CN109474155B - Double-stator asynchronous starting vernier motor - Google Patents
Double-stator asynchronous starting vernier motor Download PDFInfo
- Publication number
- CN109474155B CN109474155B CN201811527344.2A CN201811527344A CN109474155B CN 109474155 B CN109474155 B CN 109474155B CN 201811527344 A CN201811527344 A CN 201811527344A CN 109474155 B CN109474155 B CN 109474155B
- Authority
- CN
- China
- Prior art keywords
- stator
- rotor
- winding
- outer stator
- double
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses a double-stator asynchronous starting vernier motor, which comprises an outer stator, an inner stator and a rotor, wherein the outer stator is connected with the inner stator through a connecting rod; the outer stator comprises an outer stator iron core and an outer stator winding, the inner stator comprises an inner stator iron core, and the rotor comprises a rotor iron core, a rotor damping winding, a rotor starting winding and a permanent magnet. The outer stator iron core is annular and is used for accommodating the outer stator winding; the rotor core is coaxially sleeved in the outer stator core, the top of the rotor slot is used for accommodating the rotor damping winding, and the bottom of the rotor slot is used for accommodating the rotor starting winding; the inner stator iron core is coaxially sleeved in the outer stator iron core, and the inner stator slots are spatially different by a mechanical angle of half slot pitch; a plurality of permanent magnets are disposed within the rotor core. The double-stator asynchronous starting vernier motor provided by the invention adopts two stators, and the rotors of the double-stator asynchronous starting vernier motor adopt two sets of rotor windings, so that the interruption of a magnetic circuit during starting and steady state of a permanent magnet can be avoided, the starting performance can be ensured, and the steady state performance can be considered.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a double-stator asynchronous starting vernier motor.
Background
The rare earth resources in China are rich, and meanwhile, the research level of rare earth materials and the research level of rare earth permanent magnet motors reach the international advanced level. Therefore, the advantages of rare earth resources are fully exerted, and the research and the popularization and the application of various permanent magnet motors represented by rare earth permanent magnet motors have important theoretical significance and practical value for China. Compared with the traditional asynchronous motor, the permanent magnet motor has simple structure and reliable operation; the volume is small and the weight is light; the loss is small, and the efficiency is high; the vernier motor has the advantage of high torque density which can be more than twice of that of the common permanent magnet motor. The asynchronous starting vernier motor can be directly started in an on-grid mode and has the same steady-state characteristics, such as the same torque density and efficiency and the like, as the converter drive control vernier permanent magnet motor. Compared with the common asynchronous starting permanent magnet synchronous motor, the torque density of the asynchronous starting vernier motor can be greatly improved. In the application occasions with large cardinality, high total energy consumption and low speed regulation requirement, such as a fan, a water pump and the like, the asynchronous starting vernier permanent magnet motor saves a converter, and saves materials, space and cost. Therefore, the popularization and application of the asynchronous starting vernier permanent magnet motor can save a large amount of resources and generate great social and economic benefits.
The asynchronous starting vernier motor has the relationship of competition space between a rotor slot and a permanent magnet, the permanent magnet adopts a Spoke type structure, the number of the permanent magnets can be effectively reduced, and the condition of competition space between the permanent magnet and the rotor slot is relieved. The placement mode of the Spoke type permanent magnet in the rotor can break the short-pole magnetic field magnetic circuit with a longer magnetic circuit, so that the steady-state performance is further reduced. The starting method is characterized in that the starting is performed by using a small-pole-changing starting method with reduced pole pair number, namely, the pole number of the outer stator winding is less than that of the permanent magnet by changing the pole of the outer stator winding in the starting process, so that the braking torque of the permanent magnet and the leakage reactance of the stator during starting are reduced. At the moment, the magnetic circuit is longer in the starting stage, and the permanent magnet has an interruption effect on the magnetic circuit, so that the starting capability is greatly reduced, and the capability of starting with a rated torque load cannot be achieved.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a double-stator asynchronous starting vernier motor, aiming at solving the problems of braking torque of permanent magnets and stator leakage reactance of the conventional Spoke type rotor.
