CN203759233U - Device for measuring temperature coefficient of permanent magnet in open-circuit manner - Google Patents
Device for measuring temperature coefficient of permanent magnet in open-circuit manner Download PDFInfo
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- CN203759233U CN203759233U CN201420115216.8U CN201420115216U CN203759233U CN 203759233 U CN203759233 U CN 203759233U CN 201420115216 U CN201420115216 U CN 201420115216U CN 203759233 U CN203759233 U CN 203759233U
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Abstract
The utility model relates to a device for measuring the temperature coefficient of a permanent magnet in an open-circuit manner. The device comprises a balance support, the balance support includes a box, a rack is placed on the inner bottom of the box, a uniform gradient field generator is placed on the rack, and connected with a current-constant power supply, and a high temperature furnace is placed on the uniform gradient field generator or on the rack by passing through the uniform gradient field generator, and connected with a temperature control unit; and an assay balance is placed on the top of the balance support, and connected with a computer, the computer is connected with the temperature control unit, a sample suspension rope is fixed at the lower end of the assay balance, and extends into the high temperature furnace by passing through the top surface of the balance support, the tail end of the sample suspension rope is connected with a sample sleeve, and a sample to be measured is placed in the sample sleeve. According to the utility model, the problem that present temperature coefficient measurement for the permanent magnet is low in precision and resolution is effectively solved, and methods and means are provided measurement of key materials in the aerospace field.
Description
Technical field
The utility model relates to permanent magnet material temperature coefficient field of measuring technique, relates in particular to a kind of permanent magnet temperature coefficient open circuit measurement mechanism.
Background technology
In permanent magnet material field, some have the permanent magnet of special applications, as the material of rare earth permanent magnet as critical components such as airship, aircraft, are widely used in Aero-Space, national defence field, and its magnetic property directly affects related-art technology level.Due to accuracy, safety and reliability, the magnetic property that above field requires permanent magnetic material is variation with temperature and fluctuating not, and airship, aircraft etc. must use the permanent magnetic material of ultralow temperature coefficient.Therefore, accurately measuring of permanent magnetic material temperature coefficient become to particularly important.
At present, the method for measuring permanent magnetic material temperature coefficient in prior art has closed magnetic circuit scanning method, and its Measurement Resolution is 10
-4/ ℃, along with the research of ultralow temperature coefficient permanent magnetic material and application are to 10
-5/ ℃ order of magnitude strides forward, and existing measurement means can not meet measurement requirement, and the research of relevant ultralow temperature coefficient measuring method aspect does not have open source literature yet.Domestic, the measuring method of ultralow temperature temperature coefficient permanent magnetic material seriously lags behind the progress of material.Further reduction along with permanent magnetic material temperature coefficient, measuring method and measuring equipment lack, and this measuring technique is taked to the policy that is kept absolutely secret and embargos abroad, limited deeply carrying out of ultralow temperature coefficient permanent magnetic material research, the application level of rare earth permanent-magnetic material in these fields cannot obtain and continue to promote.
Current measuring method adopts the method for directly measuring magnetic property, and owing to being subject to the restriction of measuring principle and surveying instrument, resolution is difficult to reach requirement.
Utility model content
Technical problem to be solved in the utility model is for the deficiencies in the prior art, and a kind of permanent magnet temperature coefficient open circuit measurement mechanism is provided, and greatly improves permanent magnet temperature coefficient measuring accuracy and resolution.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of permanent magnet temperature coefficient open circuit measurement mechanism, comprises balance support, stand, uniform gradient field generating means, constant-current supply, high temperature furnace, temperature conditioning unit, analytical balance, computing machine, sample suspension line, Sample sleeve and sample;
Described balance support is a casing, its inner bottom part is placed a stand, on described stand, place uniform gradient field generating means, described uniform gradient field generating means is connected with constant-current supply, described high temperature furnace is placed on the generating means of uniform gradient field or through uniform gradient field generating means and is placed on stand, and described high temperature furnace is connected with the temperature conditioning unit outside balance support;
An analytical balance is placed at the top of described balance support, described analytical balance is connected with computing machine by wire, described computing machine is also connected with temperature conditioning unit, a sample suspension line is fixed in described analytical balance lower end, described sample suspension line extends to high temperature furnace inside through the end face of balance support, described sample suspension line end connects a Sample sleeve, places sample in described Sample sleeve.
