WO2016206342A1

WO2016206342A1 - Self-circulation liquid-cooled permanent magnet motor

Info

Publication number: WO2016206342A1
Application number: PCT/CN2015/099728
Authority: WO
Inventors: 戴杰
Original assignee: 戴杰
Priority date: 2015-06-23
Filing date: 2015-12-30
Publication date: 2016-12-29
Also published as: CN105680628A; CN105680628B

Abstract

Disclosed is a self-circulation liquid-cooled permanent magnet motor, comprising a stator (2) and a rotor (1). The stator (2) is sleeved onto an outside of the rotor (1). The rotor (1) comprises a metal rotor and a metal main shaft (11), and the metal rotor is sleeved onto and connected to an outside of the metal main shaft (11). The stator (2) is provided with a liquid pumping chamber (4). A liquid inlet port (231) is provided in the middle part of the liquid pumping chamber (4), a liquid outlet port (232) is provided at an edge position of the liquid pumping chamber (4), and a pump impeller (15) made of a heat sink material and connected to the rotor main shaft (11) is provided in the liquid pumping chamber (4). The pump impeller made of the heat sink material is immersed in a low-temperature environment of the liquid pumping chamber; therefore, as long as the motor is rotating and working, a cooling liquid is continuously circulating under the action of the pump impeller to dissipate the heat of the rotor, thus preventing failure of the permanent magnet due to demagnetization.

Description

High power ratio self-circulating liquid cooling permanent magnet motor

Technical field

The utility model relates to a motor, in particular to a high-power ratio self-circulating liquid-cooled permanent magnet motor with heat dissipation function.

Background technique

With the continuous advancement and development of the society, in order to put forward the requirements of high efficiency and energy saving and emission reduction for various vehicles, there are certain requirements for the performance of the motor, and it is required that the high efficiency motor must reach a certain power density ratio to meet the same performance. When the size of the motor is reduced, the consumption of raw materials is reduced, especially in the case of requiring the motor to be sealed and waterproof, safe and reliable operation, and the design of the motor is excellent.

Although there are many technical patents in the permanent magnet brushless motor, there are still technical bottlenecks of the motor. At present, there are a large number of technical patents for water-cooled motors, and only the stator cooling of the motor is cooled, which cannot solve the problem of cooling and cooling of the sealed motor rotor. The rotor will generate high temperature during the working process. The permanent magnet of the current high-power motor rotor is made of high-temperature samarium-cobalt material. The samarium-cobalt material has high temperature resistance, but its magnetic field strength characteristic is only half of the performance of the aluminum-iron-boron material. The motor made of samarium cobalt has a large volume and a relatively low power density.

Summary of the invention

The purpose of the utility model is to provide a high-power ratio self-circulating liquid-cooled permanent magnet motor capable of dissipating heat to the rotor, thereby improving the heat dissipation efficiency of the rotor and providing a powerful magnetic strip for the aluminum-iron-boron material. The heat dissipation conditions are used to obtain a high power, low cost motor.

In order to achieve the above object, the technical scheme adopted by the utility model for high-power ratio self-circulating liquid-cooled permanent magnet motor is:

A high power ratio self-circulating liquid-cooled permanent magnet motor comprising a stator and a rotor, the stator being sleeved on an outer side of the rotor, the rotor comprising a metal rotor and a metal main shaft, the metal rotor being sleeved on an outer side of the metal main shaft, the stator A liquid pump chamber is arranged, a liquid inlet is provided in a middle portion of the liquid pump chamber, a liquid outlet is arranged at an edge of the liquid pump chamber, and a pump impeller made of a heat dissipating material connected to the rotor main shaft is disposed in the liquid pump chamber. The pump impeller made of heat-dissipating material is immersed in the liquid pump chamber, and the coolant outside the motor is sucked in and then discharged for heat exchange. The pump impeller is in a low temperature environment, and the heat of the metal main shaft and the metal rotor is directed to the low-temperature pump impeller. The heat is transferred to the pump impeller and sent to the coolant, and the coolant continuously circulates under the action of the pump impeller to discharge the heat of the rotor.

The stator is provided with a cooling passage communicating with the liquid pump chamber, and the centrifugal force generated by the pump impeller pushes the cooling liquid toward the cooling passage. One end of the cooling passage communicates with the edge of the liquid pump chamber, and the other end communicates with the liquid outlet. The centrifugal force generated by the rotation of the pump impeller sucks the coolant of the inlet port into the cooling passage, and the coolant in the cooling passage flows to the outlet port, and the coolant can take away the heat of the stator while absorbing the heat of the rotor. Now has a good heat dissipation effect.

The end surface of the pump impeller is provided with a centrifugal groove directed from the center of the circle, and a center of the pump impeller is provided with a small circular groove communicating with the centrifugal groove. The pump impeller is equipped with a centrifugal groove to form a flow passage of the coolant. The small circular groove faces the inlet. Under the action of centrifugal force, the coolant flows from the inlet into the small circular groove. The coolant in the tank enters the cooling passage through the centrifugal groove and then flows out from the liquid outlet.

The outer peripheral surface of the pump impeller is uniformly provided with convex teeth. The convex teeth on the outer peripheral surface of the pump impeller better centrifugally pump out the coolant, giving the coolant a greater pressure, increasing the flow rate of the coolant and increasing the heat dissipation rate.

The liquid pump chamber is disposed at the tail of the motor, and includes a middle end cover and a rear end cover. The middle end cover and the rear end are sealedly connected. The middle portion is provided with a large circular groove, and the large circular groove is opened and cooled. A centrifugal passage communicating at one end, and both ends of the cooling passage communicate with the liquid outlet. The centrifugal passage communicates with the cooling passage to smoothly guide the coolant to the cooling passage to dissipate heat from the stator of the motor.

The cooling passage includes a plurality of axial passages disposed inside the stator housing, and a side of the front end cover of the motor connected to the housing is provided with a plurality of first blind holes, and each of the first blind holes is connected by two adjacent The axial passage, the side of the rear end cover of the motor is connected with the housing, and a plurality of second blind holes are arranged. The second blind hole and the first blind hole are arranged in a staggered manner and the axial through hole is connected to form a complete The cooling passage, the cooling passage is directed from the rear end cover of the motor to the front end, and then the front end cover is directed to the rear end cover. After repeated folding back, the inlet of the cooling passage communicates with the edge of the liquid pump chamber, and the outlet communicates with the liquid outlet. The cooling passage of the motor is a continuously bent return passage, which leads from the rear end cover of the motor to the front end cover and then from the front end cover to the rear end cover, which is filled with the housing of the motor for one week, increasing the heat absorption area of the cooling passage. , improved heat dissipation.

The cooling passage includes a plurality of axial passages disposed inside the stator housing, and a side of the front end cover of the motor connected to the housing is provided with a plurality of first blind holes, and each of the first blind holes is connected by two adjacent The intermediate end cover is provided with a transition through hole which is matched with the axial through hole of the housing, and the side where the intermediate end cover is connected with the rear end cover is provided with a plurality of communication grooves which are offset from the first blind hole. The communication groove connects the transition through holes to form a complete cooling passage. The cooling passage is directed from the rear end cover of the motor to the front end, and then the front end cover is directed to the rear end cover. After multiple foldbacks, the inlet of the cooling passage is The edge of the liquid pump chamber is in communication, and the outlet is connected to the liquid outlet. The mechanism is simple, compact and reasonable, and the cooling passage and the liquid pump chamber are fully arranged, the heat absorption area is increased, and the stator and the rotor are simultaneously dissipated, thereby improving the heat dissipation effect, and is particularly suitable for waterproof motors.

The axial through holes are evenly distributed on the inner side of the housing centered on the axis of the stator. Uniformly placed on the inside of the housing improves the uniformity of heat dissipation from the stator.

The metal rotor comprises a metal bracket and a magnetic pole sleeve of a metal sleeved outside the metal bracket, magnetic The magnetic pole bundle is connected to the pole sleeve, and the magnetic pole bundles of different polarities are arranged at intervals.

Each magnetic pole bundle includes three magnetic strips of the same magnetic pole, wherein two magnetic strips are arranged side by side close to the axis, and a third magnetic strip is disposed outside the intermediate position of the two magnetic strips, and three magnetic strips of each magnetic pole bundle are mutually parallel. The three magnetic poles of the magnetic pole beam are superimposed on each other to increase the magnetic pole strength and improve the power of the motor. The pump impeller can well absorb the heat generated by the magnetic pole beam and release it into the cooling liquid, which provides a favorable basis for the use of the aluminum-iron-boron magnetic strip. At the same time, the size and cost of the motor are reduced.

