A double-row stranded single-side crossover winding

Abstract

The present invention relates to a double-row stranded wire single-side crossover winding, which is formed by bending a double-row stranded wire; a motor winding, including a motor coil and a double-row stranded wire crossover winding; the motor coil is an S-shaped wave-wound coil as a whole; the motor coil is embedded in the stator slot of the motor; two turns of the motor coil are welded at one end of the motor through the double-row stranded wire crossover winding, and two turns of the motor coil at the other end of the motor are connected in an existing manner. The double-row stranded wire single-side crossover winding is cross-connected at one end of the winding by end transposition, and the other end still retains the characteristics of the traditional coil winding connection, so as to solve the problem of excessive circulating current loss in the traditional coil winding, reduce the temperature rise of the motor, and significantly improve the reliability of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a double-row single-side strand-wire jumper winding. Background Art

[0002] The main features of the ring coil are that there are fewer design and production molds, concentrated application equipment, and higher work efficiency than the bar structure. Earlier, because the design and production level of the ring coil was generally lower than that of the bar coil, and the requirements of various quality standards for traditional ring coils were generally lower, the ring stator coil was generally suitable for electric motors and generators with smaller capacity. With the improvement of the design and production level of ring coils by various manufacturers and the gradual increase of the requirements of various quality standards for ring coils, the ring coil is no longer limited to small motors. The stator coils of large-capacity and high-voltage generators still widely use bar stator coils, but there are also very few who choose to use ring stator coils due to various factors such as manufacturing process, design, cost, and installation environment. In order to reduce the eddy current loss of the motor winding, the winding will be divided into multiple flat wire windings with small cross-sectional areas and connected in parallel at the ends, but this method will cause unbalanced leakage inductance potentials between the parallel-wound strands, and there will be potential differences between the strands, which will cause circulating current losses. In addition, in the existing ring coil, whenever the winding is connected to another slot, the position of the strands will inevitably change. The strands near the slot in the winding will be twisted to the bottom of the slot in a single row, causing a large circulating current, thereby causing serious temperature rise in the motor, which is not conducive to operation. Summary of the invention

[0003] The purpose of the present invention is to provide a double-row stranded wire single-side crossover winding, by transposing the ends, the strands are cross-connected at one end of the winding, and the other end still retains the characteristics of the traditional coil winding connection, so as to solve the problem of excessive circulating current loss in the traditional coil winding, reduce the temperature rise of the motor, and significantly improve the reliability of the motor.

[0004] The technical solution of the present invention is as follows:

[0005] A double-row stranded wire jumper winding is formed by bending a double-row stranded wire, each row of the double-row stranded wire has 2n strands;

[0006] The two rows of strands extend forward in a straight line in the horizontal direction at the initial point, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent obliquely upward and extended, and at the same time, the n strands in the lower row of the first row and the n strands in the lower row of the second row are bent obliquely downward and extended, and the extended strands are bent to the horizontal direction and extended for a set distance in the horizontal direction; the n strands in the upper row of the first row and the n strands in the upper row of the second row are first bent 90 degrees away from each other, then bent downward in the vertical direction and extended to the height of the initial point of the n strands in the lower row of the first row and the n strands in the lower row of the second row, and then bent 90 degrees toward each other, and finally, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent 90 degrees to the horizontal direction at the same time and extended forward for a set distance to the end point;

[0007] The n strands of wire in the lower row of the first row and the n strands of wire in the lower row of the second row are first bent 90 degrees away from each other, then bent upward in the vertical direction and extended to the height of the initial points of the n strands of wire in the upper row of the first row and the n strands of wire in the upper row of the second row, then bent 90 degrees toward each other, and finally bent 90 degrees to the horizontal direction and extended forward a set distance to the end point; the strands do not touch each other during bending.

[0008] A double-row stranded wire jumper winding is formed by bending a double-row stranded wire, each row of the double-row stranded wire has 2n+1 strands;

[0009] The two rows of strands extend forward in a straight line in the horizontal direction at the initial point, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent obliquely upward and extended, and at the same time, the n strands in the lower row of the first row and the n strands in the lower row of the second row are bent obliquely downward and extended, and the extended strands are bent to the horizontal direction and extended for a set distance in the horizontal direction; the n strands in the upper row of the first row and the n strands in the upper row of the second row are first bent 90 degrees away from each other, then bent downward in the vertical direction and extended to the height of the initial point of the n strands in the lower row of the first row and the n strands in the lower row of the second row, and then bent 90 degrees toward each other, and finally, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent 90 degrees to the horizontal direction at the same time and extended forward for a set distance to the end point;

[0010] The n strands of the lower row of the first row and the n strands of the lower row of the second row are first bent 90 degrees away from each other, then bent upward in the vertical direction and extended to the height of the initial points of the n strands of the upper row of the first row and the n strands of the upper row of the second row, then bent 90 degrees toward each other, and finally bent 90 degrees to the horizontal direction and extended forward a set distance to the end point; the strands of the first row and the second row, the n+1th column, do not change, and extend in a straight line from the initial point to the end point in the horizontal direction; the strands do not touch each other when bending.

[0011] A motor winding, comprising a motor coil and a double-row strand-wire crossover winding with 2n strands in each row or a double-row strand-wire crossover winding with 2n+1 strands in each row;

[0012] The motor coil is an S-shaped wave-wound coil as a whole; the motor coil is embedded in the stator slot of the motor; two turns of the motor coil are welded at one end of the motor through the double-row stranded wire jumper winding, and the two turns of the motor coil at the other end of the motor are connected in an existing manner.

[0013] The beneficial effects of the present invention are:

[0014] Through end transposition, the strands are bridged at one end of the winding, while the other end still retains the characteristics of the traditional coil winding connection, changing the inherent strand transposition characteristics of the traditional coil winding. Welding double-row strands across the winding can achieve the effect of winding strand transposition, thereby reducing the motor's circulating current loss, reducing the motor's temperature rise, and significantly improving the motor's reliability. Taking a 2700kW twelve-phase permanent magnet synchronous generator as an example, the motor's circulating current loss is 9.21kW when using traditional coil windings, and the circulating current loss is 3.515kW after using double-row strands across the winding, reducing the circulating current loss by 5.695kW. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a double-row stranded wire jumper winding.

[0016] Figure 2 The winding end of the double-row stranded wire jumper winding is welded on the non-driving end side of the motor.

[0017] Figure 3 This is the front view of the motor A1 phase winding arrangement.

[0018] Figure 4 This is a top view of the entire motor winding arrangement. DETAILED DESCRIPTION

[0019] Specific implementation method 1: Combination Figure 1 To illustrate the present embodiment, a double-row strand jumper winding is formed by bending a double-row strand, each row of the double-row strand has 2n strands;

[0020] The two rows of strands extend forward in a straight line in the horizontal direction at the initial point, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent obliquely upward and extended, and at the same time, the n strands in the lower row of the first row and the n strands in the lower row of the second row are bent obliquely downward and extended, and the extended strands are bent to the horizontal direction and extended for a set distance in the horizontal direction; the n strands in the upper row of the first row and the n strands in the upper row of the second row are first bent 90 degrees away from each other, then bent downward in the vertical direction and extended to the height of the initial point of the n strands in the lower row of the first row and the n strands in the lower row of the second row, and then bent 90 degrees toward each other, and finally, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent 90 degrees to the horizontal direction at the same time and extended forward for a set distance to the end point;

[0021] The n strands of wire in the lower row of the first row and the n strands of wire in the lower row of the second row are first bent 90 degrees away from each other, then bent upward in the vertical direction and extended to the height of the initial points of the n strands of wire in the upper row of the first row and the n strands of wire in the upper row of the second row, then bent 90 degrees toward each other, and finally bent 90 degrees to the horizontal direction and extended forward a set distance to the end point; the strands do not touch each other during bending.

[0022] Specific implementation method 2: Combination Figure 1 The present embodiment is described as a double-row strand jumper winding, which is formed by bending a double row of strands; each row of the double-row strands has 2n+1 strands; the two rows of strands extend straight forward in the horizontal direction at the initial point, the n strands in the first row and the n strands in the second row are bent obliquely upward and extended, and at the same time, the n strands in the first row and the n strands in the second row are bent obliquely downward and extended, and the extended strands are bent to the horizontal direction and extended for a set distance in the horizontal direction; the n strands in the first row and the n strands in the second row are first bent 90 degrees away from each other, then bent downward in the vertical direction and extended to the initial point height of the n strands in the first row and the n strands in the second row, then bent 90 degrees towards each other, and finally the n strands in the first row and the n strands in the second row are bent 90 degrees to the horizontal direction at the same time and extended forward for a set distance to the end point;

[0023] The n strands of the lower row of the first row and the n strands of the lower row of the second row are first bent 90 degrees away from each other, then bent upward in the vertical direction and extended to the height of the initial points of the n strands of the upper row of the first row and the n strands of the upper row of the second row, then bent 90 degrees toward each other, and finally bent 90 degrees to the horizontal direction and extended forward a set distance to the end point; the strands of the first row and the second row, the n+1th column, do not change, and extend in a straight line from the initial point to the end point in the horizontal direction; the strands do not touch each other when bending.

[0024] Specific implementation method three: Combination Figure 2 , Figure 3 This embodiment is described as follows: a motor winding includes a motor coil and a double-row strand crossover winding with 2n strands in each row or a double-row strand crossover winding with 2n+1 strands in each row; the motor coil is an S-shaped wave-wound coil as a whole; the motor coil is embedded in the stator slot of the motor; two turns of the motor coil are welded at one end of the motor through the double-row strand crossover winding, and two turns of the motor coil at the other end of the motor are connected in an existing manner. Other components and connection relationships are the same as those of the first or second embodiment.

[0025] Through end transposition, the strands are bridged at one end of the winding, while the other end still retains the characteristics of the traditional coil winding connection, changing the inherent strand transposition characteristics of the traditional coil winding. Welding double-row strand crossover windings can achieve the effect of winding strand transposition, thereby reducing the motor's circulating current loss. The double-row strand crossover winding changes the position of the strands at the end, and changes the relative position of the strands at one end of the motor connected to the double-row crossover winding, thereby reducing the circulating current loss through a mixed transposition method.

[0026] Specific implementation method four: Combination Figure 2 In this embodiment, the double-row strand crossover winding has a first connection part 1 at one end of the initial point connected to the first connection part 1 and a second connection part 2 at one end of the final point connected to the second connection part 2; the first connection part 1 and the second connection part 2 are used to weld the motor coil. Other components and connection relationships are the same as those of the first, second or third embodiments.

[0027] Specific implementation method five: Combination Figure 1 In this embodiment, the distance between the n strands of the first row and the n strands of the second row bent upward and extending horizontally and the distance between the n strands of the first row and the n strands of the second row bent downward and extending horizontally is 1.5-3 times the strand width; the set distance is 10-15mm; the strands do not cross when bent. Other specific embodiments are the same as specific embodiments one, two, three or four.

[0028] During the bending process of the strands, the strands do not touch or cross each other, so as to avoid affecting the effect of the double-row cross-winding in suppressing the circulating current.

[0029] Specific implementation method six: Combination Figure 3 In this embodiment, the nose end of one end of the motor uses a combination of a parallel head cap and a double-row stranded wire crossover winding. Other components and connection relationships are the same as those of the first, second, third, fourth or fifth embodiments.

[0030] The mixed use of parallel head sleeves and double-row strand crossover windings can achieve a better effect of suppressing circulating current.

[0031] Specific implementation method seven: Combination Figure 1 In this embodiment, the double-row stranded wire is a double-row copper stranded wire coated with insulating paint. Other components and connection relationships are the same as those of the first, second, third, fourth, fifth or sixth embodiment.

[0032] The position of the copper strands is changed by physical means, ultimately achieving the purpose of strand transposition.

[0033] Example

[0034] This embodiment takes a double-row strand-wire jumper winding with 8 strands in each row as an example. Figure 1-4This embodiment is described.

[0035] When there are 8 strands in each row of the double-row strands, that is, 2×8 double-row strands, the two rows of strands extend straightly forward in the horizontal direction at the initial point, the 4 strands in the upper row of the first row and the 4 strands in the upper row of the second row are bent obliquely upward and extended, and at the same time, the 4 strands in the lower row of the first row and the 4 strands in the lower row of the second row are bent obliquely downward and extended, and the extended strands are bent to the horizontal direction and extended in the horizontal direction for a set distance; the distance that the 4 strands in the upper row of the first row and the 4 strands in the upper row of the second row are bent to the horizontal direction after extension and extended in the horizontal direction is 1.5 times the strand width than the distance that the 4 strands in the lower row of the first row and the 4 strands in the lower row of the second row are extended; the 4 strands in the upper row of the first row and the 4 strands in the upper row of the second row are bent to the horizontal direction and extended in the horizontal direction for a set distance; First, they are bent 90 degrees away from each other, then bent downward in the vertical direction and extended to the initial point height of the 4 strands below the first row and the 4 strands below the second row, then bent 90 degrees towards each other, and finally the 4 strands above the first row and the 4 strands above the second row are bent 90 degrees to the horizontal direction at the same time and 10 mm forward to the end point; the 4 strands below the first row and the 4 strands below the second row are first bent 90 degrees away from each other, then bent upward in the vertical direction and extended to the initial point height of the 4 strands above the first row and the 4 strands above the second row, then bent 90 degrees towards each other, and finally bent 90 degrees to the horizontal direction and extended 15 mm forward to the end point, forming a 2×8 double-row strand jumper winding. The initial point of the 2×8 double-row strand jumper winding is connected to the first connection part 1, and the end point of the 2×8 double-row strand jumper winding is connected to the second connection part 2.

[0036] The two-turn motor coil is welded with 2×8 double-row strands at the non-driving end of the motor through the first connection part 1 and the second connection part 2 to form a cross-winding. The motor coil at the driving end of the motor maintains a normal traditional coil. The full-pitch winding is adopted. After the one-phase motor winding is wound together, it is welded at the end and then embedded in the stator slot of the 2700kW twelve-phase permanent magnet synchronous generator. The effect after embedding is as follows Figure 3 The remaining phase motor windings are wound and welded according to the winding method and welding method of this phase. After all the motor stator windings are embedded, Figure 4 As shown. If short-distance winding is adopted, all phase motor windings need to be wound together, and then embedded in the motor stator slots, and double-row strands are welded at the ends to connect the windings. Taking a 2700kW twelve-phase permanent magnet synchronous generator as an example, the motor circulating current loss is 9.21kW when using traditional ring windings, and the circulating current loss is 3.515kW after using double-row strands to connect the windings, which reduces the circulating current loss by 5.695kW.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-row strand-wire jumper winding, characterized in that: It is formed by bending a double row of strands, each row of which has 2n strands; The two rows of strands extend forward in a straight line in the horizontal direction at the initial point, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent obliquely upward and extended, and at the same time, the n strands in the lower row of the first row and the n strands in the lower row of the second row are bent obliquely downward and extended, and the extended strands are bent to the horizontal direction and extended for a set distance in the horizontal direction; the n strands in the upper row of the first row and the n strands in the upper row of the second row are first bent 90 degrees away from each other, then bent downward in the vertical direction and extended to the height of the initial point of the n strands in the lower row of the first row and the n strands in the lower row of the second row, and then bent 90 degrees toward each other, and finally, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent 90 degrees to the horizontal direction at the same time and extended forward for a set distance to the end point; The n strands of wire in the lower row of the first row and the n strands of wire in the lower row of the second row are first bent 90 degrees away from each other, then bent upward in the vertical direction and extended to the height of the initial points of the n strands of wire in the upper row of the first row and the n strands of wire in the upper row of the second row, then bent 90 degrees toward each other, and finally bent 90 degrees to the horizontal direction and extended forward a set distance to the end point; the strands do not touch each other during bending.

2. A double-row strand-wire jumper winding, characterized in that: It is formed by bending a double row of strands; each row of the double row of strands has 2n+1 strands; The two rows of strands extend forward in a straight line in the horizontal direction at the initial point, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent obliquely upward and extended, and at the same time, the n strands in the lower row of the first row and the n strands in the lower row of the second row are bent obliquely downward and extended, and the extended strands are bent to the horizontal direction and extended for a set distance in the horizontal direction; the n strands in the upper row of the first row and the n strands in the upper row of the second row are first bent 90 degrees away from each other, then bent downward in the vertical direction and extended to the height of the initial point of the n strands in the lower row of the first row and the n strands in the lower row of the second row, and then bent 90 degrees toward each other, and finally, the n strands in the upper row of the first row and the n strands in the upper row of the second row are bent 90 degrees to the horizontal direction at the same time and extended forward for a set distance to the end point; The n strands of the lower row of the first row and the n strands of the lower row of the second row are first bent 90 degrees away from each other, then bent upward in the vertical direction and extended to the height of the initial points of the n strands of the upper row of the first row and the n strands of the upper row of the second row, then bent 90 degrees toward each other, and finally bent 90 degrees to the horizontal direction and extended forward a set distance to the end point; the strands of the first row and the second row, the n+1th column, do not change, and extend in a straight line from the initial point to the end point in the horizontal direction; the strands do not touch each other when bending.

3. A double-row strand jumper winding as claimed in claim 1 or 2, characterized in that: One end of the initial point is connected to a first connection part (1), and one end of the terminal point is connected to a second connection part (2); the first connection part (1) and the second connection part (2) are used for welding motor coils.

4. A double-row strand jumper winding as claimed in claim 1 or 2, characterized in that: The distance between the n strands of the first row and the n strands of the second row that are bent upward and extended and extended in the horizontal direction is 1.5-3 times the strand width; the set distance is 10-15mm; the strands do not cross when bending.

5. A double-row strand jumper winding as claimed in claim 3, characterized in that: The nose end of one end of the motor uses a mixed head cover and a double-row stranded wire jumper winding.

6. A double-row strand jumper winding as claimed in claim 1 or 2, characterized in that: The double-row stranded wires are double-row copper stranded wires coated with insulating paint.

7. A motor winding, characterized in that: It comprises a motor coil and the double-row strand jumper winding as claimed in claim 1 or 2; The motor coil is an S-shaped wave-wound coil as a whole; the motor coil is embedded in the stator slot of the motor; two turns of the motor coil are welded at one end of the motor through the double-row stranded wire jumper winding, and the two turns of the motor coil at the other end of the motor are connected in an existing manner.

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