CN1319267C - Linear step motor position sensing system - Google Patents
Linear step motor position sensing system Download PDFInfo
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- CN1319267C CN1319267C CNB200310100080XA CN200310100080A CN1319267C CN 1319267 C CN1319267 C CN 1319267C CN B200310100080X A CNB200310100080X A CN B200310100080XA CN 200310100080 A CN200310100080 A CN 200310100080A CN 1319267 C CN1319267 C CN 1319267C
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- magnetic field
- step motor
- linear step
- utmost point
- residual magnetic
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Abstract
The present invention relates to a linear step motor position sensing system which is mainly composed of a magnetic sensor and a stabilizing device for a residual magnetic field, wherein the stabilizing device for a residual magnetic field can change an original and disorder residual magnetic field on a stator into a fixed-value residual magnetic field, and thus, an accurate position feedback value can be obtained; then high-accuracy position control is obtained by compensation.
Description
Technical field
The present invention relates to the motor position sensing system, refer in particular to a kind of linear step motor position sensing.
Background technology
General linear step motor mainly is progressively to be pushed ahead and start with fixing pitch by the interaction of rotor and stator; The double wedge that has the variable magnetic pole stator on this rotor and then be by many fixed knot distances constitutes; By the epitrochanterian magnetic pole of conversion, rotor is moved on stator according to fixing pitch.
Yet along with science and technology is maked rapid progress, the demand of high accurate positioning degree is arisen spontaneously, for the demand that reaches high accurate positioning degree increases by a magnetic position sensor on linear step motor; Usually transducer is made up of double wedge and Magnetic Induction assembly and a magnetic field itself is provided, when rotor-position changes, utilize the variation of air-gap reluctance between stator and the transducer, the position signalling that records is delivered to control device control, and obtain high-precision Position Control to form the loop circuit.
Because the rotor of conventional linear stepper motor is after moving on the stator, (N, the S utmost point during rotor motion on it can alternately produce in the double wedge of stator surface can be residual mixed and disorderly magnetic field, and the size in magnetic field also can change with the speed of movement velocity), when magnetic sensor is followed rotor afterwards through stator, can be subjected to mixed and disorderly influence of magnetic field residual on the stator and produce the error that to estimate, cause the Position Control stability of loop circuit can't reach requirement.
Therefore comprehensively above-mentioned, the real necessity that has urgent improvement to progress greatly of prior art linear step motor magnetic position sensor.
Summary of the invention
The purpose of this invention is to provide a kind of linear step motor position sensing, it can stablize the residual magnetic field value and error that the unlikely generation of position sensing can't be estimated.
The technical solution used in the present invention is for achieving the above object: the linear step motor position sensing comprises: a magnetic sensor, utilize the magnetic flux change on the above-mentioned linear step motor stator of Magnetic Induction principle sensing, to obtain position back coupling value; One residual magnetic field stabilizing arrangement, the outside that it is arranged at above-mentioned magnetic sensor makes the residual magnetic field value magnetic stability on the above-mentioned linear step motor stator, and allows the above-mentioned magnetic sensor can be with magnetic flux change sensing motor stator position exactly; The residual magnetic field stabilizing arrangement surrounds the outer periphery of above-mentioned magnetic sensor; The residual magnetic field stabilizing arrangement has the N utmost point and the S utmost point; The N utmost point of residual magnetic field stabilizing arrangement and the S utmost point are that inner cap and the enclosing cover by the logical magnetic of permanent magnet and tool produced; The N utmost point of residual magnetic field stabilizing arrangement and the S utmost point are that inner cap and the enclosing cover by the logical magnetic of electromagnet and tool produced; Residual magnetic field value on the linear step motor stator is to be magnetized to almost saturated degree.
The stator of linear step motor (Linear Steeping Motors) is made of many double wedges, when rotor is mobile on stator, position sensing also moves on stator with rotor, utilize the magnetic flux change on the Magnetic Induction principle sensing stator, obtaining the value of position back coupling accurately, and obtain high-precision Position Control.
Its N, S magnetic field can alternately produce and the magnetic field size also can change when rotor is mobile on stator, therefore the residual mixed and disorderly magnetic field of meeting is on the surface of stator, the residual magnetic field that position sensing is subjected to the stator of linear step motor influences and makes sensing value unstable easily, therefore the present invention's design increases by a residual magnetic field stabilizing arrangement in position sensing, with on the stator originally mixed and disorderly residual magnetic field become the residual magnetic field of a fixed value, obtain the value of position back coupling accurately then by compensation.
Remove in the position sensing that a magnetic sensor, the present invention are arranged is to add the residual magnetic field stabilizing arrangement around magnetic sensor.No matter when magnetic sensor toward which direction when moving, this device provides the residual magnetic field of a fixed value of stator of linear step motor, so can be corrected easily, compensate and obtain the value of position back coupling accurately because residual magnetic field is a fixed value.
Have the N utmost point and the S utmost point in the residual magnetic field stabilizing arrangement of the present invention, and the N utmost point and the S utmost point form the loop and produce magnetic field, in order to make this magnetic field can overcome original residual magnetic field on the stator and the residual magnetic field of a stable size to be provided, so magnetic field that the residual magnetic field stabilizing arrangement is produced, the tooth of stator surface must be magnetized into saturation condition (arriving the magnetization degree of demand), so the stator surface that magnetic sensor passed through all has been magnetized to the residual magnetic field of fixed value.
Therefore the stator surface residual magnetic field that magnetic sensor of the present invention passed through is all a fixed value, can be predicted in advance and can be compensated so magnetic sensor is subjected to the situation of residual magnetic field influence, to obtain the value of position back coupling accurately.
Use beneficial effect of the present invention to be: magnetic sensor is the sensing magnetic flux change exactly, obtaining the value of position back coupling accurately, and obtains high-precision Position Control.
Description of drawings
Fig. 1 is the schematic diagram of linear step motor position sensing of the present invention;
Fig. 2 is the A-A section signal of figure one;
10 residual magnetic field stabilizing arrangements, 11 inner caps, 12 enclosing covers, 13 magnet
20 magnetic sensors, 30 stators, 31 double wedges
Further understand feature of the present invention and technology contents for convenience, please consult following relevant embodiments of the present invention in detail, however this execution mode and graphic only for explanation and with reference to usefulness, but not in order to the present invention is done any restriction.
Embodiment
Linear step motor is a kind of floating the two poles of the earth of magnetic exclusion principle that utilizes, and directly drives workpiece and carries out the product of complex space orbiting motion; And position sensing is when linear step motor moves, and the signal that moves detecting is delivered to control device, makes the mobile function with position back coupling of linear step motor.
Fig. 1 is the schematic diagram of linear step motor position sensing of the present invention, wherein position sensing has comprised magnetic sensor 20 and residual magnetic field stabilizing arrangement 10, and surrounded by residual magnetic field stabilizing arrangement 10 fully around the magnetic sensor 20, when on the stator 30 of position sensing at linear step motor no matter toward which direction when moving, utilize the magnetic flux change between Magnetic Induction principle sensing stator 30 and the magnetic sensor 20, or detection computations goes out change in magnetic flux density (change in magnetic flux density=magnetic flux/every square centimeter) in the lump, and then learn the change in location of rotor (not drawing).
Fig. 2 is the A-A generalized section of Fig. 1, wherein residual magnetic field stabilizing arrangement 10 is made of inner cap 11, enclosing cover 12 and magnet 13, inner cap 11 is placed on the outside of magnetic sensor 20, and enclosing cover 12 is placed on the outside of inner cap 11,13 of magnet place between inner cap 11 and the enclosing cover 12, and magnet 13 can be the object that permanent magnet or electromagnet etc. have the N utmost point and the S utmost point, makes inner cap 11 and enclosing cover 12 can form the loop of the S utmost point-N utmost point or the N utmost point-S utmost point.The magnetic line of force sends the back by the N utmost point of magnet 13 and enters stator 30 by enclosing cover 12 as shown in the figure, relend inner cap 11 and getting back to the S utmost point formation loop of magnet 13, double wedge 31 with magnetization stator 30, make the residual magnetic field value on it be magnetized into fixed value, and allow magnetic sensor 20 sensing magnetic flux change exactly, obtaining the value of position back coupling accurately, and obtain high-precision Position Control.
Claims (6)
1. linear step motor position sensing is characterized in that: a magnetic sensor, utilize the magnetic flux change on the above-mentioned linear step motor stator of Magnetic Induction principle sensing, to obtain position back coupling value;
One residual magnetic field stabilizing arrangement, the outside that it is arranged at above-mentioned magnetic sensor makes the residual magnetic field value magnetic stability on the above-mentioned linear step motor stator, and allows the above-mentioned magnetic sensor can be with magnetic flux change sensing motor stator position exactly.
2. linear step motor position sensing according to claim 1 is characterized in that: the residual magnetic field stabilizing arrangement surrounds the outer periphery of above-mentioned magnetic sensor.
3. linear step motor position sensing according to claim 1 is characterized in that: the residual magnetic field stabilizing arrangement has the N utmost point and the S utmost point.
4. linear step motor position sensing according to claim 3 is characterized in that: the N utmost point of residual magnetic field stabilizing arrangement and the S utmost point are that inner cap and the enclosing cover by the logical magnetic of permanent magnet and tool produced.
5. linear step motor position sensing according to claim 3 is characterized in that: the N utmost point of residual magnetic field stabilizing arrangement and the S utmost point are that inner cap and the enclosing cover by the logical magnetic of electromagnet and tool produced.
6. linear step motor position sensing according to claim 3 is characterized in that: the residual magnetic field value on the linear step motor stator is to be magnetized to saturation condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310100080XA CN1319267C (en) | 2003-10-09 | 2003-10-09 | Linear step motor position sensing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310100080XA CN1319267C (en) | 2003-10-09 | 2003-10-09 | Linear step motor position sensing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1606231A CN1606231A (en) | 2005-04-13 |
| CN1319267C true CN1319267C (en) | 2007-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200310100080XA Expired - Fee Related CN1319267C (en) | 2003-10-09 | 2003-10-09 | Linear step motor position sensing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1319267C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5552682A (en) * | 1993-04-27 | 1996-09-03 | Sankyo Seiki Mfg. Co., Ltd. | Device for detecting rotational position of brushless motor |
| CN1195917A (en) * | 1997-03-18 | 1998-10-14 | 三星电子株式会社 | Apparatus for sensing position of switched reluctance motor |
-
2003
- 2003-10-09 CN CNB200310100080XA patent/CN1319267C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5552682A (en) * | 1993-04-27 | 1996-09-03 | Sankyo Seiki Mfg. Co., Ltd. | Device for detecting rotational position of brushless motor |
| CN1195917A (en) * | 1997-03-18 | 1998-10-14 | 三星电子株式会社 | Apparatus for sensing position of switched reluctance motor |
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| Publication number | Publication date |
|---|---|
| CN1606231A (en) | 2005-04-13 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070530 Termination date: 20181009 |