CN102013775A - Double-rotor unequal-pole permanent magnet torque motor for numerical control turntable - Google Patents
Double-rotor unequal-pole permanent magnet torque motor for numerical control turntable Download PDFInfo
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- CN102013775A CN102013775A CN 201110002097 CN201110002097A CN102013775A CN 102013775 A CN102013775 A CN 102013775A CN 201110002097 CN201110002097 CN 201110002097 CN 201110002097 A CN201110002097 A CN 201110002097A CN 102013775 A CN102013775 A CN 102013775A
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Abstract
The invention relates to a double-rotor unequal-pole permanent magnet torque motor for a numerical control turntable. The motor comprises an inner motor and an outer motor, wherein the inner motor comprises an inner motor stator and an inner motor rotor; the outer motor comprises an outer motor stator and an outer motor rotor; the cross section of the motor is provided with an inner motor rotor yoke, an inner motor stator yoke, a motor cooling structure, an outer motor stator yoke, outer motor rotor magnetic steel and an outer motor rotor yoke in turn from the center to the outside; inner air gaps are formed in the inner motor rotor yoke and the inner motor stator yoke; the inner motor stator yoke is provided with an inner motor stator tooth and an inner motor stator slot; the outer motor stator yoke is provided with an outer motor stator tooth and an outer motor stator slot; and outer air gaps are formed in the outer motor stator yoke and the outer motor rotor magnetic steel. The motor makes full use of the inner space of an outer rotor motor, and an inner rotor motor is arranged inside the space. An unequal-pole structure of the inner motor and the outer motor is used, and an inner rotor and an outer rotor are rigidly connected and rotate at the same speed, so that the motor has high manufacturability, high torque density and high servo accuracy.
Description
Technical field
The present invention relates to multi-shaft interlocked direct driving high-grade, digitally controlled machine tools and make the field, refer to that specifically the birotor that is used for the Digit Control Machine Tool turntable does not wait the number of poles permanent magnet torque motor.
Background technology
Direct drive mode has been broken traditional type of drive, all transmission link between having cancelled from the motor to the workbench, the length of machine tool feed driving-chain is shortened to zero as much as possible, direct drive mode is compared with the conventional ADS driving mode has advantages such as loss is low, torque is big, response speed is fast, it has broken through a lot of structural technological limits, and directly driving has become in the advanced manufacturing field a very important technology.
Because the particularity of direct driving technologies has also increased very big technical difficulty to electric drive, because cancelled mechanical transmission, so this just requires turntable motor self can produce bigger torque.Because the Digit Control Machine Tool turntable is subjected to spatial limitation, and the torque that produces must be satisfied the requirement of intensity and dynamic response, so the torque motor of designing will have good processing technology and high torque density, also require motor self that the low torque ripple of trying one's best is arranged simultaneously.
Dual rotor permanent magnetic motor is a kind of new structure motor, adopts permanent magnet and obtains high torque density and high efficiency, and its structure can be regarded an external rotor permanent magnet synchronous machine and the New-type electric machine that the internal rotor permanent-magnetic synchronous machine is nested together as.Have that structure is small and exquisite, simple, noise is little, the life-span is long, the efficient advantages of higher, can reduce volume greatly, therefore the efficient of raising system and dynamic property are used widely in fields such as the turbogenerator of machining, electric motor car, aeroengine and generatings.Motor can be divided into axial magnetic field permanent magnet motor and radial magnetic field magneto according to flow direction, the torque density of these two kinds of structure double-rotor machines, loss and efficient are approximate substantially, but the material consumption height of birotor axial magnetic field permanent magnet motor, need more permanent magnet, and this structure is not suitable for direct driving numerical control rotating platform.
The structure that traditional double-rotor machine adopts inside and outside motor slot number of poles all to equate, but interior motor is owing to be subjected to spatial limitation, the motor tooth is thin and high especially to manufacturing technique requirent especially in making, reduces motor shelf life, and the manufacturing brings difficulty to motor.Adopt inside and outside motor not wait the number of poles structure, broken traditional double-rotor machine structure, improve the manufacturability of motor.Because inside and outside motor pole number does not wait, and the inner and outer rotors rigid attachment, with the speed rotation, so, must reduce the synthetic cogging torque fluctuation of motor in order to guarantee that motor has higher servo accuracy.
Summary of the invention
The present invention be directed to the requirement of multi-shaft interlocked direct driving high-grade, digitally controlled machine tools turntable motor, have high torque density and good processing technology, adopt birotor not wait this special construction of number of poles permanent magnet torque motor for guaranteeing motor.Because inside and outside motor pole number does not wait and the inner and outer rotors rigid attachment, with the speed rotation, so in order to guarantee that motor has higher servo accuracy, employing evenly has the method for service notch at interior motor tooth top, make the inside and outside motor cogging torque curve of cyclical fluctuations have identical frequency, can make interior external stator torque pulsation form reverse phase difference by selecting suitable inside and outside motor notch size or changing inside and outside these two kinds of methods of motor notch relative position, reach the oppositely effect of stack of inside and outside motor cogging torque curve, thereby reduce the synthetic torque pulsation of motor.
Technical scheme of the present invention is:
The numerical control rotating platform birotor does not wait utmost point permanent magnet torque motor, it is characterized in that: described motor comprises Inner motor and outer motor, and wherein interior motor comprises interior motor stator, Inner rotor; Outer motor comprises outer motor stator, outer rotor; The cross-section center of motor outwards is equipped with interior rotor yoke portion, interior motor stator yoke portion, motor cooling structure, outer motor stator yoke portion, outer rotor magnet steel and outer rotor yoke portion successively, wherein between interior rotor yoke portion and interior motor stator yoke portion internal air gap is arranged; Motor stator tooth and interior motor stator slot in being equipped with in the interior motor stator yoke portion; In the outer motor stator yoke portion outer motor stator tooth, outer motor stator groove are installed; Between outer motor stator yoke portion and the outer rotor magnet steel outside air gap is arranged.
Be rigidly connected between the interior rotor of described motor and the outer rotor, with the speed rotation.
The motor stator tooth top evenly has auxiliary tank in described.
The degree of depth of described each auxiliary tank is all identical with width.
Number of poles, the groove number average of motor and outer motor are unequal in described.
It is 40 utmost points, 48 grooves that described motor adopts outer motor, and interior motor is the fractional slot winding form of 20 utmost points, 24 grooves.
The winding of described motor adopts every phase coil to be placed on the concentrated winding construction of this monodentate moulding in two adjacent grooves.
The cooling structure of described motor adopts water cooling plant.
Beneficial effect of the present invention is:
(1) adopt permanent magnet to replace electric excitation, make electric current reduce, therefore reduced the copper loss of motor, and the flow direction in the rotor core can not change, magnetic hysteresis loss almost is zero.
(2) because the torque density of motor is proportional to the air gap area of motor, and this special construction of double-rotor machine has inside and outside two rotors, form inside and outside two gap structure, be equivalent to increase the effective air gap area of motor, motor effective air gap area increases the then torque density increase of motor.
(3) adopt concentrated fractional slot winding structure, winding overhang is shortened widely, production technology is simple, reduce cost, reduce copper loss, under the situation of skewed slot not, reduced slot effect, improved the potential waveform of motor, the torque ripple when having reduced motor static state and low speed greatly.
(4) because inside and outside two this special constructions of rotor that the structure of double-rotor machine adopts, in theory can be so that outer radial magnetic pull can be cancelled out each other in it, on the other hand, because the electromagnetic torque direction that inner and outer rotors acts on the stator is opposite, the synthetic torque that stator is subjected to will be less, help the fixing of stator, improve the mechanical stability of double-rotor machine.
What (5) adopt is the structure that inside and outside two motors do not wait number of poles, and promptly outer motor adopts 40 utmost points, 48 grooves, and interior motor adopts 20 utmost points, 24 grooves, under same space situation, reduce interior motor teeth groove number, be equivalent to the thickness of broadening tooth, improve the motor processing technology, prolonged motor useful life.
(6) evenly have service notch at each tooth top of interior motor, make that inside and outside motor cogging torque vibration frequency is identical, can make inside and outside stator torque pulsation curve form reverse phase difference by selecting suitable inside and outside motor notch size or changing inside and outside these two kinds of methods of motor notch relative position, form the effect of reverse mutual superposition, effectively reduce the synthetic cogging torque of motor, improve the motor servo accuracy.
(7) double-rotor machine adopts water-cooling structure, and water cooling plant places between the inside and outside motor stator, can increase the motor radiating ability effectively like this.
Description of drawings:
Fig. 1 is that numerical control rotating platform birotor of the present invention does not wait the scheme of installation of number of poles permanent magnet torque motor on turntable;
Fig. 2 is that numerical control rotating platform birotor of the present invention does not wait number of poles permanent magnet torque motor cross sectional representation;
Fig. 3 is that numerical control rotating platform birotor of the present invention does not wait number of poles permanent magnet torque motor internal stator tooth top to open the service notch schematic diagram;
Fig. 4 is that numerical control rotating platform birotor of the present invention does not wait the inside and outside motor of number of poles permanent magnet torque motor not wait the notch structural representation;
Fig. 5 is that numerical control rotating platform birotor of the present invention does not wait the number of poles permanent magnet torque motor to change inside and outside motor notch relative position structural representation;
Description of reference numerals:
1. turntable working face, 2. Inner rotor, 3. Inner motor stator, 4. motor cools off and the stator mounting structure, 5. outer motor stator, 6. outer rotor, 7. motor bearings, 8. base, 9. cooling duct, 10. interior motor stator yoke portion, 11. interior motor stator tooth, 12. interior motor stator slot, 13. interior rotor yoke portion, 14. auxiliary tank, 15. outside air gap, 16. internal air gap, 17. motor cooling structure, 18. outer rotor magnet steel, 19. outer rotor yoke portion, 20. outer motor stator groove, 21. outer motor stator tooth, 22. outer motor stator yoke portion.
Embodiment:
The present invention is described in detail below in conjunction with accompanying drawing.
Fig. 1 is that numerical control rotating platform birotor of the present invention does not wait the scheme of installation of number of poles permanent magnet torque motor on turntable, as shown in the figure, base 8 is connected by motor bearings 7 with turntable working face 1, base 8 is connected with motor cooling and stator mounting structure 4, have cooling duct 9 on the base 8, the cooling structure in cooling of cooling duct 9 and motor and the stator mounting structure 4 communicates; On motor cooling and the stator mounting structure 4 motor is installed.Motor comprises Inner motor and outer motor, motor stator 3, Inner rotor 2 in wherein interior motor comprises; Outer motor comprises outer motor stator 5, outer rotor 6.The iron core of the iron core of interior rotor 2 and outer rotor 6 connects together by the end plate rigidity and rotation synchronously.
Digit Control Machine Tool turntable birotor of the present invention does not wait the number of poles permanent magnet torque motor, the double-rotor machine outer pole groove number that breaks traditions equates structure, number of poles, the groove number average of motor and outer motor are unequal in selecting for use, promptly the outer motor of Cai Yonging is 40 utmost points, 48 grooves, and interior motor is the fractional slot winding form of 20 utmost points, 24 grooves.Because outer motor intermediate structure space is narrow and small, if interior motor adopts 40 utmost points 48 grooves identical with outer motor, the width of so interior motor tooth can be very little, very difficult on the manufacturing production technology, and because interior motor stator tooth is extremely thin, in the operation that works long hours, be easy to impairedly, can reduce useful life of motor, so the special construction that motor utmost point groove number lacks than outer motor utmost point groove number in selecting.
The winding of this motor adopts every phase coil to be placed on the concentrated winding construction of this monodentate moulding in two adjacent grooves, and the outer motor of employing is 40 utmost points, 48 grooves, and interior motor is the fractional slot winding form of 20 utmost points, 24 grooves, and evenly has an auxiliary tank identical with depth of rebate and width on the tooth top of motor in each.Because a coil only overlaps a tooth, motor end winding shortens widely like this, produces simply, reduces cost, and the motor copper loss is lower.Under the situation of skewed slot not, reduced slot effect, improved the potential waveform of motor, the torque ripple when having reduced the static and low speed of motor greatly.
Fig. 2 is that numerical control rotating platform birotor of the present invention does not wait number of poles permanent magnet torque motor cross sectional representation, as shown in the figure, the cross-section center of motor outwards is equipped with interior rotor yoke portion 13, interior motor stator yoke portion 10, motor cooling structure 17, outer motor stator yoke portion 22, outer rotor magnet steel 18 and outer rotor yoke portion 19 successively, wherein between interior rotor yoke portion 13 and interior motor stator yoke portion 10 internal air gap 16 is arranged; Motor stator tooth 11 and interior motor stator slot 12 in being equipped with in the interior motor stator yoke portion 10; Because the cogging torque fluctuation is an important parameter that influences the motor servo accuracy, in order effectively to reduce the synthetic cogging torque of birotor permanent magnetic torque motor, the servo accuracy of motor is provided, motor stator tooth 11 tops also evenly have an auxiliary tank 14 in each, as shown in Figure 3, the depth of rebate of each auxiliary tank 14 is all identical with width, motor stator slot 12 in making, interior motor stator tooth 11 and outer motor stator groove 20, the torque ripple curve of outer motor stator tooth 21 has identical frequency, by selecting the size of suitable interior motor stator slot 12 and outer motor stator groove 20, as shown in Figure 4; Or change the relative position that interior motor stator slot 12 reaches outer motor stator groove 20, as shown in Figure 5; The torque pulsation of motor stator 3 and outer motor stator 5 forms reverse phase difference in can making by these two kinds of methods, effectively reduces the synthetic cogging torque of motor, the assurance motor have a higher servo accuracy.In the outer motor stator yoke portion 22 outer motor stator tooth 21, outer motor stator groove 20 are installed; Between outer motor stator yoke portion 22 and the outer rotor magnet steel 18 outside air gap 15 is arranged.Cooling structure 17 adopts water cooling plant in experiment, between motor stator 3 and the outer motor stator 5, can increase the motor radiating ability effectively like this in water cooling plant places.
The numerical control rotating platform birotor does not wait number of poles permanent magnet torque motor structure to break the structure that traditional birotor outer pole groove number equates, when having high torque density, and good processing technology is arranged.Because inner and outer rotors rigid attachment, with the speed rotation, so in order to guarantee that motor has higher servo accuracy, employing evenly has the method for a service notch at interior motor tooth top, make the inside and outside motor cogging torque curve of cyclical fluctuations have identical frequency, can make interior external stator torque pulsation form reverse phase difference by selecting suitable inside and outside motor notch size or changing inside and outside these two kinds of methods of motor notch relative position, and oppositely stack mutually.Reach the purpose that reduces the synthetic torque pulsation of motor.
Claims (8)
1. the numerical control rotating platform birotor does not wait utmost point permanent magnet torque motor, it is characterized in that: described motor comprises Inner motor and outer motor, and wherein interior motor comprises interior motor stator (3), Inner rotor (2); Outer motor comprises outer motor stator (5), outer rotor (6); The cross-section center of motor outwards is equipped with interior rotor yoke portion (13), interior motor stator yoke portion (10), motor cooling structure (17), outer motor stator yoke portion (22), outer rotor magnet steel (18) and outer rotor yoke portion (19) successively, wherein between interior rotor yoke portion (13) and interior motor stator yoke portion (10) internal air gap (16) is arranged; Motor stator tooth (11) and interior motor stator slot (12) in being equipped with in the interior motor stator yoke portion (10); Outer motor stator tooth (21), outer motor stator groove (20) are installed in the outer motor stator yoke portion (22); Between outer motor stator yoke portion (22) and the outer rotor magnet steel (18) outside air gap (15) is arranged.
2. do not wait utmost point permanent magnet torque motor according to the described numerical control rotating platform birotor of claim 1, it is characterized in that: be rigidly connected between the interior rotor (2) of described motor and the outer rotor (6), with the speed rotation.
3. do not wait utmost point permanent magnet torque motor according to the described numerical control rotating platform birotor of claim 1, it is characterized in that: motor stator tooth (11) top evenly has auxiliary tank (14) in described.
4. do not wait utmost point permanent magnet torque motor according to the described numerical control rotating platform birotor of claim 3, it is characterized in that: the degree of depth of described each auxiliary tank (14) is all identical with width.
5. do not wait utmost point permanent magnet torque motor according to the described numerical control rotating platform birotor of claim 1, it is characterized in that: number of poles, the groove number average of motor and outer motor are unequal in described.
6. do not wait utmost point permanent magnet torque motor according to the described numerical control rotating platform birotor of claim 5, it is characterized in that: it is 40 utmost points, 48 grooves that described motor adopts outer motor, and interior motor is the fractional slot winding form of 20 utmost points, 24 grooves.
7. do not wait utmost point permanent magnet torque motor according to the described numerical control rotating platform birotor of claim 6, it is characterized in that: the winding of described motor adopts every phase coil to be placed on the concentrated winding construction of this monodentate moulding in two adjacent grooves.
8. do not wait utmost point permanent magnet torque motor according to the described numerical control rotating platform birotor of claim 1, it is characterized in that: the cooling structure of described motor (17) adopts water cooling plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110002097 CN102013775A (en) | 2011-01-07 | 2011-01-07 | Double-rotor unequal-pole permanent magnet torque motor for numerical control turntable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110002097 CN102013775A (en) | 2011-01-07 | 2011-01-07 | Double-rotor unequal-pole permanent magnet torque motor for numerical control turntable |
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| CN102013775A true CN102013775A (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110002097 Pending CN102013775A (en) | 2011-01-07 | 2011-01-07 | Double-rotor unequal-pole permanent magnet torque motor for numerical control turntable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522870A (en) * | 2012-01-01 | 2012-06-27 | 中国船舶重工集团公司第七一二研究所 | Transverse flux permanent magnet motor topology |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200959537Y (en) * | 2006-08-11 | 2007-10-10 | 姜卫东 | Hub motor |
| CN101056024A (en) * | 2007-03-13 | 2007-10-17 | 沈阳工业大学 | Dual rotor permanent magnetic ring-shaped moment motor based on the phase shift technology |
| CN101330234A (en) * | 2008-04-21 | 2008-12-24 | 上海大学 | Direct-drive composite type permanent magnet motor |
| EP2112011A1 (en) * | 2008-04-22 | 2009-10-28 | Honda Motor Co., Ltd. | Controller for motor |
| CN201975958U (en) * | 2011-01-07 | 2011-09-14 | 沈阳工业大学 | Dual-rotor unequal-pole permanent magnet torque motor for numerically controlled rotary table |
-
2011
- 2011-01-07 CN CN 201110002097 patent/CN102013775A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200959537Y (en) * | 2006-08-11 | 2007-10-10 | 姜卫东 | Hub motor |
| CN101056024A (en) * | 2007-03-13 | 2007-10-17 | 沈阳工业大学 | Dual rotor permanent magnetic ring-shaped moment motor based on the phase shift technology |
| CN101330234A (en) * | 2008-04-21 | 2008-12-24 | 上海大学 | Direct-drive composite type permanent magnet motor |
| EP2112011A1 (en) * | 2008-04-22 | 2009-10-28 | Honda Motor Co., Ltd. | Controller for motor |
| CN201975958U (en) * | 2011-01-07 | 2011-09-14 | 沈阳工业大学 | Dual-rotor unequal-pole permanent magnet torque motor for numerically controlled rotary table |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522870A (en) * | 2012-01-01 | 2012-06-27 | 中国船舶重工集团公司第七一二研究所 | Transverse flux permanent magnet motor topology |
| CN102522870B (en) * | 2012-01-01 | 2014-07-09 | 中国船舶重工集团公司第七一二研究所 | Transverse flux permanent magnet motor topology |
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Application publication date: 20110413 |