CN218003695U - Dipolar magnet translation long coil magnetic measuring machine - Google Patents
Dipolar magnet translation long coil magnetic measuring machine Download PDFInfo
- Publication number
- CN218003695U CN218003695U CN202221812995.8U CN202221812995U CN218003695U CN 218003695 U CN218003695 U CN 218003695U CN 202221812995 U CN202221812995 U CN 202221812995U CN 218003695 U CN218003695 U CN 218003695U
- Authority
- CN
- China
- Prior art keywords
- coil
- bracket
- dipolar magnet
- long
- dipolar
- 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
Images
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
The utility model provides a dipolar magnet translation long coil magnetic testing machine, which comprises a bracket, a coil bracket and a coil framework which are arranged from bottom to top in sequence, wherein a coil is wound on a convex coil framework, the upper surface of the coil bracket is processed into a groove, and the coil, the coil bracket and the coil framework are combined to form a coil bracket; the coil support is placed on the central line of the upper surface of the bracket and can slide along the directions of two sides of the central line of the bracket, two ends of the coil support are respectively fixed on the two linear motion platforms, and the coil support can move and cut the magnetic field of the dipolar magnet on the upper surface of the coil bracket to obtain a corresponding voltage signal by driving the two linear motion platforms. The utility model discloses the long coil magnetism of dipolar magnet translation surveys machine passes through coil carrier's slide measurement dipolar magnet magnetic field, convenient operation, and it is swift simple to measure.
Description
Technical Field
The utility model belongs to the field of magnetic field measurement, concretely relates to long coil magnetic survey machine of dipolar magnet translation.
Background
The long coil magnetic measuring device is mainly used for measuring the field error of the dipolar magnet and is used for measuring the field quality of the dipolar magnet. At present, an independent machine tool type long coil magnetism measuring device is developed by the institute of high-energy physics of Chinese academy of sciences, and the measuring principle is that a n-shaped frame is installed on a bed body similar to a machine tool, and a cross beam wound with a long rectangular coil is arranged at the forefront of the n-shaped frame.
However, the existing independent machine tool type long coil magnetic measuring device has strong universality and high cost. When the device is used for measuring the H-shaped long-bending dipolar magnet, the operation is complex and the collimation is difficult.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a dipolar magnet translation long coil magnetism surveys machine to realize proton dipolar magnet's survey magnetism.
In order to achieve the purpose, the utility model provides a dipolar magnet translation long coil magnetic testing machine, which comprises a bracket, a coil bracket and a coil framework which are arranged from bottom to top in sequence, wherein a coil is wound on the convex coil framework, the upper surface of the coil bracket is processed into a groove, and the coil, the coil bracket and the coil framework are combined to form a coil bracket; the coil support is placed on the central line of the upper surface of the bracket and can slide along the directions of two sides of the central line of the upper surface of the bracket, two ends of the coil support are respectively fixed on the two linear motion platforms, and the coil support can move on the upper surface of the bracket by driving the two linear motion platforms so as to cut the magnetic field of the dipolar magnet to obtain a corresponding voltage signal.
The cross-sectional shape of the coil bracket is U-shaped.
The coil bracket is arranged on the central line of the upper surface of the bracket, and the bracket is matched with the magnetic pole side of the dipolar magnet to be detected through the right-angle clamping groove on the lower surface of the bracket.
The cross section of the bracket is H-shaped.
The linear motion platform is provided with a fixed seat and a moving end, the bottom of the coil bracket is connected with the fixed seat of the linear motion platform through a transition plate, and two ends of the coil bracket are connected with the moving end of the linear motion platform.
The linear motion platform comprises a fixed seat, a stepping motor arranged on the fixed seat, a lead screw connected with a motor shaft of the stepping motor, and a nut sleeved on the lead screw and used as a moving end of the linear motion platform, and two ends of the coil support are fixedly connected with the nut.
Two terminals are arranged at two ends of the coil and connected with a signal acquisition device.
The signal acquisition device is a high-precision integrator PDI5025 connected with a computer.
The bracket, the coil bracket and the coil framework all extend along a straight line.
The bracket and the coil bracket both extend along a curve, the coil framework is fixed on the U-shaped reinforcing rib, and the curvature of the coil framework is smaller than that of the coil bracket.
The utility model discloses a coil support of long coil magnetism survey machine of dipolar magnet translation places on the upper surface central line in coil support groove and along central line both sides direction slidable to slip through coil support can be applicable to and measure dipolar magnet, convenient operation, and it is swift simple to measure. Furthermore, the utility model discloses a right angle draw-in groove and the magnetic pole side of the second grade magnet that awaits measuring mutually support to realize putting into of magnetism survey coil and measure, the card just can realize the collimation in place during the installation.
Drawings
Fig. 1 is a schematic structural diagram of a dipolar magnet translation long coil magnetic measuring machine according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of the attitude of the coil in the magnetic field of the dipole magnet.
Fig. 3 is a schematic structural diagram of a dipolar magnet-translating long-coil magnetic measuring machine according to a second embodiment of the present invention.
Figure 4 is the utility model discloses a field error result of putting into type measurement dipolar magnet that dipolar magnet translation long coil magnetism measuring machine realized.
Detailed Description
The utility model discloses a dipolar magnet translation long coil magnetism surveys machine is applicable to proton dipolar magnet's survey magnetism, can be applicable to the H type dipolar magnet of measuring any shape. The shapes of the bracket 10, the coil carrier 20, and the coil bobbin 30 need to be identical to the trajectories of electron beams in a two-pole magnet, in which a portion is curved and the ends are straight. Generally, the pole faces of the dipolar magnets are rectangular and fan-shaped, and the design principle can carry out magnetic measurement on both the direct dipolar magnets with the rectangular pole faces and the bent dipolar magnets with the fan-shaped pole faces.
First embodiment is suitable for a translation long coil magnetic measuring machine of a rectangular dipolar magnet
According to the utility model discloses a long coil magnetic measuring machine of dipolar magnet translation of first embodiment, as shown in fig. 1, the long coil magnetic measuring machine of dipolar magnet translation is the isolated plant of formula of putting into, and it is used for putting into rectangle dipolar magnet, including support groove 10, coil bracket 20 and the coil skeleton 30 that set gradually from bottom to top, the coiling has coil 40 on the convex-type coil skeleton 30, and coil 40, coil bracket 20 and coil skeleton 30 combination have formed the coil support.
The material of the bracket 10, the coil bracket 20 and the coil skeleton 30 is 3240 epoxy laminated glass cloth plate material.
In this embodiment, the bracket 10, the coil carrier 20, and the coil bobbin 30 all extend along a straight line, thereby serving to measure straight line portions in the magnet (i.e., suitable for measuring rectangular dipolar magnets).
The cross-sectional shape of the bracket 10 is H-shaped. The upper side and the lower side of the bracket 10 are similar to two grooves (wherein the groove arranged on one side of the lower surface of the bracket 10 is a right-angle clamping groove), and the coil bracket 20 is placed on the central line of the upper surface of the bracket 10. The bracket 10 is matched with the side edge of the magnetic pole of the dipolar magnet to be detected through the right-angle clamping groove on the lower surface of the bracket 10, so that the bracket 10 is positioned in the horizontal direction relative to the dipolar magnet, and the bracket 10 is fixed on the lower magnetic pole surface of the dipolar magnet to be detected.
The coil bracket 20 has a U-shaped cross section, a groove is formed on the upper surface of the coil bracket, and the convex coil bobbin 30 and the coil 40 wound thereon are fixedly placed in the groove of the coil bracket 20. The coil 40, coil carrier 20 and bobbin 30 thus combine to form a coil support in which the internal components do not move relative to one another.
Two ends of the coil support are respectively fixed on the two linear motion platforms 50, and driving the two linear motion platforms 50 causes the coil support to move on the upper surface of the coil bracket 10, so as to cut the magnetic field of the dipolar magnet and obtain a corresponding voltage signal. The linear motion platform 50 is provided with a fixed seat and a movable end, the bottom of the coil bracket 20 is connected with the fixed seat of the linear motion platform 50 through a transition plate, and two ends of the coil support are connected with the movable end of the linear motion platform 50.
In this embodiment, the linear motion platform 50 includes a fixing base, a stepping motor installed on the fixing base, a lead screw connected to a motor shaft of the stepping motor, and a nut sleeved on the lead screw and serving as a moving end of the linear motion platform 50, and two ends of the coil support are fixedly connected to the nut. The stepping motor rotates the lead screw to drive the coil to move, and the moving distance can be transmitted to a computer by an encoder connected to a motor shaft through a connector.
From this, coil support moves on holding in the palm groove 10, and holds in the palm groove 10 can directly laminate and fix on the lower magnetic pole face of the dipolar magnet that awaits measuring, leans on the magnetic pole side of the dipolar magnet that awaits measuring and the mutually supporting realization location of the right angle draw-in groove of holding in the palm groove 10 in the horizontal direction, therefore need not special collimation process during the survey magnetism. The device has simple structure, low cost and easy realization.
In the present embodiment, the coil 40 is wound by winding a total of 240 turns of 12 turns of each of the 20 flat wires on the bobbin 30. The multiple strands of the coil 40 are serially connected in sequence.
Two terminals are arranged at two ends of the coil 40 and are connected with a signal acquisition device. In this embodiment, the signal acquisition device is a high-precision integrator PDI5025 connected to the computer, so that the electrical signal is acquired by the high-precision integrator PDI5025 and enters the computer.
The utility model discloses a measuring principle of dipolar magnet translation long coil magnetism survey machine does: in the dipolar magnet, dipolar components are absolute large numbers, multipolar components are small numbers, and the small numbers can be accurately measured by removing a large number. The voltage signal induced in the coil moving in the air gap in the transverse direction is only related to the error field and not to the dipolar component, so that it is actually a relative measurement of the magnetic field, which plays an important role in improving the measurement accuracy, and therefore, it is sufficient to select an appropriate moving speed according to the maximum possible deviation value of the magnetic field. The offset value of the magnetic field is determined based on the magnet length (i.e., the winding length of the coil 40), the width of the coil 40, and the number of turns of the coil 40 selected, as well as the measured induced voltage value and the integrated voltage value.
Fig. 2 is a schematic diagram of the posture of the coil 40 in the magnetic field of the dipolar magnet, wherein the x-axis is the radial direction of the dipolar magnet to be measured, and the y-axis is the direction perpendicular to the x-axis and the coil 40. As shown in fig. 2, the integral of the voltage signal induced in a conductor moving in a magnetic field is equal to the magnetic field vector potential, i.e. the real part of the complex magnetic potential F. In an N-order magnetic field, a coil with N turns and a width of 2a translates In the magnetically neutral plane, giving an integral In of the voltage signal per unit length equal to:
In＝N×Re[F x+a -F x-a ]＝N×C n [(x+a) n -(x-a) n ]，n＝2,3,4……
where N is the number of turns of the coil, a is half the width of the coil, and F x+a 、F x-a The complex magnetic potential F values when x-direction coordinates are x + a and x-a, re represents a real number part, cn is a high-order field coefficient, n is an order, and n =1,2,3,4,5 \8230.
Second embodiment dipolar magnet translation long coil magnetic measuring machine suitable for bending dipolar magnet
As shown in fig. 3, the specific structure of the dipolar magnet translation long coil magnetic measuring machine according to the second embodiment of the present invention is basically the same as the structure of the dipolar magnet translation long coil magnetic measuring machine according to the first embodiment of the present invention, and the differences are only in that:
the bracket 10 and the coil carrier 20 each extend along a curve and are thus used for measuring curved portions in the magnet (i.e. for measuring bent dipole magnets).
In this embodiment, the bobbin 30 is fixed to a U-shaped reinforcing bar, which serves as a coil structure support so that the bobbin 30 can extend along a curved line with a curvature smaller than that of the coil bracket 20. That is, the coil support includes a U-shaped reinforcing bar in addition to the coil 40 and the bobbin 30.
The coil support is placed on the center line of the upper surface of the bracket 10 and is slidable in both side directions of the center line of the upper surface. Two ends of the coil support are respectively fixed on the two linear motion platforms 50, so that the linear motion platforms 50 can drive the coil support to move on the upper surface of the bracket 10, and the magnetic field of the dipolar magnet is cut to obtain a corresponding voltage signal. It should be noted that, in this embodiment, the driving coil support or the linear motion platform 50 is connected to the embodiment, and the motion trajectory is also linear, and only the curved coil is used to cut the magnetic lines of force.
The utility model discloses a dipolar magnet translation long coil magnetic measuring machine's coil carrier is placed on the upper surface central line in coil support groove and along central line both sides direction slidable, measures dipolar magnet through coil carrier's slip, convenient operation, and it is swift simple to measure. Furthermore, the utility model discloses a lower extreme right angle draw-in groove in support groove mutually supports with the magnetic pole side of the second grade magnet that awaits measuring to realize putting into of magnetism survey coil and measure, make the collimation of realizing more easily during the installation.
Based on the above dipolar magnet translation long coil magnetic measurement machine, the realized dipolar magnet translation long coil magnetic measurement method comprises the following steps:
step S1: and (3) building the dipolar magnet translation long coil magnetic measuring machine and installing the dipolar magnet translation long coil magnetic measuring machine on the dipolar magnet to be measured.
Wherein the measurement is performed under the magnetic field of several physically specified dipolar magnets to be measured.
Step S2: adjusting the excitation current of the dipolar magnet to be tested to the test current position for stabilization; the value of the test current is the design current of the magnet.
And step S3: during measurement, the signal acquisition device is set to zero;
and step S4: the linear motion platform 50 of the dipolar magnet translation long-coil magnetic measuring machine drives the coil bracket to move at a uniform speed on the designated coordinates of the dipolar magnet to be measured and at equal intervalsThe voltage of the coil 40 in the coil support is sampled and integrated to determine the voltage integral value function Δ ^ B y dl = f (x), where x is the coordinate of the radial direction of the dipole magnet, B y The magnetic field in the vertical direction in the gap of the two-pole magnet, and l is the length of the long coil; integral voltage value function Δ £ jeq B y dl is the voltage integral obtained by translation of the long coil.
Wherein, the appointed coordinate on the dipolar magnet to be measured passes through the initial end in the radial direction of the dipolar magnet (the coordinate X in the radial direction of the dipolar magnet is the coordinate X of the initial end) min ) To the end (coordinate X of radial direction of its dipole magnet = coordinate X of the end max ) And returning to the initial end path, and taking a coordinate as a designated coordinate at a fixed sampling distance interval. In the present embodiment, the coordinate X of the initial end min Is-60 mm, and the coordinate X of the tail end max 60mm, and a fixed sampling distance of 2mm, i.e. from the coordinate X of the dipole magnet min ＝-60mm→ 0→X max ＝60mm→0→X min The voltage is sampled by taking one coordinate per 2mm of movement as a specified coordinate for the movement of-60 mm. The coil support is stationary in the y-axis (i.e., the radial direction of the dipole magnet) as it moves in the x-axis, and induces substantially no voltage, if any, because the y-axis is aligned with the magnetic field lines.
Specifically, the voltage sampling value is converted and counted by the voltage frequency of the high-precision integrator PDI5025 to obtain an integral value, which is sent to the computer, so that the voltage integral value function Δ ^ B y dl＝f(x)。
Step S5: according to the voltage integral value function Delta ^ B y dl = f (x) the magnetic field of the secondary magnet to be measured was evaluated.
Step S5 may include: according to the voltage integral value function Delta ^ B y dl = f (x) gives the evaluation function
Wherein, delta ^ B y dl is the voltage integral value obtained by translation of the long coil, and is the sum of higher harmonics, [ integral ] B y dl is to let the current rise to designAnd evaluating the quality of the integral field of the secondary magnet to be measured by utilizing an evaluation function according to the dipolar magnet fundamental wave integral value obtained in the current process.
Wherein, the voltage integral value function Δ ^ B obtained in step S4 y dl = f (x) as a numerator of the evaluation function.
Further, the step S5 may include: versus voltage integral value function Δ ^ B y dl = f (x) is evaluated for the magnetic field quality by obtaining coefficients of a taylor series as values of harmonic component bn by a least square fitting method (i.e., a field error curve of a dipole magnet is obtained by taylor series fitting) (n in bn is a taylor series corresponding to a component of a 2n pole field, n =2,3,4 \8230;). The value of the harmonic component bn is the multipole component after the elimination of the dipolar component, and the magnetic induction intensity of each level of harmonic and the effective length value L of the magnet can be calculated according to the harmonic component bn eff The product of (a) and (b). The method changes absolute measurement into differential measurement, and amplifies and distinguishes tiny difference of magnetic field by using high-magnification amplifier, thereby improving magnetic field measurement precision.
Further, step S6 may be further included: integral field excitation characteristic function ^ Bydl = f (I) and integral field transfer function ^ By dl/I = f (I) are measured: a coil bracket with a coil 40 is placed at the center (x = y = 0) of the dipolar magnet to be measured and is still, the exciting current of the dipolar magnet is gradually increased from 0 to the maximum value and returns to zero, a plurality of current values I and corresponding integral values obtained by voltage frequency conversion and counting are recorded in the process, and further integral field exciting characteristic function F (I) = ^ integral factor B is obtained y dl, where I is the exciting current of the dipolar magnet, B y The magnetic field in the vertical direction in the gap between the two poles of the magnet, l is the length of the long coil. The function called integral field transfer function characteristic of ^ Bydl/I = f (I) can also be obtained. Effective length of magnet L eff Is an integral signal BL obtained by voltage frequency conversion and counting corresponding to the current value I eff And the magnetic induction signal B is obtained by dividing the magnetic induction signal B obtained by point measurement of the Hall probe.
The experimental results are as follows:
the voltage value that gathers gets into high accuracy integrator PDI5025 reentrant computer, the utility model discloses a field error result that dipolar magnet translation long coil magnetism measuring machine realized imbedding type measurement dipolar magnet is shown in figure 4. The abscissa in fig. 4 has units of mm, and one data point per 2mm can be seen. The quality of the magnetic field can thus be evaluated.
What has been described above is only the preferred embodiment of the present invention, not for limiting the scope of the present invention, but various changes can be made to the above-mentioned embodiment of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present invention fall within the scope of the claims of the present invention. The present invention is not described in detail in the prior art.
Claims (10)
1. A dipolar magnet translation long coil magnetic measuring machine is used for being placed in an dipolar magnet and is characterized by comprising a bracket (10), a coil bracket (20) and a coil framework (30) which are sequentially arranged from bottom to top, wherein a coil (40) is wound on the convex coil framework (30), the upper surface of the coil bracket (20) is processed into a groove, and the coil (40), the coil bracket (20) and the coil framework (30) are combined to form a coil support; the coil support is placed on the central line of the upper surface of the bracket (10) and can slide along the directions of two sides of the central line of the upper surface of the bracket (10), two ends of the coil support are respectively fixed on the two linear motion platforms (50), and the coil support can move on the upper surface of the bracket (10) by driving the two linear motion platforms (50) so as to cut the magnetic field of the dipolar magnet to obtain a corresponding voltage signal.
2. Dipolar magnet-translating long-coil magnetic testing machine according to claim 1, characterized in that the coil carrier (20) is U-shaped in cross-section.
3. The dipolar magnet translation long coil magnetic testing machine of claim 1, characterized in that, the lower surface side of bracket (10) is equipped with the right angle draw-in groove, the coil bracket (20) is placed on the upper surface central line of bracket (10), the bracket (10) mutually cooperates with the magnetic pole side of the dipolar magnet to be tested through the right angle draw-in groove of its lower surface.
4. The dipolar magnet-translating long-coil magnetic measuring machine according to claim 3, characterized in that the cross-sectional shape of the bracket (10) is H-shaped.
5. The dipolar magnet translation long coil magnetic measuring machine according to claim 1, characterized in that the linear motion platform (50) has a fixed seat and a moving end, the bottom of the coil bracket (20) is connected with the fixed seat of the linear motion platform (50) through a transition plate, and both ends of the coil support are connected with the moving end of the linear motion platform (50).
6. The dipolar magnet translation long coil magnetic measurement machine according to claim 5, characterized in that the linear motion platform (50) comprises a fixed seat, a stepping motor installed on the fixed seat, a lead screw connected with a motor shaft of the stepping motor, and a nut sleeved on the lead screw and used as a moving end of the linear motion platform (50), and two ends of the coil support are fixedly connected with the nut.
7. The dipolar magnet-translating long-coil magnetic measuring machine according to claim 1, characterized in that the coil (40) has two terminals at both ends, which are connected with a signal acquisition device.
8. The dipolar magnet-translating long-coil magnetic testing machine according to claim 7, wherein the signal acquisition device is a high precision integrator PDI5025 connected to a computer.
9. The dipolar magnet-translating long-coil magnetic measuring machine according to claim 1, wherein the bracket (10), coil carrier (20), and coil former (30) all extend along a straight line.
10. The dipolar magnet-translating long-coil magnetic testing machine according to claim 1, characterized in that the bracket (10) and the coil carrier (20) each extend along a curve, the coil bobbin (30) being fixed on a U-shaped reinforcing bar, the coil bobbin (30) having a curvature smaller than the curvature of the coil carrier (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221812995.8U CN218003695U (en) | 2022-07-14 | 2022-07-14 | Dipolar magnet translation long coil magnetic measuring machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221812995.8U CN218003695U (en) | 2022-07-14 | 2022-07-14 | Dipolar magnet translation long coil magnetic measuring machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218003695U true CN218003695U (en) | 2022-12-09 |
Family
ID=84313817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221812995.8U Active CN218003695U (en) | 2022-07-14 | 2022-07-14 | Dipolar magnet translation long coil magnetic measuring machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218003695U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116973672A (en) * | 2023-09-25 | 2023-10-31 | 合肥航太电物理技术有限公司 | Low-level scanning current testing device and testing method thereof |
-
2022
- 2022-07-14 CN CN202221812995.8U patent/CN218003695U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116973672A (en) * | 2023-09-25 | 2023-10-31 | 合肥航太电物理技术有限公司 | Low-level scanning current testing device and testing method thereof |
| CN116973672B (en) * | 2023-09-25 | 2023-12-29 | 合肥航太电物理技术有限公司 | Low-level scanning current testing device and testing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2390991B1 (en) | Mover and linear motor | |
| CN218003695U (en) | Dipolar magnet translation long coil magnetic measuring machine | |
| Walckiers | Magnetic measurement with coils and wires | |
| CN109061531B (en) | System and method for testing rotating magnetic characteristics of large sample wafer by considering eddy current influence | |
| CN104122516A (en) | Electrical sheet steel magnetostriction measurement system and method | |
| CN111308404B (en) | Two-dimensional magnetic characteristic measuring device under three-dimensional stress loading condition | |
| CN211122663U (en) | Magnetization element for nondestructive testing sensor and sensor | |
| US20040207391A1 (en) | Equipment for measuring displacement | |
| CN103630746A (en) | Method for measuring and assessing alternating-current resistance of windings of magnetic elements with air gaps | |
| CN108333537B (en) | Debugging device and method for tubular sensor for magnetic field test | |
| DE50213062D1 (en) | Ferraris-sensor | |
| CN114384449B (en) | Three-dimensional space vector magnetism measuring device and method | |
| Yang et al. | Magnetic field measurement for synchrotron dipole magnets of heavy-ion therapy facility in Lanzhou | |
| CN110531288A (en) | A kind of epstein frame magnetic property detection device and method | |
| JPH0837772A (en) | Linear motor | |
| Billan et al. | Geometry and remanent field series measurement of the LEP dipole magnets | |
| Thern | Bending magnets for the CBA beam transport line | |
| Zhang et al. | The main dipole magnets design and test of HIMM project | |
| CN217981798U (en) | Magnetic moment measuring equipment for rare earth permanent magnet sintered neodymium iron boron | |
| CN115882749B (en) | Magnetic suspension driving device of grating ruler | |
| CN114362618B (en) | Method for calibrating initial phase angle of rotor current of permanent magnet synchronous motor | |
| CN211122662U (en) | Support for magnetic resistance element of nondestructive testing sensor and sensor | |
| Billan et al. | Field display system for the forecast of beam momentum and betatron frequencies in LEP | |
| Hirayama et al. | Experimental Characterization of Linear Switched Reluctance Motor for Physical Distribution Conveyance System | |
| JPH09280807A (en) | Size measuring instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |