CN111478538A - Stator-rotor device with formed warped multi-turn helical winding - Google Patents

Abstract

The invention relates to a stator and rotor device with shaped warped multi-turn helical windings in the field of motor technology, comprising an outer rotor, an inner rotor and a stator; the outer rotor is composed of an outer rotor iron core and an outer rotor magnetic steel; the inner rotor is composed of an inner rotor It consists of iron core and inner rotor magnetic steel; the stator consists of stator iron core, stator winding, winding support plate, winding separator, and crimping terminal; The longitudinal section and cross section of the entire stator winding are in the shape of a trapezoid with a long top and a short bottom; the winding support plate is in the shape of a fishbone and is arranged between the two stator windings; The stator windings are the same. In the present invention, the stator winding adopts the formed warped multi-turn spiral winding, the winding support plate is positioned between each turn, and the direct cooling oil passage is formed between the turns, and the direct cooling is formed by the direct cooling of the cooling medium. The invention solves the problems that the traditional heat dissipation bottleneck causes the power density to be unable to be increased and the motor cost is too high.

Description

Stator-rotor device with formed warped multi-turn helical winding

technical field

The invention relates to a stator-rotor device in the technical field of electric motors, in particular to a stator-rotor device with a shaped warped multi-turn helical winding whose stator adopts direct oil cooling.

Background technique

Drive motors are mainly divided into DC motors, AC motors and hub motors; among them, DC and AC motors can be further divided. At present, the industry has paid more attention to AC asynchronous motors, permanent magnet synchronous motors and switched reluctance motors. Axial flux permanent magnet synchronous motors have significant advantages, such as high torque density, extremely short axial length, and high efficiency, but their mechanical structure design and manufacture are still very difficult. Because the heat of the traditional motor windings is thermally conducted through the external local small area of each wire, the thermal resistance is large, and the temperature gradient must be large in order to balance the heat dissipation. And because the traditional cooling water jacket needs to contact the stator core and conduct heat to the winding through the core, the thermal resistance of the stator further increases the temperature gradient, which is also a heat dissipation problem and bottleneck.

In the prior art, there is no better technology to solve the heat dissipation problem of the axial flux permanent magnet synchronous motor.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention proposes a stator and rotor device with a shaped warped multi-turn helical winding, which can effectively solve the problem of heat dissipation of the motor.

The present invention is realized by the following technical solutions. The present invention includes an outer rotor, an inner rotor and a stator; the outer rotor is composed of an outer rotor iron core and an outer rotor magnetic steel; the inner rotor is composed of an inner rotor iron core and an inner rotor magnetic steel; The stator is composed of stator iron core, stator winding, winding support plate, winding separator, and crimping terminal; the stator winding is a formed warped multi-turn helical structure, and the winding is a flat wire. The longitudinal and transverse sections of the entire stator winding are On the whole, they are trapezoidal with long upper and lower short; the winding support plate is fishbone-shaped and arranged between two stator windings to support the stator winding and form a cooling channel; the winding separators are arranged at the front and rear ends of the stator windings, The depth is the same as that of the stator winding, which is used to form the cooling medium inlet and outlet channels on both sides of the stator winding; the crimping terminals are respectively arranged at the head and tail ends of the stator winding.

Further, in the present invention, the space between each turn of the stator winding serves as a cooling medium circulation channel.

Furthermore, in the present invention, the pitch between each turn of the stator winding gradually decreases from bottom to top.

Furthermore, in the present invention, the cross-sectional area of each turn of the stator winding is equal.

Further, in the present invention, the stator winding is a mold forming part

Further, in the present invention, the outer rotor is axially and circumferentially positioned on the intermediate shaft through the outer rotor bracket, the inner rotor is integrated on the intermediate shaft through keys and end locking screws, and the stator is fixed to the motor housing through the stator bracket. body.

Compared with the prior art, the present invention has the following beneficial effects: first, the same power, smaller volume, lower material and lower cost; second, better temperature performance; third, lower electromagnetic noise; Fourth, the end is short, saving copper, and the efficiency is high.

