Variable electric motor system and electrically powered device

Patent metadata

Field	Value
Publication number	US-10177692-B2
Application number	US-201515320905-A
Country	US
Kind code	B2
Filing date	Jul 17, 2015
Priority date	Jul 18, 2014
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

This variable electric motor system comprises an electrically powered device and a planet gear transmission device. One of a sun gear shaft, a planet gear carrier shaft, and an internal gear carrier shaft of the planet gear transmission device constitutes an output shaft, another shaft constitutes a constant-speed input shaft, and the other shaft constitutes a variable-speed input shaft. The electrically powered device includes: a constant-speed electric motor including a constant-speed rotor that rotates about the axis, and that is connected to the constant-speed input shaft; and a variable-speed electric motor including a variable-speed rotor that rotates about the axis, and that is connected to the variable-speed input shaft. The variable-speed rotor has a shaft insertion hole formed therethrough in the axial direction, the shaft insertion hole having a cylindrical shape centered on the axis. The constant-speed rotor is inserted through the shaft insertion hole.

First claim

The invention claimed is:

1. A variable electric motor system comprising:
an electrically powered device that generates rotational driving force;
a transmission device that changes speed of the rotational driving force generated by the electrically powered device; and
a driving target that is driven by the rotational driving force from the electrically powered device,
the transmission device including:
a sun gear that rotates about an axis;
a sun gear shaft that is fixed to the sun gear and extends in an axial direction centered on the axis;
a planet gear that meshes with the sun gear, revolves around the axis, and rotates about its own center line;
an internal gear that has a plurality of teeth arranged in an annular shape centered on the axis, and meshes with the planet gear;
a planet gear carrier that has a planet gear carrier shaft extending in the axial direction centered on the axis, and supports the planet gear so as to allow the planet gear to revolve around the axis and to rotate about its own center line; and
an internal gear carrier that has an internal gear carrier shaft extending in the axis direction centered on the axis, and supports the internal gear so as to allow the internal gear to rotate about the axis,
one of the sun gear shaft, the planet gear carrier shaft, and the internal gear carrier shaft constituting an output shaft connected to a rotor of the driving target, one of the sun gear shaft, the planet gear carrier shaft, and the internal gear carrier shaft which is not the output shaft constituting a constant-speed input shaft, and one of the sun gear shaft, the planet gear carrier shaft, and the internal gear carrier shaft which is not the output shalt and the constant-speed input shaft constituting a variable-speed input shaft,
the electrically powered device including:
a constant-speed electric motor having a constant-speed rotor that rotates about the axis and is connected directly or indirectly to the constant-speed input shaft of the transmission device; and
a variable-speed electric motor having a variable-speed rotor that rotates about the axis and is connected directly or indirectly to the variable-speed input shaft of the transmission device;
of the variable-speed rotor and the constant-speed rotor, a first rotor having a shaft insertion hole formed therethrough in the axial direction, the shaft insertion hole having a cylindrical shape centered on the axis, and a second rotor being inserted through the shaft insertion hole of the first rotor, and
the rotor of the driving target being disposed on the axis, wherein
the planet gear carrier includes:
the planet gear carrier shaft;
a carrier main body that supports the planet gear so as to allow the planet gear to revolve around the axis and to rotate about its center line; and
a transmission portion that transmits rotation of the planet gear carrier shaft to the carrier main body, and
the transmission portion includes:
a carrier shaft gear formed on an outer peripheral surface of the planet gear carrier shaft:
a carrier main body gear formed on an outer peripheral surface of the carrier main body;
an idle gear that rotates by meshing with the carrier shaft gear; and
a transmission shaft gear that extends in the axial direction and meshes with the idle gear and the carrier main body gear.

2. The variable electric motor system according to claim 1 ,
wherein the variable-speed rotor is the first rotor;
the constant-speed rotor is divided into a constant-speed rotor main body shaft and a constant-speed rotor extension shaft that is inserted through the shaft insertion hole; and
the system further comprises a constant-speed flexible coupling that connects the constant-speed rotor main body shaft and the constant-speed rotor extension shaft.

3. The variable electric motor system according to claim 1 ,
wherein the variable-speed electric motor includes a variable-speed stator disposed on an outer peripheral side of the variable-speed rotor and a variable-speed electric motor casing having the variable-speed stator fixed to an inner peripheral side thereof;
the transmission device includes the sun gear, the sun gear shaft, the planet gear, the internal gear, the planet gear carrier shaft, the planet gear carrier, and the internal gear carrier, and a transmission casing that covers these components; and
the transmission casing is fixed to the variable-speed electric motor casing.

4. The variable electric motor system according to claim 3 ,
wherein the constant-speed electric motor includes a constant-speed stator disposed on an outer peripheral side of the constant-speed rotor, and a constant-speed electric motor casing having the constant-speed stator fixed to an inner peripheral side thereof; and
the system further comprises an electrically powered device support portion that supports the constant-speed electric motor casing.

5. The variable electric motor system according to claim 4 , further comprising a variable-speed electric motor support portion that supports the variable-speed electric motor casing.

6. The variable electric motor system according to claim 4 , further comprising a transmission device support portion that supports the transmission casing.

7. The variable electric motor system according to claim 4 ,
wherein the transmission casing is fixed to the variable-speed electric motor casing.

8. The variable electric motor system according to claim 1 ,
wherein the variable-speed electric motor and the transmission device are supported by a shared frame.

9. The variable electric motor system according to claim 8 ,
wherein the variable-speed rotor is the first rotor, and
the system further comprises:
a constant-speed flexible coupling that connects the constant-speed rotor and the constant-speed input shaft; and
a gear coupling that connects the variable-speed rotor and the variable-speed input shaft.

10. The variable electric motor system according to claim 8 ,
wherein the variable-speed rotor is the first rotor;
the system further comprises a gear coupling that connects the variable-speed rotor and the variable-speed input shaft; and
the constant-speed rotor and the constant-speed input shaft are connected via flanges formed in the constant-speed rotor and the constant-speed input shaft, or are integrated.

11. The variable electric motor system according to claim 9 ,
wherein tooth trace correction is carried out on gears constituting the gear coupling.

12. The variable electric motor system according to claim 8 ,
wherein the variable-speed rotor is the first rotor;
the system further comprises:
a constant-speed flexible coupling that connects the constant-speed rotor and the constant-speed input shaft; and
a damper coupling that connects the variable-speed rotor and the variable-speed input shaft, and
the damper coupling includes:
a damper coupling first portion fixed to the variable-speed rotor;
a damper coupling second portion fixed to the variable-speed input shaft;
a claw portion provided in at least one of the damper coupling first portion and the damper coupling second portion;
a damper rubber that covers the claw portion; and
a claw housing hole provided in at least one of the damper coupling first portion and the damper coupling second portion, the claw portion covered by the damper rubber fitting into the claw housing hole.

13. The variable electric motor system according to claim 1 , further comprising:
a constant-speed flexible coupling that connects the constant-speed rotor and the constant-speed input shaft; and
a variable-speed flexible coupling that connects the variable

Assignees

• Mitsubishi Heavy Ind Compressor Corp

Inventors

• Kobayashi Masahiro
• Okamoto Yoshiyuki
• Mori Yasushi

Classifications

• H02K7/003

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title

• H02K16/00

  Machines with more than one rotor or stator {(machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029)} · CPC title

• F16H3/724

  using externally powered electric machines · CPC title

• H02P6/10

  Arrangements for controlling torque ripple, e.g. providing reduced torque ripple · CPC title

• H02K9/06

  with fans or impellers driven by the machine shaft · CPC title