CN103607061A - Permanent magnet motor rotor with direct-axis inductance larger than quadrature-axis inductance - Google Patents
Permanent magnet motor rotor with direct-axis inductance larger than quadrature-axis inductance Download PDFInfo
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- CN103607061A CN103607061A CN201310643552.XA CN201310643552A CN103607061A CN 103607061 A CN103607061 A CN 103607061A CN 201310643552 A CN201310643552 A CN 201310643552A CN 103607061 A CN103607061 A CN 103607061A
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- permanent magnet
- axis
- axis inductance
- rotor
- quadrature
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Abstract
The invention discloses a permanent magnet motor rotor with direct-axis inductance larger than quadrature-axis inductance. The permanent magnet motor rotor comprises a rotor core formed by rotor sheets, permanent magnets and magnetic flow barriers, wherein the permanent magnets are arranged in the rotor core and are evenly distributed along the circumference of the rotor core, the magnetic flow barriers are arranged on quadrature-axis magnetic circuits between adjacent permanent magnets, the magnetic flow barriers are in one or more combined shapes of round holes, rectangles, arcs, sectors and triangles, and the permanent magnets are in the shape of U, or V, or W, or a long strip, or a rectangle and the like. Due to the fact that the magnetic flow barriers are arranged on the quadrature-axis magnetic circuits between the poles of the permanent magnets in the rotor and the poles of the permanent magnets are different in shape, the ability of generating torque of a permanent magnet motor is maintained, the demagnetizing effect of direct-axis currents on the permanent magnets in the operation process of the permanent magnet motor is lowered, thinner permanent magnets can be adopted, and cost of the permanent magnet motor is lowered.
Description
Technical field
The present invention relates to the permanent magnet machine rotor that a kind of d-axis inductance is greater than quadrature axis inductance.
Background technology
Magneto has that volume is little, quality is light and the advantage such as energy-efficient.The permanent magnet machine rotor that permanent magnet is embedded in internal rotor can better utilize the torque of permanent magnet generation and the reluctance torque that cross, straight axle magnetic resistance imbalance produces, and makes motor have better torque and produces ability.
Formula below (1) is the electromagnetic torque equation of interior permanent magnet machines:
T in formula
em---the electromagnetic torque of motor;
D---subscript d represents direct axis component;
Q---subscript q represents direct axis component;
U
d, u
q---the d of stator voltage, q axle component;
I
d, i
q---the d of stator current, q axle component;
ψ
d, ψ
q---the d of stator magnetic linkage, q axle component;
L
d, L
q---the d of motor, q axle synchronous inductance;
ψ
f---the unloaded permanent magnetism magnetic linkage of motor in d-q coordinate system,
Ψ
f=E
0/ ω, E
0for the empty load of motor back electromotive force phase effective value in three-phase system, the electric angle speed that ω is magneto;
P---motor number of pole-pairs is generally the integers such as 1,2,3.
ω---electric angle speed.
P[ψ in interior permanent magnet machines formula (1)
fi
q+ (L
d-L
q) i
di
q] part, p(ψ
fi
q) be the basic electromagnetic torque that permanent magnetic field and armature reacting field interact and produce, be again permanent-magnet torque; p(L
d-L
q) i
di
qit is the asymmetric and reluctance torque that produces of d, q axle magnetic circuit by motor.
Reluctance torque p (L
d-L
q) i
di
qin, p is the integers such as 1,2,3; The d-axis synchronous inductance L of permagnetic synchronous motor
dbe generally less than quadrature axis synchronous inductance L
qso, (L
d-L
q) < 0; Quadrature axis current i
qto be greater than 0.If realize reluctance torque p (L
d-L
q) i
di
qbe greater than 0, direct-axis current i
dmust be less than 0.While especially needing motor output speed to be greater than the rated speed (the weak magnetic control system of magneto) of design of electrical motor, need to strengthen the weak magnetic current i of d-axis
dallow motor reach desirable speed.Direct-axis current i during weak magnetic
dlikely cause permanent magnet loss of excitation, understand like this performance of restrictions motor.In order to prevent that the loss of excitation of permanent magnet from just needing to adopt thicker permanent magnet, thereby cause the increase of whole motor cost.
Summary of the invention
The object of invention is exactly in order to address the above problem, provide a kind of d-axis inductance to be greater than the permanent magnet machine rotor of quadrature axis inductance, this rotor effectively weakens the degaussing impact of direct-axis current on permanent magnet, can guarantee that the torque of motor produces ability, has advantages of that again permanent magnet consumption is few.
To achieve these goals, the present invention adopts following technical scheme:
D-axis inductance is greater than a permanent magnet machine rotor for quadrature axis inductance, comprises the rotor core, permanent magnet and the flux-obstruction that rotor punching, consist of; Wherein, permanent magnet is arranged at rotor core inside, along rotor core even circumferential, distributes, and on the quadrature axis magnetic circuit between adjacent permanent magnet, flux-obstruction is set.
The shape of described flux-obstruction includes but not limited to circular hole, rectangle, arc, fan-shaped, leg-of-mutton one or more combination.
The shape of described permanent magnet includes but not limited to " U ", " V ", " W ", " one " word, rectangular shape.
Operation principle of the present invention is:
The electromagnetic torque equation of interior permanent magnet machines:
T in formula
em---the electromagnetic torque of motor;
D---subscript d represents direct axis component;
Q---subscript q represents direct axis component;
U
d, u
q---the d of stator voltage, q axle component;
I
d, i
q---the d of stator current, q axle component;
ψ
d, ψ
q---the d of stator magnetic linkage, q axle component;
L
d, L
q---the d of motor, q axle synchronous inductance;
ψ
f---the unloaded permanent magnetism magnetic linkage of motor in d-q coordinate system,
Ψ
f=E
0/ ω, E
0for the empty load of motor back electromotive force phase effective value in three-phase system, the electric angle speed that ω is magneto;
P---motor number of pole-pairs is generally the integers such as 1,2,3.
ω---electric angle speed.
P[ψ in interior permanent magnet machines formula (1)
fi
q+ (L
d-L
q) i
di
q] part, p(ψ
fi
q) be the basic electromagnetic torque that permanent magnetic field and armature reacting field interact and produce, be again permanent-magnet torque; p(L
d-L
q) i
di
qit is the asymmetric and reluctance torque that produces of d, q axle magnetic circuit by motor.
Reluctance torque p (L
d-L
q) i
di
qin, p is the integers such as 1,2,3; The d-axis synchronous inductance L of permagnetic synchronous motor
dbe generally less than quadrature axis synchronous inductance L
qso, (L
d-L
q) < 0; Quadrature axis current i
qto be greater than 0.If realize reluctance torque p (L
d-L
q) i
di
qbe greater than 0, direct-axis current i
dmust be less than 0.
The present invention is by the quadrature axis magnetic circuit between permanent magnet machine rotor adjacent pole, flux-obstruction being set, thereby increases the magnetic resistance of quadrature axis magnetic circuit, allows d-axis synchronous inductance L
dbe greater than quadrature axis synchronous inductance L
q, make (L
d-L
q) > 0.If realize reluctance torque p (L
d-L
q) i
di
qbe greater than 0, direct-axis current i
dmust be greater than 0.Motor operates in design of electrical motor rated speed when following like this, is greater than zero direct-axis current i
dconsistent with the magnetic direction that permanent magnet produces, increased magnetic field of permanent magnet.In the time of motor output speed need to being greater than to the rated speed (the weak magnetic control system of magneto) of design of electrical motor, first by direct-axis current i
dprogressively be reduced to 0, then make direct-axis current i
dbe less than 0, then strengthen the weak magnetic current i of d-axis
dallow motor reach desirable speed.Will weaken direct-axis current i like this
dimpact on permanent magnet degaussing, can adopt than d-axis synchronous inductance L
dbe less than quadrature axis synchronous inductance L
qrotor structure still less, thinner permanent magnet, lower motor cost and guarantee that the torque that magneto is identical produces ability.
Beneficial effect of the present invention is: by flux-obstruction being set on the quadrature axis magnetic circuit between the permanent magnetism magnetic pole of internal rotor and adopting difform permanent magnet pole, keep magneto to produce torque capacity, reduced the demagnetizing effect of direct-axis current to permanent magnet in magneto running; Can adopt thinner permanent magnet, reduce the cost of magneto.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the difform permanent magnet schematic diagram of the present invention.
Wherein, 1, rotor core; 2, permanent magnet; 3, flux-obstruction.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, a kind of d-axis inductance is greater than the permanent magnet machine rotor of quadrature axis inductance, comprises the rotor core 1, permanent magnet 2 and the flux-obstruction 3 that rotor punching, consist of; Wherein, permanent magnet 2 is arranged at rotor core 1 inside, along rotor core 1 even circumferential, distributes, and on the quadrature axis magnetic circuit between adjacent permanent magnet 2, flux-obstruction 3 is set.
The shape of flux-obstruction 3 includes but not limited to circular hole, rectangle, arc, fan-shaped, leg-of-mutton one or more combination.
The shape of permanent magnet 2 includes but not limited to " U ", " V ", " W ", " one " word, rectangular shape.
Operation principle of the present invention is:
The electromagnetic torque equation of interior permanent magnet machines:
T in formula
em---the electromagnetic torque of motor;
D---subscript d represents direct axis component;
Q---subscript q represents direct axis component;
U
d, u
q---the d of stator voltage, q axle component;
I
d, i
q---the d of stator current, q axle component;
ψ
d, ψ
q---the d of stator magnetic linkage, q axle component;
L
d, L
q---the d of motor, q axle synchronous inductance;
ψ
f---the unloaded permanent magnetism magnetic linkage of motor in d-q coordinate system,
Ψ
f=E
0/ ω, E
0for the empty load of motor back electromotive force phase effective value in three-phase system, the electric angle speed that ω is magneto;
P---motor number of pole-pairs is generally the integers such as 1,2,3.
ω---electric angle speed.
P[ψ in interior permanent magnet machines formula (1)
fi
q+ (L
d-L
q) i
di
q] part, p(ψ
fi
q) be the basic electromagnetic torque that permanent magnetic field and armature reacting field interact and produce, be again permanent-magnet torque; p(L
d-L
q) i
di
qit is the asymmetric and reluctance torque that produces of d, q axle magnetic circuit by motor.
Reluctance torque p (L
d-L
q) i
di
qin, p is the integers such as 1,2,3; The d-axis synchronous inductance L of permagnetic synchronous motor
dbe generally less than quadrature axis synchronous inductance L
qso, (L
d-L
q) < 0; Quadrature axis current i
qto be greater than 0.If realize reluctance torque p (L
d-L
q) i
di
qbe greater than 0, direct-axis current i
dmust be less than 0.
The present invention is by the quadrature axis magnetic circuit between permanent magnet machine rotor adjacent pole, flux-obstruction 3 being set, thereby increases the magnetic resistance of quadrature axis magnetic circuit, allows d-axis synchronous inductance L
dbe greater than quadrature axis synchronous inductance L
q, make (L
d-L
q) > 0.If realize reluctance torque p (L
d-L
q) i
di
qbe greater than 0, direct-axis current i
dmust be greater than 0.Motor operates in design of electrical motor rated speed when following like this, is greater than zero direct-axis current i
dconsistent with the magnetic direction that permanent magnet produces, increased magnetic field of permanent magnet.In the time of motor output speed need to being greater than to the rated speed (the weak magnetic control system of magneto) of design of electrical motor, first by direct-axis current i
dprogressively be reduced to 0, then make direct-axis current i
dbe less than 0, then strengthen the weak magnetic current i of d-axis
dallow motor reach desirable speed.Will weaken direct-axis current i like this
dimpact on permanent magnet degaussing, can adopt than d-axis synchronous inductance L
dbe less than quadrature axis synchronous inductance L
qrotor structure still less, thinner permanent magnet, lower motor cost and guarantee that the torque that magneto is identical produces ability.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (3)
1. d-axis inductance is greater than a permanent magnet machine rotor for quadrature axis inductance, it is characterized in that: comprise the rotor core, permanent magnet and the flux-obstruction that rotor punching, consist of; Wherein, permanent magnet is arranged at rotor core inside, along rotor core even circumferential, distributes, and on the quadrature axis magnetic circuit between adjacent permanent magnet, flux-obstruction is set.
2. a kind of d-axis inductance as claimed in claim 1 is greater than the permanent magnet machine rotor of quadrature axis inductance, it is characterized in that: the shape of described flux-obstruction includes but not limited to circular hole, rectangle, arc, fan-shaped, leg-of-mutton one or more combination.
3. a kind of d-axis inductance as claimed in claim 1 is greater than the permanent magnet machine rotor of quadrature axis inductance, it is characterized in that: the shape of described permanent magnet includes but not limited to " U ", " V ", " W ", " one " word, rectangular shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310643552.XA CN103607061A (en) | 2013-12-03 | 2013-12-03 | Permanent magnet motor rotor with direct-axis inductance larger than quadrature-axis inductance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310643552.XA CN103607061A (en) | 2013-12-03 | 2013-12-03 | Permanent magnet motor rotor with direct-axis inductance larger than quadrature-axis inductance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103607061A true CN103607061A (en) | 2014-02-26 |
Family
ID=50125266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310643552.XA Pending CN103607061A (en) | 2013-12-03 | 2013-12-03 | Permanent magnet motor rotor with direct-axis inductance larger than quadrature-axis inductance |
Country Status (1)
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|---|---|
| CN (1) | CN103607061A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932806A (en) * | 2016-06-28 | 2016-09-07 | 无锡新大力电机有限公司 | Permanent magnet synchronous motor with composite rotor structure |
| EP3121936A4 (en) * | 2014-03-18 | 2017-03-08 | Nissan Motor Co., Ltd | Rotor structure for rotating electric machine |
| CN106787565A (en) * | 2017-01-23 | 2017-05-31 | 徐州中矿大传动与自动化有限公司 | Anti- salient pole permanent magnet reluctance motor |
| CN106849524A (en) * | 2017-01-23 | 2017-06-13 | 徐州中矿大传动与自动化有限公司 | The box-like drive system of permanent magnet direct-driven explosion-proof variable frequency variable speed group of motors |
| CN108023452A (en) * | 2017-12-20 | 2018-05-11 | 卧龙电气集团股份有限公司 | A kind of high-voltage explosion-proof frequency conversion drive three-phase permanent-magnetic synchronous motors |
| CN112615353A (en) * | 2020-12-04 | 2021-04-06 | 珠海格力电器股份有限公司 | Overvoltage protection method and device, electronic equipment and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345442A (en) * | 2007-07-10 | 2009-01-14 | 上海海立（集团）股份有限公司 | Rotor of electric motor used for compressor |
| CN101529694A (en) * | 2006-08-16 | 2009-09-09 | 惠而浦股份公司 | A synchronous machine and a process of manufacturing a synchronous machine |
| CN202652025U (en) * | 2012-06-11 | 2013-01-02 | 中国矿业大学 | Reverse salient pole permanent magnet synchronous motor |
-
2013
- 2013-12-03 CN CN201310643552.XA patent/CN103607061A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101529694A (en) * | 2006-08-16 | 2009-09-09 | 惠而浦股份公司 | A synchronous machine and a process of manufacturing a synchronous machine |
| CN101345442A (en) * | 2007-07-10 | 2009-01-14 | 上海海立（集团）股份有限公司 | Rotor of electric motor used for compressor |
| CN202652025U (en) * | 2012-06-11 | 2013-01-02 | 中国矿业大学 | Reverse salient pole permanent magnet synchronous motor |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3121936A4 (en) * | 2014-03-18 | 2017-03-08 | Nissan Motor Co., Ltd | Rotor structure for rotating electric machine |
| US9780612B2 (en) | 2014-03-18 | 2017-10-03 | Nissan Motor Co., Ltd. | Rotor structure for electric rotating machine |
| CN105932806A (en) * | 2016-06-28 | 2016-09-07 | 无锡新大力电机有限公司 | Permanent magnet synchronous motor with composite rotor structure |
| CN106787565A (en) * | 2017-01-23 | 2017-05-31 | 徐州中矿大传动与自动化有限公司 | Anti- salient pole permanent magnet reluctance motor |
| CN106849524A (en) * | 2017-01-23 | 2017-06-13 | 徐州中矿大传动与自动化有限公司 | The box-like drive system of permanent magnet direct-driven explosion-proof variable frequency variable speed group of motors |
| CN108023452A (en) * | 2017-12-20 | 2018-05-11 | 卧龙电气集团股份有限公司 | A kind of high-voltage explosion-proof frequency conversion drive three-phase permanent-magnetic synchronous motors |
| CN112615353A (en) * | 2020-12-04 | 2021-04-06 | 珠海格力电器股份有限公司 | Overvoltage protection method and device, electronic equipment and storage medium |
| CN112615353B (en) * | 2020-12-04 | 2022-07-12 | 珠海格力电器股份有限公司 | Overvoltage protection method and device, electronic equipment and storage medium |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140226 |
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