Winding field motor

Abstract

To provide a winding field motor which can effectively cool a coil end while reducing dragging loss.SOLUTION: A winding field motor comprises: a rotor; a coil wound around the rotor; and an end ring attached to a coil end of the coil and to which coolant is supplied, wherein at least one through hole is provided on an end surface in an axial direction of the end ring.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a wound-field magnet motor.

Background Art

[0002] In a wound-field magnet motor, a configuration is disclosed in which a through hole is provided in the radial surface of an end ring attached to a rotor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technology proposed in Patent Document 1, there is a risk that the refrigerant flows into the air gap (gap) between the rotor and the stator, increasing the sliding loss.

[0005] The present disclosure has been made in view of the above, and an object thereof is to provide a wound-field magnet motor capable of effectively cooling the coil ends while reducing the sliding loss.

Means for Solving the Problems

[0006] The wound-field magnet motor according to the present disclosure includes a rotor, a coil wound around the rotor, and an end ring attached to the coil end of the coil and supplied with a refrigerant, and at least one through hole is provided in an axial end surface of the end ring.

Effects of the Invention

[0007] According to the present disclosure, by providing a through hole in the axial end face of the end ring, it is possible to suppress the inflow of the refrigerant into the air gap between the rotor and the stator. Thereby, while reducing the sliding loss, the coil end can be effectively cooled.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0009] The wound field magnet motor according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the components in the following embodiments include those that can be replaced and are easy for those skilled in the art, or those that are substantially the same.

[0010] The configuration of the wound field magnet motor according to the embodiment will be described with reference to FIGS. 1 and 2. The wound field magnet motor according to the embodiment is, for example, a power source of a vehicle. The wound field magnet motor according to the embodiment is mounted on, for example, a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), etc. Further, the wound field magnet motor according to the embodiment may be mounted on, for example, a fuel cell electric vehicle (FCEV), a battery electric vehicle (BEV), etc.

[0011] The wound field magnet motor according to the embodiment includes a rotor 1, a shaft 2, and a stator. Note that in FIGS. 1 and 2, the stator is not shown. The rotor 1 includes a rotor core 11, a coil 12, and an end ring 13.

[0012] The rotor core 11 is formed in a cylindrical shape and is composed of a plurality of laminations in the axial direction. The rotor core 11 is provided with a plurality of teeth protruding in the radial direction, and a coil 12 is wound around each tooth. Further, a shaft 2 is attached inside the cylinder of the rotor core 11.

[0013] The coil 12 is wound around a plurality of teeth of the rotor core 11. A thermosetting resin is filled between the coils 12 wound around the plurality of teeth. Further, the coil ends of the coil 12 are exposed from this thermosetting resin.

[0014] The end ring 13 is attached to the axial end of the coil 12 (hereinafter referred to as the "coil end"). This end ring 13 functions as a strength member against centrifugal force and also functions as a member for improving the cooling efficiency of the coil end. Further, the end ring 13 includes an annular flange portion 131 which is a flat portion in the radial direction.

[0015] A refrigerant (for example, oil, etc.) is supplied into the end ring 13 from a refrigerant supply device (not shown). The specific configuration of this refrigerant supply device is not particularly limited. For example, a device provided with a nozzle for directly injecting the refrigerant into the coil end may be used, or a device for supplying the refrigerant to the shaft 2 may also be used. For example, as shown in FIG. 1, when the refrigerant is injected from the refrigerant supply device toward the coil end, due to the centrifugal force during the rotation of the rotor 1, the refrigerant is supplied into the flange portion 131 of the end ring 13 and stays there. Thereby, the coil end can be covered with the refrigerant and the coil end can be cooled.

[0016] At least one through hole 132 is provided in the axial end face of the end ring 13, that is, in the flange portion 131. A total of 4 through holes 132 are provided in FIG. 1, but for example, depending on the amount of refrigerant supplied into the end ring 13, etc., the total may be 3 or less, or may be 5 or more.

[0017] The through-hole 132 is for discharging the refrigerant that has stayed inside the end ring 13 to the outside. This through-hole 132 is provided so as to penetrate the flange portion 131. As shown in the figure, the refrigerant that has stayed inside the end ring 13 for a certain period of time is discharged from the through-hole 132.

[0018] The shaft 2 is attached to the rotor core 11 via bearings (not shown) and the like. This shaft 2 is fixed to the rotor core 11 and is configured to be rotatable integrally with the rotor core 11.

[0019] Here, for example, in the case of an end ring that does not have a flange portion 131 (is not a flange structure) such as in the present embodiment, since the refrigerant does not stay inside the end ring, the refrigerant does not sufficiently cover the coil end, and the cooling efficiency deteriorates. Also, for example, when no through-hole is provided in the end ring, since the refrigerant does not circulate, the refrigerant with an increased temperature continues to stay inside the end ring, and the cooling efficiency deteriorates.

[0020] On the other hand, in the wound field magnet motor according to the embodiment, by providing the through-hole 132 in the axial end face of the end ring 13, that is, the flange portion 131, it is possible to suppress the inflow of the refrigerant into the air gap between the rotor 1 and the stator. Thereby, while reducing the sliding loss, the coil end can be effectively cooled.

[0021] That is, in the wound field magnet motor according to the embodiment, the end ring 13 that complements the centrifugal force resistance strength of the rotor 1 is made into a flange structure where the refrigerant accumulates. Thus, in addition to the strength complementing effect, it has a cooling capacity improvement effect and can suppress the deterioration of the electricity cost. Also, by setting the through-hole 132 for discharging the refrigerant in the end ring 13 in the axial direction, the circulation of the refrigerant is promoted.

[0022] Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

Explanation of Signs

[0023] 1 Rotor 11 Rotor Core 12 Coil 13 End Ring 131 Flange Portion 132 Through-Hole 2 Shaft

Claims

【Claim 1】 A rotor, a coil wound around the rotor, an end ring attached to the coil ends of the coil and supplied with a refrigerant, comprising: at least one through hole is provided in an axial end face of the end ring, a wound-field magnet motor.

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