Compared with the prior art, the utility model has the following advantages:

The heat generated by the rotor is transmitted to the pump impeller through the metal rotor and the metal main shaft. The pump impeller is made of a heat dissipating material, which can absorb and transfer heat well and transfer the heat to the cooling liquid. The heat is released into the cooling liquid, which provides a good heat dissipation foundation for the aluminum-iron-boron magnetic strip with stronger magnetic properties, low heat dissipation effect and low price, improves the working efficiency and power density of the motor, and prevents high-temperature demagnetization. It protects the magnetic properties of the magnetic strip, reduces the cost and volume of the motor, has high reliability and overload resistance, and improves the service life of the motor, especially suitable for sealing and waterproofing permanent magnet motors.

DRAWINGS

Figure 1 is a schematic diagram of a high power ratio self-circulating liquid cooled permanent magnet motor.

Fig. 2 is a cross-sectional view taken along line V-V of Fig. 1;

Figure 3 is a schematic view of the front end cover.

Figure 4 is a schematic illustration of the intermediate end cap.

Figure 5 is a schematic illustration of another angle of the intermediate end cap.

Figure 6 is a schematic view of the rear end cover.

Fig. 7 is a schematic structural view of a pump impeller.

Figure 8 is a cross-sectional view of the rotor.

Figure 9 is an exploded view of a high power ratio self-circulating liquid cooled permanent magnet motor.

detailed description

The present invention will be further clarified with reference to the accompanying drawings and specific embodiments. It is understood that the embodiments are only used to illustrate the invention and not to limit the scope of the present invention. After reading the present invention, those skilled in the art will Modifications of the various equivalents of the invention are intended to be within the scope of the appended claims.

As shown in FIG. 1, FIG. 8 and FIG. 9, a high-power ratio self-circulating liquid-cooled permanent magnet motor includes a rotor 1 and a stator 2. The rotor 1 includes a main shaft 11, a metal bracket 12 sleeved on the outer side of the main shaft, and a socket. A magnetic pole sleeve 13 outside the metal bracket and a magnetic pole bundle 14 that is engaged with the magnetic pole sleeve 13 are connected to the pump impeller 15 by bolts at the tail end. The stator includes a cylindrical housing 21, a front end cover 22 that is mounted at the front end of the housing by screws, and a rear end cover 23 that is mounted at the rear end of the housing by screws, between the rear end cover 23 and the housing 21. A middle end cap 24 is provided. The front end of the main shaft is axially connected to the front end cover 22 via a bearing and a seal ring assembly 3, and the tail end of the main shaft is axially coupled to the intermediate end cover through a bearing and a seal ring assembly 3. The periphery of the middle end cover and the rear end cover are press-fitted to the housing by screws, and a large circular groove 241 is defined in the middle of the middle end cover, and the liquid pump chamber is formed between the large circular groove and the rear end cover. 4. The pump impeller 15 is located in the liquid pump chamber. The middle portion of the rear end cover is provided with a liquid inlet 231 communicating with the liquid pump chamber, and the edge of the rear end cover is connected with a liquid outlet 232. The pump impeller and the metal bracket can be made of aluminum, copper, aluminum alloy or copper alloy material to facilitate heat transfer. The pump impeller rotates the coolant outside the motor and then discharges it for heat exchange. The pump impeller is in a low temperature environment. The heat of the metal main shaft and the metal rotor is transferred to the low temperature pump impeller, so that the heat generated by the rotor is sent to the pump impeller and sent to the cooling liquid, and the cooling liquid is continuously circulated by the pump impeller to discharge the heat of the rotor.

As shown in FIG. 2 to FIG. 6 and FIG. 9, the housing 21 of the high-power ratio self-circulating liquid-cooled permanent magnet motor has eight axial through holes 211 centered on the axis of the housing, and the front end cover 22 faces One side of the housing is arranged with four first blind holes 221, which connect the eight axial through holes 211 to form a U-shaped pipe, and the intermediate end cover 24 faces the casing. The side is provided with eight transition through holes 242, and the middle end cover 24 is provided with four communication grooves 243 on one side of the rear end cover, and the four communication grooves 243 are arranged offset from the first blind holes 221 to set the other two The two axial through holes communicate to form an S-shaped cooling passage, and the middle end cover is open to the central portion of the rear end cover and has a large circular groove 241 in the middle, wherein one of the communication grooves 243 passes through the centrifugal passage 244 and is large. The circular groove 241 is connected, the periphery of the rear cover is pressed by the screw, and the liquid pump chamber is connected with the cooling passage. The cooling passage is directed by the rear end cover of the motor to the front end, and then the front end cover is pointed to the rear end cover. After a plurality of foldbacks, the communication groove 243 communicating with the centrifugal passage 244 is an inlet of the cooling passage, and the communication groove and the liquid pump The chamber communicates with any other communication groove 243 as an outlet communicating with the liquid outlet.

In another embodiment, the large circular groove of the liquid pump chamber and the centrifugal passage are disposed on a side of the rear end cover opposite the intermediate end cover, and four second blind holes are opened in the rear end cover, and the second The blind hole and the first blind hole are staggered to connect the other two axial through holes, wherein one of the second blind holes is connected with the centrifugal passage as the inlet of the cooling passage, and any other second blind hole is used as the outlet and outlet of the cooling passage. The liquid port is connected.

As shown in FIG. 7 and FIG. 9, the pump impeller 15 is evenly distributed with a plurality of centrifugal grooves 151 on the end surface of the rear end cover. The centrifugal groove 151 is directed from the axis of the pump impeller to the circumferential surface, and the center of the pump impeller is opened. a small circular groove 152 communicating with the centrifugal groove 151, the liquid inlet 231 is directly opposite the small circular groove 152, and a plurality of convex teeth 153 are arranged on the circumferential surface of the pump impeller, and the convex teeth 153 are inclined tooth. The pump impeller 15 rotates under the driving of the main shaft 11. The rotating pump impeller generates centrifugal force, and the coolant is continuously sucked from the inlet port and pushed to the inlet of the cooling passage through the centrifugal groove. The centrifugal force of the pump impeller will cool the coolant in the cooling passage. Pressure is formed to push the coolant in the cooling passage toward the liquid outlet 232.

As shown in FIG. 8, the rotor includes a main shaft 11, a metal bracket 12 sleeved on the outer side of the main shaft, a magnetic pole sleeve 13 sleeved on the outer side of the metal bracket, and a magnetic pole bundle 14 embedded on the magnetic pole sleeve 13, magnetic poles of different polarities. The bundles 14 are spaced apart, and each of the magnetic pole bundles includes three magnetic strips 141 having the same magnetic poles, wherein the two magnetic strips are arranged side by side close to the axis, and a third magnetic strip is disposed outside the intermediate positions of the two magnetic strips, each magnetic pole bundle The three magnetic strips are parallel to each other, and the three magnetic poles of the magnetic pole bundle are superimposed on each other to increase the magnetic pole strength and improve the power of the motor. The pump impeller can well absorb the heat generated by the magnetic pole beam and release it into the cooling liquid. Boron magnetic strips provide an advantageous basis while reducing the size and cost of the motor.

The high-power ratio self-circulating liquid-cooled permanent magnet motor of the utility model is a permanent magnet motor, and the magnetic strip adopts a magnetic aluminum-iron-boron magnetic strip, and the three magnetic strips superimpose the magnetic force of the accumulated magnetic pole beam to improve the power of the motor. The aluminum-iron-boron magnetic strip is sealed in the motor and it is easy to generate heat. This heat will cause the magnetic strip to demagnetize, and the heat must be released in time. The heat generated by the magnetic strip is transmitted to the magnetic pole sleeve of the metal, the metal bracket and the main shaft. The main shaft transfers heat to the pump impeller. The pump impeller is surrounded by the coolant in the pump chamber. The rotation of the pump impeller can continuously move the outside of the motor. The coolant is absorbed into the liquid pump chamber through the inlet port, and the coolant that absorbs the heat is discharged through the outlet port. Therefore, the pump impeller is always in a low temperature environment, and the heat transfer is transmitted from the high temperature object to the low temperature. The object, so the heat of the magnetic strip is continuously transmitted to the coolant through the pump impeller to avoid the magnetic strip being demagnetized by high temperature. At the same time, the pump impeller will push the coolant into the cooling passage of the stator to cool the stator, which better reduces the temperature of the motor to slow down the aging of the motor and prolong the service life of the motor.

The high-power ratio self-circulating liquid-cooled permanent magnet motor of the utility model selects an aluminum-iron-boron material with strong magnetic field strength and high temperature resistance, and designs a heat dissipation cooling path for the sealed motor rotor, and solves the power of the current high-power sealed motor. Density problem, self-contained circulating cooling device solves the problem of heat dissipation of the rotor. At the same time, the combination of multiple magnets is selected to reduce the temperature rise of the magnet itself, so that the rotor does not enter the high temperature region when working, ensuring that the rotor body of the motor does not demagnetize and improve the motor power. Density improves motor reliability and overload resistance, reduces motor weight and volume, and reduces cost and raw material consumption.

Claims

A high power ratio self-circulating liquid-cooled permanent magnet motor comprising a stator and a rotor, the stator being sleeved on the outer side of the rotor, wherein the rotor comprises a metal rotor and a metal main shaft, and the metal rotor is sleeved on the outer side of the metal main shaft The stator is provided with a liquid pump chamber, a liquid inlet is arranged in a middle portion of the liquid pump chamber, a liquid outlet is arranged at an edge of the liquid pump chamber, and a heat dissipation material connected to the rotor main shaft is arranged in the liquid pump chamber. Pump impeller.
The high power ratio self-circulating liquid-cooled permanent magnet motor according to claim 1, wherein the stator is provided with a cooling passage communicating with the liquid pump chamber, and the centrifugal force generated by the pump impeller pushes the cooling liquid toward the cooling passage, the cooling passage One end is in communication with the edge of the liquid pump chamber, and the other end is in communication with the liquid outlet.
The high power ratio self-circulating liquid-cooled permanent magnet motor according to claim 1, wherein the end surface of the pump impeller is provided with a centrifugal groove directed from the center of the circle, and the center of the pump impeller is open to communicate with the centrifugal groove. Small circular groove.
The high power ratio self-circulating liquid-cooled permanent magnet motor according to claim 3, wherein the outer peripheral surface of the pump impeller is provided with convex teeth.
A high power ratio self-circulating liquid-cooled permanent magnet motor according to claim 2, wherein said liquid pump chamber is disposed at a tail portion of the motor, including a middle end cover and a rear end cover, a periphery of the intermediate end cover and the rear end The sealing connection is provided with a large circular groove in the middle, and the large circular groove is provided with a centrifugal passage communicating with one end of the cooling passage, and both ends of the cooling passage communicate with the liquid outlet.
The high power ratio self-circulating liquid-cooled permanent magnet motor according to claim 2, wherein the cooling passage comprises a plurality of axial passages disposed inside the stator housing, and the front end cover of the motor is connected to the housing. a plurality of first blind holes are disposed on one side, and each of the first blind holes communicates with two adjacent axial passages, and a second blind hole is disposed on a side of the rear end cover of the motor connected to the housing, The two blind holes are arranged in a staggered arrangement with the first blind holes and the axial through holes are formed to form a complete cooling passage. The cooling passage is directed from the rear end cover of the motor to the front end, and then the front end cover is directed to the rear end cover. In the foldback, the inlet of the cooling passage communicates with the edge of the liquid pumping chamber, and the outlet communicates with the liquid outlet.
The high power ratio self-circulating liquid-cooled permanent magnet motor according to claim 5, wherein the cooling passage comprises a plurality of axial passages disposed inside the stator housing, and the front end cover of the motor is connected to the housing. One side is provided with a plurality of first blind holes, each of the first blind holes is connected to two adjacent axial passages, and the intermediate end cover is provided with a transition through hole which is matched with the axial through hole of the housing, and the middle end cover The side connected to the rear end cover is provided with a plurality of communication grooves which are offset from the first blind holes, and the communication grooves communicate the two through the transition through holes to form a complete cooling passage, and the cooling passage is pointed by the rear end cover of the motor. At the front end, the front end cover is directed to the rear end cover, and after multiple foldbacks, the inlet of the cooling passage communicates with the edge of the liquid pump chamber, and the outlet communicates with the liquid outlet.
The high power ratio self-circulating liquid-cooled permanent magnet motor according to claim 6 or 7, wherein the axial through hole is evenly distributed inside the casing centered on the axis of the stator.
The high power ratio self-circulating liquid-cooled permanent magnet motor according to claim 1, wherein said metal rotor package The metal bracket and the magnetic pole sleeve of the metal sleeved on the outer side of the metal bracket are clamped with a magnetic pole bundle, and the magnetic pole bundles of different polarities are spaced apart.
The high power ratio self-circulating liquid-cooled permanent magnet motor according to claim 1, wherein each of the magnetic pole bundles comprises three magnetic strips of the same magnetic pole, wherein the two magnetic strips are arranged side by side near the axis, and the two magnetic strips are arranged. A third magnetic strip is disposed outside the intermediate position, and the three magnetic strips of each magnetic pole bundle are parallel to each other.