CN116760210A - Cooling structure for reducing temperature rise of compound excitation motor with staggered magnetic poles - Google Patents

Abstract

The invention relates to a cooling structure for reducing the temperature rise of a composite excitation motor with staggered magnetic poles, which comprises a cooling water channel, two sections of stators and a direct-current excitation winding, wherein the direct-current excitation winding is wound in the lower concave part of the cooling water channel of the disconnection part of the two sections of stators along the circumferential direction; and the direct contact between the cooling water channel and the two sections of stators and the direct current excitation winding is realized. According to the invention, the exciting winding is arranged on the cooling water pipe, so that the direct contact between the cooling water pipe and the stator and between the cooling water pipe and the exciting winding are realized, the contact thermal resistance between the cooling water and the stator and between the cooling water pipe and the exciting winding are reduced, the cooling effect is better, the heat dissipation efficiency is higher, and the cooling water pipe is arranged at the junction of the yoke part of the stator and the magnetic-conducting back yoke, is far away from an alternating magnetic field, and has less influence on the performance of a motor even if a metal material is adopted.

Description

A cooling structure for reducing the temperature rise of staggered pole compound excitation motors

Technical field

The invention relates to a staggered magnetic pole compound excitation motor, and in particular to a staggered magnetic pole compound excitation motor water-cooling structure.

Background technique

Compared with traditional electric excitation motors and permanent magnet motors, compound excitation motors have the advantages of higher efficiency and adjustable air gap magnetic field. However, because compound excitation motors use DC auxiliary excitation windings to magnetize ferromagnetic poles to adjust the air gap magnetic field, Therefore, in addition to the AC winding, an additional DC winding is required, and it is also very important to reduce its temperature rise.

In the current cooling structure of compound excitation motors, the traditional water-cooling method is to install a water-cooled machine base outside the stator back yoke. The heat generated by the field winding and the stator core is conducted through the stator magnetic back yoke into the water-cooling structure, and is taken away by the cooling water. This Method: The heat transfer path between the cooling water, the DC excitation winding and the stator is long, the thermal resistance is large, and the efficiency is low; or holes are opened along the axial direction in the stator core, and the water-cooling tube is placed in the hole. This structure requires the stator to be The iron core is processed, and if the cooling water pipe is made of metal materials with high thermal conductivity, it will also affect the performance of the motor.

In order to solve the problem of low heat dissipation efficiency of the AC main winding and auxiliary excitation winding in the compound excitation motor, and to effectively reduce the temperature rise of the motor stator and DC auxiliary excitation winding, a new cooling structure needs to be designed.

Contents of the invention

In view of the difficulty in cooling the DC excitation winding of the existing compound excitation motor, the present invention proposes a cooling structure for reducing the temperature rise of the staggered pole compound excitation motor. This cooling structure proposes to install a cooling water pipe at the junction of the stator yoke and the stator magnetic back yoke. , the cooling water pipe has a recess in the disconnected part of the stator, and the field winding is installed in the recess of the cooling water channel. This structure can not only facilitate the installation of the field winding, but also directly cool the field winding and the motor stator core.

In order to achieve the above objects, the technical solution of the present invention is:

A cooling structure for reducing the temperature rise of a staggered pole composite excitation motor, including a cooling water channel, a two-section stator, and a DC excitation winding. The DC excitation winding is circumferentially wound around the recessed cooling water channel in the disconnected part of the two-section stator. to achieve direct contact between the cooling water channel and the two stator sections and the DC excitation winding, which is used to reduce the contact thermal resistance between the cooling water, the DC excitation winding and the two stator sections.

Furthermore, the two-section stator includes a stator core and an armature winding, which are made of laminated silicon steel sheets and embedded copper wire windings.

Furthermore, the two stator sections are disconnected at the middle position, and their conjugate parts are provided with cooling water channels.

Furthermore, the cooling water channel is inserted from the outside of the two-stage stator, and is fixed to the cooling water channel through the two-stage stator yoke cooling water channel grooves.

Furthermore, the outer circle of the cooling water channel is thermally sleeved with a magnetic conductive back yoke of the stator, which plays an axial magnetic conductive role.

Furthermore, the cooling water channel includes the same number of circular water channels as the arc grooves of the two sections of the stator core, water collection rings at both ends, water inlet and outlet pipes, and water channels with concave stator disconnection positions at both ends.

Further, the cooling water channel is a spiral water channel or a circular water channel.

The beneficial effects of the present invention are:

By placing the excitation winding on the cooling water pipe, the present invention realizes direct contact between the cooling water pipe, the stator and the excitation winding, reduces the contact thermal resistance between the cooling water, the excitation winding and the stator, has better cooling effect and higher heat dissipation efficiency. And it is installed at the junction of the stator yoke and the magnetic back yoke, which is far away from the alternating magnetic field. Even if it is made of metal material, it will have little impact on the performance of the motor.

Description of the drawings

Figure 1 shows the installation diagram of the motor stator, water channel and DC excitation winding;

Figure 2 shows the installation diagram of the stator, cooling water channel and stator magnetic back yoke;

Figure 3 is the front view of the cooling water channel;

Figure 4 is a side view of the cooling water channel;

Figure 5 is a schematic diagram of the overall flow direction of the cooling water channel;

Figure 6 is a schematic diagram of the axial flow of the cooling water channel;

In the figure: 1 is the cooling water channel; 2 is the DC excitation winding; 3 is the segmented stator one; 4 is the segmented stator two; 5 is the stator magnetic back yoke.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and examples.

As shown in Figures 1 to 6, the cooling structure of the present invention for reducing the temperature rise of a staggered pole compound excitation motor includes a cooling water channel 1, a two-section stator, a DC excitation winding 2, etc. The two stator sections are completely disconnected at the middle position to form segmented stator one 3 and segmented stator two 4. A sufficient number of stator yoke cooling water channels are arranged on the outer circumference of the two stator cores. Segmented stator one 3 and segmented stator two 4 both include stator cores and armature windings. Both stators are laminated by silicon steel sheets and made of embedded copper wire windings. The cooling water channel 1 includes the same number of circular water channels as the arc grooves of the stator core, water collection rings at both ends, water inlet and outlet pipes, and water channels that are concave at the stator disconnection position. The cooling water channel 1 is inserted from the outside of the two sections of the stator, and the cooling water channel slots in the stator yoke ensure that the two are completely fixed; the DC excitation winding 2 is wound circumferentially around the disconnected part of the stator, which is the recess of the cooling water channel; the magnetically conductive back yoke 5 of the stator is heated It is placed on the outer circle of the cooling water channel 1 and plays the role of axial magnetization.

Preferably, the segmented stator one 3, the segmented stator two 4, the DC auxiliary excitation winding 2 and the stator magnetic back yoke 5 can be optimized and designed through the motor optimization design method to achieve the best rated operating efficiency and appropriate adjustment. pressure range and minimum volume weight.

Preferably, the cooling water channel 1 selects an appropriate water channel form according to the motor operating temperature and processing technology, such as spiral water channels and circular water channels. Its specific size parameters can be optimized through design to optimize the heat dissipation effect of the motor to ensure that the motor works at within safe temperature range.

The novel cooling structure of the present invention fixes the cooling water channel. The segmented stator 3 and the segmented stator 2 4 have cooling water channel grooves in their yoke parts. The segmented stator 3 and the segmented stator 2 4 are completely disconnected in the middle position, respectively. It is a two-section stator, and the cooling water channel is concave in the disconnected part of the stator. The cooling water channel 1 is inserted into the segmented stator 1 3 and the segmented stator 2 4 from the outside of both axial ends, and is fixed to the cooling water channel through the cooling water channel groove of the stator yoke. The DC excitation winding 2 is wound around the disconnected part of the stator, that is, the recess of the cooling water channel in the circumferential direction. When the compound excitation motor is running, current flows into the DC auxiliary excitation winding to adjust the air gap magnetic field, resulting in losses. Loss also occurs in the stator, and the heat generated will be taken away by the cooling water flowing in the cooling water pipe in direct contact, as shown in the figure 5. As shown in Figure 6.

Claims (7)

1. A cooling structure for reducing temperature rise of compound excitation motor of crisscross magnetic pole, its characterized in that: the direct-current excitation winding is wound in the concave part of the cooling water channel of the disconnection part of the two sections of stators along the circumferential direction; the direct contact between the cooling water channel and the two sections of stators and the direct current excitation winding is realized, and the direct current excitation winding is used for reducing the contact thermal resistance between cooling water and the direct current excitation winding and between the two sections of stators.

2. The cooling structure for reducing temperature rise of a compound excitation motor with interleaved poles according to claim 1 wherein: the two-section stator comprises a stator core and an armature winding, and is made of laminated silicon steel sheets and copper wire embedded windings.

3. The cooling structure for reducing temperature rise of a compound excitation motor with interleaved poles according to claim 1 wherein: the two sections of stators are disconnected at the middle position, and the conjugate part of the two sections of stators is provided with a cooling water channel groove.

4. The cooling structure for reducing temperature rise of a compound excitation motor with interleaved poles according to claim 1 wherein: the cooling water channel is inserted from the outer sides of the two sections of stators and is fixed with the cooling water channel through the cooling water channel grooves of the yokes of the two sections of stators.

5. The cooling structure for reducing temperature rise of a compound excitation motor with interleaved poles according to claim 1 wherein: the cooling water channel outer circle shrink fit stator magnetic conduction back yoke plays an axial magnetic conduction role.

6. The cooling structure for reducing temperature rise of a compound excitation motor with interleaved poles according to claim 1 wherein: the cooling water channel comprises circular water channels, water collecting rings at two ends, water inlet and outlet pipes and water channels with concave breaking positions of the stators at two ends, wherein the number of the circular water channels is the same as that of the circular arc grooves of the two sections of stator cores.

7. The cooling structure for reducing temperature rise of a compound excitation motor with interleaved poles according to claim 1 wherein: the cooling water channel is a spiral water channel or a circular water channel.