In order to achieve the above object, the present invention provides a double-stator asynchronous starting vernier motor, which comprises an outer stator, an inner stator and a rotor, wherein the rotor is arranged between the outer stator and the inner stator; the outer stator comprises an outer stator iron core and an outer stator winding, the inner stator comprises an inner stator iron core, and the rotor comprises a rotor iron core, a rotor damping winding, a rotor starting winding and a permanent magnet.
The outer stator iron core is annular, and the inner annular surface of the outer stator iron core is provided with a plurality of open slots serving as outer stator slots along the circumferential direction and used for accommodating an outer stator winding; the rotor core is coaxially sleeved in the outer stator core, a plurality of rotor slots are formed in the outer surface of the rotor core, which is opposite to the surface of the inner ring of the outer stator core, along the circumferential direction, the tops of the rotor slots are used for accommodating rotor damping windings, and the bottoms of the rotor slots are used for accommodating rotor starting windings; the inner stator iron core is coaxially sleeved in the outer stator iron core, inner stator grooves with the same number as the outer stator grooves are formed in the circumferential direction of the outer surface of the inner ring surface of the outer stator iron core, and the mechanical angle is different by half of the groove distance in space; a plurality of permanent magnets are disposed within the rotor core. The invention improves the mechanism of the asynchronous starting vernier motor, adds an inner stator on the basis of the original Spoke type asynchronous starting vernier motor so as to provide a magnetic circuit with a few-pole magnetic field, relieves the interruption effect of a permanent magnet on the magnetic circuit in the starting stage and the steady stage, and greatly improves the steady state performance and the starting performance.
Preferably, the inner stator is a salient pole stator.
Preferably, the outer stator winding is a pole-changing single winding with a double-pole number, and the rotor winding is a wound-type double winding.
Preferably, the number of pole pairs of the rotor starting winding is the same as that of the outer stator winding when the stator is started, the number of pole pairs of the rotor damping winding is the same as that of the permanent magnet, and the inner stator is not provided with the winding.
Preferably, when the number of stator slots is greater than the number of pole pairs of the permanent magnets, the sum of the number of pole pairs of the outer stator winding and the number of pole pairs of the permanent magnets is the number of the stator slots; and when the number of the stator slots is less than the number of the pole pairs of the permanent magnets, the sum of the number of the pole pairs of the outer stator winding and the number of the stator slots is the number of the pole pairs of the permanent magnets.
Preferably, the number of pole pairs of the outer stator winding when starting is smaller than that when normally operating, and the number of pole pairs of the outer stator winding when normally operating is smaller than that of the permanent magnet.
Preferably, the permanent magnets are of the Spoke type.
Preferably, the number of the stator slots is multiple, and the stator slots are uniformly distributed along the circumferential direction of the inner ring surface of the stator core; the rotor slots are a plurality of and are uniformly distributed along the circumferential direction of the inner ring surface of the rotor core.
Through the switch setting, the number of pole pairs of the outer stator winding during starting is different from the number of pole pairs of the outer stator winding during steady state, the number of pole pairs of the rotor starting winding is the same as the number of pole pairs of the outer stator winding during starting, and the number of pole pairs of the rotor damping winding is the same as the number of pole pairs of the rotor permanent magnet. When the motor is started, the outer stator winding is changed in pole, the outer stator winding and the rotor winding with the same number of pole pairs act to generate asynchronous torque, the motor starts to accelerate from a standstill, the number of pole pairs of the outer stator winding is different from the number of pole pairs of the permanent magnets, and the permanent magnet braking torque is not generated in the starting stage. At the moment, the few-level magnetic field can pass through the inner stator so as to bypass the permanent magnet, thereby avoiding the interruption of the permanent magnet to a magnetic circuit and enhancing the starting capability. When the rotating speed is increased to be close to the synchronous speed of the vernier motor, the switch is switched, the pole pair number of the outer stator winding is changed into the pole pair number Pa in the stable state, the requirement that Pa is | N +/-Pe | is met, N is the number of the stator slots, the rotor operates at the synchronous speed, namely 60f/Pe, the pole pair number of the damping winding of the rotor is the same as the pole pair number of the permanent magnet, namely Pe, the damping winding plays a role, and the motor operates at the synchronous speed stably. At the moment, the multi-level magnetic field passes through the permanent magnet to be closed, and the few-level magnetic field passes through the inner stator, so that the interruption of the permanent magnet to a few-level magnetic circuit is avoided, and the steady-state performance can be effectively improved.
Generally, by the above technical solution conceived by the present invention, compared with the prior art, the following beneficial effects can be obtained:
1. according to the double-stator asynchronous starting vernier motor, the pole pair number of the outer stator winding and the pole pair number of the permanent magnet meet the pole slot matching of the vernier motor in a steady state, and compared with a common asynchronous starting permanent magnet motor, the torque density can be greatly improved;
2. the double-stator asynchronous starting vernier motor provided by the invention adopts two stators, so that the interruption of a magnetic circuit by a permanent magnet during starting and steady state can be avoided, the starting performance can be ensured, and the steady state performance can be considered;
3. the double-stator asynchronous starting vernier motor provided by the invention has asynchronous starting capability, can be directly connected with a network for operation, and saves the cost of a frequency converter of the vernier motor.
Drawings
Fig. 1 is a radial cross-sectional view of a double-stator asynchronous starting vernier motor provided in an embodiment of the present invention;
fig. 2 is a stator pole-changing circuit diagram of a double-stator asynchronous starting vernier motor provided by the embodiment of the invention;
description of the drawings:
1. stator core, 2, rotor core, 3, outer stator winding, 4, rotor permanent magnet, 5, rotor damping winding, 6, rotor starting winding, 7, inner stator core.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a double-stator asynchronous starting vernier motor, which comprises an outer stator, an inner stator and a rotor as shown in figure 1, wherein the rotor is arranged between the outer stator and the inner stator; the outer stator comprises an outer stator iron core 1 and an outer stator winding 3, the inner stator comprises an inner stator iron core, and the rotor comprises a rotor iron core 2, a rotor damping winding 5, a rotor starting winding 6 and a permanent magnet 4.
The outer stator core 1 is annular, and the inner annular surface of the outer stator core is provided with a plurality of open slots serving as stator slots along the circumferential direction and used for accommodating the outer stator winding 3; the rotor core 2 is coaxially sleeved in the stator core 1, a plurality of rotor slots are formed in the outer surface of the stator core 1 opposite to the inner ring surface along the circumferential direction, the tops of the rotor slots are used for accommodating rotor damping windings 5, and the bottoms of the rotor slots are used for accommodating rotor starting windings 6; the inner stator iron core 7 is coaxially sleeved in the outer stator iron core 1, inner stator slots with the same number as that of the outer stator slots are formed in the circumferential direction of the outer surface of the inner ring surface of the outer stator iron core 1, and the mechanical angle is different by half of the slot pitch in space; a plurality of permanent magnets 4 are disposed within rotor core 2.
The outer stator winding 3 is a pole-changing single winding with double pole number, and the rotor damping winding 5 and the rotor starting winding 6 are winding type double windings.
Specifically, the number of pole pairs of the rotor starting winding is the same as that of the outer stator winding when the stator is started, and the number of pole pairs of the rotor damping winding is the same as that of the permanent magnet.
Specifically, when the number of stator slots is greater than the number of pole pairs of the permanent magnets, the sum of the number of pole pairs of the outer stator winding and the number of pole pairs of the permanent magnets is the number of the stator slots; and when the number of the stator slots is less than the number of the pole pairs of the permanent magnets, the sum of the number of the pole pairs of the outer stator winding and the number of the stator slots is the number of the pole pairs of the permanent magnets.
Specifically, the number of pole pairs when the outer stator winding is started is smaller than that when the outer stator winding is in normal operation, and the number of pole pairs when the outer stator winding is in normal operation is smaller than that of the permanent magnet.
In particular, the permanent magnet is of the Spoke type.
Specifically, a plurality of outer stator slots are uniformly distributed along the circumferential direction of an inner ring surface of the stator core; the rotor slots are a plurality of and are uniformly distributed along the circumferential direction of the inner ring surface of the rotor core.
