CN1169614A - Cage-type ac. speed-regulated motor - Google Patents
Cage-type ac. speed-regulated motor Download PDFInfo
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- CN1169614A CN1169614A CN 96110104 CN96110104A CN1169614A CN 1169614 A CN1169614 A CN 1169614A CN 96110104 CN96110104 CN 96110104 CN 96110104 A CN96110104 A CN 96110104A CN 1169614 A CN1169614 A CN 1169614A
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- speed
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- phase shift
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Abstract
The squirrel-cage A. C. adjustable-speed motor includes two stators and one rotor. Two stator windings are designed according to change-pole logarithm and identical in structure, and mechanically coupled with the stators by means of driving mechanism fixed on the box-type motor frame to drive two stators and make them rotate in opposite rotating direction to change phase difference of two rotary magnetic fields. Because of the combination of change pole logarithm and phase-shifting speed-regulating principle, it possesses wide speed-regulating range, high effeciency, high reliability, high cost performance, and can implement stepless speed regulation for high-power and medium-high voltage motor, and can provide three kinds of speed-regulating modes.
Description
The present invention relates to the squirrel-cage ac adjustable speed motor that a kind of output speed can step-less adjustment.
At present, the squirrel cage motor mode of speed regulation mainly contains: 1. pole changing; 2. frequency control; 3. electromagnetic speed-adjusting.In addition, also have stator to be divided into two, add one of them stator of lever actuated with the feed screw nut and rotate with the moving-phase speed control scheme that changes two rotating magnetic field space quadratures and between two stators, add the moving-phase speed control scheme of joining phase shifter or changing connection squirrel cage motor.Such scheme respectively has deficiency.For step speed regulation, can not get level and smooth speed adjusting performance though pole changing efficient is high.Frequency control needs expensive frequency converter, and except that inconvenient maintenance, influence the reliability of system, the frequency converter that is applicable to high-power (as more than 110 kilowatts) or mesohigh (as 6 kilovolts) squirrel cage motor will be difficult for realization maybe can't be realized.The electromagnetic speed-adjusting complex structure, efficient is lower.Moving-phase speed control can be realized the step-less adjustment of rotating speed, zero to the rated speed scope during speed governing, the mechanical angle of phase shift maximum possible is 180 °, but obviously can't realize big like this corner with the phase shift system that feed screw nut adds the single stator of lever actuated, and speed adjustable range is subjected to the restriction of phase shift system.The phase shift scheme that becomes winding connection method between two stators is step speed regulation, adds to join phase shifter and make electric machine structure become more complicated, and cost increases, the reliability reduction.Efficient reduces during interior on a large scale speed governing, particularly when low speed efficient low be the deficiency of moving-phase speed control.
The purpose of this invention is to provide a kind of rotating speed can step-less adjustment, speed-regulating range width, and the reliability height, ratio of performance to price height, simple in structure, control is convenient, all has high efficiency squirrel-cage ac adjustable speed motor at low speed and on a large scale during speed governing.
The objective of the invention is pole-changing and moving-phase speed control principle combined and realize.The moving-phase speed control principle is: when the rotating magnetic field rotation direction unanimity of the stator winding of two independent magnetic circuits, rotating speed equates and when being arranged side by side on same axis, the rotor loop that is arranged in these two rotating magnetic fields synthesizes the faradic size of induced potential generation and the space quadrature that phase place depends on two rotating magnetic fields, according to the relation between rotor current, revolutional slip, the torque as can be known, the space quadrature (promptly changing the space relative rotation of two stators on same axis) that changes two rotating magnetic fields can be regulated continuously to the output speed of motor.Pole-changing and the combination of moving-phase speed control principle are divided into some rotating speeds interval with the output speed of motor by the synchronous speed of different poles logarithm correspondence, carry out moving-phase speed control in the rotating speed interval of each synchronous speed correspondence.The mode of speed regulation of phase shift again behind this pole-changing, its efficient will be higher than the moving-phase speed control mode in the big range of speeds of fixed pole logarithm, particularly also can have high efficiency when the slow-speed of revolution.
The present invention adopts different phase shift system and structures in the past.A stator design success rate of former squirrel cage motor is equated, two stators of identical in structure, its winding is designed to P to the utmost point, elongated rotor by pole-changing logarithm speed control principle.By being fixed on transmission mechanism and the two stator mechanical attachment on the box support, drive two stators and do the opposite rotation of rotation direction, to change the space quadrature of two rotating magnetic fields.
Above-mentioned transmission mechanism comprises phase shift gear and driving gear set, and the engagement of phase shift gear and driving gear set connects, and 1/4th gear rings of a complete spur gear of installing on driving gear set and the stator outer diameter mesh and connect.The phase shift gear is a bevel gear, and driving gear set is coaxial mounted bevel gear and spur gear.
Owing to adopted above-mentioned transmission mechanism, act on the identical countertorque on two stators, be delivered to the phase shift gear by driving gear set, the resultant moment on the phase shift gear shaft is zero.Compare with the phase shift system that drives single stator, phase shift speed is fast again, and it is minimum to drive required moment of stator and power, only needs the overcome friction square to drive and schedules, and stator can be stablized under the effect of moment of friction and rests on required optional position.The present invention is a variable pole adjustable speed motor, when constant number of pole-pairs when not phase shift, it is a moving-phase speed control motor, when pole-changing logarithm and moving-phase speed control combine, has speed-regulating range width, at whole speed adjustable range internal efficiency height, the reliability height, rapidity is good, ratio of performance to price height, and power controlling is minimum, realize the advantage of high-power and the stepless time adjustment of mesohigh motor easily, and can provide three kinds of modes of speed regulation selective.
Fig. 1 is a vertical section structure schematic diagram of the present invention;
Fig. 2 is the one phase equivalent circuit figure after the conversion of moving-phase speed control principle rotor.
The invention will be further described below in conjunction with accompanying drawing.
The stator 4 of motor is designed to two power and equates, the identical in structure stator, and its winding is designed to P to the utmost point by pole-changing logarithm speed control principle, and the core length of rotor 3 equates with the largest end face distance of two stators, 4 iron cores; Four/g gear ring of a complete spur gear is housed on the external diameter of stator 4, adopt of the heat radiation of box support 5 in order to motor, two stators 4 are axially limited in support 5, but it is rotatable, be fixed with phase shift gear 7 and driving gear set 6 on box support 5,6 engagements of phase shift gear 7 and driving gear set connect, and driving gear set 6 meshes with 1/4th gear rings on stator 4 external diameters and connects, can drive stator 4 and do the opposite rotation of rotation direction simultaneously, to change the space quadrature of two rotating magnetic fields.Two groups of travelling gear structural parameters are identical, and each stator rotational angle is identical, and single stator need only Rotate 180 °/2P, can make the phase difference of arbitrary number of pole-pairs stator winding rotating magnetic field reach 180 °.Phase shift gear 7 is a bevel gear, and driving gear set 6 is coaxial mounted bevel gear and spur gear, and the type of drive of phase shift gear 7 can be manually, also can be automatic.Because the meshing relation of phase shift gear 7 and driving gear set 6, after the feasible identical countertorque that acts on two stators is delivered to phase shift gear 7, resultant moment on phase shift gear 7 gear shafts is zero, compare with the phase shift system that drives single stator, phase shift speed is fast again, it is minimum to drive required moment of stator and power, and can make stator stably rest on required optional position.Three phase mains can directly insert stator winding.1 is fan housing among Fig. 1, and 2 is fan, and 8 is locating ring, and 9 is left and right sides end cap, and 10 is left and right sides bearing cap, and 11 is bearing.
Fig. 2 is the one phase equivalent circuit after the conversion of moving-phase speed control principle rotor, among the figure
r
1, x
1 σBe stator winding every phase copper loss resistance and leakage reactance;
r
m, x
mBe stator winding every phase iron loss resistance and excitatory reactance; r
2'/s, x '
2 σBe equivalent resistance and leakage reactance after the conversion of rotor winding, S is a revolutional slip;
It is the phase voltage of two stator winding; Phase difference is arranged during phase shift;
Be the induced potential on the rotor winding, phase difference is arranged during phase shift.
Claims (3)
1, a kind of squirrel-cage ac adjustable speed motor, comprise two stators (4) and a rotor (3), box support (5), it is characterized in that two stators (4) adopt the design of pole-changing logarithm, structure is identical, by being fixed on transmission mechanism and stator (4) mechanical attachment on the box support (5), driving stator (4) and do the opposite rotation of rotation direction.
2, squirrel-cage ac adjustable speed motor as claimed in claim 1, it is characterized in that said transmission mechanism comprises phase shift gear (7) and driving gear set (6), the engagement of phase shift gear (7) and driving gear set (6) connects, and 1/4th gear rings of installing on driving gear set (6) and the stator outer diameter mesh and connect.
3, squirrel-cage ac adjustable speed motor as claimed in claim 2 is characterized in that said phase shift gear (7) is bevel gear, and driving gear set (6) is coaxial installation bevel gear and spur gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96110104 CN1169614A (en) | 1996-06-29 | 1996-06-29 | Cage-type ac. speed-regulated motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96110104 CN1169614A (en) | 1996-06-29 | 1996-06-29 | Cage-type ac. speed-regulated motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1169614A true CN1169614A (en) | 1998-01-07 |
Family
ID=5120755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96110104 Pending CN1169614A (en) | 1996-06-29 | 1996-06-29 | Cage-type ac. speed-regulated motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1169614A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549621A (en) * | 2017-01-13 | 2017-03-29 | 张静 | A kind of inductive motor control system and its control method of electronic pole-changing |
-
1996
- 1996-06-29 CN CN 96110104 patent/CN1169614A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549621A (en) * | 2017-01-13 | 2017-03-29 | 张静 | A kind of inductive motor control system and its control method of electronic pole-changing |
| CN106549621B (en) * | 2017-01-13 | 2024-01-26 | 深圳市云林电气技术有限公司 | Control system and control method of induction motor with electronic pole changing function |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |