CN116722698A - Copper bar rotor motor design with axial flow inner fan - Google Patents

Abstract

The invention provides a copper bar rotor motor main structure with axial fans arranged at two sides, which mainly comprises the axial fans at two sides, a stator pressing ring, a stator ventilation plate, a reinforcing ring, a copper bar rotor and a rotor ventilation plate. The axial flow fan is provided with an inner layer of fan blades and an outer layer of fan blades, the inner layer of fan blades are formed by deflecting fan ribs by a certain angle, the inner and outer fan blades are respectively arranged on the inner side and the outer side of the fan barrel, the two axial flow fans are coaxial with copper bar rotors and are respectively arranged on the two sides of the rotors, radial air paths with equal axial lengths are arranged between the stator and rotor core sections, a certain number of ventilation channel steels are uniformly distributed on the stator ventilation plate and the rotor ventilation plate in the circumferential direction, reinforcing rings are arranged on the end parts of the two sides of the rotors, the flow guiding rings are integrated with the reinforcing rings, the flow direction of fluid is changed, and the radial air paths are arranged between the end parts of the rotors and the iron cores. The motor structure is a high-capacity motor structure, the flow direction of cooling fluid can be optimized while the power density and the current density of the motor are improved, the temperature rise of the motor is effectively reduced, and the temperature rise of the motor is controlled within the insulation requirement.

Description

Copper bar rotor motor design with axial flow inner fan

Technical Field

The invention relates to the technical field of motors, in particular to a copper bar rotor motor structure for installing an axial flow inner fan.

Technical Field

With the increase of the motor capacity, the electromagnetic load is continuously increased, and the heating problem of the motor is increasingly serious. The corresponding increase of the power density of the high-power motor can make the internal ventilation and heat dissipation problem more prominent, and the continuous improvement of the motor efficiency requirement causes the reliability and the safety of the motor operation to have great problems. Copper rotors can be used to produce high-and even ultra-high-efficiency motors without the need to enlarge the size of the motor frame. The rotor and stator of the motor need to be redesigned according to the characteristics of the cast copper rotor, which can maximize the efficiency of the motor, thereby achieving higher or even higher energy efficiency. While the motor is moving to a higher level of efficiency, replacing the typical bi-directional centrifugal fan of an external cooling system with a uni-directional axial flow fan may reduce acoustic noise and increase the overall efficiency of the motor. Therefore, copper bar rotors are used in the high-capacity motor, and the cooling by using an axial flow fan accords with the future development trend of the motor.

Disclosure of Invention

The invention aims to design a copper bar rotor motor with axial flow fans arranged on two sides, so that the capacity and efficiency of the motor are improved, the integral temperature rise of the motor is reduced, and the reliability and safety of the motor and a power grid are ensured.

Therefore, the invention provides the inner and outer double-layer axial flow fan, the stator ventilation plate, the guide ring, the copper bar rotor and the rotor ventilation plate, so that the copper loss of the copper bar rotor is reduced, the temperature rise of the motor is reduced, the flow direction of cooling fluid is optimized, the utilization rate of the cooling fluid is improved, and the cooling effect of the axial flow fan on the motor is enhanced.

According to the copper bar rotor structure of the high-power motor, the copper bar rotor structure comprises an axial flow fan, a stator pressing ring, a stator ventilation plate, a guide ring, a reinforcing ring, a rotor pressing ring, a rotor iron core, a rotor conductor, a rotor ventilation plate and the like.

The inner-outer double-layer axial flow fan is provided with two layers of fan blades, the outer layers of fan blades are fixed on the fan barrel, the inner layers of fan blades are formed by deflecting fan ribs by a certain angle, and the fan barrel is arranged between the inner layer and the outer layer.

The inner diameter and the outer diameter of the stator pressing ring are the same as those of the stator core, and the stator pressing ring plays a role in fixing the stator in the rotating process of the motor.

The stator core is formed by a plurality of stator core segments, between which a stator radial air duct is formed.

The stator ventilation board circumference evenly distributed certain quantity's cuboid ventilation channel-section steel, the radial somewhere both sides of channel-section steel have trapezoidal wing, and cuboid ventilation channel-section steel and the trapezoidal wing of both sides are integrated into one piece structure.

The guide ring and the reinforcing ring are of an integrated structure, the guide ring is fixed on the radial part of the reinforcing ring, a certain angle is formed between the whole guide ring and the axial direction, and the guide ring enables cooling air formed by rotation of the outer layer fan blades to flow into the air gap along the guide ring at a certain angle.

The reinforcing ring is divided into a radial part and an axial part, a certain number of ventilation holes are uniformly distributed on the radial part in the circumferential direction so that cooling fluid flows to the rotor core, the circumferential part is arranged on the outer side of the end part of the rotor, and the reinforcing ring plays a role in fixing the position of the end part of the rotor, so that the end part of the rotor is not influenced by centrifugal force in the rotating process.

The rotor pressing ring plays a role in fixing the rotor core in the rotating process of the motor.

The rotor core is formed by a plurality of rotor core segments, between which a rotor radial air duct is formed. The rotor core section and the rotor pressing ring are circumferentially and uniformly distributed with a certain number of ventilation holes with the same number.

The rotor ventilation board circumference evenly distributed a certain amount of ventilation channel-section steel, and the both sides symmetry of certain position of channel-section steel has trapezoidal wing, channel-section steel and trapezoidal wing structure as an organic whole, and rotor circumference is last to have the ventilation hole of distribution and rotor punching on same shape and quantity.

The invention has the beneficial effects that:

1) The double-layer fan blades layer the cooling fluid, so that the utilization rate of the cooling fluid is improved, and the outflow speed of the cooling fluid from the end part of the stator winding is reduced.

2) Copper bar rotor, when improving motor capacity and efficiency, effectively reduce the motor temperature rise.

3) The channel steel with the trapezoid fins on the two sides of the stator end plate enables a radial ventilating duct with wide ends and narrow middle to be formed between the two channel steel, cold wind entering the radial ventilating duct of the stator is accelerated at the middle narrow part, then flows out of the stator in an acceleration way, flows to an inner wind path outlet, enhances the cooling effect on the stator core, and reduces the temperature rise of the stator core.

4) The guide ring makes the fluid flowing axially outside the fan cylinder to the stator core form a certain angle with the shaft, which is more beneficial to the fluid flowing into the air gap, increases the cooling fluid flowing into the air gap and reduces the temperature of the stator core segment.

5) The channel steel on the rotor ventilating plate enables a rotor radial ventilating duct with one narrow end and one wide end between the two channel steel, so that cooling fluid entering the rotor radial ventilating duct is accelerated between the channel steel, then accelerated to flow to an air gap, the cooling effect on the rotor core is enhanced, and the temperature rise of the rotor core is reduced.

Drawings

Fig. 1 is a schematic diagram of an inner-outer double-layer fan blade axial flow fan according to the present invention, wherein 1 is a fan rib, 2 is a fan blade, and 3 is a fan barrel.

Fig. 2 is a schematic diagram of a stator structure according to the present invention, wherein 4 is a winding, 5 is a stator pressing ring, 6 is a stator core, 7 is a stator ventilation board, 8 is stator insulation, and 9 is a slot wedge.

Fig. 3 is a schematic diagram of a portion of a stator ventilation board according to the present invention, wherein 7 is a stator ventilation board, and the distribution of channel steel on the stator ventilation board and trapezoidal fins on two sides of the channel steel can be seen in the figure.

Fig. 4 is a schematic diagram of a portion of a stator lamination according to the present invention, wherein 10 is a stator lamination.

Fig. 5 is a schematic diagram of a portion of a guide ring and a reinforcing ring according to the present invention, wherein 11 is the guide ring and 12 is the reinforcing ring.

Fig. 6 is a schematic view of a rotor structure according to the present invention, wherein 13 is a rotor end portion, 14 is a rotor pressing ring, 15 is a rotor copper conductor, 16 is a rotor ventilation plate, and 17 is a rotor core.

Fig. 7 is a schematic view of a rotor ventilation board according to the present invention, wherein 16 is the rotor end, and the channel distribution and the rotor axial ventilation channel distribution on the stator ventilation board can be seen.

Fig. 8 is a schematic view of a rotor sheet according to the present invention, wherein 18 is the rotor sheet.

Fig. 9 is a schematic view of a part of a copper rotor high-capacity motor assembly with an axial fan according to the present invention, wherein 19 is a motor main shaft.

Description of the embodiments

The invention is further described below with reference to the accompanying drawings.

As shown in figure 1, the main structure of the inner-outer double-layer fan blade axial-flow inner fan disclosed by the invention comprises a fan rib 1, fan blades 2 and a fan barrel 3, wherein cooling fluid at the inner side and the outer side flows to different heating parts through isolation of the fan barrel 3, the air inlet quantity and the air inlet speed of the axial-flow fan are increased after the fan rib deflects a certain angle, and meanwhile, the cooling fluid flowing to an axial ventilating duct of a rotor is increased.

As shown in fig. 2, the stator of the invention has the structures of windings, stator pressing rings, stator iron cores, stator ventilating plates, stator insulation, slot wedges and the like, the stator pressing rings are respectively arranged on two sides of the stator iron cores, the stator iron cores are divided into a plurality of sections, radial ventilating channels are arranged between the iron core sections, the stator ventilating plates are arranged in the ventilating channels, the stator insulation surrounds the stator windings, and the slot wedges are embedded in the stator slots to prevent the windings and the insulation from vibrating in the running process of the motor.

As shown in fig. 3, a certain number of ventilation channel steel with trapezoidal fins are uniformly distributed on the stator ventilation board in the circumferential direction, the ventilation channel steel body is of a cuboid structure, quadrangular columns of the trapezoidal structure are symmetrically arranged on two sides of a certain part of the ventilation channel steel, the quadrangular columns of the trapezoidal structure are called as trapezoidal fins of the ventilation channel steel, the uniform distribution of the ventilation channel steel enables a stator radial ventilation channel between two channel steel to be of a structure with wide sides and narrow middle, cooling air flows from a position with wide ventilation channel on the inner side of an end plate to a position with narrow ventilation channel, pressure intensity is increased, wind speed is increased, and then the cooling air flows out of the stator structure from a position with wide side of the end plate.

As shown in fig. 4, the stator punching sheet of the present invention is an open slot.

As shown in fig. 5, the guide ring structure and the axial direction of the guide ring form a certain angle, the guide ring is fixed on the radial part of the reinforcing ring and forms a certain angle with the axial direction, and a certain number of ventilation holes are uniformly distributed on the circumferential direction of the reinforcing ring.

As shown in fig. 6, the rotor assembly structure of the invention mainly comprises a rotor ventilation plate 8, a rotor end 14, a rotor iron core 15, a rotor copper conductor 16 and a shaft 17, wherein a reinforcing ring is arranged on the rotor end to fix the rotor end, the rotor iron core consists of iron core sections with the same number as that of the stator iron cores for enhancing the cooling effect of the rotor iron core, radial ventilation channels are arranged between the iron core sections, the rotor ventilation plates are arranged in the radial ventilation channels, rotor pressing rings are arranged on two sides of the rotor iron core, and the rotor pressing rings, the rotor iron core and the rotor ventilation plates are uniformly distributed with the rotor axial ventilation channels in the circumferential direction.

As shown in fig. 7, a certain number of ventilation channel steel and rotor axial ventilation channels are uniformly distributed on the rotor sub-ventilation board in the circumferential direction, and the ventilation channel steel main body is of a cuboid structure.

As shown in FIG. 8, the rotor punching sheet is of a closed slot structure, and a certain number of square rotor axial ventilating channels are uniformly distributed in the circumferential direction.

As shown in figure 9, the main structural position distribution of the copper bar rotor high-capacity motor with the axial flow fan is shown in the figure, the axial flow fan, the reinforcing ring and the rotor are arranged on the shaft, a certain distance is reserved between the fan barrel and the reinforcing ring for fluid to pass through, the reinforcing ring is arranged on the outer ring at the end part of the rotor, the guide ring is fixed on the reinforcing ring, and the positions of the rotor ventilating plate of the stator ventilating plate, the rotor core section of the stator core section and the rotor ventilating plate of the stator ventilating plate and the axial length are in one-to-one correspondence.

In describing the present invention, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description and simplification of description, and does not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present invention.

The above description and description of the structure of the motor air path of the present invention are only for illustrating the technical scheme of the present invention, but not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A copper bar rotor motor structure with an axial flow internal fan, which is characterized by: The dual axial flow fan is installed on both sides of the rotor. The outer fan blades and fan ribs of the axial flow fan are installed on the outside of the fan barrel of the axial flow fan. The fan ribs are deflected at a certain angle about the axial symmetry plane to form a one-way fan; The stator punching groove type is an open groove. The stator core is formed by multiple core segments axially spaced at a certain distance. There are stator pressure rings at both ends of the stator core. There are radial ventilation channels between the core segments for radial ventilation. A stator ventilation plate is installed in the channel. A certain number of channel steels are evenly distributed in the circumferential direction of the stator ventilation plate. There are trapezoidal fins on both sides of a certain position of the channel steel; The guide ring is fixed on the reinforcement ring. The guide ring and the reinforcement ring are an integrated structure. The guide ring makes it easier for the cooling fluid flowing through the outer blade of the axial flow fan to enter the depth of the air gap. The reinforcement ring is installed at the end of the rotor. On the top, a certain number of ventilation holes are evenly distributed around the reinforcing ring; The rotor punching groove is a closed groove. The rotor core is formed by multiple core segments axially spaced at a certain distance. There are rotor pressure rings at both ends of the rotor core. There is a radial air path between the rotor end and the rotor pressure ring. , there are radial ventilation ducts between the rotor core segments, and the rotor ventilation plates are installed in the radial ventilation ducts. A certain number of channel steels are evenly distributed in the circumferential direction of the rotor ventilation plates. The rotor pressure ring, rotor core, and rotor ventilation plates are evenly distributed in the circumferential direction. There are a certain number of ventilation channels, and the rotor conductor material is pure copper. 2. The copper bar rotor motor according to claim 1, characterized in that: axial flow fans are installed on both sides of the rotor core, and the outer fan blades of the axial flow fan are axial flow fan blades fixed on the outside of the fan barrel, and the inner and outer two-layer fans are There is a fan cylinder between the blades, and the inner fan blade is formed by a fan rib deflected at a certain angle about the axial symmetry plane. 3. The copper bar rotor motor according to claim 1, characterized in that: the guide ring is fixed on the reinforcing ring, the reinforcing ring is installed on the outer ring at the end of the rotor, and the ventilation holes are evenly distributed in the circumferential direction of the reinforcing ring. 4. The copper bar rotor motor according to claim 1, characterized in that: a certain number of ventilation channel steel with trapezoidal fins are evenly distributed in the circumferential direction of the stator end plate, that is, a certain part of the cuboid ventilation channel steel has symmetrical trapezoidal fins on both sides. . 5. The copper bar rotor motor according to claim 1, characterized in that there is a radial air path between the rotor end and the rotor pressing ring. 6. The copper bar rotor motor according to claim 1, characterized in that: there are radial air paths between the stator core segments, and there are radial air paths between the rotor core segments. The rotor pressure ring, the rotor ventilation plate, Axial ventilation channels are evenly distributed around the rotor core section. 7. The copper bar rotor motor according to claim 1, characterized in that: the rotor conductor material is pure copper.