The beneficial effects of the utility model are: the utility model utilizes uniform gradient generating means to produce the uniform gradient field of high stability, and gradient fields is vertical direction, guarantee that sample is only subject to the power of vertical direction, temperature conditioning unit heats high temperature furnace, and then utilize analytical balance to measure the stressing conditions of sample under different temperatures, and then calculate temperature coefficient according to computing formula, the utility model is converted to magnetic signal the mode of force signal, realizing highly sensitive temperature coefficient measures, and the stability of constant-current supply is high, thereby determined the high stability of gradient fields, the utility model efficiently solves current ultralow temperature coefficient permanent magnetic material temperature coefficient measuring accuracy and the low problem of resolution, measurement supplying method and means for the critical material of aerospace field, promote rare earth permanent-magnetic material in the lifting of the application level in these fields.
On the basis of technique scheme, the utility model can also be done following improvement.
Further, described uniform gradient field generating means adopts solenoid type generating means or electromagnet type generating means.
Further, described solenoid type generating means comprises urceolus, bottom plate, upper head plate, stay pipe, the first coil, the first water-cooled layer, upper gasket and lower gasket; Described urceolus, bottom plate and upper head plate are fixed together and form a upper and lower tubular structure with cover, described upper head plate and bottom plate core respectively leave a through hole, described stay pipe is fixed on urceolus center, described stay pipe outer wall comprises several steps from the bottom to top, described the first coil is wrapped on stay pipe, the outer wall of described the first coil form one level and smooth cylindric; Described the first water-cooled layer is arranged between the first coil and urceolus; Between described the first coil top and upper head plate, be provided with upper gasket, between described the first coil bottom and bottom plate, be provided with lower gasket.
Further, described electromagnet type generating means comprises base plate, outer sleeve, upper cartridge, lower cartridge, the second coil, the second water-cooled layer and packing ring; Described base plate is circular bottom plate, and described outer sleeve is fixed on base plate plate, leaves the lid-like of through hole centered by upper cartridge, is fixed on outer sleeve, and described upper cartridge inwall is the projection with certain radian; Described lower cartridge is the right cylinder that top has certain radian projection, and lower cartridge is fixed on base plate, and described the second coil is enclosed within on lower cartridge; Described the second water-cooled layer is layered in the aspect of lower cartridge and the second coil composition; Described packing ring is placed on the second water-cooled layer, and end face contacts with the lower surface of upper cartridge.
Further, technique scheme also comprises water cooling plant, and described water cooling plant is connected with the water-cooled layer in the generating means of uniform gradient field.
Further, described high temperature furnace comprises the bell of body of heater and seal flange, described body of heater comprises protective cover layer, heat-insulation layer, zone of heating from outside to inside, described zone of heating is wound around crucible by bifilar high-temperature insulation heating tape and forms, described body of heater inside arranges thermometric thermal resistance and snorkel, described thermometric thermal resistance and snorkel all extend to outside body of heater through the center pit of bell, and at the outside port of snorkel, an operation valve are set; The protective cover layer outside of described body of heater is provided with a pair of handle.
Adopt the beneficial effect of above-mentioned further scheme: the zone of heating of high temperature furnace is wound around crucible by bifilar high-temperature insulation heating tape and forms, and bifilar helix can effectively be eliminated the magnetic field that electric current causes; Heat-insulation layer can be maintained temperature in stove; In stove, arrange thermometric thermal resistance can Real-time Obtaining stove in actual temperature, and send temperature conditioning unit to, obtain in time the temperature conditions of required sample; Snorkel is set in stove, by snorkel, in stove, passes into nitrogen, in order to avoid sample is oxidized too for a long time because of the heat time; Protective cover layer outer setting handle, convenient carrying.
Further, described protective cover layer adopts polytetrafluoroethylmaterial material, and the crucible of described zone of heating adopts quartz material.
Adopt the beneficial effect of above-mentioned further scheme: adopt nonmetally, avoid the impact in metal pair magnetic field.
Accompanying drawing explanation
Fig. 1 is the cut-open view of a kind of permanent magnet temperature coefficient open circuit measurement mechanism described in the utility model embodiment 1;
Fig. 2 is the cut-open view of a kind of permanent magnet temperature coefficient open circuit measurement mechanism described in the utility model embodiment 2;
Fig. 3 is solenoid type generating means cut-open view described in the utility model;
Fig. 4 is electromagnet type generating means cut-open view described in the utility model;
Fig. 5 is the cut-open view of high temperature furnace described in the utility model.
In accompanying drawing, the list of parts of each label representative is as follows:
1, balance support, 2, stand, 3, uniform gradient field generating means, 4, constant-current supply, 5, high temperature furnace, 6, temperature conditioning unit, 7, analytical balance, 8, computing machine, 9, sample suspension line, 10, Sample sleeve, 11, sample, 12, water cooling plant, 5-1, body of heater, 5-2, bell, 5-3, thermometric thermal resistance, 5-4, snorkel, 5-5, handle, 5-1-1, protective cover layer, 5-1-2, heat-insulation layer, 5-1-3, zone of heating, 301, urceolus, 302, bottom plate, 303, upper head plate, 304, stay pipe, 305, the first coil, 306, the first water-cooled layer, 307, upper gasket, 308, lower gasket, 311, base plate, 312, outer sleeve, 313, upper cartridge, 314, lower cartridge, 315, the second coil, 316, the second water-cooled layer, 317, packing ring, 318, hex screw.
Embodiment
Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
Measuring method and the surveying instrument of the crucial magnetic material that the utility model is badly in need of for Aero-Space, national defence field, realize 10
-5the measurement of the ultralow temperature coefficient permanent magnetic material temperature coefficient of/℃ order of magnitude.
The utility model proposes the mode that changes magnetic signal into force signal realizes highly sensitive temperature coefficient and measures.The force bearing formulae of the atom with magnetic moment in nonuniform field is:
Wherein,
for Grad; F: stressed (g) of sample in magnetic field; F
z: sample stressed (g) in the vertical direction; m
zfor magnetic moment.
According to formula (1), when the permanent magnetic material sample of solid shape is put into a gradient magnetic, permanent magnet is by being subject to a power consistent with gradient fields direction, and when gradient fields is a constant, the size of acting force is directly proportional to the magnetic moment of sample.Because permanent magnet exists temperature coefficient, its magnetic moment size can change along with the variation of temperature, so, can obtain the temperature coefficient of sample by measuring the stressed size of sample under different temperatures, and concrete mathematical model is:
Wherein, α (B
r): temperature coefficient, unit be %/℃.
T
1: basal temperature, unit is ℃.
T
2: the ceiling temperature of temperature variation, unit is ℃.
F(T
1): temperature T
1time sample stressed, unit is g.
F(T
2): temperature T
2time sample stressed, unit is g.
Because force measurement precision depends on the measuring accuracy of balance, so select high-precision analytical balance can improve accuracy of measurement.Therefore, the utility model proposes and adopt the mode that magnetic signal is converted to force signal, realize highly sensitive temperature coefficient and measure.
The cut-open view of temperature coefficient open circuit measurement mechanism when Fig. 1 is gradient field generator employing solenoid type generating means, the cut-open view of temperature coefficient open circuit measurement mechanism when Fig. 2 is gradient field generator employing electromagnet type generating means, as shown in Figure 1, 2, a permanent magnet temperature coefficient open circuit measurement mechanism, comprises balance support 1, stand 2, gradient field generator 3, constant-current supply 4, high temperature furnace 5, temperature conditioning unit 6, analytical balance 7, computing machine 8, sample suspension line 9, Sample sleeve 10 and sample 11; Described balance support 1 is a casing, its inner bottom part is placed a stand 2, on described stand, place uniform gradient field generating means 3, described uniform gradient field generating means 3 is connected with constant-current supply 4, described high temperature furnace 5 is placed on uniform gradient field generating means 3 or through uniform gradient field generating means and is placed on stand 2, and described high temperature furnace 5 is connected with the temperature conditioning unit 6 outside balance support 1;
An analytical balance 7 is placed at the top of described balance support 1, described analytical balance 7 is connected with computing machine 8 by wire, described computing machine 8 is also connected with temperature conditioning unit 6, a sample suspension line 9 is fixed in described analytical balance 7 lower ends, described sample suspension line 9 extends to high temperature furnace 5 inside through the end face of balance support 1, described sample suspension line 9 ends connect a Sample sleeve 10, place sample 11 in described Sample sleeve.
