Rotary machine

Patent metadata

Field	Value
Publication number	US-8928195-B2
Application number	US-201113642328-A
Country	US
Kind code	B2
Filing date	Apr 22, 2011
Priority date	Apr 23, 2010
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

On an inner circumference side of a stator fixed in an inner housing, a rotor is arranged. The rotor rotates through a bearing with respect to a center shaft that is a stationary shaft fixed to outer housings. Oil introduced into a rotor oil inlet path in the center shaft flows through a communication path and a clearance on an outer circumference of the center shaft into an oil path in the rotor. The oil flowing through the oil path cools a permanent magnet, lubricates the bearing, and is discharged from a rotor oil discharge port to the outside of the inner housing. The oil in the clearance is sealed with a thread seal, i.e., an inner thread formed in an inner face of an end ring and is prevented from flowing toward the bearing.

First claim

The invention claimed is:

1. A rotary machine comprising:
a housing in which a stator is fixed;
an outer housing attached to an outer side of the housing;
a rotor shaft that horizontally passes through the housing and has both ends fixed to the outer housing;
a rotor that is arranged inside the housing, is supported to be rotatable relative to the rotor shaft, and is rotated by the stator;
a rotor shaft coolant path formed inside the rotor shaft and including an inlet exposed to the outside of the outer housing to take in a coolant from the outside of the rotor shaft and an exit communicating with an annular clearance between the rotor shaft and the rotor for passing the coolant taken in from the inlet to the annular clearance; and
a rotor coolant path formed inside the rotor and including an intake communicating with the annular clearance and a discharge port arranged outside the housing for discharging the coolant taken through the intake to a space between the housing and the outer housing.

2. The rotary machine as set forth in claim 1 , further comprising
an accommodation hole formed inside the rotor and accommodating a permanent magnet,
wherein the rotor has a rotor core whose ends in an axial direction of the rotor shaft are held between a pair of end rings,
the rotor coolant path includes:
an inlet path and an outlet path that are formed inside the pair of end rings and communicate with the intake and discharge port; and
a gap path that is formed between the accommodation hole and the permanent magnet and interconnects the inlet path and the outlet path to each other.

3. The rotary machine as set forth in claim 1 , wherein
a plurality of rotor coolant paths are arranged at intervals in a rotation direction of the rotor, to pass the coolant in different directions along the rotor shaft.

4. The rotary machine as set forth in claim 1 , further comprising
a bearing that rotatably supports the rotor with respect to the rotor shaft and has an end face arranged outside the housing, wherein
the rotor coolant path includes an inner space that is defined inside the bearing, open to the end face, communicates with the discharge port, and passes the coolant that has passed through an outlet path.

5. The rotary machine as set forth in claim 4 , wherein
the rotor has a rotor core whose ends in an axial direction of the rotor shaft are held between a pair of end rings,
the bearing is attached to an outer side in the axial direction of an end ring,
an inner circumferential face of each of the end rings has a spiral groove, the rotor shaft passes through the end ring, the inner circumferential face is opposed to a circumferential face of the rotor shaft, and wherein the spiral groove is configured to move the coolant in the annular clearance from the bearing toward the intake by way of the rotation of the rotor.

6. The rotary machine as set forth in claim 1 , wherein
the rotor coolant path includes a diametral path arranged in the rotor is central in the axial direction of the rotor shaft and extends in a diametral direction of the rotor shaft and
a pair of axial paths that communicate with the diametral path and extend up to axial ends of the rotor.

7. The rotary machine as set forth in claim 1 , wherein:
the stator includes a stator core and a coil that is attached to the stator core so that a coil end protrudes from each end of the stator core and the rotary machine further comprises:
a mold member that is formed at each end of the stator core so as to cover a base part of the coil end; and
a partition that is in contact with the mold member and separates a first space in which the rotor is arranged from a second space in which the coil end is arranged.

8. The rotary machine as set forth in claim 7 , further comprising:
a mold member formed inside the stator core to fill a gap inside a slot that is formed in the stator core to accommodate the coil, wherein
the mold member formed at each end of the stator core and the mold member formed inside the stator core are made of materials having different thermal conductivities.

9. The rotary machine as set forth in claim 1 , wherein
the rotor has a rotary body rotatably supported with respect to the rotor shaft and a sleeve attached to an outer circumferential face of the rotary body,
an outer circumferential face of the sleeve is attached to a rotor core formed by layering a plurality of magnetic steel sheets, and
a recess serving as a coolant path for guiding the coolant is formed in at least one of the outer circumferential face of the rotary body and an inner circumferential face of the sleeve.

10. The rotary machine as set forth in claim 9 , wherein
the rotary body has a first rotary body that has a first path for axially guiding the coolant and a second rotary body that has a larger diameter than the first rotary body and contains an internal second path to connect the first path to the recess coolant path and the recess is formed in an outer circumferential face of the second rotary body.

11. The rotary machine as set forth in claim 9 , wherein
the recess is formed in the same number as the number of the permanent magnets arranged in the rotor.

12. The rotary machine as set forth in claim 11 , wherein
the rotary body and sleeve are positioned in the rotation direction of the rotor so that the recesses come as close as possible to the permanent magnets, respectively.

Assignees

• Ohashi Satoru
• Handa Norihisa
• Yamasaki Shusaku
• Tanida Masahiro
• Ishimoto Koushi
• Shito Motoaki
• Ihi Corp

Inventors

• Ohashi Satoru
• Handa Norihisa
• Yamasaki Shusaku
• Tanida Masahiro
• Ishimoto Koushi
• Shito Motoaki

Classifications

• H02K9/19

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

• H02K9/227

  Heat sinks · CPC title

• H02K1/27

  Rotor cores with permanent magnets · CPC title

• H02K7/088

  radially supporting the rotor directly · CPC title

• H02K7/086

  radially supporting the rotor around a fixed spindle; radially supporting the rotor directly (H02K7/09 takes precedence) · CPC title