CA2737357C - Ac permanent magnet synchronous electrical machine - Google Patents
Ac permanent magnet synchronous electrical machine Download PDFInfo
- Publication number
- CA2737357C CA2737357C CA2737357A CA2737357A CA2737357C CA 2737357 C CA2737357 C CA 2737357C CA 2737357 A CA2737357 A CA 2737357A CA 2737357 A CA2737357 A CA 2737357A CA 2737357 C CA2737357 C CA 2737357C
- Authority
- CA
- Canada
- Prior art keywords
- theta
- air gap
- electrical machine
- rotor
- stator
- 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
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000014509 gene expression Effects 0.000 claims description 4
- 238000004080 punching Methods 0.000 description 9
- 238000004804 winding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 210000004013 groin Anatomy 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
-
- 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
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
An AC permanent magnet synchronous electrical machine includes a stator (1) and a rotor (2). An air gap (7) is provided between the outer circumference of the rotor (2) and the inner wall of the stator (1). The minimum air gap length of the air gap (7) is g min, and a mechanical rotating angle of a position with the minimum air gap length is zero degree. The number of the pole pairs of the electrical machine is p. an air gap length of a position with an electrical degree of p.cndot..theta. is g(p.cndot..theta.).
g(p.cndot..theta.) of a position within a certain electrical degree range is inversely proportional to a cosine function of the electrical degree.
g(p.cndot..theta.) of a position within a certain electrical degree range is inversely proportional to a cosine function of the electrical degree.
Description
AC PERMANENT MAGNET SYNCHRONOUS ELECTRICAL
MACHINE
TECHNICAL FIELD
The invention relates to an AC permanent magnet synchronous electrical machine, belonging to the technical field of motor manufacturing.
BACKGROUND ART
With the development of control technology, the application of AC permanent magnet synchronous electrical machines , especially servo motors , is becoming more extensive in recent years. It is hoped that induced potential generated by permanent magnet excitation is sinusoidal potential to obtain better operation performance, so in a common uniform-air-gap motor, special winding connection or skewed slot is usually adopted to weaken harmonic wave, but it is hard to get perfect.
SUMMARY OF THE INVENTION
In view of the defects of the prior art, the object of the invention is to provide an AC permanent magnet synchronous electrical machine which can obtain sine potential in mechanics without considering winding connection to weaken harmonic wave and has better operation performance.
The above technical object of the invention is mainly achieved through the following technical solution:
The AC permanent magnet synchronous electrical machine comprises a stator and a rotor disposed in the stator; an air gap is formed between the circumference of the rotor and the inner wall of the stator, the length of the minimum air gap at the central line of a magnetic pole is defined as gmin; if the mechanical pole arc angle leaving the point is 0 , and the number of pole-pairs of the electrical machine is p, then the electric degree of the polar arc angle is the product p0 of the polar arc angle 0 and the number of pole-pairs p, the length of the air gap corresponding to the electric angle p0 is defined as g(p0 ), and g(p0 ) is determined according to the following expressions:
when 0:5 pB<_73 , g(PO) = cos(p8) (1 ) when 73 S pe <_ 107 g(p6) = gmin l cos 73 ( 2 ) when 107 <_ pe 180 g(PO) = Icos(pO)j (3 ) when Pe >_ 180 , the length g(p0 ) of the air gap varies periodically, that is g(pO + k x 180 ) = g(pO) (4) wherein k is any integer.
In the expressions, the value of the number of pole-pairs of the electrical machine is one-half of the number of rotor poles.
The radial length of the air gap between the stator and the rotor of the invention is inversely proportional to a cosine function of the electrical degree of the polar arc angle within a certain polar arc degree range, and when an iron core is unsaturated, the magnetic flux density of the air gap changes similarly to cosine, so that the variation of no-loading electric potential is similar to sine without specially considering winding connection to weaken harmonic wave, and thus the electrical machine obtains better operation performance.
Preferably, said rotor comprises a rotor iron core and permanent magnets evenly embedded in the rotor iron core, and the cross section of said permanent magnets is rectangular.
