104767351B CN201510212416.4A CN201510212416A CN104767351B CN 104767351 B CN104767351 B CN 104767351B CN 201510212416 A CN201510212416 A CN 201510212416A CN 104767351 B CN104767351 B CN 104767351B
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Abstract
the invention discloses a highly-modularized flat plate type multiphase permanent magnet linear motor, belongs to the field of permanent magnet motors, and aims to solve the problems that the fault isolation difficulty is high when a conventional multiphase permanent magnet linear motor has faults such as winding short circuit and the like, and the motor modularization design difficulty is high due to high interphase electromagnetic coupling degree. The permanent magnet motor comprises a stator and a permanent magnet rotor, wherein the stator can be arranged on one side or two sides of the permanent magnet rotor, and an air gap is formed between the stator and the permanent magnet rotor; the stator is formed by splicing 2m stator modules, and the stator modules are spliced into a flat plate shape along the axial direction; each stator module comprises a stator iron core, an armature tooth, two fault-tolerant teeth and two concentrated windings; one-phase module of the highly modular flat plate type multiphase permanent magnet linear motor is composed of two adjacent stator modules; the permanent magnet rotor is formed by assembling a permanent magnet and a rotor iron core, and can be of a surface-mounted structure, a Halbach structure or an axial magnetizing structure and the like.
Description
Technical Field
The invention relates to a modular multiphase permanent magnet fault-tolerant motor, and belongs to the field of permanent magnet motors.
Background
the urban rail transit technology mainly has two technical modes, one mode is that a rotating motor and a gearbox are adopted to drive wheels, and the friction force between the wheels and rails is used for driving a vehicle to advance; the other is to use a linear motor drive system. Compared with the traditional rotating motor traction technology, the rail transit system based on the linear motor has better climbing capacity, does not need devices such as reduction gears and the like, has high freedom degree of bogie and line design and small tunnel excavation section, and is particularly suitable for cities with difficult selection of line positions and station positions, complex hydrogeological conditions and dense buildings along the line. Safety and reliability are critical to linear motor drive systems. At present, when a traditional three-phase permanent magnet linear motor has open-circuit or short-circuit faults of windings, the thrust output of the motor can be changed violently and even cannot work, and the thrust output of the motor can seriously affect the performance of an electric drive system. The multiphase permanent magnet linear motor has good fault-tolerant operation capability due to the redundancy of the number of phases, and is suitable for occasions with higher requirements on the reliability of an electric drive system, such as urban rail transit. The fault tolerance means that when a motor system fails, the control strategy of the motor is adjusted, so that the system can still maintain a certain output capacity, and meanwhile, the fault tolerance also has the capacity of preventing the fault deterioration and the fault diffusion in a fault state. By adopting the multiphase fault-tolerant permanent magnet linear motor, the train can continue to run under the condition that the motor fails until the failure is relieved, so that the safety and the reliability of a linear motor driving system are greatly improved.
In order to enable the motor to continue to operate in fault states such as open-circuit and short-circuit of windings, the multiphase fault-tolerant permanent magnet linear motor needs to meet the following conditions during design: good electrical, magnetic, thermal and physical isolation between phases is required. The multiphase permanent magnet linear motor adopting the conventional distributed winding or fractional slot concentrated winding has high interphase electromagnetic coupling degree, and when faults such as winding short circuit occur, the short circuit phase can affect other normal phases, so that the fault-tolerant control difficulty is increased. In addition, the motor adopting distributed winding or ordinary fractional slot winding is difficult to modularize the motor due to the space distribution problem of the winding.
Disclosure of Invention
the invention aims to solve the problems that the fault isolation difficulty is high when the conventional multiphase permanent magnet linear motor has faults such as winding short circuit and the like, and the motor modularization design difficulty is high due to high interphase electromagnetic coupling degree, and provides a highly-modularized flat plate type multiphase permanent magnet linear motor.
The invention relates to a highly modularized flat plate type multiphase permanent magnet linear motor, which comprises k stators and a permanent magnet rotor, wherein when k is 1 or 2, and k is 1, the stators are arranged on one side of the permanent magnet rotor; when k is 2, the two stators are symmetrically arranged at two sides of the permanent magnet rotor;
An air gap with the length of L is reserved between the stator and the permanent magnet rotor;
The stator is formed by splicing 2m stator modules, wherein m is the phase number of the motor, and the 2m stator modules are spliced into a stator with a flat plate structure along the axial direction; each stator module comprises a stator core and a concentrated winding; the stator core is provided with two fault-tolerant teeth and an armature tooth, the armature tooth is positioned between the two fault-tolerant teeth, and the length of the armature tooth along the axial direction is greater than that of the fault-tolerant teeth along the axial direction; the teeth together enclose two stator slots, and the stator slots are arranged facing the permanent magnet rotor; the stator core and the stator slot are both in a flat plate shape, and the concentrated winding is embedded in the stator slot and wound on the armature teeth;
From left to right, every two adjacent stator modules form a phase module of the motor, and the concentrated windings of the two stator modules in the same phase module have the same number of turns and opposite winding directions;
the permanent magnet rotor comprises a rotor iron core and a permanent magnet, wherein the rotor iron core and the permanent magnet are both in a flat plate shape, and the permanent magnet is arranged on the surface of the rotor iron core facing the stator; the permanent magnets are magnetized in a direction perpendicular to the plane of the air gap, and the magnetization directions of adjacent permanent magnets are alternately opposite.
The invention has the advantages that: the invention discloses a highly modularized flat plate type multiphase permanent magnet linear motor. Through the design of the windings and the adoption of the fault-tolerant teeth, good magnetic isolation effect is achieved among phases, and the influence of the fault of the motor on other phases in a fault state is effectively restrained. The highly modularized flat plate type multiphase permanent magnet linear motor stator adopts a modularized design mode, is beneficial to large-scale processing and manufacturing, can be rapidly replaced under the condition that a certain module breaks down, and reduces the maintenance cost of the system. The motor is a multi-phase motor body structure scheme with high reliability, high power density and low processing, manufacturing and maintenance cost. The invention is suitable for three-phase and above-three-phase multi-phase permanent magnet linear motors.
Drawings
FIG. 1 is a schematic structural diagram of a highly modular flat multiphase permanent magnet linear motor according to the present invention; the motor is of a single-side structure;
FIG. 2 is a schematic structural diagram of a highly modular flat multiphase permanent magnet linear motor according to the present invention; the motor is of a double-side structure;
FIG. 3 is a magnetic flux distribution with one phase stator winding energized;
FIG. 4 is a schematic structural diagram of a Halbach type rotor;
fig. 5 is a structural schematic diagram of an axially magnetized rotor.
Detailed Description
The first embodiment is as follows: the present embodiment is described below with reference to fig. 1 to 3, and the highly modular flat plate type multiphase permanent magnet linear motor according to the present embodiment includes k stators 1 and permanent magnet movers 2, where k is 1 or 2, and when k is 1, the stator 1 is disposed on one side of the permanent magnet mover 2; when k is 2, the two stators 1 are symmetrically arranged at two sides of the permanent magnet rotor 2;
an air gap with the length of L is reserved between the stator 1 and the permanent magnet rotor 2;
The stator 1 is formed by splicing 2m stator modules, wherein m is the phase number of the motor, and the 2m stator modules are spliced into the stator 1 with a flat plate structure along the axial direction; each stator module comprises a stator core 3 and a concentrated winding 5; two fault-tolerant teeth 3-1 and an armature tooth 3-2 are arranged on a stator iron core 3, the armature tooth 3-2 is positioned between the two fault-tolerant teeth 3-1, and the length of the armature tooth 3-2 along the axial direction is greater than that of the fault-tolerant teeth 3-1 along the axial direction; the teeth together enclose two stator slots 4, and the stator slots 4 are arranged facing the permanent magnet mover 2; the stator core 3 and the stator slot 4 are both flat plates, and the concentrated winding 5 is embedded in the stator slot 4 and wound on the armature teeth 3-2;
from left to right, every two adjacent stator modules form a phase module of the motor, and concentrated windings 5 of the two stator modules in the same phase module have the same number of turns and opposite winding directions;
The permanent magnet rotor 2 comprises a rotor iron core 6 and a permanent magnet 7, the rotor iron core 6 and the permanent magnet 7 are both in a flat plate shape, and the permanent magnet 7 is arranged on the surface of the rotor iron core 6 facing the stator 1; the permanent magnets 7 are magnetized in a direction perpendicular to the plane of the air gap, and the magnetization directions of adjacent permanent magnets 7 are alternately opposite.
Referring to fig. 1, k is 1, and the motor is a single-side structure motor, and the number of stators 1 is 1; in fig. 2, k is 2, and the number of stators 1 is 2. Counting from left to right, the 1 st stator module and the 2 nd stator module form an A phase module, the 3 rd stator module and the 4 th stator module form a B phase module, the 5 th stator module and the 6 th stator module form a C phase module, and different phase modules are not magnetically coupled.
The working principle of the present invention is explained in conjunction with fig. 3. When the winding of a certain phase of the stator 1 is electrified, the magnetic force line 8 forms a closed loop through the two armature teeth 3-2, the air gap, the rotor iron core 6 and the permanent magnet 7 in the two stator modules of the phase, and does not form a closed loop through the stator modules of other phases. Therefore, there is no magnetic coupling between the different phases of the highly modular flat multiphase permanent magnet linear motor. Similarly, when a phase winding of the motor has a short-circuit fault, the magnetic lines of force generated by the short-circuit phase winding are also closed through the path and form a closed loop without passing through the windings of other phases, so that the influence of the short circuit on other normal phases is eliminated, and good magnetic isolation is realized. In addition, due to the existence of the two fault-tolerant teeth 3-1, the winding heating caused by the winding short circuit is effectively controlled in the stator module with the short circuit, and other normal stator modules are further protected favorably.
The second embodiment is as follows: in the first embodiment, m is equal to or greater than 3, and the annular concentrated winding 5 is a three-phase or more concentrated winding.
By adopting the multiphase winding, the fault-tolerant operation performance of the highly-modularized flat plate type multiphase permanent magnet linear motor can be improved.
The third concrete implementation mode: in the first embodiment, the stator core 3 is made of a silicon steel sheet, an amorphous ferromagnetic composite material, or an SMC soft magnetic composite material.
The rotor iron core 6 is made of solid steel, silicon steel sheets, amorphous ferromagnetic composite materials or SMC soft magnetic composite materials.
The fourth concrete implementation mode: the present embodiment will be described with reference to fig. 4 and 5, and the present embodiment will further describe the first embodiment in which the number of poles of the permanent magnet mover 2 is selected in accordance with the number of harmonics of the magnetomotive force in the air gap. When the permanent magnet mover 2 moves relative to the stator 1, the permanent magnets 7 located between the two ends of the stator 1 are active, and the permanent magnets 7 located outside the ends of the stator 1 are inactive, so the number of poles of the permanent magnet mover 2 corresponds to the number of the permanent magnets 7 located between the two ends of the stator 1 in the present embodiment.
The permanent magnet rotor 2 adopts a surface-mounted structure, a Halbach structure or an axial magnetizing structure.
The structure of the Halbach type rotor is shown in figure 4, the Halbach type rotor consists of a plurality of Halbach permanent magnets 9 with different magnetizing directions and a rotor support 10, and the Halbach permanent magnets 9 are placed on the surface of one side of the rotor support 10; as shown in fig. 5, the axial magnetizing type rotor is composed of a rotor support 10, magnetic blocks 11, and axial magnetizing permanent magnets 12, wherein the magnetic blocks 11 and the axial magnetizing permanent magnets 12 are axially and alternately arranged and placed on one side surface of the rotor support 10, and the magnetizing directions of the adjacent axial magnetizing permanent magnets 12 are alternately opposite; the mover holder 10 is made of a non-magnetic conductive material such as titanium alloy, aluminum alloy, or the like.
Claims (6)
1. the flat plate type multiphase permanent magnet linear motor is characterized by comprising k stators (1) and permanent magnet rotors (2), wherein when k is 1 or 2, and k is 1, the stators (1) are arranged on one sides of the permanent magnet rotors (2); when k is 2, the two stators (1) are symmetrically arranged at two sides of the permanent magnet rotor (2);
An air gap with the length of L is reserved between the stator (1) and the permanent magnet rotor (2);
The stator (1) is formed by splicing 2m stator modules, wherein m is the phase number of the motor, and the 2m stator modules are spliced into the stator (1) with a flat plate-shaped structure along the axial direction; each stator module comprises a stator core (3) and a concentrated winding (5); two fault-tolerant teeth (3-1) and an armature tooth (3-2) are arranged on a stator iron core (3), the armature tooth (3-2) is positioned between the two fault-tolerant teeth (3-1), and the length of the armature tooth (3-2) along the axial direction is greater than that of the fault-tolerant teeth (3-1) along the axial direction; the teeth jointly enclose two stator slots (4), and the stator slots (4) are arranged facing the permanent magnet rotor (2); the stator iron core (3) and the stator slot (4) are both flat plates, and the concentrated winding (5) is embedded in the stator slot (4) and wound on the armature teeth (3-2);
From left to right, every two adjacent stator modules form a phase module of the motor, and concentrated windings (5) of the two stator modules in the same phase module have the same number of turns and opposite winding directions;
the permanent magnet rotor (2) comprises a rotor iron core (6) and a permanent magnet (7), the rotor iron core (6) and the permanent magnet (7) are both in a flat plate shape, and the permanent magnet (7) is arranged on the surface of the rotor iron core (6) facing the stator (1); the permanent magnets (7) are magnetized in a direction perpendicular to the plane of the air gap, and the magnetization directions of adjacent permanent magnets (7) are alternately opposite.
2. The flat plate type multiphase permanent magnet linear motor with high modularization according to claim 1, wherein m is larger than or equal to 3, and the annular concentrated winding (5) is a three-phase concentrated winding or a concentrated winding with more than three phases.
3. highly modular flat multiphase permanent magnet linear motor according to claim 1, characterized in that the stator core (3) is made of silicon steel sheets, amorphous ferromagnetic composite or SMC soft magnetic composite.
4. highly modular flat multiphase permanent magnet linear motor according to claim 1, characterized in that the mover core (6) is made of solid steel, silicon steel sheets, amorphous ferromagnetic composite material or SMC soft magnetic composite material.
5. highly modular flat multiphase permanent magnet linear motor according to claim 1, characterized in that the number of poles of the permanent magnet mover (2) is selected according to the harmonic number of the magnetomotive force in the air gap.
6. The flat multiphase permanent magnet linear motor with high modularity according to claim 1, wherein the permanent magnet mover (2) is of a surface-mounted structure, a Halbach structure or an axial magnetizing structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510212416.4A CN104767351B (en) | 2015-04-29 | 2015-04-29 | Highly modularized flat plate type multiphase permanent magnet linear motor |
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| CN201510212416.4A CN104767351B (en) | 2015-04-29 | 2015-04-29 | Highly modularized flat plate type multiphase permanent magnet linear motor |
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| CN104767351A CN104767351A (en) | 2015-07-08 |
| CN104767351B true CN104767351B (en) | 2019-12-10 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108390537B (en) * | 2018-03-21 | 2019-12-31 | 哈尔滨工业大学 | Non-overlapping winding double-side AC linear motor |
| CN108616207A (en) * | 2018-05-09 | 2018-10-02 | 同济大学 | A kind of long-stator linear motor winding for rail traffic |
| CN108599520A (en) * | 2018-06-22 | 2018-09-28 | 博众精工科技股份有限公司 | More mover moving-magnetic type Discrete control linear induction motor systems |
| CN109004805B (en) * | 2018-08-03 | 2020-04-14 | 北京理工大学 | Double-acting sub-modular permanent magnet linear motor capable of running at differential speed |
| CN114362472B (en) * | 2021-12-28 | 2023-04-25 | 中国人民解放军海军工程大学 | Segmented spliced modular linear motor with intersegmental magnetic field compensation windings and splicing compensation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102006032989A1 (en) * | 2006-07-17 | 2008-01-31 | Siemens Ag | Electric linear drive |
| CN100592609C (en) * | 2006-09-28 | 2010-02-24 | 哈尔滨工业大学 | Horizontal flux flat-plate type permanent-magnetic linear electric machine |
| CN101707404B (en) * | 2009-11-30 | 2012-03-28 | 哈尔滨工业大学 | Halbach array disk rotor of permanent magnet motor with composite structure |
| CN101814819B (en) * | 2010-05-11 | 2012-06-13 | 南通大学 | Independent sinusoidal driving permanent magnet synchronous fault-tolerant linear motor |
| CN101860174B (en) * | 2010-05-12 | 2012-11-28 | 东南大学 | Complementary type modularization permanent-magnetism linear motor and motor die set formed by same |
| CN102013786B (en) * | 2010-12-13 | 2012-09-19 | 东南大学 | Modular complementary type primary permanent magnet linear motor and motor module formed thereby |
| CN102938603B (en) * | 2012-11-26 | 2015-04-22 | 江苏大学 | Cylindrical permanent-magnet linear motor with modular C-shaped stator cores |
| CN104052234B (en) * | 2014-06-10 | 2016-04-27 | 江苏大学 | A kind of electromagnetic vehicle suspension drives by the fault-tolerant permanent-magnet linear actuator of five phase cylinder types |
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