Rotary electric machine

Patent metadata

Field	Value
Publication number	US-2023299625-A1
Application number	US-202318321969-A
Country	US
Kind code	A1
Filing date	May 23, 2023
Priority date	Nov 27, 2020
Publication date	Sep 21, 2023
Grant date	—

Abstract

A rotary electric machine includes a rotor including a plurality of magnetic poles, a stator including a multi-phase stator winding, a power line that supplies power to the stator winding, and a rotation sensor that detects a rotational position of the rotor. The stator and the rotor face each other on the inner side and the outer side in the radial direction. The power line and a signal line that extends from the rotation sensor are provided so as to extend in the axial direction. Blocking portions that block an electromagnetic field generated by the power line are each interposed between the power line and the signal line.

First claim

What is claimed is:

1 . A rotary electric machine comprising:
a rotor including a plurality of magnetic poles; a stator including a stator winding that is multi-phase; a power line configured to supply power to the stator winding; and a rotation sensor configured to detect a rotational position of the rotor, wherein the stator and the rotor face each other in a radial direction, the power line and a signal line, which extends from the rotation sensor, extend in an axial direction, and a blocking portion is interposed between the power line and the signal line and configured to block an electromagnetic field generated by the power line.

2 . The rotary electric machine according to claim 1 , further comprising:
a stator holder in a cylindrical shape and assembled inside the stator in the radial direction, wherein the rotary electric machine is an outer-rotor type rotary electric machine including the rotor outside the stator in the radial direction, the stator holder includes a hollow portion and a protrusion in the hollow portion, the protrusion is provided as a fixing portion and protrudes inward in the radial direction for fixing the rotation sensor, and the protrusion is the blocking portion.

3 . The rotary electric machine according to claim 2 , wherein
the protrusion is provided in the hollow portion of the stator holder, the protrusion extends in the axial direction in a range from one end of the stator holder in the axial direction to an intermediate position of the stator holder in the axial direction, the rotation sensor is fixed to an end surface of the protrusion in the axial direction, and the signal line extends in the axial direction along the protrusion.

4 . The rotary electric machine according to claim 3 , wherein
the protrusion is provided in the hollow portion of the stator holder in the range from the one end of the stator holder in the axial direction to the intermediate position of the stator holder in the axial direction, and a part of a rotary object including the rotor is received in a range from the intermediate position of the stator holder in the axial direction to an other end of the stator holder in the axial direction.

5 . The rotary electric machine according to claim 2 , wherein
in the hollow portion of the stator holder, the power line is connected to the stator winding of each phase on one end side of the stator in the axial direction, and extends from the one end side of the stator to an other end side of the stator in the axial direction, and the protrusion is provided between the power line and the signal line.

6 . The rotary electric machine according to claim 2 , wherein
the rotor includes a rotor carrier including an end plate portion on one end side in the axial direction and having an opening on an other end side in the axial direction of the rotor carrier, the stator is inserted inside the rotor carrier in the radial direction from the other end side of the rotor carrier having the opening, the stator winding includes a plurality of winding segments for each multi-phase winding, each of the winding segments includes a pair of intermediate conductor portions and link portions at both ends of the pair of intermediate conductor portions in the axial direction, the pair of intermediate conductor portions and the link portions are in an annular arrangement, the winding segments include a first winding segment and a second winding segment, one end side of the stator winding of the first winding segment in the axial direction is bent inward in the radial direction, an other end side of the stator winding of the second winding segment in the axial direction is bent outward in the radial direction, the first winding segment and the second winding segment are provided side by side and partially overlap each other in a circumferential direction, a bent side of the first winding segment and a non-bent side of the second winding segment are on a side of the end plate portion of the rotor carrier, a wiring module is provided on the side of the end plate portion of the rotor carrier among both ends of the stator winding in the axial direction and electrically connected to each of the winding segments, the power line is connected to the wiring module, in the hollow portion of the stator holder, the power line extends from one end side of the stator to an other end side of the stator in the axial direction, and the protrusion is provided between the power line and the signal line.

7 . The rotary electric machine according to claim 2 , wherein
a shaft body is provided in the hollow portion of the stator holder to pivotally support a rotary object including the rotor, the protrusion protrudes toward the shaft body in the stator holder, and in the hollow portion of the stator holder, the protrusion and the shaft body are the blocking portion.

8 . The rotary electric machine according to claim 7 , wherein
the shaft body includes a stationary shaft inserted through the hollow portion of the stator holder and a diameter-expanded portion larger in diameter than the stationary shaft, the diameter-expanded portion includes a first insertion hole and a second insertion hole, both the first insertion hole and the second insertion hole extend from an end surface of the diameter-expanded portion in the axial direction that is on a side of the hollow portion of the stator holder to pass through the diameter-expanded portion in the axial direction, the power line is inserted through the first insertion hole, and the signal line is inserted through the second insertion hole.

9 . The rotary electric machine according to claim 8 , wherein
the shaft body is formed of a magnetic material.

10 . The rotary electric machine according to claim 7 , wherein
the stator holder includes
a coolant path extending in an annular shape in a circumferential direction to circulate a coolant in the circumferential direction,
an inlet path, as an inlet of the coolant to the coolant path, extending in the axial direction, and
an outlet path, as an outlet of the coolant from the coolant path, extending in the axial direction,
the shaft body includes a stationary shaft inserted through the hollow portion of the stator holder and a diameter-expanded portion larger in diameter than the stationary shaft, the diameter-expanded portion has two shaft body coolant passages extending in the axial direction and respectively communicating with the inlet path and the outlet path, the diameter-expanded portion includes a power line insertion hole extending in the axial direction and through which the power line is inserted, and the two shaft body coolant passages are provided at positions 90° or more away from the power line insertion hole in the circumferential direction.

11 . The rotary electric machine according to claim 2 , wherein
the rotary electric machine is to be used in a direction where the axial direction is directed along a horizontal direction or a substantially horizontal direction, the stator holder includes
a coolant path extending in an annular shape in a circumferential direction to circulate a coolant in the circumferential direction,
an inlet path, as an inlet of the coolant to the coolant path, extending in the axial direction, and
an outlet path, as an outlet of the coolant from the coolant path, extending in the axial direction,
in the coolant path, a path inlet, which communicates with the inlet path, and a path outlet, which communicates with the outlet path, are provided at positions where an angle with respect to a vertically upward direction is 45° or near 45°, and the coolant path

Assignees

• Denso Corp

Inventors

• Tsuchiya Hiroyuki
• Okada Shinichi
• Koda Shinji
• Tamura Akito
• Mawatari Yuki

Classifications

• H02K1/20 Primary

  with channels or ducts for flow of cooling medium · CPC title

• H02K1/187

  to inner stators · CPC title

• H02K1/2786

  Outer rotors · CPC title

• H02K7/003

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

• H02K21/22 Primary

  with magnets rotating around the armatures, e.g. flywheel magnetos · CPC title