US 12,266,993 B2
Motor unit
Toshiya Okamoto, Kyoto (JP); Yoshiaki Yamashita, Kyoto (JP); and Takashi Hattori, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Appl. No. 17/761,619
Filed by Nidec Corporation, Kyoto (JP)
PCT Filed Sep. 14, 2020, PCT No. PCT/JP2020/034776
§ 371(c)(1), (2) Date Mar. 18, 2022,
PCT Pub. No. WO2021/065452, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 2019-179714 (JP), filed on Sep. 30, 2019.
Prior Publication US 2022/0376582 A1, Nov. 24, 2022
Int. Cl. H02K 5/10 (2006.01); H02K 5/22 (2006.01)
CPC H02K 5/10 (2013.01) [H02K 5/225 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A motor assembly comprising:
a housing;
a first substrate;
a second substrate; and
a cover; wherein
the housing is defined by a single monolithic structure which includes:
a tubular portion that accommodates a motor whose axis of rotation extends in a vertical direction; and
an upper wall portion which extends axially out from an axial end of the tubular portion and is provided with an accommodating chamber which accommodates the second substrate, a total length of the upper wall portion in the vertical direction is greater than a total length of the upper wall portion in a radial direction;
the first substrate opposes a radial outer end surface of the tubular portion in the radial direction;
the second substrate extends perpendicularly to an axial direction and is above the motor;
the cover includes:
a first cover portion that covers a radial outer end surface of the first substrate; and
a second cover portion that covers an upper surface of the second substrate;
an outer edge of the first cover portion as viewed from the radial direction and an outer edge of the second cover portion as viewed from the axial direction are in contact with the housing via a seal; and
the first cover is located radially outward from the upper wall portion and the second cover is located axially outward from the upper wall portion.