CN112087086A - Short-pitch motor stator - Google Patents

Abstract

The invention provides a short-pitch motor stator, which includes an iron core and stator windings. The iron core is provided with 48 stator slots, and insulating paper is arranged in the stator slots, and the insulating paper connects the stator slots. The iron core is divided into a first layer, a second layer, a third layer and a fourth layer in turn from the outside to the inside in the radial direction. The stator winding has eight magnetic poles and is a six-phase winding. The stator winding is a six-phase winding. Each phase includes a first winding coil, a second winding coil, a third winding coil and a fourth winding coil respectively wound on the iron core for one turn. The stator winding of the present invention has a relatively compact structure, and helps to reduce the height of the end of the winding, thereby reducing the volume of the motor without changing the power. A variety of controllers are used to optimize the performance and cost of the motor system, and can improve the efficiency and torque density of the motor. At the same time, it has the characteristics of strong fault tolerance and high reliability.

Description

A short pitch motor stator

technical field

The invention relates to an internal part of a motor, in particular to a stator of a short-pitch motor.

Background technique

With the rapid development of automotive technology, especially electric vehicle technology, the power requirements for automotive motors are also increasing, and the increase in power will inevitably lead to an increase in the volume of the motor; however, various devices on the current car are also becoming more and more The installation position provided to the motor is becoming more and more narrow and crowded. In the limited space, the power of the existing motor can no longer meet the demand. Therefore, the contradiction between the size and power of the motor has become a technology for the development of high-power motors. problem.

The Chinese utility model patent with publication number CN205453323U discloses a motor stator using flat copper wires. By using flat copper wires instead of traditional round copper wires, the slot filling rate of the motor stator is greatly improved, and the structure is compact after winding. And the output power is high, which can solve the contradiction between the volume and power of the motor to a certain extent, but it still needs to be further improved to meet more vehicle installation requirements. At the same time, because the stator of the motor adopts three-phase windings, the selection range of voltage and current is relatively narrow, and the fault tolerance rate and reliability are relatively low.

In view of this, the inventors of the present invention have conducted in-depth research on the above-mentioned problems, resulting in the present case.

SUMMARY OF THE INVENTION

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

In order to achieve the above purpose, the motor stator of the present invention adopts the following technical solutions:

A short-pitch motor stator, comprising an iron core and stator windings wound on the iron core, the iron core is provided with 48 stator slots at equal intervals, and characterized in that the stator slots are provided with insulation The insulating paper divides the stator slots into a first layer, a second layer, a third layer and a fourth layer in order from the outside to the inside in the radial direction of the iron core, and the stator winding has eight The magnetic pole 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 around the iron core for one turn;

In the same phase, the head ends of the first winding coil and the third winding coil both form lead wires, and the tail ends of the second winding coil and the fourth winding coil both form a neutral point connection line , the two neutral point connecting lines are connected in parallel; the tail end of the first winding coil is connected with the head end of the second winding coil and the two winding directions are the same, and the tail end of the third winding coil is connected It is connected to the head end of the fourth winding coil, and the winding directions of both are opposite to that of the first winding coil; the winding end of the first winding coil is located in the fourth corresponding stator slot. The winding end of the second winding coil is located in the second layer of the corresponding stator slot, and the winding end of the third winding is located in the first layer of the corresponding stator slot, so The starting end of the fourth winding coil is located on the third layer of the corresponding stator slot.

As an improvement of the present invention, the first winding coil and the second winding coil are adjacent to the stator slot where the winding ends are located, and the starting winding of the third winding coil and the second winding coil are The stator slots where the ends 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 the two stator slots wound by the same coil are separated by five of the stator slots.

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

As an improvement of the present invention, the starting end of the first winding coil in each phase is used as the starting end of the corresponding phase, and the six-phase windings of the stator winding are respectively arranged in a clockwise or counterclockwise order from the starting ends. U-phase windings, A-phase windings, V-phase windings, B-phase windings, W-phase windings, and C-phase windings, wherein the stator slots where the winding ends of the U-phase windings are located and the windings of the A-phase windings The stator slots where the winding ends are located are adjacent, the stator slots where the starting ends of the V-phase windings are located are adjacent to the stator slots where the starting ends of the B-phase windings are located, and the W-phase windings are adjacent to each other. The stator slot where the winding end is located is adjacent to the stator slot where the winding end of the C-phase winding is located, and the stator slot where the winding end of the U-phase winding is located is adjacent to the V-phase winding. There are three spaces between the stator slots where the winding ends are located, the stator slots where the winding ends of the V-phase windings are located, and the stator slots where the winding ends of the W-phase windings are located. Describe the stator slot.

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 A-phase winding, the B-phase winding and the The neutral point connecting lines of the C-phase windings are connected to each other.

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 comprise more than one wire with an oval or square cross section.

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.

Adopting the above-mentioned technical scheme, the present invention has the following beneficial effects:

1. Using the stator winding of the present invention, the structure is relatively compact, and it is helpful to reduce the height of the end of the winding, thereby reducing the volume of the motor without changing the power, so as to achieve high power and relatively small volume. The 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 has the characteristics of strong fault tolerance and high reliability.

2. By using a wire with an oval or square cross-section, it can effectively improve the full rate of the motor stator slot, improve the material utilization rate of the stator, thereby reducing the copper consumption of the motor and improving the efficiency of the motor, which can effectively reduce the motor winding coil. End height, thus saving the volume of the motor.

3. The connection structure of the neutral point connecting line adopted in the present invention is helpful to further improve the efficiency and torque density of the motor.

4. The stator winding provided by the present invention helps to improve the magnetic field harmonics of the motor, reduce the torque fluctuation and improve the motor through the dislocation arrangement of the first winding coil, the second winding coil and the third winding coil and the fourth winding coil. s efficiency.

Description of drawings

Fig. 1 is the partial structure schematic diagram of the iron core in the embodiment;

Fig. 2 is the expanded structure schematic diagram of U-phase winding and A-phase winding in the embodiment;

3 is a schematic view of the unfolded structure of the V-phase winding and the B-phase winding in the embodiment;

4 is a schematic diagram of the unfolded structure of the W-phase winding and the C-phase winding in the embodiment;

5 is a schematic diagram of the connection structure of the neutral point connecting lines of the U-phase winding, the V-phase winding and the W-phase winding in the embodiment;

FIG. 6 is a 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.

The corresponding symbols in the figure are as follows:

100-iron core; 110-stator slot;

210-first winding coil; 220-second winding coil;

230 - the third winding coil; 240 - the fourth winding coil.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in FIGS. 1-6 , this embodiment provides a short-pitch motor stator, where the short-pitch means that the pitch of the stator windings of the motor stator is smaller than the pole pitch. Save and power factor is higher. The short-pitch motor stator provided in this embodiment includes an iron core 100 and stator windings wound on the iron core. The iron core 100 is provided with 48 stator slots 110 at equal intervals, and the shape of the stator slots 110 may be conventional shape, such as a rectangular slot, each stator slot 110 is provided with insulating paper, and the insulating paper is also the insulating paper used for the conventional motor stator. It is divided into the first layer, the second layer, the third layer and the fourth layer, and each layer is used to wind the sub-coil, that is, a slot with four wires. In order to distinguish each stator slot 110 at different positions, in this embodiment, starting from any stator slot 110 , the stator slots 110 are numbered counterclockwise from the first slot to the 72nd slot. The number of the stator slot 110 and the part number of the motor stator. In this embodiment and the accompanying drawings 1 to 6 , the three-digit number represents the part number of the motor stator, and the one-digit and two-digit numbers represent the stator. Number of slot 110.

The stator winding has eight magnetic poles and is a six-phase winding. The six-phase windings of the stator winding are U-phase windings, A-phase windings, V-phase windings, B-phase windings, and W-phase windings arranged clockwise or counterclockwise at the starting end. winding and C-phase winding.

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 wound on the iron core 100 for one turn. In the same phase, the first winding coil 210 and the first ends of the third winding coil 230 form lead wires, the tail ends of the second winding coil 220 and the fourth winding coil 240 both form a neutral point connection line, and the tail end of the first winding coil 210 and the second winding coil The head ends of the coils 220 are connected and the two are wound in the same direction (counterclockwise in this embodiment). are opposite to the first winding coil 210 (ie, clockwise); for ease of expression, it is assumed that the first windings of the U-phase winding, A-phase winding, V-phase winding, B-phase winding, W-phase winding and C-phase winding are connected in series with each other. The coil 210 and the second winding coil 220 are U1, A1, V1, B1, W1 and C1 in sequence. The U-phase winding, A-phase winding, V-phase winding, B-phase winding, W-phase winding and C-phase winding are connected in series with each other. The third winding coil 230 and the fourth winding coil 240 are U2, A2, V2, B2, W2 and C2 in sequence. Each winding coil is formed by welding each other through hairpin plug-ins, and the winding coils connected in series are connected by cross wires, and the coils formed by mutual welding of hairpin plug-ins are widely used in various types of vehicle motor stators, which is not the focus of this embodiment. It will not be described in detail here.

Preferably, the first winding coil 210, the second winding coil 220, the third winding coil 230 and/or the fourth winding coil 240 include more than one wire with an oval or square cross-section. It is a flat copper wire, that is, a copper wire with an oval or square cross-section. The flat copper wire is easy to install, has good stability, and is beneficial to improve the slot full rate of the stator winding. In addition, each lead wire and each neutral point connecting wire are located on the same side of the iron core 100, which is convenient for connection.

The starting end of the first winding coil 210 (that is, the position wound in the stator slot 110 and directly connected to the lead wire) is located on the fourth layer of the corresponding stator slot 110, and the starting end of the second winding coil (ie the head end) ) is located on the second layer of the corresponding stator slot 110 , the starting end of the third winding (that is, the position that is wound in the stator slot 110 and is directly connected to the lead wire) is located on the first layer of the corresponding stator slot 100 , and the fourth The starting end (ie the head end) of the winding coil is located on the third layer of the corresponding stator slot 110 . Preferably, in the same phase, the stator slots 110 where the starting ends of the first winding coil 210 and the second winding coil 220 are located are adjacent (that is, there is no other stator slot 110 between the two stator slots 110 ), and the third winding coil 230 and the second winding coil 220 are located in the same stator slot 110, the fourth winding coil 240 and the first winding coil 210 are located in the same stator slot 110, and the two stator slots are wound by the same coil Five stator slots 110 are spaced between 110 . Further, the first winding coil 210 and the fourth winding coil 240 are alternately wound on the fourth and third layers of the corresponding stator slots 110, respectively, and the second winding coil 220 and the third winding coil 230 are alternately wound on the corresponding The second and first layers of the stator slots 110. In addition, with 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 winding end of the V-phase winding is located is adjacent to the stator slot 110 where the winding end of the B-phase winding is located, and the stator slot 110 where the winding end of the W-phase winding is located and the winding end of the C-phase winding are located The stator slots 110 are adjacent to each other, 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, and between the stator slot 110 where the starting end of the V-phase winding is located and the W-phase winding Three stator slots 110 are spaced between the stator slots 110 where the winding ends of the windings are located.

Specifically in this embodiment, U1 is wound in a counterclockwise direction, and its winding end (that is, the corresponding winding end of the first winding coil 210 ) is located on the fourth layer of the ninth slot, and its winding stop end (that is, is wound at the The position in the stator slot 110 and directly connected to the neutral point connection line) is located on the first layer of the second slot, U2 is wound clockwise, and its winding end is located on the first layer of the eighth slot, and its winding stop end is located on the 15th On the fourth layer of the slot, A1 is wound counterclockwise, and its winding end is located on the fourth layer of the 8th slot, and its winding stop end is on the first layer of the first slot, and A2 is wound clockwise, and its winding end is located in the seventh slot. For the first layer, its winding stop end is located on the fourth layer of the 14th slot, V1 is wound counterclockwise, and its winding end is located on the fourth layer of the 13th slot, then its winding stop end is located on the first layer of the 6th slot, and V2 runs along the Clockwise winding, its winding end is located on the first floor of the 12th slot, then its winding stop end is on the 19th slot fourth floor, B1 is wound counterclockwise, and its winding end is on the 12th slot fourth floor, then its stop The winding end is located on the first layer of the 5th slot, B2 is wound clockwise, and its winding end is located on the first layer of the 11th slot, then its winding stop end is located on the fourth layer of the 18th slot, and W1 is wound counterclockwise, and its winding The end is located in the fourth layer of the 17th slot, then its winding stop end is located in the 10th slot first layer, W2 is wound clockwise, and its winding end is in the 16th slot first layer, then its winding stop end is in the 23rd slot. Four layers, C1 is wound counterclockwise, and its winding end is located at the fourth layer of the 16th slot, then its winding stop end is located at the first layer of the 9th slot, and C2 is wound clockwise, and its winding end is located at the first layer of the 15th slot. layer, the winding stop end is located on the fourth layer of the 22nd slot.

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

The present invention has been described in detail above in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited to the above-mentioned embodiments. Those skilled in the art can make various modifications to the present invention according to the prior art, which all belong to the protection scope of the present invention. .

Claims (7)

1. A short-pitch motor stator comprises an iron core and a stator winding wound on the iron core, wherein 48 stator slots are formed in the iron core at equal intervals, and the short-pitch motor stator is characterized in that insulating paper is arranged in the stator slots and divides the stator slots into a first layer, a second layer, a third layer and a fourth layer from outside to inside in sequence in the radial direction of the iron core, the stator winding is provided with 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 which are respectively wound on the iron core;

in the same phase, leading-out wires are formed at the head ends of the first winding coil and the third winding coil, neutral point connecting wires are formed at the tail ends of the second winding coil and the fourth winding coil, and the two neutral point connecting wires are connected in parallel; the tail end of the first winding coil is connected with the head end of the second winding coil, the winding directions of the first winding coil and the second winding coil are the same, the tail end of the third winding coil is connected with the head end of the fourth winding coil, and the winding directions of the third winding coil and the fourth winding coil are opposite to those of the first winding coil; the winding end of the first winding coil is located in the fourth layer of the corresponding stator slot, the winding end of the second winding coil is located in the second layer of the corresponding stator slot, the winding end of the third winding coil is located in the first layer of the corresponding stator slot, and the winding end of the fourth winding coil is located in the third layer of the corresponding stator slot.

2. The short-pitch motor stator according to claim 1, wherein the stator slots in which the winding ends of the first winding coil and the second winding coil are located are adjacent to each other, the stator slots in which the winding ends of the third winding coil and the second winding coil are located are the same, the stator slots in which the winding ends of the fourth winding coil and the first winding coil are located are the same, and five stator slots are provided between two stator slots wound by the same coil.

3. The short-pitch motor stator as claimed in claim 1 or 2, wherein said first winding coil and said fourth winding coil are alternately wound on said fourth layer and said third layer of each of said stator slots, respectively, and said second winding coil and said third winding coil are alternately wound on said second layer and said first layer of said stator slot, respectively.

4. The short-pitch motor stator according to claim 3, wherein the winding end of the first winding coil in each phase is the winding end of the corresponding phase, and the six-phase windings of the stator winding are respectively a U-phase winding, an A-phase winding, a V-phase winding, a B-phase winding, a W-phase winding and a C-phase winding, wherein the winding end of the U-phase winding is located in the stator slot adjacent to the winding end of the A-phase winding, the winding end of the V-phase winding is located in the stator slot adjacent to the winding end of the B-phase winding, the winding end of the W-phase winding is located in the stator slot adjacent to the winding end of the C-phase winding, the winding end of the U-phase winding is located between the stator slot and the winding end of the V-phase winding, and the winding end of the V-phase winding is located in the stator slot Three stator slots are arranged between the slot and the stator slot where the winding end of the W-phase winding is located at intervals.

5. The short-pitch motor stator according to claim 4, wherein 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.

6. A short pitch motor stator according to claim 3, wherein the first winding coil, the second winding coil, the third winding coil and/or the fourth winding coil comprises one or more conductive wires having an elliptical or square cross section.

7. A short-pitch motor stator according to claim 3, wherein each of said outgoing lines and each of said neutral point connecting lines are located on the same side of said core.

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