Description of drawings

1 is a schematic structural diagram of Embodiment 1 of the present invention;

Fig. 2 is a partial enlarged view of Fig. 1;

Fig. 3 is a partial enlarged view of Fig. 2;

4 is a schematic structural diagram of a stator winding in Embodiment 1 of the present invention;

Fig. 5 is a partial enlarged view of the left side of Fig. 4;

Fig. 6 is a partial enlarged view of the right side of Fig. 4;

Fig. 7 is the side view of Fig. 4;

Fig. 8 is the structural representation of A-A section in Fig. 7;

Fig. 9 is a partial enlarged view of Fig. 8;

Among them: 1. Outer rotor iron core, 2. Outer rotor magnetic steel, 3. Stator iron core, 4. Stator winding, 5. Inner rotor iron core, 6. Inner rotor magnetic steel, 7. Winding separator, 8. Winding The support plate, 9, the first crimp terminal, 10, the second crimp terminal.

Detailed ways

The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The present embodiment is based on the technical solution of the present invention, and provides detailed implementation modes and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments. .

Example 1

1 to 9, the present invention includes an outer rotor iron core 1, an outer rotor magnetic steel 2, a stator iron core 3, a stator winding 4, an inner rotor iron core 5, an inner rotor magnetic steel 6, and a winding separator. 7. The winding support plate 8, the first crimping terminal 9, the second crimping terminal 10, the outer rotor iron core 1, the outer rotor magnetic steel 2 constitute the outer rotor, the inner rotor iron core 5, the inner rotor magnetic steel 6 constitute the inner rotor , the stator core 3, the stator winding 4, the winding separator 7, the winding support plate 8, the first crimp terminal 9, and the second crimp terminal 10 form the stator, and the outer rotor is axially positioned on the intermediate shaft through the outer rotor bracket. On the upper side, the inner rotor is integrated on the intermediate shaft through keys and end locking screws, and the stator is fixed on the motor casing through the stator bracket; The longitudinal section and cross section of the entire stator winding 4 are in the shape of a trapezoid with a long top and a short bottom; the winding support plate 8 is in the shape of a fishbone and is arranged between the two stator windings 4 to support the stator winding 4 and form lubricating oil. The winding separators 7 are respectively arranged at the front and rear ends of the stator winding 4, and the depth is the same as that of the stator winding 4, which is used to form the oil inlet and outlet circuits on both sides of the stator winding 4; the first crimping terminal 9 and the second crimping terminal 10 are arranged respectively. At the head and tail ends of the stator winding 4; the spacing between the turns of the stator winding 4 is equal, the pitch between the turns of the stator winding 4 gradually decreases from bottom to top, and the turns of the stator winding 4 are wound. The cross-sectional area of is equal, and the stator winding 4 is a molded part of the abrasive tool; the cooling medium is oil.

It can be seen from FIG. 2 and FIG. 3 that the winding support plate 8 is in the shape of a fishbone. As can be seen from FIG. 4 , the stator winding 4 is a shape-warped multi-turn helical structure, and the winding is a flat wire. It can be seen from FIG. 5 and FIG. 6 that the spacing between the turns of the stator winding 4 is equal, and the pitch between the turns of the stator winding 4 gradually decreases from bottom to top. It can be seen from FIG. 7 and FIG. 8 that the longitudinal section and the transverse section of the entire stator winding 4 are in the shape of a trapezoid with a long top and a short bottom as a whole. As can be seen from FIG. 9 , the cross-sectional areas (hatched portions) of the respective turns of the stator winding 4 are equal.

In the present invention, the winding separators 7 are respectively arranged at the front and rear ends of the stator windings 4. The winding separators 7, the upper and lower turns of winding, and the left and right winding support plates 8 form a set of oil inlet and return oil passages. The winding separators 7 One side is the oil inlet oil passage, and the other side of the winding separator 7 is the oil return oil passage. A direct cooling oil passage is formed between the turns, and the direct cooling is formed by the direct cooling of the cooling oil, which solves the problems that the power density cannot be increased and the motor cost is too high due to the traditional heat dissipation bottleneck.

The present invention has the same power, smaller volume, lower material and lower cost; or the same volume, the tank full rate is improved, and the power density is improved. The winding is changed from a round wire to a flat wire. In theory, under the premise of the same space, the flat wire electronics can achieve a 70% slot full rate, and the filled copper can be increased by 20-30%, resulting in a stronger Magnetic field strength, which is equivalent to increasing power by 20-30% in some opinions.

In the present invention, the internal gap becomes smaller, the contact area between the flat wires becomes larger, and the heat dissipation and heat conduction are better; the contact between the winding and the iron core slot is better, and the heat conduction is better. The motor is very sensitive to heat dissipation and temperature, the heat dissipation becomes better, and the performance will be improved. Through the temperature field simulation, it is concluded that the winding temperature rise of the flat copper wire motor with the same design is 10% lower than that of the round copper wire motor. Therefore, the temperature performance of the present invention is better.

In the present invention, the wire of the flat wire motor has relatively large stress and relatively high rigidity, the armature has better rigidity, and has a simulated effect on the armature noise; a relatively small notch size can be used to effectively reduce the cogging moment. , to further reduce the electromagnetic noise of the motor.

For traditional round wire motors, due to process problems, the ends of the motors are generally left relatively long, otherwise it is easy to damage the copper wire during the process. For flat wire motors, because the wires are all hard wires, the ends can be made smaller during processing. Compared with the round wire motors, the end size is reduced by 20%, the space is further reduced, and the volume of the system can be further reduced. Shrink, realize miniaturization and light weight.

Example 2

In Embodiment 1, the inner rotor magnetic steel 6 is arranged symmetrically and obliquely. In this embodiment, the inner rotor magnetic steel 6 can be designed to be arranged in an array type flat.

In Embodiment 1, the spacing between the turns of the stator winding 4 is equal, and the pitch between the turns of the stator winding 4 gradually decreases from bottom to top. The longitudinal and cross sections of the entire stator winding 4 As a whole, they are all trapezoidal shapes with a long top and a short bottom, and the cross-sectional area (hatched portion) of each turn of the stator winding 4 is equal. In this embodiment, the spacing between the turns of the stator winding 4 is not equal, and can be gradually increased from bottom to top, and the cross-sectional area (slashed portion) of each turn of the stator winding 4 is from bottom to top Gradually increasing, the longitudinal and transverse sections of the entire stator winding 4 are generally non-trapezoidal in shape. An interference fit is adopted between the winding support plate 8 and the stator winding 4 .

In Embodiment 1, the cooling medium is oil, and in this embodiment, the cooling medium is water.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various variations or modifications within the scope of the claims, which do not affect the essential content of the present invention.

Claims (6)

1. a stator-rotor device with a forming warped sheet type multi-turn helical winding, characterized in that it comprises an outer rotor, an inner rotor and a stator; The outer rotor is composed of an outer rotor iron core and an outer rotor magnetic steel; The inner rotor is composed of inner rotor iron core and inner rotor magnetic steel; The stator is composed of a stator iron core, a stator winding, a winding support plate, a winding separator, and a crimping terminal; The stator winding is of a multi-turn helical structure with a warped sheet type, the winding is a flat wire, and the longitudinal section and the cross section of the entire stator winding are in the shape of a trapezoid with a long top and a short bottom as a whole; The winding support plate is fishbone-shaped, arranged between the two stator windings, used to support the stator windings and form a cooling channel; The winding separators are respectively arranged at the front and rear ends of the stator winding, and the depth is the same as that of the stator winding, and is used to form the cooling medium inlet and outlet channels on both sides of the stator winding; The crimping terminals are respectively arranged at the head and tail ends of the stator windings. 2 . The stator and rotor device with shaped warped multi-turn helical windings according to claim 1 , wherein the space between the turns of the stator winding is used as a cooling medium circulation channel. 3 . 3 . The stator and rotor device with shaped warped multi-turn helical windings according to claim 2 , wherein the pitch between each turn of the stator winding gradually decreases from bottom to top. 4 . 4 . The stator and rotor device with shaped warped multi-turn helical windings according to claim 3 , wherein the cross-sectional area of each turn of the stator winding is equal. 5 . 5 . The stator and rotor device with shaped warped multi-turn helical windings according to claim 3 , wherein the stator windings are molded parts. 6 . 6 . The stator and rotor device with shaped warped multi-turn helical winding according to claim 1 , wherein the outer rotor is axially and circumferentially positioned on the intermediate shaft by an outer rotor bracket, and the inner rotor is axially positioned on the intermediate shaft. 7 . It is integrated on the intermediate shaft through a key and an end locking screw, and the stator is fixed on the motor housing through a stator bracket.

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