Therefore, the invention can obtain sinusoidal potential in mechanics without considering winding connection to weaken harmonic wave and has better operation performance.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic diagram of a finally assembled structure of the invention;
Figure 2 is a structural diagram of a stator punching of the invention;
Figure 3 is a structural diagram of a rotor punching of the invention; and Figure 4 is a structural diagram of the size of an air gap of the invention.
DETAILED DESCRIPTION OF THE EMBODIMENT
The technical solution of the invention is further described by combing the following embodiment and the drawings.
Embodiment 1: referring to figure 1, a stator 1 comprising a stator iron core and a coil winding is internally provided with a homocentric rotor 2, an air gap 7 is formed between the circumference of the rotor 2 and the inner wall of the stator 1, a stator punching 3 of the stator iron core is shown as figure 2, the stator punching 3 is similar to a stator iron core punching of a common AC motor and is made by punching a silicon steel sheet, a concentric round ring is formed by two concentric circles, and grooves 4 which are distributed evenly are used for embedding coils; figure 3 shows a rotor punching, the rotor punching 5 is provided with four embedding grooves 6 which are evenly distributed for embedding permanent magnets, the cross section of the permanent magnets is rectangular, the circumference of the rotor punching 5 is formed by different curve segments, figure 3 shows the situation of four-poles rotor, then the number of pole-pairs of the electrical machine is two, the circumference of the rotor is divided into 8 parts, four parts and stator arc form air gaps, and the lengths of the air gaps at different points are determined according to figure 4.
The length of the minimum air gap at the central line of a magnetic pole is defined as groin, the mechanical pole arc angle leaving the point is 6 , and the number of pole-pairs of the electrical machine is 2, then the electric degree of the polar arc angle is the product 26 of the polar arc angle 6 and the number of pole-pairs p, the length of the air gap corresponding to the electric degree p6 is defined as g(p 6 ), and g(p 0 ) is determined according to the following expressions:
when 0<_ p0 < 73 , namely 0:5 0<_ 36.5 g(pe) = COS(PO) (1 ) when 73 ` PB <_ 107 namely 36.5 <_ B <_ 53.5 g(pO) = groin cos 73 ( 2 ) lO7<Pe <180 when , namely 53.5 <_ 0<_ 90 g(Pe) = groin Icos(Pe)I ( 3 ) when pe >_ 180 , namely 0 >_ 90 , the length g(p6) of the air gap varies periodically, that is g(pe+kxl8o )=g(Pe) ( 4 ) wherein k is any integer.
MACHINE
TECHNICAL FIELD
The invention relates to an AC permanent magnet synchronous electrical machine, belonging to the technical field of motor manufacturing.
BACKGROUND ART
With the development of control technology, the application of AC permanent magnet synchronous electrical machines , especially servo motors , is becoming more extensive in recent years. It is hoped that induced potential generated by permanent magnet excitation is sinusoidal potential to obtain better operation performance, so in a common uniform-air-gap motor, special winding connection or skewed slot is usually adopted to weaken harmonic wave, but it is hard to get perfect.
SUMMARY OF THE INVENTION
In view of the defects of the prior art, the object of the invention is to provide an AC permanent magnet synchronous electrical machine which can obtain sine potential in mechanics without considering winding connection to weaken harmonic wave and has better operation performance.
The above technical object of the invention is mainly achieved through the following technical solution:
The AC permanent magnet synchronous electrical machine comprises a stator and a rotor disposed in the stator; an air gap is formed between the circumference of the rotor and the inner wall of the stator, the length of the minimum air gap at the central line of a magnetic pole is defined as gmin; if the mechanical pole arc angle leaving the point is 0 , and the number of pole-pairs of the electrical machine is p, then the electric degree of the polar arc angle is the product p0 of the polar arc angle 0 and the number of pole-pairs p, the length of the air gap corresponding to the electric angle p0 is defined as g(p0 ), and g(p0 ) is determined according to the following expressions:
when 0:5 pB<_73 , g(PO) = cos(p8) (1 ) when 73 S pe <_ 107 g(p6) = gmin l cos 73 ( 2 ) when 107 <_ pe 180 g(PO) = Icos(pO)j (3 ) when Pe >_ 180 , the length g(p0 ) of the air gap varies periodically, that is g(pO + k x 180 ) = g(pO) (4) wherein k is any integer.
In the expressions, the value of the number of pole-pairs of the electrical machine is one-half of the number of rotor poles.
The radial length of the air gap between the stator and the rotor of the invention is inversely proportional to a cosine function of the electrical degree of the polar arc angle within a certain polar arc degree range, and when an iron core is unsaturated, the magnetic flux density of the air gap changes similarly to cosine, so that the variation of no-loading electric potential is similar to sine without specially considering winding connection to weaken harmonic wave, and thus the electrical machine obtains better operation performance.
Preferably, said rotor comprises a rotor iron core and permanent magnets evenly embedded in the rotor iron core, and the cross section of said permanent magnets is rectangular.
Therefore, the invention can obtain sinusoidal potential in mechanics without considering winding connection to weaken harmonic wave and has better operation performance.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic diagram of a finally assembled structure of the invention;
Figure 2 is a structural diagram of a stator punching of the invention;
Figure 3 is a structural diagram of a rotor punching of the invention; and Figure 4 is a structural diagram of the size of an air gap of the invention.
DETAILED DESCRIPTION OF THE EMBODIMENT
The technical solution of the invention is further described by combing the following embodiment and the drawings.
Embodiment 1: referring to figure 1, a stator 1 comprising a stator iron core and a coil winding is internally provided with a homocentric rotor 2, an air gap 7 is formed between the circumference of the rotor 2 and the inner wall of the stator 1, a stator punching 3 of the stator iron core is shown as figure 2, the stator punching 3 is similar to a stator iron core punching of a common AC motor and is made by punching a silicon steel sheet, a concentric round ring is formed by two concentric circles, and grooves 4 which are distributed evenly are used for embedding coils; figure 3 shows a rotor punching, the rotor punching 5 is provided with four embedding grooves 6 which are evenly distributed for embedding permanent magnets, the cross section of the permanent magnets is rectangular, the circumference of the rotor punching 5 is formed by different curve segments, figure 3 shows the situation of four-poles rotor, then the number of pole-pairs of the electrical machine is two, the circumference of the rotor is divided into 8 parts, four parts and stator arc form air gaps, and the lengths of the air gaps at different points are determined according to figure 4.
The length of the minimum air gap at the central line of a magnetic pole is defined as groin, the mechanical pole arc angle leaving the point is 6 , and the number of pole-pairs of the electrical machine is 2, then the electric degree of the polar arc angle is the product 26 of the polar arc angle 6 and the number of pole-pairs p, the length of the air gap corresponding to the electric degree p6 is defined as g(p 6 ), and g(p 0 ) is determined according to the following expressions:
when 0<_ p0 < 73 , namely 0:5 0<_ 36.5 g(pe) = COS(PO) (1 ) when 73 ` PB <_ 107 namely 36.5 <_ B <_ 53.5 g(pO) = groin cos 73 ( 2 ) lO7<Pe <180 when , namely 53.5 <_ 0<_ 90 g(Pe) = groin Icos(Pe)I ( 3 ) when pe >_ 180 , namely 0 >_ 90 , the length g(p6) of the air gap varies periodically, that is g(pe+kxl8o )=g(Pe) ( 4 ) wherein k is any integer.
Claims (2)
1. An AC permanent magnet synchronous electrical machine, comprising a stator and a rotor disposed in the stator, an air gap being formed between the circumference of the rotor and the inner wall of the stator, said AC permanent magnet synchronous electrical machine being characterized in that the length of the minimum air gap at the central line of a magnetic pole is defined as g min; if the mechanical pole arc angle leaving the point is .theta., and the number of pole-pairs of the electrical machine is p, then the electric degree of the polar arc angle is the product p.theta. of the polar arc angle .theta. and the number of pole-pairs p, the length of the air gap corresponding to the electric degree p.theta. is defined as g(p .theta.), and g(p.theta.) is determined according to the following expressions:
when 0<=p.theta.<=73°, when 73° <= p.theta. <= 107°
when 107° <= p.theta. <= 180°
when p.theta. >= 180° , the length g(p.theta.) of the air gap varies periodically, that is g(p.theta.+k x 180°)=g(p.theta.) ( 4 ) wherein k is any integer.
when 0<=p.theta.<=73°, when 73° <= p.theta. <= 107°
when 107° <= p.theta. <= 180°
when p.theta. >= 180° , the length g(p.theta.) of the air gap varies periodically, that is g(p.theta.+k x 180°)=g(p.theta.) ( 4 ) wherein k is any integer.
2. The AC permanent magnet synchronous electrical machine according to claim 1, characterized in that said rotor comprises a rotor iron core and permanent magnets evenly embedded in the rotor iron core, and the cross section of said permanent magnets is rectangular.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810163507.3 | 2008-12-29 | ||
| CN200810163507A CN101771316A (en) | 2008-12-29 | 2008-12-29 | AC permanent magnet synchronous motor |
| PCT/CN2009/070780 WO2010078734A1 (en) | 2008-12-29 | 2009-03-13 | Ac permanent magnet synchronous electrical machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2737357A1 CA2737357A1 (en) | 2010-07-15 |
| CA2737357C true CA2737357C (en) | 2013-10-08 |
Family
ID=42316214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2737357A Active CA2737357C (en) | 2008-12-29 | 2009-03-13 | Ac permanent magnet synchronous electrical machine |
Country Status (7)
| Country | Link |
|---|---|
| KR (1) | KR101241391B1 (en) |
| CN (1) | CN101771316A (en) |
| AU (1) | AU2009336998B2 (en) |
| CA (1) | CA2737357C (en) |
| MY (1) | MY152409A (en) |
| NZ (1) | NZ591686A (en) |
| WO (1) | WO2010078734A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI556549B (en) * | 2015-10-05 | 2016-11-01 | 建準電機工業股份有限公司 | Internal rotor motor, rotor thereof and method for determining dimensional proportion of the rotor |
| CN109245411A (en) * | 2018-10-29 | 2019-01-18 | 哈尔滨理工大学 | A kind of low permanent magnet synchronous motor made an uproar that shakes |
| FR3104848B1 (en) * | 2019-12-17 | 2021-11-26 | Ifp Energies Now | Synchro-reluctant machine with variable air gap |
| CN111725923B (en) * | 2020-07-27 | 2021-07-02 | 威灵（芜湖）电机制造有限公司 | Motor and household appliance |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2203806Y (en) * | 1994-12-08 | 1995-07-19 | 永济电机厂 | Direct-current electric machine |
| US6486581B2 (en) * | 2000-03-31 | 2002-11-26 | Sanyo Denki Co., Ltd. | Interior permanent magnet synchronous motor |
| JP3983004B2 (en) * | 2000-03-31 | 2007-09-26 | 山洋電気株式会社 | Synchronous motor with built-in permanent magnet |
| JP2008029078A (en) * | 2006-07-19 | 2008-02-07 | Fanuc Ltd | Permanent magnet type synchronous motor |
-
2008
- 2008-12-29 CN CN200810163507A patent/CN101771316A/en active Pending
-
2009
- 2009-03-13 MY MYPI20110933 patent/MY152409A/en unknown
- 2009-03-13 AU AU2009336998A patent/AU2009336998B2/en active Active
- 2009-03-13 NZ NZ591686A patent/NZ591686A/en unknown
- 2009-03-13 WO PCT/CN2009/070780 patent/WO2010078734A1/en active Application Filing
- 2009-03-13 KR KR1020117007006A patent/KR101241391B1/en active IP Right Grant
- 2009-03-13 CA CA2737357A patent/CA2737357C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| NZ591686A (en) | 2013-11-29 |
| AU2009336998B2 (en) | 2013-05-23 |
| CA2737357A1 (en) | 2010-07-15 |
| AU2009336998A1 (en) | 2010-07-15 |
| KR101241391B1 (en) | 2013-03-11 |
| CN101771316A (en) | 2010-07-07 |
| WO2010078734A1 (en) | 2010-07-15 |
| KR20110053371A (en) | 2011-05-20 |
| MY152409A (en) | 2014-09-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |