# US 12,003,139 B2 · Rotating electric machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,003,139 B2 - Document ID: US12003139B2 - Status: Granted - Kind: B2 - Application number: 17/411,304 - Filed: 2021-08-25 - Published: 2021-12-09 - Granted: 2024-06-04 - Earliest claimed: 2019-02-25 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Hiroyuki Tsuchiya; Shinji Koda; Yuki Takahashi; Kazuya Iwase; Akito Tamura - Web page: https://patentgrep.com/patent/US12003139B2 ## CPC - H02K 1/2766: {having a flux concentration effect} - H02K 1/278: Surface mounted magnets; Inset magnets - H02K 1/2791: Surface mounted magnets; Inset magnets - H02K 3/04: Windings characterised by the conductor shape, form or construction, e.g. with bar conductors - H02K 3/28: Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) - H02K 3/47: Air-gap windings, i.e. iron-free windings - H02K 5/1735: {radially supporting the rotary shaft at only one end of the rotor (H02K5/1737 takes precedence)} - H02K 5/20: with channels or ducts for flow of cooling medium - H02K 7/085: {radially supporting the rotary shaft at only one end of the rotor (H02K7/086, H02K7/09 take precedence)} - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - H02K 13/006: {Structural associations of commutators} - H02K 21/22: with magnets rotating around the armatures, e.g. flywheel magnetos - H02K 2203/03: Machines characterised by the wiring boards, i.e. printed circuit boards or similar structures for connecting the winding terminations - H02K 2203/09: Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations - H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract The rotating electric machine includes a stator having a stator winding and a rotor facing the stator in a radial direction. The rotor includes a carrier having a disk-shaped end plate section fixed to a rotating shaft and arranged coaxially with the rotating shaft, and an annular magnet unit arranged coaxially with the rotating shaft. The magnet has a cylindrical magnet holder whose one end in an axial direction is fixed to the end plate section, and a magnet fixed to a peripheral surface on a stator side in the radial direction in the magnet holder and having an alternating polarity in a circumferential direction. The magnet holder is made of a non-magnetic material. In the magnet, an orientation of an axis of easy magnetization on a q-axis is deviated from an orientation parallel to the q-axis. ## Claims ### Claim 1 A rotating electric machine comprising: a stator having a stator winding; and a rotor facing the stator in a radial direction, wherein the rotor includes: a carrier having a disk-shaped end plate section fixed to a rotating shaft and arranged coaxially with the rotating shaft; and an annular magnet unit arranged coaxially with the rotating shaft, the magnet unit includes a cylindrical magnet holder of which one end in an axial direction is fixed to the end plate section; and a magnet fixed to a peripheral surface on a stator side in the radial direction in the magnet holder and having an alternating polarity in a circumferential direction, the magnet holder is made of a non-magnetic material having a specific gravity smaller than a specific gravity of iron, in the magnet, an orientation of an axis of easy magnetization on a q-axis is deviated from an orientation parallel to the q-axis, the carrier is made of a magnetic material, the end plate section and the magnet are separated by a first distance in the axial direction, the stator has a cylindrical stator core assembled on an opposite-to-rotor side in the radial direction in the stator winding, and a second distance in the radial direction between the peripheral surface of the stator core on a side facing the rotor and the peripheral surface of the magnet on a side facing the stator is smaller than the first distance. ### Claim 2 (depends on 1) The rotating electric machine according to claim 1, wherein the magnet unit has an end plate fixed on both sides of the holder in the axial direction opposite to the carrier, and the end plate is made of a non-magnetic material. ### Claim 3 (depends on 2) The rotating electric machine according to claim 2, wherein the end plate is made of a non-magnetic material having a specific gravity greater than a specific gravity of the holder. ### Claim 4 (depends on 1) The rotating electric machine according to claim 1, wherein the rotor is arranged outside the stator in the radial direction, the magnet unit has a cylindrical outer holder fixed to an outer peripheral surface of the magnet holder, and a strength of the outer holder is higher than a strength of the magnet holder. ### Claim 5 (depends on 1) The rotating electric machine according to claim 1, wherein a thickness dimension in the radial direction of the magnet is equal to or less than an arc length of a magnetic flux transfer surface between d-q axes. ### Claim 6 (depends on 5) The rotating electric machine according to claim 5, wherein in the magnet, when an intersection of the q-axis and the magnetic flux transfer surface is a center point and a circle whose radius is a radial thickness dimension of the magnet is an orientation circle that defines the axis of easy magnetization of the magnet, the magnet covers a quarter circle of the orientation circle. ### Claim 7 (depends on 1) The rotating electric machine according to claim 1, wherein the magnet is oriented so as to have a linear axis of easy magnetization tilted with respect to a d-axis.