CN2852507Y - Frequency conversion speed-regulating motor using permanent magnet - Google Patents
Frequency conversion speed-regulating motor using permanent magnet Download PDFInfo
- Publication number
- CN2852507Y CN2852507Y CN 200520091960 CN200520091960U CN2852507Y CN 2852507 Y CN2852507 Y CN 2852507Y CN 200520091960 CN200520091960 CN 200520091960 CN 200520091960 U CN200520091960 U CN 200520091960U CN 2852507 Y CN2852507 Y CN 2852507Y
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- Prior art keywords
- permanent magnet
- rotor
- radial
- speed
- rotor core
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- Expired - Fee Related
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- Motor Or Generator Cooling System (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The utility model relates to a frequency conversion speed-regulating motor using a permanent magnet, which belongs to the technical field a permanent magnet synchronous motor, which comprises a base, a stator, a rotor, a rotating shaft, a end cover and a ventilating device, wherein the ventilating device is formed by the way that fans are arranged in ventilating holes which are arranged on both sides of the lower part of the base. An inner wind path comprises a plurality of radial ventilating channels which are arranged between every two rotor iron cores and a plurality of axial ventilating holes which are arranged in the rotor iron cores along an axial direction. The utility model has the advantage that the ventilation is excellent. When the utility model is operated in low speed, the temperature rise of the rotor achieves a stable standard state and the motor efficiency and the power factor can be increased. The utility model has a variable frequency speed-regulating function and is suitable for the use requirements of a fan load and a pump load.
Description
Technical field
The utility model relates to a kind of permanent magnet synchronous motor, particularly a kind of frequency-conversion and speed-regulation motor that adopts permanent magnet.
Background technology
The existing permanent magnet synchronous motor that is used for blower fan, load of the pumps, when the general VVVF frequency converter open loop that is used for driven induction motor moves, occur the taller anomaly of p-m rotor temperature rise ratio stator temperature rise sometimes, easily cause the Nd-Fe-B permanent magnet demagnetization, electric efficiency descends; Sometimes even also the step-out phenomenon can occur, motor stops operating suddenly.To produce various losses during the motor operation, these losses are transformed into heat, and each parts heating of motor, temperature are raise, and the rising of motor temperature simultaneously also will cause efficient and some other efficiency index to reduce.And permanent magnet motor adopts frequency converter timing, and motor is under the lower-speed state, so just makes the ventilation and heat of original motor relatively more difficult.
The utility model content
In order to solve the problem of above-mentioned existence, the purpose of this utility model is to provide a kind of frequency-conversion and speed-regulation motor that adopts permanent magnet, it is to have improved rotor structure, ventilation unit on the basis of permanent magnet synchronous motor, increase the function of frequency control, made it to be suitable for the requirement of blower fan, load of the pumps use.
The utility model adopts the frequency-conversion and speed-regulation motor of permanent magnet, comprise support, stator, rotor, rotating shaft, end cap and ventilation unit, its ventilation unit is installed fan in the ventilation hole below the support both sides, add the power of number of fans and motor and the speed that slowly runs relevant; Wind path is included in some radial ducts that are provided with between each section rotor core and the some axial ventilation holes that are provided with vertically in rotor core inside in it.The utility model is considered the general cover rotor of frequency control motor and power frequency across-the-line starting motor for reducing manufacturing cost.Rotor places stator interior, rotor core segmentation setting vertically, each intersegmental gap is a radial ducts, every section rotor core upper edge rotating shaft radial permanent magnet body 14 is set evenly tangentially, along rotating shaft tangential permanent magnet body 10 is set evenly radially, one end of tangential permanent magnet body 10 is near rotor, and the other end places between two radial permanent magnet bodies 14, forms U type structure; Form between tangential permanent magnet body 10 and the radial permanent magnet body 14 every the magnetic magnetic bridge, between tangential permanent magnet body 10 in the rotor core and radial permanent magnet body 14, have axial ventilation hole, the radial distance scope of axial ventilation axially bored line and machine shaft axis is: 102mm～180mm, and preferred distance is 140mm～150mm; Evenly be provided with rotor around the rotor core, the cross sectional shape of rotor is rectangle, convex or trapezoidal.For making the permanent magnet that is inlaid in the rotor core not block the wind path of radial ducts, axial location between permanent magnet adopts structure as shown in Figure 2: the permanent magnet axial length is corresponding with the rotor core of segmentation, the post supports of cylindrical or other shapes that the employing non-magnet material is made between permanent magnet.Frequency converter is to increase direct current reactor and AC reactor on universal frequency converter, directly links to each other with motor.Be used for controlling the frequency conversion and the speed-regulating function of motor.
The utility model has the advantages that the well-ventilated, when low-speed running, make rotor temperature rise reach the stability criterion state, improved electric efficiency and power factor, and had the function of frequency control, make it to be suitable for the requirement of blower fan, load of the pumps use.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present utility model,
Fig. 2 is a motor rotor structure schematic diagram of the present utility model,
Fig. 3 is the axial positioning structure schematic diagram between motor rotor inner permanent magnetic body of the present utility model, wherein a be the radial permanent magnet axon to the location structure schematic diagram, b is that the tangential permanent magnet axon is to the location structure schematic diagram;
1 rotating shaft among the figure, 2 outlet boxes, 3 supports, 4 stator cores, 5 rotor cores, 6 stator winding, 7 end caps, 8 bearings, 9 fans, 10 radial permanent magnet bodies, 11 axial ventilation holes, 12 rotor, 13 stator slots, 14 tangential permanent magnet bodies, 15 post supports, 16 radial ducts.
Embodiment
Further narrate content of the present utility model below in conjunction with drawings and Examples:
Integral mechanical structure of the present utility model as shown in Figure 1, comprise support 3, stator, rotor, rotating shaft 1, end cap 7 and ventilation unit, circumferentially be provided with rotor core 5, stator core 4 successively along rotating shaft 1 in support 3, stator winding 6 places the two ends of stator core 4, the two ends of rotating shaft 1 are equipped with bearing 8 near end cap 7, fan 9 is installed in the below of support 3 both sides, add fan 9 the power and the speed that slowly runs of quantity and motor relevant; The interior wind path of motor is included in some radial ducts 16 that are provided with between each section rotor core and the some axial ventilation holes 11 that are provided with vertically in rotor core inside.
In an embodiment: number of fans is each two of every sides in the ventilation unit, rotor places stator interior: as shown in Figure 1, rotor core segmentation setting vertically, each intersegmental gap is a radial ducts 16, wherein the distance between each section rotor core is 10mm, and promptly the radial width of radial ducts 16 is 10mm; As shown in Figure 2, in rotor core 5 upper edge rotating shafts 14 radial permanent magnet bodies 14 are set evenly tangentially, along rotating shaft 14 tangential permanent magnet bodies 10 are set evenly radially, one end of tangential permanent magnet body 10 is near rotor 12, the other end places between two radial permanent magnet bodies 14, form between tangential permanent magnet body 10 and the radial permanent magnet body 14 every the magnetic magnetic bridge, between tangential permanent magnet body 10 in the rotor core 5 and radial permanent magnet body 14, have axial ventilation hole 11, the cross sectional shape of axial ventilation hole 11 is a round rectangle, its rectangle length is 57mm, and width is 26mm; The radial distance scope of the axis of air duct 11 and machine shaft 1 axis is 140mm, and rotor core 5 outsides evenly are provided with rotor 12, and the cross sectional shape of rotor 12 is a rectangle.Fig. 3 is the axial positioning structure schematic diagram between motor rotor inner permanent magnetic body in the present embodiment, and wherein 10 is the tangential permanent magnet body, and 14 is the radial permanent magnet body, and the post supports 15 that adopts non-magnet material to make between permanent magnet is cylindricality.Motor in the course of the work, add the blast effect that fan produces by means of pull-out type, cooling air is after the fresh air inlet of both sides end cap enters motor, portion of air is blown over stator winding end and is entered rear of core, another part then enters the back behind the radial ducts in rotor and stator core, compiles the back and is added the fan extraction by the pull-out type of support bottom.Utilize forced convection to make interior air of machine and air all around carry out the exchange of heat.
The design of permanent magnet synchronous motor ventilation unit of the present utility model: be to realize by the interior wind path that adds fan and improvement motor.Fan 9 is installed in the below of support 3 both sides, and the interior wind path of motor is to be provided with some radial ducts 16 and to be provided with some axial ventilation holes 11 vertically at internal rotor between each section rotor.Motor in the course of the work, add the blast effect that fan produces by means of pull-out type, cooling air is after the fresh air inlet of both sides end cap enters motor, portion of air is blown over stator winding end and is entered rear of core, another part then enters the back behind the radial ducts in rotor and stator core, compiles the back and is added the fan extraction by the pull-out type of support bottom.Utilize forced convection to make interior air of machine and air all around carry out the exchange of heat.The method that the position of axial ventilation hole 11 will take to optimize magnetic circuit and wind path is determined:
(1) obtains pressure head
1) obtains the rotor pressure head
In the formula: u
1, u
2---raceway groove advances, the peripheral speed of outlet, H
T---the rotor pressure head of each several part, ρ---fluid density, H
p-rotor pressure head;
2) add the fan pressure head
H＝zq
2-H
p
In the formula: z------flow resistance, H
p-rotor pressure head, the air quantity of q---flow resistance;
(2) estimated flow
The volume flow that required coolant is total by energy conservation relation, is calculated by following formula
q
v＝∑p
h/c
a/Δτ
a
In the formula: ∑ p
h--the loss that----must be taken away by coolant;
c
a--the specific heat capacity of----coolant; For air, by ordinary circumstance, c
a=1100J/ (m
3. ℃);
Δ τ
a------coolant is by the temperature rise behind the motor;
(3) ask flow resistance (z is local resistance)
The ventilation of this ventilating system is calculated system according to following supposition: a) linear loss very I to ignore; B) fluid of air gap flows into seldom between stator, rotor, so ignore.
(4) calculate
1) estimates used total volume flow
q
v＝∑p
h/c
a/Δτ
a＝1.45m
3/s
2) axial velocity of air-flow
If the axle two ends add the symmetrical expression fan, establish the both sides flow and equate, then
In the formula: the inside and outside footpath of D1, D2---rotor;
3), obtain required aperture area A=5323mm by fluid continuity equation Q=v*A
2
In the formula: Q---the volume flow of fluid, the flowing velocity of v---fluid, the area that A---fluid flows into;
4) add the pressure of fan
H＝ρ(v
2tu
2-v
1tu
1)＝1214.5
In the formula: u
1, u
2--linear velocity at place, the inside and outside footpath of----impeller, v
1tv
2t---the peripheral speed at place, the inside and outside footpath of impeller;
5) pressure head that self had of rotor
By H=zq
2-H
p, obtain H
p
H
p=60.8 (mm water columns)
By
u
1＝4.6m/s
Obtain u
2=10.99m/s
6) determine the position of wind ditch
By
U is by the above-mentioned the 5th in the formula) u in the step
2Substitution,
Obtain D=140mm
The position of axial ventilation hole 11 is gathered the influence of magnetic flux and magnetic leakage factor and is seen attached list 1, (annotate: the D spindle is to the distance of ventilation hole 11 axle center and electrical axis)
JS series three phase induction motor and permanent magnet synchronous motor main performance data of the present utility model contrast see attached list 2.
Subordinate list 1
| D | Magnetic flux | Magnetic leakage factor |
| 102 | 1.137838032 | 1.0885246 |
| 120 | 1.135348458 | 1.08737 |
| 140 | 1.134777828 | 1.0870107 |
| 150 | 1.135645769 | 1.0869453 |
| 160 | 1.141944283 | 1.0891043 |
| 180 | 1.126584848 | 1.083873 |
Subordinate list 2
| Model | Power (kW) | Efficiency eta | Power factor cos | Locked rotor current multiple Ist | Locked-rotor torque multiple Tst | ||||
| Induction machine | Permanent magnetic motor | Asynchronous machine | Permanent magnetic motor | Asynchronous machine | Permanent magnetic motor | Asynchronous machine | Permanent magnetic motor | ||
| 114-4 | 115 | 91.7 | 93.89 | 0.88 | 0.954 | 4.75 | 5.99 | 1.16 | 1.6 |
| 115-4 | 135 | 92.88 | 94.22 | 0.896 | 0.958 | 5.21 | 6.45 | 1.1 | 1.6 |
| 116-4 | 155 | 92.79 | 94.31 | 0.898 | 0.951 | 5.46 | 6.76 | 1.27 | 1.94 |
| 117-4 | 180 | 93.14 | 94.63 | 0.895 | 0.956 | 5.68 | 4.04 | 1.32 | 1.99 |
| 126-4 | 225 | 93.31 | 94.61 | 0.915 | 0.97 | 5.96 | 4.19 | 2.36 | 1.98 |
| 127-4 | 260 | 93.46 | 94.78 | 0.913 | 0.960 | 5.9 | 4.20 | 2.26 | 2.00 |
| 128-4 | 300 | 93.73 | 94.96 | 0.92 | 0.957 | 6.13 | 4.36 | 2.3 | 2.09 |
Claims (5)
1, a kind of frequency-conversion and speed-regulation motor that adopts permanent magnet, comprise support, stator, rotor, rotating shaft, end cap and ventilation unit, it is characterized in that ventilation unit installs fan in the ventilation hole below the support both sides, wind path is included in some radial ducts that are provided with between each section rotor core and the some axial ventilation holes that are provided with vertically in rotor core inside in it.
2, the frequency-conversion and speed-regulation motor of employing permanent magnet according to claim 1 is characterized in that described rotor places stator interior, rotor core segmentation setting vertically, and each intersegmental gap is a radial ducts; Every section rotor core inside tangentially evenly is provided with radial permanent magnet body (14) along rotating shaft, along rotating shaft tangential permanent magnet body (10) is set evenly radially, one end of tangential permanent magnet body (10) is near rotor, the other end places between two radial permanent magnet bodies (14), form between tangential permanent magnet body (10) and the radial permanent magnet body (14) every the magnetic magnetic bridge, between tangential permanent magnet body (10) in the rotor core and radial permanent magnet body (14), have axial ventilation hole, evenly be provided with rotor around the rotor core.
3, the frequency-conversion and speed-regulation motor of employing permanent magnet according to claim 1 and 2 is characterized in that the radial distance scope of described axial ventilation road axis and machine shaft axis is: 102mm～180mm, preferred distance is 140mm～150mm.
4, the frequency-conversion and speed-regulation motor of employing permanent magnet according to claim 1 and 2 is characterized in that the axial length of described permanent magnet is corresponding with the rotor core of segmentation, is provided with post supports between permanent magnet.
5, the frequency-conversion and speed-regulation motor of employing permanent magnet according to claim 1 and 2, the cross sectional shape that it is characterized in that described rotor are rectangle, convex or trapezoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520091960 CN2852507Y (en) | 2005-07-27 | 2005-07-27 | Frequency conversion speed-regulating motor using permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520091960 CN2852507Y (en) | 2005-07-27 | 2005-07-27 | Frequency conversion speed-regulating motor using permanent magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2852507Y true CN2852507Y (en) | 2006-12-27 |
Family
ID=37586463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520091960 Expired - Fee Related CN2852507Y (en) | 2005-07-27 | 2005-07-27 | Frequency conversion speed-regulating motor using permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2852507Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969453A (en) * | 2013-02-04 | 2015-10-07 | 西门子公司 | Electrical machine with direct stator cooling |
-
2005
- 2005-07-27 CN CN 200520091960 patent/CN2852507Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969453A (en) * | 2013-02-04 | 2015-10-07 | 西门子公司 | Electrical machine with direct stator cooling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |