120-degree phase belt pole-changing double-speed single winding wiring method

Abstract

The invention discloses a 120-degree phase belt pole-changing double-speed single winding wiring method, which is characterized in that a winding is a three-phase winding, and comprises the following steps: respectively drawing star vector diagrams of two pole numbers by adopting a 120-degree phase belt method; comparing the star vector diagrams to find out the same slot number in the A of one pole number and the A of the other pole number, wherein the same slot number forms a basic unit; repeating the operation to respectively find out basic units in B and C; according to a basic unit rule, the rest slot numbers in the A are arranged in sequence, and basic units of the rest slot numbers are found; and repeating the operation to respectively find out the basic units of the residual cell numbers in B and C. The pole-changing double-speed single-winding structure has the advantages that the pole-changing double-speed single-winding structure is high in winding coefficient, few in outgoing line ends, free of subharmonic and circulating current, high in efficiency, low in cost, simple in structure and convenient to control, the main performance of the motor can reach the level of a single-speed motor with the 120-degree phase winding corresponding capacity, and the energy-saving requirement is met.

Description

Technical Field

[0001] The invention belongs to the technical field of motor winding design, and specifically relates to a 120° phase-band pole-changing double-speed single winding connection method, which is used for a single-winding double-speed winding structure for drive motors such as fans and water pumps. Background Art

[0002] Pole-changing two-speed motors are divided into two categories according to the number of winding sets in the stator. One is double-winding pole-changing, that is, there are two sets of windings in the stator, each set of windings corresponds to one pole number, and one set of windings is replaced when changing poles; the other is single-winding pole-changing, that is, there is only one set of windings in the stator, and the number of poles is changed by changing the winding connection method and phase. Compared with single-winding pole-changing, the advantage of double-winding pole-changing is that both sets of windings can have a regular 60° phase band distribution, have a large distribution coefficient, and there is no "subharmonic" in the magnetomotive force. The disadvantage is that there are two sets of windings in the stator winding, the use of copper material is naturally doubled, the effective area in the slot is reduced, the temperature rise is increased, the harmonic content is more, and the amplitude is larger. At the same time, due to the deepening of the stator slot, the stator slot leakage reactance becomes larger, and the motor overload capacity is reduced. Moreover, the upper and lower coils in the slot produce relative movement, one cold and one hot, which will cause the stator winding end to be unstable and the coil in the slot to be worn too much. Therefore, single-winding pole-changing has greater practical potential than double-winding pole-changing.

[0003] Single winding pole changing can be divided into reverse pole changing and phase shift pole changing according to the pole changing method. The reverse method refers to changing the current direction of some coils to change the number of poles of the motor. Its characteristics are fewer output ends and simple switch control. However, after the pole changing, it is usually 120° phase belt and 180° phase belt, so the winding coefficient after the pole changing is low. The phase shift method refers to changing the original phase of each coil and recombining all coils to three phases. Its characteristics are that most pole changing schemes have more output ends, and a higher winding coefficient can be obtained before and after the pole changing. Summary of the invention

[0004] The purpose of the present invention is to provide a 120° phase-band pole-changing double-speed single winding wiring method, which overcomes the disadvantages of double-winding pole-changing, such as large copper material utilization rate, large stator slot leakage reactance, low overload capacity, unstable winding end fixation, large coil wear in the slot, large motor size, and high cost; at the same time, it overcomes the disadvantages of single-winding pole-changing, such as low winding coefficient, many outlet ends, "subharmonics" and circulating currents, and loss and increased noise caused by potential imbalance between branches; a pole-changing double-speed single winding structure with high winding coefficient, few outlet ends, no "subharmonics" and circulating currents, high efficiency, low cost, simple structure, and convenient control is designed, which can make the main performance of the motor reach the level of the corresponding 120° phase-band winding single-speed motor, and meet the energy-saving requirements.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A 120° phase-changeable double-speed single winding connection method, the winding is a three-phase winding, comprising:

[0007] S1. Each slot number represents a coil, and the star-shaped vector diagrams of two pole numbers are drawn using the 120° phase belt method;

[0008] S2. Compare the star vector diagram to find the same slot number in A of one pole number and A of another pole number, and the same slot numbers form a basic unit;

[0009] S3. Repeat S2 to find the basic units in B and C respectively;

[0010] S4. According to the basic unit rule, the remaining slot numbers in A are arranged in sequence to find the basic unit of the remaining slot numbers;

[0011] S5. Repeat S4 to find the basic units of the remaining slot numbers in B and C respectively.

[0012] Furthermore, in S4, when the basic unit pattern is not obvious, A in the star-shaped vector diagram with a small number of poles and B and C in the star-shaped vector diagram with a large number of poles are compared in turn to find the same slot number, so as to determine the basic unit of the remaining slot number in the star-shaped vector diagram with a small number of poles.

[0013] Furthermore, each circle of slot numbers in the star vector diagram represents a coil under a pair of magnetic poles.

[0014] Furthermore, each basic unit includes the same number of slot numbers.

[0015] Furthermore, each phase includes the same number of basic units.

[0016] Furthermore, each phase includes three basic units.

[0017] Furthermore, the basic units are connected in parallel and / or in series to form various styles of pole-changing dual-speed single windings.

[0018] Furthermore, the A-phase basic units form a U-phase winding with a pole number; the B-phase basic units form a V-phase winding with a pole number; the C-phase basic units form a W-phase winding with a pole number; and changing the order of the basic unit groups forms another pole number of U-phase, V-phase, and W-phase.

[0019] Furthermore, the basic unit is shared by two pole numbers, and the winding connections in the basic unit are the same.

[0020] Furthermore, the winding is a double-layer three-phase winding, and all coil pitches are the same.

[0021] The beneficial effects of the present invention are as follows: the disadvantages of the double-winding pole-changing device, such as large copper material utilization rate, large stator slot leakage reactance, low overload capacity, unstable winding end fixation, large coil wear in the slot, large motor size, and high cost, are overcome; at the same time, the disadvantages of the single-winding pole-changing device, such as low winding coefficient, many outlet ends, "subharmonics" and circulating currents, and loss and increased noise caused by potential imbalance between branches, are overcome, and a pole-changing double-speed single-winding structure with high winding coefficient, few outlet ends, no "subharmonics" and circulating currents, high efficiency, low cost, simple structure, and convenient control is designed, which can make the main performance of the motor reach the level of a single-speed motor with a 120° phase belt winding of corresponding capacity, and meet the requirements of energy saving.

[0022] This wiring method is universal and applicable to pole-changing two-speed motors with any pole ratio, especially pole-changing two-speed motors with a large number of poles and similar pole numbers.

[0023] The aforementioned main scheme of the present invention and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection by the present invention; and in the present invention, (non-conflicting options) options and other options can also be freely combined. After understanding the scheme of the present invention, those skilled in the art can understand that there are many combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present invention, and they are not exhaustively listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a star vector diagram of a 14 / 16 pole 144 slot pole-changing dual-speed motor according to embodiment 2 of the present invention.

[0025] Figure 2 It is the basic unit of the 14 / 16 pole 144 slot pole-changing dual-speed motor winding U14, V14, and W14 of embodiment 2 of the present invention.

[0026] Figure 3 The 14 / 16-pole 144-slot pole-changing dual-speed motor windings U16, V16, and W16 basic units of the second embodiment of the present invention (each slot number still retains its Figure 2 in the order of ).

[0027] Figure 4 This is the Y / Y connection method of the 14 / 16 pole 144 slot pole-changing dual-speed motor windings of embodiment 2 of the present invention.

[0028] Figure 5 This is the star vector diagram of the 6 / 8-pole 72-slot pole-changing dual-speed motor of Example 3 of the present invention.

[0029] Figure 6 It is the basic unit of the 6 / 8-pole 72-slot pole-changing dual-speed motor winding U6, V6, and W6 of Example 3 of the present invention.

[0030] Figure 7The 6 / 8-pole 72-slot variable-pole dual-speed motor windings U8, V8, and W8 basic units of the third embodiment of the present invention (each slot number still retains its Figure 6 in the order of ).

[0031] Figure 8 This is the Y / Y connection method of the windings of a 6 / 8-pole 72-slot pole-changing dual-speed motor according to embodiment 3 of the present invention.

[0032] In the figure: the negative sign indicates the current is reversed, and the horizontal line above the slot number indicates that the current is reversed again; U14—U phase of a 14-pole motor; V14—V phase of a 14-pole motor; W14—W phase of a 14-pole motor; U16—U phase of a 16-pole motor; V16—V phase of a 16-pole motor; W16—W phase of a 16-pole motor. DETAILED DESCRIPTION

[0033] The following non-limiting examples serve to illustrate the invention.

[0034] Example 1

[0035] A 120° phase-changeable double-speed single winding connection method, the winding is a three-phase winding, comprising:

[0036] S1. Each slot number represents a coil, and the star-shaped vector diagrams of two pole numbers are drawn using the 120° phase belt method;

[0037] S2. Compare the star vector diagram to find the same slot number in A of one pole number and A of another pole number, and the same slot numbers form a basic unit;

[0038] S3. Repeat S2 to find the basic units in B and C respectively;

[0039] S4. According to the basic unit rule, the remaining slot numbers in A are arranged in sequence to find the basic unit of the remaining slot numbers;

[0040] S5. Repeat S4 to find the basic units of the remaining slot numbers in B and C respectively.

[0041] In S4, when the basic unit pattern is not obvious, A in the star-shaped vector diagram with a small number of poles is compared with B and C in the star-shaped vector diagram with a large number of poles to find the same slot number, so as to determine the basic unit of the remaining slot number in the star-shaped vector diagram with a small number of poles.

[0042] Each slot number in the star vector diagram represents a coil under a pair of magnetic poles.

[0043] Each basic unit contains the same number of slots.

[0044] Each phase contains the same number of basic units.

[0045] Each phase consists of three basic units.

[0046] The basic units are connected in parallel and / or in series to form various styles of pole-changing double-speed single windings.

[0047] The A-phase basic unit forms a U-phase winding with a pole number; the B-phase basic unit forms a V-phase winding with a pole number; the C-phase basic unit forms a W-phase winding with a pole number; changing the order of the basic unit group will form another pole number of U-phase, V-phase, and W-phase.

[0048] The basic unit has two pole numbers and the winding connections in the basic unit are the same.

[0049] The winding is a double-layer three-phase winding with all coils having the same pitch.

[0050] Example 2

[0051] A 120° phase-band pole-changing double-speed single winding connection method is refined on the basis of Example 1.

[0052] Taking a 14 / 16 pole, 144 slot variable pole double speed motor as an example, a star vector diagram with different pole numbers is drawn according to the 120° phase band, such as Figure 1 shown.

[0053] Comparing A in the 14-pole and A in the 16-pole, it can be seen that they together include 131, 130, 129, 128, 127, 1, 2, 3, 4, 5, 6, 22, 23, 24 (arranged in the order of their slots in the stator), so these 16 slots are a basic unit.

[0054] Comparing B in 14 poles with B in 16 poles, it can be seen that they together include 138, 137, 136, 135, 134, 133, 117, 116, 115, 8, 9, 10, 11, 12, 29, 30 (arranged in the order of their slots in the stator), so these 16 slots are a basic unit.

[0055] Comparing C in the 14-pole and C in the 16-pole, it can be seen that they together include 144, 143, 142, 141, 140, 139, 124, 123, 122, 121, 103, 15, 16, 17, 18, 36 (arranged in the order of their stator slots), so these 16 slots are a basic unit.

[0056] It can be seen that the number of basic unit slots is 16. 144 slots are divided into 120° phase belts, the number of slots in each phase belt is 144 / 3=48, and the A phase belt contains a total of 48 / 16=3 basic units, that is, one phase contains 3 basic units.

[0057] from Figure 1It can be seen from A that the U-phase basic unit is the 16 slots in A. In the 14-pole star vector diagram, the 16 slots in A are selected in sequence: 7, 25, 26, 27, 28, 43, 44, 45, 46, 47, 48, 63, 64, 65, 66, 84 to form the second U14-phase basic unit.

[0058] from Figure 1 It can be seen from A that the basic unit of U14 phase is 16 slots in A. If the pattern is not obvious, the second method can be used to compare A in 14 poles with B in 16 poles to find the number of slots with the same slot number: 7, 25, 26, 27, 28, 43, 44, 45, 46, 47, 48, 63, 64, 65, 66, 84, which constitute the second basic unit of U14 phase.

[0059] The third basic unit of the U14 phase can be selected according to the regular pattern, or according to the number of slots with the same slot numbers in its 14-pole A and 16-pole C: 67, 68, 69, 85, 86, 87, 88, 89, 92, 104, 105, 106, 107, 108, 125, 126, for a total of 16 slots.

[0060] According to this method, the 8 basic units of V14 phase and W14 in the 14 poles are found respectively, and the 3 basic units of U14, V14 and W14 are found respectively. Figure 2 shown.

[0061] Figure 2 As shown, U14, V14, and W14 each contain 3 basic units, which can form a winding style with 1 or 3 parallel branches.

[0062] From the basic units of U14, V14, and W14, find the three basic units of U16, V16, and W16 respectively, such as Figure 3 (The slot number still retains its Figure 2 in the order of ).

[0063] Figure 3 As shown, U16, V16, and W16 each contain 8 basic units and are Figure 2 The basic units are the same, but only the arrangement order of the basic units is different, and winding styles with 1 or 3 parallel branches can also be formed.

[0064] Figure 4 The figure shows the 3Y / 3Y wiring method of the 14 / 16 pole 144 slot pole-changing dual-speed motor winding.

[0065] Example 3

[0066] A 120° phase-band pole-changing double-speed single winding connection method is refined on the basis of Example 1.

[0067] Taking a 6 / 8 pole, 72 slot variable pole dual speed motor as an example, a star vector diagram with different pole numbers is drawn according to the 120° phase band, such as Figure 5 shown.

[0068] Comparing A in the 6-pole and A in the 8-pole, it can be seen that they both include 56, 55, 1, 2, 3, 4, 5, 6 (arranged in the order of their slots in the stator), so these 8 slots are a basic unit.

[0069] Comparing B in 6 poles with B in 8 poles, they both include 64, 63, 62, 61, 9, 10, 11, 12 (arranged in the order of their slots in the stator), so these 8 slots are a basic unit.

[0070] Comparing C in the 6-pole and C in the 8-pole, it can be seen that they both include 72, 71, 70, 69, 68, 67, 17, and 18 (arranged in the order of their slots in the stator), so these 8 slots are a basic unit.

[0071] It can be seen that the number of basic unit slots is 8. 72 slots are divided into 120° phase belts, and the number of slots in each phase belt is 72 / 3=24, and the two phase belts A and X contain 24 / 8=3 basic units in total, that is, one phase contains 3 basic units.

[0072] from Figure 5 It can be seen from A that the basic unit of U6 phase is the 8 slots in A. In the 6-pole star vector diagram, the 8 slots in A are selected in sequence: 7, 8, 25, 26, 27, 28, 29, 30 to form the second basic unit of U6 phase.

[0073] from Figure 5 It can be seen from A that the basic unit of U6 phase is 8 slots in A. If the pattern is not obvious, the second method can be used to compare A in 6 poles with B in 8 poles to find the number of slots with the same slot number: 7, 8, 25, 26, 27, 28, 29, 30, forming the second basic unit of U6 phase.

[0074] The third basic unit of the U6 phase can be selected according to the regular pattern, or according to the number of slots with the same slot numbers in its 6-pole A and 8-pole C: 31, 32, 49, 50, 51, 52, 53, 54, for a total of 8 slots.

[0075] According to this method, the six basic units of V6 phase and W6 in the six poles are found respectively, and U6, V6, and W6 each have three basic units such as Figure 6 shown.

[0076] Figure 6 As shown, U6, V6, and W6 each contain 3 basic units, which can form a winding style with 1 or 3 parallel branches.

[0077] From the basic units of U6, V6, and W6, find the three basic units of U8, V8, and W8 respectively, such as Figure 7(The slot number still retains its Figure 6 in the order of ).

[0078] Figure 7 As shown, U8, V8, and W8 each contain 3 basic units and are Figure 6 The basic units are the same, but only the arrangement order of the basic units is different, and winding styles with 1 or 3 parallel branches can also be formed.

[0079] Figure 8 The figure shows the 3Y / 3Y wiring method of the 6 / 8 pole 72 slot pole-changing dual-speed motor winding.

[0080] The above basic examples of the present invention and their further optional examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection by the present invention. In the scheme of the present invention, each optional example can be arbitrarily combined with any other basic examples and optional examples.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A 120° phase-changeable double-speed single winding connection method, the winding is a three-phase winding, characterized in that: S1. Each slot number represents a coil, and the star-shaped vector diagrams of two pole numbers are drawn using the 120° phase belt method; S2. Compare the star vector diagram to find the same slot number in A of one pole number and A of another pole number, and the same slot numbers form a basic unit; S3. Repeat S2 to find the basic units in B and C respectively; S4. According to the basic unit rule, the remaining slot numbers in A are arranged in sequence to find the basic unit of the remaining slot numbers; S5. Repeat S4 to find the basic units of the remaining slot numbers in B and C respectively.

2. The 120° phase-changeable double-speed single winding connection method according to claim 1 is characterized in that: In S4, when the basic unit pattern is not obvious, A in the star-shaped vector diagram with a small number of poles is compared with B and C in the star-shaped vector diagram with a large number of poles to find the same slot number, so as to determine the basic unit of the remaining slot number in the star-shaped vector diagram with a small number of poles.

3. The 120° phase-changeable double-speed single winding connection method according to claim 1 is characterized in that: Each slot number in the star vector diagram represents a coil under a pair of magnetic poles.

4. The 120° phase-changeable double-speed single winding connection method according to claim 1 is characterized in that: Each basic unit contains the same number of slots.

5. The 120° phase-band pole-changing double-speed single winding connection method according to claim 1 or 4, characterized in that: Each phase contains the same number of basic units.

6. The 120° phase-changeable double-speed single winding connection method according to claim 5 is characterized in that: Each phase consists of three basic units.

7. The 120° phase-changeable double-speed single winding connection method according to claim 1 is characterized in that: The basic units are connected in parallel and / or in series to form various styles of pole-changing double-speed single windings.

8. The 120° phase-band pole-changing double-speed single winding connection method according to claim 1 or 7, characterized in that: The A-phase basic unit forms a U-phase winding with a pole number; the B-phase basic unit forms a V-phase winding with a pole number; the C-phase basic unit forms a W-phase winding with a pole number; changing the order of the basic unit group will form another pole number of U-phase, V-phase, and W-phase.

9. The 120° phase-changeable double-speed single winding connection method according to claim 1 is characterized in that: The basic unit has two pole numbers and the winding connections in the basic unit are the same.

10. The 120° phase-changeable double-speed single winding connection method according to claim 1 or 9, characterized in that: The winding is a double-layer three-phase winding with all coils having the same pitch.

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