Wherein, described uniform gradient field generating means 3 adopts solenoid type generating means or electromagnet type generating means.
As shown in Figure 3, described solenoid type generating means comprises urceolus 301, bottom plate 302, upper head plate 303, stay pipe 304, the first coil 305, the first water-cooled layer 306, upper gasket 307 and lower gasket 308; Described urceolus 301, bottom plate 302 and upper head plate 303 are fixed together and form a upper and lower tubular structure with cover, described upper head plate 303 and bottom plate 302 cores respectively leave a through hole, described stay pipe 304 is fixed on urceolus 301 centers, described stay pipe 304 outer walls comprise several steps from the bottom to top, described the first coil 305 is wrapped on stay pipe 304, the outer wall of described the first coil 305 form one level and smooth cylindric; Described the first water-cooled layer 306 is arranged between the first coil 305 and urceolus 301; Between described the first coil 305 tops and upper head plate 303, be provided with upper gasket 307, between described the first coil 305 bottoms and bottom plate 302, be provided with lower gasket 308.
In the utility model, field coil is formed by the solenoid combination of four different-diameters and length.For each independent solenoid coil, its height central spot magnetic field intensity is the strongest, near opening part, along the magnetic field intensity of central shaft, reduces gradually, after leaving coil aperture, weakens soon.Four different solenoidal magnetic fields superpose in space, form gradient fields.In the utility model, by strict simulation calculation and optimization to each solenoid length and diameter, in perform region, having obtained the best gradient fields of homogeneity, the size in magnetic field is determined by solenoidal size and coil winding.
As shown in Figure 4, described electromagnet type generating means comprises base plate 311, outer sleeve 312, upper cartridge 313, lower cartridge 314, the second coil 315, the second water-cooled layer 316 and packing ring 317; Described base plate 311 is circular bottom plate, and described outer sleeve 312 is fixed on base plate 311, leaves the lid-like of through hole centered by upper cartridge 313, is fixed on outer sleeve 312, and described upper cartridge 313 inwalls are the projection with certain radian; Described lower cartridge 314 has the right cylinder of certain radian projection for top, and lower cartridge 314 is fixed on base plate 311, and described the second coil 315 is enclosed within on lower cartridge; Described the second water-cooled layer 316 is layered in the aspect of lower cartridge 314 and the second coil 315 compositions; Described packing ring 317 is placed on the second water-cooled layer 316, and end face contacts with the lower surface of upper cartridge 313.Described base plate 311 and outer sleeve 312, base plate 311 and lower cartridge 314, be used for lowering the temperature to coil by the fixing described water-cooled layer of hex screw 318 between upper cartridge 313 and outer sleeve 312, prevent its in the course of the work excess Temperature cause magnetic field unstable.Wherein, technique scheme also comprises water cooling plant 12, and described water cooling plant 12 is connected with the water-cooled layer in uniform gradient field generating means 3, for lowering the temperature to coil.
When magnetic field enters air from ferrimagnet, in close interfacial air one side, magnetic direction is always vertical with interphase.In the utility model, by designing the shape of upper and lower cartridge, make the magnetic line of force to upper cartridge, present divergent state from lower cartridge, thereby produce approximate gradient magnetic in the finite space of cartridge inside, and by cartridge edge is reasonably had a snack, improve the homogeneity of magnetic field gradient.
As shown in Figure 5,6, it is symmetrical along central axis that the magnetic field distribution of described solenoid type gradient field generator and electromagnet type gradient field generator is horizontal direction, and magnetic field is very little, guarantee sample stressed be in the horizontal direction zero.The magnetic field intensity of vertical direction is along central axis distribution gradient, and sample is only received the power of vertical direction.
The major advantage of the design of this gradient fields is the excitation consumption that has reduced inoperative region, and the magnetic field of perform region and magnetic field gradient are greatly improved.
Below critical component in this device is introduced as follows.
1) uniform gradient field generating means 3.
It for generation of Grad, is the gradient fields of a constant, requiring Grad is a constant, except vertical direction is uniform gradient, to guarantee that 11 of samples are subject to outside the power of vertical direction, the stressed of horizontal direction is zero, guarantee sample 11 is in steady state (SS) like this, and the variation of the power recording only reflects that the magnetic property that temperature variation causes changes.
2) constant-current supply 4.
Constant-current supply 4 is 3 power supplies of uniform gradient field generating means, and uniform gradient field generating means 3 produces magnetic field, so the stability of constant-current supply 5 has determined the stability of the gradient fields of generation.If once required the every variation of the temperature of sample 11, the resolution of temperature coefficient reaches 100,000/, the stability of gradient fields just must be less than 100,000/, even less.The long-time stability of constant-current supply depend primarily on temperature drift, the constant-current supply temperature drift that measurement mechanism uses is less than 10ppm/ ℃, under this technical indicator, when variation of ambient temperature is during ± 1 ℃ of scope, the long-term stability of constant-current supply is less than 20ppm/2h, can guarantee every variation 10 degree of the temperature of sample 11, the resolution of temperature coefficient is less than 100,000/.
3) high temperature furnace 5.
As shown in Figure 7; described high temperature furnace 5 comprises body of heater 5-1 and bell 5-2; described body of heater 5-1 comprises protective cover layer 5-1-1, heat-insulation layer 5-1-2, zone of heating 5-1-3 from outside to inside; described zone of heating 5-1-3 is wound around crucible by bifilar high-temperature insulation heating tape and forms; described body of heater 5-1 inside arranges thermometric thermal resistance 5-3 and snorkel 5-4; described thermometric thermal resistance 5-3 and snorkel 5-4 all extend to outside body of heater 5-1 through the center pit of bell 5-2, and at the outside port of snorkel 5-4, an operation valve are set.
Wherein, the protective cover layer 5-1-1 outside of described body of heater 5-1 is provided with a pair of handle 5-5, and described bell 5-2 adopts seal flange.
Wherein, described protective cover layer 5-1-1 adopts polytetrafluoroethylmaterial material, and the crucible of described zone of heating 5-1-3 adopts quartz material.
During high temperature furnace 5 work, require to produce stray magnetic field, sample 11 is exerted an influence avoiding.Therefore zone of heating 5-1-3 adopts the bifilar high-temperature insulation of import heating tape to be wound around silica crucible; and then heat; bipitch can effectively be eliminated the magnetic field that electric current causes; and protective cover layer 5-1-1 adopts teflon; the crucible of zone of heating 5-1-3 adopts quartz ampoule, has effectively avoided the impact in metal pair magnetic field.
4) analytical balance 7.
It is for measuring stressed at gradient magnetic of sample 11.In formula (1), when Grad is a constant, the variation of sample magnetic moment be converted to sample 11 in gradient fields the variation of stressed F.Therefore in measurement mechanism, as long as select the analytical balance 7 of suitable accuracy, full scale 80g for example, resolution 0.01mg, when stressed size is 10g, has just reached millionth resolution.The selection therefore with the high accuracy analysis balance of reasonable range is to guarantee one of key of low-temperature coefficient Materials Measurement high resolution.
Introduce the implementation procedure that permanent magnet temperature coefficient open circuit described in the utility model is measured below.
Step 1: sample is put into the Sample sleeve of measurement mechanism, and be hanging to analytical balance bottom by sample suspension line;
Step 2: constant-current supply sends exciting current signal to uniform gradient field generating means, uniform gradient field generating means produces the uniform gradient fields of Grad, and sample is in gradient fields;
Step 3: computing machine is that high temperature furnace heats by controlling temperature conditioning unit, and the actual temperature in Real-time Obtaining high temperature furnace;
Step 4: heating a period of time, when the real time temperature obtaining when temperature conditioning unit reaches the first predetermined temperature T1, computing machine obtains the now reading F (T1) of analytical balance;
Step 5: computing machine is adjusted temperature to new measurement temperature T 2 interior in high temperature furnace by temperature conditioning unit, and record the reading F (T2) of analytical balance at this measurement temperature;
Step 6: computing machine calculates the temperature coefficient α (B of permanent magnet according to following formula
r),
Wherein, α (B
r) be temperature coefficient, unit be %/℃, T
1for basal temperature, unit is ℃, T
2for the ceiling temperature of temperature variation, unit is ℃, F (T
1) be temperature T
1time sample stressed, unit is g, F (T
2) be temperature T
2time sample stressed, unit is g.
Wherein, step 3 Computer is high temperature furnace 5 heating by controlling temperature conditioning unit 6, and the specific implementation of the actual temperature in Real-time Obtaining high temperature furnace 5 is: the bifilar high-temperature insulation heating tape heating of the zone of heating 5-1-3 of 6 pairs of high temperature furnaces 5 of temperature conditioning unit, but reaching default measurement temperature will be through a process, so measure the real time temperature in stove by thermometric thermal resistance 5-3, and send temperature conditioning unit 6 to.
Described computing machine 8 is realized control, data acquisition and the computing function to analytical balance 7 and temperature conditioning unit 6 by RS232 serial ports.
Wherein, in whole test process, by snorkel 5-4, constantly in high temperature furnace 5, pass into nitrogen.
The utility model proposes the mode that magnetic signal is converted to force signal, realizing highly sensitive temperature coefficient measures, and realization of the present utility model needs the uniform gradient field of high stability, and gradient direction is vertical direction, guarantee that sample is only subject to the power of vertical direction, the magnetic field equal and opposite in direction of horizontal all directions, opposite direction, therefore stressed counteracting is zero; The stability of constant-current supply is high, thereby has determined the high stability of gradient fields, and non-magnetic material is used in the designing requirement of temperature conditioning unit, and heater strip can not produce magnetic field.
According to gradient field generator, use solenoid type or electromagnet type, determine whether described step centre arranges projection, stand centre corresponding to electromagnet type is without projection, there is projection in the stand centre that solenoid type is corresponding, this projection is used for placing high temperature furnace, makes sample in gradient fields.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (7)
1. permanent magnet temperature coefficient open circuit measurement mechanism, it is characterized in that, comprise balance support (1), stand (2), uniform gradient field generating means (3), constant-current supply (4), high temperature furnace (5), temperature conditioning unit (6), analytical balance (7), computing machine (8), sample suspension line (9), Sample sleeve (10) and sample (11);
Described balance support (1) is a casing, its inner bottom part is placed a stand (2), on described stand, place uniform gradient field generating means (3), described uniform gradient field generating means (3) is connected with constant-current supply (4), described high temperature furnace (5) is placed on uniform gradient field generating means (3) above or is placed on stand (2) through uniform gradient field generating means upper, and described high temperature furnace (5) temperature conditioning unit (6) outer with balance support (1) is connected;
An analytical balance (7) is placed at the top of described balance support (1), described analytical balance (7) is connected with computing machine (8) by wire, described computing machine (8) is also connected with temperature conditioning unit (6), a sample suspension line (9) is fixed in described analytical balance (7) lower end, described sample suspension line (9) extends to high temperature furnace (5) inside through the end face of balance support (1), described sample suspension line (9) end connects a Sample sleeve (10), places sample (11) in described Sample sleeve.
2. a kind of permanent magnet temperature coefficient open circuit measurement mechanism according to claim 1, is characterized in that, described uniform gradient field generating means (3) adopts solenoid type generating means or electromagnet type generating means.
