CN106712415A - Position-sensorless motor - Google Patents
Position-sensorless motor Download PDFInfo
- Publication number
- CN106712415A CN106712415A CN201710077343.1A CN201710077343A CN106712415A CN 106712415 A CN106712415 A CN 106712415A CN 201710077343 A CN201710077343 A CN 201710077343A CN 106712415 A CN106712415 A CN 106712415A
- Authority
- CN
- China
- Prior art keywords
- rotor
- motor
- rotors
- stator
- poles
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
-
- 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
-
- 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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
The present invention discloses a position-sensorless motor. The position-sensorless motor comprises a motor shaft, a stator and a rotor; the rotor comprises a first rotor and two second rotors; the first rotor and the two second rotors fixedly sleeve the motor shaft; the first rotor is located in the stator; the two second rotors are located at two sides of the first rotor respectively; at least part of each of the two second rotors is located in the stator; the number of the poles of one second rotor is identical with the number of the poles of the other second rotor; and the number of the poles of the first rotor is different from the number of the poles of the second rotor. According to the position-sensorless motor of the invention, the polarity of the salient poles of the rotor is not affected by a stator magnetic field generated by the fundamental frequency current of the motor.
Description
Technical field
The present invention relates to a kind of motor without position sensor.
Background technology
In the prior art, the position detection of motor comes real generally by the position sensor on electric machine main shaft
Existing, installation site sensor can bring following shortcoming：1st, the cost of motor is improved；2nd, motor is reduced in adverse circumstances such as height
Reliability under temperature, high pressure and high vibration environment.
And for motor without position sensor, when motor low cruise and zero-speed start, the position detection of motor is logical
Cross high-frequency signal injection and detect rotor with salient pole come what is realized, this method there is also following shortcoming：1st, for surface-mount type magnet steel electricity
Machine, its saliency very little, detection difficult；2nd, for embedded magnet steel motor, the Fundamental-frequency Current of motor is for machine saliency shadow
Ring very big, when motor high current starts or accelerates, due to the influence of magnet steel saturation, the saliency of motor inductances often deforms
Serious even to disappear, this has resulted in high-frequency signal injection precision under high current or high capacity operation and has substantially reduced even failure
Problem.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of motor without position sensor, and its rotor with salient pole is not received
Stator field influence produced by motor Fundamental-frequency Current.
In order to solve the above technical problems, the motor without position sensor that the present invention is provided, it includes a motor shaft, a stator
With a rotor, rotor includes a first rotor and two the second rotors, and the first rotor and the fixation of two the second rotors are nested with
On motor shaft, the first rotor is located in stator, and two the second rotors are respectively positioned at the both sides of the first rotor, and two the second rotors are equal
At least part of two bitrochanteric numbers of poles are identical in stator, and the first rotor and bitrochanteric number of poles are different.
Preferably, the ratio between axial length of described bitrochanteric axial length and rotor is less than 1/20.
Preferably, the ratio between axial length of described bitrochanteric axial length and rotor is 1/40.
Preferably, leaving the air gap of 1-2mm between described the first rotor and two the second rotors
After above structure, the present invention compared with prior art, has the following advantages that：
In the present invention, the first rotor and bitrochanteric number of poles are different, so the saliency modulated signal provided by the second rotor
Can be independently of motor fundamental frequency signal, thus the detection of rotor-position can be the stronger state of stator field in high current work
Under be guaranteed, do not influenceed by the stator field produced by motor Fundamental-frequency Current.
Brief description of the drawings
Fig. 1 is sectional view of the invention；
Fig. 2 is stereogram of the invention；
Fig. 3 is that the present invention removes the side view after the second rotor；
Fig. 4 is side view of the invention；
Fig. 5 is mmf harmonics component map.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawings and detailed description.
As shown in Fig. 1, Fig. 2, motor without position sensor of the invention, it includes a motor shaft 1, a stator 2 and one turn
Son 3, rotor 3 includes a first rotor 301 and two the second rotors 302, and the first rotor 301 and two the second rotors 302 are solid
Surely be nested with motor shaft 1, the first rotor 301 and two the second rotors 302 with the synchronous axial system of motor shaft 1, the first rotor 301
In stator 2, respectively positioned at the both sides of the first rotor 301, two the second rotors 302 are at least for two the second rotors 302
A part is located in stator 2, and the number of poles of two the second rotors 302 is identical, and the number of poles of the rotor 302 of the first rotor 301 and second is not
Together.
The air gap of 1-2mm is left between the first rotor 301 and two the second rotors 302, in case leak-stopping magnetic.
The ratio between the axial length of the second described rotor 302 and the axial length of rotor 3 are 1/40.
The present invention is different from the harmonic component of motor fundamental frequency number of poles using stator winding, and for second turn of position detection
Sub- number of poles elects a certain harmonic component number of poles of stator winding as, so the rotor-position signal for producing is believed independently of motor fundamental frequency
Number, so that the rotor with salient pole of the motor is not influenceed by the stator field produced by motor Fundamental-frequency Current, so that electric
It is accurate that detection is put in seat in the plane.
The produced mmf harmonics component in motor gas-gap of 18 groove, 4 pairs of pole stator Double Layer Windings of motor of the present invention is such as
Shown in Fig. 5, in Figure 5, the air-gap mmf component of motor is 4 pairs of poles of fundamental wave, therefore as shown in figure 3, stator winding to the maximum
4 pairs of pole main rotors can be driven（That is the first rotor 301）；Meanwhile, the stator winding has larger air gap magnetic for 14 pairs of pole rotors
Kinetic potential order harmonic components, therefore as shown in figure 4, stator winding can also drive 14 pairs of pole gear type rotors（That is the second rotor 302）,
So, motor of the invention can be by 14 pairs of pole gear type rotors（That is the second rotor 302）Rotor-position detection is carried out, due to
One rotor and number of poles selected by the second rotor are different, so by 14 pairs of pole gear type rotors（That is the second rotor 302）The salient pole of offer
Property modulated signal can be independently of motor fundamental frequency signal, thus the detection of rotor-position can be stator field in high current work
It is guaranteed in the state of relatively strong.
Below only just present invention application preferably example is made that explanation, but is not to be construed as the limit to claim
System, structure of the invention can have other to change, be not limited to said structure.In a word, it is all in independent claims of the invention
Protection domain in the various change made it is within the scope of the present invention.
Claims (4)
1. a kind of motor without position sensor, it is characterised in that it includes a motor shaft（1）, a stator（2）With a rotor（3）,
Rotor（3）Including a first rotor（301）With two the second rotors（302）, the first rotor（301）With two the second rotors
（302）Fixation is nested with motor shaft（1）On, the first rotor（301）Positioned at stator（2）It is interior, two the second rotors（302）Respectively
Positioned at the first rotor（301）Both sides, two the second rotors（302）It is at least part of positioned at stator（2）It is interior, two second
Rotor（302）Number of poles it is identical, the first rotor（301）With the second rotor（302）Number of poles it is different.
2. motor without position sensor according to claim 1, it is characterised in that：The second described rotor（302）Axle
To length and rotor（3）The ratio between axial length be less than 1/20.
3. motor without position sensor according to claim 2, it is characterised in that：The second described rotor（302）Axle
To length and rotor（3）The ratio between axial length be 1/40.
4. motor without position sensor according to claim 1, it is characterised in that：Described the first rotor（301）With two
Individual second rotor（302）Between leave the air gap of 1-2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077343.1A CN106712415B (en) | 2017-02-14 | 2017-02-14 | Motor without position sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077343.1A CN106712415B (en) | 2017-02-14 | 2017-02-14 | Motor without position sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106712415A true CN106712415A (en) | 2017-05-24 |
| CN106712415B CN106712415B (en) | 2018-12-25 |
Family
ID=58911418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710077343.1A Active CN106712415B (en) | 2017-02-14 | 2017-02-14 | Motor without position sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106712415B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0577980A1 (en) * | 1992-06-10 | 1994-01-12 | Fuji Electric Co., Ltd. | Ac variable speed driving apparatus and electric vehicle using the same |
| CN202059305U (en) * | 2011-05-25 | 2011-11-30 | 上海众联能创新能源科技有限公司 | A position sensorless motor |
| CN102301570A (en) * | 2009-01-29 | 2011-12-28 | 罗尔夫·施特罗特曼 | Position Determination Of An Electric Drive Having Two Stators And Two Rotors |
| CN102780373A (en) * | 2012-07-06 | 2012-11-14 | 天津大学 | Permanent magnet motor with obvious rotor position features |
| CN104753272A (en) * | 2015-02-05 | 2015-07-01 | 南京航空航天大学 | Combined type brushless direct-current permanent magnet magnetic flow switching motor and axial proportion calculation method |
| CN105048740A (en) * | 2015-07-08 | 2015-11-11 | 南京航空航天大学 | Permanent magnet and variable reluctance parallel hybrid excitation brushless motor |
| CN106253621A (en) * | 2016-09-29 | 2016-12-21 | 日本电产凯宇汽车电器（江苏）有限公司 | A kind of EPS brushless electric machine of rotor unequal length |
-
2017
- 2017-02-14 CN CN201710077343.1A patent/CN106712415B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0577980A1 (en) * | 1992-06-10 | 1994-01-12 | Fuji Electric Co., Ltd. | Ac variable speed driving apparatus and electric vehicle using the same |
| CN102301570A (en) * | 2009-01-29 | 2011-12-28 | 罗尔夫·施特罗特曼 | Position Determination Of An Electric Drive Having Two Stators And Two Rotors |
| CN202059305U (en) * | 2011-05-25 | 2011-11-30 | 上海众联能创新能源科技有限公司 | A position sensorless motor |
| CN102780373A (en) * | 2012-07-06 | 2012-11-14 | 天津大学 | Permanent magnet motor with obvious rotor position features |
| CN104753272A (en) * | 2015-02-05 | 2015-07-01 | 南京航空航天大学 | Combined type brushless direct-current permanent magnet magnetic flow switching motor and axial proportion calculation method |
| CN105048740A (en) * | 2015-07-08 | 2015-11-11 | 南京航空航天大学 | Permanent magnet and variable reluctance parallel hybrid excitation brushless motor |
| CN106253621A (en) * | 2016-09-29 | 2016-12-21 | 日本电产凯宇汽车电器（江苏）有限公司 | A kind of EPS brushless electric machine of rotor unequal length |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106712415B (en) | 2018-12-25 |
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