Rotor device for an electric machine including a cooling fluid line, a collecting ring, and an adapter

Patent metadata

Field	Value
Publication number	US-12580451-B2
Application number	US-202218283136-A
Country	US
Kind code	B2
Filing date	Apr 8, 2022
Priority date	May 3, 2021
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

A rotor device for an electric machine, comprising: a rotor which comprises a rotor laminated core having a plurality of pole legs which project radially from a central axis of the rotor and can be wrapped around by respective rotor windings; at least one cooling fluid line, which extends in the circumferential direction between adjacent pole legs with its longitudinal extension direction parallel to the central axis of the rotor, and which is designed for a cooling fluid to flow through it for cooling of the rotor; and at least one collecting ring, which is provided on an end face of the rotor and is designed to collect cooling fluid flowing along the end face and to supply it to the at least one cooling fluid line.

First claim

The invention claimed is:

1 . A rotor device for an electric machine, comprising:
a rotor which comprises a laminated rotor core that comprises a plurality of pole limbs which project radially from a central axis of the rotor and around which respective rotor windings can be wound; at least one cooling fluid line which extends in a circumferential direction between adjacent pole limbs with its direction of longitudinal extent parallel to the central axis of the rotor and which is configured such that a cooling fluid flows through it for cooling the rotor; and at least one collecting ring that is arranged on an end face of the rotor and which is designed to collect cooling fluid flowing along the end face and to provide the cooling fluid for the at least one cooling fluid line, wherein the collecting ring for the at least one cooling fluid line has a fluid opening in which an adapter is inserted, the adapter being designed to supply the cooling fluid collected by the collecting ring to the respective cooling fluid line adjoining the adapter, and wherein the adapter has a slot which is designed to form a form fit with a rotor potting compound of the rotor.

2 . The rotor device according to claim 1 ,
wherein one or more of the at least one cooling fluid lines is provided in the circumferential direction for each intermediate space between adjacent pole limbs, the cooling fluid lines each being designed to convey the cooling fluid in an opposite direction to the cooling fluid lines which are directly adjacent in the circumferential direction.

3 . The rotor device according to claim 1 ,
wherein each cooling fluid line is integrated in a respective cover slide.

4 . The rotor device according to claim 1 ,
wherein the at least one cooling fluid line has a length portion in which the cooling fluid line is surrounded circumferentially by a rotor potting compound.

5 . The rotor device according to claim 1 ,
wherein the rotor device comprises a hollow shaft on which the rotor is held for conjoint rotation and which predetermines an axis of rotation of the rotor, the hollow shaft being designed for the cooling fluid to flow through it, and the hollow shaft having at least one radial opening via which the cooling fluid can flow out of the hollow shaft in order to flow to the at least one cooling fluid line.

6 . The rotor device according to claim 5 ,
wherein the at least one collecting ring surrounds the hollow shaft circumferentially and is designed to collect the cooling fluid, which has emerged via the at least one radial opening in the hollow shaft, and to provide the cooling fluid for the at least one cooling fluid line.

7 . The rotor device according to claim 1 ,
wherein the collecting ring has a channel which runs in the circumferential direction, is open toward the hollow shaft and in which the collected cooling fluid can be held by centrifugal force.

8 . The rotor device according to claim 1 ,
wherein, on each cooling fluid line there is arranged an outlet element via which the cooling fluid, after flowing through the respective cooling fluid line, can flow out from the latter, the outlet element being configured to deflect the cooling fluid outward in a radial direction.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Krank Benjamin
• Strasinsky Simon
• Wolf Bernhard

Classifications

• H02K1/24

  Rotor cores with salient poles {; Variable reluctance rotors} · CPC title

• H02K1/325

  between salient poles · CPC title

• H02K3/527

  applicable to rotors only · CPC title

• H02K9/19 Primary

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title