3. a kind of permanent magnet temperature coefficient open circuit measurement mechanism according to claim 2, it is characterized in that, described solenoid type generating means comprises urceolus (301), bottom plate (302), upper head plate (303), stay pipe (304), the first coil (305), the first water-cooled layer (306), upper gasket (307) and lower gasket (308); Described urceolus (301), bottom plate (302) and upper head plate (303) are fixed together and form a upper and lower tubular structure with cover, described upper head plate (303) and bottom plate (302) core respectively leave a through hole, described stay pipe (304) is fixed on urceolus (301) center, described stay pipe (304) outer wall comprises several steps from the bottom to top, it is upper that described the first coil (305) is wrapped in stay pipe (304), the outer wall of described the first coil (305) form one level and smooth cylindric; Described the first water-cooled layer (306) is arranged between the first coil (305) and urceolus (301); Between described the first coil (305) top and upper head plate (303), be provided with upper gasket (307), between described the first coil (305) bottom and bottom plate (302), be provided with lower gasket (308).
4. a kind of permanent magnet temperature coefficient open circuit measurement mechanism according to claim 2, it is characterized in that, described electromagnet type generating means comprises base plate (311), outer sleeve (312), upper cartridge (313), lower cartridge (314), the second coil (315), the second water-cooled layer (316) and packing ring (317); Described base plate (311) is circular bottom plate, described outer sleeve (312) is fixed on base plate (311), centered by upper cartridge (313), leave the lid-like of through hole, be fixed on outer sleeve (312) upper, described upper cartridge (313) inwall is the projection with certain radian; Described lower cartridge (314) has the right cylinder of certain radian projection for top, and it is upper that lower cartridge (314) is fixed on base plate (311), and described the second coil (315) is enclosed within on lower cartridge; Described the second water-cooled layer (316) is layered in the aspect of lower cartridge (314) and the second coil (315) composition; It is upper that described packing ring (317) is placed on the second water-cooled layer (316), and its end face contacts with the lower surface of upper cartridge (313).
5. according to a kind of permanent magnet temperature coefficient open circuit measurement mechanism described in claim 3 or 4, it is characterized in that, also comprise water cooling plant (12), described water cooling plant (12) is connected with the water-cooled layer in uniform gradient field generating means (3).
6. a kind of permanent magnet temperature coefficient open circuit measurement mechanism according to claim 1, it is characterized in that, described high temperature furnace (5) comprises the bell (5-2) of body of heater (5-1) and airtight flange, described body of heater (5-1) comprises protective cover layer (5-1-1) from outside to inside, heat-insulation layer (5-1-2), zone of heating (5-1-3), described zone of heating (5-1-3) is wound around crucible by bifilar high-temperature insulation heating tape and forms, described body of heater (5-1) inside arranges thermometric thermal resistance (5-3) and snorkel (5-4), described thermometric thermal resistance (5-3) and snorkel (5-4) all extend to outside body of heater (5-1) through the center pit of bell (5-2), and the outside port at snorkel (5-4) arranges an operation valve, protective cover layer (5-1-1) outside of described body of heater (5-1) is provided with a pair of handle.
7. a kind of permanent magnet temperature coefficient open circuit measurement mechanism according to claim 6, is characterized in that, described protective cover layer (5-1-1) adopts polytetrafluoroethylmaterial material, and the crucible of described zone of heating (5-1-3) adopts quartz material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420115216.8U CN203759233U (en) | 2014-03-13 | 2014-03-13 | Device for measuring temperature coefficient of permanent magnet in open-circuit manner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420115216.8U CN203759233U (en) | 2014-03-13 | 2014-03-13 | Device for measuring temperature coefficient of permanent magnet in open-circuit manner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885009A (en) * | 2014-03-13 | 2014-06-25 | 中国计量科学研究院 | Permanent magnet temperature coefficient open-circuit measuring device and method |
| CN106932740A (en) * | 2015-12-31 | 2017-07-07 | 北京中科三环高技术股份有限公司 | Permanent magnet magnetic flux device for investigating temperature coefficient and method |
-
2014
- 2014-03-13 CN CN201420115216.8U patent/CN203759233U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885009A (en) * | 2014-03-13 | 2014-06-25 | 中国计量科学研究院 | Permanent magnet temperature coefficient open-circuit measuring device and method |
| CN106932740A (en) * | 2015-12-31 | 2017-07-07 | 北京中科三环高技术股份有限公司 | Permanent magnet magnetic flux device for investigating temperature coefficient and method |
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