Water-cooled built-in permanent magnet synchronous motor

Abstract

The utility model discloses a water-cooling built-in permanent magnet synchronous motor. The motor comprises a rotor shaft, a front bearing assembly installed at the front end of the rotor shaft, a rear bearing assembly installed at the rear end of the rotor shaft, a front end cover for fixing the front bearing assembly, a rear end cover for fixing the rear bearing assembly, a rotor iron core fixed to the rotor shaft, and a stator iron core matched with the rotor iron core. The motor base is provided with a cavity, the water cooling assembly is arranged between the motor base and the stator iron core, the rotor shaft, the rotor iron core and the stator iron core are all accommodated in the cavity, the front end cover and the rear end cover are fixed on the motor base, a plurality of magnetic steels are embedded in the rotor iron core, and the water cooling assembly comprises a water retaining strip and a water channel; wherein a fan is fixed on the rotor shaft, and the water-cooling built-in permanent magnet synchronous motor further comprises a plurality of ventilating ducts which are matched with the fan to form circulating air in the cavity, so that the water-cooling built-in permanent magnet synchronous motor has a cooling effect on the magnetic steel.

Description

Technical Field

[0001] The utility model relates to the technical field of synchronous motors, in particular to a water-cooled built-in permanent magnet synchronous motor. Background Art

[0002] Generally, the IC3W7 water-cooled machine base adopts a structure with a water jacket on the machine base, that is: the machine base is divided into two layers, and water baffle strips are arranged between the two layers to form a labyrinth water channel structure. Cooling water is passed through the water channel, so the machine base has a good cooling effect. However, since the machine base is the cooling source, it has almost no direct cooling effect on the rotor core, resulting in poor guarantee of the temperature rise of the rotor core. For a built-in permanent magnet synchronous motor, magnets are embedded in the rotor core. When the temperature gradually rises and even exceeds the temperature resistance limit of the magnets, the magnets, which are the core of the motor, will demagnetize, resulting in motor failure. Content of the Utility Model

[0003] The purpose of the utility model is to provide a water-cooled built-in permanent magnet synchronous motor.

[0004] To achieve the above-mentioned utility model purpose, the utility model adopts the following technical scheme: A water-cooled built-in permanent magnet synchronous motor, which includes a rotor shaft, a front bearing assembly installed at the front end of the rotor shaft, a rear bearing assembly installed at the rear end of the rotor shaft, a front end cover for fixing the front bearing assembly, a rear end cover for fixing the rear bearing assembly, a rotor core fixed to the rotor shaft, a stator core cooperating with the rotor core, a machine base having a cavity, and a water-cooling assembly arranged between the machine base and the stator core. The rotor shaft, the rotor core, and the stator core are all received in the cavity. The front end cover and the rear end cover are fixed to the machine base. A number of magnets are embedded in the rotor core. The water-cooling assembly includes water baffle strips and water channels. Wherein, a fan is fixed on the rotor shaft, and the water-cooled built-in permanent magnet synchronous motor further includes a number of ventilation channels that cooperate with the fan to form a circulating air flow in the cavity.

[0005] As a further improved technical scheme of the utility model, the fan is a centrifugal fan sleeved on the rotor shaft and adjacent to the front end cover and / or the rear end cover.

[0006] As a further improved technical scheme of the utility model, a number of the ventilation channels are symmetrically distributed along the circumference of the rotor shaft.

[0007] As a further improved technical scheme of the utility model, there are 6 ventilation channels, which extend along the axial direction of the rotor shaft respectively.

[0008] As a further improved technical solution of the present utility model, an X-axis - Y-axis coordinate system perpendicular to each other is set with the axis of the rotor shaft as the origin. The 4 ventilation ducts are symmetrically distributed at an angle of 25° with the X-axis, and the 2 ventilation ducts are symmetrically distributed at an angle of 25° with the Y-axis.

[0009] As a further improved technical solution of the present utility model, several mutually welded steel plates form the ventilation duct.

[0010] As a further improved technical solution of the present utility model, both ends of the ventilation duct are respectively connected to both ends of the stator core.

[0011] As a further improved technical solution of the present utility model, the ventilation duct is arranged on the outer wall of the water channel, and at least part of the outer wall of the water channel is the inner wall of the ventilation duct.

[0012] As a further improved technical solution of the present utility model, there is a gap between the machine base and the water retaining strip, and the gap forms an outer air path for the circulating air to pass through.

[0013] As a further improved technical solution of the present utility model, the water-cooled built-in permanent magnet synchronous motor is a medium-speed motor.

[0014] The beneficial effect of the present utility model is that a fan is fixed on the rotor shaft, and the water-cooling component further includes several ventilation ducts that cooperate with the fan to form circulating air in the cavity, thereby improving the cooling effect on the magnetic steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the rotor water-cooled built-in permanent magnet synchronous motor of the present utility model;

[0016] Figure 2 is Figure 1 a partial sectional view schematic diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be described in detail below in conjunction with the embodiments shown in the drawings. Please refer to the drawings, which are the preferred embodiments of the present utility model. However, it should be noted that these embodiments are not limitations to the present utility model, and any equivalent transformation or substitution in terms of function, method, or structure made by those of ordinary skill in the art according to these embodiments shall fall within the protection scope of the present utility model.

[0018] Please refer to Figure 1 and Figure 2, the present utility model discloses a water-cooled built-in permanent magnet synchronous motor 100, which includes a rotor shaft 1, a front bearing assembly 21 installed at the front end of the rotor shaft 1, a rear bearing assembly 22 installed at the rear end of the rotor shaft 1, a front end cover 31 for fixing the front bearing assembly 21, a rear end cover 32 for fixing the rear bearing assembly 22, a rotor core 4 fixed to the rotor shaft 1, a stator core 5 cooperating with the rotor core 4, a frame 6 having a cavity 61, and a water-cooling assembly 7 located between the frame 6 and the stator core 5. The rotor shaft 1, the rotor core 4, and the stator core 5 are all accommodated in the cavity 61. The front end cover 31 and the rear end cover 32 are fixed to the frame 6. A plurality of magnetic steels (not shown) are embedded in the rotor core 4. The water-cooling assembly 7 includes a water baffle 71 and a water channel 72. Among them, a fan 8 is fixed on the rotor shaft 1. The water-cooled built-in permanent magnet synchronous motor 100 further includes a plurality of ventilation ducts 9 that cooperate with the fan 8 to form a circulating air flow in the cavity 61, thereby improving the cooling effect of the magnetic steels, preventing demagnetization due to overheating, and ensuring the quality stability of the water-cooled built-in permanent magnet synchronous motor 100.

[0019] Further, the fan 8 is a centrifugal fan sleeved on the rotor shaft 1 and adjacent to the front end cover 31 and / or the rear end cover 32. A centrifugal fan can be sleeved on the rotor shaft 1 adjacent to the front end cover 31, or a centrifugal fan can be sleeved on the rotor shaft 1 adjacent to the rear end cover 32, or a centrifugal fan can be sleeved on the rotor shaft 1 adjacent to the front end cover 31 and the rear end cover 32 respectively, or two centrifugal fans are symmetrically distributed along the circumference of the rotor shaft 1.

[0020] Further, the plurality of ventilation ducts 9 are symmetrically distributed along the circumference of the rotor shaft 1. In one embodiment, there are 6 ventilation ducts, which extend along the axial direction of the rotor shaft 1 respectively. Taking the axis of the rotor shaft 1 as the origin, an X-axis - Y-axis coordinate system perpendicular to each other is set. 4 ventilation ducts 9 are symmetrically distributed at an angle of 25° with the X-axis, of which 2 are symmetric with respect to the negative X-axis and 2 are symmetric with respect to the positive X-axis; the other 2 ventilation ducts 9 are symmetrically distributed at an angle of 25° with the positive Y-axis. Thus, a stable circulating air flow is formed to improve the heat dissipation effect.

[0021] Further, a plurality of mutually welded steel plates form the ventilation ducts 9. The two ends of the ventilation ducts 9 are respectively connected to the two ends of the stator core 5. The water channels 72 are distributed in a labyrinth pattern between the water baffles 71. The ventilation ducts 9 are arranged on the outer wall of the water channels 72. At least part of the outer wall of the water channels 71 is the inner wall of the ventilation ducts 9, which improves the heat dissipation effect.

[0022] Further, there is a gap between the frame 6 and the water baffle 71, and the gap forms an outer air path for the circulating air flow to pass through, which improves the heat dissipation effect.

[0023] Furthermore, the water-cooled built-in permanent magnet synchronous motor 100 is a medium-speed (500 rpm, 600 rpm, 1000 rpm, 1500 rpm) motor, which can effectively avoid the safety accident of demagnetization of the magnetic steel caused by the high temperature of the rotor core 4.

[0024] The present utility model discloses a water-cooled built-in permanent magnet synchronous motor 100, on which a fan 8 is fixed on the rotor shaft 1, and six ventilation ducts 9 are arranged on the outer wall of the water channel 72 in a left-right symmetrical form along the circumference. The ventilation ducts 9 are welded by steel plates, and the ventilation ducts are connected to the head and tail ends of the stator core 5. The inner wall of the ventilation duct 9 is the outer wall of the water channel 72. When the motor rotates, the centrifugal fan blows air into the rear inlet of the ventilation duct 9, and the hot air is cooled by the outer wall of the water channel 72 and its temperature drops. Then the air enters the motor cavity from the front of the motor, and then the air passes through the rotor core 4, takes away the heat of the magnetic steel in the rotor core 4, and reaches the fan, and then enters the ventilation duct 9 again, thus forming a circulating air. Moreover, when the cooling air passes through the end part of the motor winding, it can also play a certain cooling effect on the end part of the motor winding.

[0025] It should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0026] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present utility model, and they are not used to limit the protection scope of the present utility model. Any equivalent embodiments or changes made without departing from the technical spirit of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A water-cooled internal permanent magnet synchronous motor, characterized in that: It includes a rotor shaft, a front bearing assembly installed at the front end of the rotor shaft, a rear bearing assembly installed at the rear end of the rotor shaft, a front end cover for fixing the front bearing assembly, a rear end cover for fixing the rear bearing assembly, a rotor core fixed to the rotor shaft, a stator core matched with the rotor core, a base with a cavity and a water cooling assembly arranged between the base and the stator core, the rotor shaft, the rotor core and the stator core are all accommodated in the cavity, the front end cover and the rear end cover are fixed to the base, a plurality of magnetic steels are inlaid in the rotor core, and the water cooling assembly includes a water retaining strip and a water channel; wherein a fan is fixed on the rotor shaft, and the water-cooled internal permanent magnet synchronous motor also includes a plurality of ventilation ducts that cooperate with the fan to form circulating wind in the cavity.

2. The water-cooled interior permanent magnet synchronous motor according to claim 1, characterized in that: The fan is a centrifugal fan which is sleeved on the rotor shaft and is adjacent to the front cover and / or the rear cover.

3. The water-cooled interior permanent magnet synchronous motor according to claim 1, characterized in that: The plurality of ventilation passages are symmetrically distributed along the circumference of the rotor shaft.

4. The water-cooled interior permanent magnet synchronous motor according to claim 3, characterized in that: There are six ventilation passages, each extending along the axial direction of the rotor shaft.

5. The water-cooled interior permanent magnet synchronous motor according to claim 4, characterized in that: Mutually perpendicular X-axis-Y-axis coordinates are set with the axis center of the rotor shaft as the origin, the four ventilation ducts are symmetrically distributed at an angle of 25° with the X-axis, and the two ventilation ducts are symmetrically distributed at an angle of 25° with the Y-axis.

6. The water-cooled interior permanent magnet synchronous motor according to claim 1, characterized in that: The ventilation duct is formed by a plurality of steel plates welded to each other.

7. The water-cooled interior permanent magnet synchronous motor according to claim 1, characterized in that: Two ends of the ventilation duct are respectively connected to two ends of the stator core.

8. The water-cooled interior permanent magnet synchronous motor according to claim 1, characterized in that: The ventilation channel is arranged on the outer wall of the water channel, and at least a part of the outer wall of the water channel is the inner wall of the ventilation channel.

9. The water-cooled interior permanent magnet synchronous motor according to claim 1, characterized in that: There is a gap between the base and the water retaining strip, and the gap forms an external wind path for circulating wind to pass through.

10. The water-cooled interior permanent magnet synchronous motor according to claim 1, characterized in that: The water-cooled internal permanent magnet synchronous motor is a medium-speed motor.

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