Outer rotor oil-cooled permanent magnet synchronous motor

Abstract

The application relates to an outer-rotor oil-cooled permanent magnet synchronous motor, and solves the problems of the water-cooled and inner-rotor permanent magnet synchronous motor used by a new energy heavy truck. The motor comprises a shell, a rotor, magnetic steel, a stator, bearing I, bearing II, an oil inlet, a radial oil outlet A, a stator oil channel, a radial oil outlet B, an axial oil outlet, winding 12A, winding 12B, a rotor oil channel and an oil return port. The magnetic steel is fixed to the inner surface of the rotor, the rotor is fixed in the shell through the bearing I and the bearing II, the winding 12A and the winding 12B are embedded in the stator, the stator is fixed to the shell, cooling oil flows in through the oil inlet, part of the cooling oil is sprayed to the winding 12A through the radial oil outlet A, the remaining part of the cooling oil flows through the stator through the stator oil channel, part of the cooling oil flowing through the stator is sprayed to the winding 12B through the radial oil outlet B, the remaining part of the cooling oil is sprayed out through the axial oil outlet, the cooling oil flowing out of the axial oil outlet, the radial oil outlet B and the radial oil outlet A flows out through the oil return port. The motor can improve the power density and the torque density.

Description

Technical Field

[0001] This invention relates to an electric motor, specifically to an external rotor oil-cooled permanent magnet synchronous motor. Background Technology

[0002] Pure electric vehicles, with their advantages of convenience, energy efficiency, environmental friendliness, and superior acceleration performance, have gained widespread recognition and favor from users in recent years, driven by policy support. Their market share and production-to-sales ratio have increased year by year. As a core component of pure electric vehicles, the performance of the drive motor directly impacts the overall vehicle's operating performance and reflects the vehicle manufacturer's technological R&D capabilities. Compared to internal rotor permanent magnet synchronous motors, external rotor permanent magnet synchronous motors, within the same volume, offer greater output torque. Combined with oil cooling, this further enhances the motor's power and torque density.

[0003] Currently, the drive motors used in new energy heavy trucks are mainly water-cooled, internal rotor permanent magnet synchronous motors. Water cooling is less effective than oil cooling, and for the same volume, the output torque of an internal rotor permanent magnet synchronous motor is smaller than that of an external rotor motor. Summary of the Invention

[0004] This invention provides an external rotor oil-cooled permanent magnet synchronous motor, which solves the problems of water cooling in current new energy heavy trucks, poor cooling effect of internal rotor permanent magnet synchronous motors compared to oil cooling, and smaller output torque compared to external rotor motors.

[0005] This invention is achieved through the following technical solutions:

[0006] An external rotor oil-cooled permanent magnet synchronous motor includes a housing 1, a rotor 2, magnets 3, a stator 4, bearings I5 and II6, an oil inlet 7, a radial oil outlet A8, a stator oil passage 9, a radial oil outlet B10, an axial oil outlet 11, windings 12A and 12B, a rotor oil passage 13, and an oil return port 14. Magnets 3 are fixed to the inner surface of the rotor 2. The rotor 2 is fixed to the housing 1 via bearings I5 and II6. Windings 12A and 12B are embedded in the stator 4, and the stator 4 is fixed to the housing 1. Cooling oil is supplied through... The oil flows in through the inlet 7, and part of it is sprayed onto the winding 12A through the radial outlet A8. The rest flows through the stator oil passage 9 and passes through the stator 4. Part of the cooling oil flowing through the stator 4 is sprayed onto the winding 12B through the radial outlet B10, and the rest is sprayed out through the axial outlet 11. The cooling oil sprayed out through the axial outlet 11 and the cooling oil sprayed out through the radial outlet B10 flow outward with the rotation of the rotor 2. Finally, it flows to the other side through the rotor oil passage 13 and flows out through the return oil port 14 together with the cooling oil flowing out through the radial outlet A8.

[0007] Compared to the problems of low power density and low output torque of traditional water-cooled internal rotor drive motors, this invention can improve the power density and torque density of the motor. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the present invention;

[0009] Figure 2 yes Figure 1 BB view. Detailed Implementation

[0010] like Figure 1 , 2 As shown, this invention is an external rotor oil-cooled permanent magnet synchronous motor, comprising a housing 1, a rotor 2, magnets 3, a stator 4, bearings I5 and II6, an oil inlet 7, a radial oil outlet A8, a stator oil passage 9, a radial oil outlet B10, an axial oil outlet 11, windings 12A and 12B, a rotor oil passage 13, and an oil return port 14. Magnets 3 are fixed to the inner surface of the rotor 2. The rotor 2 is fixed to the housing 1 via bearings I5 and II6. Windings 12A and 12B are embedded in the stator 4, and the stator 4 is fixed to the housing 1. Cooling... Oil flows in through the oil inlet 7, part of which is sprayed onto the winding 12A through the radial oil outlet A8, and the rest flows through the stator oil passage 9 through the stator 4. Part of the cooling oil flowing through the stator 4 is sprayed onto the winding 12B through the radial oil outlet B10, and the rest is sprayed out through the axial oil outlet 11. The cooling oil sprayed out through the axial oil outlet 11 and the cooling oil sprayed out through the radial oil outlet B10 flow outward with the rotation of the rotor 2, and finally flows to the other side through the rotor oil passage 13, and flows out through the return oil outlet 14 together with the cooling oil flowing out through the radial oil outlet A8.

[0011] This invention relates to an external rotor permanent magnet synchronous motor for commercial vehicles, which has a larger output torque compared to an internal rotor motor. The stator and rotor oil circuit design allows for oil cooling of the stator core, windings, and rotor, thereby increasing the motor's power density.

Claims

1. An external rotor oil-cooled permanent magnet synchronous motor, characterized in that: The components include a housing (1), a rotor (2), a magnet (3), a stator (4), bearing I (5), bearing II (6), an oil inlet (7), a radial oil outlet A (8), a stator oil passage (9), a radial oil outlet B (10), an axial oil outlet (11), winding I (12A), winding II (12B), a rotor oil passage (13), and an oil return port (14). The magnet (3) is fixed to the inner surface of the rotor (2). The rotor (2) is fixed in the housing (1) through bearing I (5) and bearing II (6). Winding I (12A) and winding II (12B) are embedded in the stator (4). The stator (4) is fixed to the housing (1). Cooling oil flows in through the inlet (7), part of it is sprayed onto winding I (12A) through the radial outlet A (8), and the rest flows through the stator (4) through the stator oil passage (9). Part of the cooling oil flowing through the stator (4) is sprayed onto winding II (12B) through the radial outlet B (10), and the rest is sprayed out through the axial outlet (11). The cooling oil sprayed out through the axial outlet (11) and the cooling oil sprayed out through the radial outlet B (10) flow outward with the rotation of the rotor (2), and finally flows to the other side through the rotor oil passage (13), and flows out through the return oil port (14) together with the cooling oil flowing out through the radial outlet A (8).

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