US 12,424,903 B2
Marine propeller system with high torque drive
Thomas F. Janecek, Flagstaff, AZ (US); Jeremy Scott Reynolds, Flagstaff, AZ (US); Robert J. Lind, Robbinsdale, MN (US); Timothy S. Roman, Minnetonka, MN (US); and Tyler K. Williams, Flagstaff, AZ (US)
Assigned to Graco Minnesota Inc., Minneapolis, MN (US)
Filed by Electric Torque Machines, Inc., Minneapolis, MN (US)
Filed on Nov. 3, 2023, as Appl. No. 18/386,818.
Application 18/386,818 is a continuation of application No. 18/125,592, filed on Mar. 23, 2023, granted, now 11,831,222.
Application 18/125,592 is a continuation of application No. 17/972,966, filed on Oct. 25, 2022, granted, now 11,646,635, issued on May 9, 2023.
Application 17/972,966 is a continuation of application No. PCT/US2021/051248, filed on Sep. 21, 2021.
Claims priority of provisional application 63/220,376, filed on Jul. 9, 2021.
Claims priority of provisional application 63/082,995, filed on Sep. 24, 2020.
Prior Publication US 2024/0079929 A1, Mar. 7, 2024
Int. Cl. H02K 7/14 (2006.01); B63H 1/14 (2006.01); B63H 21/17 (2006.01); B63H 23/34 (2006.01); H02K 1/16 (2006.01); H02K 1/22 (2006.01); H02K 7/00 (2006.01)
CPC H02K 7/14 (2013.01) [B63H 1/14 (2013.01); B63H 21/17 (2013.01); B63H 23/34 (2013.01); H02K 1/16 (2013.01); H02K 1/22 (2013.01); H02K 7/003 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A marine propulsion apparatus comprising:
a motor housing;
a propeller configured to be rotated on an axis and disposed outside of the motor housing;
a drive shaft coaxial with the axis and connected to the propeller to drive rotation of the propeller coaxially with the axis, the drive shaft extending from within the motor housing to outside of the motor housing;
a rotor configured to rotate coaxial with the axis, the drive shaft connected to the rotor to be rotated coaxial with the axis by the rotor;
a stator disposed within the motor housing and configured to be electrically energized to generate magnetic flux that causes the rotor to rotate, the stator comprising at least one coil disposed within the motor housing; and
a seal assembly extending around the drive shaft to form a seal with the drive shaft, the seal assembly separating a dry interior of the motor housing from a wet exterior of the motor housing, wherein the seal assembly is disposed axially between the propeller and the rotor;
wherein the seal assembly is disposed axially closer to the propeller than any bearing of the marine propulsion apparatus.