In order to ensure that positive starting torque can be always provided in the whole starting interval, the number of pole pairs of the outer stator winding is different from that of the pole pairs in a steady state when starting, the number of pole pairs in the starting process is smaller than that of the pole pairs Pe of the permanent magnets, in the asynchronous starting vernier motor in the embodiment, the number N of stator slots is selected to be 6, the number Pe of the pole pairs of the permanent magnets is 5, then the number Pa of the pole pairs of the outer stator winding in the steady state is 1, the number of the pole pairs of the stator in the starting process is 2, the number of the pole pairs of the starting winding of the rotor is 2, the number of the pole pairs of the damping winding. When the synchronous speed is increased to be close to the steady-state synchronous speed, S1 is disconnected, S2 is closed, the pole pair number of the outer stator winding is 1, Pa is | N +/-Pe |, the synchronous speed is 60f/Pe at the steady state, the pole pair number of the rotor damping winding is Pe, and the rotating speed is stabilized at the synchronous speed.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A double-stator asynchronous starting vernier motor is characterized by comprising an outer stator, an inner stator and a rotor, wherein the rotor is arranged between the outer stator and the inner stator; the outer stator comprises an outer stator iron core (1) and an outer stator winding (3), the inner stator comprises an inner stator iron core (7), and the rotor comprises a rotor iron core (2), a rotor damping winding (5), a rotor starting winding (6) and a permanent magnet (4);
the outer stator core (1) is annular, and the inner ring surface of the outer stator core is provided with a plurality of open slots serving as outer stator slots along the circumferential direction and used for accommodating an outer stator winding (3); the rotor core (2) is coaxially sleeved in the stator core (1), a plurality of rotor slots are formed in the outer surface of the rotor core (1) opposite to the inner ring surface along the circumferential direction, the tops of the rotor slots are used for accommodating the rotor damping winding (5), and the bottoms of the rotor slots are used for accommodating the rotor starting winding (6); the inner stator core (7) is coaxially sleeved in the outer stator core (1), inner stator grooves with the number equal to that of the outer stator grooves are formed in the circumferential direction of the outer surface of the inner ring surface of the outer stator core (1), and the inner stator grooves and the outer stator grooves are different in mechanical angle of half groove distance in space; the plurality of permanent magnets (4) are arranged in the rotor core (2).
2. Double stator asynchronous starting vernier motor according to claim 1, characterized in that the outer stator winding (3) is a pole-changing single winding of double pole number; the rotor damping winding (5) and the rotor starting winding (6) are wound double windings.
3. A double stator asynchronous starting vernier motor according to claim 1, characterized in that the number of pole pairs of the rotor starting winding (6) is the same as the number of pole pairs of the outer stator winding (3) at stator start, and the number of pole pairs of the rotor damping winding (5) is the same as the number of pole pairs of the permanent magnets (4).
4. A double stator asynchronous starting vernier motor as claimed in claim 1, wherein there is no winding in the inner stator.
5. A double stator asynchronous starting vernier motor according to claim 1, characterized in that the sum of the number of pole pairs of the outer stator winding (3) and the number of pole pairs of the permanent magnets (4) is the number of stator slots when the number of stator slots is larger than the number of pole pairs of the permanent magnets (4); and when the number of the stator slots is less than the number of the pole pairs of the permanent magnets (4), the sum of the number of the pole pairs of the outer stator winding (3) and the number of the stator slots is the number of the pole pairs of the permanent magnets (4).
6. A double stator asynchronous starting vernier motor according to any of claims 1 to 3, characterized in that the number of pole pairs when the outer stator winding (3) is started is smaller than the number of pole pairs in normal operation, and the number of pole pairs when the outer stator winding (3) is normal is smaller than the number of pole pairs of permanent magnets.
7. Double stator asynchronous starting vernier motor according to claim 1, characterized in that the permanent magnets (4) are of the Spoke type.
8. The double-stator asynchronous starting vernier motor as claimed in claim 1, wherein the number of the outer stator slots is a plurality of slots which are uniformly distributed along the circumferential direction of the inner annular surface of the stator core.
9. The double-stator asynchronous starting vernier motor as claimed in claim 1, wherein the number of the rotor slots is a plurality and is uniformly distributed along the circumferential direction of the inner annular surface of the rotor core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811527344.2A CN109474155B (en) | 2018-12-13 | 2018-12-13 | Double-stator asynchronous starting vernier motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811527344.2A CN109474155B (en) | 2018-12-13 | 2018-12-13 | Double-stator asynchronous starting vernier motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109474155A CN109474155A (en) | 2019-03-15 |
| CN109474155B true CN109474155B (en) | 2020-02-14 |
Family
ID=65674919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811527344.2A Active CN109474155B (en) | 2018-12-13 | 2018-12-13 | Double-stator asynchronous starting vernier motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109474155B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2769423B1 (en) * | 1997-10-07 | 1999-12-24 | Valeo Equip Electr Moteur | ELECTRIC MACHINE WITH DOUBLE EXCITATION, AND PARTICULARLY A MOTOR VEHICLE ALTERNATOR |
| EP1560318A4 (en) * | 2002-10-04 | 2006-04-12 | Mitsuba Corp | Starting power generation system and starting power generator |
| US6965183B2 (en) * | 2003-05-27 | 2005-11-15 | Pratt & Whitney Canada Corp. | Architecture for electric machine |
| CN102377300A (en) * | 2010-08-17 | 2012-03-14 | 杨中兴 | Double-stator single-rotor rare earth permanent magnet motor |
| CN104113173A (en) * | 2014-07-11 | 2014-10-22 | 华中科技大学 | Double-stator single-winding vernier permanent magnet motor |
| CN106059237B (en) * | 2016-06-12 | 2019-01-11 | 华中科技大学 | One kind can the self-running vernier magneto of pole-changing |
| JP2018099006A (en) * | 2016-12-09 | 2018-06-21 | 稔雄 中根 | Internal combustion machine activation and power generator |
-
2018
- 2018-12-13 CN CN201811527344.2A patent/CN109474155B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109474155A (en) | 2019-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105656271B (en) | A kind of pole-changing windingses method of transition asynchronous starting permanent magnet synchronous motor | |
| CN110635595B (en) | Outer rotor flywheel pulse synchronous generator system | |
| CN101651395A (en) | Sine wave current self-starting three-phase rare earth permanent-magnetism synchronous motor | |
| CN106059237B (en) | One kind can the self-running vernier magneto of pole-changing | |
| CN203261208U (en) | Multiple winding variable power induction motor | |
| CN104184291B (en) | Two half 4 pole asynchronous starting permanent magnet synchronous motors and pole-changing windings method | |
| CN108173403B (en) | Pole-changing speed-expanding permanent magnet synchronous motor | |
| CN108306473B (en) | Method for setting windings of asynchronous starting permanent magnet synchronous motor | |
| CN109861485B (en) | Surface-mounted asynchronous starting vernier motor | |
| CN109474155B (en) | Double-stator asynchronous starting vernier motor | |
| CN109672279B (en) | Rotor duplex winding pole-changing asynchronous starting vernier motor | |
| CN108233652B (en) | Double-stator asynchronous starting permanent magnet synchronous motor | |
| CN109194077B (en) | Pole-changing speed-regulating permanent magnet motor | |
| CN201478968U (en) | Sine current self-starting three-phase rare-earth permanent-magnet synchronous motor | |
| CN109672280B (en) | Asynchronous starting vernier motor | |
| CN201156694Y (en) | Asynchronously starting permanent magnet synchronous motor having special slot rotor | |
| CN104184293A (en) | Adjusting-type pole-changing speed-changing permanent-magnet synchronous motor | |
| CN110932442B (en) | Wound-rotor type asynchronous starting permanent magnet synchronous motor stator and rotor structure | |
| CN209250356U (en) | A kind of rotor punching that can reduce torque ripple of permanent-magnet motor | |
| CN109931221B (en) | Double-speed permanent magnet wind power generation system | |
| CN204126910U (en) | The synchronous Submerged Motor Pumps of a kind of efficient permanent magnet | |
| CN112821736A (en) | Method, system and medium for suppressing harmonic waves of machine side converter of disc type counter-rotating permanent magnet hydroelectric generator | |
| CN201656724U (en) | Switched reluctance motor | |
| CN101719709B (en) | Switched reluctance motor for capacitance split circuit | |
| CN201252431Y (en) | Magneto-modulated brushless internal-feedback motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |