A short pitch motor stator

Abstract

The present invention provides a short-pitch motor stator, including an iron core and a stator winding, wherein the iron core is provided with 48 stator slots, and insulating paper is arranged in the stator slots, and the insulating paper sequentially separates the stator slots into a first layer, a second layer, a third layer and a fourth layer from the outside to the inside in the radial direction of the iron core, and the stator winding has eight magnetic poles and is a six-phase winding, and each phase of the stator winding includes a first winding coil, a second winding coil, a third winding coil and a fourth winding coil respectively wound on the iron core. The stator winding of the present invention has a relatively compact structure, and helps to reduce the end height of the winding, thereby reducing the volume of the motor without changing the power. In addition, the use of a six-phase winding can expand the selection range of voltage and current, adapt to a variety of controllers, thereby optimizing the performance and cost of the motor system, and can improve the efficiency and torque density of the motor, and at the same time has the characteristics of strong fault tolerance and high reliability.

Description

Technical Field

[0001] The invention relates to an internal part of a motor, in particular to a short-pitch motor stator. Background Art

[0002] With the rapid development of automobile technology, especially electric vehicle technology, the power requirements for automotive electric motors are also increasing. The increase in power will inevitably lead to an increase in the size of the motor. However, there are more and more various devices on current cars, and the installation locations provided for electric motors are becoming increasingly narrow and crowded. In a limited space, the power of existing electric motors can no longer meet the demand. Therefore, the contradiction between the size and power of electric motors has become a technical problem in the research and development of high-power electric motors.

[0003] The Chinese utility model patent with publication number CN205453323U discloses a motor stator using flat copper wire, which greatly improves the slot fill rate of the motor stator by replacing the traditional round copper wire with flat copper wire. After winding, the structure is compact and the output power is high. To a certain extent, it can solve the contradiction between the size and power of the motor, but it still needs further improvement to meet more vehicle installation requirements. At the same time, because the motor stator uses a three-phase winding, the selection range of voltage and current is relatively narrow, and the fault tolerance and reliability are relatively low.

[0004] In view of this, the inventor conducted an in-depth study on the above-mentioned problem, and thus the present invention was produced. Summary of the invention

[0005] The object of the present invention is to provide a full-pitch motor stator with relatively large power and relatively small volume, relatively wide voltage and current selection range, and relatively high fault tolerance and reliability.

[0006] In order to achieve the above object, the motor stator of the present invention adopts the following technical solution:

[0007] A short-pitch motor stator, comprising an iron core and a stator winding wound on the iron core, wherein 48 stator slots are evenly spaced on the iron core, and characterized in that insulating paper is arranged in the stator slots, and the insulating paper sequentially separates the stator slots into a first layer, a second layer, a third layer and a fourth layer from the outside to the inside in the radial direction of the iron core, the stator winding has eight magnetic poles and is a six-phase winding, and each phase of the stator winding comprises a first winding coil, a second winding coil, a third winding coil and a fourth winding coil respectively wound one circle on the iron core;

[0008] In the same phase, the first ends of the first winding coil and the third winding coil both form lead-out wires, the tail ends of the second winding coil and the fourth winding coil both form neutral point connecting lines, and the two neutral point connecting lines are connected in parallel; the tail end of the first winding coil is connected to the head end of the second winding coil, and the two are wound in the same direction, the tail end of the third winding coil is connected to the head end of the fourth winding coil, and the winding directions of the two are opposite to those of the first winding coil; the starting end of the first winding coil is located at the fourth layer of the corresponding stator slot, the starting end of the second winding coil is located at the second layer of the corresponding stator slot, the starting end of the third winding is located at the first layer of the corresponding stator slot, and the starting end of the fourth winding coil is located at the third layer of the corresponding stator slot.

[0009] As an improvement of the present invention, the stator slots where the starting ends of the first winding coil and the second winding coil are located are adjacent, the stator slots where the starting ends of the third winding coil and the second winding coil are located are the same, the stator slots where the starting ends of the fourth winding coil and the first winding coil are located are the same, and five stator slots are separated between two stator slots wound by the same coil.

[0010] As an improvement of the present invention, the first winding coil and the fourth winding coil are respectively alternately wound on the fourth layer and the third layer of the corresponding stator slots, and the second winding coil and the third winding coil are respectively alternately wound on the second layer and the first layer of the corresponding stator slots.

[0011] As an improvement of the present invention, with the starting end of the first winding coil in each phase as the starting end of the corresponding phase, the six-phase windings of the stator winding are respectively U-phase winding, A-phase winding, V-phase winding, B-phase winding, W-phase winding and C-phase winding, with the starting ends arranged in sequence clockwise or counterclockwise, wherein the stator slot where the starting end of the U-phase winding is located is adjacent to the stator slot where the starting end of the A-phase winding is located, the stator slot where the starting end of the V-phase winding is located is adjacent to the stator slot where the starting end of the B-phase winding is located, the stator slot where the starting end of the W-phase winding is located is adjacent to the stator slot where the starting end of the C-phase winding is located, and there are three stator slots between the stator slot where the starting end of the U-phase winding is located and the stator slot where the starting end of the V-phase winding is located, and between the stator slot where the starting end of the V-phase winding is located and the stator slot where the starting end of the W-phase winding is located.

[0012] As an improvement of the present invention, the neutral point connecting lines of the U-phase winding, the V-phase winding and the W-phase winding are connected to each other, and the neutral point connecting lines of the A-phase winding, the B-phase winding and the C-phase winding are connected to each other.

[0013] As an improvement of the present invention, the first winding coil, the second winding coil, the third winding coil and / or the fourth winding coil include at least one wire with an elliptical or square cross-section.

[0014] As an improvement of the present invention, each of the lead wires and each of the neutral point connecting wires are located on the same side of the iron core.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects:

[0016] 1. The stator winding of the present invention has a compact structure and helps to reduce the end height of the winding, thereby reducing the volume of the motor without changing the power, achieving high power and relatively small volume. In addition, the use of six-phase windings can expand the selection range of voltage and current, adapt to a variety of controllers, thereby optimizing the performance and cost of the motor system, and can improve the efficiency and torque density of the motor, while having the characteristics of strong fault tolerance and high reliability.

[0017] 2. By using wires with elliptical or square cross-sections, the motor stator slot fill rate is effectively increased, the material utilization rate of the stator is improved, and the copper loss of the motor is reduced to improve the efficiency of the motor. The end height of the motor winding coil can be effectively reduced, thereby saving the volume of the motor.

[0018] 3. The connection structure of the neutral point connecting line adopted in the present invention helps to further improve the efficiency and torque density of the motor.

[0019] 4. The stator winding provided by the present invention helps to improve the magnetic field harmonics of the motor, reduce torque fluctuations and improve the efficiency of the motor through the staggered arrangement of the first winding coil and the second winding coil and the third winding coil and the fourth winding coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a partial structure of an iron core in an embodiment;

[0021] Figure 2 Schematic diagram of the expanded structure of the U-phase winding and the A-phase winding in the embodiment;

[0022] Figure 3 Schematic diagram of the expanded structure of the V-phase winding and the B-phase winding in the embodiment;

[0023] Figure 4 Schematic diagram of the expanded structure of the W-phase winding and the C-phase winding in the embodiment;

[0024] Figure 5 Schematic diagram of the connection structure of the neutral point connection lines of the U-phase winding, the V-phase winding and the W-phase winding in the embodiment;

[0025] Figure 6 Schematic diagram of the connection structure of the neutral point connecting lines of the A-phase winding, the B-phase winding and the C-phase winding in the embodiment.

[0026] The corresponding markings in the figure are as follows:

[0027] 100- iron core; 110- stator slot;

[0028] 210-a first winding coil; 220-a second winding coil;

[0029] 230 - the third winding coil; 240 - the fourth winding coil. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] like Figure 1-Figure 6 As shown, this embodiment provides a short-pitch motor stator, wherein the short pitch refers to that the pitch of the stator winding of the motor stator is smaller than the pole pitch. Due to the small pitch, the material consumption is saved and the power factor is high. The short-pitch motor stator provided in this embodiment includes an iron core 100 and a stator winding wound on the iron core, wherein 48 stator slots 110 are evenly spaced on the iron core 100, and the shape of the stator slots 110 can be a conventional shape, such as a rectangular slot, and each stator slot 110 is provided with insulating paper, which is also the insulating paper used in conventional motor stators. The insulating paper divides the corresponding stator slots into the first layer, the second layer, the third layer and the fourth layer in the radial direction of the iron core 100 from the outside to the inside, and each layer is used to wind the stator coil, that is, one slot and four wires. In order to distinguish the stator slots 110 at different positions, in this embodiment, starting from any stator slot 110, the stator slots 110 are numbered from the 1st slot to the 72nd slot in a counterclockwise direction. In addition, in order to distinguish the numbering of the stator slots 110 from the numbering of the parts of the motor stator, in this embodiment and the appended drawings, Figure 1-Figure 6 In FIG. 1 , the three-digit number indicates the part number of the motor stator, and the one-digit and two-digit numbers indicate the number of the stator slot 110 .

[0032] The stator winding has eight magnetic poles and is a six-phase winding. The six-phase windings of the stator winding are respectively arranged in clockwise or counterclockwise order: U-phase winding, A-phase winding, V-phase winding, B-phase winding, W-phase winding and C-phase winding.

[0033] Each phase of the stator winding includes a first winding coil 210, a second winding coil 220, a third winding coil 230 and a fourth winding coil 240, each of which is wound around the iron core 100. In the same phase, the first ends of the first winding coil 210 and the third winding coil 230 form lead wires, and the tail ends of the second winding coil 220 and the fourth winding coil 240 form neutral point connection lines. The tail end of the first winding coil 210 is connected to the head end of the second winding coil 220 and the two are wound in the same direction (in the present embodiment, both are counterclockwise), and the tail end of the third winding coil 230 and the fourth winding coil 240 are connected. The first end of the first winding coil 240 is connected, and the winding direction of both is opposite to that of the first winding coil 210 (i.e., clockwise); for ease of description, the first winding coil 210 and the second winding coil 220 connected in series in the U phase winding, A phase winding, V phase winding, B phase winding, W phase winding and C phase winding are U1, A1, V1, B1, W1 and C1 respectively, and the third winding coil 230 and the fourth winding coil 240 connected in series in the U phase winding, A phase winding, V phase winding, B phase winding, W phase winding and C phase winding are U2, A2, V2, B2, W2 and C2 respectively. Each winding coil is formed by welding the hairpin plug-in to each other, and the winding coils connected in series are connected by cross-wires. The coils formed by welding the hairpin plug-in to each other are widely used in various automotive motor stators, which is not the focus of this embodiment and will not be described in detail here.

[0034] Preferably, the first winding coil 210, the second winding coil 220, the third winding coil 230 and / or the fourth winding coil 240 include one or more conductors with an elliptical or square cross-section. In this embodiment, flat copper wires are used, i.e., copper wires with an elliptical or square cross-section. Flat copper wires are easy to install, have good stability, and are conducive to improving the slot fill rate of the stator winding. In addition, each lead wire and each neutral point connection wire are located on the same side of the iron core 100 for easy connection.

[0035] The starting end of the first winding coil 210 (i.e., the position wound in the stator slot 110 and directly connected to the lead wire) is located at the fourth layer of the corresponding stator slot 110, the starting end of the second winding coil (i.e., the head end) is located at the second layer of the corresponding stator slot 110, the starting end of the third winding (i.e., the position wound in the stator slot 110 and directly connected to the lead wire) is located at the first layer of the corresponding stator slot 100, and the starting end of the fourth winding coil (i.e., the head end) is located at the third layer of the corresponding stator slot 110. Preferably, in the same phase, the stator slots 110 where the winding ends of the first winding coil 210 and the second winding coil 220 are located are adjacent (i.e., there is no other stator slot 110 between the two stator slots 110), the stator slots 110 where the winding ends of the third winding coil 230 and the second winding coil 220 are located are the same, the stator slots 110 where the winding ends of the fourth winding coil 240 and the first winding coil 210 are located are the same, and there are five stator slots 110 between the two stator slots 110 wound by the same coil. Further, the first winding coil 210 and the fourth winding coil 240 are alternately wound on the fourth layer and the third layer of the corresponding stator slots 110, respectively, and the second winding coil 220 and the third winding coil 230 are alternately wound on the second layer and the first layer of the corresponding stator slots 110, respectively. In addition, taking the starting end of the first winding coil 210 in each phase as the starting end of the corresponding phase, the stator slot 110 where the starting end of the U-phase winding is located is adjacent to the stator slot where the starting end 110 of the A-phase winding is located, the stator slot 110 where the starting end of the V-phase winding is located is adjacent to the stator slot 110 where the starting end of the B-phase winding is located, the stator slot 110 where the starting end of the W-phase winding is located is adjacent to the stator slot 110 where the starting end of the C-phase winding is located, and there are three stator slots 110 between the stator slot 110 where the starting end of the U-phase winding is located and the stator slot 110 where the starting end of the V-phase winding is located, as well as between the stator slot 110 where the winding end of the V-phase winding is located and the stator slot 110 where the starting end of the W-phase winding is located.

[0036] Specifically in the present embodiment, U1 is wound counterclockwise, and its winding start end (i.e., the winding start end of the corresponding first winding coil 210) is located at the fourth layer of the 9th slot, and its winding stop end (i.e., the position wound in the stator slot 110 and directly connected to the neutral point connecting line) is located at the first layer of the 2nd slot, U2 is wound clockwise, and its winding start end is located at the first layer of the 8th slot, and its winding stop end is located at the fourth layer of the 15th slot, A1 is wound counterclockwise, and its winding start end is located at the fourth layer of the 8th slot, and its winding stop end is located at the first layer of the 1st slot, A2 is wound clockwise, and its winding start end is located at the first layer of the 7th slot, and its winding stop end is located at the fourth layer of the 14th slot, V1 is wound counterclockwise, and its winding start end is located at the fourth layer of the 13th slot, and its winding stop end is located at the first layer of the 6th slot, and V2 is wound clockwise, and its winding start end is located at the fourth layer of the 13th slot. The winding end is located at the first layer of the 12th slot, and its stop winding end is located at the fourth layer of the 19th slot. B1 is wound counterclockwise, and its starting winding end is located at the fourth layer of the 12th slot, and its stop winding end is located at the first layer of the 5th slot. B2 is wound clockwise, and its starting winding end is located at the first layer of the 11th slot, and its stop winding end is located at the fourth layer of the 18th slot. W1 is wound counterclockwise, and its starting winding end is located at the fourth layer of the 17th slot, and its stop winding end is located at the first layer of the 10th slot. W2 is wound clockwise, and its starting winding end is located at the first layer of the 16th slot, and its stop winding end is located at the fourth layer of the 23rd slot. C1 is wound counterclockwise, and its starting winding end is located at the fourth layer of the 16th slot, and its stop winding end is located at the first layer of the 9th slot. C2 is wound clockwise, and its starting winding end is located at the first layer of the 15th slot, and its stop winding end is located at the fourth layer of the 22nd slot.

[0037] like Figure 5 and Figure 6 As shown, the two neutral point connection lines in the same phase are connected in parallel, and the neutral point connection lines of the U-phase winding, the V-phase winding and the W-phase winding are connected to each other, and the neutral point connection lines of the A-phase winding, the B-phase winding and the C-phase winding are connected to each other.

[0038] The present invention is described in detail above with reference to the accompanying drawings, but the embodiments of the present invention are not limited to the above embodiments. Those skilled in the art can make various modifications to the present invention based on the prior art, which all belong to the protection scope of the present invention.

Claims

1. A short-pitch motor stator, comprising an iron core and a stator winding wound on the iron core, wherein 48 stator slots are evenly spaced on the iron core, characterized in that: Insulating paper is arranged in the stator slot, and the insulating paper divides the stator slot into a first layer, a second layer, a third layer and a fourth layer in sequence from the outside to the inside in the radial direction of the iron core. The stator winding has eight magnetic poles and is a six-phase winding. Each phase of the stator winding includes a first winding coil, a second winding coil, a third winding coil and a fourth winding coil, each of which is wound around the iron core once. In the same phase, the first and third winding coils have leading ends formed with lead wires, the second and fourth winding coils have tail ends formed with neutral point connecting lines, and the two neutral point connecting lines are connected in parallel; the tail end of the first winding coil is connected to the head end of the second winding coil, and the two winding directions are the same, the tail end of the third winding coil is connected to the head end of the fourth winding coil, and the winding directions of the two are opposite to those of the first winding coil; the winding start end of the first winding coil is located at the fourth layer of the corresponding stator slot, the winding start end of the second winding coil is located at the second layer of the corresponding stator slot, the winding start end of the third winding is located at the first layer of the corresponding stator slot, and the winding start end of the fourth winding coil is located at the third layer of the corresponding stator slot; The stator slots where the winding ends of the first winding coil and the second winding coil are located are adjacent, the stator slots where the winding ends of the third winding coil and the second winding coil are located are the same, the stator slots where the winding ends of the fourth winding coil and the first winding coil are located are the same, and there are five stator slots between two stator slots wound by the same coil; The first winding coil and the fourth winding coil are respectively alternately wound on the fourth layer and the third layer of the corresponding stator slots, and the second winding coil and the third winding coil are respectively alternately wound on the second layer and the first layer of the corresponding stator slots.

2. The short pitch motor stator according to claim 1, characterized in that: Taking the starting end of the first winding coil in each phase as the starting end of the corresponding phase, the six-phase windings of the stator winding are respectively U-phase winding, A-phase winding, V-phase winding, B-phase winding, W-phase winding and C-phase winding, whose starting ends are arranged in sequence clockwise or counterclockwise, wherein the stator slot where the starting end of the U-phase winding is located is adjacent to the stator slot where the starting end of the A-phase winding is located, the stator slot where the starting end of the V-phase winding is located is adjacent to the stator slot where the starting end of the B-phase winding is located, the stator slot where the starting end of the W-phase winding is located is adjacent to the stator slot where the starting end of the C-phase winding is located, and there are three stator slots between the stator slot where the starting end of the U-phase winding is located and the stator slot where the starting end of the V-phase winding is located, and between the stator slot where the starting end of the V-phase winding is located and the stator slot where the starting end of the W-phase winding is located.

3. The short pitch motor stator according to claim 2, characterized in that: The neutral point connection lines of the U-phase winding, the V-phase winding, and the W-phase winding are connected to each other, and the neutral point connection lines of the A-phase winding, the B-phase winding, and the C-phase winding are connected to each other.

4. The short pitch motor stator according to claim 1, characterized in that: The first winding coil, the second winding coil, the third winding coil and / or the fourth winding coil include one or more wires with an elliptical or square cross section.

5. The short pitch motor stator according to claim 1, characterized in that: Each of the lead wires and each of the neutral point connecting wires are located on the same side of the iron core.

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