CN106712415B - Motor without position sensor - Google Patents
Motor without position sensor Download PDFInfo
- Publication number
- CN106712415B CN106712415B CN201710077343.1A CN201710077343A CN106712415B CN 106712415 B CN106712415 B CN 106712415B CN 201710077343 A CN201710077343 A CN 201710077343A CN 106712415 B CN106712415 B CN 106712415B
- Authority
- CN
- China
- Prior art keywords
- rotor
- motor
- rotors
- stator
- position sensor
- 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.)
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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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Brushless Motors (AREA)
Abstract
The invention discloses a kind of motor without position sensor, it includes a motor shaft, a stator and a rotor, rotor includes a first rotor and two the second rotors, the first rotor and the fixation of two the second rotors are nested on motor shaft, the first rotor is located in stator, and two the second rotors are located at the two sides of the first rotor, and two the second rotors are at least a part of to be located in stator, two bitrochanteric numbers of poles are identical, and the first rotor and bitrochanteric number of poles are different.Rotor with salient pole of the invention is not influenced by stator field caused by motor Fundamental-frequency Current.
Description
Technical field
The present invention relates to a kind of motor without position sensor.
Background technique
In the prior art, the position detection of motor is come real generally by the position sensor being mounted on electric machine main shaft
Existing, installation site sensor can bring following disadvantage: 1, improving the cost of motor；2, it is such as high in adverse circumstances to reduce motor
Reliability under temperature, high pressure and high vibration environment.
And for motor without position sensor, when the operation of motor low speed and zero-speed start, the position detection of motor is logical
High-frequency signal injection detection rotor with salient pole is crossed come what is realized, there is also following disadvantages for this method: 1, for surface-mount type magnet steel electricity
Machine, saliency very little, detection difficult；2, for embedded magnet steel motor, the Fundamental-frequency Current of motor is for machine saliency shadow
Sound is very big, and when motor high current starts or accelerates, due to the influence of magnet steel saturation, the saliency of motor inductances is often deformed
Serious even to disappear, this has resulted in high-frequency signal injection precision under high current or high load operation and has substantially reduced even failure
Problem.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of motor without position sensor, rotor with salient pole not by
Stator field caused by motor Fundamental-frequency Current influences.
In order to solve the above technical problems, motor without position sensor provided by the invention, 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 located at the two sides of the first rotor, and two the second rotors are equal
At least a part of to be located in stator, two bitrochanteric numbers of poles are identical, and the first rotor and bitrochanteric number of poles are different.
Preferably, the ratio between described axial length of bitrochanteric axial length and rotor is less than 1/20.
Preferably, the ratio between described axial length of bitrochanteric axial length and rotor is 1/40.
Preferably, between the first rotor and two the second rotors, there are the air gaps of 1-2mm
After using the above structure, compared with prior art, the present invention having the advantage that
In the present invention, the first rotor and bitrochanteric number of poles are different, so the saliency modulation provided by the second rotor
Signal can be independently of motor fundamental frequency signal, thus it is that stator field is stronger that the detection of rotor-position can work in high current
It is guaranteed, is not influenced by stator field caused by motor Fundamental-frequency Current under state.
Detailed description of the invention
Fig. 1 is cross-sectional view of the invention；
Fig. 2 is perspective view 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
Present invention will be explained in further 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 include a first rotor 301 and two the second rotors 302, and the first rotor 301 and two the second rotors 302 are solid
Surely it is nested on motor shaft 1, the first rotor 301 and two the second rotors 302 are rotated synchronously with motor shaft 1, the first rotor 301
In stator 2, two the second rotors 302 are located at the two sides of the first rotor 301, and two the second rotors 302 are at least
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 first rotor 301 and the second rotor 302 is not
Together.
There are the air gaps of 1-2mm between the first rotor 301 and two the second rotors 302, to prevent leak-stopping magnetic.
The ratio between axial length and the axial length of rotor 3 of second rotor 302 are 1/40.
The present invention is different from the harmonic component of motor fundamental frequency number of poles using stator winding, and is used for second turn of position detection
Sub- number of poles is selected as a certain harmonic component number of poles of stator winding, so the rotor-position signal generated is believed independently of motor fundamental frequency
Number, so that the rotor with salient pole of the motor is not influenced by stator field caused by motor Fundamental-frequency Current, so that electric
Machine position detection is accurate.
Generated mmf harmonics component is such as in motor gas-gap for 18 slot, 4 pairs of pole stator Double Layer Windings of motor of the present invention
Shown in Fig. 5, in Fig. 5, the air-gap mmf component of motor is up to 4 pairs of poles of fundamental wave, therefore as shown in figure 3, stator winding
4 pairs of pole main rotors (i.e. the first rotor 301) can be driven；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 (i.e. the second rotor 302),
In this way, motor of the invention can carry out rotor-position detections by 14 pairs of pole gear type rotors (i.e. the second rotor 302), due to the
Number of poles selected by one rotor and the second rotor is different, so the salient pole provided by 14 pairs of pole gear type rotors (i.e. the second rotor 302)
Property modulated signal can be independently of motor fundamental frequency signal, thus it is stator field that the detection of rotor-position can work in high current
It is guaranteed under stronger state.
The foregoing is only a description of the preferred application of the present invention, but is not to be construed as the limit to claim
System, structure of the invention can have other variations, be not limited to above structure.In short, all in independent claims of the invention
Protection scope in made various change be within the scope of the invention.
Claims (4)
1. a kind of motor without position sensor, which is characterized in that it includes a motor shaft (1), a stator (2) and a rotor (3),
Rotor (3) includes a first rotor (301) and two the second rotors (302), the first rotor (301) and two the second rotors
(302) fixation is nested on motor shaft (1), and the first rotor (301) is located in stator (2), and two the second rotors (302) are respectively
Positioned at the two sides of the first rotor (301), two the second rotors (302) are at least a part of to be located in stator (2), and two second
The number of poles of rotor (302) is identical, and the first rotor (301) is different with the number of poles of the second rotor (302).
2. motor without position sensor according to claim 1, it is characterised in that: the axis of second rotor (302)
To the ratio between axial length of length and rotor (3) less than 1/20.
3. motor without position sensor according to claim 2, it is characterised in that: the axis of second rotor (302)
It is 1/40 to the ratio between axial length of length and rotor (3).
4. motor without position sensor according to claim 1, it is characterised in that: the first rotor (301) and two
There are the air gaps of 1-2mm between a second rotor (302).
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 CN106712415A (en) | 2017-05-24 |
| CN106712415B true 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 |
|---|---|
| CN106712415A (en) | 2017-05-24 |
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