High-speed motor cooling structure

Abstract

A high-speed motor cooling structure comprises a rotor shaft (1), a winding stator iron core (2), permanent magnets (3), magnetic isolation pressing rings (8), inclined through grooves (5) and a motor base (10), the inclined through grooves (5) are axially formed in the surface of the rotor shaft (1), separation ribs (9) are arranged in the middle of the rotor shaft (1), the permanent magnets (3) are arranged outside the rotor shaft (1) and connected with the magnetic isolation pressing rings (8), the permanent magnets (3) and the magnetic isolation pressing rings (8) are alternately arranged, and the motor base (10) is arranged on the motor base (10). Carbon fiber sheaths (7) are arranged outside the permanent magnets (3) and the magnetic isolation pressing rings (8), clamping rings (6) are arranged on the two sides of the rotor shaft (1), and temperature distribution in the circumferential direction is relatively average. A high-temperature area exists below traditional radial ventilation, but the relative temperature in the circumferential direction of the structure is much balanced.

Description

Technical Field

[0001] The utility model relates to the field of high-speed motors, in particular to a high-speed motor cooling structure. Background Art

[0002] Due to their high speeds, high-speed motors have a relatively small rotor diameter, and their overall size is much smaller than that of low-speed motors of the same power. This results in a high power density per unit volume. Even with their inherently high efficiency, heat dissipation remains a challenge. A common problem with current high-power, high-speed motors is high temperatures, especially localized overheating. Therefore, a good cooling structure is crucial to the design and manufacture of high-power, high-speed motors. Utility Model Content

[0003] In response to the above-mentioned deficiencies in the prior art, the present invention provides a high-speed motor cooling structure with relatively uniform temperature distribution in the circumferential direction, which can effectively reduce harmonics and torque fluctuations generated by motor operation and reduce motor heating.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A high-speed motor cooling structure comprises: a rotor shaft, a winding stator core, permanent magnets, a magnetic isolation pressure ring, an oblique slot, and a motor base. The rotor shaft surface is axially provided with an oblique slot, a separating rib is provided in the middle of the rotor shaft, a permanent magnet is provided on the outside of the rotor shaft, the permanent magnet is connected to the magnetic isolation pressure ring, the permanent magnet and the magnetic isolation pressure ring are alternately arranged, the permanent magnet and the magnetic isolation pressure ring are both provided with a carbon fiber sheath on the outside, and retaining rings are provided on both sides of the rotor shaft. The retaining rings fasten the permanent magnet and the magnetic isolation pressure ring to the rotor shaft surface. The permanent magnet comprises a side permanent magnet and a side permanent magnet, and the side permanent magnet is wider than the side permanent magnet.

[0006] Arc-shaped support ribs are provided on the inner side of the motor base, the inner side of the support ribs is connected to the winding stator core, a ventilation gap is provided between the support ribs and the winding stator core, stator coils are provided on both sides of the winding stator core, an annular central ventilation groove is provided in the middle of the winding stator core, side stator punchings are provided on both sides of the annular central ventilation groove, side stator punchings are provided on both sides of the side stator punchings, the thickness of the side stator punchings is less than that of the side stator punchings, the middle parts of the side stator punchings and the side stator punchings are connected to fixing bars, the side stator punchings and the side stator punchings are fixed by fixing bars, and the inner sides of the side stator punchings and the side stator punchings are connected to the stator coils by teeth.

[0007] Beneficial effects: 1. The shaft of the present invention is provided with an inclined oblique slot. After the support bar is embedded, it forms an inclined position relative to the rotor shaft, and the rotor shaft naturally forms an oblique pole. This can effectively reduce the harmonics and torque fluctuations generated by the operation of the motor, and also reduce the heat generation of the motor to a certain extent. For the rotor shaft, its bottom is not completely closed, leaving a certain amount of space. When the rotor shaft rotates, it can form an effect similar to an axial flow fan, so that the internal medium (air or other) flows in a designed direction, which increases the medium flow near the rotor shaft to a certain extent and enhances the heat dissipation effect of the rotor shaft. Here, the oblique slot is a V-shaped oblique pole. According to the direction of rotation, the airflow flows from both sides to the middle.

[0008] 2. The traditional radial ventilation structure has air intakes on both sides at the top and air outlets in the middle of the top, resulting in a relatively high temperature below the motor. Compared with the traditional radial ventilation structure, the temperature distribution in the circumferential direction of this patented structure is relatively even. The traditional radial ventilation has a high temperature area at the bottom, while the relative temperature in the circumferential direction of the patented structure is much more balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of a high-speed motor cooling structure of the utility model;

[0010] Figure 2 This is a schematic diagram of the winding stator core structure of the utility model;

[0011] Figure 3 This is a schematic diagram of the structure of the annular middle ventilation groove of the present utility model;

[0012] Figure 4 This is a schematic diagram of the rotor shaft structure of the utility model;

[0013] Figure 5 This is a schematic diagram of the overall structure of the rotor shaft of the present utility model;

[0014] Figure 6 This is a schematic diagram of the new support bar structure of this utility model;

[0015] Figure 7 This is a schematic diagram of the air outlet structure of the utility model;

[0016] Figure 8 This is a schematic diagram of the stator coil structure of the utility model;

[0017] Figure 9 This is the cooling medium flow diagram of the motor of the utility model; DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments:

[0019] Example 1:

[0020] like Figure 1 As shown, a high-speed motor cooling structure includes: a rotor shaft 1, a winding stator core 2, a permanent magnet 3, a magnetic isolation pressure ring 8, an oblique slot 5, and a motor base 10. The rotor shaft 1 is axially provided with an oblique slot 5, a separating rib 9 is provided in the middle of the rotor shaft 1, a permanent magnet 3 is provided on the outside of the rotor shaft 1, the permanent magnet 3 is connected to the magnetic isolation pressure ring 8, the permanent magnet 3 and the magnetic isolation pressure ring 8 are alternately arranged, the permanent magnet 3 and the magnetic isolation pressure ring 8 are both provided with a carbon fiber sheath 7, and a clamping ring is provided on both sides of the rotor shaft 1 6, the clamping ring 6 fastens the permanent magnet 3 and the magnetic isolation pressure ring 8 to the surface of the rotor shaft 1, the permanent magnet 3 includes a side permanent magnet 31 and a side permanent magnet 33, and the width of the side permanent magnet 33 is greater than the width of the side permanent magnet 31; a support bar 20 is provided inside the oblique slot 5, and a gap is provided between the support bar 20 and the bottom of the oblique slot 5; an arc-shaped support bar 17 is provided on the inside of the motor base 10, and the inner side of the support bar 17 is connected to the winding stator core 2, and the support bar 17 is connected to the winding stator core 2. A ventilation gap 18 is provided, stator coils 14 are provided on both sides of the winding stator core 2, an annular middle ventilation groove 11 is provided in the middle of the winding stator core 2, side stator punching sheets 12 are provided on both sides of the annular middle ventilation groove 11, side stator punching sheets 13 are provided on both sides of the side stator punching sheets 12, the thickness of the side stator punching sheets 12 is less than that of the side stator punching sheets 13, the middle parts of the side stator punching sheets 12 and the side stator punching sheets 13 are connected to the fixing strips 15, the side stator punching sheets 12 and the side stator punching sheets 13 are fixed by the fixing strips 15, and the side stator punching sheets 12 and the side stator punching sheets 13 are fixed. The inner sides of the sub-stator punchings 12 and the side stator punchings 13 are connected to the stator coils 14 via teeth. Four oblique slots 5 are provided. Four separating ribs 9 are evenly distributed on the surface of the rotor shaft 1. For the rotor, the oblique slots 5 have gaps, and their bottoms are not completely closed, leaving a certain amount of space. When the rotor rotates, it can create an effect similar to an axial flow fan, causing the internal medium (air or other) to flow along the designed direction of the oblique slots, to a certain extent increasing the flow of medium near the rotor and enhancing the rotor's heat dissipation. Figure 9 is the motor cooling medium streamline diagram; its flow field analysis is as follows Figure 9 shown.

[0021] Example 2:

[0022] The motor base 10 of the motor has air vents 21 on both horizontal sides and in the middle. The motor base 10 of the motor takes in air on both horizontal sides and discharges air in the middle. The wiring of the motor can be connected from the top or bottom, and the wires can be connected from the chassis. The motor has a winding stator core 2 with a wide annular ventilation groove 11 in the middle as an air duct, through which the cooling medium can flow. The stator coil 14 of the motor winding is an inner and outer double-layer coil, which is used to shunt and reduce the skin effect caused by high-frequency current. The thickness of the side stator punching sheet 12 is smaller than that of the side stator punching sheet 13, which can reduce the temperature gradient in the middle and at both ends to a certain extent. The interior of the motor base 10 is a cage-type support structure, and a ventilation gap 18 is set between the support ribs 17 and the winding stator core 2.

[0023] Because the rotor shaft 1 has inclined slots 5, the support bars, when inserted, are positioned at an angle relative to the rotor shaft 1, naturally forming skewed poles. This effectively reduces harmonics and torque fluctuations generated by motor operation, and also reduces motor heating to a certain extent, especially when powered by an inverter.

[0024] For the rotor shaft 1, after the support bar 20 is embedded, its bottom is not completely closed, leaving a certain amount of space. When the rotor shaft 1 rotates, it can form an effect similar to an axial flow fan, causing the internal medium (air or other) to flow along the designed direction, increasing the flow of the medium near the rotor shaft 1. The heat dissipation effect of the rotor shaft 1 is enhanced. Here, the oblique slot 5 is a V-shaped oblique pole. According to the direction of rotation, the air flow flows from both sides to the middle. Compared with the traditional radial ventilation structure, the temperature distribution in the circumferential direction of this application is relatively uniform. The traditional radial ventilation structure has air intake on both sides at the top and air outlet in the middle at the top. There is a high temperature situation below the motor. The traditional radial ventilation has a high temperature area at the bottom, while the relative temperature of the structure in the circumferential direction of this patent is much more balanced.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A high-speed motor cooling structure, characterized by : comprising: a rotor shaft (1), a winding stator core (2), a permanent magnet (3), a magnetic isolation pressure ring (8), an oblique slot (5), and a motor base (10), wherein the rotor shaft (1) is provided with an oblique slot (5) in the axial direction, a separation rib (9) is provided in the middle of the rotor shaft (1), a permanent magnet (3) is provided on the outside of the rotor shaft (1), the permanent magnet (3) is connected to the magnetic isolation pressure ring (8), the permanent magnet (3) and the magnetic isolation pressure ring (8) are alternately provided, and the permanent magnet (3) and the magnetic isolation pressure ring (8) are provided with carbon fiber sheaths (7) on the outside, and clamping rings (6) are provided on both sides of the rotor shaft (1). The clamping rings (6) fasten the permanent magnet (3) and the magnetic isolation pressure ring (8) to the surface of the rotor shaft (1). The permanent magnet (3) includes a side permanent magnet (31) and an edge permanent magnet (33). The width of the edge permanent magnet (33) is greater than the width of the side permanent magnet (31). A support bar (20) is provided inside the oblique slot (5), and a gap is provided between the support bar (20) and the bottom of the oblique slot (5).

2. A high-speed motor cooling structure according to claim 1, characterized in that : A circular arc-shaped support rib (17) is provided on the inner side of the motor base (10), the inner side of the support rib (17) is connected to the winding stator core (2), and a ventilation gap (18) is provided between the support rib (17) and the winding stator core (2).

3. A high-speed motor cooling structure according to claim 1, characterized in that : Stator coils (14) are arranged on both sides of the winding stator core (2), and an annular central ventilation groove (11) is provided in the middle of the winding stator core (2). Side stator punching sheets (12) are arranged on both sides of the annular central ventilation groove (11), and side stator punching sheets (13) are arranged on both sides of the side stator punching sheets (12). The thickness of the side stator punching sheets (12) is smaller than that of the side stator punching sheets (13). The middle parts of the side stator punching sheets (12) and the side stator punching sheets (13) are connected to fixing bars (15), the side stator punching sheets (12) and the side stator punching sheets (13) are fixed by the fixing bars (15), and the inner sides of the side stator punching sheets (12) and the side stator punching sheets (13) are connected to the stator coils (14) through teeth.

4. A high-speed motor cooling structure according to claim 1, characterized in that : There are 4 oblique through slots (5).

5. A high-speed motor cooling structure according to claim 1, characterized in that : There are four separating ribs (9), and the separating ribs (9) are evenly distributed on the surface of the rotor shaft (1).

6. A high-speed motor cooling structure according to claim 1, characterized in that : The motor base (10) has air vents (21) on both sides and in the middle.

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