CN-122001120-A - Rotary machine

Abstract

The invention provides a rotary machine capable of improving torque. The rotary machine includes a cylindrical stator, a rotor provided with a gap from the stator in a radial direction of the stator, and oil impregnating a part of the rotor and a part of the stator. Oil is supplied to the gap. The oil contains a magnetic powder having a particle diameter smaller than the width of the gap in the radial direction of the stator.

Inventors

• AKITA MITSUTOSHI

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251022

Priority Date

20241101

Claims (3)

1. 1. A rotary machine comprising a cylindrical stator, a rotor provided with a gap from the stator in the radial direction of the stator, and oil impregnating a part of the rotor and a part of the stator, characterized in that, The oil is supplied in the gap, The oil contains a magnetic powder having a particle diameter smaller than the width of the gap in the radial direction of the stator.
2. 2. The rotary machine according to claim 1, wherein, The particle diameter of the magnetic powder is 1/10 or more and 1/2 or less of the width of the gap in the radial direction of the stator.
3. 3. The rotary machine according to claim 1, wherein, The total of the volume of the magnetic powder and the volume of the oil is 10% -50%.

Description

Rotary machine Technical Field The present invention relates to a rotary machine. Background Conventionally, as such a technical field, there is a technique described in patent document 1, for example. The rotary machine described in patent document 1 is a radial gap motor including a cylindrical stator, a rotor disposed on an inner peripheral side of the stator with a gap therebetween, and oil impregnating a part of the rotor and a part of the stator. In this rotary machine, in order to suppress foaming of oil supplied to a gap between the rotor and the stator, a groove portion for expanding the gap at a position overlapping with the oil surface in the stator is formed. Patent document 1 Japanese patent laid-open No. 2009-183047 Disclosure of Invention In the case of the rotary machine described above, in order to prevent breakage due to contact between the rotor and the stator, a gap needs to be provided between the rotor and the stator. However, by providing the gap, the torque of the rotary machine is affected, and the torque is hardly increased. In particular, when the gap is large, the influence of the torque on the rotating machine is also large, and thus the torque is prevented from being increased. The present invention has been made to solve the above technical problems, and an object of the present invention is to provide a rotary machine capable of improving torque. The present invention relates to a rotary machine comprising a cylindrical stator, a rotor provided with a gap from the stator in the radial direction of the stator, and oil impregnating a part of the rotor and a part of the stator, wherein the gap is supplied with the oil, and the oil contains magnetic powder having a particle diameter smaller than the width of the gap in the radial direction of the stator. In the rotary machine according to the present invention, oil containing magnetic powder having a particle diameter smaller than the width of the gap in the radial direction of the stator is supplied to the gap between the rotor and the stator. By the magnetic powder, the width of the gap between the rotor and the stator is reduced in a similar manner, and therefore, the torque can be improved. Further, since the particle diameter of the magnetic powder is smaller than the width of the gap, the influence of the magnetic powder on the rotation of the rotor can be suppressed. In the rotary machine according to the present invention, the particle diameter of the magnetic powder is preferably 1/10 or more and 1/2 or less of the width of the gap in the radial direction of the stator. In this way, the influence on the rotation of the rotor and the obstruction to the flow of oil due to the accumulation of the magnetic powders can be prevented while suppressing the increase in the manufacturing cost of the magnetic powders. In the rotary machine according to the present invention, the total of the volume of the magnetic powder and the volume of the oil is preferably 10% to 50%. In this way, the effect of improving the torque of the rotary machine can be maintained, and the influence on the flow of oil can be suppressed. Effects of the invention According to the present invention, the torque of the rotary machine can be increased. Drawings Fig. 1 is a schematic plan view illustrating a rotary machine according to an embodiment. Fig. 2 is a schematic plan view for explaining the rotor, the stator, and oil supplied into a gap between the rotor and the stator. Fig. 3 (a) is a schematic plan view showing a rotary machine according to an example (an inventive product), and fig. 3 (b) is a schematic plan view showing a rotary machine according to a comparative example (a conventional product). Fig. 4 is a graph for explaining the results of torque analysis of examples (inventive products) and comparative examples (conventional products). Detailed Description Hereinafter, embodiments of a rotary machine according to the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repetitive description thereof will be omitted. Fig. 1 is a schematic plan view showing a rotary machine according to an embodiment, and fig. 2 is a schematic plan view for explaining a rotor, a stator, and oil supplied to a gap between the rotor and the stator. As shown in fig. 1, a rotary machine 1 according to the present embodiment is a so-called radial gap motor, and is used as an electric vehicle motor, for example. The rotary machine 1 includes a cylindrical stator 2, a rotor 3 provided on the inner peripheral side of the stator 2 and rotatable with respect to the stator 2, a rotary shaft 4 fitted into a shaft hole of the rotor 3, and oil 6 (see fig. 2) impregnating a part of the rotor 3 and a part of the stator 2. The stator 2 includes, for example, a stator core 21 formed by laminating a plurality of annular electromagnetic steel plates in the axial dire